/*
* Copyright 2011 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.codegen.server;
/**
* Helper class for code generators.
*/
public class CodeGenUtils {
/**
* Produce a string which represents a string literal in Java source,
* including null values.
*
* @param literal
* @return Java source representation of the string literal
*/
public static String asStringLiteral(String literal) {
return literal == null ? "null" : '"' + escape(literal) + '"';
}
/**
* Escapes string content to be a valid string literal.
*
* @param unescaped
* @return an escaped version of <code>unescaped</code>, suitable for being
* enclosed in double quotes in Java source
*/
public static String escape(String unescaped) {
int extra = 0;
for (int in = 0, n = unescaped.length(); in < n; ++in) {
switch (unescaped.charAt(in)) {
case '\0':
case '\n':
case '\r':
case '\"':
case '\\':
++extra;
break;
}
}
if (extra == 0) {
return unescaped;
}
char[] oldChars = unescaped.toCharArray();
char[] newChars = new char[oldChars.length + extra];
for (int in = 0, out = 0, n = oldChars.length; in < n; ++in, ++out) {
char c = oldChars[in];
switch (c) {
case '\0':
newChars[out++] = '\\';
c = '0';
break;
case '\n':
newChars[out++] = '\\';
c = 'n';
break;
case '\r':
newChars[out++] = '\\';
c = 'r';
break;
case '\"':
newChars[out++] = '\\';
c = '"';
break;
case '\\':
newChars[out++] = '\\';
c = '\\';
break;
}
newChars[out] = c;
}
return String.valueOf(newChars);
}
private CodeGenUtils() {
}
}