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 @ 44053
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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 | 43983 | jjdelcerro | import org.gvsig.expressionevaluator.ExpressionSyntaxException; |
| 10 | 43512 | jjdelcerro | |
| 11 | public class DefaultCompiler implements Compiler { |
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| 12 | |||
| 13 | 43939 | jjdelcerro | private boolean objectAccessSupported; |
| 14 | 43512 | jjdelcerro | private LexicalAnalyzer lexer;
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| 15 | private CodeBuilder codeBuilder;
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| 16 | 43532 | jjdelcerro | //
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| 17 | // https://www.postgresql.org/docs/9.1/static/functions.html
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| 18 | //
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| 19 | 43512 | jjdelcerro | |
| 20 | public DefaultCompiler() {
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| 21 | this.lexer = new SQLLexicalAnalyzer(); |
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| 22 | this.codeBuilder = new DefaultCodeBuilder(); |
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| 23 | 43939 | jjdelcerro | this.objectAccessSupported = true; |
| 24 | 43512 | jjdelcerro | } |
| 25 | |||
| 26 | @Override
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| 27 | 43809 | jjdelcerro | public Compiler clone() throws CloneNotSupportedException { |
| 28 | DefaultCompiler other = (DefaultCompiler) super.clone();
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| 29 | other.lexer = lexer.clone(); |
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| 30 | other.codeBuilder = codeBuilder.clone(); |
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| 31 | |||
| 32 | return other;
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| 33 | } |
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| 34 | |||
| 35 | @Override
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| 36 | 43512 | jjdelcerro | public void setLexicalAnalyzer(LexicalAnalyzer lexer) { |
| 37 | this.lexer = lexer;
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| 38 | } |
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| 39 | 43983 | jjdelcerro | |
| 40 | @Override
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| 41 | public LexicalAnalyzer getLexicalAnalyzer() {
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| 42 | return this.lexer; |
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| 43 | } |
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| 44 | 43512 | jjdelcerro | |
| 45 | @Override
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| 46 | public void setCodeBuilder(CodeBuilder codeBuilder) { |
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| 47 | this.codeBuilder = codeBuilder;
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| 48 | } |
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| 49 | 43809 | jjdelcerro | |
| 50 | 43512 | jjdelcerro | @Override
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| 51 | 43809 | jjdelcerro | public CodeBuilder getCodeBuilder() {
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| 52 | return this.codeBuilder; |
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| 53 | } |
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| 54 | |||
| 55 | @Override
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| 56 | 43939 | jjdelcerro | public boolean isObjectAccessSupported() { |
| 57 | return this.objectAccessSupported; |
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| 58 | } |
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| 59 | |||
| 60 | @Override
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| 61 | public void setObjectAccessSupported(boolean objectAccessSupported) { |
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| 62 | this.objectAccessSupported = objectAccessSupported;
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| 63 | } |
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| 64 | |||
| 65 | @Override
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| 66 | 43512 | jjdelcerro | public Code compileExpression(String expression) { |
| 67 | 43983 | jjdelcerro | this.lexer.setSource(expression.trim());
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| 68 | Code code = parseExpression(); |
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| 69 | if( !this.lexer.isEOF() ) { |
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| 70 | throw new ExpressionSyntaxException(lexer); |
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| 71 | } |
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| 72 | return code;
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| 73 | 43512 | jjdelcerro | } |
| 74 | |||
| 75 | private Code parseExpression() {
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| 76 | 43983 | jjdelcerro | Code code = parse_relational(); |
| 77 | return code;
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| 78 | 43512 | jjdelcerro | } |
| 79 | |||
| 80 | private Code parse_relational() {
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| 81 | Code op1 = parse_not(); |
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| 82 | Code op2; |
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| 83 | while( true ) { |
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| 84 | Token token = lexer.look(); |
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| 85 | switch( token.getType() ) {
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| 86 | case Token.OP_OR:
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| 87 | lexer.next(); |
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| 88 | op2 = parse_not(); |
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| 89 | 43983 | jjdelcerro | if( op2==null ) { |
| 90 | throw new ExpressionSyntaxException(lexer); |
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| 91 | } |
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| 92 | 43512 | jjdelcerro | op1 = codeBuilder.or(op1, op2); |
| 93 | break;
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| 94 | case Token.OP_AND:
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| 95 | lexer.next(); |
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| 96 | op2 = parse_not(); |
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| 97 | 43983 | jjdelcerro | if( op2==null ) { |
| 98 | throw new ExpressionSyntaxException(lexer); |
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| 99 | } |
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| 100 | 43512 | jjdelcerro | op1 = codeBuilder.and(op1, op2); |
| 101 | break;
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| 102 | default:
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| 103 | return op1;
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| 104 | } |
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| 105 | } |
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| 106 | } |
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| 107 | |||
| 108 | private Code parse_not() {
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| 109 | Code op1; |
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| 110 | Token token = lexer.look(); |
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| 111 | if( token.getType() == Token.OP_NOT ) {
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| 112 | lexer.next(); |
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| 113 | op1 = parse_conditional(); |
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| 114 | op1 = codeBuilder.not(op1); |
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| 115 | } else {
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| 116 | op1 = parse_conditional(); |
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| 117 | } |
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| 118 | return op1;
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| 119 | } |
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| 120 | |||
| 121 | private Code parse_conditional() {
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| 122 | Code op1 = parse_sum(); |
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| 123 | Code op2; |
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| 124 | while( true ) { |
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| 125 | Token token = lexer.look(); |
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| 126 | switch( token.getType() ) {
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| 127 | case Token.OP_LT:
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| 128 | lexer.next(); |
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| 129 | op2 = parse_sum(); |
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| 130 | 43983 | jjdelcerro | if( op2==null ) { |
| 131 | throw new ExpressionSyntaxException(lexer); |
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| 132 | } |
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| 133 | 43512 | jjdelcerro | op1 = codeBuilder.lt(op1, op2); |
| 134 | break;
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| 135 | case Token.OP_GT:
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| 136 | lexer.next(); |
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| 137 | op2 = parse_sum(); |
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| 138 | 43983 | jjdelcerro | if( op2==null ) { |
| 139 | throw new ExpressionSyntaxException(lexer); |
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| 140 | } |
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| 141 | 43512 | jjdelcerro | op1 = codeBuilder.gt(op1, op2); |
| 142 | break;
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| 143 | case Token.OP_LE:
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| 144 | lexer.next(); |
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| 145 | op2 = parse_sum(); |
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| 146 | 43983 | jjdelcerro | if( op2==null ) { |
| 147 | throw new ExpressionSyntaxException(lexer); |
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| 148 | } |
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| 149 | 43512 | jjdelcerro | op1 = codeBuilder.le(op1, op2); |
| 150 | break;
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| 151 | case Token.OP_GE:
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| 152 | lexer.next(); |
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| 153 | op2 = parse_sum(); |
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| 154 | 43983 | jjdelcerro | if( op2==null ) { |
| 155 | throw new ExpressionSyntaxException(lexer); |
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| 156 | } |
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| 157 | 43512 | jjdelcerro | op1 = codeBuilder.ge(op1, op2); |
| 158 | break;
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| 159 | case Token.OP_EQ:
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| 160 | lexer.next(); |
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| 161 | op2 = parse_sum(); |
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| 162 | 43983 | jjdelcerro | if( op2==null ) { |
| 163 | throw new ExpressionSyntaxException(lexer); |
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| 164 | } |
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| 165 | 43512 | jjdelcerro | op1 = codeBuilder.eq(op1, op2); |
| 166 | break;
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| 167 | 43521 | jjdelcerro | case Token.OP_NE:
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| 168 | 43512 | jjdelcerro | lexer.next(); |
| 169 | 43521 | jjdelcerro | op2 = parse_sum(); |
| 170 | 43983 | jjdelcerro | if( op2==null ) { |
| 171 | throw new ExpressionSyntaxException(lexer); |
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| 172 | } |
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| 173 | 43521 | jjdelcerro | op1 = codeBuilder.ne(op1, op2); |
| 174 | break;
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| 175 | case Token.PRED_IS: {
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| 176 | lexer.next(); |
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| 177 | Token next = lexer.look(); |
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| 178 | if( next.getType() == Token.NOTNULL ) {
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| 179 | op1 = codeBuilder.is(op1, codeBuilder.constant(null));
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| 180 | op1 = codeBuilder.not(op1); |
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| 181 | } else {
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| 182 | op2 = parse_sum(); |
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| 183 | 43983 | jjdelcerro | if( op2==null ) { |
| 184 | throw new ExpressionSyntaxException(lexer); |
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| 185 | } |
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| 186 | 43521 | jjdelcerro | op1 = codeBuilder.is(op1, op2); |
| 187 | } |
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| 188 | 43512 | jjdelcerro | } |
| 189 | 43521 | jjdelcerro | break;
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| 190 | 43512 | jjdelcerro | case Token.ISNULL:
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| 191 | lexer.next(); |
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| 192 | op1 = codeBuilder.is(op1, codeBuilder.constant(null));
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| 193 | break;
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| 194 | 43532 | jjdelcerro | case Token.OP_REGEXP:
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| 195 | lexer.next(); |
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| 196 | op2 = parse_sum(); |
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| 197 | 43983 | jjdelcerro | if( op2==null ) { |
| 198 | throw new ExpressionSyntaxException(lexer); |
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| 199 | } |
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| 200 | 43532 | jjdelcerro | op1 = codeBuilder.regexp(op1, op2); |
| 201 | break;
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| 202 | 43512 | jjdelcerro | case Token.PRED_LIKE:
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| 203 | lexer.next(); |
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| 204 | op2 = parse_sum(); |
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| 205 | 43983 | jjdelcerro | if( op2==null ) { |
| 206 | throw new ExpressionSyntaxException(lexer); |
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| 207 | } |
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| 208 | 43512 | jjdelcerro | op1 = codeBuilder.like(op1, op2); |
| 209 | break;
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| 210 | case Token.PRED_ILIKE:
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| 211 | lexer.next(); |
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| 212 | op2 = parse_sum(); |
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| 213 | 43983 | jjdelcerro | if( op2==null ) { |
| 214 | throw new ExpressionSyntaxException(lexer); |
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| 215 | } |
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| 216 | 43512 | jjdelcerro | op1 = codeBuilder.ilike(op1, op2); |
| 217 | break;
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| 218 | default:
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| 219 | return op1;
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| 220 | } |
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| 221 | } |
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| 222 | } |
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| 223 | |||
| 224 | private Code parse_sum() {
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| 225 | Code op1 = parse_factor(); |
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| 226 | Code op2; |
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| 227 | while( true ) { |
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| 228 | Token token = lexer.look(); |
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| 229 | switch( token.getType() ) {
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| 230 | case Token.OP_ADD:
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| 231 | lexer.next(); |
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| 232 | op2 = parse_factor(); |
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| 233 | op1 = codeBuilder.add(op1, op2); |
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| 234 | break;
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| 235 | case Token.OP_SUBST:
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| 236 | lexer.next(); |
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| 237 | op2 = parse_factor(); |
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| 238 | op1 = codeBuilder.subst(op1, op2); |
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| 239 | break;
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| 240 | default:
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| 241 | return op1;
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| 242 | } |
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| 243 | } |
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| 244 | } |
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| 245 | |||
| 246 | private Code parse_factor() {
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| 247 | 43939 | jjdelcerro | Code op1 = parse_getattr(); |
| 248 | 43512 | jjdelcerro | Code op2; |
| 249 | while( true ) { |
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| 250 | Token token = lexer.look(); |
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| 251 | switch( token.getType() ) {
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| 252 | case Token.OP_MULT:
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| 253 | lexer.next(); |
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| 254 | 43939 | jjdelcerro | op2 = parse_getattr(); |
| 255 | 43983 | jjdelcerro | if( op2==null ) { |
| 256 | throw new ExpressionSyntaxException(lexer); |
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| 257 | } |
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| 258 | 43512 | jjdelcerro | op1 = codeBuilder.mult(op1, op2); |
| 259 | break;
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| 260 | case Token.OP_DIV:
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| 261 | lexer.next(); |
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| 262 | 43939 | jjdelcerro | op2 = parse_getattr(); |
| 263 | 43983 | jjdelcerro | if( op2==null ) { |
| 264 | throw new ExpressionSyntaxException(lexer); |
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| 265 | } |
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| 266 | 43512 | jjdelcerro | op1 = codeBuilder.div(op1, op2); |
| 267 | break;
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| 268 | case Token.OP_MOD:
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| 269 | lexer.next(); |
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| 270 | 43939 | jjdelcerro | op2 = parse_getattr(); |
| 271 | 43983 | jjdelcerro | if( op2==null ) { |
| 272 | throw new ExpressionSyntaxException(lexer); |
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| 273 | } |
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| 274 | 43512 | jjdelcerro | op1 = codeBuilder.mod(op1, op2); |
| 275 | break;
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| 276 | default:
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| 277 | return op1;
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| 278 | } |
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| 279 | } |
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| 280 | } |
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| 281 | |||
| 282 | 43939 | jjdelcerro | private Code parse_getattr() {
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| 283 | Code op1 = parse_termino(); |
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| 284 | if( !isObjectAccessSupported() ) {
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| 285 | return op1;
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| 286 | } |
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| 287 | while( true ) { |
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| 288 | Token next = lexer.look(); |
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| 289 | switch( next.getType() ) {
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| 290 | case Token.OP_GETATTR:
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| 291 | lexer.next(); |
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| 292 | next = lexer.look(); |
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| 293 | if( next.getType()!=Token.IDENTIFIER ) {
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| 294 | 43983 | jjdelcerro | throw new ExpressionSyntaxException( |
| 295 | "An attribute identifier was expected and '"+next.getLiteral()+"' was found", |
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| 296 | lexer.getSource(), |
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| 297 | lexer.getPosition() |
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| 298 | ); |
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| 299 | 43939 | jjdelcerro | } |
| 300 | String id = (String) next.getLiteral(); |
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| 301 | lexer.next(); |
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| 302 | next = lexer.look(); |
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| 303 | if( next.getType() == Token.PARENTHESIS_OPEN ) {
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| 304 | lexer.next(); |
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| 305 | Arguments args = parseArgs(); |
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| 306 | next = lexer.next(); |
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| 307 | if( next.getType() != Token.PARENTHESIS_CLOSE ) {
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| 308 | 43983 | jjdelcerro | throw new ExpressionSyntaxException( |
| 309 | "Closing parenthesis was expected and '"+next.getLiteral()+"' was found", |
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| 310 | lexer.getSource(), |
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| 311 | lexer.getPosition() |
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| 312 | ); |
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| 313 | 43939 | jjdelcerro | } |
| 314 | return codeBuilder.method(op1, id, args);
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| 315 | } else {
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| 316 | return codeBuilder.getattr(op1, id);
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| 317 | } |
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| 318 | default:
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| 319 | return op1;
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| 320 | } |
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| 321 | } |
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| 322 | } |
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| 323 | |||
| 324 | 43512 | jjdelcerro | private Code parse_termino() {
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| 325 | |||
| 326 | Token token = lexer.look(); |
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| 327 | switch( token.getType() ) {
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| 328 | case Token.PARENTHESIS_OPEN: {
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| 329 | 43521 | jjdelcerro | lexer.next(); |
| 330 | Code value = parseExpression(); |
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| 331 | Token next = lexer.next(); |
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| 332 | if( next.getType() != Token.PARENTHESIS_CLOSE ) {
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| 333 | 43983 | jjdelcerro | throw new ExpressionSyntaxException( |
| 334 | "Closing parenthesis was expected and '"+next.getLiteral()+"' was found", |
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| 335 | lexer.getSource(), |
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| 336 | lexer.getPosition() |
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| 337 | ); |
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| 338 | 43521 | jjdelcerro | } |
| 339 | return value;
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| 340 | 43512 | jjdelcerro | } |
| 341 | case Token.IDENTIFIER: {
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| 342 | lexer.next(); |
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| 343 | 43521 | jjdelcerro | String id = (String) token.getLiteral(); |
| 344 | Token next = lexer.look(); |
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| 345 | if( next.getType() == Token.PARENTHESIS_OPEN ) {
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| 346 | lexer.next(); |
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| 347 | Arguments args = parseArgs(); |
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| 348 | next = lexer.next(); |
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| 349 | if( next.getType() != Token.PARENTHESIS_CLOSE ) {
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| 350 | 43983 | jjdelcerro | throw new ExpressionSyntaxException( |
| 351 | "Closing parenthesis was expected and '"+next.getLiteral()+"' was found", |
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| 352 | lexer.getSource(), |
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| 353 | lexer.getPosition() |
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| 354 | ); |
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| 355 | 43521 | jjdelcerro | } |
| 356 | return codeBuilder.function(id, args);
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| 357 | } else {
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| 358 | return codeBuilder.identifier(id);
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| 359 | 43512 | jjdelcerro | } |
| 360 | } |
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| 361 | case Token.STRING_LITERAL:
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| 362 | lexer.next(); |
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| 363 | return codeBuilder.constant(token.getValue());
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| 364 | case Token.INTEGER_LITERAL:
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| 365 | lexer.next(); |
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| 366 | return codeBuilder.constant(token.getValue());
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| 367 | case Token.FLOATING_POINT_LITERAL:
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| 368 | lexer.next(); |
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| 369 | return codeBuilder.constant(token.getValue());
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| 370 | case Token.NULL:
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| 371 | lexer.next(); |
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| 372 | return codeBuilder.constant(null); |
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| 373 | case Token.TRUE:
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| 374 | lexer.next(); |
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| 375 | return codeBuilder.constant(true); |
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| 376 | case Token.FALSE:
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| 377 | lexer.next(); |
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| 378 | return codeBuilder.constant(false); |
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| 379 | } |
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| 380 | return null; |
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| 381 | } |
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| 382 | |||
| 383 | private Arguments parseArgs() {
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| 384 | Arguments args = null;
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| 385 | while( true ) { |
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| 386 | Code arg = parseExpression(); |
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| 387 | 43519 | jjdelcerro | if( arg!=null ) { |
| 388 | if( args == null ) { |
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| 389 | args = codeBuilder.args(); |
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| 390 | } |
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| 391 | 43809 | jjdelcerro | ((DefaultCodeBuilder.BaseArguments)args).add(arg); |
| 392 | 43519 | jjdelcerro | } |
| 393 | 43512 | jjdelcerro | Token next = lexer.look(); |
| 394 | switch( next.getType() ) {
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| 395 | case Token.COMA:
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| 396 | lexer.next(); // Consume el ",".
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| 397 | break;
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| 398 | default:
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| 399 | return args;
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| 400 | } |
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| 401 | } |
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| 402 | } |
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| 403 | } |