stringutil.java

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        while (b <= ln) {
            e = s.indexOf(c, b);
            if (e == -1) e = ln;
            res[i++] = s.substring(b, e);
            b = e + 1;
        }
        return res;
    }

    /**
     * Splits a string at the specified string.
     */
    public static String[] split(String s, String sep, boolean caseInsensitive) {
        String splitString = caseInsensitive ? sep.toLowerCase() : sep;
        String input = caseInsensitive ? s.toLowerCase() : s;
        int i, b, e;
        int cnt;
        String res[];
        int ln = s.length();
        int sln = sep.length();

        if (sln == 0) throw new IllegalArgumentException(
                "The separator string has 0 length");

        i = 0;
        cnt = 1;
        while ((i = input.indexOf(splitString, i)) != -1) {
            cnt++;
            i += sln;
        }
        res = new String[cnt];

        i = 0;
        b = 0;
        while (b <= ln) {
            e = input.indexOf(splitString, b);
            if (e == -1) e = ln;
            res[i++] = s.substring(b, e);
            b = e + sln;
        }
        return res;
    }

    /**
     * Replaces all occurrences of a sub-string in a string.
     * @param text The string where it will replace <code>oldsub</code> with
     *     <code>newsub</code>.
     * @return String The string after the replacements.
     */
    public static String replace(String text, 
                                  String oldsub, 
                                  String newsub, 
                                  boolean caseInsensitive,
                                  boolean firstOnly) 
    {
        StringBuffer buf;
        int tln;
        int oln = oldsub.length();
        
        if (oln == 0) {
            int nln = newsub.length();
            if (nln == 0) {
                return text;
            } else {
                if (firstOnly) {
                    return newsub + text;
                } else {
                    tln = text.length();
                    buf = new StringBuffer(tln + (tln + 1) * nln);
                    buf.append(newsub);
                    for (int i = 0; i < tln; i++) {
                        buf.append(text.charAt(i));
                        buf.append(newsub);
                    }
                    return buf.toString();
                }
            }
        } else {
            oldsub = caseInsensitive ? oldsub.toLowerCase() : oldsub;
            String input = caseInsensitive ? text.toLowerCase() : text;
            int e = input.indexOf(oldsub);
            if (e == -1) {
                return text;
            }
            int b = 0;
            tln = text.length();
            buf = new StringBuffer(
                    tln + Math.max(newsub.length() - oln, 0) * 3);
            do {
                buf.append(text.substring(b, e));
                buf.append(newsub);
                b = e + oln;
                e = input.indexOf(oldsub, b);
            } while (e != -1 && !firstOnly);
            buf.append(text.substring(b));
            return buf.toString();
        }
    }

    /**
     * Removes the line-break from the end of the string.
     */
    public static String chomp(String s) {
        if (s.endsWith("\r\n")) return s.substring(0, s.length() - 2);
        if (s.endsWith("\r") || s.endsWith("\n"))
                return s.substring(0, s.length() - 1);
        return s;
    }

    /**
     * Quotes string as Java Language string literal.
     * Returns string <code>"null"</code> if <code>s</code>
     * is <code>null</code>.
     */
    public static String jQuote(String s) {
        if (s == null) {
            return "null";
        }
        int ln = s.length();
        StringBuffer b = new StringBuffer(ln + 4);
        b.append('"');
        for (int i = 0; i < ln; i++) {
            char c = s.charAt(i);
            if (c == '"') {
                b.append("\\\"");
            } else if (c == '\\') {
                b.append("\\\\");
            } else if (c < 0x20) {
                if (c == '\n') {
                    b.append("\\n");
                } else if (c == '\r') {
                    b.append("\\r");
                } else if (c == '\f') {
                    b.append("\\f");
                } else if (c == '\b') {
                    b.append("\\b");
                } else if (c == '\t') {
                    b.append("\\t");
                } else {
                    b.append("\\u00");
                    int x = c / 0x10;
                    b.append((char) (x < 0xA ? x + '0' : x - 0xA + 'A'));
                    x = c & 0xF;
                    b.append((char) (x < 0xA ? x + '0' : x - 0xA + 'A'));
                }
            } else {
                b.append(c);
            }
        } // for each characters
        b.append('"');
        return b.toString();
    }

    /**
     * Escapes the <code>String</code> with the escaping rules of Java language
     * string literals, so it is safe to insert the value into a string literal.
     * The resulting string will not be quoted.
     * 
     * <p>In additional, all characters under UCS code point 0x20, that has no
     * dedicated escape sequence in Java language, will be replaced with UNICODE
     * escape (<tt>\<!-- -->u<i>XXXX</i></tt>).
     * 
     * @see #jQuote(String)
     */ 
    public static String javaStringEnc(String s) {
        int ln = s.length();
        for (int i = 0; i < ln; i++) {
            char c = s.charAt(i);
            if (c == '"' || c == '\\' || c < 0x20) {
                StringBuffer b = new StringBuffer(ln + 4);
                b.append(s.substring(0, i));
                while (true) {
                    if (c == '"') {
                        b.append("\\\"");
                    } else if (c == '\\') {
                        b.append("\\\\");
                    } else if (c < 0x20) {
                        if (c == '\n') {
                            b.append("\\n");
                        } else if (c == '\r') {
                            b.append("\\r");
                        } else if (c == '\f') {
                            b.append("\\f");
                        } else if (c == '\b') {
                            b.append("\\b");
                        } else if (c == '\t') {
                            b.append("\\t");
                        } else {
                            b.append("\\u00");
                            int x = c / 0x10;
                            b.append((char)
                                    (x < 0xA ? x + '0' : x - 0xA + 'a'));
                            x = c & 0xF;
                            b.append((char)
                                    (x < 0xA ? x + '0' : x - 0xA + 'a'));
                        }
                    } else {
                        b.append(c);
                    }
                    i++;
                    if (i >= ln) {
                        return b.toString();
                    }
                    c = s.charAt(i);
                }
            } // if has to be escaped
        } // for each characters
        return s;
    }
    
    /**
     * Escapes a <code>String</code> according the JavaScript string literal
     * escaping rules. The resulting string will not be quoted.
     * 
     * <p>It escapes both <tt>'</tt> and <tt>"</tt>.
     * In additional it escapes <tt>></tt> as <tt>\></tt> (to avoid
     * <tt>&lt;/script></tt>). Furthermore, all characters under UCS code point
     * 0x20, that has no dedicated escape sequence in JavaScript language, will
     * be replaced with hexadecimal escape (<tt>\x<i>XX</i></tt>). 
     */ 
    public static String javaScriptStringEnc(String s) {
        int ln = s.length();
        for (int i = 0; i < ln; i++) {
            char c = s.charAt(i);
            if (c == '"' || c == '\'' || c == '\\' || c == '>' || c < 0x20) {
                StringBuffer b = new StringBuffer(ln + 4);
                b.append(s.substring(0, i));
                while (true) {
                    if (c == '"') {
                        b.append("\\\"");
                    } else if (c == '\'') {
                        b.append("\\'");
                    } else if (c == '\\') {
                        b.append("\\\\");
                    } else if (c == '>') {
                        b.append("\\>");
                    } else if (c < 0x20) {
                        if (c == '\n') {
                            b.append("\\n");
                        } else if (c == '\r') {
                            b.append("\\r");
                        } else if (c == '\f') {
                            b.append("\\f");
                        } else if (c == '\b') {
                            b.append("\\b");
                        } else if (c == '\t') {
                            b.append("\\t");
                        } else {
                            b.append("\\x");
                            int x = c / 0x10;
                            b.append((char)
                                    (x < 0xA ? x + '0' : x - 0xA + 'A'));
                            x = c & 0xF;
                            b.append((char)
                                    (x < 0xA ? x + '0' : x - 0xA + 'A'));
                        }
                    } else {
                        b.append(c);
                    }
                    i++;
                    if (i >= ln) {
                        return b.toString();
                    }
                    c = s.charAt(i);
                }
            } // if has to be escaped
        } // for each characters
        return s;
    }

    /**
     * Parses a name-value pair list, where the pairs are separated with comma,
     * and the name and value is separated with colon.
     * The keys and values can contain only letters, digits and <tt>_</tt>. They
     * can't be quoted. White-space around the keys and values are ignored. The
     * value can be omitted if <code>defaultValue</code> is not null. When a
     * value is omitted, then the colon after the key must be omitted as well.
     * The same key can't be used for multiple times.
     * 
     * @param s the string to parse.
     *     For example: <code>"strong:100, soft:900"</code>.
     * @param defaultValue the value used when the value is omitted in a
     *     key-value pair.
     * 
     * @return the map that contains the name-value pairs.
     * 
     * @throws java.text.ParseException if the string is not a valid name-value
     *     pair list.
     */
    public static Map parseNameValuePairList(String s, String defaultValue)
    throws java.text.ParseException {
        Map map = new HashMap();
        
        char c = ' ';
        int ln = s.length();
        int p = 0;
        int keyStart;
        int valueStart;
        String key;
        String value;
        
        fetchLoop: while (true) {
            // skip ws
            while (p < ln) {
                c = s.charAt(p);
                if (!Character.isWhitespace(c)) {
                    break;
                }
                p++;
            }
            if (p == ln) {
                break fetchLoop;
            }
            keyStart = p;

            // seek key end
            while (p < ln) {
                c = s.charAt(p);
                if (!(Character.isLetterOrDigit(c) || c == '_')) {
                    break;
                }
                p++;
            }
            if (keyStart == p) {