pjs/grendel/calypso/util/StringUtils.java

152 строки
4.1 KiB
Java
Исходник Обычный вид История

1998-09-09 04:52:38 +04:00
/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil -*-
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.0 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is the Grendel mail/news client.
*
* The Initial Developer of the Original Code is Netscape Communications
* Corporation. Portions created by Netscape are Copyright (C) 1997
* Netscape Communications Corporation. All Rights Reserved.
*/
package calypso.util;
public class StringUtils {
/**
* Uppercase the characters in aString.
*
* @see: java.lang.Character
*/
static public String UpperCase(String aString) {
StringBuf buf = StringBuf.Alloc();
buf.append(aString);
buf.toUpperCase();
aString = buf.toString();
StringBuf.Recycle(buf);
return aString;
}
/**
* Lowercase the characters in aString.
*
* @see: java.lang.Character
*/
static public String LowerCase(String aString) {
StringBuf buf = StringBuf.Alloc();
buf.append(aString);
buf.toLowerCase();
aString = buf.toString();
StringBuf.Recycle(buf);
return aString;
}
/**
* Return true if the string buffer contains nothing but whitespace
* as defined by Character.isWhitespace()
*
* @see: java.lang.Character
*/
static public boolean IsWhitespace(String aString) {
// XXX this should just loop right here instead of copying
// the string because the loop will be inlined with a good
// compiler
StringBuf buf = StringBuf.Alloc();
buf.append(aString);
boolean rv = buf.isWhitespace();
StringBuf.Recycle(buf);
return rv;
}
/**
* Translate an integer into a string that is at least aDigits
* wide. Pad with zeros if necessary.
*/
static public String ToHex(int i, int aDigits) {
String rv = Integer.toString(i, 16);
int len = rv.length();
if (len < aDigits) {
StringBuf buf = StringBuf.Alloc();
len = aDigits - len;
while (--len >= 0) {
buf.append('0');
}
buf.append(rv);
rv = buf.toString();
StringBuf.Recycle(buf);
}
return rv;
}
/**
* Compress the whitespace out of a string and return a new string
*/
static public String CompressWhitespace(String aString, boolean aLeading) {
StringBuf buf = StringBuf.Alloc();
buf.append(aString);
buf.compressWhitespace(aLeading);
String rv = buf.toString();
StringBuf.Recycle(buf);
return rv;
}
/**
* Quote a string using java source file rules. The result is a new
* string with all the appropriate data quoted. The outer quotes that
* would be required in a java source file are not provided by this
* routine unless aProvideOuterQuotes is true.
*/
static char[] hex;
static {
hex = new char[16];
"0123456789abcdef".getChars(0, 16, hex, 0);
}
static public String JavaQuote(String aString, boolean aProvideOuterQuotes)
{
StringBuf buf = StringBuf.Alloc();
if (aProvideOuterQuotes) {
buf.append('"');
}
for (int i = 0, n = aString.length(); i < n; i++) {
char ch = aString.charAt(i);
switch (ch) {
case '\n':
buf.append("\\n");
break;
case '\r':
buf.append("\\r");
break;
case '\t':
buf.append("\\t");
break;
case '"':
buf.append("\\\"");
break;
default:
if ((ch < 32) || (ch >= 127)) {
buf.append("\\u");
buf.append(hex[(ch >> 12) & 0xf]);
buf.append(hex[(ch >> 8) & 0xf]);
buf.append(hex[(ch >> 4) & 0xf]);
buf.append(hex[ch & 0xf]);
} else {
buf.append(ch);
}
}
}
if (aProvideOuterQuotes) {
buf.append('"');
}
String rv = buf.toString();
StringBuf.Recycle(buf);
return rv;
}
}