| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * Copyright 1999-2004 The Apache Software Foundation. |
| * |
| * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.sun.org.apache.regexp.internal; |
| |
| import com.sun.org.apache.regexp.internal.RECompiler; |
| import com.sun.org.apache.regexp.internal.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> |
| */ |
| 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()); |
| } |
| } |
| } |
| } |