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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package org.gvsig.expressionevaluator.impl; |
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import org.gvsig.expressionevaluator.Compiler; |
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import org.gvsig.expressionevaluator.Code.Caller.Arguments; |
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import org.gvsig.expressionevaluator.LexicalAnalyzer; |
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import org.gvsig.expressionevaluator.LexicalAnalyzer.Token; |
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import org.gvsig.expressionevaluator.Code; |
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import org.gvsig.expressionevaluator.CodeBuilder; |
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public class DefaultCompiler implements Compiler { |
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private LexicalAnalyzer lexer;
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private CodeBuilder codeBuilder;
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public DefaultCompiler() {
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this.lexer = new SQLLexicalAnalyzer(); |
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this.codeBuilder = new DefaultCodeBuilder(); |
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} |
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@Override
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public void setLexicalAnalyzer(LexicalAnalyzer lexer) { |
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this.lexer = lexer;
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} |
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@Override
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public void setCodeBuilder(CodeBuilder codeBuilder) { |
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this.codeBuilder = codeBuilder;
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} |
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@Override
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public Code compileExpression(String expression) { |
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this.lexer.setSource(expression);
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return parseExpression();
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} |
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private Code parseExpression() {
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return parse_relational();
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} |
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private Code parse_relational() {
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Code op1 = parse_not(); |
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Code op2; |
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while( true ) { |
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Token token = lexer.look(); |
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switch( token.getType() ) {
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case Token.OP_OR:
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lexer.next(); |
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op2 = parse_not(); |
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op1 = codeBuilder.or(op1, op2); |
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break;
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case Token.OP_AND:
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lexer.next(); |
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op2 = parse_not(); |
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op1 = codeBuilder.and(op1, op2); |
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break;
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default:
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return op1;
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} |
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} |
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} |
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private Code parse_not() {
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Code op1; |
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Token token = lexer.look(); |
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if( token.getType() == Token.OP_NOT ) {
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lexer.next(); |
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op1 = parse_conditional(); |
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op1 = codeBuilder.not(op1); |
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} else {
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op1 = parse_conditional(); |
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} |
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return op1;
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} |
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private Code parse_conditional() {
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Code op1 = parse_sum(); |
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Code op2; |
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while( true ) { |
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Token token = lexer.look(); |
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switch( token.getType() ) {
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case Token.OP_LT:
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lexer.next(); |
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op2 = parse_sum(); |
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op1 = codeBuilder.lt(op1, op2); |
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break;
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case Token.OP_GT:
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lexer.next(); |
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op2 = parse_sum(); |
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op1 = codeBuilder.gt(op1, op2); |
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break;
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case Token.OP_LE:
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lexer.next(); |
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op2 = parse_sum(); |
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op1 = codeBuilder.le(op1, op2); |
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break;
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case Token.OP_GE:
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lexer.next(); |
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op2 = parse_sum(); |
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op1 = codeBuilder.ge(op1, op2); |
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break;
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case Token.OP_EQ:
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lexer.next(); |
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op2 = parse_sum(); |
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op1 = codeBuilder.eq(op1, op2); |
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break;
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case Token.PRED_IS: {
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lexer.next(); |
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Token next = lexer.look(); |
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if( next.getType() == Token.NOTNULL ) {
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op1 = codeBuilder.is(op1, codeBuilder.constant(null));
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op1 = codeBuilder.not(op1); |
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} else {
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op2 = parse_sum(); |
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op1 = codeBuilder.is(op1, op2); |
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} |
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} |
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break;
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case Token.ISNULL:
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lexer.next(); |
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op1 = codeBuilder.is(op1, codeBuilder.constant(null));
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break;
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case Token.OP_NE:
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lexer.next(); |
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op2 = parse_sum(); |
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op1 = codeBuilder.ne(op1, op2); |
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break;
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case Token.PRED_LIKE:
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lexer.next(); |
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op2 = parse_sum(); |
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op1 = codeBuilder.like(op1, op2); |
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break;
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case Token.PRED_ILIKE:
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lexer.next(); |
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op2 = parse_sum(); |
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op1 = codeBuilder.ilike(op1, op2); |
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break;
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default:
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return op1;
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} |
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} |
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} |
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private Code parse_sum() {
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Code op1 = parse_factor(); |
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Code op2; |
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while( true ) { |
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Token token = lexer.look(); |
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switch( token.getType() ) {
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case Token.OP_ADD:
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lexer.next(); |
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op2 = parse_factor(); |
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op1 = codeBuilder.add(op1, op2); |
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break;
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case Token.OP_SUBST:
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lexer.next(); |
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op2 = parse_factor(); |
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op1 = codeBuilder.subst(op1, op2); |
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break;
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default:
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return op1;
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} |
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} |
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} |
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private Code parse_factor() {
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Code op1 = parse_termino(); |
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Code op2; |
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while( true ) { |
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Token token = lexer.look(); |
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switch( token.getType() ) {
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case Token.OP_MULT:
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lexer.next(); |
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op2 = parse_termino(); |
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op1 = codeBuilder.mult(op1, op2); |
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break;
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case Token.OP_DIV:
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lexer.next(); |
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op2 = parse_termino(); |
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op1 = codeBuilder.div(op1, op2); |
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break;
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case Token.OP_MOD:
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lexer.next(); |
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op2 = parse_termino(); |
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op1 = codeBuilder.mod(op1, op2); |
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break;
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default:
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return op1;
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} |
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} |
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} |
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private Code parse_termino() {
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Token token = lexer.look(); |
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switch( token.getType() ) {
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case Token.PARENTHESIS_OPEN: {
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lexer.next(); |
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Code value = parseExpression(); |
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Token next = lexer.next(); |
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if( next.getType() != Token.PARENTHESIS_CLOSE ) {
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throw new RuntimeException(); |
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} |
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return value;
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} |
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case Token.IDENTIFIER: {
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lexer.next(); |
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String id = (String) token.getLiteral(); |
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Token next = lexer.look(); |
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if( next.getType() == Token.PARENTHESIS_OPEN ) {
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lexer.next(); |
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Arguments args = parseArgs(); |
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next = lexer.next(); |
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if( next.getType() != Token.PARENTHESIS_CLOSE ) {
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throw new RuntimeException("Expected ')'."); |
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} |
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return codeBuilder.function(id, args);
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} else {
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return codeBuilder.identifier(id);
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} |
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} |
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case Token.STRING_LITERAL:
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lexer.next(); |
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return codeBuilder.constant(token.getValue());
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case Token.INTEGER_LITERAL:
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lexer.next(); |
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return codeBuilder.constant(token.getValue());
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case Token.FLOATING_POINT_LITERAL:
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lexer.next(); |
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return codeBuilder.constant(token.getValue());
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case Token.NULL:
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lexer.next(); |
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return codeBuilder.constant(null); |
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case Token.TRUE:
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lexer.next(); |
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return codeBuilder.constant(true); |
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case Token.FALSE:
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lexer.next(); |
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return codeBuilder.constant(false); |
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} |
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return null; |
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} |
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private Arguments parseArgs() {
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Arguments args = null;
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while( true ) { |
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Code arg = parseExpression(); |
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if( arg!=null ) { |
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if( args == null ) { |
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args = codeBuilder.args(); |
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} |
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args.add(arg); |
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} |
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Token next = lexer.look(); |
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switch( next.getType() ) {
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case Token.COMA:
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lexer.next(); // Consume el ",".
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break;
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default:
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return args;
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} |
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} |
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} |
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} |