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org.eclipse.jdt.internal.core.dom.rewrite.ASTRewriteFormatter Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2000, 2016 IBM Corporation and others.
* 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jdt.internal.core.dom.rewrite;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.ToolFactory;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.Annotation;
import org.eclipse.jdt.core.dom.Block;
import org.eclipse.jdt.core.dom.BodyDeclaration;
import org.eclipse.jdt.core.dom.Expression;
import org.eclipse.jdt.core.dom.Statement;
import org.eclipse.jdt.core.formatter.CodeFormatter;
import org.eclipse.jdt.core.formatter.DefaultCodeFormatterConstants;
import org.eclipse.jdt.core.formatter.IndentManipulation;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.BadPositionCategoryException;
import org.eclipse.jface.text.DefaultPositionUpdater;
import org.eclipse.jface.text.Document;
import org.eclipse.jface.text.Position;
import org.eclipse.text.edits.DeleteEdit;
import org.eclipse.text.edits.InsertEdit;
import org.eclipse.text.edits.MultiTextEdit;
import org.eclipse.text.edits.ReplaceEdit;
import org.eclipse.text.edits.TextEdit;
@SuppressWarnings({"rawtypes", "unchecked"})
public final class ASTRewriteFormatter {
public static class NodeMarker extends Position {
public Object data;
}
private class ExtendedFlattener extends ASTRewriteFlattener {
private ArrayList positions;
public ExtendedFlattener(RewriteEventStore store) {
super(store);
this.positions= new ArrayList();
}
/* (non-Javadoc)
* @see org.eclipse.jdt.core.dom.ASTVisitor#preVisit(ASTNode)
*/
public void preVisit(ASTNode node) {
Object trackData= getEventStore().getTrackedNodeData(node);
if (trackData != null) {
addMarker(trackData, this.result.length(), 0);
}
Object placeholderData= getPlaceholders().getPlaceholderData(node);
if (placeholderData != null) {
addMarker(placeholderData, this.result.length(), 0);
}
}
/* (non-Javadoc)
* @see org.eclipse.jdt.core.dom.ASTVisitor#postVisit(ASTNode)
*/
public void postVisit(ASTNode node) {
Object placeholderData= getPlaceholders().getPlaceholderData(node);
if (placeholderData != null) {
fixupLength(placeholderData, this.result.length());
}
Object trackData= getEventStore().getTrackedNodeData(node);
if (trackData != null) {
fixupLength(trackData, this.result.length());
}
}
/* (non-Javadoc)
* @see org.eclipse.jdt.internal.corext.dom.ASTRewriteFlattener#visit(org.eclipse.jdt.core.dom.Block)
*/
public boolean visit(Block node) {
if (getPlaceholders().isCollapsed(node)) {
visitList(node, Block.STATEMENTS_PROPERTY, null);
return false;
}
return super.visit(node);
}
private NodeMarker addMarker(Object annotation, int startOffset, int length) {
NodeMarker marker= new NodeMarker();
marker.offset= startOffset;
marker.length= length;
marker.data= annotation;
this.positions.add(marker);
return marker;
}
private void fixupLength(Object data, int endOffset) {
for (int i= this.positions.size()-1; i >= 0 ; i--) {
NodeMarker marker= (NodeMarker) this.positions.get(i);
if (marker.data == data) {
marker.length= endOffset - marker.offset;
return;
}
}
}
public NodeMarker[] getMarkers() {
return (NodeMarker[]) this.positions.toArray(new NodeMarker[this.positions.size()]);
}
}
private final String lineDelimiter;
private final int tabWidth;
private final int indentWidth;
private final NodeInfoStore placeholders;
private final RewriteEventStore eventStore;
private final Map options;
public ASTRewriteFormatter(NodeInfoStore placeholders, RewriteEventStore eventStore, Map options, String lineDelimiter) {
this.placeholders= placeholders;
this.eventStore= eventStore;
this.options= options == null ? JavaCore.getOptions() : (Map) new HashMap(options);
this.options.put(
DefaultCodeFormatterConstants.FORMATTER_ALIGNMENT_FOR_RESOURCES_IN_TRY,
DefaultCodeFormatterConstants.createAlignmentValue(true, DefaultCodeFormatterConstants.WRAP_NEXT_PER_LINE, DefaultCodeFormatterConstants.INDENT_DEFAULT));
this.lineDelimiter= lineDelimiter;
this.tabWidth= IndentManipulation.getTabWidth(options);
this.indentWidth= IndentManipulation.getIndentWidth(options);
}
public NodeInfoStore getPlaceholders() {
return this.placeholders;
}
public RewriteEventStore getEventStore() {
return this.eventStore;
}
public int getTabWidth() {
return this.tabWidth;
}
public int getIndentWidth() {
return this.indentWidth;
}
public String getLineDelimiter() {
return this.lineDelimiter;
}
/**
* Returns the string accumulated in the visit formatted using the default formatter.
* Updates the existing node's positions.
*
* @param node The node to flatten.
* @param initialIndentationLevel The initial indentation level.
* @param resultingMarkers Resulting the updated NodeMarkers.
* @return Returns the serialized and formatted code.
*/
public String getFormattedResult(ASTNode node, int initialIndentationLevel, Collection resultingMarkers) {
ExtendedFlattener flattener= new ExtendedFlattener(this.eventStore);
node.accept(flattener);
NodeMarker[] markers= flattener.getMarkers();
for (int i= 0; i < markers.length; i++) {
resultingMarkers.add(markers[i]); // add to result
}
String unformatted= flattener.getResult();
TextEdit edit= formatNode(node, unformatted, initialIndentationLevel);
if (edit == null) {
if (initialIndentationLevel > 0) {
// at least correct the indent
String indentString = createIndentString(initialIndentationLevel);
ReplaceEdit[] edits = IndentManipulation.getChangeIndentEdits(unformatted, 0, this.tabWidth, this.indentWidth, indentString);
edit= new MultiTextEdit();
edit.addChild(new InsertEdit(0, indentString));
edit.addChildren(edits);
} else {
return unformatted;
}
}
return evaluateFormatterEdit(unformatted, edit, markers);
}
public String createIndentString(int indentationUnits) {
return ToolFactory.createCodeFormatter(this.options).createIndentationString(indentationUnits);
}
public String getIndentString(String currentLine) {
return IndentManipulation.extractIndentString(currentLine, this.tabWidth, this.indentWidth);
}
public String changeIndent(String code, int codeIndentLevel, String newIndent) {
return IndentManipulation.changeIndent(code, codeIndentLevel, this.tabWidth, this.indentWidth, newIndent, this.lineDelimiter);
}
public int computeIndentUnits(String line) {
return IndentManipulation.measureIndentUnits(line, this.tabWidth, this.indentWidth);
}
/**
* Evaluates the edit on the given string.
* @param string The string to format
* @param edit The edit resulted from the code formatter
* @param positions Positions to update or null.
* @return The formatted string
* @throws IllegalArgumentException If the positions are not inside the string, a
* IllegalArgumentException is thrown.
*/
public static String evaluateFormatterEdit(String string, TextEdit edit, Position[] positions) {
try {
Document doc= createDocument(string, positions);
edit.apply(doc, 0);
if (positions != null) {
for (int i= 0; i < positions.length; i++) {
Assert.isTrue(!positions[i].isDeleted, "Position got deleted"); //$NON-NLS-1$
}
}
return doc.get();
} catch (BadLocationException e) {
//JavaPlugin.log(e); // bug in the formatter
Assert.isTrue(false, "Fromatter created edits with wrong positions: " + e.getMessage()); //$NON-NLS-1$
}
return null;
}
public TextEdit formatString(int kind, String string, int offset, int length, int indentationLevel) {
return ToolFactory.createCodeFormatter(this.options).format(kind, string, offset, length, indentationLevel, this.lineDelimiter);
}
/**
* Creates edits that describe how to format the given string. Returns null if the code could not be formatted for the given kind.
* @param node Node describing the type of the string
* @param str The unformatted string
* @param indentationLevel
* @return Returns the edit representing the result of the formatter
* @throws IllegalArgumentException If the offset and length are not inside the string, a
* IllegalArgumentException is thrown.
*/
private TextEdit formatNode(ASTNode node, String str, int indentationLevel) {
int code;
String prefix= ""; //$NON-NLS-1$
String suffix= ""; //$NON-NLS-1$
if (node instanceof Statement) {
code= CodeFormatter.K_STATEMENTS;
if (node.getNodeType() == ASTNode.SWITCH_CASE) {
prefix= "switch(1) {"; //$NON-NLS-1$
suffix= "}"; //$NON-NLS-1$
code= CodeFormatter.K_STATEMENTS;
}
} else if (node instanceof Expression && node.getNodeType() != ASTNode.VARIABLE_DECLARATION_EXPRESSION) {
if (node instanceof Annotation) {
suffix= "\nclass A {}"; //$NON-NLS-1$
code= CodeFormatter.K_COMPILATION_UNIT;
} else {
code= CodeFormatter.K_EXPRESSION;
}
} else if (node instanceof BodyDeclaration) {
code= CodeFormatter.K_CLASS_BODY_DECLARATIONS;
} else {
switch (node.getNodeType()) {
case ASTNode.ARRAY_TYPE:
case ASTNode.PARAMETERIZED_TYPE:
case ASTNode.PRIMITIVE_TYPE:
case ASTNode.QUALIFIED_TYPE:
case ASTNode.SIMPLE_TYPE:
prefix= "void m(final "; //$NON-NLS-1$
suffix= " x);"; //$NON-NLS-1$
code= CodeFormatter.K_CLASS_BODY_DECLARATIONS;
break;
case ASTNode.WILDCARD_TYPE:
prefix= "A<"; //$NON-NLS-1$
suffix= "> x;"; //$NON-NLS-1$
code= CodeFormatter.K_CLASS_BODY_DECLARATIONS;
break;
case ASTNode.COMPILATION_UNIT:
code= CodeFormatter.K_COMPILATION_UNIT;
break;
case ASTNode.VARIABLE_DECLARATION_EXPRESSION:
suffix= ";"; //$NON-NLS-1$
code= CodeFormatter.K_STATEMENTS;
break;
case ASTNode.SINGLE_VARIABLE_DECLARATION:
prefix= "void m("; //$NON-NLS-1$
suffix= ");"; //$NON-NLS-1$
code= CodeFormatter.K_CLASS_BODY_DECLARATIONS;
break;
case ASTNode.VARIABLE_DECLARATION_FRAGMENT:
prefix= "A "; //$NON-NLS-1$
suffix= ";"; //$NON-NLS-1$
code= CodeFormatter.K_STATEMENTS;
break;
case ASTNode.PACKAGE_DECLARATION:
case ASTNode.IMPORT_DECLARATION:
suffix= "\nclass A {}"; //$NON-NLS-1$
code= CodeFormatter.K_COMPILATION_UNIT;
break;
case ASTNode.JAVADOC:
suffix= "\nclass A {}"; //$NON-NLS-1$
code= CodeFormatter.K_COMPILATION_UNIT;
break;
case ASTNode.CATCH_CLAUSE:
prefix= "try {}"; //$NON-NLS-1$
code= CodeFormatter.K_STATEMENTS;
break;
case ASTNode.ANONYMOUS_CLASS_DECLARATION:
prefix= "new A()"; //$NON-NLS-1$
suffix= ";"; //$NON-NLS-1$
code= CodeFormatter.K_STATEMENTS;
break;
case ASTNode.MEMBER_VALUE_PAIR:
prefix= "@Author("; //$NON-NLS-1$
suffix= ") class x {}"; //$NON-NLS-1$
code= CodeFormatter.K_COMPILATION_UNIT;
break;
case ASTNode.MODIFIER:
suffix= " class x {}"; //$NON-NLS-1$
code= CodeFormatter.K_COMPILATION_UNIT;
break;
case ASTNode.TYPE_PARAMETER:
prefix= "class X<"; //$NON-NLS-1$
suffix= "> {}"; //$NON-NLS-1$
code= CodeFormatter.K_COMPILATION_UNIT;
break;
case ASTNode.MEMBER_REF:
case ASTNode.METHOD_REF:
case ASTNode.METHOD_REF_PARAMETER:
case ASTNode.TAG_ELEMENT:
case ASTNode.TEXT_ELEMENT:
// javadoc formatting disabled due to bug 93644
return null;
// wiat for bug 93644
// case ASTNode.MEMBER_REF:
// case ASTNode.METHOD_REF:
// prefix= "/**\n * @see ";
// suffix= "\n*/";
// code= CodeFormatter.K_JAVA_DOC;
// break;
// case ASTNode.METHOD_REF_PARAMETER:
// prefix= "/**\n * @see A#foo(";
// suffix= ")\n*/";
// code= CodeFormatter.K_JAVA_DOC;
// break;
// case ASTNode.TAG_ELEMENT:
// case ASTNode.TEXT_ELEMENT:
// prefix= "/**\n * ";
// suffix= "\n*/";
// code= CodeFormatter.K_JAVA_DOC;
// break;
default:
//Assert.isTrue(false, "Node type not covered: " + node.getClass().getName());
return null;
}
}
String concatStr= prefix + str + suffix;
TextEdit edit= formatString(code, concatStr, prefix.length(), str.length(), indentationLevel);
if (prefix.length() > 0) {
edit= shifEdit(edit, prefix.length());
}
return edit;
}
private static TextEdit shifEdit(TextEdit oldEdit, int diff) {
TextEdit newEdit;
if (oldEdit instanceof ReplaceEdit) {
ReplaceEdit edit= (ReplaceEdit) oldEdit;
newEdit= new ReplaceEdit(edit.getOffset() - diff, edit.getLength(), edit.getText());
} else if (oldEdit instanceof InsertEdit) {
InsertEdit edit= (InsertEdit) oldEdit;
newEdit= new InsertEdit(edit.getOffset() - diff, edit.getText());
} else if (oldEdit instanceof DeleteEdit) {
DeleteEdit edit= (DeleteEdit) oldEdit;
newEdit= new DeleteEdit(edit.getOffset() - diff, edit.getLength());
} else if (oldEdit instanceof MultiTextEdit) {
newEdit= new MultiTextEdit();
} else {
return null; // not supported
}
TextEdit[] children= oldEdit.getChildren();
for (int i= 0; i < children.length; i++) {
TextEdit shifted= shifEdit(children[i], diff);
if (shifted != null) {
newEdit.addChild(shifted);
}
}
return newEdit;
}
private static Document createDocument(String string, Position[] positions) throws IllegalArgumentException {
Document doc= new Document(string);
try {
if (positions != null) {
final String POS_CATEGORY= "myCategory"; //$NON-NLS-1$
doc.addPositionCategory(POS_CATEGORY);
doc.addPositionUpdater(new DefaultPositionUpdater(POS_CATEGORY) {
protected boolean notDeleted() {
int start= this.fOffset;
int end= start + this.fLength;
if (start < this.fPosition.offset && (this.fPosition.offset + this.fPosition.length < end)) {
this.fPosition.offset= end; // deleted positions: set to end of remove
return false;
}
return true;
}
});
for (int i= 0; i < positions.length; i++) {
try {
doc.addPosition(POS_CATEGORY, positions[i]);
} catch (BadLocationException e) {
throw new IllegalArgumentException("Position outside of string. offset: " + positions[i].offset + ", length: " + positions[i].length + ", string size: " + string.length()); //$NON-NLS-1$//$NON-NLS-2$//$NON-NLS-3$
}
}
}
} catch (BadPositionCategoryException cannotHappen) {
// can not happen: category is correctly set up
}
return doc;
}
public static interface Prefix {
String getPrefix(int indent);
}
public static interface BlockContext {
String[] getPrefixAndSuffix(int indent, ASTNode node, RewriteEventStore events);
}
public static class ConstPrefix implements Prefix {
private String prefix;
public ConstPrefix(String prefix) {
this.prefix= prefix;
}
public String getPrefix(int indent) {
return this.prefix;
}
}
private class FormattingPrefix implements Prefix {
private int kind;
private String string;
private int start;
private int length;
public FormattingPrefix(String string, String sub, int kind) {
this.start= string.indexOf(sub);
this.length= sub.length();
this.string= string;
this.kind= kind;
}
public String getPrefix(int indent) {
Position pos= new Position(this.start, this.length);
String str= this.string;
TextEdit res= formatString(this.kind, str, 0, str.length(), indent);
if (res != null) {
str= evaluateFormatterEdit(str, res, new Position[] { pos });
}
return str.substring(pos.offset + 1, pos.offset + pos.length - 1);
}
}
private class BlockFormattingPrefix implements BlockContext {
private String prefix;
private int start;
public BlockFormattingPrefix(String prefix, int start) {
this.start= start;
this.prefix= prefix;
}
public String[] getPrefixAndSuffix(int indent, ASTNode node, RewriteEventStore events) {
String nodeString= ASTRewriteFlattener.asString(node, events);
String str= this.prefix + nodeString;
Position pos= new Position(this.start, this.prefix.length() + 1 - this.start);
TextEdit res= formatString(CodeFormatter.K_STATEMENTS, str, 0, str.length(), indent);
if (res != null) {
str= evaluateFormatterEdit(str, res, new Position[] { pos });
}
return new String[] { str.substring(pos.offset + 1, pos.offset + pos.length - 1), ""}; //$NON-NLS-1$
}
}
private class BlockFormattingPrefixSuffix implements BlockContext {
private String prefix;
private String suffix;
private int start;
public BlockFormattingPrefixSuffix(String prefix, String suffix, int start) {
this.start= start;
this.suffix= suffix;
this.prefix= prefix;
}
public String[] getPrefixAndSuffix(int indent, ASTNode node, RewriteEventStore events) {
String nodeString= ASTRewriteFlattener.asString(node, events);
int nodeStart= this.prefix.length();
int nodeEnd= nodeStart + nodeString.length() - 1;
String str= this.prefix + nodeString + this.suffix;
Position pos1= new Position(this.start, nodeStart + 1 - this.start);
Position pos2= new Position(nodeEnd, 2);
TextEdit res= formatString(CodeFormatter.K_STATEMENTS, str, 0, str.length(), indent);
if (res != null) {
str= evaluateFormatterEdit(str, res, new Position[] { pos1, pos2 });
}
return new String[] {
str.substring(pos1.offset + 1, pos1.offset + pos1.length - 1),
str.substring(pos2.offset + 1, pos2.offset + pos2.length - 1)
};
}
}
public final static Prefix NONE= new ConstPrefix(""); //$NON-NLS-1$
public final static Prefix SPACE= new ConstPrefix(" "); //$NON-NLS-1$
public final static Prefix ASSERT_COMMENT= new ConstPrefix(" : "); //$NON-NLS-1$
public final Prefix VAR_INITIALIZER= new FormattingPrefix("A a={};", "a={" , CodeFormatter.K_STATEMENTS); //$NON-NLS-1$ //$NON-NLS-2$
public final Prefix METHOD_BODY= new FormattingPrefix("void a() {}", ") {" , CodeFormatter.K_CLASS_BODY_DECLARATIONS); //$NON-NLS-1$ //$NON-NLS-2$
public final Prefix FINALLY_BLOCK= new FormattingPrefix("try {} finally {}", "} finally {", CodeFormatter.K_STATEMENTS); //$NON-NLS-1$ //$NON-NLS-2$
public final Prefix CATCH_BLOCK= new FormattingPrefix("try {} catch(Exception e) {}", "} c" , CodeFormatter.K_STATEMENTS); //$NON-NLS-1$ //$NON-NLS-2$
public final Prefix ANNOT_MEMBER_DEFAULT= new FormattingPrefix("String value() default 1;", ") default 1" , CodeFormatter.K_CLASS_BODY_DECLARATIONS); //$NON-NLS-1$ //$NON-NLS-2$
public final Prefix ENUM_BODY_START= new FormattingPrefix("enum E { A(){void foo(){}} }", "){v" , CodeFormatter.K_COMPILATION_UNIT); //$NON-NLS-1$ //$NON-NLS-2$
public final Prefix ENUM_BODY_END= new FormattingPrefix("enum E { A(){void foo(){ }}, B}", "}}," , CodeFormatter.K_COMPILATION_UNIT); //$NON-NLS-1$ //$NON-NLS-2$
public final Prefix WILDCARD_EXTENDS= new FormattingPrefix("A a;", "? extends B" , CodeFormatter.K_CLASS_BODY_DECLARATIONS); //$NON-NLS-1$ //$NON-NLS-2$
public final Prefix WILDCARD_SUPER= new FormattingPrefix("A a;", "? super B" , CodeFormatter.K_CLASS_BODY_DECLARATIONS); //$NON-NLS-1$ //$NON-NLS-2$
public final Prefix FIRST_ENUM_CONST= new FormattingPrefix("enum E { X;}", "{ X" , CodeFormatter.K_COMPILATION_UNIT); //$NON-NLS-1$ //$NON-NLS-2$
public final Prefix ANNOTATION_SEPARATION= new FormattingPrefix("@A @B class C {}", "A @" , CodeFormatter.K_COMPILATION_UNIT); //$NON-NLS-1$ //$NON-NLS-2$
public final Prefix PARAM_ANNOTATION_SEPARATION= new FormattingPrefix("void foo(@A @B C p) { }", "A @" , CodeFormatter.K_CLASS_BODY_DECLARATIONS); //$NON-NLS-1$ //$NON-NLS-2$
public final Prefix LOCAL_ANNOTATION_SEPARATION= new FormattingPrefix("@A @B C p;", "A @" , CodeFormatter.K_STATEMENTS); //$NON-NLS-1$ //$NON-NLS-2$
public final Prefix TYPE_ANNOTATION_SEPARATION= new FormattingPrefix("C<@A @B D> l;", "A @" , CodeFormatter.K_STATEMENTS); //$NON-NLS-1$ //$NON-NLS-2$
public final Prefix VARARGS= new FormattingPrefix("void foo(A ... a) { }", "A ." , CodeFormatter.K_CLASS_BODY_DECLARATIONS); //$NON-NLS-1$ //$NON-NLS-2$
public final Prefix TRY_RESOURCES = new FormattingPrefix("try (A a = new A(); B b = new B()) {}", "; B" , CodeFormatter.K_STATEMENTS); //$NON-NLS-1$ //$NON-NLS-2$
public final Prefix TRY_RESOURCES_PAREN = new FormattingPrefix("try (A a = new A(); B b = new B()) {}", "y (" , CodeFormatter.K_STATEMENTS); //$NON-NLS-1$ //$NON-NLS-2$
public final BlockContext IF_BLOCK_WITH_ELSE= new BlockFormattingPrefixSuffix("if (true)", "else{}", 8); //$NON-NLS-1$ //$NON-NLS-2$
public final BlockContext IF_BLOCK_NO_ELSE= new BlockFormattingPrefix("if (true)", 8); //$NON-NLS-1$
public final BlockContext ELSE_AFTER_STATEMENT= new BlockFormattingPrefix("if (true) foo();else ", 15); //$NON-NLS-1$
public final BlockContext ELSE_AFTER_BLOCK= new BlockFormattingPrefix("if (true) {}else ", 11); //$NON-NLS-1$
public final BlockContext FOR_BLOCK= new BlockFormattingPrefix("for (;;) ", 7); //$NON-NLS-1$
public final BlockContext WHILE_BLOCK= new BlockFormattingPrefix("while (true)", 11); //$NON-NLS-1$
public final BlockContext DO_BLOCK= new BlockFormattingPrefixSuffix("do ", "while (true);", 1); //$NON-NLS-1$ //$NON-NLS-2$
}
