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StringTemplate is a java template engine for generating source code, web pages, emails, or any other formatted text output. StringTemplate is particularly good at multi-targeted code generators, multiple site skins, and internationalization/localization. It evolved over years of effort developing jGuru.com. StringTemplate also powers the ANTLR 3 and 4 code generator. Its distinguishing characteristic is that unlike other engines, it strictly enforces model-view separation. Strict separation makes websites and code generators more flexible and maintainable; it also provides an excellent defense against malicious template authors.

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/*
 * [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.*;
import java.lang.reflect.*;
import java.net.*;
import java.util.Iterator;

public class Misc {
    public static final String newline = System.getProperty("line.separator");

    // 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 newline from front but just one
    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 newline from end but just one
    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, file:/tmp/test.jar!/org/foo/templates/main.stg
	 *  convert to 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;
    }

	public static boolean urlExists(URL url) {
		try {
			URLConnection con = url.openConnection();
			InputStream is = con.getInputStream();
			is.close();
			return true;
		}
		catch (IOException ioe) {
			return false;
		}
	}

	/** Given index into string, 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);
    }

    public static Object accessField(Field f, Object o, Object value) throws IllegalAccessException {
        try {
            // make sure it's accessible (stupid java)
            f.setAccessible(true);
        }
        catch (SecurityException se) {
            ; // oh well; security won't let us
        }
        value = f.get(o);
        return value;
    }

    public static Object invokeMethod(Method m, Object o, Object value) throws IllegalAccessException, InvocationTargetException {
        try {
            // make sure it's accessible (stupid java)
            m.setAccessible(true);
        }
        catch (SecurityException se) {
            ; // oh well; security won't let us
        }
        value = m.invoke(o,(Object[])null);
        return value;
    }

    public static Method getMethod(Class c, String methodName) {
        Method m;
        try {
            m = c.getMethod(methodName, (Class[])null);
        }
        catch (NoSuchMethodException nsme) {
            m = null;
        }
        return m;
    }
}