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With inspiration from other libraries
/*
* [The "BSD license"]
* Copyright (c) 2011 Terence Parr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.stringtemplate.v4.misc;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.Iterator;
public class Misc {
public static final String newline = System.getProperty("line.separator");
/** Makes it clear when a comparison is intended as reference equality.
*/
public static boolean referenceEquals(Object x, Object y) {
return x == y;
}
// Seriously: why isn't this built in to java?
public static String join(Iterator iter, String separator) {
StringBuilder buf = new StringBuilder();
while ( iter.hasNext() ) {
buf.append(iter.next());
if ( iter.hasNext() ) {
buf.append(separator);
}
}
return buf.toString();
}
// public static String join(Object[] a, String separator, int start, int stop) {
// StringBuilder buf = new StringBuilder();
// for (int i = start; i < stop; i++) {
// if ( i>start ) buf.append(separator);
// buf.append(a[i].toString());
// }
// return buf.toString();
// }
public static String strip(String s, int n) {
return s.substring(n, s.length()-n);
}
// public static String stripRight(String s, int n) {
// return s.substring(0, s.length()-n);
// }
/** Strip a single newline character from the front of {@code s}. */
public static String trimOneStartingNewline(String s) {
if ( s.startsWith("\r\n") ) s = s.substring(2);
else if ( s.startsWith("\n") ) s = s.substring(1);
return s;
}
/** Strip a single newline character from the end of {@code s}. */
public static String trimOneTrailingNewline(String s) {
if ( s.endsWith("\r\n") ) s = s.substring(0, s.length()-2);
else if ( s.endsWith("\n") ) s = s.substring(0, s.length()-1);
return s;
}
/** Given, say, {@code file:/tmp/test.jar!/org/foo/templates/main.stg}
* convert to {@code file:/tmp/test.jar!/org/foo/templates}
*/
public static String stripLastPathElement(String f) {
int slash = f.lastIndexOf('/');
if ( slash<0 ) return f;
return f.substring(0, slash);
}
public static String getFileNameNoSuffix(String f) {
if (f==null) return null;
f = getFileName(f);
return f.substring(0,f.lastIndexOf('.'));
}
public static String getFileName(String fullFileName) {
if (fullFileName==null) return null;
File f = new File(fullFileName); // strip to simple name
return f.getName();
}
public static String getParent(String name) {
//System.out.println("getParent("+name+")="+p);
if (name==null) return null;
int lastSlash=name.lastIndexOf('/');
if (lastSlash>0) return name.substring(0, lastSlash);
if (lastSlash==0) return "/";
//System.out.println("getParent("+name+")="+p);
return "";
}
public static String getPrefix(String name) {
if (name==null) return "/";
String parent = getParent(name);
String prefix = parent;
if ( !parent.endsWith("/") ) prefix += '/';
return prefix;
}
public static String replaceEscapes(String s) {
s = s.replaceAll("\n", "\\\\n");
s = s.replaceAll("\r", "\\\\r");
s = s.replaceAll("\t", "\\\\t");
return s;
}
/** Replace >\> with >> in s. Replace \>> unless prefix of \>>> with >>.
* Do NOT replace if it's <\\>
*/
public static String replaceEscapedRightAngle(String s) {
StringBuilder buf = new StringBuilder();
int i = 0;
while ( i") ) {
buf.append("<\\\\>");
i += "<\\\\>".length();
continue;
}
if ( c=='>' && s.substring(i).startsWith(">\\>") ) {
buf.append(">>");
i += ">\\>".length();
continue;
}
if ( c=='\\' && s.substring(i).startsWith("\\>>") &&
!s.substring(i).startsWith("\\>>>") )
{
buf.append(">>");
i += "\\>>".length();
continue;
}
buf.append(c);
i++;
}
return buf.toString();
}
public static boolean urlExists(URL url) {
try {
// In Spring Boot context the URL can be like this:
// jar:file:/path/to/myapp.jar!/BOOT-INF/lib/mylib.jar!/org/foo/templates/g.stg
// This url cannot be processed using standard URLClassLoader
URLConnection con = url.openConnection();
InputStream is = con.getInputStream();
try {
is.close();
} catch (Throwable e) {
// Closing the input stream may throw an exception. See bug below. Most probabaly it was
// the true reason for this commit:
// https://github.com/antlr/stringtemplate4/commit/21484ed46f1b20b2cdaec49f9d5a626fb26a493c
// https://bugs.openjdk.java.net/browse/JDK-8080094
// e.printStackTrace();
}
return true;
}
catch (IOException ioe) {
return false;
}
}
/**
* Given {@code index} into string {@code s}, compute the line and char
* position in line.
*/
public static Coordinate getLineCharPosition(String s, int index) {
int line = 1;
int charPos = 0;
int p = 0;
while ( p < index ) { // don't care about s[index] itself; count before
if ( s.charAt(p)=='\n' ) { line++; charPos=0; }
else charPos++;
p++;
}
return new Coordinate(line,charPos);
}
}