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annotate src/luan/interp/LuaParser.java @ 5:9ef0fd711101

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start LuaParser git-svn-id: https://luan-java.googlecode.com/svn/trunk@6 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Mon, 19 Nov 2012 09:49:06 +0000
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children a315783c9524
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1 package luan.interp;
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2
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3 import java.util.Scanner;
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4 import org.parboiled.BaseParser;
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5 import org.parboiled.Parboiled;
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6 import org.parboiled.Rule;
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7 import org.parboiled.parserunners.ReportingParseRunner;
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8 import org.parboiled.support.ParsingResult;
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9 import org.parboiled.errors.ErrorUtils;
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10 import luan.Lua;
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11 import luan.LuaState;
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14 public class LuaParser extends BaseParser<Object> {
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16 public Rule Target() {
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17 return Sequence(ConstExpr(), EOI);
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18 }
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19
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20 public Rule ConstExpr() {
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21 return Sequence(
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22 Const(),
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23 push(new ConstExpr(pop()))
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24 );
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25 }
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27 public Rule Const() {
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28 return FirstOf(
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29 NilConst(),
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30 BinaryConst(),
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31 NumberConst()
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32 );
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33 }
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34
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35 public Rule NilConst() {
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36 return Sequence(
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37 String("nil"),
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38 push(null)
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39 );
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40 }
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42 public Rule BinaryConst() {
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43 return FirstOf(
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44 TrueConst(),
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45 FalseConst()
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46 );
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47 }
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48
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49 public Rule TrueConst() {
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50 return Sequence(
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51 String("true"),
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52 push(true)
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53 );
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54 }
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56 public Rule FalseConst() {
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57 return Sequence(
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58 String("false"),
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59 push(false)
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60 );
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61 }
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62
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63 public Rule NumberConst() {
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64 return Sequence(
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65 Number(),
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66 push(Double.parseDouble(match()))
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67 );
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68 }
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69
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70 public Rule Number() {
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71 return FirstOf(
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72 Sequence(
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73 Int(),
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74 Optional(
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75 Ch('.'),
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76 Optional(Int())
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77 ),
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78 NumberExp()
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79 ),
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80 Sequence(
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81 Ch('.'),
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82 Int(),
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83 NumberExp()
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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 public Rule NumberExp() {
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89 return Optional(
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90 IgnoreCase('e'),
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91 Optional(AnyOf("+-")),
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92 Int()
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93 );
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94 }
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95
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96 Rule Int() {
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97 return OneOrMore(Digit());
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98 }
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99
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100 Rule Digit() {
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101 return CharRange('0', '9');
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102 }
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103
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104 // for testing
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105 public static void main(String[] args) throws Exception {
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106 LuaParser parser = Parboiled.createParser(LuaParser.class);
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107 while( true ) {
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108 String input = new Scanner(System.in).nextLine();
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109 ParsingResult<?> result = new ReportingParseRunner(parser.Target()).run(input);
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110 if( result.hasErrors() ) {
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111 System.out.println("Parse Errors:\n" + ErrorUtils.printParseErrors(result));
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112 } else {
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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113 Expr expr = (Expr)result.resultValue;
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114 LuaState lua = new LuaState();
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115 Object val = expr.eval(lua);
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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116 System.out.println("Result: "+Lua.toString(val));
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117 }
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118 }
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119 }
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120 }