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| Is Java Identifier and get Java Identifier | |
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/*
GNU LESSER GENERAL PUBLIC LICENSE
Copyright (C) 2006 The Lobo Project
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Contact info: [email protected]
*/
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
public class Strings
{
private static final MessageDigest MESSAGE_DIGEST;
public static final String[] EMPTY_ARRAY = new String[0];
static {
MessageDigest md;
try {
md = MessageDigest.getInstance("MD5");
} catch(NoSuchAlgorithmException err) {
throw new IllegalStateException();
}
MESSAGE_DIGEST = md;
}
public static boolean isBlank(String text) {
return text == null || "".equals(text);
}
public static int countLines(String text)
{
int startIdx = 0;
int lineCount = 1;
for(;;)
{
int lbIdx = text.indexOf('\n', startIdx);
if(lbIdx == -1)
{
break;
}
lineCount++;
startIdx = lbIdx + 1;
}
return lineCount;
}
public static boolean isJavaIdentifier(String id)
{
if(id == null)
{
return false;
}
int len = id.length();
if(len == 0)
{
return false;
}
if(!Character.isJavaIdentifierStart(id.charAt(0)))
{
return false;
}
for(int i = 1; i < len; i++)
{
if(!Character.isJavaIdentifierPart(id.charAt(i)))
{
return false;
}
}
return true;
}
public static String getJavaStringLiteral(String text) {
StringBuffer buf = new StringBuffer();
buf.append('"');
int len = text.length();
for(int i = 0; i < len; i++) {
char ch = text.charAt(i);
switch(ch) {
case '\\':
buf.append("\\\\");
break;
case '\n':
buf.append("\\n");
break;
case '\r':
buf.append("\\r");
break;
case '\t':
buf.append("\\t");
break;
case '"':
buf.append("\\\"");
break;
default:
buf.append(ch);
break;
}
}
buf.append('"');
return buf.toString();
}
public static String getJavaIdentifier(String candidateID) {
int len = candidateID.length();
StringBuffer buf = new StringBuffer();
for(int i = 0; i < len; i++)
{
char ch = candidateID.charAt(i);
boolean good = i == 0 ? Character.isJavaIdentifierStart(ch) : Character.isJavaIdentifierPart(ch);
if(good)
{
buf.append(ch);
}
else {
buf.append('_');
}
}
return buf.toString();
}
}
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