| /******************************************************************************* |
| * 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 Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| |
| package org.eclipse.jdt.core.dom; |
| |
| import org.eclipse.jdt.core.compiler.InvalidInputException; |
| import org.eclipse.jdt.internal.compiler.parser.Scanner; |
| import org.eclipse.jdt.internal.compiler.parser.TerminalTokens; |
| |
| /** |
| * String literal nodes. |
| * |
| * @since 2.0 |
| */ |
| public class StringLiteral extends Expression { |
| |
| /** |
| * The literal string, including quotes and escapes; defaults to the |
| * literal for the empty string. |
| */ |
| private String escapedValue = "\"\"";//$NON-NLS-1$ |
| |
| /** |
| * Creates a new unparented string literal node owned by the given AST. |
| * By default, the string literal denotes the empty string. |
| * <p> |
| * N.B. This constructor is package-private. |
| * </p> |
| * |
| * @param ast the AST that is to own this node |
| */ |
| StringLiteral(AST ast) { |
| super(ast); |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| public int getNodeType() { |
| return STRING_LITERAL; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| ASTNode clone(AST target) { |
| StringLiteral result = new StringLiteral(target); |
| result.setSourceRange(this.getStartPosition(), this.getLength()); |
| result.setEscapedValue(getEscapedValue()); |
| return result; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| public boolean subtreeMatch(ASTMatcher matcher, Object other) { |
| // dispatch to correct overloaded match method |
| return matcher.match(this, other); |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| void accept0(ASTVisitor visitor) { |
| visitor.visit(this); |
| visitor.endVisit(this); |
| } |
| |
| /** |
| * Returns the string value of this literal node to the given string |
| * literal token. The token is the sequence of characters that would appear |
| * in the source program, including enclosing double quotes and embedded |
| * escapes. |
| * |
| * @return the string literal token, including enclosing double |
| * quotes and embedded escapes |
| */ |
| public String getEscapedValue() { |
| return escapedValue; |
| } |
| |
| /** |
| * Sets the string value of this literal node to the given string literal |
| * token. The token is the sequence of characters that would appear in the |
| * source program, including enclosing double quotes and embedded escapes. |
| * For example, |
| * <ul> |
| * <li><code>""</code> <code>setLiteral("\"\"")</code></li> |
| * <li><code>"hello world"</code> <code>setLiteral("\"hello world\"")</code></li> |
| * <li><code>"boo\nhoo"</code> <code>setLiteral("\"boo\\nhoo\"")</code></li> |
| * </ul> |
| * |
| * @param token the string literal token, including enclosing double |
| * quotes and embedded escapes |
| * @exception IllegalArgumentException if the argument is incorrect |
| */ |
| public void setEscapedValue(String token) { |
| if (token == null) { |
| throw new IllegalArgumentException("Token cannot be null"); //$NON-NLS-1$ |
| } |
| Scanner scanner = getAST().scanner; |
| char[] source = token.toCharArray(); |
| scanner.setSource(source); |
| scanner.resetTo(0, source.length); |
| try { |
| int tokenType = scanner.getNextToken(); |
| switch(tokenType) { |
| case TerminalTokens.TokenNameStringLiteral: |
| break; |
| default: |
| throw new IllegalArgumentException("Invalid string literal : >" + token + "<"); //$NON-NLS-1$//$NON-NLS-2$ |
| } |
| } catch(InvalidInputException e) { |
| throw new IllegalArgumentException("Invalid string literal : >" + token + "<");//$NON-NLS-1$//$NON-NLS-2$ |
| } |
| modifying(); |
| this.escapedValue = token; |
| } |
| |
| /** |
| * Returns the value of this literal node. |
| * <p> |
| * For example, |
| * <code> |
| * <pre> |
| * StringLiteral s; |
| * s.setEscapedValue("\"hello\\nworld\""); |
| * assert s.getLiteralValue().equals("hello\nworld"); |
| * </pre> |
| * </p> |
| * <p> |
| * Note that this is a convenience method that converts from the stored |
| * string literal token returned by <code>getEscapedLiteral</code>. |
| * </p> |
| * |
| * @return the string value without enclosing double quotes and embedded |
| * escapes |
| * @exception IllegalArgumentException if the literal value cannot be converted |
| */ |
| public String getLiteralValue() { |
| String s = getEscapedValue(); |
| int len = s.length(); |
| if (len < 2 || s.charAt(0) != '\"' || s.charAt(len-1) != '\"' ) { |
| throw new IllegalArgumentException(); |
| } |
| |
| Scanner scanner = getAST().scanner; |
| char[] source = s.toCharArray(); |
| scanner.setSource(source); |
| scanner.resetTo(0, source.length); |
| try { |
| int tokenType = scanner.getNextToken(); |
| switch(tokenType) { |
| case TerminalTokens.TokenNameStringLiteral: |
| return new String(scanner.getCurrentTokenSourceString()); |
| default: |
| throw new IllegalArgumentException(); |
| } |
| } catch(InvalidInputException e) { |
| throw new IllegalArgumentException(); |
| } |
| } |
| |
| /** |
| * Sets the value of this literal node. |
| * <p> |
| * For example, |
| * <code> |
| * <pre> |
| * StringLiteral s; |
| * s.setLiteralValue("hello\nworld"); |
| * assert s.getEscapedValue("\"hello\\nworld\""); |
| * assert s.getLiteralValue().equals("hello\nworld"); |
| * </pre> |
| * </p> |
| * <p> |
| * Note that this is a convenience method that converts to the stored |
| * string literal token acceptable to <code>setEscapedLiteral</code>. |
| * </p> |
| * |
| * @param value the string value without enclosing double quotes and |
| * embedded escapes |
| * @exception IllegalArgumentException if the argument is incorrect |
| */ |
| public void setLiteralValue(String value) { |
| if (value == null) { |
| throw new IllegalArgumentException(); |
| } |
| int len = value.length(); |
| StringBuffer b = new StringBuffer(len + 2); |
| |
| b.append("\""); // opening delimiter //$NON-NLS-1$ |
| for (int i = 0; i < len; i++) { |
| char c = value.charAt(i); |
| switch(c) { |
| case '\b' : |
| b.append("\\b"); //$NON-NLS-1$ |
| break; |
| case '\t' : |
| b.append("\\t"); //$NON-NLS-1$ |
| break; |
| case '\n' : |
| b.append("\\n"); //$NON-NLS-1$ |
| break; |
| case '\f' : |
| b.append("\\f"); //$NON-NLS-1$ |
| break; |
| case '\r' : |
| b.append("\\r"); //$NON-NLS-1$ |
| break; |
| case '\"': |
| b.append("\\\""); //$NON-NLS-1$ |
| break; |
| case '\'': |
| b.append("\\\'"); //$NON-NLS-1$ |
| break; |
| case '\\': |
| b.append("\\\\"); //$NON-NLS-1$ |
| break; |
| case '\0' : |
| b.append("\\0"); //$NON-NLS-1$ |
| break; |
| case '\1' : |
| b.append("\\1"); //$NON-NLS-1$ |
| break; |
| case '\2' : |
| b.append("\\2"); //$NON-NLS-1$ |
| break; |
| case '\3' : |
| b.append("\\3"); //$NON-NLS-1$ |
| break; |
| case '\4' : |
| b.append("\\4"); //$NON-NLS-1$ |
| break; |
| case '\5' : |
| b.append("\\5"); //$NON-NLS-1$ |
| break; |
| case '\6' : |
| b.append("\\6"); //$NON-NLS-1$ |
| break; |
| case '\7' : |
| b.append("\\7"); //$NON-NLS-1$ |
| break; |
| default: |
| b.append(c); |
| } |
| } |
| b.append("\""); // closing delimiter //$NON-NLS-1$ |
| setEscapedValue(b.toString()); |
| } |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| int memSize() { |
| int size = BASE_NODE_SIZE + 1 * 4 + stringSize(escapedValue); |
| return size; |
| } |
| |
| /* (omit javadoc for this method) |
| * Method declared on ASTNode. |
| */ |
| int treeSize() { |
| return memSize(); |
| } |
| } |