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AcceleoAstSerializer.java
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AcceleoAstSerializer.java
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/*******************************************************************************
* Copyright (c) 2020, 2024 Obeo.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v2.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v20.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.AcceleoASTNode;
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.ast.Conditional;
import org.eclipse.acceleo.query.ast.Let;
import org.eclipse.acceleo.query.parser.AstBuilder;
import org.eclipse.acceleo.query.parser.AstSerializer;
import org.eclipse.acceleo.util.AcceleoSwitch;
/**
* Serializes {@link AcceleoASTNode}.
*
* @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 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;
/**
* The new line {@link String}.
*/
private final String newLine;
public AcceleoAstSerializer(String newLine) {
this.newLine = newLine;
}
/**
* Serializes the given {@link AcceleoASTNode}.
*
* @param node
* the {@link AcceleoASTNode}
* @return the serialized {@link AcceleoASTNode}
*/
public String serialize(AcceleoASTNode node) {
builder = new StringBuilder();
currentIndentation = "";
updateCurrentBlockHeaderStartColumn();
doSwitch(node);
return builder.toString();
}
@Override
public Object caseBinding(Binding binding) {
final String bindingName = AstBuilder.protectWithUnderscore(binding.getName());
builder.append(bindingName);
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();
if (block.isInlined()) {
currentIndentation = "";
} else {
for (int i = 0; i < currentBlockHeaderStartColumn; i++) {
blockIndentation.append(SPACE);
}
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().replaceAll("(\\r\\n)|\\n", newLine));
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);
if (expressionStatement.getExpression() != null && (expressionStatement.getExpression()
.getAql() instanceof Conditional || expressionStatement.getExpression()
.getAql() instanceof Let)) {
builder.append(SPACE);
}
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);
if (protectedArea.getStartTagPrefix() != null) {
builder.append(SPACE);
builder.append(AcceleoParser.PROTECTED_AREA_START_TAG_PREFIX);
doSwitch(protectedArea.getStartTagPrefix());
builder.append(AcceleoParser.CLOSE_PARENTHESIS);
}
if (protectedArea.getEndTagPrefix() != null) {
builder.append(SPACE);
builder.append(AcceleoParser.PROTECTED_AREA_END_TAG_PREFIX);
doSwitch(protectedArea.getEndTagPrefix());
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().replaceAll("(\\r\\n)|\\n", newLine));
if (textStatement.isNewLineNeeded()) {
insertNewLine();
}
return DUMMY;
}
@Override
public Object caseVariable(Variable variable) {
final String variableName = AstBuilder.protectWithUnderscore(variable.getName());
builder.append(variableName);
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(newLine);
if (!newLineStatement.isIndentationNeeded()) {
if (builder.substring(lastIndexOfNewLine).trim().isEmpty()) {
builder.setLength(lastIndexOfNewLine + newLine.length());
} else {
builder.append(newLine);
}
}
insertNewLine();
return DUMMY;
}
/**
* Inserts a new line.
*/
private void insertNewLine() {
builder.append(newLine);
builder.append(currentIndentation);
}
/**
* Updates the current block header start column to the current position.
*/
private void updateCurrentBlockHeaderStartColumn() {
final int lastNewLineIndex = builder.lastIndexOf(newLine);
if (lastNewLineIndex <= 0) {
currentBlockHeaderStartColumn = builder.length();
} else {
currentBlockHeaderStartColumn = builder.length() - (lastNewLineIndex + newLine.length());
}
}
}