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DocumentSourceAppender.java
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DocumentSourceAppender.java
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/*******************************************************************************
* Copyright (c) 2013 itemis AG (http://www.itemis.eu) and others.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package org.eclipse.xtext.xbase.ui.document;
import java.util.List;
import java.util.regex.Pattern;
import org.apache.log4j.Logger;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.xtext.common.types.JvmArrayType;
import org.eclipse.xtext.common.types.JvmDeclaredType;
import org.eclipse.xtext.common.types.JvmPrimitiveType;
import org.eclipse.xtext.common.types.JvmType;
import org.eclipse.xtext.common.types.JvmTypeParameter;
import org.eclipse.xtext.common.types.JvmVoid;
import org.eclipse.xtext.formatting.IWhitespaceInformationProvider;
import org.eclipse.xtext.resource.XtextResource;
import org.eclipse.xtext.ui.editor.model.IXtextDocument;
import org.eclipse.xtext.util.ReplaceRegion;
import org.eclipse.xtext.xbase.compiler.ISourceAppender;
import org.eclipse.xtext.xbase.imports.RewritableImportSection;
import org.eclipse.xtext.xbase.lib.IterableExtensions;
import org.eclipse.xtext.xbase.typesystem.references.LightweightTypeReference;
import org.eclipse.xtext.xbase.typesystem.references.LightweightTypeReferenceSerializer;
import org.eclipse.xtext.xbase.ui.contentassist.WhitespaceHelper;
import com.google.inject.Inject;
import com.google.inject.Provider;
/**
* @author Jan Koehnlein - Initial contribution and API
*/
public class DocumentSourceAppender implements ISourceAppender {
public abstract static class Factory<T extends DocumentSourceAppender> {
private static final Logger LOG = Logger.getLogger(Factory.class);
@Inject
private IWhitespaceInformationProvider whitespaceInformationProvider;
@Inject
private Provider<WhitespaceHelper> whitespaceHelperProvider;
@Inject
private RewritableImportSection.Factory rewritableImportSectionFactory;
protected abstract T newInstance(IXtextDocument document, RewritableImportSection rewritableImportSection, WhitespaceHelper whitespaceHelper,
String indentString, String lineSeparator, int baseIndentationLevel, boolean isJava);
public T create(IXtextDocument document, XtextResource resource, int offset, int length) {
return create(document, resource, offset, length, new OptionalParameters());
}
public T create(IXtextDocument document, XtextResource resource, int offset, int length, OptionalParameters params) {
int baseIndentationLevel = (params.baseIndentationLevel != -1) ? params.baseIndentationLevel : getIndentationLevelAtOffset(offset, document, resource);
RewritableImportSection importSection = (params.importSection != null) ? params.importSection : rewritableImportSectionFactory.parse(resource);
String indentString = getIndentString(resource);
String lineSeparator = whitespaceInformationProvider.getLineSeparatorInformation(resource.getURI()).getLineSeparator();
WhitespaceHelper whitespaceHelper = whitespaceHelperProvider.get();
whitespaceHelper.initialize(document, offset, length, params.ensureEmptyLinesAround);
T appendable = newInstance(document, importSection, whitespaceHelper,
indentString, lineSeparator, baseIndentationLevel, params.isJava);
return appendable;
}
protected String getIndentString(XtextResource resource) {
return whitespaceInformationProvider.getIndentationInformation(resource.getURI()).getIndentString();
}
public int getIndentationLevelAtOffset(int offset, IDocument document, XtextResource resource) {
try {
if (offset <= 0)
return 0;
int currentOffset = offset - 1;
char currentChr = document.getChar(currentOffset);
int indentationOffset = 0;
if(currentChr == '\n' || currentChr == '\r') {
-- currentOffset;
if(currentOffset < 0)
return 0;
currentChr = document.getChar(currentOffset);
}
while (currentChr != '\n' && currentChr != '\r' && currentOffset > 0) {
if (Character.isWhitespace(currentChr))
++indentationOffset;
else
indentationOffset = 0;
--currentOffset;
currentChr = document.getChar(currentOffset);
}
return indentationOffset / getIndentString(resource).length();
} catch (BadLocationException e) {
LOG.error("Error calculating indentation at offset", e);
}
return 0;
}
public static class OptionalParameters {
public boolean isJava;
public boolean ensureEmptyLinesAround;
public int baseIndentationLevel = -1;
public RewritableImportSection importSection;
}
}
private int baseIndentLevel = 0;
private String indentString = " ";
private String lineSeparator = "\n";
private LightweightTypeReferenceSerializer lightweightTypeReferenceSerializer;
private boolean isJava;
private StringBuilder builder = new StringBuilder(8 * 1024);
private int currentIndentLevel = 0;
private final IXtextDocument document;
private final WhitespaceHelper whitespaceHelper;
private final RewritableImportSection importSection;
public DocumentSourceAppender(IXtextDocument document, RewritableImportSection importSection, WhitespaceHelper whitespaceHelper,
String indentString, String lineSeparator, int baseIndentationLevel, boolean isJava) {
this.baseIndentLevel = baseIndentationLevel;
this.indentString = indentString;
this.currentIndentLevel = baseIndentationLevel;
this.lineSeparator = lineSeparator;
this.lightweightTypeReferenceSerializer = createLightweightTypeReferenceSerializer();
this.isJava = isJava;
this.document = document;
this.importSection = importSection;
this.whitespaceHelper = whitespaceHelper;
}
protected LightweightTypeReferenceSerializer createLightweightTypeReferenceSerializer() {
return new LightweightTypeReferenceSerializer(this);
}
public int getBaseIndentLevel() {
return baseIndentLevel;
}
protected int getCurrentIndentLevel() {
return currentIndentLevel;
}
protected CharSequence getIndentationString() {
StringBuilder sb = new StringBuilder(10);
sb.append(lineSeparator);
for (int i = 0; i < currentIndentLevel; i++) {
sb.append(indentString);
}
return sb.toString();
}
protected String getLineSeparator() {
return lineSeparator;
}
@Override
public boolean isJava() {
return isJava;
}
public IXtextDocument getDocument() {
return document;
}
public RewritableImportSection getImportSection() {
return importSection;
}
@Override
public ISourceAppender append(JvmType type) {
appendType(type, builder);
return this;
}
public void appendType(final /* @NonNull */ JvmType type, /* @NonNull */ StringBuilder builder) {
if (type instanceof JvmPrimitiveType || type instanceof JvmVoid || type instanceof JvmTypeParameter) {
builder.append(type.getQualifiedName(getInnerTypeSeparator()));
} else if (type instanceof JvmArrayType) {
appendType(((JvmArrayType) type).getComponentType(), builder);
builder.append("[]");
} else {
final String qualifiedName = type.getQualifiedName(getInnerTypeSeparator());
final String simpleName = type.getSimpleName();
JvmDeclaredType importedType = getImportedType(type);
if (importedType == type) {
builder.append(simpleName);
} else if (importedType == null) {
importSection.addImport((JvmDeclaredType) type);
builder.append(simpleName);
} else {
builder.append(qualifiedName);
}
}
}
protected JvmDeclaredType getImportedType(JvmType type) {
List<JvmDeclaredType> importedTypes = importSection.getImportedTypes(type.getSimpleName());
if (importedTypes == null) {
return null;
}
for (JvmDeclaredType importedType : importedTypes) {
if (importedType == type) {
return importedType;
}
}
return IterableExtensions.lastOrNull(importedTypes);
}
protected char getInnerTypeSeparator() {
return '.';
}
@Override
public ISourceAppender append(LightweightTypeReference typeRef) {
typeRef.accept(lightweightTypeReferenceSerializer);
return this;
}
public void append(CharSequence content, int indentationDelta) {
if (indentationDelta < 0)
append(content.toString().replaceAll(
Pattern.quote(getLineSeparator() + indentString(-indentationDelta)), getLineSeparator()));
else if (indentationDelta > 0)
append(content.toString().replaceAll(Pattern.quote(getLineSeparator()),
getLineSeparator() + indentString(indentationDelta)));
else
append(content);
}
protected String indentString(int indentLevel) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < indentLevel; i++) {
sb.append(indentString);
}
return sb.toString();
}
@Override
public ISourceAppender append(CharSequence string) {
String replaced = string.toString().replace(lineSeparator, getIndentationString());
builder.append(replaced);
return this;
}
@Override
public ISourceAppender newLine() {
builder.append(getIndentationString());
return this;
}
@Override
public ISourceAppender increaseIndentation() {
currentIndentLevel++;
return this;
}
@Override
public ISourceAppender decreaseIndentation() {
if (currentIndentLevel == 0)
throw new IllegalStateException("Can't reduce indentation level. It's already zero.");
currentIndentLevel--;
return this;
}
public int length() {
return builder.length();
}
@Override
/* @NonNull */
public String toString() {
return builder.toString();
}
/* @NonNull */
public String getCode() {
StringBuilder builder = new StringBuilder();
if (whitespaceHelper.getPrefix() != null)
builder.append(whitespaceHelper.getPrefix().replace(getLineSeparator(), getIndentationString()));
builder.append(toString());
if (whitespaceHelper.getSuffix() != null)
builder.append(whitespaceHelper.getSuffix().replace(getLineSeparator(), getIndentationString()));
return builder.toString();
}
public ReplaceRegion getChange() {
return new ReplaceRegion(whitespaceHelper.getTotalOffset(), whitespaceHelper.getTotalLength(), getCode());
}
public ReplaceRegion getChange(int offset, int length) {
int actualOffset = Math.min(whitespaceHelper.getTotalOffset(), offset);
int endOffset = Math.max(whitespaceHelper.getTotalOffset() + whitespaceHelper.getTotalLength(), offset + length);
return new ReplaceRegion(actualOffset, endOffset - actualOffset, getCode());
}
public int getTotalOffset() {
return whitespaceHelper.getTotalOffset();
}
public int getTotalLength() {
return whitespaceHelper.getTotalLength();
}
}