svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.library / org.gvsig.expressionevaluator / org.gvsig.expressionevaluator.lib / org.gvsig.expressionevaluator.lib.impl / src / main / java / org / gvsig / expressionevaluator / impl / DefaultCompiler.java @ 43519
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1 | 43512 | jjdelcerro | package org.gvsig.expressionevaluator.impl; |
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2 | |||
3 | import org.gvsig.expressionevaluator.Compiler; |
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4 | import org.gvsig.expressionevaluator.Code.Caller.Arguments; |
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5 | import org.gvsig.expressionevaluator.LexicalAnalyzer; |
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6 | import org.gvsig.expressionevaluator.LexicalAnalyzer.Token; |
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7 | import org.gvsig.expressionevaluator.Code; |
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8 | import org.gvsig.expressionevaluator.CodeBuilder; |
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9 | |||
10 | public class DefaultCompiler implements Compiler { |
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11 | |||
12 | private LexicalAnalyzer lexer;
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13 | private CodeBuilder codeBuilder;
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14 | |||
15 | public DefaultCompiler() {
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16 | this.lexer = new SQLLexicalAnalyzer(); |
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17 | this.codeBuilder = new DefaultCodeBuilder(); |
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18 | } |
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19 | |||
20 | @Override
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21 | public void setLexicalAnalyzer(LexicalAnalyzer lexer) { |
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22 | this.lexer = lexer;
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23 | } |
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24 | |||
25 | @Override
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26 | public void setCodeBuilder(CodeBuilder codeBuilder) { |
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27 | this.codeBuilder = codeBuilder;
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28 | } |
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29 | |||
30 | @Override
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31 | public Code compileExpression(String expression) { |
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32 | this.lexer.setSource(expression);
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33 | return parseExpression();
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34 | } |
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35 | |||
36 | private Code parseExpression() {
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37 | return parse_relational();
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38 | } |
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39 | |||
40 | private Code parse_relational() {
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41 | Code op1 = parse_not(); |
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42 | Code op2; |
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43 | while( true ) { |
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44 | Token token = lexer.look(); |
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45 | switch( token.getType() ) {
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46 | case Token.OP_OR:
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47 | lexer.next(); |
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48 | op2 = parse_not(); |
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49 | op1 = codeBuilder.or(op1, op2); |
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50 | break;
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51 | case Token.OP_AND:
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52 | lexer.next(); |
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53 | op2 = parse_not(); |
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54 | op1 = codeBuilder.and(op1, op2); |
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55 | break;
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56 | default:
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57 | return op1;
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58 | } |
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59 | } |
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60 | } |
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61 | |||
62 | private Code parse_not() {
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63 | Code op1; |
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64 | Token token = lexer.look(); |
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65 | if( token.getType() == Token.OP_NOT ) {
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66 | lexer.next(); |
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67 | op1 = parse_conditional(); |
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68 | op1 = codeBuilder.not(op1); |
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69 | } else {
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70 | op1 = parse_conditional(); |
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71 | } |
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72 | return op1;
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73 | } |
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74 | |||
75 | private Code parse_conditional() {
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76 | Code op1 = parse_sum(); |
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77 | Code op2; |
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78 | while( true ) { |
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79 | Token token = lexer.look(); |
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80 | switch( token.getType() ) {
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81 | case Token.OP_LT:
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82 | lexer.next(); |
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83 | op2 = parse_sum(); |
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84 | op1 = codeBuilder.lt(op1, op2); |
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85 | break;
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86 | case Token.OP_GT:
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87 | lexer.next(); |
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88 | op2 = parse_sum(); |
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89 | op1 = codeBuilder.gt(op1, op2); |
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90 | break;
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91 | case Token.OP_LE:
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92 | lexer.next(); |
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93 | op2 = parse_sum(); |
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94 | op1 = codeBuilder.le(op1, op2); |
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95 | break;
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96 | case Token.OP_GE:
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97 | lexer.next(); |
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98 | op2 = parse_sum(); |
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99 | op1 = codeBuilder.ge(op1, op2); |
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100 | break;
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101 | case Token.OP_EQ:
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102 | lexer.next(); |
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103 | op2 = parse_sum(); |
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104 | op1 = codeBuilder.eq(op1, op2); |
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105 | break;
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106 | case Token.PRED_IS: {
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107 | lexer.next(); |
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108 | Token next = lexer.look(); |
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109 | if( next.getType() == Token.NOTNULL ) {
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110 | op1 = codeBuilder.is(op1, codeBuilder.constant(null));
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111 | op1 = codeBuilder.not(op1); |
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112 | } else {
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113 | op2 = parse_sum(); |
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114 | op1 = codeBuilder.is(op1, op2); |
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115 | } |
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116 | } |
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117 | break;
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118 | case Token.ISNULL:
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119 | lexer.next(); |
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120 | op1 = codeBuilder.is(op1, codeBuilder.constant(null));
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121 | break;
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122 | case Token.OP_NE:
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123 | lexer.next(); |
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124 | op2 = parse_sum(); |
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125 | op1 = codeBuilder.ne(op1, op2); |
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126 | break;
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127 | case Token.PRED_LIKE:
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128 | lexer.next(); |
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129 | op2 = parse_sum(); |
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130 | op1 = codeBuilder.like(op1, op2); |
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131 | break;
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132 | case Token.PRED_ILIKE:
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133 | lexer.next(); |
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134 | op2 = parse_sum(); |
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135 | op1 = codeBuilder.ilike(op1, op2); |
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136 | break;
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137 | default:
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138 | return op1;
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139 | } |
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140 | } |
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141 | } |
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142 | |||
143 | private Code parse_sum() {
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144 | Code op1 = parse_factor(); |
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145 | Code op2; |
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146 | while( true ) { |
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147 | Token token = lexer.look(); |
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148 | switch( token.getType() ) {
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149 | case Token.OP_ADD:
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150 | lexer.next(); |
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151 | op2 = parse_factor(); |
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152 | op1 = codeBuilder.add(op1, op2); |
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153 | break;
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154 | case Token.OP_SUBST:
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155 | lexer.next(); |
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156 | op2 = parse_factor(); |
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157 | op1 = codeBuilder.subst(op1, op2); |
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158 | break;
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159 | default:
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160 | return op1;
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161 | } |
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162 | } |
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163 | } |
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164 | |||
165 | private Code parse_factor() {
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166 | Code op1 = parse_termino(); |
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167 | Code op2; |
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168 | while( true ) { |
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169 | Token token = lexer.look(); |
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170 | switch( token.getType() ) {
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171 | case Token.OP_MULT:
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172 | lexer.next(); |
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173 | op2 = parse_termino(); |
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174 | op1 = codeBuilder.mult(op1, op2); |
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175 | break;
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176 | case Token.OP_DIV:
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177 | lexer.next(); |
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178 | op2 = parse_termino(); |
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179 | op1 = codeBuilder.div(op1, op2); |
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180 | break;
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181 | case Token.OP_MOD:
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182 | lexer.next(); |
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183 | op2 = parse_termino(); |
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184 | op1 = codeBuilder.mod(op1, op2); |
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185 | break;
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186 | default:
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187 | return op1;
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188 | } |
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189 | } |
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190 | } |
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191 | |||
192 | private Code parse_termino() {
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193 | |||
194 | Token token = lexer.look(); |
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195 | switch( token.getType() ) {
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196 | case Token.PARENTHESIS_OPEN: {
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197 | lexer.next(); |
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198 | Code value = parseExpression(); |
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199 | Token next = lexer.next(); |
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200 | if( next.getType() != Token.PARENTHESIS_CLOSE ) {
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201 | throw new RuntimeException(); |
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202 | } |
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203 | return value;
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204 | } |
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205 | case Token.IDENTIFIER: {
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206 | lexer.next(); |
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207 | String id = (String) token.getLiteral(); |
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208 | Token next = lexer.look(); |
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209 | if( next.getType() == Token.PARENTHESIS_OPEN ) {
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210 | lexer.next(); |
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211 | Arguments args = parseArgs(); |
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212 | next = lexer.next(); |
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213 | if( next.getType() != Token.PARENTHESIS_CLOSE ) {
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214 | throw new RuntimeException("Expected ')'."); |
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215 | } |
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216 | return codeBuilder.function(id, args);
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217 | } else {
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218 | return codeBuilder.identifier(id);
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219 | } |
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220 | } |
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221 | case Token.STRING_LITERAL:
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222 | lexer.next(); |
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223 | return codeBuilder.constant(token.getValue());
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224 | case Token.INTEGER_LITERAL:
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225 | lexer.next(); |
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226 | return codeBuilder.constant(token.getValue());
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227 | case Token.FLOATING_POINT_LITERAL:
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228 | lexer.next(); |
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229 | return codeBuilder.constant(token.getValue());
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230 | case Token.NULL:
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231 | lexer.next(); |
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232 | return codeBuilder.constant(null); |
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233 | case Token.TRUE:
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234 | lexer.next(); |
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235 | return codeBuilder.constant(true); |
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236 | case Token.FALSE:
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237 | lexer.next(); |
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238 | return codeBuilder.constant(false); |
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239 | } |
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240 | return null; |
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241 | } |
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242 | |||
243 | private Arguments parseArgs() {
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244 | Arguments args = null;
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245 | while( true ) { |
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246 | Code arg = parseExpression(); |
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247 | 43519 | jjdelcerro | if( arg!=null ) { |
248 | if( args == null ) { |
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249 | args = codeBuilder.args(); |
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250 | } |
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251 | args.add(arg); |
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252 | } |
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253 | 43512 | jjdelcerro | Token next = lexer.look(); |
254 | switch( next.getType() ) {
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255 | case Token.COMA:
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256 | lexer.next(); // Consume el ",".
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257 | break;
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258 | default:
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259 | return args;
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260 | } |
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261 | } |
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262 | } |
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263 | } |