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Groovy example source code file (StringHelper.java)

This example Groovy source code file (StringHelper.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

double_quote, double_quote, linkedlist, list, single_quote, single_quote, space, space, space==c, string, string, stringhelper, util

The Groovy StringHelper.java source code

/*
 * Copyright 2003-2010 the original author or authors.
 *
 * 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 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[0]);
    }

    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;
    } 
}

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