plugins/org.eclipse.acceleo.aql/src/org/eclipse/acceleo/aql/parser/AcceleoAstSerializer.java - acceleo/org.eclipse.acceleo - Git at Google

 /*******************************************************************************
  * Copyright (c) 2020 Obeo.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     Obeo - initial API and implementation
  *******************************************************************************/
 package org.eclipse.acceleo.aql.parser;

 import java.util.ArrayList;
 import java.util.List;

 import org.eclipse.acceleo.ASTNode;
 import org.eclipse.acceleo.Binding;
 import org.eclipse.acceleo.Block;
 import org.eclipse.acceleo.BlockComment;
 import org.eclipse.acceleo.Comment;
 import org.eclipse.acceleo.CommentBody;
 import org.eclipse.acceleo.Documentation;
 import org.eclipse.acceleo.Expression;
 import org.eclipse.acceleo.ExpressionStatement;
 import org.eclipse.acceleo.FileStatement;
 import org.eclipse.acceleo.ForStatement;
 import org.eclipse.acceleo.IfStatement;
 import org.eclipse.acceleo.Import;
 import org.eclipse.acceleo.LetStatement;
 import org.eclipse.acceleo.Metamodel;
 import org.eclipse.acceleo.Module;
 import org.eclipse.acceleo.ModuleDocumentation;
 import org.eclipse.acceleo.ModuleElement;
 import org.eclipse.acceleo.ModuleElementDocumentation;
 import org.eclipse.acceleo.ModuleReference;
 import org.eclipse.acceleo.NewLineStatement;
 import org.eclipse.acceleo.ProtectedArea;
 import org.eclipse.acceleo.Query;
 import org.eclipse.acceleo.Template;
 import org.eclipse.acceleo.TextStatement;
 import org.eclipse.acceleo.Variable;
 import org.eclipse.acceleo.query.parser.AstSerializer;
 import org.eclipse.acceleo.util.AcceleoSwitch;

 /**
  * Serializes {@link ASTNode}.
  *
  * @author <a href="mailto:yvan.lussaud@obeo.fr">Yvan Lussaud</a>
  */
 public class AcceleoAstSerializer extends AcceleoSwitch<Object> {

 	/**
 	 * The indentation space.
 	 */
 	private static final String INDENTATION_SPACE = "  ";

 	/**
 	 * A space.
 	 */
 	private static final String SPACE = " ";

 	/**
 	 * A new line.
 	 */
 	private static final String NEW_LINE = "\n";

 	/**
 	 * A dummy {@link Object} to prevent switching in super types.
 	 */
 	private static final Object DUMMY = new Object();

 	/**
 	 * The {@link AstSerializer}.
 	 */
 	private AstSerializer querySerializer = new AstSerializer();

 	/**
 	 * The current binding separator.
 	 */
 	private String bindingSeparator;

 	/**
 	 * The resulting {@link StringBuilder}.
 	 */
 	private StringBuilder builder;

 	/**
 	 * The current indentation.
 	 */
 	private String currentIndentation = "";

 	/**
 	 * The current block header start column.
 	 */
 	private int currentBlockHeaderStartColumn;

 	/**
 	 * Serializes the given {@link ASTNode}.
 	 *
 	 * @param node
 	 *            the {@link ASTNode}
 	 * @return the serialized {@link ASTNode}
 	 */
 	public String serialize(ASTNode node) {
 		builder = new StringBuilder();

 		currentIndentation = "";
 		updateCurrentBlockHeaderStartColumn();
 		doSwitch(node);

 		return builder.toString();
 	}

 	@Override
 	public Object caseBinding(Binding binding) {
 		builder.append(binding.getName());
 		if (binding.getType() != null) {
 			builder.append(" : ");
 			builder.append(querySerializer.serialize(binding.getType().getAst()));
 		}
 		builder.append(SPACE);
 		builder.append(bindingSeparator);
 		builder.append(SPACE);
 		doSwitch(binding.getInitExpression());

 		return DUMMY;
 	}

 	@Override
 	public Object caseBlock(Block block) {
 		final String savedIndentation = currentIndentation;
 		try {
 			final StringBuilder blockIndentation = new StringBuilder();
 			for (int i = 0; i < currentBlockHeaderStartColumn; i++) {
 				blockIndentation.append(SPACE);
 			}
 			if (block.isInlined()) {
 				currentIndentation = "";
 			} else {
 				if (block.getStatements().isEmpty()) {
 					currentIndentation = blockIndentation.toString();
 				} else {
 					currentIndentation = blockIndentation.toString() + INDENTATION_SPACE;
 				}
 				insertNewLine();
 			}
 			if (!block.getStatements().isEmpty()) {
 				for (int i = 0; i < block.getStatements().size() - 1; i++) {
 					doSwitch(block.getStatements().get(i));
 				}
 				currentIndentation = blockIndentation.toString();
 				doSwitch(block.getStatements().get(block.getStatements().size() - 1));
 			}
 		} finally {
 			currentIndentation = savedIndentation;
 		}

 		return DUMMY;
 	}

 	@Override
 	public Object caseBlockComment(BlockComment blockComment) {

 		builder.append(AcceleoParser.BLOCK_COMMENT_START);
 		doSwitch(blockComment.getBody());
 		builder.append(AcceleoParser.BLOCK_COMMENT_END);

 		return DUMMY;
 	}

 	@Override
 	public Object caseComment(Comment comment) {
 		builder.append(AcceleoParser.COMMENT_START);
 		doSwitch(comment.getBody());
 		builder.append(AcceleoParser.COMMENT_END);

 		return DUMMY;
 	}

 	@Override
 	public Object caseCommentBody(CommentBody commentBody) {
 		builder.append(commentBody.getValue());

 		return DUMMY;
 	}

 	@Override
 	public Object caseDocumentation(Documentation documentation) {

 		builder.append(AcceleoParser.DOCUMENTATION_START);
 		doSwitch(documentation.getBody());
 		builder.append(AcceleoParser.DOCUMENTATION_END);

 		return DUMMY;
 	}

 	@Override
 	public Object caseExpression(Expression expression) {
 		builder.append(querySerializer.serialize(expression.getAst().getAst()));

 		return DUMMY;
 	}

 	@Override
 	public Object caseExpressionStatement(ExpressionStatement expressionStatement) {
 		builder.append(AcceleoParser.EXPRESSION_STATEMENT_START);
 		doSwitch(expressionStatement.getExpression());
 		builder.append(AcceleoParser.EXPRESSION_STATEMENT_END);
 		if (expressionStatement.isNewLineNeeded()) {
 			insertNewLine();
 		}
 		return DUMMY;
 	}

 	@Override
 	public Object caseFileStatement(FileStatement fileStatement) {
 		updateCurrentBlockHeaderStartColumn();
 		builder.append(AcceleoParser.FILE_HEADER_START);
 		builder.append(AcceleoParser.OPEN_PARENTHESIS);
 		doSwitch(fileStatement.getUrl());
 		builder.append(AcceleoParser.COMMA);
 		builder.append(SPACE);
 		builder.append(fileStatement.getMode().getName());
 		if (fileStatement.getCharset() != null) {
 			builder.append(AcceleoParser.COMMA);
 			builder.append(SPACE);
 			doSwitch(fileStatement.getCharset());
 		}
 		builder.append(AcceleoParser.CLOSE_PARENTHESIS);
 		builder.append(AcceleoParser.FILE_HEADER_END);
 		doSwitch(fileStatement.getBody());
 		builder.append(AcceleoParser.FILE_END);
 		return DUMMY;
 	};

 	@Override
 	public Object caseForStatement(ForStatement forStatement) {
 		updateCurrentBlockHeaderStartColumn();
 		builder.append(AcceleoParser.FOR_HEADER_START);
 		builder.append(AcceleoParser.OPEN_PARENTHESIS);
 		bindingSeparator = AcceleoParser.PIPE;
 		if (forStatement.getBinding() != null) {
 			doSwitch(forStatement.getBinding());
 		}
 		builder.append(AcceleoParser.CLOSE_PARENTHESIS);

 		if (forStatement.getSeparator() != null) {
 			builder.append(SPACE);
 			builder.append(AcceleoParser.FOR_SEPARATOR);
 			doSwitch(forStatement.getSeparator());
 			builder.append(AcceleoParser.CLOSE_PARENTHESIS);
 		}
 		builder.append(AcceleoParser.FOR_HEADER_END);
 		doSwitch(forStatement.getBody());
 		builder.append(AcceleoParser.FOR_END);

 		return DUMMY;
 	}

 	@Override
 	public Object caseIfStatement(IfStatement ifStatement) {
 		updateCurrentBlockHeaderStartColumn();
 		builder.append(AcceleoParser.IF_HEADER_START);
 		builder.append(AcceleoParser.OPEN_PARENTHESIS);
 		doSwitch(ifStatement.getCondition());
 		builder.append(AcceleoParser.CLOSE_PARENTHESIS);
 		builder.append(AcceleoParser.IF_HEADER_END);
 		if (ifStatement.getThen() != null) {
 			doSwitch(ifStatement.getThen());
 		}
 		if (ifStatement.getElse() != null) {
 			final Block elseBlock = ifStatement.getElse();
 			generateElse(elseBlock);
 		}
 		builder.append(AcceleoParser.IF_END);

 		return DUMMY;
 	}

 	/**
 	 * Serializes the given {@link Block} as a elseif or a else.
 	 *
 	 * @param block
 	 *            the {@link Block}
 	 */
 	private void generateElse(Block block) {
 		updateCurrentBlockHeaderStartColumn();
 		if (block.getStatements().size() == 1 && block.getStatements().get(0) instanceof IfStatement) {
 			final IfStatement ifStatement = (IfStatement)block.getStatements().get(0);
 			builder.append(AcceleoParser.IF_ELSEIF);
 			builder.append(AcceleoParser.OPEN_PARENTHESIS);
 			doSwitch(ifStatement.getCondition());
 			builder.append(AcceleoParser.CLOSE_PARENTHESIS);
 			builder.append(AcceleoParser.IF_HEADER_END);
 			doSwitch(ifStatement.getThen());
 			if (ifStatement.getElse() != null) {
 				final Block elseBlock = ifStatement.getElse();
 				generateElse(elseBlock);
 			}
 		} else {
 			builder.append(AcceleoParser.IF_ELSE);
 			doSwitch(block);
 		}
 	}

 	@Override
 	public Object caseImport(Import imp) {
 		builder.append(AcceleoParser.IMPORT_START);
 		doSwitch(imp.getModule());
 		builder.append(AcceleoParser.IMPORT_END);
 		return DUMMY;
 	}

 	@Override
 	public Object caseLetStatement(LetStatement letStatement) {
 		updateCurrentBlockHeaderStartColumn();
 		builder.append(AcceleoParser.LET_HEADER_START);
 		if (!letStatement.getVariables().isEmpty()) {
 			final StringBuilder previousBuilder = builder;
 			try {
 				builder = new StringBuilder();
 				bindingSeparator = AcceleoParser.EQUAL;
 				for (Binding binding : letStatement.getVariables()) {
 					doSwitch(binding);
 					builder.append(AcceleoParser.COMMA);
 					builder.append(SPACE);
 				}
 				previousBuilder.append(builder.substring(0, builder.length() - 2));
 			} finally {
 				builder = previousBuilder;
 			}
 		}
 		builder.append(AcceleoParser.LET_HEADER_END);
 		doSwitch(letStatement.getBody());
 		builder.append(AcceleoParser.LET_END);

 		return DUMMY;
 	};

 	@Override
 	public Object caseMetamodel(Metamodel metamodel) {
 		builder.append(AcceleoParser.QUOTE);
 		if (metamodel.getReferencedPackage() != null) {
 			builder.append(metamodel.getReferencedPackage().getNsURI());
 		}
 		builder.append(AcceleoParser.QUOTE);

 		return DUMMY;
 	}

 	@Override
 	public Object caseModule(Module module) {
 		if (module.getDocumentation() != null) {
 			doSwitch(module.getDocumentation());
 			insertNewLine();
 		}
 		builder.append(AcceleoParser.MODULE_HEADER_START);
 		builder.append(module.getName());
 		builder.append(AcceleoParser.OPEN_PARENTHESIS);
 		if (!module.getMetamodels().isEmpty()) {
 			final StringBuilder previousBuilder = builder;
 			try {
 				builder = new StringBuilder();
 				for (Metamodel metamodel : module.getMetamodels()) {
 					doSwitch(metamodel);
 					builder.append(AcceleoParser.COMMA);
 					builder.append(SPACE);
 				}
 				previousBuilder.append(builder.substring(0, builder.length() - 2));
 			} finally {
 				builder = previousBuilder;
 			}
 		}
 		builder.append(AcceleoParser.CLOSE_PARENTHESIS);
 		if (module.getExtends() != null) {
 			builder.append(SPACE);
 			builder.append(AcceleoParser.EXTENDS);
 			doSwitch(module.getExtends());
 		}
 		builder.append(AcceleoParser.MODULE_HEADER_END);

 		if (!module.getImports().isEmpty()) {
 			insertNewLine();
 			for (Import importedModule : module.getImports()) {
 				insertNewLine();
 				doSwitch(importedModule);
 			}
 		}

 		final List<ModuleElement> moduleElements = getSignificantModuleElements(module);
 		final int numberOfElements = moduleElements.size();
 		int currentElementIndex = 0;
 		if (!moduleElements.isEmpty()) {
 			insertNewLine();
 			for (ModuleElement moduleElement : moduleElements) {
 				insertNewLine();
 				doSwitch(moduleElement);
 				currentElementIndex++;
 				if ((currentElementIndex < numberOfElements) && (moduleElement instanceof Template
 						|| moduleElement instanceof Query)) {
 					insertNewLine();
 				}
 			}
 		}

 		return DUMMY;
 	}

 	private List<ModuleElement> getSignificantModuleElements(Module module) {
 		final List<ModuleElement> res = new ArrayList<ModuleElement>();

 		for (ModuleElement moduleElement : module.getModuleElements()) {
 			if (!(moduleElement instanceof Documentation) || ((Documentation)moduleElement)
 					.getDocumentedElement() == null) {
 				res.add(moduleElement);
 			}
 		}

 		return res;
 	}

 	@Override
 	public Object caseModuleDocumentation(ModuleDocumentation moduleDocumentation) {
 		builder.append(AcceleoParser.DOCUMENTATION_START);
 		doSwitch(moduleDocumentation.getBody());
 		builder.append(AcceleoParser.DOCUMENTATION_END);
 		return DUMMY;
 	}

 	@Override
 	public Object caseModuleElementDocumentation(ModuleElementDocumentation moduleElementDocumentation) {
 		builder.append(AcceleoParser.DOCUMENTATION_START);
 		doSwitch(moduleElementDocumentation.getBody());
 		builder.append(AcceleoParser.DOCUMENTATION_END);
 		return DUMMY;
 	}

 	@Override
 	public Object caseModuleReference(ModuleReference moduleReference) {
 		builder.append(moduleReference.getQualifiedName());
 		return DUMMY;
 	}

 	@Override
 	public Object caseProtectedArea(ProtectedArea protectedArea) {
 		updateCurrentBlockHeaderStartColumn();
 		builder.append(AcceleoParser.PROTECTED_AREA_HEADER_START);
 		builder.append(AcceleoParser.OPEN_PARENTHESIS);
 		doSwitch(protectedArea.getId());
 		builder.append(AcceleoParser.CLOSE_PARENTHESIS);
 		builder.append(AcceleoParser.PROTECTED_AREA_HEADER_END);
 		doSwitch(protectedArea.getBody());
 		builder.append(AcceleoParser.PROTECTED_AREA_END);

 		return DUMMY;
 	}

 	@Override
 	public Object caseQuery(Query query) {
 		if (query.getDocumentation() != null) {
 			doSwitch(query.getDocumentation());
 			insertNewLine();
 		}
 		builder.append(AcceleoParser.QUERY_START);
 		builder.append(query.getVisibility());
 		builder.append(SPACE);
 		builder.append(query.getName());
 		builder.append(AcceleoParser.OPEN_PARENTHESIS);
 		if (!query.getParameters().isEmpty()) {
 			final StringBuilder previousBuilder = builder;
 			try {
 				builder = new StringBuilder();
 				for (Variable parameter : query.getParameters()) {
 					doSwitch(parameter);
 					builder.append(AcceleoParser.COMMA);
 					builder.append(SPACE);
 				}
 				previousBuilder.append(builder.substring(0, builder.length() - 2));
 			} finally {
 				builder = previousBuilder;
 			}
 		}
 		builder.append(AcceleoParser.CLOSE_PARENTHESIS);
 		builder.append(SPACE);
 		if (query.getType() != null) {
 			builder.append(AcceleoParser.COLON);
 			builder.append(SPACE);
 			builder.append(querySerializer.serialize(query.getType().getAst()));
 			builder.append(SPACE);
 		}
 		builder.append(AcceleoParser.EQUAL);
 		builder.append(SPACE);
 		doSwitch(query.getBody());
 		builder.append(AcceleoParser.QUERY_END);

 		return DUMMY;
 	}

 	@Override
 	public Object caseTemplate(Template template) {
 		if (template.getDocumentation() != null) {
 			doSwitch(template.getDocumentation());
 			insertNewLine();
 		}
 		updateCurrentBlockHeaderStartColumn();
 		builder.append(AcceleoParser.TEMPLATE_HEADER_START);
 		builder.append(template.getVisibility());
 		builder.append(SPACE);
 		builder.append(template.getName());
 		builder.append(AcceleoParser.OPEN_PARENTHESIS);
 		if (!template.getParameters().isEmpty()) {
 			final StringBuilder previousBuilder = builder;
 			try {
 				builder = new StringBuilder();
 				for (Variable parameter : template.getParameters()) {
 					doSwitch(parameter);
 					builder.append(AcceleoParser.COMMA);
 					builder.append(SPACE);
 				}
 				previousBuilder.append(builder.substring(0, builder.length() - 2));
 			} finally {
 				builder = previousBuilder;
 			}
 		}
 		builder.append(AcceleoParser.CLOSE_PARENTHESIS);
 		if (template.getGuard() != null) {
 			builder.append(SPACE);
 			builder.append(AcceleoParser.TEMPLATE_GUARD);
 			builder.append(SPACE);
 			builder.append(AcceleoParser.OPEN_PARENTHESIS);
 			doSwitch(template.getGuard());
 			builder.append(AcceleoParser.CLOSE_PARENTHESIS);
 		}
 		if (template.getPost() != null) {
 			builder.append(SPACE);
 			builder.append(AcceleoParser.TEMPLATE_POST);
 			doSwitch(template.getPost());
 			builder.append(AcceleoParser.CLOSE_PARENTHESIS);
 		}
 		builder.append(AcceleoParser.TEMPLATE_HEADER_END);
 		doSwitch(template.getBody());
 		builder.append(AcceleoParser.TEMPLATE_END);

 		return DUMMY;
 	}

 	@Override
 	public Object caseTextStatement(TextStatement textStatement) {
 		builder.append(textStatement.getValue());
 		if (textStatement.isNewLineNeeded()) {
 			insertNewLine();
 		}
 		return DUMMY;
 	}

 	@Override
 	public Object caseVariable(Variable variable) {
 		builder.append(variable.getName());
 		builder.append(SPACE);
 		builder.append(AcceleoParser.COLON);
 		builder.append(SPACE);
 		builder.append(querySerializer.serialize(variable.getType().getAst()));

 		return DUMMY;
 	}

 	@Override
 	public Object caseNewLineStatement(NewLineStatement newLineStatement) {
 		final int lastIndexOfNewLine = builder.lastIndexOf(NEW_LINE);
 		if (!newLineStatement.isIndentationNeeded()) {
 			if (builder.substring(lastIndexOfNewLine).trim().isEmpty()) {
 				builder.setLength(lastIndexOfNewLine + NEW_LINE.length());
 			} else {
 				builder.append(NEW_LINE);
 			}
 		}
 		insertNewLine();
 		return DUMMY;
 	}

 	/**
 	 * Inserts a new line.
 	 */
 	private void insertNewLine() {
 		builder.append(NEW_LINE);
 		builder.append(currentIndentation);
 	}

 	/**
 	 * Updates the current block header start column to the current position.
 	 */
 	private void updateCurrentBlockHeaderStartColumn() {
 		final int lastNewLineIndex = builder.lastIndexOf(NEW_LINE);
 		if (lastNewLineIndex <= 0) {
 			currentBlockHeaderStartColumn = builder.length();
 		} else {
 			currentBlockHeaderStartColumn = builder.length() - (lastNewLineIndex + NEW_LINE.length());
 		}
 	}

 }
	/*******************************************************************************
	* Copyright (c) 2020 Obeo.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* Obeo - initial API and implementation
	*******************************************************************************/
	package org.eclipse.acceleo.aql.parser;

	import java.util.ArrayList;
	import java.util.List;

	import org.eclipse.acceleo.ASTNode;
	import org.eclipse.acceleo.Binding;
	import org.eclipse.acceleo.Block;
	import org.eclipse.acceleo.BlockComment;
	import org.eclipse.acceleo.Comment;
	import org.eclipse.acceleo.CommentBody;
	import org.eclipse.acceleo.Documentation;
	import org.eclipse.acceleo.Expression;
	import org.eclipse.acceleo.ExpressionStatement;
	import org.eclipse.acceleo.FileStatement;
	import org.eclipse.acceleo.ForStatement;
	import org.eclipse.acceleo.IfStatement;
	import org.eclipse.acceleo.Import;
	import org.eclipse.acceleo.LetStatement;
	import org.eclipse.acceleo.Metamodel;
	import org.eclipse.acceleo.Module;
	import org.eclipse.acceleo.ModuleDocumentation;
	import org.eclipse.acceleo.ModuleElement;
	import org.eclipse.acceleo.ModuleElementDocumentation;
	import org.eclipse.acceleo.ModuleReference;
	import org.eclipse.acceleo.NewLineStatement;
	import org.eclipse.acceleo.ProtectedArea;
	import org.eclipse.acceleo.Query;
	import org.eclipse.acceleo.Template;
	import org.eclipse.acceleo.TextStatement;
	import org.eclipse.acceleo.Variable;
	import org.eclipse.acceleo.query.parser.AstSerializer;
	import org.eclipse.acceleo.util.AcceleoSwitch;

	/**
	* Serializes {@link ASTNode}.
	*
	* @author <a href="mailto:yvan.lussaud@obeo.fr">Yvan Lussaud</a>
	*/
	public class AcceleoAstSerializer extends AcceleoSwitch<Object> {

	/**
	* The indentation space.
	*/
	private static final String INDENTATION_SPACE = " ";

	/**
	* A space.
	*/
	private static final String SPACE = " ";

	/**
	* A new line.
	*/
	private static final String NEW_LINE = "\n";

	/**
	* A dummy {@link Object} to prevent switching in super types.
	*/
	private static final Object DUMMY = new Object();

	/**
	* The {@link AstSerializer}.
	*/
	private AstSerializer querySerializer = new AstSerializer();

	/**
	* The current binding separator.
	*/
	private String bindingSeparator;

	/**
	* The resulting {@link StringBuilder}.
	*/
	private StringBuilder builder;

	/**
	* The current indentation.
	*/
	private String currentIndentation = "";

	/**
	* The current block header start column.
	*/
	private int currentBlockHeaderStartColumn;

	/**
	* Serializes the given {@link ASTNode}.
	*
	* @param node
	* the {@link ASTNode}
	* @return the serialized {@link ASTNode}
	*/
	public String serialize(ASTNode node) {
	builder = new StringBuilder();

	currentIndentation = "";
	updateCurrentBlockHeaderStartColumn();
	doSwitch(node);

	return builder.toString();
	}

	@Override
	public Object caseBinding(Binding binding) {
	builder.append(binding.getName());
	if (binding.getType() != null) {
	builder.append(" : ");
	builder.append(querySerializer.serialize(binding.getType().getAst()));
	}
	builder.append(SPACE);
	builder.append(bindingSeparator);
	builder.append(SPACE);
	doSwitch(binding.getInitExpression());

	return DUMMY;
	}

	@Override
	public Object caseBlock(Block block) {
	final String savedIndentation = currentIndentation;
	try {
	final StringBuilder blockIndentation = new StringBuilder();
	for (int i = 0; i < currentBlockHeaderStartColumn; i++) {
	blockIndentation.append(SPACE);
	}
	if (block.isInlined()) {
	currentIndentation = "";
	} else {
	if (block.getStatements().isEmpty()) {
	currentIndentation = blockIndentation.toString();
	} else {
	currentIndentation = blockIndentation.toString() + INDENTATION_SPACE;
	}
	insertNewLine();
	}
	if (!block.getStatements().isEmpty()) {
	for (int i = 0; i < block.getStatements().size() - 1; i++) {
	doSwitch(block.getStatements().get(i));
	}
	currentIndentation = blockIndentation.toString();
	doSwitch(block.getStatements().get(block.getStatements().size() - 1));
	}
	} finally {
	currentIndentation = savedIndentation;
	}

	return DUMMY;
	}

	@Override
	public Object caseBlockComment(BlockComment blockComment) {

	builder.append(AcceleoParser.BLOCK_COMMENT_START);
	doSwitch(blockComment.getBody());
	builder.append(AcceleoParser.BLOCK_COMMENT_END);

	return DUMMY;
	}

	@Override
	public Object caseComment(Comment comment) {
	builder.append(AcceleoParser.COMMENT_START);
	doSwitch(comment.getBody());
	builder.append(AcceleoParser.COMMENT_END);

	return DUMMY;
	}

	@Override
	public Object caseCommentBody(CommentBody commentBody) {
	builder.append(commentBody.getValue());

	return DUMMY;
	}

	@Override
	public Object caseDocumentation(Documentation documentation) {

	builder.append(AcceleoParser.DOCUMENTATION_START);
	doSwitch(documentation.getBody());
	builder.append(AcceleoParser.DOCUMENTATION_END);

	return DUMMY;
	}

	@Override
	public Object caseExpression(Expression expression) {
	builder.append(querySerializer.serialize(expression.getAst().getAst()));

	return DUMMY;
	}

	@Override
	public Object caseExpressionStatement(ExpressionStatement expressionStatement) {
	builder.append(AcceleoParser.EXPRESSION_STATEMENT_START);
	doSwitch(expressionStatement.getExpression());
	builder.append(AcceleoParser.EXPRESSION_STATEMENT_END);
	if (expressionStatement.isNewLineNeeded()) {
	insertNewLine();
	}
	return DUMMY;
	}

	@Override
	public Object caseFileStatement(FileStatement fileStatement) {
	updateCurrentBlockHeaderStartColumn();
	builder.append(AcceleoParser.FILE_HEADER_START);
	builder.append(AcceleoParser.OPEN_PARENTHESIS);
	doSwitch(fileStatement.getUrl());
	builder.append(AcceleoParser.COMMA);
	builder.append(SPACE);
	builder.append(fileStatement.getMode().getName());
	if (fileStatement.getCharset() != null) {
	builder.append(AcceleoParser.COMMA);
	builder.append(SPACE);
	doSwitch(fileStatement.getCharset());
	}
	builder.append(AcceleoParser.CLOSE_PARENTHESIS);
	builder.append(AcceleoParser.FILE_HEADER_END);
	doSwitch(fileStatement.getBody());
	builder.append(AcceleoParser.FILE_END);
	return DUMMY;
	};

	@Override
	public Object caseForStatement(ForStatement forStatement) {
	updateCurrentBlockHeaderStartColumn();
	builder.append(AcceleoParser.FOR_HEADER_START);
	builder.append(AcceleoParser.OPEN_PARENTHESIS);
	bindingSeparator = AcceleoParser.PIPE;
	if (forStatement.getBinding() != null) {
	doSwitch(forStatement.getBinding());
	}
	builder.append(AcceleoParser.CLOSE_PARENTHESIS);

	if (forStatement.getSeparator() != null) {
	builder.append(SPACE);
	builder.append(AcceleoParser.FOR_SEPARATOR);
	doSwitch(forStatement.getSeparator());
	builder.append(AcceleoParser.CLOSE_PARENTHESIS);
	}
	builder.append(AcceleoParser.FOR_HEADER_END);
	doSwitch(forStatement.getBody());
	builder.append(AcceleoParser.FOR_END);

	return DUMMY;
	}

	@Override
	public Object caseIfStatement(IfStatement ifStatement) {
	updateCurrentBlockHeaderStartColumn();
	builder.append(AcceleoParser.IF_HEADER_START);
	builder.append(AcceleoParser.OPEN_PARENTHESIS);
	doSwitch(ifStatement.getCondition());
	builder.append(AcceleoParser.CLOSE_PARENTHESIS);
	builder.append(AcceleoParser.IF_HEADER_END);
	if (ifStatement.getThen() != null) {
	doSwitch(ifStatement.getThen());
	}
	if (ifStatement.getElse() != null) {
	final Block elseBlock = ifStatement.getElse();
	generateElse(elseBlock);
	}
	builder.append(AcceleoParser.IF_END);

	return DUMMY;
	}

	/**
	* Serializes the given {@link Block} as a elseif or a else.
	*
	* @param block
	* the {@link Block}
	*/
	private void generateElse(Block block) {
	updateCurrentBlockHeaderStartColumn();
	if (block.getStatements().size() == 1 && block.getStatements().get(0) instanceof IfStatement) {
	final IfStatement ifStatement = (IfStatement)block.getStatements().get(0);
	builder.append(AcceleoParser.IF_ELSEIF);
	builder.append(AcceleoParser.OPEN_PARENTHESIS);
	doSwitch(ifStatement.getCondition());
	builder.append(AcceleoParser.CLOSE_PARENTHESIS);
	builder.append(AcceleoParser.IF_HEADER_END);
	doSwitch(ifStatement.getThen());
	if (ifStatement.getElse() != null) {
	final Block elseBlock = ifStatement.getElse();
	generateElse(elseBlock);
	}
	} else {
	builder.append(AcceleoParser.IF_ELSE);
	doSwitch(block);
	}
	}

	@Override
	public Object caseImport(Import imp) {
	builder.append(AcceleoParser.IMPORT_START);
	doSwitch(imp.getModule());
	builder.append(AcceleoParser.IMPORT_END);
	return DUMMY;
	}

	@Override
	public Object caseLetStatement(LetStatement letStatement) {
	updateCurrentBlockHeaderStartColumn();
	builder.append(AcceleoParser.LET_HEADER_START);
	if (!letStatement.getVariables().isEmpty()) {
	final StringBuilder previousBuilder = builder;
	try {
	builder = new StringBuilder();
	bindingSeparator = AcceleoParser.EQUAL;
	for (Binding binding : letStatement.getVariables()) {
	doSwitch(binding);
	builder.append(AcceleoParser.COMMA);
	builder.append(SPACE);
	}
	previousBuilder.append(builder.substring(0, builder.length() - 2));
	} finally {
	builder = previousBuilder;
	}
	}
	builder.append(AcceleoParser.LET_HEADER_END);
	doSwitch(letStatement.getBody());
	builder.append(AcceleoParser.LET_END);

	return DUMMY;
	};

	@Override
	public Object caseMetamodel(Metamodel metamodel) {
	builder.append(AcceleoParser.QUOTE);
	if (metamodel.getReferencedPackage() != null) {
	builder.append(metamodel.getReferencedPackage().getNsURI());
	}
	builder.append(AcceleoParser.QUOTE);

	return DUMMY;
	}

	@Override
	public Object caseModule(Module module) {
	if (module.getDocumentation() != null) {
	doSwitch(module.getDocumentation());
	insertNewLine();
	}
	builder.append(AcceleoParser.MODULE_HEADER_START);
	builder.append(module.getName());
	builder.append(AcceleoParser.OPEN_PARENTHESIS);
	if (!module.getMetamodels().isEmpty()) {
	final StringBuilder previousBuilder = builder;
	try {
	builder = new StringBuilder();
	for (Metamodel metamodel : module.getMetamodels()) {
	doSwitch(metamodel);
	builder.append(AcceleoParser.COMMA);
	builder.append(SPACE);
	}
	previousBuilder.append(builder.substring(0, builder.length() - 2));
	} finally {
	builder = previousBuilder;
	}
	}
	builder.append(AcceleoParser.CLOSE_PARENTHESIS);
	if (module.getExtends() != null) {
	builder.append(SPACE);
	builder.append(AcceleoParser.EXTENDS);
	doSwitch(module.getExtends());
	}
	builder.append(AcceleoParser.MODULE_HEADER_END);

	if (!module.getImports().isEmpty()) {
	insertNewLine();
	for (Import importedModule : module.getImports()) {
	insertNewLine();
	doSwitch(importedModule);
	}
	}

	final List<ModuleElement> moduleElements = getSignificantModuleElements(module);
	final int numberOfElements = moduleElements.size();
	int currentElementIndex = 0;
	if (!moduleElements.isEmpty()) {
	insertNewLine();
	for (ModuleElement moduleElement : moduleElements) {
	insertNewLine();
	doSwitch(moduleElement);
	currentElementIndex++;
	if ((currentElementIndex < numberOfElements) && (moduleElement instanceof Template
	\|\| moduleElement instanceof Query)) {
	insertNewLine();
	}
	}
	}

	return DUMMY;
	}

	private List<ModuleElement> getSignificantModuleElements(Module module) {
	final List<ModuleElement> res = new ArrayList<ModuleElement>();

	for (ModuleElement moduleElement : module.getModuleElements()) {
	if (!(moduleElement instanceof Documentation) \|\| ((Documentation)moduleElement)
	.getDocumentedElement() == null) {
	res.add(moduleElement);
	}
	}

	return res;
	}

	@Override
	public Object caseModuleDocumentation(ModuleDocumentation moduleDocumentation) {
	builder.append(AcceleoParser.DOCUMENTATION_START);
	doSwitch(moduleDocumentation.getBody());
	builder.append(AcceleoParser.DOCUMENTATION_END);
	return DUMMY;
	}

	@Override
	public Object caseModuleElementDocumentation(ModuleElementDocumentation moduleElementDocumentation) {
	builder.append(AcceleoParser.DOCUMENTATION_START);
	doSwitch(moduleElementDocumentation.getBody());
	builder.append(AcceleoParser.DOCUMENTATION_END);
	return DUMMY;
	}

	@Override
	public Object caseModuleReference(ModuleReference moduleReference) {
	builder.append(moduleReference.getQualifiedName());
	return DUMMY;
	}

	@Override
	public Object caseProtectedArea(ProtectedArea protectedArea) {
	updateCurrentBlockHeaderStartColumn();
	builder.append(AcceleoParser.PROTECTED_AREA_HEADER_START);
	builder.append(AcceleoParser.OPEN_PARENTHESIS);
	doSwitch(protectedArea.getId());
	builder.append(AcceleoParser.CLOSE_PARENTHESIS);
	builder.append(AcceleoParser.PROTECTED_AREA_HEADER_END);
	doSwitch(protectedArea.getBody());
	builder.append(AcceleoParser.PROTECTED_AREA_END);

	return DUMMY;
	}

	@Override
	public Object caseQuery(Query query) {
	if (query.getDocumentation() != null) {
	doSwitch(query.getDocumentation());
	insertNewLine();
	}
	builder.append(AcceleoParser.QUERY_START);
	builder.append(query.getVisibility());
	builder.append(SPACE);
	builder.append(query.getName());
	builder.append(AcceleoParser.OPEN_PARENTHESIS);
	if (!query.getParameters().isEmpty()) {
	final StringBuilder previousBuilder = builder;
	try {
	builder = new StringBuilder();
	for (Variable parameter : query.getParameters()) {
	doSwitch(parameter);
	builder.append(AcceleoParser.COMMA);
	builder.append(SPACE);
	}
	previousBuilder.append(builder.substring(0, builder.length() - 2));
	} finally {
	builder = previousBuilder;
	}
	}
	builder.append(AcceleoParser.CLOSE_PARENTHESIS);
	builder.append(SPACE);
	if (query.getType() != null) {
	builder.append(AcceleoParser.COLON);
	builder.append(SPACE);
	builder.append(querySerializer.serialize(query.getType().getAst()));
	builder.append(SPACE);
	}
	builder.append(AcceleoParser.EQUAL);
	builder.append(SPACE);
	doSwitch(query.getBody());
	builder.append(AcceleoParser.QUERY_END);

	return DUMMY;
	}

	@Override
	public Object caseTemplate(Template template) {
	if (template.getDocumentation() != null) {
	doSwitch(template.getDocumentation());
	insertNewLine();
	}
	updateCurrentBlockHeaderStartColumn();
	builder.append(AcceleoParser.TEMPLATE_HEADER_START);
	builder.append(template.getVisibility());
	builder.append(SPACE);
	builder.append(template.getName());
	builder.append(AcceleoParser.OPEN_PARENTHESIS);
	if (!template.getParameters().isEmpty()) {
	final StringBuilder previousBuilder = builder;
	try {
	builder = new StringBuilder();
	for (Variable parameter : template.getParameters()) {
	doSwitch(parameter);
	builder.append(AcceleoParser.COMMA);
	builder.append(SPACE);
	}
	previousBuilder.append(builder.substring(0, builder.length() - 2));
	} finally {
	builder = previousBuilder;
	}
	}
	builder.append(AcceleoParser.CLOSE_PARENTHESIS);
	if (template.getGuard() != null) {
	builder.append(SPACE);
	builder.append(AcceleoParser.TEMPLATE_GUARD);
	builder.append(SPACE);
	builder.append(AcceleoParser.OPEN_PARENTHESIS);
	doSwitch(template.getGuard());
	builder.append(AcceleoParser.CLOSE_PARENTHESIS);
	}
	if (template.getPost() != null) {
	builder.append(SPACE);
	builder.append(AcceleoParser.TEMPLATE_POST);
	doSwitch(template.getPost());
	builder.append(AcceleoParser.CLOSE_PARENTHESIS);
	}
	builder.append(AcceleoParser.TEMPLATE_HEADER_END);
	doSwitch(template.getBody());
	builder.append(AcceleoParser.TEMPLATE_END);

	return DUMMY;
	}

	@Override
	public Object caseTextStatement(TextStatement textStatement) {
	builder.append(textStatement.getValue());
	if (textStatement.isNewLineNeeded()) {
	insertNewLine();
	}
	return DUMMY;
	}

	@Override
	public Object caseVariable(Variable variable) {
	builder.append(variable.getName());
	builder.append(SPACE);
	builder.append(AcceleoParser.COLON);
	builder.append(SPACE);
	builder.append(querySerializer.serialize(variable.getType().getAst()));

	return DUMMY;
	}

	@Override
	public Object caseNewLineStatement(NewLineStatement newLineStatement) {
	final int lastIndexOfNewLine = builder.lastIndexOf(NEW_LINE);
	if (!newLineStatement.isIndentationNeeded()) {
	if (builder.substring(lastIndexOfNewLine).trim().isEmpty()) {
	builder.setLength(lastIndexOfNewLine + NEW_LINE.length());
	} else {
	builder.append(NEW_LINE);
	}
	}
	insertNewLine();
	return DUMMY;
	}

	/**
	* Inserts a new line.
	*/
	private void insertNewLine() {
	builder.append(NEW_LINE);
	builder.append(currentIndentation);
	}

	/**
	* Updates the current block header start column to the current position.
	*/
	private void updateCurrentBlockHeaderStartColumn() {
	final int lastNewLineIndex = builder.lastIndexOf(NEW_LINE);
	if (lastNewLineIndex <= 0) {
	currentBlockHeaderStartColumn = builder.length();
	} else {
	currentBlockHeaderStartColumn = builder.length() - (lastNewLineIndex + NEW_LINE.length());
	}
	}

	}