org.codehaus.groovy.tools.StringHelper Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.codehaus.groovy.tools;
import java.util.LinkedList;
import java.util.List;
public class StringHelper {
private static final char
SPACE = ' ', SINGLE_QUOTE = '\'', DOUBLE_QUOTE = '"';
/**
* This method tokenizes a string by space characters,
* but ignores spaces in quoted parts,that are parts in
* '' or "". The method does allows the usage of "" in ''
* and '' in "". The space character between tokens is not
* returned.
*
* @param s the string to tokenize
* @return the tokens
*/
public static String[] tokenizeUnquoted(String s) {
List tokens = new LinkedList();
int first = 0;
while (first < s.length()) {
first = skipWhitespace(s, first);
int last = scanToken(s, first);
if (first < last) {
tokens.add(s.substring(first, last));
}
first = last;
}
return (String[])tokens.toArray(new String[tokens.size()]);
}
private static int scanToken(String s, int pos0) {
int pos = pos0;
while (pos < s.length()) {
char c = s.charAt(pos);
if (SPACE==c) break;
pos++;
if (SINGLE_QUOTE == c) {
pos = scanQuoted(s, pos, SINGLE_QUOTE);
} else if (DOUBLE_QUOTE == c) {
pos = scanQuoted(s, pos, DOUBLE_QUOTE);
}
}
return pos;
}
private static int scanQuoted(String s, int pos0, char quote) {
int pos = pos0;
while (pos < s.length()) {
char c = s.charAt(pos++);
if (quote == c) break;
}
return pos;
}
private static int skipWhitespace(String s, int pos0) {
int pos = pos0;
while (pos < s.length()) {
char c = s.charAt(pos);
if (SPACE!=c) break;
pos++;
}
return pos;
}
}