| /******************************************************************************* |
| * Copyright (c) 2000, 2004 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.compiler.parser; |
| |
| /** |
| * Internal block structure for parsing recovery |
| */ |
| import org.eclipse.jdt.core.compiler.*; |
| import org.eclipse.jdt.internal.compiler.ast.Argument; |
| import org.eclipse.jdt.internal.compiler.ast.ASTNode; |
| import org.eclipse.jdt.internal.compiler.ast.Block; |
| import org.eclipse.jdt.internal.compiler.ast.FieldDeclaration; |
| import org.eclipse.jdt.internal.compiler.ast.LocalDeclaration; |
| import org.eclipse.jdt.internal.compiler.ast.Statement; |
| import org.eclipse.jdt.internal.compiler.ast.TypeDeclaration; |
| import org.eclipse.jdt.internal.compiler.lookup.BaseTypes; |
| import org.eclipse.jdt.internal.compiler.lookup.CompilerModifiers; |
| |
| public class RecoveredBlock extends RecoveredStatement implements CompilerModifiers, TerminalTokens, BaseTypes { |
| |
| public Block blockDeclaration; |
| public RecoveredStatement[] statements; |
| public int statementCount; |
| public boolean preserveContent = false; |
| public RecoveredLocalVariable pendingArgument; |
| |
| public RecoveredBlock(Block block, RecoveredElement parent, int bracketBalance){ |
| super(block, parent, bracketBalance); |
| this.blockDeclaration = block; |
| this.foundOpeningBrace = true; |
| } |
| /* |
| * Record a nested block declaration |
| */ |
| public RecoveredElement add(Block nestedBlockDeclaration, int bracketBalanceValue) { |
| |
| /* do not consider a nested block starting passed the block end (if set) |
| it must be belonging to an enclosing block */ |
| if (this.blockDeclaration.sourceEnd != 0 |
| && nestedBlockDeclaration.sourceStart > this.blockDeclaration.sourceEnd){ |
| return this.parent.add(nestedBlockDeclaration, bracketBalanceValue); |
| } |
| |
| RecoveredBlock element = new RecoveredBlock(nestedBlockDeclaration, this, bracketBalanceValue); |
| |
| // if we have a pending Argument, promote it into the new block |
| if (this.pendingArgument != null){ |
| element.attach(this.pendingArgument); |
| this.pendingArgument = null; |
| } |
| this.attach(element); |
| if (nestedBlockDeclaration.sourceEnd == 0) return element; |
| return this; |
| } |
| /* |
| * Record a local declaration |
| */ |
| public RecoveredElement add(LocalDeclaration localDeclaration, int bracketBalanceValue) { |
| return this.add(localDeclaration, bracketBalanceValue, false); |
| } |
| /* |
| * Record a local declaration |
| */ |
| public RecoveredElement add(LocalDeclaration localDeclaration, int bracketBalanceValue, boolean delegatedByParent) { |
| |
| /* local variables inside method can only be final and non void */ |
| /* |
| char[][] localTypeName; |
| if ((localDeclaration.modifiers & ~AccFinal) != 0 // local var can only be final |
| || (localDeclaration.type == null) // initializer |
| || ((localTypeName = localDeclaration.type.getTypeName()).length == 1 // non void |
| && CharOperation.equals(localTypeName[0], VoidBinding.sourceName()))){ |
| |
| if (delegatedByParent){ |
| return this; //ignore |
| } else { |
| this.updateSourceEndIfNecessary(this.previousAvailableLineEnd(localDeclaration.declarationSourceStart - 1)); |
| return this.parent.add(localDeclaration, bracketBalance); |
| } |
| } |
| */ |
| /* do not consider a local variable starting passed the block end (if set) |
| it must be belonging to an enclosing block */ |
| if (this.blockDeclaration.sourceEnd != 0 |
| && localDeclaration.declarationSourceStart > this.blockDeclaration.sourceEnd){ |
| if (delegatedByParent) return this; //ignore |
| return this.parent.add(localDeclaration, bracketBalanceValue); |
| } |
| |
| RecoveredLocalVariable element = new RecoveredLocalVariable(localDeclaration, this, bracketBalanceValue); |
| |
| if (localDeclaration instanceof Argument){ |
| this.pendingArgument = element; |
| return this; |
| } |
| |
| this.attach(element); |
| if (localDeclaration.declarationSourceEnd == 0) return element; |
| return this; |
| } |
| /* |
| * Record a statement declaration |
| */ |
| public RecoveredElement add(Statement stmt, int bracketBalanceValue) { |
| return this.add(stmt, bracketBalanceValue, false); |
| } |
| |
| /* |
| * Record a statement declaration |
| */ |
| public RecoveredElement add(Statement stmt, int bracketBalanceValue, boolean delegatedByParent) { |
| |
| /* do not consider a nested block starting passed the block end (if set) |
| it must be belonging to an enclosing block */ |
| if (this.blockDeclaration.sourceEnd != 0 |
| && stmt.sourceStart > this.blockDeclaration.sourceEnd){ |
| if (delegatedByParent) return this; //ignore |
| return this.parent.add(stmt, bracketBalanceValue); |
| } |
| |
| RecoveredStatement element = new RecoveredStatement(stmt, this, bracketBalanceValue); |
| this.attach(element); |
| if (stmt.sourceEnd == 0) return element; |
| return this; |
| } |
| /* |
| * Addition of a type to an initializer (act like inside method body) |
| */ |
| public RecoveredElement add(TypeDeclaration typeDeclaration, int bracketBalanceValue) { |
| return this.add(typeDeclaration, bracketBalanceValue, false); |
| } |
| /* |
| * Addition of a type to an initializer (act like inside method body) |
| */ |
| public RecoveredElement add(TypeDeclaration typeDeclaration, int bracketBalanceValue, boolean delegatedByParent) { |
| |
| /* do not consider a type starting passed the block end (if set) |
| it must be belonging to an enclosing block */ |
| if (this.blockDeclaration.sourceEnd != 0 |
| && typeDeclaration.declarationSourceStart > this.blockDeclaration.sourceEnd){ |
| if (delegatedByParent) return this; //ignore |
| return this.parent.add(typeDeclaration, bracketBalanceValue); |
| } |
| |
| RecoveredStatement element = new RecoveredType(typeDeclaration, this, bracketBalanceValue); |
| this.attach(element); |
| if (typeDeclaration.declarationSourceEnd == 0) return element; |
| return this; |
| } |
| /* |
| * Attach a recovered statement |
| */ |
| void attach(RecoveredStatement recoveredStatement) { |
| |
| if (this.statements == null) { |
| this.statements = new RecoveredStatement[5]; |
| this.statementCount = 0; |
| } else { |
| if (this.statementCount == this.statements.length) { |
| System.arraycopy( |
| this.statements, |
| 0, |
| (this.statements = new RecoveredStatement[2 * this.statementCount]), |
| 0, |
| this.statementCount); |
| } |
| } |
| this.statements[this.statementCount++] = recoveredStatement; |
| } |
| /* |
| * Answer the associated parsed structure |
| */ |
| public ASTNode parseTree(){ |
| return this.blockDeclaration; |
| } |
| public String toString(int tab) { |
| StringBuffer result = new StringBuffer(tabString(tab)); |
| result.append("Recovered block:\n"); //$NON-NLS-1$ |
| this.blockDeclaration.print(tab + 1, result); |
| if (this.statements != null) { |
| for (int i = 0; i < this.statementCount; i++) { |
| result.append("\n"); //$NON-NLS-1$ |
| result.append(this.statements[i].toString(tab + 1)); |
| } |
| } |
| return result.toString(); |
| } |
| /* |
| * Rebuild a block from the nested structure which is in scope |
| */ |
| public Block updatedBlock(){ |
| |
| // if block was not marked to be preserved or empty, then ignore it |
| if (!this.preserveContent || this.statementCount == 0) return null; |
| |
| Statement[] updatedStatements = new Statement[this.statementCount]; |
| int updatedCount = 0; |
| |
| // only collect the non-null updated statements |
| for (int i = 0; i < this.statementCount; i++){ |
| Statement updatedStatement = this.statements[i].updatedStatement(); |
| if (updatedStatement != null){ |
| updatedStatements[updatedCount++] = updatedStatement; |
| } |
| } |
| if (updatedCount == 0) return null; // not interesting block |
| |
| // resize statement collection if necessary |
| if (updatedCount != this.statementCount){ |
| this.blockDeclaration.statements = new Statement[updatedCount]; |
| System.arraycopy(updatedStatements, 0, this.blockDeclaration.statements, 0, updatedCount); |
| } else { |
| this.blockDeclaration.statements = updatedStatements; |
| } |
| |
| return this.blockDeclaration; |
| } |
| /* |
| * Rebuild a statement from the nested structure which is in scope |
| */ |
| public Statement updatedStatement(){ |
| |
| return this.updatedBlock(); |
| } |
| /* |
| * A closing brace got consumed, might have closed the current element, |
| * in which case both the currentElement is exited |
| */ |
| public RecoveredElement updateOnClosingBrace(int braceStart, int braceEnd){ |
| if ((--this.bracketBalance <= 0) && (this.parent != null)){ |
| this.updateSourceEndIfNecessary(braceStart, braceEnd); |
| |
| /* if the block is the method body, then it closes the method too */ |
| RecoveredMethod method = enclosingMethod(); |
| if (method != null && method.methodBody == this){ |
| return this.parent.updateOnClosingBrace(braceStart, braceEnd); |
| } |
| RecoveredInitializer initializer = enclosingInitializer(); |
| if (initializer != null && initializer.initializerBody == this){ |
| return this.parent.updateOnClosingBrace(braceStart, braceEnd); |
| } |
| return this.parent; |
| } |
| return this; |
| } |
| /* |
| * An opening brace got consumed, might be the expected opening one of the current element, |
| * in which case the bodyStart is updated. |
| */ |
| public RecoveredElement updateOnOpeningBrace(int braceStart, int braceEnd){ |
| |
| // create a nested block |
| Block block = new Block(0); |
| block.sourceStart = parser().scanner.startPosition; |
| return this.add(block, 1); |
| } |
| /* |
| * Final update the corresponding parse node |
| */ |
| public void updateParseTree(){ |
| |
| this.updatedBlock(); |
| } |
| /* |
| * Rebuild a flattened block from the nested structure which is in scope |
| */ |
| public Statement updateStatement(){ |
| |
| // if block was closed or empty, then ignore it |
| if (this.blockDeclaration.sourceEnd != 0 || this.statementCount == 0) return null; |
| |
| Statement[] updatedStatements = new Statement[this.statementCount]; |
| int updatedCount = 0; |
| |
| // only collect the non-null updated statements |
| for (int i = 0; i < this.statementCount; i++){ |
| Statement updatedStatement = this.statements[i].updatedStatement(); |
| if (updatedStatement != null){ |
| updatedStatements[updatedCount++] = updatedStatement; |
| } |
| } |
| if (updatedCount == 0) return null; // not interesting block |
| |
| // resize statement collection if necessary |
| if (updatedCount != this.statementCount){ |
| this.blockDeclaration.statements = new Statement[updatedCount]; |
| System.arraycopy(updatedStatements, 0, this.blockDeclaration.statements, 0, updatedCount); |
| } else { |
| this.blockDeclaration.statements = updatedStatements; |
| } |
| |
| return this.blockDeclaration; |
| } |
| |
| /* |
| * Record a field declaration |
| */ |
| public RecoveredElement add(FieldDeclaration fieldDeclaration, int bracketBalanceValue) { |
| |
| /* local variables inside method can only be final and non void */ |
| char[][] fieldTypeName; |
| if ((fieldDeclaration.modifiers & ~AccFinal) != 0 // local var can only be final |
| || (fieldDeclaration.type == null) // initializer |
| || ((fieldTypeName = fieldDeclaration.type.getTypeName()).length == 1 // non void |
| && CharOperation.equals(fieldTypeName[0], VoidBinding.sourceName()))){ |
| this.updateSourceEndIfNecessary(this.previousAvailableLineEnd(fieldDeclaration.declarationSourceStart - 1)); |
| return this.parent.add(fieldDeclaration, bracketBalanceValue); |
| } |
| |
| /* do not consider a local variable starting passed the block end (if set) |
| it must be belonging to an enclosing block */ |
| if (this.blockDeclaration.sourceEnd != 0 |
| && fieldDeclaration.declarationSourceStart > this.blockDeclaration.sourceEnd){ |
| return this.parent.add(fieldDeclaration, bracketBalanceValue); |
| } |
| |
| // ignore the added field, since indicates a local variable behind recovery point |
| // which thus got parsed as a field reference. This can happen if restarting after |
| // having reduced an assistNode to get the following context (see 1GEK7SG) |
| return this; |
| } |
| } |