Mercurial Hosting > luan
annotate src/luan/interp/LuanParser.java @ 106:1a29dd3888f6
support standard Lua numeric "for" statement
git-svn-id: https://luan-java.googlecode.com/svn/trunk@107 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Mon, 19 May 2014 06:23:18 +0000 |
parents | 754e6030c029 |
children | dbf459397217 |
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1 package luan.interp; |
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2 |
12
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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 |
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15 |
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16 final class LuanParser { |
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17 |
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18 static FnDef parse(LuanSource source,UpValue.Getter envGetter) throws ParseException { |
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19 return new LuanParser(source,envGetter).RequiredTarget(); |
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20 } |
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21 |
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22 private static final class Frame { |
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23 final Frame parent; |
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24 final List<String> symbols = new ArrayList<String>(); |
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25 int stackSize = 0; |
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26 int loops = 0; |
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27 boolean isVarArg = false; |
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28 final List<String> upValueSymbols = new ArrayList<String>(); |
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29 final List<UpValue.Getter> upValueGetters = new ArrayList<UpValue.Getter>(); |
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30 |
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31 Frame(UpValue.Getter envGetter) { |
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32 this.parent = null; |
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33 upValueSymbols.add(_ENV); |
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34 upValueGetters.add(envGetter); |
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35 } |
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36 |
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37 Frame(Frame parent) { |
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38 this.parent = parent; |
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39 if( upValueIndex(_ENV) != 0 ) |
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40 throw new RuntimeException(); |
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41 } |
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42 |
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43 int stackIndex(String name) { |
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44 int i = symbols.size(); |
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45 while( --i >= 0 ) { |
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46 if( symbols.get(i).equals(name) ) |
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47 return i; |
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48 } |
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49 return -1; |
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50 } |
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51 |
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52 int upValueIndex(String name) { |
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53 int i = upValueSymbols.size(); |
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54 while( --i >= 0 ) { |
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55 if( upValueSymbols.get(i).equals(name) ) |
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56 return i; |
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57 } |
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58 if( parent==null ) |
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59 return -1; |
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60 i = parent.stackIndex(name); |
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61 if( i != -1 ) { |
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62 upValueGetters.add(new UpValue.StackGetter(i)); |
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63 } else { |
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64 i = parent.upValueIndex(name); |
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65 if( i == -1 ) |
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66 return -1; |
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67 upValueGetters.add(new UpValue.NestedGetter(i)); |
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68 } |
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69 upValueSymbols.add(name); |
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70 return upValueSymbols.size() - 1; |
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71 } |
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72 } |
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73 |
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74 private static final String _ENV = "_ENV"; |
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75 private static final UpValue.Getter[] NO_UP_VALUE_GETTERS = new UpValue.Getter[0]; |
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76 |
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77 private final LuanSource source; |
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78 private Frame frame; |
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79 private final Parser parser; |
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80 |
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81 private LuanParser(LuanSource source,UpValue.Getter envGetter) { |
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82 this.source = source; |
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83 this.frame = new Frame(envGetter); |
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84 this.parser = new Parser(source.text); |
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85 } |
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86 |
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87 private LuanSource.Element se(int start) { |
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88 return new LuanSource.Element(source,start,parser.currentIndex()); |
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89 } |
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90 |
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91 private List<String> symbols() { |
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92 return frame.symbols; |
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93 } |
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94 |
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95 private int symbolsSize() { |
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96 return frame.symbols.size(); |
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97 } |
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98 |
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99 private void addSymbol(String name) { |
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100 frame.symbols.add(name); |
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101 if( frame.stackSize < symbolsSize() ) |
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102 frame.stackSize = symbolsSize(); |
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103 } |
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104 |
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105 private void addSymbols(List<String> names) { |
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106 frame.symbols.addAll(names); |
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107 if( frame.stackSize < symbolsSize() ) |
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108 frame.stackSize = symbolsSize(); |
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109 } |
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110 |
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111 private int stackIndex(String name) { |
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112 return frame.stackIndex(name); |
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113 } |
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114 |
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115 private void popSymbols(int n) { |
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116 List<String> symbols = frame.symbols; |
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117 while( n-- > 0 ) { |
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118 symbols.remove(symbols.size()-1); |
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119 } |
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120 } |
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121 |
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122 private int upValueIndex(String name) { |
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123 return frame.upValueIndex(name); |
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124 } |
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125 |
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126 private void incLoops() { |
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127 frame.loops++; |
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128 } |
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129 |
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130 private void decLoops() { |
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131 frame.loops--; |
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132 } |
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133 |
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134 private <T> T required(T t) throws ParseException { |
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135 if( t==null ) |
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136 throw parser.exception(); |
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137 return t; |
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138 } |
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139 |
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140 private <T> T required(T t,String msg) throws ParseException { |
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141 if( t==null ) |
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142 throw parser.exception(msg); |
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143 return t; |
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144 } |
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145 |
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146 private FnDef newFnDef(int start,Stmt stmt) { |
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147 return new FnDef( se(start), stmt, frame.stackSize, symbolsSize(), frame.isVarArg, frame.upValueGetters.toArray(NO_UP_VALUE_GETTERS) ); |
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148 } |
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149 |
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150 private FnDef RequiredTarget() throws ParseException { |
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151 Spaces(); |
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152 int start = parser.begin(); |
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153 Expressions exprs = ExpList(); |
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154 if( exprs != null && parser.endOfInput() ) { |
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155 Stmt stmt = new ReturnStmt( se(start), exprs ); |
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156 return parser.success(newFnDef(start,stmt)); |
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157 } |
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158 parser.rollback(); |
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159 frame.isVarArg = true; |
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160 Stmt stmt = RequiredBlock(); |
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161 if( parser.endOfInput() ) |
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162 return parser.success(newFnDef(start,stmt)); |
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163 throw parser.exception(); |
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164 } |
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165 |
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166 private Stmt RequiredBlock() throws ParseException { |
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167 List<Stmt> stmts = new ArrayList<Stmt>(); |
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168 int stackStart = symbolsSize(); |
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169 Stmt(stmts); |
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170 while( StmtSep(stmts) ) { |
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171 Spaces(); |
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172 Stmt(stmts); |
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173 } |
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174 int stackEnd = symbolsSize(); |
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175 popSymbols( stackEnd - stackStart ); |
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176 if( stmts.isEmpty() ) |
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177 return Stmt.EMPTY; |
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178 if( stmts.size()==1 && stackStart==stackEnd ) |
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179 return stmts.get(0); |
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180 return new Block( stmts.toArray(new Stmt[0]), stackStart, stackEnd ); |
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181 } |
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182 |
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183 private boolean StmtSep(List<Stmt> stmts) throws ParseException { |
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184 parser.begin(); |
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185 if( parser.match( ';' ) ) |
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186 return parser.success(); |
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187 if( parser.match( "--" ) ) { |
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188 while( parser.noneOf("\r\n") ); |
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189 EndOfLine(); |
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190 return parser.success(); |
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191 } |
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192 if( EndOfLine() ) |
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193 return parser.success(); |
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194 parser.rollback(); |
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195 Stmt stmt = OutputStmt(); |
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196 if( stmt != null ) { |
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197 stmts.add(stmt); |
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198 return parser.success(); |
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199 } |
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200 return parser.failure(); |
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201 } |
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202 |
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203 private boolean EndOfLine() { |
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204 return parser.match( "\r\n" ) || parser.match( '\r' ) || parser.match( '\n' ); |
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205 } |
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206 |
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207 private void Stmt(List<Stmt> stmts) throws ParseException { |
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208 if( LocalStmt(stmts) ) |
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209 return; |
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210 Stmt stmt; |
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211 if( (stmt=ReturnStmt()) != null |
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212 || (stmt=FunctionStmt()) != null |
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213 || (stmt=LocalFunctionStmt()) != null |
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214 || (stmt=BreakStmt()) != null |
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215 || (stmt=GenericForStmt()) != null |
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216 || (stmt=NumericForStmt()) != null |
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217 || (stmt=TryStmt()) != null |
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218 || (stmt=DoStmt()) != null |
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219 || (stmt=WhileStmt()) != null |
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220 || (stmt=FunctionStmt()) != null |
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221 || (stmt=RepeatStmt()) != null |
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222 || (stmt=IfStmt()) != null |
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223 || (stmt=SetStmt()) != null |
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224 || (stmt=ExpressionsStmt()) != null |
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225 ) { |
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226 stmts.add(stmt); |
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227 } |
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228 } |
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229 |
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230 private Stmt OutputStmt() throws ParseException { |
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231 int start = parser.begin(); |
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232 if( !parser.match( "%>" ) ) |
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233 return parser.failure(null); |
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234 EndOfLine(); |
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235 ExpList.Builder builder = new ExpList.Builder(); |
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236 while(true) { |
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237 if( parser.match( "<%=" ) ) { |
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238 Spaces(); |
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239 builder.add( RequiredExpr() ); |
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240 RequiredMatch( "%>" ); |
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241 } else if( parser.match( "<%" ) ) { |
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242 Spaces(); |
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243 return parser.success(new OutputStmt( se(start), builder.build() )); |
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244 } else { |
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245 int i = parser.currentIndex(); |
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246 do { |
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247 if( parser.match( "%>" ) ) |
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248 throw parser.exception("'%>' unexpected"); |
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249 if( !parser.anyChar() ) |
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250 throw parser.exception("Unclosed output statement"); |
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251 } while( !parser.test( "<%" ) ); |
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252 String match = parser.textFrom(i); |
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253 builder.add( new ConstExpr(match) ); |
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254 } |
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255 } |
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256 } |
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257 |
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258 private Stmt ReturnStmt() throws ParseException { |
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259 int start = parser.begin(); |
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260 if( !Keyword("return") ) |
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261 return parser.failure(null); |
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262 Expressions exprs = ExpList(); |
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263 if( exprs==null ) |
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264 exprs = ExpList.emptyExpList; |
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265 return parser.success( new ReturnStmt(se(start),exprs) ); |
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266 } |
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267 |
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268 private Stmt FunctionStmt() throws ParseException { |
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269 parser.begin(); |
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270 if( !Keyword("function") ) |
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271 return parser.failure(null); |
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272 |
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273 int start = parser.currentIndex(); |
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274 Var var = nameVar(start,RequiredName()); |
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275 while( parser.match( '.' ) ) { |
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276 Spaces(); |
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277 var = indexVar( start, var.expr(), NameExpr(false) ); |
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278 } |
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279 Settable fnName = var.settable(); |
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280 |
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281 FnDef fnDef = RequiredFunction(false); |
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282 return parser.success( new SetStmt(fnName,fnDef) ); |
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283 } |
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284 |
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285 private Stmt LocalFunctionStmt() throws ParseException { |
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286 parser.begin(); |
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287 if( !(Keyword("local") && Keyword("function")) ) |
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288 return parser.failure(null); |
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289 String name = RequiredName(); |
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290 addSymbol( name ); |
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291 FnDef fnDef = RequiredFunction(false); |
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292 return parser.success( new SetStmt( new SetLocalVar(symbolsSize()-1), fnDef ) ); |
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293 } |
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294 |
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295 private Stmt BreakStmt() throws ParseException { |
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296 parser.begin(); |
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297 if( !Keyword("break") ) |
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298 return parser.failure(null); |
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299 if( frame.loops <= 0 ) |
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300 throw parser.exception("'break' outside of loop"); |
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301 return parser.success( new BreakStmt() ); |
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302 } |
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303 |
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304 private Stmt GenericForStmt() throws ParseException { |
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305 int start = parser.begin(); |
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306 int stackStart = symbolsSize(); |
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307 if( !Keyword("for") ) |
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308 return parser.failure(null); |
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309 List<String> names = RequiredNameList(false); |
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310 if( !Keyword("in") ) |
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311 return parser.failure(null); |
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312 Expr expr = RequiredExpr(); |
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313 RequiredKeyword("do"); |
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314 addSymbols(names); |
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315 Stmt loop = RequiredLoopBlock(); |
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316 RequiredKeyword("end"); |
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317 Stmt stmt = new GenericForStmt( se(start), stackStart, symbolsSize() - stackStart, expr, loop ); |
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318 popSymbols( symbolsSize() - stackStart ); |
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319 return parser.success(stmt); |
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320 } |
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321 |
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322 private Stmt NumericForStmt() throws ParseException { |
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323 int start = parser.begin(); |
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324 if( !Keyword("for") ) |
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325 return parser.failure(null); |
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326 String name = RequiredName(); |
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327 RequiredMatch( "=" ); |
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328 Spaces(); |
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329 Expr from = RequiredExpr(); |
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330 Expr to; |
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331 Expr step; |
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332 if( parser.match(',') ) { |
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333 Spaces(); |
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334 to = RequiredExpr(); |
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335 if( parser.match(',') ) { |
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336 Spaces(); |
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337 step = RequiredExpr(); |
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338 } else { |
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339 step = new ConstExpr(1); |
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340 } |
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341 } else { |
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342 RequiredKeyword("to"); |
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343 to = RequiredExpr(); |
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344 step = Keyword("step") ? RequiredExpr() : new ConstExpr(1); |
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345 } |
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346 addSymbol(name); // add "for" var to symbols |
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347 RequiredKeyword("do"); |
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348 Stmt loop = RequiredLoopBlock(); |
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349 RequiredKeyword("end"); |
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350 Stmt stmt = new NumericForStmt( se(start), symbolsSize()-1, from, to, step, loop ); |
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351 popSymbols(1); |
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352 return parser.success(stmt); |
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353 } |
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354 |
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355 private Stmt TryStmt() throws ParseException { |
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356 parser.begin(); |
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357 if( !Keyword("try") ) |
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358 return parser.failure(null); |
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359 Stmt tryBlock = RequiredBlock(); |
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360 RequiredKeyword("catch"); |
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361 String name = RequiredName(); |
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362 addSymbol(name); |
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363 RequiredKeyword("do"); |
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364 Stmt catchBlock = RequiredBlock(); |
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365 RequiredKeyword("end"); |
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366 Stmt stmt = new TryStmt( tryBlock, symbolsSize()-1, catchBlock ); |
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367 popSymbols(1); |
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368 return parser.success(stmt); |
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369 } |
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370 |
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371 private Stmt DoStmt() throws ParseException { |
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372 parser.begin(); |
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373 if( !Keyword("do") ) |
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374 return parser.failure(null); |
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375 Stmt stmt = RequiredBlock(); |
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376 RequiredKeyword("end"); |
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377 return parser.success(stmt); |
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378 } |
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379 |
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380 private boolean LocalStmt(List<Stmt> stmts) throws ParseException { |
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381 parser.begin(); |
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382 if( !Keyword("local") ) |
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383 return parser.failure(); |
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384 List<String> names = NameList(false); |
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385 if( names==null ) |
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386 return parser.failure(); |
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387 if( parser.match( '=' ) ) { |
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388 Spaces(); |
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389 Expressions values = ExpList(); |
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390 if( values==null ) |
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391 throw parser.exception("Expressions expected"); |
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392 SetLocalVar[] vars = new SetLocalVar[names.size()]; |
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393 int stackStart = symbolsSize(); |
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394 for( int i=0; i<vars.length; i++ ) { |
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395 vars[i] = new SetLocalVar(stackStart+i); |
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396 } |
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397 stmts.add( new SetStmt( vars, values ) ); |
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398 } |
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399 addSymbols(names); |
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400 return parser.success(); |
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401 } |
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402 |
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403 private List<String> RequiredNameList(boolean inParens) throws ParseException { |
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404 parser.begin(); |
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405 List<String> names = NameList(inParens); |
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406 if( names==null ) |
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407 parser.exception("Name expected"); |
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408 return parser.success(names); |
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409 } |
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410 |
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411 private List<String> NameList(boolean inParens) throws ParseException { |
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412 String name = Name(inParens); |
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413 if( name==null ) |
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414 return null; |
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415 List<String> names = new ArrayList<String>(); |
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416 names.add(name); |
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417 while( parser.match( ',' ) ) { |
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418 Spaces(inParens); |
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419 names.add( RequiredName() ); |
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420 } |
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421 return names; |
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422 } |
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423 |
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424 private Stmt WhileStmt() throws ParseException { |
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425 parser.begin(); |
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426 if( !Keyword("while") ) |
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427 return parser.failure(null); |
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428 Expr cnd = RequiredExpr(); |
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429 RequiredKeyword("do"); |
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430 Stmt loop = RequiredLoopBlock(); |
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431 RequiredKeyword("end"); |
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432 return parser.success( new WhileStmt(cnd,loop) ); |
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433 } |
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434 |
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435 private Stmt RepeatStmt() throws ParseException { |
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436 parser.begin(); |
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437 if( !Keyword("repeat") ) |
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438 return parser.failure(null); |
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439 Stmt loop = RequiredLoopBlock(); |
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440 RequiredKeyword("until"); |
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441 Expr cnd = RequiredExpr(); |
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442 return parser.success( new RepeatStmt(loop,cnd) ); |
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443 } |
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444 |
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445 private Stmt RequiredLoopBlock() throws ParseException { |
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446 incLoops(); |
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447 Stmt stmt = RequiredBlock(); |
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448 decLoops(); |
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449 return stmt; |
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450 } |
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451 |
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452 private Stmt IfStmt() throws ParseException { |
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453 parser.begin(); |
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454 if( !Keyword("if") ) |
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455 return parser.failure(null); |
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456 return parser.success( IfStmt2() ); |
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457 } |
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458 |
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459 private Stmt IfStmt2() throws ParseException { |
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460 Expr cnd = RequiredExpr(); |
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461 RequiredKeyword("then"); |
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462 Stmt thenBlock = RequiredBlock(); |
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463 Stmt elseBlock; |
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464 if( Keyword("elseif") ) { |
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465 elseBlock = IfStmt2(); |
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466 } else { |
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467 elseBlock = Keyword("else") ? RequiredBlock() : Stmt.EMPTY; |
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468 RequiredKeyword("end"); |
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469 } |
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470 return new IfStmt(cnd,thenBlock,elseBlock); |
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471 } |
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472 |
104
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473 private Stmt SetStmt() throws ParseException { |
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474 parser.begin(); |
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475 List<Settable> vars = new ArrayList<Settable>(); |
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476 Settable s = SettableVar(); |
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477 if( s == null ) |
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478 return parser.failure(null); |
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479 vars.add(s); |
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480 while( parser.match( ',' ) ) { |
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481 Spaces(); |
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482 s = SettableVar(); |
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483 if( s == null ) |
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484 return parser.failure(null); |
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485 vars.add(s); |
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486 } |
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487 if( !parser.match( '=' ) ) |
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488 return parser.failure(null); |
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489 Spaces(); |
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490 Expressions values = ExpList(); |
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491 if( values==null ) |
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492 throw parser.exception("Expressions expected"); |
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493 return parser.success( new SetStmt( vars.toArray(new Settable[0]), values ) ); |
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494 } |
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495 |
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496 private Stmt ExpressionsStmt() throws ParseException { |
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497 parser.begin(); |
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498 Expressions exprs = ExpList(); |
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499 if( exprs==null ) |
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500 return parser.failure(null); |
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501 return parser.success( new ExpressionsStmt(exprs) ); |
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502 } |
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503 |
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504 private Settable SettableVar() throws ParseException { |
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505 int start = parser.begin(); |
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506 Var var = VarZ(false); |
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507 if( var==null ) |
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508 return null; |
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509 return var.settable(); |
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510 } |
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511 |
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512 private Expr RequiredExpr() throws ParseException { |
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513 return RequiredExpr(false); |
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514 } |
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515 |
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516 private Expr Expr() throws ParseException { |
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517 return Expr(false); |
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518 } |
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519 |
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520 private Expr RequiredExpr(boolean inParens) throws ParseException { |
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521 parser.begin(); |
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522 return parser.success(required(Expr(inParens),"Bad expression")); |
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523 } |
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524 |
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525 private Expr Expr(boolean inParens) throws ParseException { |
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526 parser.begin(); |
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527 Expressions exps = VarArgs(inParens); |
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528 if( exps != null ) |
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529 return parser.success( new ExpressionsExpr(exps) ); |
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530 Expr exp = OrExpr(inParens); |
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531 if( exp==null ) |
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532 return parser.failure(null); |
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533 return parser.success(exp); |
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534 } |
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535 |
104
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536 private Expr OrExpr(boolean inParens) throws ParseException { |
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537 int start = parser.begin(); |
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538 Expr exp = AndExpr(inParens); |
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539 if( exp==null ) |
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540 return parser.failure(null); |
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541 while( Keyword("or",inParens) ) { |
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542 exp = new OrExpr( se(start), exp, required(AndExpr(inParens)) ); |
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543 } |
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544 return parser.success(exp); |
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545 } |
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546 |
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547 private Expr AndExpr(boolean inParens) throws ParseException { |
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548 int start = parser.begin(); |
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549 Expr exp = RelExpr(inParens); |
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550 if( exp==null ) |
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551 return parser.failure(null); |
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552 while( Keyword("and",inParens) ) { |
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553 exp = new AndExpr( se(start), exp, required(RelExpr(inParens)) ); |
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554 } |
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555 return parser.success(exp); |
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556 } |
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557 |
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558 private Expr RelExpr(boolean inParens) throws ParseException { |
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559 int start = parser.begin(); |
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560 Expr exp = ConcatExpr(inParens); |
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561 if( exp==null ) |
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562 return parser.failure(null); |
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563 while(true) { |
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564 if( parser.match("==") ) { |
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565 Spaces(inParens); |
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566 exp = new EqExpr( se(start), exp, required(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 NotExpr( se(start), new EqExpr( se(start), exp, required(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), exp, required(ConcatExpr(inParens)) ); |
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573 } else if( parser.match(">=") ) { |
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574 Spaces(inParens); |
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575 exp = new LeExpr( se(start), required(ConcatExpr(inParens)), exp ); |
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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), exp, required(ConcatExpr(inParens)) ); |
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579 } else if( parser.match(">") ) { |
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580 Spaces(inParens); |
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581 exp = new LtExpr( se(start), required(ConcatExpr(inParens)), exp ); |
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582 } else |
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583 break; |
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584 } |
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585 return parser.success(exp); |
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586 } |
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587 |
104
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588 private Expr ConcatExpr(boolean inParens) throws ParseException { |
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589 int start = parser.begin(); |
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590 Expr exp = SumExpr(inParens); |
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591 if( exp==null ) |
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592 return parser.failure(null); |
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593 if( parser.match("..") ) { |
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594 Spaces(inParens); |
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595 exp = new ConcatExpr( se(start), exp, required(ConcatExpr(inParens)) ); |
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596 } |
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597 return parser.success(exp); |
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598 } |
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599 |
104
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600 private Expr SumExpr(boolean inParens) throws ParseException { |
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601 int start = parser.begin(); |
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602 Expr exp = TermExpr(inParens); |
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603 if( exp==null ) |
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604 return parser.failure(null); |
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605 while(true) { |
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606 if( parser.match('+') ) { |
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607 Spaces(inParens); |
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608 exp = new AddExpr( se(start), exp, required(TermExpr(inParens)) ); |
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609 } else if( Minus() ) { |
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610 Spaces(inParens); |
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611 exp = new SubExpr( se(start), exp, required(TermExpr(inParens)) ); |
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612 } else |
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613 break; |
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614 } |
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615 return parser.success(exp); |
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616 } |
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617 |
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618 private boolean Minus() { |
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619 parser.begin(); |
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620 return parser.match('-') && !parser.match('-') ? parser.success() : parser.failure(); |
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9cea1aea5eef
CmdLine can run files
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621 } |
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622 |
104
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623 private Expr TermExpr(boolean inParens) throws ParseException { |
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624 int start = parser.begin(); |
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625 Expr exp = UnaryExpr(inParens); |
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626 if( exp==null ) |
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627 return parser.failure(null); |
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628 while(true) { |
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629 if( parser.match('*') ) { |
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630 Spaces(inParens); |
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631 exp = new MulExpr( se(start), exp, required(UnaryExpr(inParens)) ); |
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632 } else if( parser.match('/') ) { |
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633 Spaces(inParens); |
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634 exp = new DivExpr( se(start), exp, required(UnaryExpr(inParens)) ); |
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635 } else if( parser.match('%') ) { |
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636 Spaces(inParens); |
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637 exp = new ModExpr( se(start), exp, required(UnaryExpr(inParens)) ); |
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638 } else |
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639 break; |
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640 } |
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641 return parser.success(exp); |
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642 } |
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643 |
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644 private Expr UnaryExpr(boolean inParens) throws ParseException { |
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645 int start = parser.begin(); |
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646 if( parser.match('#') ) { |
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647 Spaces(inParens); |
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648 return parser.success( new LenExpr( se(start), required(UnaryExpr(inParens)) ) ); |
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649 } |
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650 if( Minus() ) { |
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651 Spaces(inParens); |
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652 return parser.success( new UnmExpr( se(start), required(UnaryExpr(inParens)) ) ); |
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653 } |
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654 if( Keyword("not",inParens) ) { |
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655 Spaces(inParens); |
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656 return parser.success( new NotExpr( se(start), required(UnaryExpr(inParens)) ) ); |
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657 } |
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658 Expr exp = PowExpr(inParens); |
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659 if( exp==null ) |
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660 return parser.failure(null); |
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661 return parser.success(exp); |
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662 } |
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663 |
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664 private Expr PowExpr(boolean inParens) throws ParseException { |
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665 int start = parser.begin(); |
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666 Expr exp = SingleExpr(inParens); |
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667 if( exp==null ) |
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668 return parser.failure(null); |
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669 if( parser.match('^') ) { |
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670 Spaces(inParens); |
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671 exp = new ConcatExpr( se(start), exp, required(PowExpr(inParens)) ); |
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672 } |
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673 return parser.success(exp); |
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674 } |
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675 |
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676 private Expr SingleExpr(boolean inParens) throws ParseException { |
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677 parser.begin(); |
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678 Expr exp; |
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679 exp = FunctionExpr(inParens); |
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680 if( exp != null ) |
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681 return parser.success(exp); |
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682 exp = TableExpr(inParens); |
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683 if( exp != null ) |
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684 return parser.success(exp); |
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685 exp = VarExp(inParens); |
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686 if( exp != null ) |
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687 return parser.success(exp); |
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688 exp = Literal(inParens); |
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689 if( exp != null ) |
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690 return parser.success(exp); |
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691 return parser.failure(null); |
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692 } |
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693 |
104
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694 private Expr FunctionExpr(boolean inParens) throws ParseException { |
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695 if( !Keyword("function",inParens) ) |
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696 return null; |
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697 return RequiredFunction(inParens); |
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698 } |
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699 |
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700 private FnDef RequiredFunction(boolean inParens) throws ParseException { |
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701 int start = parser.begin(); |
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702 RequiredMatch('('); |
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703 Spaces(true); |
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704 frame = new Frame(frame); |
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705 List<String> names = NameList(false); |
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706 if( names != null ) { |
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707 addSymbols(names); |
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708 if( parser.match(',') ) { |
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709 Spaces(true); |
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710 if( !parser.match("...") ) |
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711 throw parser.exception(); |
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712 frame.isVarArg = true; |
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713 } |
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714 } else if( parser.match("...") ) { |
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715 Spaces(true); |
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716 frame.isVarArg = true; |
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717 } |
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718 RequiredMatch(')'); |
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719 Spaces(inParens); |
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720 Stmt block = RequiredBlock(); |
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721 RequiredKeyword("end",inParens); |
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722 FnDef fnDef = newFnDef(start,block); |
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723 frame = frame.parent; |
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724 return parser.success(fnDef); |
11
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725 } |
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726 |
104
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727 private VarArgs VarArgs(boolean inParens) throws ParseException { |
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728 int start = parser.begin(); |
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729 if( !frame.isVarArg || !parser.match("...") ) |
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730 return parser.failure(null); |
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731 Spaces(inParens); |
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732 return parser.success( new VarArgs(se(start)) ); |
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733 } |
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734 |
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735 private Expr TableExpr(boolean inParens) throws ParseException { |
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736 int start = parser.begin(); |
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737 if( !parser.match('{') ) |
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738 return parser.failure(null); |
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739 Spaces(true); |
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740 List<TableExpr.Field> fields = new ArrayList<TableExpr.Field>(); |
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741 ExpList.Builder builder = new ExpList.Builder(); |
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742 while( Field(fields,builder) && FieldSep() ); |
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743 RequiredMatch('}'); |
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744 return parser.success( new TableExpr( se(start), fields.toArray(new TableExpr.Field[0]), builder.build() ) ); |
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745 } |
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746 |
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747 private boolean FieldSep() throws ParseException { |
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748 if( !parser.anyOf(",;") ) |
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749 return false; |
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750 Spaces(true); |
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751 return true; |
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752 } |
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753 |
104
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754 private boolean Field(List<TableExpr.Field> fields,ExpList.Builder builder) throws ParseException { |
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755 parser.begin(); |
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756 Expr exp = SubExpr(true); |
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757 if( exp==null ) |
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758 exp = NameExpr(true); |
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759 if( exp!=null && parser.match('=') ) { |
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760 fields.add( new TableExpr.Field( exp, required(Expr(true)) ) ); |
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761 return parser.success(); |
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762 } |
104
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763 parser.rollback(); |
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764 exp = Expr(true); |
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765 if( exp != null ) { |
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766 builder.add(exp); |
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767 return parser.success(); |
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768 } |
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769 return parser.failure(); |
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770 } |
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771 |
104
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772 private Expr VarExp(boolean inParens) throws ParseException { |
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773 Var var = VarZ(inParens); |
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774 return var==null ? null : var.expr(); |
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775 } |
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776 |
104
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777 private Var VarZ(boolean inParens) throws ParseException { |
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778 int start = parser.begin(); |
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779 Var var = VarStart(inParens); |
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780 if( var==null ) |
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781 return parser.failure(null); |
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782 Var var2; |
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783 while( (var2=Var2(inParens,start,var.expr())) != null ) { |
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784 var = var2; |
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785 } |
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786 return parser.success(var); |
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787 } |
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788 |
104
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789 private Var Var2(boolean inParens,int start,Expr exp1) throws ParseException { |
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790 Var var = VarExt(inParens,start,exp1); |
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791 if( var != null ) |
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792 return var; |
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793 if( parser.match("->") ) { |
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794 Spaces(inParens); |
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795 ExpList.Builder builder = new ExpList.Builder(); |
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796 builder.add(exp1); |
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797 Expr exp2 = RequiredVarExpB(inParens); |
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798 FnCall fnCall = required(Args( inParens, start, exp2, builder )); |
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799 return exprVar( new ExpressionsExpr(fnCall) ); |
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800 } |
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801 FnCall fnCall = Args( inParens, start, exp1, new ExpList.Builder() ); |
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802 if( fnCall != null ) |
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803 return exprVar( new ExpressionsExpr(fnCall) ); |
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804 return null; |
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805 } |
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806 |
104
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807 private Expr RequiredVarExpB(boolean inParens) throws ParseException { |
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808 int start = parser.begin(); |
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809 Var var = required(VarStart(inParens)); |
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810 Var var2; |
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811 while( (var2=VarExt(inParens,start,var.expr())) != null ) { |
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812 var = var2; |
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813 } |
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814 return parser.success(var.expr()); |
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815 } |
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816 |
104
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817 private Var VarExt(boolean inParens,int start,Expr exp1) throws ParseException { |
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818 parser.begin(); |
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819 Expr exp2 = SubExpr(inParens); |
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820 exp2 = SubExpr(inParens); |
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821 if( exp2 != null ) |
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822 return parser.success(indexVar(start,exp1,exp2)); |
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823 if( parser.match('.') ) { |
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824 Spaces(inParens); |
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825 exp2 = NameExpr(inParens); |
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826 if( exp2!=null ) |
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827 return parser.success(indexVar(start,exp1,exp2)); |
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828 } |
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829 return parser.failure(null); |
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830 } |
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831 |
104
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832 private Var VarStart(boolean inParens) throws ParseException { |
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833 int start = parser.begin(); |
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834 if( parser.match('(') ) { |
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835 Spaces(true); |
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836 Expr exp = Expr(true); |
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837 RequiredMatch(')'); |
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838 Spaces(inParens); |
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839 return parser.success(exprVar(exp)); |
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840 } |
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841 String name = Name(inParens); |
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842 if( name != null ) |
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843 return parser.success(nameVar(start,name)); |
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844 return parser.failure(null); |
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845 } |
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846 |
104
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847 private Expr env() { |
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848 int index = stackIndex(_ENV); |
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849 if( index != -1 ) |
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850 return new GetLocalVar(null,index); |
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851 index = upValueIndex(_ENV); |
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852 if( index != -1 ) |
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853 return new GetUpVar(null,index); |
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854 throw new RuntimeException("_ENV not found"); |
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855 } |
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856 |
104
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857 private interface Var { |
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858 public Expr expr(); |
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859 public Settable settable(); |
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860 } |
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861 |
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862 private Var nameVar(final int start,final String name) { |
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863 return new Var() { |
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864 |
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865 public Expr expr() { |
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866 int index = stackIndex(name); |
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867 if( index != -1 ) |
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868 return new GetLocalVar(se(start),index); |
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869 index = upValueIndex(name); |
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870 if( index != -1 ) |
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871 return new GetUpVar(se(start),index); |
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872 return new IndexExpr( se(start), env(), new ConstExpr(name) ); |
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873 } |
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874 |
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875 public Settable settable() { |
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876 int index = stackIndex(name); |
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877 if( index != -1 ) |
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878 return new SetLocalVar(index); |
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879 index = upValueIndex(name); |
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880 if( index != -1 ) |
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881 return new SetUpVar(index); |
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882 return new SetTableEntry( se(start), env(), new ConstExpr(name) ); |
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883 } |
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884 }; |
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885 } |
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886 |
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887 private Var exprVar(final Expr expr) { |
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888 return new Var() { |
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889 |
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890 public Expr expr() { |
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891 return expr; |
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892 } |
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893 |
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894 public Settable settable() { |
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895 return null; |
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896 } |
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897 }; |
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898 } |
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899 |
104
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900 private Var indexVar(final int start,final Expr table,final Expr key) { |
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901 return new Var() { |
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902 |
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903 public Expr expr() { |
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904 return new IndexExpr( se(start), table, key ); |
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905 } |
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906 |
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907 public Settable settable() { |
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908 return new SetTableEntry(se(start),table,key); |
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909 } |
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910 }; |
9
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911 } |
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912 |
104
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913 private FnCall Args(boolean inParens,int start,Expr fn,ExpList.Builder builder) throws ParseException { |
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914 parser.begin(); |
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915 if( parser.match('(') ) { |
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916 Spaces(true); |
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917 ExpList(true,builder); // optional |
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918 RequiredMatch(')'); |
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919 Spaces(inParens); |
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920 } else { |
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921 Expr exp = TableExpr(inParens); |
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922 if( exp != null ) { |
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923 builder.add(exp); |
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924 } else { |
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925 String s = StringLiteral(inParens); |
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926 if( s != null ) { |
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927 builder.add( new ConstExpr(s) ); |
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928 } else { |
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929 return parser.failure(null); |
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930 } |
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931 } |
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932 } |
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933 return parser.success( new FnCall( se(start), fn, builder.build() ) ); |
11
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934 } |
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935 |
104
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936 private Expressions ExpList() throws ParseException { |
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937 return ExpList(false); |
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938 } |
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939 |
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940 private Expressions ExpList(boolean inParens) throws ParseException { |
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941 ExpList.Builder builder = new ExpList.Builder(); |
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942 return ExpList(inParens,builder) ? builder.build() : null; |
82
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943 } |
8ea2e94f3318
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944 |
104
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945 private boolean ExpList(boolean inParens,ExpList.Builder builder) throws ParseException { |
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946 parser.begin(); |
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947 Expr exp = Expr(inParens); |
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948 if( exp==null ) |
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949 return parser.failure(); |
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950 builder.add(exp); |
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951 while( parser.match(',') ) { |
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952 Spaces(inParens); |
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953 builder.add( RequiredExpr(inParens) ); |
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954 } |
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955 return parser.success(); |
9
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956 } |
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957 |
104
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958 private Expr SubExpr(boolean inParens) throws ParseException { |
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959 parser.begin(); |
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960 if( !parser.match('[') ) |
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961 return parser.failure(null); |
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962 Spaces(true); |
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963 Expr exp = RequiredExpr(true); |
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964 RequiredMatch(']'); |
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965 Spaces(inParens); |
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966 return parser.success(exp); |
11
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967 } |
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968 |
104
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969 private Expr NameExpr(boolean inParens) throws ParseException { |
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970 String name = Name(inParens); |
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971 return name==null ? null : new ConstExpr(name); |
54
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972 } |
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973 |
104
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974 private String RequiredName() throws ParseException { |
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975 parser.begin(); |
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976 String name = Name(); |
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977 if( name==null ) |
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978 parser.exception("Name expected"); |
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979 return parser.success(name); |
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980 } |
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981 |
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982 private String Name() throws ParseException { |
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983 return Name(false); |
11
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984 } |
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985 |
104
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986 private String Name(boolean inParens) throws ParseException { |
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987 int start = parser.begin(); |
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988 if( !NameFirstChar() ) |
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989 return parser.failure(null); |
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990 while( NameChar() ); |
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991 String match = parser.textFrom(start); |
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992 if( keywords.contains(match) ) |
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993 return parser.failure(null); |
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994 Spaces(inParens); |
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995 return parser.success(match); |
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996 } |
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997 |
104
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998 private boolean NameChar() { |
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999 return NameFirstChar() || Digit(); |
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1000 } |
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1001 |
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1002 private boolean NameFirstChar() { |
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1003 return parser.inCharRange('a', 'z') || parser.inCharRange('A', 'Z') || parser.match('_'); |
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1004 } |
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1005 |
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1006 private void RequiredMatch(char c) throws ParseException { |
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1007 if( !parser.match(c) ) |
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1008 throw parser.exception("'"+c+"' expected"); |
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1009 } |
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1010 |
104
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1011 private void RequiredMatch(String s) throws ParseException { |
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1012 if( !parser.match(s) ) |
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1013 throw parser.exception("'"+s+"' expected"); |
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1014 } |
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1015 |
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1016 private void RequiredKeyword(String keyword) throws ParseException { |
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1017 RequiredKeyword(keyword,false); |
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1018 } |
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1019 |
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1020 private boolean Keyword(String keyword) throws ParseException { |
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1021 return Keyword(keyword,false); |
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1022 } |
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1023 |
104
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1024 private void RequiredKeyword(String keyword,boolean inParens) throws ParseException { |
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1025 if( !Keyword(keyword,inParens) ) |
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1026 throw parser.exception("'"+keyword+"' expected"); |
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1027 } |
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1028 |
104
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1029 private boolean Keyword(String keyword,boolean inParens) throws ParseException { |
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1030 parser.begin(); |
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1031 if( !parser.match(keyword) || NameChar() ) |
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1032 return parser.failure(); |
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1033 Spaces(inParens); |
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1034 return parser.success(); |
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1035 } |
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1036 |
104
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1037 private static final Set<String> keywords = new HashSet<String>(Arrays.asList( |
12
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1038 "and", |
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1039 "break", |
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1040 "catch", |
12
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1041 "do", |
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1042 "else", |
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1043 "elseif", |
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1044 "end", |
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1045 "false", |
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1046 "for", |
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1047 "function", |
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1048 "goto", |
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1049 "if", |
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1050 "in", |
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1051 "local", |
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1052 "nil", |
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1053 "not", |
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1054 "or", |
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1055 "repeat", |
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1056 "return", |
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1057 "step", |
12
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1058 "then", |
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1059 "to", |
12
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1060 "true", |
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1061 "try", |
12
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1062 "until", |
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1063 "while" |
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1064 )); |
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1065 |
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1066 private Expr Literal(boolean inParens) throws ParseException { |
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1067 if( NilLiteral(inParens) ) |
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1068 return new ConstExpr(null); |
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1069 Boolean b = BooleanLiteral(inParens); |
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1070 if( b != null ) |
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1071 return new ConstExpr(b); |
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1072 Number n = NumberLiteral(inParens); |
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1073 if( n != null ) |
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1074 return new ConstExpr(n); |
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1075 String s = StringLiteral(inParens); |
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1076 if( s != null ) |
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1077 return new ConstExpr(s); |
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1078 return null; |
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1079 } |
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1080 |
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1081 private boolean NilLiteral(boolean inParens) throws ParseException { |
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1082 return Keyword("nil",inParens); |
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1083 } |
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1084 |
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1085 private Boolean BooleanLiteral(boolean inParens) throws ParseException { |
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1086 if( Keyword("true",inParens) ) |
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1087 return true; |
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1088 if( Keyword("false",inParens) ) |
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1089 return false; |
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1090 return null; |
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1091 } |
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1092 |
104
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1093 private Number NumberLiteral(boolean inParens) throws ParseException { |
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1094 parser.begin(); |
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1095 Number n; |
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1096 if( parser.matchIgnoreCase("0x") ) { |
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1097 n = HexNumber(); |
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1098 } else { |
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1099 n = DecNumber(); |
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1100 } |
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1101 if( n==null || NameChar() ) |
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1102 return parser.failure(null); |
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1103 Spaces(inParens); |
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1104 return parser.success(n); |
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1105 } |
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1106 |
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1107 private Number DecNumber() { |
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1108 int start = parser.begin(); |
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1109 if( Int() ) { |
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1110 if( parser.match('.') ) |
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1111 Int(); // optional |
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1112 } else if( parser.match('.') && Int() ) { |
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1113 // ok |
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1114 } else |
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1115 return parser.failure(null); |
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1116 Exponent(); // optional |
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1117 return parser.success(Double.valueOf(parser.textFrom(start))); |
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1118 } |
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1119 |
104
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1120 private boolean Exponent() { |
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1121 parser.begin(); |
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1122 if( !parser.matchIgnoreCase("e") ) |
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1123 return parser.failure(); |
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1124 parser.anyOf("+-"); // optional |
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1125 if( !Int() ) |
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1126 return parser.failure(); |
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1127 return parser.success(); |
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1128 } |
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1129 |
104
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1130 private boolean Int() { |
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1131 if( !Digit() ) |
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1132 return false; |
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1133 while( Digit() ); |
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1134 return true; |
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1135 } |
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1136 |
104
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1137 private boolean Digit() { |
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1138 return parser.inCharRange('0', '9'); |
16
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1139 } |
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1140 |
104
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1141 private Number HexNumber() { |
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1142 int start = parser.begin(); |
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1143 double n; |
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1144 if( HexInt() ) { |
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1145 n = (double)Long.parseLong(parser.textFrom(start),16); |
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1146 if( parser.match('.') ) { |
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1147 start = parser.currentIndex(); |
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1148 if( HexInt() ) { |
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1149 String dec = parser.textFrom(start); |
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1150 n += (double)Long.parseLong(dec,16) / Math.pow(16,dec.length()); |
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1151 } |
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1152 } |
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1153 } else if( parser.match('.') && HexInt() ) { |
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1154 String dec = parser.textFrom(start+1); |
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1155 n = (double)Long.parseLong(dec,16) / Math.pow(16,dec.length()); |
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1156 } else { |
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1157 return parser.failure(null); |
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1158 } |
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1159 if( parser.matchIgnoreCase("p") ) { |
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1160 parser.anyOf("+-"); // optional |
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1161 start = parser.currentIndex(); |
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1162 if( !HexInt() ) |
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1163 return parser.failure(null); |
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1164 n *= Math.pow(2,(double)Long.parseLong(parser.textFrom(start))); |
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1165 } |
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1166 return parser.success(Double.valueOf(n)); |
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1167 } |
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1168 |
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1169 private boolean HexInt() { |
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1170 if( !HexDigit() ) |
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1171 return false; |
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1172 while( HexDigit() ); |
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1173 return true; |
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1174 } |
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1175 |
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1176 |
104
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1177 private boolean HexDigit() { |
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1178 return Digit() || parser.anyOf("abcdefABCDEF"); |
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1179 } |
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1180 |
104
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1181 private String StringLiteral(boolean inParens) throws ParseException { |
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1182 String s; |
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1183 if( (s=QuotedString('"'))==null |
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1184 && (s=QuotedString('\''))==null |
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1185 && (s=LongString())==null |
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1186 ) |
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1187 return null; |
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1188 Spaces(inParens); |
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1189 return s; |
16
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1190 } |
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1191 |
104
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1192 private String LongString() throws ParseException { |
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1193 parser.begin(); |
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1194 if( !parser.match('[') ) |
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1195 return parser.failure(null); |
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1196 int start = parser.currentIndex(); |
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1197 while( parser.match('=') ); |
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1198 int nEquals = parser.currentIndex() - start; |
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1199 if( !parser.match('[') ) |
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1200 return parser.failure(null); |
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1201 start = parser.currentIndex(); |
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1202 while( !LongBracketsEnd(nEquals) ) { |
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1203 if( !parser.anyChar() ) |
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1204 throw parser.exception("Unclosed long string"); |
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1205 } |
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1206 String s = parser.text.substring( start, parser.currentIndex() - nEquals - 2 ); |
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1207 return parser.success(s); |
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1208 } |
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1209 |
104
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1210 private String QuotedString(char quote) throws ParseException { |
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1211 parser.begin(); |
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1212 if( !parser.match(quote) ) |
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1213 return parser.failure(null); |
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1214 StringBuilder buf = new StringBuilder(); |
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1215 while( !parser.match(quote) ) { |
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1216 Character c = EscSeq(); |
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1217 if( c != null ) { |
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1218 buf.append(c); |
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1219 } else { |
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1220 if( !parser.anyChar() ) |
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1221 throw parser.exception("Unclosed string"); |
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1222 buf.append(parser.lastChar()); |
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1223 } |
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1224 } |
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1225 return parser.success(buf.toString()); |
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1226 } |
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1227 |
104
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1228 private Character EscSeq() { |
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1229 parser.begin(); |
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1230 if( !parser.match('\\') ) |
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1231 return parser.failure(null); |
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1232 if( parser.match('a') ) return '\u0007'; |
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1233 if( parser.match('b') ) return '\b'; |
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1234 if( parser.match('f') ) return '\f'; |
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1235 if( parser.match('n') ) return '\n'; |
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1236 if( parser.match('r') ) return '\r'; |
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1237 if( parser.match('t') ) return '\t'; |
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1238 if( parser.match('v') ) return '\u000b'; |
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1239 if( parser.match('\\') ) return '\\'; |
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1240 if( parser.match('"') ) return '"'; |
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1241 if( parser.match('\'') ) return '\''; |
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1242 int start = parser.currentIndex(); |
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1243 if( parser.match('x') && HexDigit() && HexDigit() ) |
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1244 return (char)Integer.parseInt(parser.textFrom(start+1),16); |
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1245 if( Digit() ) { |
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1246 if( Digit() ) Digit(); // optional |
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1247 return (char)Integer.parseInt(parser.textFrom(start)); |
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1248 } |
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1249 return parser.failure(null); |
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1250 } |
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1251 |
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1252 private void Spaces() throws ParseException { |
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1253 Spaces(false); |
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1254 } |
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1255 |
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1256 private void Spaces(boolean inParens) throws ParseException { |
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1257 while( parser.anyOf(" \t") || Comment() || ContinueOnNextLine() || inParens && NewLine() ); |
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1258 } |
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1259 |
104
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1260 private boolean ContinueOnNextLine() { |
754e6030c029
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1261 parser.begin(); |
754e6030c029
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1262 return parser.match('\\') && EndOfLine() ? parser.success() : parser.failure(); |
7
bca8fc5d928b
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1263 } |
bca8fc5d928b
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1264 |
104
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1265 private boolean NewLine() { |
754e6030c029
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parents:
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1266 if( !EndOfLine() ) |
754e6030c029
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1267 return false; |
754e6030c029
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
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1268 if( parser.match("--") ) { |
754e6030c029
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
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1269 while( parser.noneOf("\r\n") ); |
754e6030c029
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1270 } |
18
3971113699b8
add NumericForStmt
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
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1271 return true; |
3971113699b8
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1272 } |
3971113699b8
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
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1273 |
104
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1274 private boolean Comment() throws ParseException { |
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
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1275 parser.begin(); |
754e6030c029
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parents:
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1276 if( !parser.match("--[") ) |
754e6030c029
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1277 return parser.failure(); |
754e6030c029
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1278 int start = parser.currentIndex(); |
754e6030c029
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1279 while( parser.match('=') ); |
754e6030c029
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1280 int nEquals = parser.currentIndex() - start; |
754e6030c029
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1281 if( !parser.match('[') ) |
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1282 return parser.failure(); |
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1283 while( !LongBracketsEnd(nEquals) ) { |
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1284 if( !parser.anyChar() ) |
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1285 throw parser.exception("Unclosed comment"); |
754e6030c029
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1286 } |
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1287 return parser.success(); |
754e6030c029
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1288 } |
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1289 |
754e6030c029
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parents:
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1290 private boolean LongBracketsEnd(int nEquals) { |
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1291 parser.begin(); |
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1292 if( !parser.match(']') ) |
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1293 return parser.failure(); |
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1294 while( nEquals-- > 0 ) { |
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1295 if( !parser.match('=') ) |
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1296 return parser.failure(); |
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1297 } |
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1298 if( !parser.match(']') ) |
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1299 return parser.failure(); |
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1300 return parser.success(); |
12
9cea1aea5eef
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1301 } |
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1302 |
5
9ef0fd711101
start LuaParser
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1303 } |