// Copyright 2011 Google Inc. All Rights Reserved.
// Author: sreeni@google.com (Sreeni Viswanadha)

/* Copyright (c) 2006, Sun Microsystems, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of the Sun Microsystems, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR 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.
 */
package org.javacc.parser;

import java.util.List;
import java.util.Set;

import org.javacc.utils.OptionInfo;
import org.javacc.utils.OptionType;

/**
 * Entry point.
 */
public final class Main {
  private Main() {}

  public static LexGen lg;
  static void help_message() {
	  
	  
    System.out.println("Usage:");
    System.out.println("    javacc option-settings inputfile");
    System.out.println("");
    System.out.println("\"option-settings\" is a sequence of settings separated by spaces.");
    System.out.println("Each option setting must be of one of the following forms:");
    System.out.println("");
    System.out.println("    -optionname=value (e.g., -STATIC=false)");
    System.out.println("    -optionname:value (e.g., -STATIC:false)");
    System.out.println("    -optionname       (equivalent to -optionname=true.  e.g., -STATIC)");
    System.out.println("    -NOoptionname     (equivalent to -optionname=false. e.g., -NOSTATIC)");
    System.out.println("");
    System.out.println("Option settings are not case-sensitive, so one can say \"-nOsTaTiC\" instead");
    System.out.println("of \"-NOSTATIC\".  Option values must be appropriate for the corresponding");
    System.out.println("option, and must be either an integer, a boolean, or a string value.");
    System.out.println("");
    
    // 2013/07/23 -- Changed this to auto-generate from metadata in Options so that help is always in-sync with codebase
    printOptions();
    
    System.out.println("EXAMPLE:");
    System.out.println("    javacc -STATIC=false -LOOKAHEAD:2 -debug_parser mygrammar.jj");
    System.out.println("");
  }

private static void printOptions() {
	
	Set<OptionInfo> options = Options.getUserOptions();
    
    int maxLengthInt = 0;
    int maxLengthBool = 0;
    int maxLengthString = 0;
    
    for (OptionInfo i : options) {
    	int length = i.getName().length();
    	
    	if (i.getType() == OptionType.INTEGER) {
			maxLengthInt = length > maxLengthInt ? length : maxLengthInt;
    	} else if (i.getType() == OptionType.BOOLEAN) {
    		maxLengthBool = length > maxLengthBool ? length : maxLengthBool;
    		
    	} else if (i.getType() == OptionType.STRING) {
    		maxLengthString = length > maxLengthString ? length : maxLengthString;
    		
    	} else {
    		// Not interested
    	}
    }
    
    if (maxLengthInt > 0) {
	    System.out.println("The integer valued options are:");
	    System.out.println("");
	    for (OptionInfo i : options) {
	    	printOptionInfo(OptionType.INTEGER, i, maxLengthInt);
	    }
	    System.out.println("");
    }
    
    
    if (maxLengthBool > 0) {
	    System.out.println("The boolean valued options are:");
	    System.out.println("");
	    for (OptionInfo i : options) {
	    	printOptionInfo(OptionType.BOOLEAN, i, maxLengthBool);
	    }
	    System.out.println("");
    }
    
    if (maxLengthString > 0) {
	    System.out.println("The string valued options are:");
	    System.out.println("");
	    for (OptionInfo i : options) {
	    	printOptionInfo(OptionType.STRING, i, maxLengthString);
	    }
	    System.out.println("");
    }
}

private static void printOptionInfo(OptionType filter, OptionInfo optionInfo, int padLength) {
	if (optionInfo.getType() == filter) {
		Object default1 = optionInfo.getDefault();
		System.out.println("    " + padRight(optionInfo.getName(), padLength+1) + (default1 == null ? "" : ("(default : " + (default1.toString().length() == 0 ? "<<empty>>" : default1) + ")")));
	}
}

  private static String padRight(String name, int maxLengthInt) {
	  int nameLength = name.length();
	  if (nameLength == maxLengthInt) {
		  return name;
	  } else {
		  int charsToPad = maxLengthInt - nameLength;
		  StringBuilder sb = new StringBuilder(charsToPad);
		  sb.append(name);
		  
		  for (int i=0; i < charsToPad; i++) {
			  sb.append(" ");
		  }
		  
		  return sb.toString();
	  }
}

/**
   * A main program that exercises the parser.
   */
  public static void main(String args[]) throws Exception {
    int errorcode = mainProgram(args);
    System.exit(errorcode);
  }

  /**
   * The method to call to exercise the parser from other Java programs.
   * It returns an error code.  See how the main program above uses
   * this method.
   */
  public static int mainProgram(String args[]) throws Exception {

    // Initialize all static state
    reInitAll();

    JavaCCGlobals.bannerLine("Parser Generator", "");

    JavaCCParser parser = null;
    if (args.length == 0) {
      System.out.println("");
      help_message();
      return 1;
    } else {
      System.out.println("(type \"javacc\" with no arguments for help)");
    }

    if (Options.isOption(args[args.length-1])) {
      System.out.println("Last argument \"" + args[args.length-1] + "\" is not a filename.");
      return 1;
    }
    for (int arg = 0; arg < args.length-1; arg++) {
      if (!Options.isOption(args[arg])) {
        System.out.println("Argument \"" + args[arg] + "\" must be an option setting.");
        return 1;
      }
      Options.setCmdLineOption(args[arg]);
    }


	

    try {
      java.io.File fp = new java.io.File(args[args.length-1]);
      if (!fp.exists()) {
         System.out.println("File " + args[args.length-1] + " not found.");
         return 1;
      }
      if (fp.isDirectory()) {
         System.out.println(args[args.length-1] + " is a directory. Please use a valid file name.");
         return 1;
      }
      parser = new JavaCCParser(new java.io.BufferedReader(new java.io.InputStreamReader(new java.io.FileInputStream(args[args.length-1]), Options.getGrammarEncoding())));
    } catch (SecurityException se) {
      System.out.println("Security violation while trying to open " + args[args.length-1]);
      return 1;
    } catch (java.io.FileNotFoundException e) {
      System.out.println("File " + args[args.length-1] + " not found.");
      return 1;
    }

    try {
      System.out.println("Reading from file " + args[args.length-1] + " . . .");
      JavaCCGlobals.fileName = JavaCCGlobals.origFileName = args[args.length-1];
      JavaCCGlobals.jjtreeGenerated = JavaCCGlobals.isGeneratedBy("JJTree", args[args.length-1]);
      JavaCCGlobals.toolNames = JavaCCGlobals.getToolNames(args[args.length-1]);
      parser.javacc_input();
      
      // 2012/05/02 - Moved this here as cannot evaluate output language
      // until the cc file has been processed. Was previously setting the 'lg' variable
      // to a lexer before the configuration override in the cc file had been read.
      String outputLanguage = Options.getOutputLanguage();
      // TODO :: CBA --  Require Unification of output language specific processing into a single Enum class
  	  boolean isJavaOutput = Options.isOutputLanguageJava();
  	  boolean isCPPOutput = outputLanguage.equals(Options.OUTPUT_LANGUAGE__CPP);
  	  
  	  // 2013/07/22 Java Modern is a 
  	  boolean isJavaModern = isJavaOutput && Options.getJavaTemplateType().equals(Options.JAVA_TEMPLATE_TYPE_MODERN);
  	  
  	  if (isJavaOutput) {
        lg = new LexGen();
      } else if (isCPPOutput) {
        lg = new LexGenCPP();
      } else {
      	return unhandledLanguageExit(outputLanguage);
      }
  	
      JavaCCGlobals.createOutputDir(Options.getOutputDirectory());

      if (Options.getUnicodeInput())
      {
         NfaState.unicodeWarningGiven = true;
         System.out.println("Note: UNICODE_INPUT option is specified. " +
              "Please make sure you create the parser/lexer using a Reader with the correct character encoding.");
      }

      Semanticize.start();
      boolean isBuildParser = Options.getBuildParser();
      
 	  // 2012/05/02 -- This is not the best way to add-in GWT support, really the code needs to turn supported languages into enumerations
	  // and have the enumerations describe the deltas between the outputs. The current approach means that per-langauge configuration is distributed
	  // and small changes between targets does not benefit from inheritance.
		if (isJavaOutput) {
			if (isBuildParser) {
				new ParseGen().start(isJavaModern);
			}
			
			// Must always create the lexer object even if not building a parser.
			new LexGen().start();
			
			Options.setStringOption(Options.NONUSER_OPTION__PARSER_NAME, JavaCCGlobals.cu_name);
			OtherFilesGen.start(isJavaModern);
		} else if (isCPPOutput) { // C++ for now
			if (isBuildParser) {
				new ParseGenCPP().start();
			}
			if (isBuildParser) {
				new LexGenCPP().start();
			}
			Options.setStringOption(Options.NONUSER_OPTION__PARSER_NAME, JavaCCGlobals.cu_name);
			OtherFilesGenCPP.start();
		} else {
			unhandledLanguageExit(outputLanguage);
		}
	  
	  

      if ((JavaCCErrors.get_error_count() == 0) && (isBuildParser || Options.getBuildTokenManager())) {
        if (JavaCCErrors.get_warning_count() == 0) {
        	if (isBuildParser) {
        		System.out.println("Parser generated successfully.");
        	}
        } else {
          System.out.println("Parser generated with 0 errors and "
                             + JavaCCErrors.get_warning_count() + " warnings.");
        }
        return 0;
      } else {
        System.out.println("Detected " + JavaCCErrors.get_error_count() + " errors and "
                           + JavaCCErrors.get_warning_count() + " warnings.");
        return (JavaCCErrors.get_error_count()==0)?0:1;
      }
    } catch (MetaParseException e) {
      System.out.println("Detected " + JavaCCErrors.get_error_count() + " errors and "
                         + JavaCCErrors.get_warning_count() + " warnings.");
      return 1;
    } catch (ParseException e) {
      System.out.println(e.toString());
      System.out.println("Detected " + (JavaCCErrors.get_error_count()+1) + " errors and "
                         + JavaCCErrors.get_warning_count() + " warnings.");
      return 1;
    }
  }

private static int unhandledLanguageExit(String outputLanguage) {
	System.out.println("Invalid '" + Options.USEROPTION__OUTPUT_LANGUAGE+ "' specified : " + outputLanguage);
	return 1;
}

   public static void reInitAll()
   {
      org.javacc.parser.Expansion.reInit();
      org.javacc.parser.JavaCCErrors.reInit();
      org.javacc.parser.JavaCCGlobals.reInit();
      Options.init();
      org.javacc.parser.JavaCCParserInternals.reInit();
      org.javacc.parser.RStringLiteral.reInit();
      org.javacc.parser.JavaFiles.reInit();
      org.javacc.parser.NfaState.reInit();
      org.javacc.parser.MatchInfo.reInit();
      org.javacc.parser.LookaheadWalk.reInit();
      org.javacc.parser.Semanticize.reInit();
      org.javacc.parser.OtherFilesGen.reInit();
      org.javacc.parser.LexGen.reInit();
   }

}
