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'rapiddweller Script' is an open source software library for resolving Java-like script expressions, forked from Databene Scripts written by Volker Bergmann.

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/*
 * Copyright (C) 2011-2014 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.rapiddweller.script;

import java.io.IOException;
import java.io.StringReader;
import java.util.List;

import org.antlr.runtime.ANTLRReaderStream;
import org.antlr.runtime.CommonToken;
import org.antlr.runtime.CommonTokenStream;
import org.antlr.runtime.ParserRuleReturnScope;
import org.antlr.runtime.RecognitionException;
import org.antlr.runtime.tree.CommonTree;
import com.rapiddweller.commons.ArrayFormat;
import com.rapiddweller.commons.Assert;
import com.rapiddweller.commons.Context;
import com.rapiddweller.commons.ParseUtil;
import com.rapiddweller.commons.StringUtil;
import com.rapiddweller.commons.SyntaxError;
import com.rapiddweller.script.antlr.DatabeneScriptLexer;
import com.rapiddweller.script.expression.AssignmentExpression;
import com.rapiddweller.script.expression.BeanConstruction;
import com.rapiddweller.script.expression.BitwiseAndExpression;
import com.rapiddweller.script.expression.BitwiseComplementExpression;
import com.rapiddweller.script.expression.BitwiseExclusiveOrExpression;
import com.rapiddweller.script.expression.BitwiseOrExpression;
import com.rapiddweller.script.expression.ConditionalAndExpression;
import com.rapiddweller.script.expression.ConditionalExpression;
import com.rapiddweller.script.expression.ConditionalOrExpression;
import com.rapiddweller.script.expression.ConstantExpression;
import com.rapiddweller.script.expression.DivisionExpression;
import com.rapiddweller.script.expression.EqualsExpression;
import com.rapiddweller.script.expression.FieldExpression;
import com.rapiddweller.script.expression.ForNameExpression;
import com.rapiddweller.script.expression.GreaterExpression;
import com.rapiddweller.script.expression.GreaterOrEqualsExpression;
import com.rapiddweller.script.expression.IndexExpression;
import com.rapiddweller.script.expression.InvocationExpression;
import com.rapiddweller.script.expression.LeftShiftExpression;
import com.rapiddweller.script.expression.LessExpression;
import com.rapiddweller.script.expression.LessOrEqualsExpression;
import com.rapiddweller.script.expression.LogicalComplementExpression;
import com.rapiddweller.script.expression.ModuloExpression;
import com.rapiddweller.script.expression.MultiplicationExpression;
import com.rapiddweller.script.expression.NotEqualsExpression;
import com.rapiddweller.script.expression.ParameterizedConstruction;
import com.rapiddweller.script.expression.RightShiftExpression;
import com.rapiddweller.script.expression.SubtractionExpression;
import com.rapiddweller.script.expression.SumExpression;
import com.rapiddweller.script.expression.TypeConvertingExpression;
import com.rapiddweller.script.expression.UnaryMinusExpression;
import com.rapiddweller.script.expression.UnsignedRightShiftExpression;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;

/**
 * Parses Benerator Script statements and converts expressions and statements to Java objects.

 * 

 * Created at 05.10.2009 18:52:31
 * @since 0.6.0
 * @author Volker Bergmann
 */

public class DatabeneScriptParser {
	
	private static final Logger LOGGER = LogManager.getLogger(DatabeneScriptParser.class);
	private static final Expression[] EMPTY_ARGUMENT_LIST = {};

    // interface -------------------------------------------------------------------------------------------------------

    public static WeightedSample[] parseWeightedLiteralList(String text) throws SyntaxError {
        if (StringUtil.isEmpty(text))
            return new WeightedSample[0];
        try {
        	com.rapiddweller.script.antlr.DatabeneScriptParser parser = parser(text);
        	com.rapiddweller.script.antlr.DatabeneScriptParser.weightedLiteralList_return r = parser.weightedLiteralList();
	        checkForSyntaxErrors(text, "weightedLiteralList", parser, r);
	        if (r != null) {
	        	CommonTree tree = (CommonTree) r.getTree();
	        	if (LOGGER.isDebugEnabled())
	        		LOGGER.debug("parsed " + text + " to " + tree.toStringTree());
	            return convertWeightedLiteralList(tree);
	        } else
	        	return null;
        } catch (RuntimeException e) {
        	if (e.getCause() instanceof RecognitionException)
        		throw mapToSyntaxError((RecognitionException) e.getCause(), text);
        	else
        		throw e;
        } catch (IOException e) {
        	throw new IllegalStateException("Encountered illegal state in weightedLiteralList parsing", e);
        } catch (RecognitionException e) {
        	e.printStackTrace();
        	throw mapToSyntaxError(e, text);
        }
    }
	
    public static Expression parseExpression(String text) throws SyntaxError {
        if (StringUtil.isEmpty(text))
            return null;
        try {
        	com.rapiddweller.script.antlr.DatabeneScriptParser parser = parser(text);
        	com.rapiddweller.script.antlr.DatabeneScriptParser.expression_return r = parser.expression();
	        checkForSyntaxErrors(text, "expression", parser, r);
	        	CommonTree tree = (CommonTree) r.getTree();
	        	if (LOGGER.isDebugEnabled())
	        		LOGGER.debug("parsed " + text + " to " + tree.toStringTree());
	            return convertNode(tree);
        } catch (RuntimeException e) {
        	if (e.getCause() instanceof RecognitionException)
        		throw mapToSyntaxError((RecognitionException) e.getCause(), text);
        	else
        		throw e;
        } catch (IOException e) {
        	throw new IllegalStateException("Encountered illegal state in regex parsing", e);
        } catch (RecognitionException e) {
        	throw mapToSyntaxError(e, text);
        }
    }

    public static WeightedTransition[] parseTransitionList(String text) throws SyntaxError {
        if (StringUtil.isEmpty(text))
            return null;
        try {
        	com.rapiddweller.script.antlr.DatabeneScriptParser parser = parser(text);
        	com.rapiddweller.script.antlr.DatabeneScriptParser.transitionList_return r = parser.transitionList();
	        checkForSyntaxErrors(text, "transitionList", parser, r);
	        if (r != null) {
	        	CommonTree tree = (CommonTree) r.getTree();
	        	if (LOGGER.isDebugEnabled())
	        		LOGGER.debug("parsed " + text + " to " + tree.toStringTree());
	            return convertTransitionList(tree);
	        } else
	        	return null;
        } catch (RuntimeException e) {
        	if (e.getCause() instanceof RecognitionException)
        		throw mapToSyntaxError((RecognitionException) e.getCause(), text);
        	else
        		throw e;
        } catch (IOException e) {
        	throw new IllegalStateException("Encountered illegal state in regex parsing", e);
        } catch (RecognitionException e) {
        	e.printStackTrace();
        	throw mapToSyntaxError(e, text);
        }
    }
	
    public static Expression[] parseBeanSpecList(String text) throws SyntaxError {
        if (StringUtil.isEmpty(text))
            return null;
        CommonTree tree = parseBeanSpecListAsTree(text);
        return convertBeanSpecList(tree);
    }
	
    public static CommonTree parseBeanSpecListAsTree(String text) throws SyntaxError {
        if (StringUtil.isEmpty(text))
            return null;
        try {
        	com.rapiddweller.script.antlr.DatabeneScriptParser parser = parser(text);
        	com.rapiddweller.script.antlr.DatabeneScriptParser.beanSpecList_return r = parser.beanSpecList();
	        checkForSyntaxErrors(text, "beanSpecList", parser, r);
	        if (r != null) {
	        	CommonTree tree = (CommonTree) r.getTree();
	        	if (LOGGER.isDebugEnabled())
	        		LOGGER.debug("parsed " + text + " to " + tree.toStringTree());
	            return tree;
	        } else
	        	return null;
        } catch (RuntimeException e) {
        	if (e.getCause() instanceof RecognitionException)
        		throw mapToSyntaxError((RecognitionException) e.getCause(), text);
        	else
        		throw e;
        } catch (IOException e) {
        	throw new IllegalStateException("Encountered illegal state in regex parsing", e);
        } catch (RecognitionException e) {
        	throw mapToSyntaxError(e, text);
        }
    }
	
	public static BeanSpec[] resolveBeanSpecList(String text, Context context) {
        if (StringUtil.isEmpty(text))
            return null;
        CommonTree tree = parseBeanSpecListAsTree(text);
        return resolveBeanSpecList(tree, context);
	}

	public static Expression parseBeanSpec(String text) throws SyntaxError {
        if (StringUtil.isEmpty(text))
            return null;
        try {
        	com.rapiddweller.script.antlr.DatabeneScriptParser parser = parser(text);
        	com.rapiddweller.script.antlr.DatabeneScriptParser.beanSpec_return r = parser.beanSpec();
	        checkForSyntaxErrors(text, "beanSpec", parser, r);
	        if (r != null) {
	        	CommonTree tree = (CommonTree) r.getTree();
	        	if (LOGGER.isDebugEnabled())
	        		LOGGER.debug("parsed " + text + " to " + tree.toStringTree());
	        	return convertBeanSpec(tree);
	        } else
	        	return null;
        } catch (RuntimeException e) {
        	if (e.getCause() instanceof RecognitionException)
        		throw mapToSyntaxError((RecognitionException) e.getCause(), text);
        	else
        		throw e;
        } catch (IOException e) {
        	throw new IllegalStateException("Encountered illegal state in regex parsing", e);
        } catch (RecognitionException e) {
        	throw mapToSyntaxError(e, text);
        }
    }
	
	public static BeanSpec resolveBeanSpec(String text, Context context) throws SyntaxError {
        if (StringUtil.isEmpty(text))
            return null;
        try {
        	com.rapiddweller.script.antlr.DatabeneScriptParser parser = parser(text);
        	com.rapiddweller.script.antlr.DatabeneScriptParser.beanSpec_return r = parser.beanSpec();
	        checkForSyntaxErrors(text, "beanSpec", parser, r);
	        if (r != null) {
	        	CommonTree tree = (CommonTree) r.getTree();
	        	if (LOGGER.isDebugEnabled())
	        		LOGGER.debug("parsed " + text + " to " + tree.toStringTree());
	        	return resolveBeanSpec(tree, context);
	        } else
	        	return null;
        } catch (RuntimeException e) {
        	if (e.getCause() instanceof RecognitionException)
        		throw mapToSyntaxError((RecognitionException) e.getCause(), text);
        	else
        		throw e;
        } catch (IOException e) {
        	throw new IllegalStateException("Encountered illegal state in regex parsing", e);
        } catch (RecognitionException e) {
        	throw mapToSyntaxError(e, text);
        }
    }
	
	// private helpers -------------------------------------------------------------------------------------------------

	private static void checkForSyntaxErrors(String text, String type,
			com.rapiddweller.script.antlr.DatabeneScriptParser parser, ParserRuleReturnScope r) {
		if (parser.getNumberOfSyntaxErrors() > 0)
			throw new SyntaxError("Illegal " + type, text, -1, -1);
		CommonToken stop = (CommonToken) r.stop;
		if (stop.getStopIndex() < StringUtil.trimRight(text).length() - 1) {
			if (stop.getStopIndex() == 0)
				throw new SyntaxError("Syntax error after " + stop.getText(), text);
			else
				throw new SyntaxError("Unspecific syntax error", text);
		}
	}
	
    private static com.rapiddweller.script.antlr.DatabeneScriptParser parser(String text) throws IOException {
	    DatabeneScriptLexer lex = new DatabeneScriptLexer(new ANTLRReaderStream(new StringReader(text)));
	    CommonTokenStream tokens = new CommonTokenStream(lex);
	    return new com.rapiddweller.script.antlr.DatabeneScriptParser(tokens);
    }
	
    private static SyntaxError mapToSyntaxError(RecognitionException cause, String text) {
    	return new SyntaxError("Error parsing Benerator Script expression", cause, 
    			text, cause.line, cause.charPositionInLine);
    }

    private static WeightedSample[] convertWeightedLiteralList(CommonTree node) throws SyntaxError {
    	if (!node.isNil())
    		return new WeightedSample[] { convertWeightedLiteral(node) };
    	else {
		    int childCount = node.getChildCount();
		    WeightedSample[] transitions = new WeightedSample[childCount];
		    for (int i = 0; i < childCount; i++)
		    	transitions[i] = convertWeightedLiteral(childAt(i, node));
		    return transitions;
    	}
    }

    private static WeightedSample convertWeightedLiteral(CommonTree node) throws SyntaxError {
		if (node.getType() == DatabeneScriptLexer.CARET) {
			Expression value = convertNode(childAt(0, node));
			Expression weight = null;
			if (node.getChildCount() > 1)
				weight = new TypeConvertingExpression(convertNode(childAt(1, node)), Double.class);
			else
				weight = new ConstantExpression(1.);
			return new WeightedSample(value.evaluate(null), weight.evaluate(null));
		} else
			return new WeightedSample(convertNode(node).evaluate(null), 1.); 
	}

    private static WeightedTransition[] convertTransitionList(CommonTree node) throws SyntaxError {
    	if (node.getType() == DatabeneScriptLexer.ARROW)
    		return new WeightedTransition[] { convertTransition(node) };
    	else if (node.isNil()) {
		    int childCount = node.getChildCount();
		    WeightedTransition[] transitions = new WeightedTransition[childCount];
		    for (int i = 0; i < childCount; i++)
		    	transitions[i] = convertTransition(childAt(i, node));
		    return transitions;
    	} else
    		throw new SyntaxError("Unexpected token in transition list: ", node.getToken().getText(), 
    				node.getLine(), node.getCharPositionInLine());
    }

	private static WeightedTransition convertTransition(CommonTree node) throws SyntaxError {
		Assert.isTrue(node.getType() == DatabeneScriptLexer.ARROW, "expected transition, found: " + node.getToken());
		Expression from = convertNode(childAt(0, node));
		Expression to = convertNode(childAt(1, node));
		Expression weight;
		if (node.getChildCount() > 2)
			weight = new TypeConvertingExpression(convertNode(childAt(2, node)), Double.class);
		else
			weight = new ConstantExpression(1.);
		return new WeightedTransition(from.evaluate(null), to.evaluate(null), weight.evaluate(null));
	}

    private static Expression[] convertBeanSpecList(CommonTree node) throws SyntaxError {
    	if (node.getType() == DatabeneScriptLexer.BEANSPEC)
    		return new Expression[] { convertBeanSpec(node) };
    	else if (node.isNil()) {
		    int childCount = node.getChildCount();
		    Expression[] specs = new Expression[childCount];
		    for (int i = 0; i < childCount; i++)
		    	specs[i] = convertBeanSpec(childAt(i, node));
		    return specs;
    	} else
    		throw new SyntaxError("Unexpected token", node.getToken().getText(), node.getLine(), node.getCharPositionInLine());
    }

    private static BeanSpec[] resolveBeanSpecList(CommonTree node, Context context) throws SyntaxError {
    	if (node.getType() == DatabeneScriptLexer.BEANSPEC)
    		return new BeanSpec[] { resolveBeanSpec(node, context) };
    	else if (node.isNil()) {
		    int childCount = node.getChildCount();
		    BeanSpec[] specs = new BeanSpec[childCount];
		    for (int i = 0; i < childCount; i++)
		    	specs[i] = resolveBeanSpec(childAt(i, node), context);
		    return specs;
    	} else
    		throw new SyntaxError("Unexpected token", node.getToken().getText(), node.getLine(), node.getCharPositionInLine());
    }

	private static Expression convertBeanSpec(CommonTree node) throws SyntaxError {
		Assert.isTrue(node.getType() == DatabeneScriptLexer.BEANSPEC, "BEANSPEC expected, found: " + node.getToken());
		node = childAt(0, node);
		if (node.getType() == DatabeneScriptLexer.QUALIFIEDNAME)
			return new QNBeanSpecExpression(convertQualifiedNameToStringArray(node));
		else if (node.getType() == DatabeneScriptLexer.IDENTIFIER)
			return new QNBeanSpecExpression(new String[] { node.getText() });
		else if (node.getType() == DatabeneScriptLexer.BEAN)
			return convertBean(node);
		else
			return convertNode(node);
	}

	private static BeanSpec resolveBeanSpec(CommonTree node, Context context) throws SyntaxError {
		Assert.isTrue(node.getType() == DatabeneScriptLexer.BEANSPEC, "BEANSPEC expected, found: " + node.getToken());
		node = childAt(0, node);
		if (node.getType() == DatabeneScriptLexer.QUALIFIEDNAME)
			return new QNBeanSpecExpression(convertQualifiedNameToStringArray(node)).resolve(context);
		else if (node.getType() == DatabeneScriptLexer.IDENTIFIER)
			return new QNBeanSpecExpression(new String[] { node.getText() }).resolve(context);
		else if (node.getType() == DatabeneScriptLexer.BEAN)
			return BeanSpec.createConstruction(convertBean(node).evaluate(context));
		else if (node.getType() == DatabeneScriptLexer.CONSTRUCTOR)
			return BeanSpec.createConstruction(convertNode(node).evaluate(context));
		else
			return BeanSpec.createReference(convertNode(node).evaluate(context));
	}

	private static Expression convertNode(CommonTree node) throws SyntaxError {
    	switch (node.getType()) {
			case DatabeneScriptLexer.NULL: return new ConstantExpression(null);
			case DatabeneScriptLexer.BOOLEANLITERAL: return convertBooleanLiteral(node);
			case DatabeneScriptLexer.INTLITERAL: return convertIntLiteral(node);
			case DatabeneScriptLexer.DECIMALLITERAL: return convertDecimalLiteral(node);
    		case DatabeneScriptLexer.STRINGLITERAL: return convertStringLiteral(node);
    		case DatabeneScriptLexer.IDENTIFIER: return convertIdentifier(node);
    		case DatabeneScriptLexer.QUALIFIEDNAME: return convertQualifiedName(node);
    		case DatabeneScriptLexer.TYPE: return convertType(node);
			case DatabeneScriptLexer.CONSTRUCTOR: return convertCreator(node);
			case DatabeneScriptLexer.BEAN: return convertBean(node);
    		case DatabeneScriptLexer.INVOCATION: return convertInvocation(node);
    		case DatabeneScriptLexer.SUBINVOCATION: return convertSubInvocation(node);
			case DatabeneScriptLexer.INDEX: return convertIndex(node);
			case DatabeneScriptLexer.FIELD: return convertField(node);
			case DatabeneScriptLexer.CAST: return convertCast(node);
			case DatabeneScriptLexer.NEGATION: return convertNegation(node);
			case DatabeneScriptLexer.BANG: return convertLogicalComplement(node);
			case DatabeneScriptLexer.TILDE: return convertBitwiseComplement(node);
			case DatabeneScriptLexer.PLUS: return convertPlus(node);
			case DatabeneScriptLexer.SUB: return convertMinus(node);
			case DatabeneScriptLexer.STAR: return convertStar(node);
			case DatabeneScriptLexer.SLASH: return convertSlash(node);
			case DatabeneScriptLexer.PERCENT: return convertPercent(node);
			case DatabeneScriptLexer.AMP: return convertAnd(node);
			case DatabeneScriptLexer.BAR: return convertInclusiveOr(node);
			case DatabeneScriptLexer.CARET: return convertExclusiveOr(node);
			case DatabeneScriptLexer.EQEQ: return convertEquals(node);
			case DatabeneScriptLexer.BANGEQ: return convertNotEquals(node);
			case DatabeneScriptLexer.LT: return convertLess(node);
			case DatabeneScriptLexer.LE: return convertLessOrEquals(node);
			case DatabeneScriptLexer.GT: return convertGreater(node);
			case DatabeneScriptLexer.GE: return convertGreaterOrEquals(node);
			case DatabeneScriptLexer.SHIFT_LEFT: return convertShiftLeft(node);
			case DatabeneScriptLexer.SHIFT_RIGHT: return convertShiftRight(node);
			case DatabeneScriptLexer.SHIFT_RIGHT2: return convertShiftRight2(node);
			case DatabeneScriptLexer.AMPAMP: return convertConditionalAnd(node);
			case DatabeneScriptLexer.BARBAR: return convertConditionalOr(node);
			case DatabeneScriptLexer.QUES: return convertConditionalExpression(node);
			case DatabeneScriptLexer.EQ: return convertAssignment(node);
			default: throw new SyntaxError("Unknown token type", String.valueOf(node.getType()), 
					node.getLine(), node.getCharPositionInLine());
    	}
    }

	private static Expression convertBooleanLiteral(CommonTree node) {
		return new ConstantExpression(ParseUtil.parseBoolean(node.getText()));
    }

    private static Expression convertStringLiteral(CommonTree node) {
		String rawString = node.getText();
		String text = rawString.substring(1, rawString.length() - 1);
		text = StringUtil.unescape(text);
		return new ConstantExpression(text);
    }

    private static Expression convertIdentifier(CommonTree node) {
		return new ConstantExpression(node.getText());
    }

    private static Expression convertQualifiedName(CommonTree node) {
    	return new QNExpression(convertQualifiedNameToStringArray(node));
    }

    private static String[] convertQualifiedNameToStringArray(CommonTree node) {
    	int childCount = node.getChildCount();
		String[] result = new String[childCount];
    	List childNodes = getChildNodes(node);
    	for (int i = 0; i < childCount; i++)
    		result[i] = childNodes.get(i).getText();
		return result;
    }

    private static Expression> convertType(CommonTree node) {
    	String[] classNameParts = convertQualifiedNameToStringArray(childAt(0, node));
    	final String className = ArrayFormat.format(".", classNameParts);
		PrimitiveType primitiveType = PrimitiveType.getInstance(className);
		if (primitiveType != null)
			return new ConstantExpression>(primitiveType.getJavaType());
		else
			return new ForNameExpression(new ConstantExpression(className));
    }

    private static Expression convertIntLiteral(CommonTree node) {
		String text = node.getText();
		Number number = null;
		if (text.length() > 10)
			number = Long.parseLong(text);
		else if (text.length() == 10) {
			long l = Long.parseLong(text);
			if (l <= Integer.MAX_VALUE)
				number = (int) l;
			else
				number = l;
		} else
			number = Integer.parseInt(text);
		return new ConstantExpression(number);
    }

    private static Expression convertDecimalLiteral(CommonTree node) {
		return new ConstantExpression(Double.parseDouble(node.getText()));
    }

    private static Expression convertCreator(CommonTree node) throws SyntaxError {
		List childNodes = getChildNodes(node);
    	String className = parseQualifiedNameOfClass(childNodes.get(0));
    	Expression[] params = parseArguments(childNodes.get(1));
    	return new ParameterizedConstruction(className, params);
    }

    private static Expression convertBean(CommonTree node) throws SyntaxError {
		List childNodes = getChildNodes(node);
    	String className = parseQualifiedNameOfClass(childNodes.get(0));
    	Assignment[] props = parseFieldAssignments(childNodes, 1);
    	return new BeanConstruction(className, props);
    }

    private static Assignment[] parseFieldAssignments(List nodes, int firstIndex) throws SyntaxError {
    	Assignment[] assignments = new Assignment[nodes.size() - firstIndex];
    	for (int i = firstIndex; i < nodes.size(); i++) {
    		CommonTree assignmentNode = nodes.get(i);
    		CommonTree nameNode = childAt(0, assignmentNode);
    		String name = (nameNode.getType() == DatabeneScriptLexer.QUALIFIEDNAME ? childAt(0, nameNode).getText() : nameNode.getText());
    		CommonTree exNode = childAt(1, assignmentNode);
    		Expression ex = convertNode(exNode);
			assignments[i - firstIndex] = new Assignment(name, ex);
    	}
		return assignments;
    }

	private static Expression convertInvocation(CommonTree node) throws SyntaxError {
    	String[] qn = convertQualifiedNameToStringArray(childAt(0, node));
    	Expression[] argExpressions = parseArguments(childAt(1, node));
    	return new QNInvocationExpression(qn, argExpressions);
    }

    private static Expression convertSubInvocation(CommonTree node) throws SyntaxError {
    	Expression object = convertNode(childAt(0, node));
    	String methodMame = (String) convertNode(childAt(1, node)).evaluate(null);
    	Expression[] argsExpressions = parseArguments(childAt(2, node));
    	return new InvocationExpression(object, methodMame, argsExpressions);
    }

    private static Expression convertIndex(CommonTree node) throws SyntaxError {
		return new IndexExpression(convertNode(childAt(0, node)), convertNode(childAt(1, node)));
    }

    private static Expression convertField(CommonTree node) throws SyntaxError {
    	return new FieldExpression(convertNode(childAt(0, node)), convertIdentifier(childAt(1, node)).evaluate(null));
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    private static Expression convertCast(CommonTree node) throws SyntaxError {
    	Class targetType = (Class) convertNode(childAt(0, node)).evaluate(null);
		Expression sourceExpression = convertNode(childAt(1, node));
		return new TypeConvertingExpression(sourceExpression, targetType);
    }

    @SuppressWarnings({ "rawtypes", "unchecked" })
	private static Expression convertNegation(CommonTree node) throws SyntaxError {
		return new UnaryMinusExpression(convertNode(childAt(0, node)));
    }

    private static Expression convertLogicalComplement(CommonTree node) throws SyntaxError {
		return new LogicalComplementExpression(convertNode(childAt(0, node)));
    }

    private static Expression convertBitwiseComplement(CommonTree node) throws SyntaxError {
		return new BitwiseComplementExpression(convertNode(childAt(0, node)));
    }

	private static String parseQualifiedNameOfClass(CommonTree node) {
		List childNodes = getChildNodes(node);
		StringBuffer className = new StringBuffer();
		for (CommonTree childNode : childNodes) {
			if (className.length() > 0)
				className.append('.');
			className.append(childNode.getText());
		}
		return className.toString();
    }

    private static Expression[] parseArguments(CommonTree node) throws SyntaxError {
		List childNodes = getChildNodes(node);
		if (childNodes == null)
			return EMPTY_ARGUMENT_LIST;
		Expression[] result = new Expression[childNodes.size()];
		for (int i = 0; i < childNodes.size(); i++) {
			CommonTree childNode = childNodes.get(i);
			result[i] = convertNode(childNode);
		}
		return result;
    }

	@SuppressWarnings({ "unchecked", "rawtypes" })
	private static Expression convertPlus(CommonTree node) throws SyntaxError {
		SumExpression result = new SumExpression();
		for (CommonTree child : getChildNodes(node))
			result.addTerm((Expression) convertNode(child));
		return result;
    }

	@SuppressWarnings({ "unchecked", "rawtypes" })
	private static Expression convertMinus(CommonTree node) throws SyntaxError {
		SubtractionExpression result = new SubtractionExpression();
		for (CommonTree child : getChildNodes(node))
			result.addTerm((Expression) convertNode(child));
		return result;
    }

	@SuppressWarnings({ "unchecked", "rawtypes" })
	private static Expression convertStar(CommonTree node) throws SyntaxError {
		MultiplicationExpression result = new MultiplicationExpression();
		for (CommonTree child : getChildNodes(node))
			result.addTerm((Expression) convertNode(child));
		return result;
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
	private static Expression convertSlash(CommonTree node) throws SyntaxError {
    	DivisionExpression result = new DivisionExpression();
		for (CommonTree child : getChildNodes(node))
			result.addTerm((Expression) convertNode(child));
		return result;
    }

    private static Expression convertPercent(CommonTree node) throws SyntaxError {
		return new ModuloExpression(convertNode(childAt(0, node)), convertNode(childAt(1, node)));
    }

    private static Expression convertShiftLeft(CommonTree node) throws SyntaxError {
		return new LeftShiftExpression(convertNode(childAt(0, node)), convertNode(childAt(1, node)));
    }

    private static Expression convertShiftRight(CommonTree node) throws SyntaxError {
		return new RightShiftExpression(convertNode(childAt(0, node)), convertNode(childAt(1, node)));
    }

    private static Expression convertShiftRight2(CommonTree node) throws SyntaxError {
		return new UnsignedRightShiftExpression(convertNode(childAt(0, node)), convertNode(childAt(1, node)));
    }

    private static Expression convertAnd(CommonTree node) throws SyntaxError {
		return new BitwiseAndExpression(convertNode(childAt(0, node)), convertNode(childAt(1, node)));
    }

    private static Expression convertInclusiveOr(CommonTree node) throws SyntaxError {
		return new BitwiseOrExpression(convertNode(childAt(0, node)), convertNode(childAt(1, node)));
    }

    private static Expression convertExclusiveOr(CommonTree node) throws SyntaxError {
		return new BitwiseExclusiveOrExpression(convertNode(childAt(0, node)), convertNode(childAt(1, node)));
    }

    private static Expression convertEquals(CommonTree node) throws SyntaxError {
		return new EqualsExpression(convertNode(childAt(0, node)), convertNode(childAt(1, node)));
    }
    
    private static Expression convertNotEquals(CommonTree node) throws SyntaxError {
		return new NotEqualsExpression(convertNode(childAt(0, node)), convertNode(childAt(1, node)));
    }
    
    private static Expression convertLess(CommonTree node) throws SyntaxError {
		return new LessExpression(convertNode(childAt(0, node)), convertNode(childAt(1, node)));
    }

    private static Expression convertLessOrEquals(CommonTree node) throws SyntaxError {
		return new LessOrEqualsExpression(convertNode(childAt(0, node)), convertNode(childAt(1, node)));
    }

    private static Expression convertGreater(CommonTree node) throws SyntaxError {
		return new GreaterExpression(convertNode(childAt(0, node)), convertNode(childAt(1, node)));
    }

    private static Expression convertGreaterOrEquals(CommonTree node) throws SyntaxError {
		return new GreaterOrEqualsExpression(convertNode(childAt(0, node)), convertNode(childAt(1, node)));
    }

    @SuppressWarnings("unchecked")
	private static Expression convertConditionalOr(CommonTree node) throws SyntaxError {
		ConditionalOrExpression result = new ConditionalOrExpression("||");
		for (CommonTree child : getChildNodes(node))
			result.addTerm((Expression) convertNode(child));
		return result;
    }

    @SuppressWarnings("unchecked")
	private static Expression convertConditionalAnd(CommonTree node) throws SyntaxError {
    	ConditionalAndExpression result = new ConditionalAndExpression("&&");
    	for (CommonTree child : getChildNodes(node))
    		result.addTerm((Expression) convertNode(child));
		return result;
    }
    
    @SuppressWarnings({ "unchecked", "rawtypes" })
    private static Expression convertConditionalExpression(CommonTree node) throws SyntaxError {
		return new ConditionalExpression(
				convertNode(childAt(0, node)),  // condition
				convertNode(childAt(1, node)),  // true alternative 
				convertNode(childAt(2, node))); // false alternative
    }
    
	private static Expression convertAssignment(CommonTree node) throws SyntaxError {
		return new AssignmentExpression(
				convertQualifiedNameToStringArray(childAt(0, node)),
				convertNode(childAt(1, node)));
    }

    // CommonTree helpers ----------------------------------------------------------------------------------------------

    private static CommonTree childAt(int index, CommonTree node) {
	    return (CommonTree) node.getChild(index);
    }

	@SuppressWarnings("unchecked")
    private static List getChildNodes(CommonTree node) {
	    return node.getChildren();
    }

}
    

    

    

            

    

            



    
    






    
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