Mercurial Hosting > luan
annotate core/src/luan/impl/LuanParser.java @ 191:2456ef7ada02
minor
git-svn-id: https://luan-java.googlecode.com/svn/trunk@192 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Tue, 01 Jul 2014 06:40:48 +0000 |
parents | 04b86428dc50 |
children | 66ed8886abc0 |
rev | line source |
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166
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1 package luan.impl; |
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2 |
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3 import java.util.Set; |
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4 import java.util.HashSet; |
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5 import java.util.Arrays; |
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6 import java.util.List; |
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7 import java.util.ArrayList; |
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8 import java.util.Scanner; |
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9 import luan.Luan; |
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10 import luan.LuanState; |
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11 import luan.LuanSource; |
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12 import luan.modules.PackageLuan; |
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13 |
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14 |
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15 final class LuanParser { |
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16 |
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17 private static final class Frame { |
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18 final Frame parent; |
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19 final List<String> symbols = new ArrayList<String>(); |
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20 int stackSize = 0; |
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21 int loops = 0; |
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22 boolean isVarArg = false; |
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23 final List<String> upValueSymbols = new ArrayList<String>(); |
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24 final List<UpValue.Getter> upValueGetters = new ArrayList<UpValue.Getter>(); |
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25 |
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26 Frame(UpValue.Getter envGetter) { |
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27 this.parent = null; |
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28 upValueSymbols.add(_ENV); |
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29 upValueGetters.add(envGetter); |
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30 } |
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31 |
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32 Frame(Frame parent) { |
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33 this.parent = parent; |
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34 if( upValueIndex(_ENV) != 0 ) |
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35 throw new RuntimeException(); |
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36 } |
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37 |
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38 int stackIndex(String name) { |
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39 int i = symbols.size(); |
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40 while( --i >= 0 ) { |
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41 if( symbols.get(i).equals(name) ) |
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42 return i; |
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43 } |
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44 return -1; |
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45 } |
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46 |
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47 int upValueIndex(String name) { |
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48 int i = upValueSymbols.size(); |
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49 while( --i >= 0 ) { |
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50 if( upValueSymbols.get(i).equals(name) ) |
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51 return i; |
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52 } |
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53 if( parent==null ) |
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54 return -1; |
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55 i = parent.stackIndex(name); |
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56 if( i != -1 ) { |
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57 upValueGetters.add(new UpValue.StackGetter(i)); |
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58 } else { |
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59 i = parent.upValueIndex(name); |
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60 if( i == -1 ) |
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61 return -1; |
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62 upValueGetters.add(new UpValue.NestedGetter(i)); |
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63 } |
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64 upValueSymbols.add(name); |
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65 return upValueSymbols.size() - 1; |
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66 } |
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67 |
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68 void addUpValueGetter(String name,UpValue.Getter upValueGetter) { |
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69 upValueSymbols.add(name); |
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70 upValueGetters.add(upValueGetter); |
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71 } |
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72 } |
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73 |
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74 private static class In { |
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75 static final In NOTHING = new In(false,false); |
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76 |
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77 final boolean parens; |
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78 final boolean template; |
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79 |
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80 private In(boolean parens,boolean template) { |
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81 this.parens = parens; |
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82 this.template = template; |
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83 } |
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84 |
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85 In parens() { |
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86 return parens ? this : new In(true,template); |
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87 } |
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88 |
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89 In template() { |
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90 return template ? this : new In(parens,true); |
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91 } |
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92 } |
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93 |
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94 private static final String _ENV = "_ENV"; |
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95 private static final UpValue.Getter[] NO_UP_VALUE_GETTERS = new UpValue.Getter[0]; |
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96 |
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97 final LuanSource source; |
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98 private Frame frame; |
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99 private final Parser parser; |
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100 private final boolean interactive; |
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101 |
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102 LuanParser(LuanSource source,UpValue.Getter envGetter) { |
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103 this.source = source; |
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104 this.frame = new Frame(envGetter); |
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105 this.parser = new Parser(source); |
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106 this.interactive = envGetter instanceof UpValue.ValueGetter; |
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107 } |
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108 |
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109 void addVar(String name,Object value) { |
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110 frame.addUpValueGetter(name,new UpValue.ValueGetter(value)); |
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111 } |
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112 |
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113 private LuanSource.Element se(int start) { |
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114 return se(start,null); |
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115 } |
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116 |
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117 private LuanSource.Element se(int start,String text) { |
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118 return new LuanSource.Element(source,start,parser.currentIndex(),text); |
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119 } |
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120 |
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121 private List<String> symbols() { |
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122 return frame.symbols; |
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123 } |
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124 |
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125 private int symbolsSize() { |
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126 return frame.symbols.size(); |
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127 } |
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128 |
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129 private void addSymbol(String name) { |
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130 frame.symbols.add(name); |
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131 if( frame.stackSize < symbolsSize() ) |
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132 frame.stackSize = symbolsSize(); |
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133 } |
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134 |
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135 private void addSymbols(List<String> names) { |
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136 frame.symbols.addAll(names); |
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137 if( frame.stackSize < symbolsSize() ) |
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138 frame.stackSize = symbolsSize(); |
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139 } |
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140 |
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141 private int stackIndex(String name) { |
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142 return frame.stackIndex(name); |
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143 } |
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144 |
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145 private void popSymbols(int n) { |
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146 List<String> symbols = frame.symbols; |
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147 while( n-- > 0 ) { |
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148 symbols.remove(symbols.size()-1); |
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149 } |
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150 } |
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151 |
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152 private int upValueIndex(String name) { |
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153 return frame.upValueIndex(name); |
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154 } |
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155 |
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156 private void incLoops() { |
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157 frame.loops++; |
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158 } |
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159 |
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160 private void decLoops() { |
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161 frame.loops--; |
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162 } |
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163 |
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164 private <T> T required(T t) throws ParseException { |
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165 if( t==null ) |
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166 throw parser.exception(); |
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167 return t; |
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168 } |
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169 |
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170 private <T> T required(T t,String msg) throws ParseException { |
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171 if( t==null ) |
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172 throw parser.exception(msg); |
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173 return t; |
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174 } |
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175 |
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176 private static Expr expr(Expressions exprs) { |
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177 if( exprs instanceof Expr ) |
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178 return (Expr)exprs; |
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179 return new ExpressionsExpr(exprs); |
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180 } |
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181 |
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182 private FnDef newFnDef(int start,Stmt stmt) { |
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183 return new FnDef( se(start), stmt, frame.stackSize, symbolsSize(), frame.isVarArg, frame.upValueGetters.toArray(NO_UP_VALUE_GETTERS) ); |
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184 } |
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185 |
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186 FnDef Expression() throws ParseException { |
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187 Spaces(In.NOTHING); |
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188 int start = parser.begin(); |
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189 Expressions expr = Expr(In.NOTHING); |
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190 if( expr != null && parser.endOfInput() ) { |
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191 Stmt stmt = new ReturnStmt( se(start), expr ); |
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192 return parser.success(newFnDef(start,stmt)); |
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193 } |
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194 return parser.failure(null); |
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195 } |
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196 |
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197 FnDef RequiredModule() throws ParseException { |
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198 Spaces(In.NOTHING); |
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199 int start = parser.begin(); |
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200 frame.isVarArg = true; |
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201 Stmt stmt = RequiredBlock(); |
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202 if( parser.endOfInput() ) |
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203 return parser.success(newFnDef(start,stmt)); |
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204 throw parser.exception(); |
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205 } |
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206 |
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207 private Stmt RequiredBlock() throws ParseException { |
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208 List<Stmt> stmts = new ArrayList<Stmt>(); |
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209 int stackStart = symbolsSize(); |
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210 Stmt(stmts); |
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211 while( StmtSep(stmts) ) { |
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212 Spaces(In.NOTHING); |
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213 Stmt(stmts); |
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214 } |
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215 int stackEnd = symbolsSize(); |
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216 popSymbols( stackEnd - stackStart ); |
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217 if( stmts.isEmpty() ) |
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218 return Stmt.EMPTY; |
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219 if( stmts.size()==1 && stackStart==stackEnd ) |
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220 return stmts.get(0); |
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221 return new Block( stmts.toArray(new Stmt[0]), stackStart, stackEnd ); |
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222 } |
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223 |
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224 private boolean StmtSep(List<Stmt> stmts) throws ParseException { |
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225 parser.begin(); |
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226 if( parser.match( ';' ) ) |
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227 return parser.success(); |
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228 if( parser.match( "--" ) ) { |
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229 while( parser.noneOf("\r\n") ); |
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230 } |
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231 if( EndOfLine() ) |
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232 return parser.success(); |
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233 parser.rollback(); |
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234 Stmt stmt = TemplateStmt(); |
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235 if( stmt != null ) { |
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236 stmts.add(stmt); |
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237 return parser.success(); |
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238 } |
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239 return parser.failure(); |
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240 } |
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241 |
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242 private boolean EndOfLine() { |
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243 return parser.match( "\r\n" ) || parser.match( '\r' ) || parser.match( '\n' ); |
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244 } |
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245 |
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246 private void Stmt(List<Stmt> stmts) throws ParseException { |
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247 if( LocalStmt(stmts) ) |
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248 return; |
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249 Stmt stmt; |
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250 if( (stmt=ReturnStmt()) != null |
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251 || (stmt=FunctionStmt()) != null |
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252 || (stmt=LocalFunctionStmt()) != null |
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253 || (stmt=ImportStmt()) != null |
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254 || (stmt=BreakStmt()) != null |
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255 || (stmt=ForStmt()) != null |
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256 || (stmt=TryStmt()) != null |
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257 || (stmt=DoStmt()) != null |
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258 || (stmt=WhileStmt()) != null |
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259 || (stmt=FunctionStmt()) != null |
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260 || (stmt=RepeatStmt()) != null |
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261 || (stmt=IfStmt()) != null |
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262 || (stmt=SetStmt()) != null |
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263 || (stmt=ExpressionsStmt()) != null |
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264 ) { |
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265 stmts.add(stmt); |
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266 } |
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267 } |
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268 |
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269 private Stmt TemplateStmt() throws ParseException { |
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270 int start = parser.currentIndex(); |
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271 Expressions exp = TemplateExpressions(In.NOTHING); |
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272 if( exp == null ) |
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273 return null; |
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274 Expr fnExp = (Expr)nameVar(start,"Io").expr(); |
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275 fnExp = new IndexExpr( se(start,"stdout"), fnExp, new ConstExpr("stdout") ); |
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276 fnExp = new IndexExpr( se(start,"write"), fnExp, new ConstExpr("write") ); |
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277 FnCall fnCall = new FnCall( se(start), fnExp, exp ); |
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278 return new ExpressionsStmt(fnCall); |
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279 } |
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280 |
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281 private Expressions TemplateExpressions(In in) throws ParseException { |
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282 if( in.template ) |
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283 return null; |
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284 int start = parser.begin(); |
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285 if( !parser.match( "%>" ) ) |
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286 return parser.failure(null); |
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287 EndOfLine(); |
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288 In inTemplate = in.template(); |
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289 List<Expressions> builder = new ArrayList<Expressions>(); |
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290 while(true) { |
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291 if( parser.match( "<%=" ) ) { |
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292 Spaces(inTemplate); |
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293 builder.add( RequiredExpr(inTemplate) ); |
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294 RequiredMatch( "%>" ); |
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295 } else if( parser.match( "<%" ) ) { |
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296 Spaces(inTemplate); |
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297 return parser.success(ExpList.build(builder)); |
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298 } else { |
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299 int i = parser.currentIndex(); |
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300 do { |
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301 if( parser.match( "%>" ) ) |
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302 throw parser.exception("'%>' unexpected"); |
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303 if( !parser.anyChar() ) |
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304 throw parser.exception("Unclosed template expression"); |
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305 } while( !parser.test( "<%" ) ); |
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306 String match = parser.textFrom(i); |
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307 builder.add( new ConstExpr(match) ); |
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308 } |
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309 } |
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310 } |
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311 |
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312 private Stmt ReturnStmt() throws ParseException { |
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313 int start = parser.begin(); |
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314 if( !Keyword("return",In.NOTHING) ) |
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315 return parser.failure(null); |
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316 Expressions exprs = ExpList(In.NOTHING); |
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317 if( exprs==null ) |
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318 exprs = ExpList.emptyExpList; |
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319 return parser.success( new ReturnStmt(se(start),exprs) ); |
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320 } |
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321 |
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322 private Stmt FunctionStmt() throws ParseException { |
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323 parser.begin(); |
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324 if( !Keyword("function",In.NOTHING) ) |
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325 return parser.failure(null); |
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326 |
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327 int start = parser.currentIndex(); |
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328 Var var = nameVar(start,RequiredName(In.NOTHING)); |
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329 while( parser.match( '.' ) ) { |
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330 Spaces(In.NOTHING); |
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331 var = indexVar( start, expr(var.expr()), NameExpr(In.NOTHING) ); |
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332 } |
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333 Settable fnName = var.settable(); |
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334 |
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335 FnDef fnDef = RequiredFunction(In.NOTHING); |
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336 return parser.success( new SetStmt(fnName,fnDef) ); |
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337 } |
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338 |
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339 private Stmt LocalFunctionStmt() throws ParseException { |
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340 parser.begin(); |
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341 if( !(Keyword("local",In.NOTHING) && Keyword("function",In.NOTHING)) ) |
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342 return parser.failure(null); |
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343 String name = RequiredName(In.NOTHING); |
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344 addSymbol( name ); |
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345 FnDef fnDef = RequiredFunction(In.NOTHING); |
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346 return parser.success( new SetStmt( new SetLocalVar(symbolsSize()-1), fnDef ) ); |
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347 } |
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348 |
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349 private Stmt ImportStmt() throws ParseException { |
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350 int start = parser.begin(); |
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351 if( !Keyword("import",In.NOTHING) ) |
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352 return parser.failure(null); |
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353 String modName = StringLiteral(In.NOTHING); |
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354 if( modName==null ) |
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355 return parser.failure(null); |
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356 int i = modName.lastIndexOf('/'); |
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357 if( i == -1 ) |
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358 i = modName.lastIndexOf('.'); |
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359 String varName = modName.substring(i+1); |
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360 if( !isValidName(varName) ) |
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361 throw parser.exception("invalid variable name '"+varName+"' in import"); |
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362 LuanSource.Element se = se(start); |
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363 FnCall require = new FnCall( se, new ConstExpr(se,PackageLuan.requireFn), new ConstExpr(modName) ); |
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364 Settable settable; |
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365 if( interactive ) { |
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366 settable = nameVar(se,varName).settable(); |
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367 } else { |
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368 addSymbol( varName ); |
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369 settable = new SetLocalVar(symbolsSize()-1); |
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370 } |
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371 return parser.success( new SetStmt( settable, expr(require) ) ); |
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372 } |
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373 |
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374 private boolean isValidName(String s) { |
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375 if( s.length() == 0 ) |
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376 return false; |
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377 char c = s.charAt(0); |
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378 if( !('a'<=c && c<='z' || 'A'<=c && c<='Z' || c=='_') ) |
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379 return false; |
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380 for( int i=1; i<s.length() ; i++ ) { |
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381 if( !('a'<=c && c<='z' || 'A'<=c && c<='Z' || c=='_' || '0'<=c && c<='9') ) |
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382 return false; |
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383 } |
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384 return true; |
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385 } |
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386 |
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387 private Stmt BreakStmt() throws ParseException { |
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388 parser.begin(); |
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389 if( !Keyword("break",In.NOTHING) ) |
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390 return parser.failure(null); |
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391 if( frame.loops <= 0 ) |
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392 throw parser.exception("'break' outside of loop"); |
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393 return parser.success( new BreakStmt() ); |
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394 } |
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395 |
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396 private Stmt ForStmt() throws ParseException { |
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397 int start = parser.begin(); |
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398 int stackStart = symbolsSize(); |
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399 if( !Keyword("for",In.NOTHING) ) |
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400 return parser.failure(null); |
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401 List<String> names = RequiredNameList(In.NOTHING); |
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402 if( !Keyword("in",In.NOTHING) ) |
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403 return parser.failure(null); |
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404 Expr expr = expr(RequiredExpr(In.NOTHING)); |
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405 RequiredKeyword("do",In.NOTHING); |
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406 addSymbols(names); |
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407 Stmt loop = RequiredLoopBlock(); |
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408 RequiredKeyword("end",In.NOTHING); |
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409 Stmt stmt = new ForStmt( se(start), stackStart, symbolsSize() - stackStart, expr, loop ); |
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410 popSymbols( symbolsSize() - stackStart ); |
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411 return parser.success(stmt); |
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412 } |
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413 |
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414 private Stmt TryStmt() throws ParseException { |
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415 parser.begin(); |
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416 if( !Keyword("try",In.NOTHING) ) |
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417 return parser.failure(null); |
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418 Stmt tryBlock = RequiredBlock(); |
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419 RequiredKeyword("catch",In.NOTHING); |
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420 String name = RequiredName(In.NOTHING); |
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421 addSymbol(name); |
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422 RequiredKeyword("do",In.NOTHING); |
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423 Stmt catchBlock = RequiredBlock(); |
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424 RequiredKeyword("end",In.NOTHING); |
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425 Stmt stmt = new TryStmt( tryBlock, symbolsSize()-1, catchBlock ); |
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426 popSymbols(1); |
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427 return parser.success(stmt); |
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428 } |
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429 |
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430 private Stmt DoStmt() throws ParseException { |
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431 parser.begin(); |
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432 if( !Keyword("do",In.NOTHING) ) |
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433 return parser.failure(null); |
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434 Stmt stmt = RequiredBlock(); |
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435 RequiredKeyword("end",In.NOTHING); |
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436 return parser.success(stmt); |
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437 } |
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438 |
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439 private boolean LocalStmt(List<Stmt> stmts) throws ParseException { |
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440 parser.begin(); |
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441 if( !Keyword("local",In.NOTHING) ) |
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442 return parser.failure(); |
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443 List<String> names = NameList(In.NOTHING); |
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444 if( names==null ) |
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445 return parser.failure(); |
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446 if( parser.match( '=' ) ) { |
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447 Spaces(In.NOTHING); |
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448 Expressions values = ExpList(In.NOTHING); |
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449 if( values==null ) |
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450 throw parser.exception("Expressions expected"); |
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451 SetLocalVar[] vars = new SetLocalVar[names.size()]; |
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452 int stackStart = symbolsSize(); |
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453 for( int i=0; i<vars.length; i++ ) { |
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454 vars[i] = new SetLocalVar(stackStart+i); |
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455 } |
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456 stmts.add( new SetStmt( vars, values ) ); |
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457 } |
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458 addSymbols(names); |
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459 return parser.success(); |
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460 } |
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461 |
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462 private List<String> RequiredNameList(In in) throws ParseException { |
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463 parser.begin(); |
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464 List<String> names = NameList(in); |
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465 if( names==null ) |
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466 throw parser.exception("Name expected"); |
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467 return parser.success(names); |
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468 } |
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469 |
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470 private List<String> NameList(In in) throws ParseException { |
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471 String name = Name(in); |
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472 if( name==null ) |
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473 return null; |
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474 List<String> names = new ArrayList<String>(); |
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475 names.add(name); |
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476 while( (name=anotherName(in)) != null ) { |
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477 names.add(name); |
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478 } |
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479 return names; |
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480 } |
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481 |
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482 private String anotherName(In in) throws ParseException { |
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483 parser.begin(); |
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484 if( !parser.match( ',' ) ) |
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485 return parser.failure(null); |
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486 Spaces(in); |
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487 String name = Name(in); |
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488 if( name==null ) |
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489 return parser.failure(null); |
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490 return parser.success(name); |
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491 } |
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492 |
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493 private Stmt WhileStmt() throws ParseException { |
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494 int start = parser.begin(); |
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495 if( !Keyword("while",In.NOTHING) ) |
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496 return parser.failure(null); |
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497 Expr cnd = expr(RequiredExpr(In.NOTHING)); |
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498 RequiredKeyword("do",In.NOTHING); |
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499 Stmt loop = RequiredLoopBlock(); |
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500 RequiredKeyword("end",In.NOTHING); |
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501 return parser.success( new WhileStmt(se(start),cnd,loop) ); |
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502 } |
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503 |
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504 private Stmt RepeatStmt() throws ParseException { |
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505 int start = parser.begin(); |
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506 if( !Keyword("repeat",In.NOTHING) ) |
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507 return parser.failure(null); |
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508 Stmt loop = RequiredLoopBlock(); |
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509 RequiredKeyword("until",In.NOTHING); |
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510 Expr cnd = expr(RequiredExpr(In.NOTHING)); |
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511 return parser.success( new RepeatStmt(se(start),loop,cnd) ); |
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512 } |
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513 |
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514 private Stmt RequiredLoopBlock() throws ParseException { |
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515 incLoops(); |
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516 Stmt stmt = RequiredBlock(); |
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517 decLoops(); |
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518 return stmt; |
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519 } |
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520 |
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521 private Stmt IfStmt() throws ParseException { |
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522 parser.begin(); |
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523 if( !Keyword("if",In.NOTHING) ) |
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524 return parser.failure(null); |
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525 return parser.success( IfStmt2() ); |
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526 } |
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527 |
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528 private Stmt IfStmt2() throws ParseException { |
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529 int start = parser.currentIndex(); |
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530 Expr cnd = expr(RequiredExpr(In.NOTHING)); |
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531 RequiredKeyword("then",In.NOTHING); |
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532 Stmt thenBlock = RequiredBlock(); |
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533 Stmt elseBlock; |
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534 if( Keyword("elseif",In.NOTHING) ) { |
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535 elseBlock = IfStmt2(); |
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536 } else { |
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537 elseBlock = Keyword("else",In.NOTHING) ? RequiredBlock() : Stmt.EMPTY; |
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538 RequiredKeyword("end",In.NOTHING); |
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539 } |
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540 return new IfStmt(se(start),cnd,thenBlock,elseBlock); |
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541 } |
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542 |
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543 private Stmt SetStmt() throws ParseException { |
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544 parser.begin(); |
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545 List<Settable> vars = new ArrayList<Settable>(); |
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546 Settable s = SettableVar(); |
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547 if( s == null ) |
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548 return parser.failure(null); |
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549 vars.add(s); |
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550 while( parser.match( ',' ) ) { |
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551 Spaces(In.NOTHING); |
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552 s = SettableVar(); |
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553 if( s == null ) |
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554 return parser.failure(null); |
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555 vars.add(s); |
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556 } |
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557 if( !parser.match( '=' ) ) |
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558 return parser.failure(null); |
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559 Spaces(In.NOTHING); |
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560 Expressions values = ExpList(In.NOTHING); |
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561 if( values==null ) |
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562 throw parser.exception("Expressions expected"); |
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563 return parser.success( new SetStmt( vars.toArray(new Settable[0]), values ) ); |
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564 } |
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565 |
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566 private Stmt ExpressionsStmt() throws ParseException { |
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567 parser.begin(); |
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568 Expressions exp = Expr(In.NOTHING); |
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569 if( exp instanceof FnCall || exp instanceof AndExpr || exp instanceof OrExpr ) |
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570 return parser.success( new ExpressionsStmt(exp) ); |
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571 return parser.failure(null); |
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572 } |
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573 |
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574 private Settable SettableVar() throws ParseException { |
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575 int start = parser.begin(); |
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576 Var var = VarZ(In.NOTHING); |
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577 if( var==null ) |
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578 return parser.failure(null); |
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579 return parser.success( var.settable() ); |
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580 } |
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581 |
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582 private Expressions RequiredExpr(In in) throws ParseException { |
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583 parser.begin(); |
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584 return parser.success(required(Expr(in),"Bad expression")); |
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585 } |
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586 |
154
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587 private Expressions Expr(In in) throws ParseException { |
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588 parser.begin(); |
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589 Expressions exp; |
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590 return (exp = VarArgs(in)) != null |
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591 || (exp = OrExpr(in)) != null |
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592 ? parser.success(exp) |
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593 : parser.failure((Expressions)null) |
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594 ; |
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595 } |
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596 |
154
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597 private Expressions OrExpr(In in) throws ParseException { |
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598 int start = parser.begin(); |
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599 Expressions exp = AndExpr(in); |
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600 if( exp==null ) |
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601 return parser.failure(null); |
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602 while( Keyword("or",in) ) { |
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603 Expressions exp2 = AndExpr(in); |
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604 exp = new OrExpr( se(start), expr(exp), required(expr(exp2)) ); |
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605 } |
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606 return parser.success(exp); |
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607 } |
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608 |
154
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609 private Expressions AndExpr(In in) throws ParseException { |
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610 int start = parser.begin(); |
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611 Expressions exp = RelExpr(in); |
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612 if( exp==null ) |
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613 return parser.failure(null); |
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614 while( Keyword("and",in) ) { |
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615 Expressions exp2 = RelExpr(in); |
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616 exp = new AndExpr( se(start), expr(exp), required(expr(exp2)) ); |
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617 } |
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618 return parser.success(exp); |
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619 } |
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620 |
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621 private Expressions RelExpr(In in) throws ParseException { |
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622 int start = parser.begin(); |
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623 Expressions exp = ConcatExpr(in); |
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624 if( exp==null ) |
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625 return parser.failure(null); |
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626 while(true) { |
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627 if( parser.match("==") ) { |
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628 Spaces(in); |
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629 Expressions exp2 = ConcatExpr(in); |
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630 exp = new EqExpr( se(start), expr(exp), required(expr(exp2)) ); |
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631 } else if( parser.match("~=") ) { |
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632 Spaces(in); |
191
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633 Expressions exp2 = ConcatExpr(in); |
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634 exp = new NotExpr( se(start), new EqExpr( se(start), expr(exp), required(expr(exp2)) ) ); |
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635 } else if( parser.match("<=") ) { |
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636 Spaces(in); |
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637 Expressions exp2 = ConcatExpr(in); |
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638 exp = new LeExpr( se(start), expr(exp), required(expr(exp2)) ); |
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639 } else if( parser.match(">=") ) { |
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640 Spaces(in); |
191
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641 Expressions exp2 = ConcatExpr(in); |
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642 exp = new LeExpr( se(start), required(expr(exp2)), expr(exp) ); |
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643 } else if( parser.match("<") ) { |
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644 Spaces(in); |
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645 Expressions exp2 = ConcatExpr(in); |
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646 exp = new LtExpr( se(start), expr(exp), required(expr(exp2)) ); |
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647 } else if( parser.match(">") ) { |
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648 Spaces(in); |
191
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649 Expressions exp2 = ConcatExpr(in); |
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650 exp = new LtExpr( se(start), required(expr(exp2)), expr(exp) ); |
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651 } else |
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652 break; |
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653 } |
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654 return parser.success(exp); |
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655 } |
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656 |
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657 private Expressions ConcatExpr(In in) throws ParseException { |
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658 int start = parser.begin(); |
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659 Expressions exp = SumExpr(in); |
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660 if( exp==null ) |
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661 return parser.failure(null); |
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662 if( parser.match("..") ) { |
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663 Spaces(in); |
191
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664 Expressions exp2 = ConcatExpr(in); |
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665 exp = new ConcatExpr( se(start), expr(exp), required(expr(exp2)) ); |
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666 } |
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667 return parser.success(exp); |
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668 } |
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669 |
154
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670 private Expressions SumExpr(In in) throws ParseException { |
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671 int start = parser.begin(); |
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672 Expressions exp = TermExpr(in); |
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673 if( exp==null ) |
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674 return parser.failure(null); |
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675 while(true) { |
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676 if( parser.match('+') ) { |
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677 Spaces(in); |
191
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678 Expressions exp2 = TermExpr(in); |
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679 exp = new AddExpr( se(start), expr(exp), required(expr(exp2)) ); |
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680 } else if( Minus() ) { |
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681 Spaces(in); |
191
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682 Expressions exp2 = TermExpr(in); |
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683 exp = new SubExpr( se(start), expr(exp), required(expr(exp2)) ); |
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684 } else |
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685 break; |
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686 } |
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687 return parser.success(exp); |
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688 } |
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689 |
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690 private boolean Minus() { |
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691 parser.begin(); |
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692 return parser.match('-') && !parser.match('-') ? parser.success() : parser.failure(); |
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693 } |
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694 |
154
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695 private Expressions TermExpr(In in) throws ParseException { |
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696 int start = parser.begin(); |
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697 Expressions exp = UnaryExpr(in); |
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698 if( exp==null ) |
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699 return parser.failure(null); |
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700 while(true) { |
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701 if( parser.match('*') ) { |
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702 Spaces(in); |
191
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703 Expressions exp2 = UnaryExpr(in); |
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704 exp = new MulExpr( se(start), expr(exp), required(expr(exp2)) ); |
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705 } else if( parser.match('/') ) { |
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706 Spaces(in); |
191
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707 Expressions exp2 = UnaryExpr(in); |
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708 exp = new DivExpr( se(start), expr(exp), required(expr(exp2)) ); |
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709 } else if( Mod() ) { |
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710 Spaces(in); |
191
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711 Expressions exp2 = UnaryExpr(in); |
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712 exp = new ModExpr( se(start), expr(exp), required(expr(exp2)) ); |
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713 } else |
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714 break; |
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715 } |
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716 return parser.success(exp); |
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717 } |
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718 |
107
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719 private boolean Mod() { |
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720 parser.begin(); |
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721 return parser.match('%') && !parser.match('>') ? parser.success() : parser.failure(); |
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722 } |
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723 |
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724 private Expressions UnaryExpr(In in) throws ParseException { |
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725 int start = parser.begin(); |
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726 if( parser.match('#') ) { |
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727 Spaces(in); |
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728 Expressions exp = UnaryExpr(in); |
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729 return parser.success( new LenExpr( se(start), required(expr(exp)) ) ); |
104
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730 } |
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731 if( Minus() ) { |
129
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732 Spaces(in); |
191
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733 Expressions exp = UnaryExpr(in); |
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734 return parser.success( new UnmExpr( se(start), required(expr(exp)) ) ); |
104
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735 } |
129
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736 if( Keyword("not",in) ) { |
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737 Spaces(in); |
191
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738 Expressions exp = UnaryExpr(in); |
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739 return parser.success( new NotExpr( se(start), required(expr(exp)) ) ); |
104
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740 } |
154
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741 Expressions exp = PowExpr(in); |
104
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742 if( exp==null ) |
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743 return parser.failure(null); |
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744 return parser.success(exp); |
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745 } |
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746 |
154
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747 private Expressions PowExpr(In in) throws ParseException { |
104
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748 int start = parser.begin(); |
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749 Expressions exp = SingleExpr(in); |
104
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750 if( exp==null ) |
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751 return parser.failure(null); |
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752 if( parser.match('^') ) { |
129
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753 Spaces(in); |
191
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754 Expressions exp2 = PowExpr(in); |
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755 exp = new ConcatExpr( se(start), expr(exp), required(expr(exp2)) ); |
104
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756 } |
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757 return parser.success(exp); |
14
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758 } |
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759 |
154
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760 private Expressions SingleExpr(In in) throws ParseException { |
104
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761 parser.begin(); |
154
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762 Expressions exp; |
129
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763 exp = FunctionExpr(in); |
104
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764 if( exp != null ) |
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765 return parser.success(exp); |
129
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766 exp = TableExpr(in); |
104
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767 if( exp != null ) |
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768 return parser.success(exp); |
129
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769 exp = VarExp(in); |
104
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770 if( exp != null ) |
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771 return parser.success(exp); |
129
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772 exp = Literal(in); |
104
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773 if( exp != null ) |
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774 return parser.success(exp); |
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775 return parser.failure(null); |
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776 } |
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777 |
129
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778 private Expr FunctionExpr(In in) throws ParseException { |
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779 if( !Keyword("function",in) ) |
104
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780 return null; |
129
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781 return RequiredFunction(in); |
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782 } |
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783 |
129
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784 private FnDef RequiredFunction(In in) throws ParseException { |
104
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785 int start = parser.begin(); |
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786 RequiredMatch('('); |
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787 In inParens = in.parens(); |
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788 Spaces(inParens); |
104
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789 frame = new Frame(frame); |
129
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790 List<String> names = NameList(in); |
104
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791 if( names != null ) { |
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792 addSymbols(names); |
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793 if( parser.match(',') ) { |
129
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794 Spaces(inParens); |
104
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795 if( !parser.match("...") ) |
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796 throw parser.exception(); |
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797 frame.isVarArg = true; |
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798 } |
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799 } else if( parser.match("...") ) { |
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800 Spaces(inParens); |
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801 frame.isVarArg = true; |
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802 } |
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803 RequiredMatch(')'); |
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804 Spaces(in); |
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805 Stmt block = RequiredBlock(); |
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806 RequiredKeyword("end",in); |
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807 FnDef fnDef = newFnDef(start,block); |
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808 frame = frame.parent; |
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809 return parser.success(fnDef); |
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810 } |
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811 |
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812 private VarArgs VarArgs(In in) throws ParseException { |
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813 int start = parser.begin(); |
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814 if( !frame.isVarArg || !parser.match("...") ) |
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815 return parser.failure(null); |
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816 Spaces(in); |
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817 return parser.success( new VarArgs(se(start)) ); |
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818 } |
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819 |
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820 private Expr TableExpr(In in) throws ParseException { |
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821 int start = parser.begin(); |
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822 if( !parser.match('{') ) |
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823 return parser.failure(null); |
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824 In inParens = in.parens(); |
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825 Spaces(inParens); |
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826 List<TableExpr.Field> fields = new ArrayList<TableExpr.Field>(); |
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827 List<Expressions> builder = new ArrayList<Expressions>(); |
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828 while( Field(fields,builder,in) && FieldSep(inParens) ); |
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829 Spaces(inParens); |
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830 if( !parser.match('}') ) |
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831 throw parser.exception("Expected table element or '}'"); |
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832 return parser.success( new TableExpr( se(start), fields.toArray(new TableExpr.Field[0]), ExpList.build(builder) ) ); |
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833 } |
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834 |
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835 private boolean FieldSep(In in) throws ParseException { |
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836 if( !parser.anyOf(",;") ) |
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837 return false; |
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838 Spaces(in); |
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839 return true; |
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840 } |
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841 |
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842 private boolean Field(List<TableExpr.Field> fields,List<Expressions> builder,In in) throws ParseException { |
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843 parser.begin(); |
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844 Expr exp = SubExpr(in); |
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845 if( exp==null ) |
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846 exp = NameExpr(in); |
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847 if( exp!=null && parser.match('=') ) { |
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848 Spaces(in); |
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849 fields.add( new TableExpr.Field( exp, required(expr(Expr(in))) ) ); |
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850 return parser.success(); |
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851 } |
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852 parser.rollback(); |
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853 Expressions exprs = Expr(in); |
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854 if( exprs != null ) { |
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855 builder.add(exprs); |
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856 return parser.success(); |
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857 } |
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858 return parser.failure(); |
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859 } |
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860 |
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861 private Expressions VarExp(In in) throws ParseException { |
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862 Var var = VarZ(in); |
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863 return var==null ? null : var.expr(); |
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864 } |
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865 |
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866 private Var VarZ(In in) throws ParseException { |
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867 int start = parser.begin(); |
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868 Var var = VarStart(in); |
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869 if( var==null ) |
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870 return parser.failure(null); |
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871 Var var2; |
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872 while( (var2=Var2(in,start,var.expr())) != null ) { |
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873 var = var2; |
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874 } |
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875 return parser.success(var); |
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876 } |
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877 |
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878 private Var Var2(In in,int start,Expressions exp1) throws ParseException { |
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879 parser.begin(); |
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880 Var var = VarExt(in,start,exp1); |
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881 if( var != null ) |
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882 return parser.success(var); |
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883 if( parser.match("->") ) { |
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884 Spaces(in); |
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885 List<Expressions> builder = new ArrayList<Expressions>(); |
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886 builder.add(exp1); |
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887 Expr exp2 = expr(RequiredVarExpB(in)); |
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888 FnCall fnCall = required(Args( in, start, exp2, builder )); |
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889 return parser.success(exprVar(fnCall)); |
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890 } |
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891 FnCall fnCall = Args( in, start, expr(exp1), new ArrayList<Expressions>() ); |
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892 if( fnCall != null ) |
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893 return parser.success(exprVar(fnCall)); |
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894 return parser.failure(null); |
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895 } |
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896 |
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897 private Expressions RequiredVarExpB(In in) throws ParseException { |
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898 int start = parser.begin(); |
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899 Var var = required(VarStart(in)); |
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900 Var var2; |
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901 while( (var2=VarExt(in,start,var.expr())) != null ) { |
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902 var = var2; |
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903 } |
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904 return parser.success(var.expr()); |
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905 } |
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906 |
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907 private Var VarExt(In in,int start,Expressions exp1) throws ParseException { |
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908 parser.begin(); |
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909 Expr exp2 = SubExpr(in); |
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910 if( exp2 != null ) |
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911 return parser.success(indexVar(start,expr(exp1),exp2)); |
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912 if( parser.match('.') ) { |
129
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913 Spaces(in); |
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914 exp2 = NameExpr(in); |
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915 if( exp2!=null ) |
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916 return parser.success(indexVar(start,expr(exp1),exp2)); |
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917 } |
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918 return parser.failure(null); |
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919 } |
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920 |
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921 private Var VarStart(In in) throws ParseException { |
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922 int start = parser.begin(); |
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923 if( parser.match('(') ) { |
129
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924 In inParens = in.parens(); |
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925 Spaces(inParens); |
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926 Expr exp = expr(RequiredExpr(inParens)); |
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927 RequiredMatch(')'); |
129
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928 Spaces(in); |
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929 return parser.success(exprVar(exp)); |
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930 } |
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931 String name = Name(in); |
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932 if( name != null ) |
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933 return parser.success(nameVar(start,name)); |
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934 return parser.failure(null); |
9
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935 } |
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936 |
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937 private Expr env() { |
34
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938 int index = stackIndex(_ENV); |
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939 if( index != -1 ) |
40
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940 return new GetLocalVar(null,index); |
34
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941 index = upValueIndex(_ENV); |
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942 if( index != -1 ) |
40
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943 return new GetUpVar(null,index); |
34
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944 throw new RuntimeException("_ENV not found"); |
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945 } |
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946 |
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947 private interface Var { |
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948 public Expressions expr(); |
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949 public Settable settable(); |
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950 } |
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951 |
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952 private Var nameVar(final int start,final String name) { |
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953 return nameVar(se(start,name),name); |
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954 } |
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955 |
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956 private Var nameVar(final LuanSource.Element se,final String name) { |
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957 return new Var() { |
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958 |
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959 public Expr expr() { |
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960 int index = stackIndex(name); |
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961 if( index != -1 ) |
157
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962 return new GetLocalVar(se,index); |
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963 index = upValueIndex(name); |
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964 if( index != -1 ) |
157
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965 return new GetUpVar(se,index); |
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966 return new IndexExpr( se, env(), new ConstExpr(name) ); |
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967 } |
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968 |
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969 public Settable settable() { |
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970 int index = stackIndex(name); |
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971 if( index != -1 ) |
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972 return new SetLocalVar(index); |
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973 index = upValueIndex(name); |
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974 if( index != -1 ) |
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975 return new SetUpVar(index); |
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976 return new SetTableEntry( se, env(), new ConstExpr(name) ); |
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977 } |
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978 }; |
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979 } |
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980 |
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981 private Var exprVar(final Expressions expr) { |
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982 return new Var() { |
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983 |
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984 public Expressions expr() { |
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985 return expr; |
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986 } |
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987 |
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988 public Settable settable() { |
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989 return null; |
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990 } |
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991 }; |
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992 } |
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993 |
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994 private Var indexVar(final int start,final Expr table,final Expr key) { |
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995 return new Var() { |
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996 |
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997 public Expr expr() { |
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998 return new IndexExpr( se(start), table, key ); |
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999 } |
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1000 |
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1001 public Settable settable() { |
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1002 return new SetTableEntry(se(start),table,key); |
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1003 } |
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1004 }; |
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1005 } |
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1006 |
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1007 private FnCall Args(In in,int start,Expr fn,List<Expressions> builder) throws ParseException { |
104
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1008 parser.begin(); |
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1009 return args(in,builder) |
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1010 ? parser.success( new FnCall( se(start), fn, ExpList.build(builder) ) ) |
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1011 : parser.failure((FnCall)null); |
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1012 } |
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1013 |
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1014 private boolean args(In in,List<Expressions> builder) throws ParseException { |
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1015 if( parser.match('(') ) { |
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1016 In inParens = in.parens(); |
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1017 Spaces(inParens); |
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1018 ExpList(inParens,builder); // optional |
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1019 if( !parser.match(')') ) |
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1020 throw parser.exception("Expression or ')' expected"); |
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1021 Spaces(in); |
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1022 return true; |
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1023 } |
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1024 Expr exp = TableExpr(in); |
107
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1025 if( exp != null ) { |
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1026 builder.add(exp); |
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1027 return true; |
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1028 } |
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1029 String s = StringLiteral(in); |
107
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1030 if( s != null ) { |
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1031 builder.add( new ConstExpr(s) ); |
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1032 return true; |
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1033 } |
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1034 /* |
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1035 Expressions exps = TemplateExpressions(in); |
107
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1036 if( exps != null ) { |
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1037 builder.add(exps); |
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1038 return true; |
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1039 } |
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1040 */ |
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1041 return false; |
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1042 } |
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1043 |
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1044 private Expressions ExpList(In in) throws ParseException { |
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1045 List<Expressions> builder = new ArrayList<Expressions>(); |
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1046 return ExpList(in,builder) ? ExpList.build(builder) : null; |
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1047 } |
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1048 |
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1049 private boolean ExpList(In in,List<Expressions> builder) throws ParseException { |
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1050 parser.begin(); |
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1051 Expressions exp = TemplateExpressions(in); |
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1052 if( exp != null ) { |
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1053 builder.add(exp); |
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1054 return parser.success(); |
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1055 } |
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1056 exp = Expr(in); |
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1057 if( exp==null ) |
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1058 return parser.failure(); |
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1059 builder.add(exp); |
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1060 while( parser.match(',') ) { |
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1061 Spaces(in); |
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1062 exp = TemplateExpressions(in); |
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1063 if( exp != null ) { |
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1064 builder.add(exp); |
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1065 return parser.success(); |
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1066 } |
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1067 builder.add( RequiredExpr(in) ); |
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1068 } |
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1069 return parser.success(); |
9
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1070 } |
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1071 |
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1072 private Expr SubExpr(In in) throws ParseException { |
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1073 parser.begin(); |
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1074 if( !parser.match('[') ) |
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1075 return parser.failure(null); |
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1076 In inParens = in.parens(); |
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1077 Spaces(inParens); |
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1078 Expr exp = expr(RequiredExpr(inParens)); |
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1079 RequiredMatch(']'); |
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1080 Spaces(in); |
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1081 return parser.success(exp); |
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1082 } |
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1083 |
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1084 private Expr NameExpr(In in) throws ParseException { |
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1085 String name = Name(in); |
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1086 return name==null ? null : new ConstExpr(name); |
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1087 } |
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1088 |
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1089 private String RequiredName(In in) throws ParseException { |
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1090 parser.begin(); |
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1091 String name = Name(in); |
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1092 if( name==null ) |
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1093 throw parser.exception("Name expected"); |
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1094 return parser.success(name); |
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1095 } |
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1096 |
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1097 private String Name(In in) throws ParseException { |
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1098 int start = parser.begin(); |
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1099 if( !NameFirstChar() ) |
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1100 return parser.failure(null); |
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1101 while( NameChar() ); |
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1102 String match = parser.textFrom(start); |
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1103 if( keywords.contains(match) ) |
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1104 return parser.failure(null); |
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1105 Spaces(in); |
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1106 return parser.success(match); |
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1107 } |
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1108 |
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1109 private boolean NameChar() { |
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1110 return NameFirstChar() || Digit(); |
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1111 } |
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1112 |
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1113 private boolean NameFirstChar() { |
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1114 return parser.inCharRange('a', 'z') || parser.inCharRange('A', 'Z') || parser.match('_'); |
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1115 } |
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1116 |
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1117 private void RequiredMatch(char c) throws ParseException { |
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1118 if( !parser.match(c) ) |
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1119 throw parser.exception("'"+c+"' expected"); |
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1120 } |
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1121 |
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1122 private void RequiredMatch(String s) throws ParseException { |
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1123 if( !parser.match(s) ) |
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1124 throw parser.exception("'"+s+"' expected"); |
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1125 } |
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1126 |
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1127 private void RequiredKeyword(String keyword,In in) throws ParseException { |
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1128 if( !Keyword(keyword,in) ) |
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1129 throw parser.exception("'"+keyword+"' expected"); |
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1130 } |
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1131 |
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1132 private boolean Keyword(String keyword,In in) throws ParseException { |
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1133 parser.begin(); |
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1134 if( !parser.match(keyword) || NameChar() ) |
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1135 return parser.failure(); |
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1136 Spaces(in); |
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1137 return parser.success(); |
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1138 } |
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1139 |
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1140 private static final Set<String> keywords = new HashSet<String>(Arrays.asList( |
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1141 "and", |
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1142 "break", |
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1143 "catch", |
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1144 "do", |
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1145 "else", |
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1146 "elseif", |
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1147 "end", |
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1148 "false", |
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1149 "for", |
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1150 "function", |
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1151 "goto", |
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1152 "if", |
108
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1153 "import", |
12
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1154 "in", |
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|
1155 "local", |
9cea1aea5eef
CmdLine can run files
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|
1156 "nil", |
9cea1aea5eef
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|
1157 "not", |
9cea1aea5eef
CmdLine can run files
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|
1158 "or", |
9cea1aea5eef
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1159 "repeat", |
9cea1aea5eef
CmdLine can run files
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1160 "return", |
9cea1aea5eef
CmdLine can run files
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1161 "then", |
9cea1aea5eef
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|
1162 "true", |
42
786699c78837
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1163 "try", |
12
9cea1aea5eef
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|
1164 "until", |
9cea1aea5eef
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|
1165 "while" |
9cea1aea5eef
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|
1166 )); |
9cea1aea5eef
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1167 |
129
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1168 private Expr Literal(In in) throws ParseException { |
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1169 if( NilLiteral(in) ) |
104
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1170 return new ConstExpr(null); |
129
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1171 Boolean b = BooleanLiteral(in); |
104
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1172 if( b != null ) |
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1173 return new ConstExpr(b); |
129
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1174 Number n = NumberLiteral(in); |
104
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1175 if( n != null ) |
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1176 return new ConstExpr(n); |
129
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1177 String s = StringLiteral(in); |
104
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1178 if( s != null ) |
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1179 return new ConstExpr(s); |
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1180 return null; |
5
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1181 } |
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1182 |
129
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1183 private boolean NilLiteral(In in) throws ParseException { |
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1184 return Keyword("nil",in); |
65
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multi-line statements
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1185 } |
1ff53a88579a
multi-line statements
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1186 |
129
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1187 private Boolean BooleanLiteral(In in) throws ParseException { |
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1188 if( Keyword("true",in) ) |
104
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1189 return true; |
129
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1190 if( Keyword("false",in) ) |
104
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1191 return false; |
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1192 return null; |
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1193 } |
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1194 |
129
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1195 private Number NumberLiteral(In in) throws ParseException { |
104
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1196 parser.begin(); |
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1197 Number n; |
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1198 if( parser.matchIgnoreCase("0x") ) { |
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1199 n = HexNumber(); |
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1200 } else { |
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1201 n = DecNumber(); |
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1202 } |
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1203 if( n==null || NameChar() ) |
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1204 return parser.failure(null); |
129
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1205 Spaces(in); |
104
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1206 return parser.success(n); |
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1207 } |
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1208 |
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1209 private Number DecNumber() { |
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1210 int start = parser.begin(); |
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1211 if( Int() ) { |
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1212 if( parser.match('.') ) |
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1213 Int(); // optional |
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1214 } else if( parser.match('.') && Int() ) { |
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1215 // ok |
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1216 } else |
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1217 return parser.failure(null); |
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1218 Exponent(); // optional |
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1219 return parser.success(Double.valueOf(parser.textFrom(start))); |
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1220 } |
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1221 |
104
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1222 private boolean Exponent() { |
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1223 parser.begin(); |
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1224 if( !parser.matchIgnoreCase("e") ) |
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1225 return parser.failure(); |
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1226 parser.anyOf("+-"); // optional |
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1227 if( !Int() ) |
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1228 return parser.failure(); |
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1229 return parser.success(); |
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1230 } |
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1231 |
104
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1232 private boolean Int() { |
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1233 if( !Digit() ) |
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1234 return false; |
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1235 while( Digit() ); |
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1236 return true; |
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1237 } |
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1238 |
104
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1239 private boolean Digit() { |
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1240 return parser.inCharRange('0', '9'); |
16
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1241 } |
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1242 |
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1243 private Number HexNumber() { |
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1244 int start = parser.begin(); |
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1245 double n; |
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1246 if( HexInt() ) { |
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1247 n = (double)Long.parseLong(parser.textFrom(start),16); |
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1248 if( parser.match('.') ) { |
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1249 start = parser.currentIndex(); |
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1250 if( HexInt() ) { |
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1251 String dec = parser.textFrom(start); |
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1252 n += (double)Long.parseLong(dec,16) / Math.pow(16,dec.length()); |
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1253 } |
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1254 } |
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1255 } else if( parser.match('.') && HexInt() ) { |
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1256 String dec = parser.textFrom(start+1); |
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1257 n = (double)Long.parseLong(dec,16) / Math.pow(16,dec.length()); |
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1258 } else { |
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1259 return parser.failure(null); |
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1260 } |
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1261 if( parser.matchIgnoreCase("p") ) { |
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1262 parser.anyOf("+-"); // optional |
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1263 start = parser.currentIndex(); |
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1264 if( !HexInt() ) |
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1265 return parser.failure(null); |
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1266 n *= Math.pow(2,(double)Long.parseLong(parser.textFrom(start))); |
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1267 } |
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1268 return parser.success(Double.valueOf(n)); |
16
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1269 } |
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1270 |
104
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1271 private boolean HexInt() { |
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1272 if( !HexDigit() ) |
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1273 return false; |
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1274 while( HexDigit() ); |
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1275 return true; |
16
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1276 } |
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1277 |
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1278 |
104
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1279 private boolean HexDigit() { |
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1280 return Digit() || parser.anyOf("abcdefABCDEF"); |
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1281 } |
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1282 |
129
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1283 private String StringLiteral(In in) throws ParseException { |
104
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1284 String s; |
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1285 if( (s=QuotedString('"'))==null |
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1286 && (s=QuotedString('\''))==null |
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1287 && (s=LongString())==null |
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1288 ) |
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1289 return null; |
129
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1290 Spaces(in); |
104
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1291 return s; |
16
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1292 } |
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1293 |
104
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1294 private String LongString() throws ParseException { |
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1295 parser.begin(); |
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1296 if( !parser.match('[') ) |
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1297 return parser.failure(null); |
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1298 int start = parser.currentIndex(); |
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1299 while( parser.match('=') ); |
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1300 int nEquals = parser.currentIndex() - start; |
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1301 if( !parser.match('[') ) |
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1302 return parser.failure(null); |
120
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1303 EndOfLine(); |
104
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1304 start = parser.currentIndex(); |
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1305 while( !LongBracketsEnd(nEquals) ) { |
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1306 if( !parser.anyChar() ) |
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1307 throw parser.exception("Unclosed long string"); |
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1308 } |
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1309 String s = parser.text.substring( start, parser.currentIndex() - nEquals - 2 ); |
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1310 return parser.success(s); |
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1311 } |
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1312 |
104
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1313 private String QuotedString(char quote) throws ParseException { |
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1314 parser.begin(); |
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1315 if( !parser.match(quote) ) |
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1316 return parser.failure(null); |
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1317 StringBuilder buf = new StringBuilder(); |
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1318 while( !parser.match(quote) ) { |
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1319 Character c = EscSeq(); |
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1320 if( c != null ) { |
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1321 buf.append(c); |
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1322 } else { |
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1323 if( !parser.anyChar() ) |
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1324 throw parser.exception("Unclosed string"); |
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1325 buf.append(parser.lastChar()); |
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1326 } |
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1327 } |
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1328 return parser.success(buf.toString()); |
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1329 } |
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1330 |
104
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1331 private Character EscSeq() { |
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1332 parser.begin(); |
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1333 if( !parser.match('\\') ) |
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1334 return parser.failure(null); |
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1335 if( parser.match('a') ) return parser.success('\u0007'); |
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1336 if( parser.match('b') ) return parser.success('\b'); |
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1337 if( parser.match('f') ) return parser.success('\f'); |
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1338 if( parser.match('n') ) return parser.success('\n'); |
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1339 if( parser.match('r') ) return parser.success('\r'); |
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1340 if( parser.match('t') ) return parser.success('\t'); |
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1341 if( parser.match('v') ) return parser.success('\u000b'); |
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1342 if( parser.match('\\') ) return parser.success('\\'); |
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1343 if( parser.match('"') ) return parser.success('"'); |
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1344 if( parser.match('\'') ) return parser.success('\''); |
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1345 int start = parser.currentIndex(); |
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1346 if( parser.match('x') && HexDigit() && HexDigit() ) |
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1347 return parser.success((char)Integer.parseInt(parser.textFrom(start+1),16)); |
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1348 if( Digit() ) { |
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1349 if( Digit() ) Digit(); // optional |
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1350 return parser.success((char)Integer.parseInt(parser.textFrom(start))); |
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1351 } |
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1352 return parser.failure(null); |
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1353 } |
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1354 |
129
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1355 private void Spaces(In in) throws ParseException { |
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1356 while( parser.anyOf(" \t") || Comment() || ContinueOnNextLine() || in.parens && NewLine() ); |
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1357 } |
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1358 |
104
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1359 private boolean ContinueOnNextLine() { |
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1360 parser.begin(); |
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1361 return parser.match('\\') && EndOfLine() ? parser.success() : parser.failure(); |
7
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1362 } |
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1363 |
104
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1364 private boolean NewLine() { |
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1365 if( !EndOfLine() ) |
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1366 return false; |
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1367 if( parser.match("--") ) { |
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1368 while( parser.noneOf("\r\n") ); |
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1369 } |
18
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1370 return true; |
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1371 } |
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1372 |
104
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1373 private boolean Comment() throws ParseException { |
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1374 parser.begin(); |
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1375 if( !parser.match("--[") ) |
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1376 return parser.failure(); |
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1377 int start = parser.currentIndex(); |
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1378 while( parser.match('=') ); |
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1379 int nEquals = parser.currentIndex() - start; |
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1380 if( !parser.match('[') ) |
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1381 return parser.failure(); |
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1382 while( !LongBracketsEnd(nEquals) ) { |
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1383 if( !parser.anyChar() ) |
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1384 throw parser.exception("Unclosed comment"); |
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1385 } |
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1386 return parser.success(); |
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1387 } |
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1388 |
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1389 private boolean LongBracketsEnd(int nEquals) { |
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1390 parser.begin(); |
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1391 if( !parser.match(']') ) |
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1392 return parser.failure(); |
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1393 while( nEquals-- > 0 ) { |
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1394 if( !parser.match('=') ) |
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1395 return parser.failure(); |
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1396 } |
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1397 if( !parser.match(']') ) |
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1398 return parser.failure(); |
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1399 return parser.success(); |
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1400 } |
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1401 |
5
9ef0fd711101
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1402 } |