Mercurial Hosting > luan
annotate src/luan/interp/LuaParser.java @ 9:600676034a1a
add variables and tables
git-svn-id: https://luan-java.googlecode.com/svn/trunk@10 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Wed, 21 Nov 2012 09:40:33 +0000 |
parents | 8896068e0a4b |
children | b7d7069fee58 |
rev | line source |
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5
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1 package luan.interp; |
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2 |
9
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3 import java.util.List; |
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4 import java.util.ArrayList; |
5
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5 import java.util.Scanner; |
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6 import org.parboiled.BaseParser; |
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7 import org.parboiled.Parboiled; |
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8 import org.parboiled.Rule; |
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9 import org.parboiled.parserunners.ReportingParseRunner; |
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10 import org.parboiled.support.ParsingResult; |
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11 import org.parboiled.errors.ErrorUtils; |
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12 import luan.Lua; |
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13 import luan.LuaNumber; |
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14 import luan.LuaState; |
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15 |
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16 |
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17 public class LuaParser extends BaseParser<Object> { |
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18 |
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19 Rule Target() { |
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20 return Sequence(Spaces(), Expr(), EOI); |
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21 } |
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22 |
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23 Rule Expr() { |
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24 return OrExpr(); |
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25 } |
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26 |
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27 Rule OrExpr() { |
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28 return Sequence( |
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29 AndExpr(), |
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30 ZeroOrMore( "or", Spaces(), AndExpr(), push( new OrExpr((Expr)pop(1),(Expr)pop()) ) ) |
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31 ); |
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32 } |
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33 |
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34 Rule AndExpr() { |
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35 return Sequence( |
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36 RelExpr(), |
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37 ZeroOrMore( "and", Spaces(), RelExpr(), push( new AndExpr((Expr)pop(1),(Expr)pop()) ) ) |
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38 ); |
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39 } |
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40 |
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41 Rule RelExpr() { |
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42 return Sequence( |
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43 ConcatExpr(), |
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44 ZeroOrMore( |
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45 FirstOf( |
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46 Sequence( "==", Spaces(), ConcatExpr(), push( new EqExpr((Expr)pop(1),(Expr)pop()) ) ), |
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47 Sequence( "~=", Spaces(), ConcatExpr(), push( new NotExpr(new EqExpr((Expr)pop(1),(Expr)pop())) ) ), |
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48 Sequence( "<=", Spaces(), ConcatExpr(), push( new LeExpr((Expr)pop(1),(Expr)pop()) ) ), |
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49 Sequence( ">=", Spaces(), ConcatExpr(), push( new LeExpr((Expr)pop(),(Expr)pop()) ) ), |
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50 Sequence( "<", Spaces(), ConcatExpr(), push( new LtExpr((Expr)pop(1),(Expr)pop()) ) ), |
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51 Sequence( ">", Spaces(), ConcatExpr(), push( new LtExpr((Expr)pop(),(Expr)pop()) ) ) |
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52 ) |
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53 ) |
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54 ); |
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55 } |
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56 |
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57 Rule ConcatExpr() { |
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58 return Sequence( |
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59 SumExpr(), |
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60 Optional( "..", Spaces(), ConcatExpr(), push( new ConcatExpr((Expr)pop(1),(Expr)pop()) ) ) |
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61 ); |
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62 } |
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63 |
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64 Rule SumExpr() { |
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65 return Sequence( |
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66 TermExpr(), |
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67 ZeroOrMore( |
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68 FirstOf( |
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69 Sequence( '+', Spaces(), TermExpr(), push( new AddExpr((Expr)pop(1),(Expr)pop()) ) ), |
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70 Sequence( '-', Spaces(), TermExpr(), push( new SubExpr((Expr)pop(1),(Expr)pop()) ) ) |
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71 ) |
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72 ) |
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73 ); |
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74 } |
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75 |
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76 Rule TermExpr() { |
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77 return Sequence( |
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78 UnaryExpr(), |
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79 ZeroOrMore( |
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80 FirstOf( |
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81 Sequence( '*', Spaces(), UnaryExpr(), push( new MulExpr((Expr)pop(1),(Expr)pop()) ) ), |
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82 Sequence( '/', Spaces(), UnaryExpr(), push( new DivExpr((Expr)pop(1),(Expr)pop()) ) ), |
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83 Sequence( '%', Spaces(), UnaryExpr(), push( new ModExpr((Expr)pop(1),(Expr)pop()) ) ) |
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84 ) |
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85 ) |
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86 ); |
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87 } |
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88 |
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89 Rule UnaryExpr() { |
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90 return FirstOf( |
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91 Sequence( '#', Spaces(), PowExpr(), push( new LenExpr((Expr)pop()) ) ), |
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92 Sequence( '-', Spaces(), PowExpr(), push( new UnmExpr((Expr)pop()) ) ), |
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93 Sequence( "not", Spaces(), PowExpr(), push( new NotExpr((Expr)pop()) ) ), |
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94 PowExpr() |
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95 ); |
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96 } |
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97 |
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98 Rule PowExpr() { |
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99 return Sequence( |
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100 SingleExpr(), |
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101 Optional( '^', Spaces(), PowExpr(), push( new PowExpr((Expr)pop(1),(Expr)pop()) ) ) |
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102 ); |
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103 } |
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104 |
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105 Rule SingleExpr() { |
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106 return FirstOf( |
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107 TableExpr(), |
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108 PrefixExpr(), |
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109 LiteralExpr() |
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110 ); |
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111 } |
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112 |
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113 Rule TableExpr() { |
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114 return Sequence( |
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115 '{', Spaces(), |
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116 push( new ArrayList<TableExpr.Field>() ), |
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117 push( 1.0 ), // counter |
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118 Optional( |
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119 Field(), |
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120 ZeroOrMore( |
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121 FieldSep(), |
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122 Field() |
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123 ), |
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124 Optional( FieldSep() ) |
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125 ), |
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126 '}', Spaces(), |
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127 push( newTableExpr() ) |
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128 ); |
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129 } |
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130 |
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131 TableExpr newTableExpr() { |
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132 pop(); // counter |
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133 @SuppressWarnings("unchecked") |
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134 List<TableExpr.Field> list = (List<TableExpr.Field>)pop(); |
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135 return new TableExpr(list.toArray(new TableExpr.Field[0])); |
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136 } |
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137 |
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138 Rule FieldSep() { |
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139 return Sequence( AnyOf(",;"), Spaces() ); |
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140 } |
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141 |
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142 Rule Field() { |
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143 return FirstOf( |
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144 Sequence( |
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145 FirstOf( SubExpr(), Name() ), |
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146 '=', Spaces(), Expr(), |
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147 addField() |
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148 ), |
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149 Sequence( |
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150 Expr(), |
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151 addIndexedField() |
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152 ) |
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153 ); |
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154 } |
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155 |
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156 boolean addField() { |
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157 TableExpr.Field field = new TableExpr.Field( (Expr)pop(1), (Expr)pop() ); |
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158 @SuppressWarnings("unchecked") |
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159 List<TableExpr.Field> list = (List<TableExpr.Field>)peek(1); |
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160 list.add(field); |
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161 return true; |
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162 } |
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163 |
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164 boolean addIndexedField() { |
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165 Expr val = (Expr)pop(); |
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166 double i = (Double)pop(); |
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167 TableExpr.Field field = new TableExpr.Field( new ConstExpr(new LuaNumber(i)), val ); |
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168 push( i + 1 ); |
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169 @SuppressWarnings("unchecked") |
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170 List<TableExpr.Field> list = (List<TableExpr.Field>)peek(1); |
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171 list.add(field); |
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172 return true; |
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173 } |
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174 |
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175 Rule PrefixExpr() { |
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176 return Sequence( |
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177 FirstOf( |
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178 Sequence( '(', Spaces(), Expr(), ')', Spaces() ), |
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179 Var() |
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180 ), |
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181 ZeroOrMore( |
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182 FirstOf( |
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183 SubExpr(), |
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184 Sequence( '.', Spaces(), Name() ) |
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185 ), |
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186 push( new GetExpr( (Expr)pop(1), (Expr)pop() ) ) |
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187 ) |
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188 ); |
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189 } |
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190 |
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191 Rule SubExpr() { |
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192 return Sequence( '[', Spaces(), Expr(), ']', Spaces() ); |
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193 } |
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194 |
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195 Rule Var() { |
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196 return Sequence( |
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197 Name(), |
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198 push( new GetExpr( EnvExpr.INSTANCE, (Expr)pop() ) ) |
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199 ); |
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200 } |
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201 |
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202 Rule Name() { |
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203 return Sequence( |
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204 Sequence( |
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205 NameStart(), |
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206 ZeroOrMore( |
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207 FirstOf( NameStart(), Digit() ) |
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208 ) |
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209 ), |
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210 push( new ConstExpr(match()) ), |
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211 Spaces() |
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212 ); |
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213 } |
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214 |
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215 Rule NameStart() { |
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216 return FirstOf( |
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217 CharRange('a', 'z'), |
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218 CharRange('A', 'Z'), |
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219 '_' |
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220 ); |
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221 } |
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222 |
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223 Rule LiteralExpr() { |
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224 return Sequence( |
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225 Literal(), Spaces(), |
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226 push(new ConstExpr(pop())) |
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227 ); |
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228 } |
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229 |
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230 Rule Literal() { |
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231 return FirstOf( |
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232 NilLiteral(), |
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233 BooleanLiteral(), |
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234 NumberLiteral(), |
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235 StringLiteral() |
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236 ); |
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237 } |
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238 |
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239 Rule NilLiteral() { |
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240 return Sequence( "nil", push(null) ); |
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241 } |
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242 |
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243 Rule BooleanLiteral() { |
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244 return FirstOf( |
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245 Sequence( "true", push(true) ), |
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246 Sequence( "false", push(false) ) |
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247 ); |
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248 } |
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249 |
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250 Rule NumberLiteral() { |
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251 return Sequence( |
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252 Number(), |
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253 push(new LuaNumber((Double)pop())) |
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254 ); |
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255 } |
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256 |
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257 Rule Number() { |
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258 return FirstOf( |
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259 Sequence( |
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260 IgnoreCase("0x"), |
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261 OneOrMore(HexDigit()), |
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262 push((double)Long.parseLong(match(),16)) |
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263 ), |
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264 Sequence( |
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265 DecNumber(), |
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266 push(Double.parseDouble(match())) |
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267 ) |
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268 ); |
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269 } |
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270 |
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271 Rule DecNumber() { |
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272 return FirstOf( |
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273 Sequence( |
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274 Int(), |
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275 Optional( '.', Optional(Int()) ), |
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276 NumberExp() |
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277 ), |
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278 Sequence( '.', Int(), NumberExp() ) |
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279 ); |
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280 } |
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281 |
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282 Rule NumberExp() { |
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283 return Optional( |
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284 IgnoreCase('e'), |
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285 Optional(AnyOf("+-")), |
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286 Int() |
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287 ); |
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288 } |
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289 |
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290 Rule Int() { |
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291 return OneOrMore(Digit()); |
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292 } |
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293 |
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294 Rule HexDigit() { |
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295 return FirstOf( |
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296 Digit(), |
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297 AnyOf("abcdefABCDEF") |
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298 ); |
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299 } |
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300 |
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301 Rule Digit() { |
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302 return CharRange('0', '9'); |
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303 } |
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304 |
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305 Rule StringLiteral() { |
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306 return FirstOf( |
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307 QuotedString('"'), |
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308 QuotedString('\'') |
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309 ); |
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310 } |
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311 |
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312 Rule QuotedString(char quote) { |
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313 return Sequence( |
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314 quote, |
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315 push(new StringBuffer()), |
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316 ZeroOrMore( |
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317 FirstOf( |
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318 Sequence( |
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319 NoneOf("\\\n"+quote), |
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320 append(matchedChar()) |
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321 ), |
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322 EscSeq() |
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323 ) |
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324 ), |
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325 quote, |
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326 push(((StringBuffer)pop()).toString()) |
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327 ); |
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328 } |
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329 |
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330 Rule EscSeq() { |
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331 return Sequence( |
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332 '\\', |
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333 FirstOf( |
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334 Sequence( 'a', append('\u0007') ), |
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335 Sequence( 'b', append('\b') ), |
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336 Sequence( 'f', append('\f') ), |
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337 Sequence( 'n', append('\n') ), |
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338 Sequence( 'r', append('\r') ), |
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339 Sequence( 't', append('\t') ), |
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340 Sequence( 'v', append('\u000b') ), |
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341 Sequence( '\\', append('\\') ), |
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342 Sequence( '"', append('"') ), |
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343 Sequence( '\'', append('\'') ), |
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344 Sequence( |
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345 'x', |
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346 Sequence( HexDigit(), HexDigit() ), |
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347 append( (char)Integer.parseInt(match(),16) ) |
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348 ), |
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349 Sequence( |
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350 Sequence( |
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351 Digit(), |
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352 Optional( |
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353 Digit(), |
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354 Optional( |
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355 Digit() |
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356 ) |
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357 ) |
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358 ), |
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359 append( (char)Integer.parseInt(match()) ) |
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360 ) |
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361 ) |
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362 ); |
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363 } |
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364 |
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365 boolean append(char ch) { |
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366 StringBuffer sb = (StringBuffer)peek(); |
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367 sb.append(ch); |
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368 return true; |
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369 } |
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370 |
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371 public Rule Spaces() { |
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372 return ZeroOrMore(AnyOf(" \t")); |
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373 } |
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374 |
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375 // for testing |
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376 public static void main(String[] args) throws Exception { |
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377 LuaParser parser = Parboiled.createParser(LuaParser.class); |
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378 while( true ) { |
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379 String input = new Scanner(System.in).nextLine(); |
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380 ParsingResult<?> result = new ReportingParseRunner(parser.Target()).run(input); |
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381 if( result.hasErrors() ) { |
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382 System.out.println("Parse Errors:\n" + ErrorUtils.printParseErrors(result)); |
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383 } else { |
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384 Expr expr = (Expr)result.resultValue; |
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385 LuaState lua = new LuaState(); |
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386 Object val = expr.eval(lua); |
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387 System.out.println("Result: "+Lua.toString(val)); |
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388 } |
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389 } |
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390 } |
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391 } |