Mercurial Hosting > luan
annotate src/luan/interp/LuanParser.java @ 118:735708619119
add Debug.debug()
git-svn-id: https://luan-java.googlecode.com/svn/trunk@119 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Sun, 01 Jun 2014 07:07:31 +0000 |
parents | 1ff1c32417eb |
children | 8d7730a5e3b4 |
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1 package luan.interp; |
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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.parser.Parser; |
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13 import luan.parser.ParseException; |
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14 import luan.lib.PackageLib; |
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15 |
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16 |
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17 final class LuanParser { |
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18 |
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19 private static final class Frame { |
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20 final Frame parent; |
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21 final List<String> symbols = new ArrayList<String>(); |
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22 int stackSize = 0; |
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23 int loops = 0; |
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24 boolean isVarArg = false; |
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25 final List<String> upValueSymbols = new ArrayList<String>(); |
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26 final List<UpValue.Getter> upValueGetters = new ArrayList<UpValue.Getter>(); |
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27 |
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28 Frame(UpValue.Getter envGetter) { |
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29 this.parent = null; |
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30 upValueSymbols.add(_ENV); |
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31 upValueGetters.add(envGetter); |
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32 } |
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33 |
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34 Frame(Frame parent) { |
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35 this.parent = parent; |
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36 if( upValueIndex(_ENV) != 0 ) |
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37 throw new RuntimeException(); |
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38 } |
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39 |
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40 int stackIndex(String name) { |
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41 int i = symbols.size(); |
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42 while( --i >= 0 ) { |
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43 if( symbols.get(i).equals(name) ) |
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44 return i; |
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45 } |
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46 return -1; |
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47 } |
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48 |
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49 int upValueIndex(String name) { |
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50 int i = upValueSymbols.size(); |
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51 while( --i >= 0 ) { |
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52 if( upValueSymbols.get(i).equals(name) ) |
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53 return i; |
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54 } |
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55 if( parent==null ) |
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56 return -1; |
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57 i = parent.stackIndex(name); |
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58 if( i != -1 ) { |
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59 upValueGetters.add(new UpValue.StackGetter(i)); |
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60 } else { |
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61 i = parent.upValueIndex(name); |
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62 if( i == -1 ) |
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63 return -1; |
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64 upValueGetters.add(new UpValue.NestedGetter(i)); |
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65 } |
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66 upValueSymbols.add(name); |
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67 return upValueSymbols.size() - 1; |
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68 } |
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69 |
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70 void addUpValueGetter(String name,UpValue.Getter upValueGetter) { |
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71 upValueSymbols.add(name); |
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72 upValueGetters.add(upValueGetter); |
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73 } |
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74 } |
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75 |
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76 private static final String _ENV = "_ENV"; |
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77 private static final UpValue.Getter[] NO_UP_VALUE_GETTERS = new UpValue.Getter[0]; |
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78 |
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79 private final LuanSource source; |
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80 private Frame frame; |
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81 private final Parser parser; |
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82 private final boolean interactive; |
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83 |
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84 LuanParser(LuanSource source,UpValue.Getter envGetter) { |
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85 this.source = source; |
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86 this.frame = new Frame(envGetter); |
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87 this.parser = new Parser(source); |
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88 this.interactive = envGetter==UpValue.globalGetter; |
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89 } |
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90 |
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91 void addVar(String name,Object value) { |
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92 frame.addUpValueGetter(name,new UpValue.ValueGetter(value)); |
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93 } |
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94 |
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95 private LuanSource.Element se(int start) { |
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96 return new LuanSource.Element(source,start,parser.currentIndex()); |
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97 } |
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98 |
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99 private List<String> symbols() { |
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100 return frame.symbols; |
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101 } |
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102 |
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103 private int symbolsSize() { |
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104 return frame.symbols.size(); |
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105 } |
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106 |
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107 private void addSymbol(String name) { |
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108 frame.symbols.add(name); |
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109 if( frame.stackSize < symbolsSize() ) |
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110 frame.stackSize = symbolsSize(); |
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111 } |
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112 |
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113 private void addSymbols(List<String> names) { |
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114 frame.symbols.addAll(names); |
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115 if( frame.stackSize < symbolsSize() ) |
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116 frame.stackSize = symbolsSize(); |
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117 } |
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118 |
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119 private int stackIndex(String name) { |
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120 return frame.stackIndex(name); |
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121 } |
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122 |
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123 private void popSymbols(int n) { |
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124 List<String> symbols = frame.symbols; |
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125 while( n-- > 0 ) { |
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126 symbols.remove(symbols.size()-1); |
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127 } |
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128 } |
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129 |
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130 private int upValueIndex(String name) { |
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131 return frame.upValueIndex(name); |
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132 } |
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133 |
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134 private void incLoops() { |
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135 frame.loops++; |
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136 } |
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137 |
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138 private void decLoops() { |
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139 frame.loops--; |
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140 } |
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141 |
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142 private <T> T required(T t) throws ParseException { |
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143 if( t==null ) |
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144 throw parser.exception(); |
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145 return t; |
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146 } |
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147 |
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148 private <T> T required(T t,String msg) throws ParseException { |
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149 if( t==null ) |
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150 throw parser.exception(msg); |
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151 return t; |
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152 } |
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153 |
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154 private static Expr expr(Code code) { |
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155 if( code instanceof Expressions ) |
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156 return new ExpressionsExpr((Expressions)code); |
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157 return (Expr)code; |
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158 } |
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159 |
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160 private FnDef newFnDef(int start,Stmt stmt) { |
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161 return new FnDef( se(start), stmt, frame.stackSize, symbolsSize(), frame.isVarArg, frame.upValueGetters.toArray(NO_UP_VALUE_GETTERS) ); |
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162 } |
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163 |
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164 FnDef Expressions() throws ParseException { |
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165 Spaces(); |
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166 int start = parser.begin(); |
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167 Expressions exprs = ExpList(); |
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168 if( exprs != null && parser.endOfInput() ) { |
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169 Stmt stmt = new ReturnStmt( se(start), exprs ); |
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170 return parser.success(newFnDef(start,stmt)); |
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171 } |
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172 return parser.failure(null); |
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173 } |
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174 |
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175 FnDef RequiredModule() throws ParseException { |
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176 Spaces(); |
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177 int start = parser.begin(); |
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178 frame.isVarArg = true; |
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179 Stmt stmt = RequiredBlock(); |
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180 if( parser.endOfInput() ) |
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181 return parser.success(newFnDef(start,stmt)); |
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182 throw parser.exception(); |
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183 } |
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184 |
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185 private Stmt RequiredBlock() throws ParseException { |
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186 List<Stmt> stmts = new ArrayList<Stmt>(); |
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187 int stackStart = symbolsSize(); |
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188 Stmt(stmts); |
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189 while( StmtSep(stmts) ) { |
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190 Spaces(); |
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191 Stmt(stmts); |
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192 } |
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193 int stackEnd = symbolsSize(); |
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194 popSymbols( stackEnd - stackStart ); |
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195 if( stmts.isEmpty() ) |
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196 return Stmt.EMPTY; |
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197 if( stmts.size()==1 && stackStart==stackEnd ) |
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198 return stmts.get(0); |
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199 return new Block( stmts.toArray(new Stmt[0]), stackStart, stackEnd ); |
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200 } |
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201 |
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202 private boolean StmtSep(List<Stmt> stmts) throws ParseException { |
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203 parser.begin(); |
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204 if( parser.match( ';' ) ) |
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205 return parser.success(); |
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206 if( parser.match( "--" ) ) { |
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207 while( parser.noneOf("\r\n") ); |
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208 } |
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209 return EndOfLine() ? parser.success() : parser.failure(); |
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210 } |
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211 |
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212 private boolean EndOfLine() { |
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213 return parser.match( "\r\n" ) || parser.match( '\r' ) || parser.match( '\n' ); |
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214 } |
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215 |
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216 private void Stmt(List<Stmt> stmts) throws ParseException { |
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217 if( LocalStmt(stmts) ) |
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218 return; |
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219 Stmt stmt; |
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220 if( (stmt=ReturnStmt()) != null |
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221 || (stmt=FunctionStmt()) != null |
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222 || (stmt=LocalFunctionStmt()) != null |
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223 || (stmt=ImportStmt()) != null |
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224 || (stmt=BreakStmt()) != null |
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225 || (stmt=GenericForStmt()) != null |
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226 || (stmt=TryStmt()) != null |
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227 || (stmt=DoStmt()) != null |
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228 || (stmt=WhileStmt()) != null |
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229 || (stmt=FunctionStmt()) != null |
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230 || (stmt=RepeatStmt()) != null |
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231 || (stmt=IfStmt()) != null |
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232 || (stmt=SetStmt()) != null |
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233 || (stmt=ExpressionsStmt()) != null |
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234 ) { |
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235 stmts.add(stmt); |
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236 } |
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237 } |
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238 |
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239 private Expressions JspExpressions() throws ParseException { |
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240 int start = parser.begin(); |
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241 if( !parser.match( "%>" ) ) |
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242 return parser.failure(null); |
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243 EndOfLine(); |
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244 ExpList.Builder builder = new ExpList.Builder(); |
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245 while(true) { |
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246 if( parser.match( "<%=" ) ) { |
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247 Spaces(); |
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248 builder.add( RequiredExpr() ); |
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249 RequiredMatch( "%>" ); |
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250 } else if( parser.match( "<%" ) ) { |
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251 Spaces(); |
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252 return parser.success(builder.build()); |
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253 } else { |
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254 int i = parser.currentIndex(); |
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255 do { |
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256 if( parser.match( "%>" ) ) |
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257 throw parser.exception("'%>' unexpected"); |
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258 if( !parser.anyChar() ) |
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259 throw parser.exception("Unclosed JSP expressions"); |
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260 } while( !parser.test( "<%" ) ); |
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261 String match = parser.textFrom(i); |
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262 builder.add( new ConstExpr(match) ); |
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263 } |
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264 } |
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265 } |
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266 |
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267 private Stmt ReturnStmt() throws ParseException { |
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268 int start = parser.begin(); |
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269 if( !Keyword("return") ) |
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270 return parser.failure(null); |
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271 Expressions exprs = ExpList(); |
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272 if( exprs==null ) |
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273 exprs = ExpList.emptyExpList; |
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274 return parser.success( new ReturnStmt(se(start),exprs) ); |
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275 } |
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276 |
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277 private Stmt FunctionStmt() throws ParseException { |
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278 parser.begin(); |
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279 if( !Keyword("function") ) |
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280 return parser.failure(null); |
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281 |
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282 int start = parser.currentIndex(); |
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283 Var var = nameVar(start,RequiredName()); |
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284 while( parser.match( '.' ) ) { |
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285 Spaces(); |
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286 var = indexVar( start, expr(var.expr()), NameExpr(false) ); |
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287 } |
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288 Settable fnName = var.settable(); |
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289 |
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290 FnDef fnDef = RequiredFunction(false); |
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291 return parser.success( new SetStmt(fnName,fnDef) ); |
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292 } |
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293 |
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294 private Stmt LocalFunctionStmt() throws ParseException { |
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295 parser.begin(); |
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296 if( !(Keyword("local") && Keyword("function")) ) |
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297 return parser.failure(null); |
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298 String name = RequiredName(); |
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299 addSymbol( name ); |
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300 FnDef fnDef = RequiredFunction(false); |
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301 return parser.success( new SetStmt( new SetLocalVar(symbolsSize()-1), fnDef ) ); |
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302 } |
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303 |
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304 private Stmt ImportStmt() throws ParseException { |
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305 int start = parser.begin(); |
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306 if( !Keyword("import") ) |
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307 return parser.failure(null); |
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308 Expr importExpr = new ConstExpr(se(start),PackageLib.require); |
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309 String modName = StringLiteral(false); |
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310 if( modName==null ) |
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311 return parser.failure(null); |
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312 String varName = modName.substring(modName.lastIndexOf('.')+1); |
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313 LuanSource.Element se = se(start); |
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314 FnCall require = new FnCall( se, importExpr, new ExpList.SingleExpList(new ConstExpr(modName)) ); |
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315 Settable settable; |
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316 if( interactive ) { |
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317 settable = new SetTableEntry( se(start), env(), new ConstExpr(varName) ); |
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318 } else { |
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319 addSymbol( varName ); |
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320 settable = new SetLocalVar(symbolsSize()-1); |
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321 } |
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322 return parser.success( new SetStmt( settable, expr(require) ) ); |
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323 } |
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324 |
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325 private Stmt BreakStmt() throws ParseException { |
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326 parser.begin(); |
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327 if( !Keyword("break") ) |
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328 return parser.failure(null); |
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329 if( frame.loops <= 0 ) |
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330 throw parser.exception("'break' outside of loop"); |
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331 return parser.success( new BreakStmt() ); |
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332 } |
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333 |
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334 private Stmt GenericForStmt() throws ParseException { |
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335 int start = parser.begin(); |
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336 int stackStart = symbolsSize(); |
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337 if( !Keyword("for") ) |
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338 return parser.failure(null); |
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339 List<String> names = RequiredNameList(false); |
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340 if( !Keyword("in") ) |
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341 return parser.failure(null); |
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342 Expr expr = expr(RequiredExpr()); |
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343 RequiredKeyword("do"); |
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344 addSymbols(names); |
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345 Stmt loop = RequiredLoopBlock(); |
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346 RequiredKeyword("end"); |
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347 Stmt stmt = new GenericForStmt( se(start), stackStart, symbolsSize() - stackStart, expr, loop ); |
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348 popSymbols( symbolsSize() - stackStart ); |
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349 return parser.success(stmt); |
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350 } |
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351 |
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352 private Stmt TryStmt() throws ParseException { |
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353 parser.begin(); |
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354 if( !Keyword("try") ) |
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355 return parser.failure(null); |
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356 Stmt tryBlock = RequiredBlock(); |
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357 RequiredKeyword("catch"); |
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358 String name = RequiredName(); |
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359 addSymbol(name); |
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360 RequiredKeyword("do"); |
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361 Stmt catchBlock = RequiredBlock(); |
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362 RequiredKeyword("end"); |
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363 Stmt stmt = new TryStmt( tryBlock, symbolsSize()-1, catchBlock ); |
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364 popSymbols(1); |
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365 return parser.success(stmt); |
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366 } |
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367 |
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368 private Stmt DoStmt() throws ParseException { |
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369 parser.begin(); |
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370 if( !Keyword("do") ) |
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371 return parser.failure(null); |
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372 Stmt stmt = RequiredBlock(); |
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373 RequiredKeyword("end"); |
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374 return parser.success(stmt); |
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375 } |
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376 |
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377 private boolean LocalStmt(List<Stmt> stmts) throws ParseException { |
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378 parser.begin(); |
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379 if( !Keyword("local") ) |
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380 return parser.failure(); |
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381 List<String> names = NameList(false); |
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382 if( names==null ) |
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383 return parser.failure(); |
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384 if( parser.match( '=' ) ) { |
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385 Spaces(); |
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386 Expressions values = ExpList(); |
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387 if( values==null ) |
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388 throw parser.exception("Expressions expected"); |
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389 SetLocalVar[] vars = new SetLocalVar[names.size()]; |
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390 int stackStart = symbolsSize(); |
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391 for( int i=0; i<vars.length; i++ ) { |
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392 vars[i] = new SetLocalVar(stackStart+i); |
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393 } |
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394 stmts.add( new SetStmt( vars, values ) ); |
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395 } |
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396 addSymbols(names); |
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397 return parser.success(); |
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398 } |
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399 |
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400 private List<String> RequiredNameList(boolean inParens) throws ParseException { |
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401 parser.begin(); |
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402 List<String> names = NameList(inParens); |
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403 if( names==null ) |
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404 parser.exception("Name expected"); |
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405 return parser.success(names); |
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406 } |
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407 |
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408 private List<String> NameList(boolean inParens) throws ParseException { |
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409 String name = Name(inParens); |
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410 if( name==null ) |
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411 return null; |
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412 List<String> names = new ArrayList<String>(); |
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413 names.add(name); |
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414 while( parser.match( ',' ) ) { |
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415 Spaces(inParens); |
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416 names.add( RequiredName() ); |
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417 } |
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418 return names; |
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419 } |
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420 |
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421 private Stmt WhileStmt() throws ParseException { |
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422 parser.begin(); |
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423 if( !Keyword("while") ) |
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424 return parser.failure(null); |
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425 Expr cnd = expr(RequiredExpr()); |
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426 RequiredKeyword("do"); |
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427 Stmt loop = RequiredLoopBlock(); |
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428 RequiredKeyword("end"); |
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429 return parser.success( new WhileStmt(cnd,loop) ); |
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430 } |
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431 |
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432 private Stmt RepeatStmt() throws ParseException { |
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433 parser.begin(); |
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434 if( !Keyword("repeat") ) |
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435 return parser.failure(null); |
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436 Stmt loop = RequiredLoopBlock(); |
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437 RequiredKeyword("until"); |
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438 Expr cnd = expr(RequiredExpr()); |
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439 return parser.success( new RepeatStmt(loop,cnd) ); |
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440 } |
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441 |
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442 private Stmt RequiredLoopBlock() throws ParseException { |
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443 incLoops(); |
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444 Stmt stmt = RequiredBlock(); |
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445 decLoops(); |
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446 return stmt; |
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447 } |
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448 |
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449 private Stmt IfStmt() throws ParseException { |
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450 parser.begin(); |
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451 if( !Keyword("if") ) |
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452 return parser.failure(null); |
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453 return parser.success( IfStmt2() ); |
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454 } |
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455 |
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456 private Stmt IfStmt2() throws ParseException { |
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457 Expr cnd = expr(RequiredExpr()); |
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458 RequiredKeyword("then"); |
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459 Stmt thenBlock = RequiredBlock(); |
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460 Stmt elseBlock; |
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461 if( Keyword("elseif") ) { |
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462 elseBlock = IfStmt2(); |
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463 } else { |
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464 elseBlock = Keyword("else") ? RequiredBlock() : Stmt.EMPTY; |
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465 RequiredKeyword("end"); |
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466 } |
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467 return new IfStmt(cnd,thenBlock,elseBlock); |
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468 } |
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469 |
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470 private Stmt SetStmt() throws ParseException { |
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471 parser.begin(); |
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472 List<Settable> vars = new ArrayList<Settable>(); |
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473 Settable s = SettableVar(); |
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474 if( s == null ) |
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475 return parser.failure(null); |
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476 vars.add(s); |
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477 while( parser.match( ',' ) ) { |
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478 Spaces(); |
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479 s = SettableVar(); |
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480 if( s == null ) |
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481 return parser.failure(null); |
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482 vars.add(s); |
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483 } |
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484 if( !parser.match( '=' ) ) |
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485 return parser.failure(null); |
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486 Spaces(); |
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487 Expressions values = ExpList(); |
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488 if( values==null ) |
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489 throw parser.exception("Expressions expected"); |
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490 return parser.success( new SetStmt( vars.toArray(new Settable[0]), values ) ); |
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491 } |
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492 |
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493 private Stmt ExpressionsStmt() throws ParseException { |
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494 parser.begin(); |
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495 Expressions exprs = ExpList(); |
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496 if( exprs==null ) |
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497 return parser.failure(null); |
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498 return parser.success( new ExpressionsStmt(exprs) ); |
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499 } |
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500 |
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501 private Settable SettableVar() throws ParseException { |
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502 int start = parser.begin(); |
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503 Var var = VarZ(false); |
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504 if( var==null ) |
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505 return null; |
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506 return var.settable(); |
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507 } |
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508 |
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509 private Code RequiredExpr() throws ParseException { |
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510 return RequiredExpr(false); |
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511 } |
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512 |
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513 private Code Expr() throws ParseException { |
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514 return Expr(false); |
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515 } |
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516 |
107
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517 private Code RequiredExpr(boolean inParens) throws ParseException { |
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518 parser.begin(); |
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519 return parser.success(required(Expr(inParens),"Bad expression")); |
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520 } |
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521 |
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522 private Code Expr(boolean inParens) throws ParseException { |
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523 parser.begin(); |
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524 Code exp; |
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525 return (exp = VarArgs(inParens)) != null |
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526 || (exp = JspExpressions()) != null |
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527 || (exp = OrExpr(inParens)) != null |
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528 ? parser.success(exp) |
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529 : parser.failure((Code)null) |
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530 ; |
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531 } |
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532 |
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533 private Code OrExpr(boolean inParens) throws ParseException { |
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534 int start = parser.begin(); |
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535 Code exp = AndExpr(inParens); |
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536 if( exp==null ) |
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537 return parser.failure(null); |
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538 while( Keyword("or",inParens) ) { |
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539 exp = new OrExpr( se(start), expr(exp), required(expr(AndExpr(inParens))) ); |
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540 } |
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541 return parser.success(exp); |
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542 } |
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543 |
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544 private Code AndExpr(boolean inParens) throws ParseException { |
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545 int start = parser.begin(); |
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546 Code exp = RelExpr(inParens); |
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547 if( exp==null ) |
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548 return parser.failure(null); |
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549 while( Keyword("and",inParens) ) { |
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550 exp = new AndExpr( se(start), expr(exp), required(expr(RelExpr(inParens))) ); |
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551 } |
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552 return parser.success(exp); |
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553 } |
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554 |
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555 private Code RelExpr(boolean inParens) throws ParseException { |
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556 int start = parser.begin(); |
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557 Code exp = ConcatExpr(inParens); |
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558 if( exp==null ) |
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559 return parser.failure(null); |
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560 while(true) { |
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561 if( parser.match("==") ) { |
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562 Spaces(inParens); |
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563 exp = new EqExpr( se(start), expr(exp), required(expr(ConcatExpr(inParens))) ); |
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564 } else if( parser.match("~=") ) { |
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565 Spaces(inParens); |
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566 exp = new NotExpr( se(start), new EqExpr( se(start), expr(exp), required(expr(ConcatExpr(inParens))) ) ); |
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567 } else if( parser.match("<=") ) { |
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568 Spaces(inParens); |
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569 exp = new LeExpr( se(start), expr(exp), required(expr(ConcatExpr(inParens))) ); |
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570 } else if( parser.match(">=") ) { |
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571 Spaces(inParens); |
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572 exp = new LeExpr( se(start), required(expr(ConcatExpr(inParens))), expr(exp) ); |
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573 } else if( parser.match("<") ) { |
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574 Spaces(inParens); |
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575 exp = new LtExpr( se(start), expr(exp), required(expr(ConcatExpr(inParens))) ); |
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576 } else if( parser.match(">") ) { |
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577 Spaces(inParens); |
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578 exp = new LtExpr( se(start), required(expr(ConcatExpr(inParens))), expr(exp) ); |
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579 } else |
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580 break; |
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581 } |
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582 return parser.success(exp); |
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583 } |
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584 |
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585 private Code ConcatExpr(boolean inParens) throws ParseException { |
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586 int start = parser.begin(); |
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587 Code exp = SumExpr(inParens); |
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588 if( exp==null ) |
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589 return parser.failure(null); |
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590 if( parser.match("..") ) { |
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591 Spaces(inParens); |
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592 exp = new ConcatExpr( se(start), expr(exp), required(expr(ConcatExpr(inParens))) ); |
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593 } |
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594 return parser.success(exp); |
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595 } |
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596 |
107
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597 private Code SumExpr(boolean inParens) throws ParseException { |
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598 int start = parser.begin(); |
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599 Code exp = TermExpr(inParens); |
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600 if( exp==null ) |
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601 return parser.failure(null); |
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602 while(true) { |
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603 if( parser.match('+') ) { |
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604 Spaces(inParens); |
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605 exp = new AddExpr( se(start), expr(exp), required(expr(TermExpr(inParens))) ); |
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606 } else if( Minus() ) { |
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607 Spaces(inParens); |
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608 exp = new SubExpr( se(start), expr(exp), required(expr(TermExpr(inParens))) ); |
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609 } else |
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610 break; |
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611 } |
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612 return parser.success(exp); |
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613 } |
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614 |
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615 private boolean Minus() { |
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616 parser.begin(); |
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617 return parser.match('-') && !parser.match('-') ? parser.success() : parser.failure(); |
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618 } |
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619 |
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620 private Code TermExpr(boolean inParens) throws ParseException { |
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621 int start = parser.begin(); |
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622 Code exp = UnaryExpr(inParens); |
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623 if( exp==null ) |
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624 return parser.failure(null); |
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625 while(true) { |
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626 if( parser.match('*') ) { |
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627 Spaces(inParens); |
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628 exp = new MulExpr( se(start), expr(exp), required(expr(UnaryExpr(inParens))) ); |
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629 } else if( parser.match('/') ) { |
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630 Spaces(inParens); |
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631 exp = new DivExpr( se(start), expr(exp), required(expr(UnaryExpr(inParens))) ); |
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632 } else if( Mod() ) { |
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633 Spaces(inParens); |
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634 exp = new ModExpr( se(start), expr(exp), required(expr(UnaryExpr(inParens))) ); |
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635 } else |
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636 break; |
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637 } |
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638 return parser.success(exp); |
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639 } |
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640 |
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641 private boolean Mod() { |
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642 parser.begin(); |
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643 return parser.match('%') && !parser.match('>') ? parser.success() : parser.failure(); |
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644 } |
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645 |
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646 private Code UnaryExpr(boolean inParens) throws ParseException { |
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647 int start = parser.begin(); |
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648 if( parser.match('#') ) { |
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649 Spaces(inParens); |
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650 return parser.success( new LenExpr( se(start), required(expr(UnaryExpr(inParens))) ) ); |
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651 } |
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652 if( Minus() ) { |
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653 Spaces(inParens); |
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654 return parser.success( new UnmExpr( se(start), required(expr(UnaryExpr(inParens))) ) ); |
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655 } |
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656 if( Keyword("not",inParens) ) { |
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657 Spaces(inParens); |
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658 return parser.success( new NotExpr( se(start), required(expr(UnaryExpr(inParens))) ) ); |
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659 } |
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660 Code exp = PowExpr(inParens); |
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661 if( exp==null ) |
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662 return parser.failure(null); |
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663 return parser.success(exp); |
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664 } |
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665 |
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666 private Code PowExpr(boolean inParens) throws ParseException { |
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667 int start = parser.begin(); |
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668 Code exp = SingleExpr(inParens); |
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669 if( exp==null ) |
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670 return parser.failure(null); |
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671 if( parser.match('^') ) { |
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672 Spaces(inParens); |
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673 exp = new ConcatExpr( se(start), expr(exp), required(expr(PowExpr(inParens))) ); |
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674 } |
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675 return parser.success(exp); |
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676 } |
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677 |
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678 private Code SingleExpr(boolean inParens) throws ParseException { |
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679 parser.begin(); |
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680 Code exp; |
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681 exp = FunctionExpr(inParens); |
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682 if( exp != null ) |
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683 return parser.success(exp); |
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684 exp = TableExpr(inParens); |
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685 if( exp != null ) |
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686 return parser.success(exp); |
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687 exp = VarExp(inParens); |
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688 if( exp != null ) |
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689 return parser.success(exp); |
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690 exp = Literal(inParens); |
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691 if( exp != null ) |
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692 return parser.success(exp); |
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693 return parser.failure(null); |
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694 } |
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695 |
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696 private Expr FunctionExpr(boolean inParens) throws ParseException { |
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697 if( !Keyword("function",inParens) ) |
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698 return null; |
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699 return RequiredFunction(inParens); |
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700 } |
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701 |
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702 private FnDef RequiredFunction(boolean inParens) throws ParseException { |
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703 int start = parser.begin(); |
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704 RequiredMatch('('); |
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705 Spaces(true); |
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706 frame = new Frame(frame); |
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707 List<String> names = NameList(false); |
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708 if( names != null ) { |
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709 addSymbols(names); |
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710 if( parser.match(',') ) { |
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711 Spaces(true); |
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712 if( !parser.match("...") ) |
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713 throw parser.exception(); |
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714 frame.isVarArg = true; |
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715 } |
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716 } else if( parser.match("...") ) { |
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717 Spaces(true); |
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718 frame.isVarArg = true; |
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719 } |
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720 RequiredMatch(')'); |
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721 Spaces(inParens); |
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722 Stmt block = RequiredBlock(); |
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723 RequiredKeyword("end",inParens); |
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724 FnDef fnDef = newFnDef(start,block); |
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725 frame = frame.parent; |
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726 return parser.success(fnDef); |
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727 } |
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728 |
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729 private VarArgs VarArgs(boolean inParens) throws ParseException { |
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730 int start = parser.begin(); |
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731 if( !frame.isVarArg || !parser.match("...") ) |
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732 return parser.failure(null); |
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733 Spaces(inParens); |
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734 return parser.success( new VarArgs(se(start)) ); |
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735 } |
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736 |
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737 private Expr TableExpr(boolean inParens) throws ParseException { |
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738 int start = parser.begin(); |
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739 if( !parser.match('{') ) |
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740 return parser.failure(null); |
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741 Spaces(true); |
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742 List<TableExpr.Field> fields = new ArrayList<TableExpr.Field>(); |
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743 ExpList.Builder builder = new ExpList.Builder(); |
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744 while( Field(fields,builder) && FieldSep() ); |
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745 if( !parser.match('}') ) |
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746 throw parser.exception("Expected table element or '}'"); |
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747 return parser.success( new TableExpr( se(start), fields.toArray(new TableExpr.Field[0]), builder.build() ) ); |
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748 } |
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749 |
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750 private boolean FieldSep() throws ParseException { |
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751 if( !parser.anyOf(",;") ) |
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752 return false; |
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753 Spaces(true); |
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754 return true; |
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755 } |
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756 |
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757 private boolean Field(List<TableExpr.Field> fields,ExpList.Builder builder) throws ParseException { |
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758 parser.begin(); |
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759 Expr exp = SubExpr(true); |
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760 if( exp==null ) |
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761 exp = NameExpr(true); |
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762 if( exp!=null && parser.match('=') ) { |
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763 fields.add( new TableExpr.Field( exp, required(expr(Expr(true))) ) ); |
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764 return parser.success(); |
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765 } |
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766 parser.rollback(); |
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767 Code code = Expr(true); |
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768 if( code != null ) { |
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769 builder.add(code); |
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770 return parser.success(); |
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771 } |
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772 return parser.failure(); |
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773 } |
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774 |
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775 private Code VarExp(boolean inParens) throws ParseException { |
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776 Var var = VarZ(inParens); |
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777 return var==null ? null : var.expr(); |
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778 } |
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779 |
104
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780 private Var VarZ(boolean inParens) throws ParseException { |
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781 int start = parser.begin(); |
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782 Var var = VarStart(inParens); |
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783 if( var==null ) |
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784 return parser.failure(null); |
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785 Var var2; |
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786 while( (var2=Var2(inParens,start,var.expr())) != null ) { |
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787 var = var2; |
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788 } |
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789 return parser.success(var); |
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790 } |
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791 |
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792 private Var Var2(boolean inParens,int start,Code exp1) throws ParseException { |
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793 Var var = VarExt(inParens,start,exp1); |
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794 if( var != null ) |
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795 return var; |
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796 if( parser.match("->") ) { |
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797 Spaces(inParens); |
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798 ExpList.Builder builder = new ExpList.Builder(); |
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799 builder.add(exp1); |
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800 Expr exp2 = expr(RequiredVarExpB(inParens)); |
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801 FnCall fnCall = required(Args( inParens, start, exp2, builder )); |
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802 return exprVar(fnCall); |
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803 } |
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804 FnCall fnCall = Args( inParens, start, expr(exp1), new ExpList.Builder() ); |
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805 if( fnCall != null ) |
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806 return exprVar(fnCall); |
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807 return null; |
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808 } |
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809 |
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810 private Code RequiredVarExpB(boolean inParens) throws ParseException { |
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811 int start = parser.begin(); |
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812 Var var = required(VarStart(inParens)); |
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813 Var var2; |
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814 while( (var2=VarExt(inParens,start,var.expr())) != null ) { |
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815 var = var2; |
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816 } |
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817 return parser.success(var.expr()); |
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818 } |
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819 |
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820 private Var VarExt(boolean inParens,int start,Code exp1) throws ParseException { |
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821 parser.begin(); |
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822 Expr exp2 = SubExpr(inParens); |
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823 if( exp2 != null ) |
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824 return parser.success(indexVar(start,expr(exp1),exp2)); |
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825 if( parser.match('.') ) { |
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826 Spaces(inParens); |
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827 exp2 = NameExpr(inParens); |
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828 if( exp2!=null ) |
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829 return parser.success(indexVar(start,expr(exp1),exp2)); |
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830 } |
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831 return parser.failure(null); |
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832 } |
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833 |
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834 private Var VarStart(boolean inParens) throws ParseException { |
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835 int start = parser.begin(); |
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836 if( parser.match('(') ) { |
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837 Spaces(true); |
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838 Expr exp = expr(Expr(true)); |
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839 RequiredMatch(')'); |
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840 Spaces(inParens); |
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841 return parser.success(exprVar(exp)); |
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842 } |
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843 String name = Name(inParens); |
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844 if( name != null ) |
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845 return parser.success(nameVar(start,name)); |
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846 return parser.failure(null); |
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847 } |
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848 |
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849 private Expr env() { |
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850 int index = stackIndex(_ENV); |
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851 if( index != -1 ) |
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852 return new GetLocalVar(null,index); |
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853 index = upValueIndex(_ENV); |
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854 if( index != -1 ) |
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855 return new GetUpVar(null,index); |
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856 throw new RuntimeException("_ENV not found"); |
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857 } |
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858 |
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859 private interface Var { |
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860 public Code expr(); |
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861 public Settable settable(); |
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862 } |
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863 |
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864 private Var nameVar(final int start,final String name) { |
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865 return new Var() { |
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866 |
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867 public Expr expr() { |
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868 int index = stackIndex(name); |
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869 if( index != -1 ) |
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870 return new GetLocalVar(se(start),index); |
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871 index = upValueIndex(name); |
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872 if( index != -1 ) |
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873 return new GetUpVar(se(start),index); |
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874 return new IndexExpr( se(start), env(), new ConstExpr(name) ); |
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875 } |
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876 |
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877 public Settable settable() { |
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878 int index = stackIndex(name); |
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879 if( index != -1 ) |
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880 return new SetLocalVar(index); |
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881 index = upValueIndex(name); |
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882 if( index != -1 ) |
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883 return new SetUpVar(index); |
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884 return new SetTableEntry( se(start), env(), new ConstExpr(name) ); |
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885 } |
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886 }; |
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887 } |
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888 |
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889 private Var exprVar(final Code expr) { |
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890 return new Var() { |
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891 |
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892 public Code expr() { |
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893 return expr; |
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894 } |
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895 |
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896 public Settable settable() { |
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897 return null; |
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898 } |
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899 }; |
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900 } |
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901 |
104
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902 private Var indexVar(final int start,final Expr table,final Expr key) { |
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903 return new Var() { |
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904 |
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905 public Expr expr() { |
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906 return new IndexExpr( se(start), table, key ); |
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907 } |
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908 |
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909 public Settable settable() { |
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910 return new SetTableEntry(se(start),table,key); |
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911 } |
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912 }; |
9
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913 } |
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914 |
104
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915 private FnCall Args(boolean inParens,int start,Expr fn,ExpList.Builder builder) throws ParseException { |
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916 parser.begin(); |
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917 return args(inParens,builder) |
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918 ? parser.success( new FnCall( se(start), fn, builder.build() ) ) |
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919 : parser.failure((FnCall)null); |
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920 } |
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921 |
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922 private boolean args(boolean inParens,ExpList.Builder builder) throws ParseException { |
104
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923 if( parser.match('(') ) { |
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924 Spaces(true); |
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925 ExpList(true,builder); // optional |
107
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926 if( !parser.match(')') ) |
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927 throw parser.exception("Expression or ')' expected"); |
104
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928 Spaces(inParens); |
107
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929 return true; |
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930 } |
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931 Expr exp = TableExpr(inParens); |
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932 if( exp != null ) { |
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933 builder.add(exp); |
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934 return true; |
104
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935 } |
107
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936 String s = StringLiteral(inParens); |
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937 if( s != null ) { |
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938 builder.add( new ConstExpr(s) ); |
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939 return true; |
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940 } |
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941 Expressions exps = JspExpressions(); |
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942 if( exps != null ) { |
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943 builder.add(exps); |
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944 return true; |
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945 } |
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946 return false; |
11
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947 } |
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948 |
104
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949 private Expressions ExpList() throws ParseException { |
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950 return ExpList(false); |
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951 } |
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952 |
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953 private Expressions ExpList(boolean inParens) throws ParseException { |
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954 ExpList.Builder builder = new ExpList.Builder(); |
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955 return ExpList(inParens,builder) ? builder.build() : null; |
82
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956 } |
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957 |
104
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958 private boolean ExpList(boolean inParens,ExpList.Builder builder) throws ParseException { |
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959 parser.begin(); |
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960 Code exp = Expr(inParens); |
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961 if( exp==null ) |
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962 return parser.failure(); |
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963 builder.add(exp); |
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964 while( parser.match(',') ) { |
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965 Spaces(inParens); |
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966 builder.add( RequiredExpr(inParens) ); |
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967 } |
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968 return parser.success(); |
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969 } |
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970 |
104
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971 private Expr SubExpr(boolean inParens) throws ParseException { |
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972 parser.begin(); |
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973 if( !parser.match('[') ) |
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974 return parser.failure(null); |
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975 Spaces(true); |
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976 Expr exp = expr(RequiredExpr(true)); |
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977 RequiredMatch(']'); |
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978 Spaces(inParens); |
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979 return parser.success(exp); |
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980 } |
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981 |
104
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982 private Expr NameExpr(boolean inParens) throws ParseException { |
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983 String name = Name(inParens); |
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984 return name==null ? null : new ConstExpr(name); |
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985 } |
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986 |
104
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987 private String RequiredName() throws ParseException { |
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988 parser.begin(); |
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989 String name = Name(); |
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990 if( name==null ) |
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991 parser.exception("Name expected"); |
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992 return parser.success(name); |
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993 } |
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994 |
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995 private String Name() throws ParseException { |
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996 return Name(false); |
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997 } |
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998 |
104
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999 private String Name(boolean inParens) throws ParseException { |
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1000 int start = parser.begin(); |
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1001 if( !NameFirstChar() ) |
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1002 return parser.failure(null); |
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1003 while( NameChar() ); |
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1004 String match = parser.textFrom(start); |
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1005 if( keywords.contains(match) ) |
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1006 return parser.failure(null); |
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1007 Spaces(inParens); |
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1008 return parser.success(match); |
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1009 } |
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1010 |
104
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1011 private boolean NameChar() { |
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1012 return NameFirstChar() || Digit(); |
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1013 } |
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1014 |
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1015 private boolean NameFirstChar() { |
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1016 return parser.inCharRange('a', 'z') || parser.inCharRange('A', 'Z') || parser.match('_'); |
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1017 } |
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1018 |
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1019 private void RequiredMatch(char c) throws ParseException { |
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1020 if( !parser.match(c) ) |
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1021 throw parser.exception("'"+c+"' expected"); |
9
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1022 } |
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1023 |
104
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1024 private void RequiredMatch(String s) throws ParseException { |
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1025 if( !parser.match(s) ) |
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1026 throw parser.exception("'"+s+"' expected"); |
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1027 } |
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1028 |
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1029 private void RequiredKeyword(String keyword) throws ParseException { |
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1030 RequiredKeyword(keyword,false); |
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1031 } |
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1032 |
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1033 private boolean Keyword(String keyword) throws ParseException { |
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1034 return Keyword(keyword,false); |
17
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1035 } |
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1036 |
104
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1037 private void RequiredKeyword(String keyword,boolean inParens) throws ParseException { |
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1038 if( !Keyword(keyword,inParens) ) |
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1039 throw parser.exception("'"+keyword+"' expected"); |
9
600676034a1a
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1040 } |
600676034a1a
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1041 |
104
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1042 private boolean Keyword(String keyword,boolean inParens) throws ParseException { |
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1043 parser.begin(); |
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1044 if( !parser.match(keyword) || NameChar() ) |
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1045 return parser.failure(); |
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|
1046 Spaces(inParens); |
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1047 return parser.success(); |
12
9cea1aea5eef
CmdLine can run files
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1048 } |
9cea1aea5eef
CmdLine can run files
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1049 |
104
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1050 private static final Set<String> keywords = new HashSet<String>(Arrays.asList( |
12
9cea1aea5eef
CmdLine can run files
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|
1051 "and", |
9cea1aea5eef
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|
1052 "break", |
42
786699c78837
implement try-catch
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1053 "catch", |
12
9cea1aea5eef
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|
1054 "do", |
9cea1aea5eef
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1055 "else", |
9cea1aea5eef
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|
1056 "elseif", |
9cea1aea5eef
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1057 "end", |
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|
1058 "false", |
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1059 "for", |
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|
1060 "function", |
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CmdLine can run files
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1061 "goto", |
9cea1aea5eef
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1062 "if", |
108
3c404a296995
make Package module more standard;
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diff
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|
1063 "import", |
12
9cea1aea5eef
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1064 "in", |
9cea1aea5eef
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1065 "local", |
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1066 "nil", |
9cea1aea5eef
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1067 "not", |
9cea1aea5eef
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1068 "or", |
9cea1aea5eef
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1069 "repeat", |
9cea1aea5eef
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1070 "return", |
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1071 "then", |
9cea1aea5eef
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|
1072 "true", |
42
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|
1073 "try", |
12
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1074 "until", |
9cea1aea5eef
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1075 "while" |
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1076 )); |
9cea1aea5eef
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1077 |
104
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1078 private Expr Literal(boolean inParens) throws ParseException { |
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1079 if( NilLiteral(inParens) ) |
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1080 return new ConstExpr(null); |
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1081 Boolean b = BooleanLiteral(inParens); |
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1082 if( b != null ) |
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1083 return new ConstExpr(b); |
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1084 Number n = NumberLiteral(inParens); |
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1085 if( n != null ) |
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1086 return new ConstExpr(n); |
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1087 String s = StringLiteral(inParens); |
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1088 if( s != null ) |
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1089 return new ConstExpr(s); |
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1090 return null; |
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1091 } |
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1092 |
104
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1093 private boolean NilLiteral(boolean inParens) throws ParseException { |
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1094 return Keyword("nil",inParens); |
65
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1095 } |
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1096 |
104
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1097 private Boolean BooleanLiteral(boolean inParens) throws ParseException { |
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1098 if( Keyword("true",inParens) ) |
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1099 return true; |
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1100 if( Keyword("false",inParens) ) |
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1101 return false; |
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1102 return null; |
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1103 } |
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1104 |
104
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1105 private Number NumberLiteral(boolean inParens) throws ParseException { |
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1106 parser.begin(); |
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1107 Number n; |
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1108 if( parser.matchIgnoreCase("0x") ) { |
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1109 n = HexNumber(); |
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1110 } else { |
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1111 n = DecNumber(); |
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1112 } |
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1113 if( n==null || NameChar() ) |
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1114 return parser.failure(null); |
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1115 Spaces(inParens); |
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1116 return parser.success(n); |
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1117 } |
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1118 |
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1119 private Number DecNumber() { |
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1120 int start = parser.begin(); |
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1121 if( Int() ) { |
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1122 if( parser.match('.') ) |
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1123 Int(); // optional |
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1124 } else if( parser.match('.') && Int() ) { |
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1125 // ok |
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1126 } else |
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1127 return parser.failure(null); |
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1128 Exponent(); // optional |
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1129 return parser.success(Double.valueOf(parser.textFrom(start))); |
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1130 } |
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1131 |
104
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1132 private boolean Exponent() { |
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1133 parser.begin(); |
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1134 if( !parser.matchIgnoreCase("e") ) |
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1135 return parser.failure(); |
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1136 parser.anyOf("+-"); // optional |
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1137 if( !Int() ) |
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1138 return parser.failure(); |
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1139 return parser.success(); |
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1140 } |
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1141 |
104
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1142 private boolean Int() { |
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1143 if( !Digit() ) |
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1144 return false; |
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1145 while( Digit() ); |
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1146 return true; |
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1147 } |
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1148 |
104
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1149 private boolean Digit() { |
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1150 return parser.inCharRange('0', '9'); |
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1151 } |
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1152 |
104
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1153 private Number HexNumber() { |
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1154 int start = parser.begin(); |
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1155 double n; |
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1156 if( HexInt() ) { |
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1157 n = (double)Long.parseLong(parser.textFrom(start),16); |
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1158 if( parser.match('.') ) { |
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1159 start = parser.currentIndex(); |
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1160 if( HexInt() ) { |
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1161 String dec = parser.textFrom(start); |
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1162 n += (double)Long.parseLong(dec,16) / Math.pow(16,dec.length()); |
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1163 } |
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1164 } |
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1165 } else if( parser.match('.') && HexInt() ) { |
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1166 String dec = parser.textFrom(start+1); |
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1167 n = (double)Long.parseLong(dec,16) / Math.pow(16,dec.length()); |
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1168 } else { |
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1169 return parser.failure(null); |
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1170 } |
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1171 if( parser.matchIgnoreCase("p") ) { |
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1172 parser.anyOf("+-"); // optional |
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1173 start = parser.currentIndex(); |
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1174 if( !HexInt() ) |
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1175 return parser.failure(null); |
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1176 n *= Math.pow(2,(double)Long.parseLong(parser.textFrom(start))); |
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1177 } |
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1178 return parser.success(Double.valueOf(n)); |
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1179 } |
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1180 |
104
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1181 private boolean HexInt() { |
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1182 if( !HexDigit() ) |
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1183 return false; |
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1184 while( HexDigit() ); |
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1185 return true; |
16
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1186 } |
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1187 |
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1188 |
104
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1189 private boolean HexDigit() { |
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1190 return Digit() || parser.anyOf("abcdefABCDEF"); |
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1191 } |
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1192 |
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1193 private String StringLiteral(boolean inParens) throws ParseException { |
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1194 String s; |
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1195 if( (s=QuotedString('"'))==null |
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1196 && (s=QuotedString('\''))==null |
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1197 && (s=LongString())==null |
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1198 ) |
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1199 return null; |
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1200 Spaces(inParens); |
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1201 return s; |
16
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1202 } |
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1203 |
104
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1204 private String LongString() throws ParseException { |
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1205 parser.begin(); |
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1206 if( !parser.match('[') ) |
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1207 return parser.failure(null); |
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1208 int start = parser.currentIndex(); |
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1209 while( parser.match('=') ); |
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1210 int nEquals = parser.currentIndex() - start; |
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1211 if( !parser.match('[') ) |
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1212 return parser.failure(null); |
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1213 start = parser.currentIndex(); |
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1214 while( !LongBracketsEnd(nEquals) ) { |
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1215 if( !parser.anyChar() ) |
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1216 throw parser.exception("Unclosed long string"); |
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1217 } |
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1218 String s = parser.text.substring( start, parser.currentIndex() - nEquals - 2 ); |
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1219 return parser.success(s); |
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1220 } |
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1221 |
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1222 private String QuotedString(char quote) throws ParseException { |
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1223 parser.begin(); |
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1224 if( !parser.match(quote) ) |
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1225 return parser.failure(null); |
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1226 StringBuilder buf = new StringBuilder(); |
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1227 while( !parser.match(quote) ) { |
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1228 Character c = EscSeq(); |
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1229 if( c != null ) { |
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1230 buf.append(c); |
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1231 } else { |
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1232 if( !parser.anyChar() ) |
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1233 throw parser.exception("Unclosed string"); |
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1234 buf.append(parser.lastChar()); |
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1235 } |
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1236 } |
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1237 return parser.success(buf.toString()); |
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1238 } |
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1239 |
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1240 private Character EscSeq() { |
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1241 parser.begin(); |
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1242 if( !parser.match('\\') ) |
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1243 return parser.failure(null); |
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1244 if( parser.match('a') ) return '\u0007'; |
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1245 if( parser.match('b') ) return '\b'; |
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1246 if( parser.match('f') ) return '\f'; |
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1247 if( parser.match('n') ) return '\n'; |
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1248 if( parser.match('r') ) return '\r'; |
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1249 if( parser.match('t') ) return '\t'; |
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1250 if( parser.match('v') ) return '\u000b'; |
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1251 if( parser.match('\\') ) return '\\'; |
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1252 if( parser.match('"') ) return '"'; |
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1253 if( parser.match('\'') ) return '\''; |
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1254 int start = parser.currentIndex(); |
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1255 if( parser.match('x') && HexDigit() && HexDigit() ) |
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1256 return (char)Integer.parseInt(parser.textFrom(start+1),16); |
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1257 if( Digit() ) { |
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1258 if( Digit() ) Digit(); // optional |
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1259 return (char)Integer.parseInt(parser.textFrom(start)); |
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1260 } |
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1261 return parser.failure(null); |
14
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whitespace handling;
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1262 } |
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1263 |
104
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1264 private void Spaces() throws ParseException { |
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1265 Spaces(false); |
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1266 } |
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1267 |
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1268 private void Spaces(boolean inParens) throws ParseException { |
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1269 while( parser.anyOf(" \t") || Comment() || ContinueOnNextLine() || inParens && NewLine() ); |
14
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1270 } |
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1271 |
104
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1272 private boolean ContinueOnNextLine() { |
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1273 parser.begin(); |
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1274 return parser.match('\\') && EndOfLine() ? parser.success() : parser.failure(); |
7
bca8fc5d928b
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1275 } |
bca8fc5d928b
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1276 |
104
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1277 private boolean NewLine() { |
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1278 if( !EndOfLine() ) |
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1279 return false; |
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1280 if( parser.match("--") ) { |
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1281 while( parser.noneOf("\r\n") ); |
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1282 } |
18
3971113699b8
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1283 return true; |
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1284 } |
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1285 |
104
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1286 private boolean Comment() throws ParseException { |
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1287 parser.begin(); |
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1288 if( !parser.match("--[") ) |
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1289 return parser.failure(); |
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1290 int start = parser.currentIndex(); |
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1291 while( parser.match('=') ); |
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1292 int nEquals = parser.currentIndex() - start; |
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1293 if( !parser.match('[') ) |
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1294 return parser.failure(); |
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1295 while( !LongBracketsEnd(nEquals) ) { |
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1296 if( !parser.anyChar() ) |
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1297 throw parser.exception("Unclosed comment"); |
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1298 } |
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1299 return parser.success(); |
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1300 } |
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1301 |
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1302 private boolean LongBracketsEnd(int nEquals) { |
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1303 parser.begin(); |
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1304 if( !parser.match(']') ) |
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1305 return parser.failure(); |
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1306 while( nEquals-- > 0 ) { |
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1307 if( !parser.match('=') ) |
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1308 return parser.failure(); |
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1309 } |
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1310 if( !parser.match(']') ) |
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1311 return parser.failure(); |
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1312 return parser.success(); |
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1313 } |
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1314 |
5
9ef0fd711101
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1315 } |