package org.apache.regexp;
/*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. 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 end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Jakarta-Regexp", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
import org.apache.regexp.RECompiler;
import org.apache.regexp.RESyntaxException;
/**
* 'recompile' is a command line tool that pre-compiles one or more regular expressions
* for use with the regular expression matcher class 'RE'. For example, the command
* "java recompile a*b" produces output like this:
*
* <pre>
*
* // Pre-compiled regular expression "a*b"
* char[] re1Instructions =
* {
* 0x007c, 0x0000, 0x001a, 0x007c, 0x0000, 0x000d, 0x0041,
* 0x0001, 0x0004, 0x0061, 0x007c, 0x0000, 0x0003, 0x0047,
* 0x0000, 0xfff6, 0x007c, 0x0000, 0x0003, 0x004e, 0x0000,
* 0x0003, 0x0041, 0x0001, 0x0004, 0x0062, 0x0045, 0x0000,
* 0x0000,
* };
*
* REProgram re1 = new REProgram(re1Instructions);
*
* </pre>
*
* By pasting this output into your code, you can construct a regular expression matcher
* (RE) object directly from the pre-compiled data (the character array re1), thus avoiding
* the overhead of compiling the expression at runtime. For example:
*
* <pre>
*
* RE r = new RE(re1);
*
* </pre>
*
* @see RE
* @see RECompiler
*
* @author <a href="mailto:jonl@muppetlabs.com">Jonathan Locke</a>
* @version $Id: recompile.java,v 1.1 2004/04/10 00:17:47 guehene Exp $
*/
public class recompile
{
/**
* Main application entrypoint.
* @param arg Command line arguments
*/
static public void main(String[] arg)
{
// Create a compiler object
RECompiler r = new RECompiler();
// Print usage if arguments are incorrect
if (arg.length <= 0 || arg.length % 2 != 0)
{
System.out.println("Usage: recompile <patternname> <pattern>");
System.exit(0);
}
// Loop through arguments, compiling each
for (int i = 0; i < arg.length; i += 2)
{
try
{
// Compile regular expression
String name = arg[i];
String pattern = arg[i+1];
String instructions = name + "PatternInstructions";
// Output program as a nice, formatted character array
System.out.print("\n // Pre-compiled regular expression '" + pattern + "'\n"
+ " private static char[] " + instructions + " = \n {");
// Compile program for pattern
REProgram program = r.compile(pattern);
// Number of columns in output
int numColumns = 7;
// Loop through program
char[] p = program.getInstructions();
for (int j = 0; j < p.length; j++)
{
// End of column?
if ((j % numColumns) == 0)
{
System.out.print("\n ");
}
// Print character as padded hex number
String hex = Integer.toHexString(p[j]);
while (hex.length() < 4)
{
hex = "0" + hex;
}
System.out.print("0x" + hex + ", ");
}
// End of program block
System.out.println("\n };");
System.out.println("\n private static RE " + name + "Pattern = new RE(new REProgram(" + instructions + "));");
}
catch (RESyntaxException e)
{
System.out.println("Syntax error in expression \"" + arg[i] + "\": " + e.toString());
}
catch (Exception e)
{
System.out.println("Unexpected exception: " + e.toString());
}
catch (Error e)
{
System.out.println("Internal error: " + e.toString());
}
}
}
}