parsegen.java

java 编译器java复杂编译器,可以编译java文件的类库

/*
 * Copyright © 2002 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * California 95054, U.S.A. All rights reserved.  Sun Microsystems, Inc. has
 * intellectual property rights relating to technology embodied in the product
 * that is described in this document. In particular, and without limitation,
 * these intellectual property rights may include one or more of the U.S.
 * patents listed at http://www.sun.com/patents and one or more additional
 * patents or pending patent applications in the U.S. and in other countries.
 * U.S. Government Rights - Commercial software. Government users are subject
 * to the Sun Microsystems, Inc. standard license agreement and applicable
 * provisions of the FAR and its supplements.  Use is subject to license terms.
 * Sun,  Sun Microsystems,  the Sun logo and  Java are trademarks or registered
 * trademarks of Sun Microsystems, Inc. in the U.S. and other countries.  This
 * product is covered and controlled by U.S. Export Control laws and may be
 * subject to the export or import laws in other countries.  Nuclear, missile,
 * chemical biological weapons or nuclear maritime end uses or end users,
 * whether direct or indirect, are strictly prohibited.  Export or reexport
 * to countries subject to U.S. embargo or to entities identified on U.S.
 * export exclusion lists, including, but not limited to, the denied persons
 * and specially designated nationals lists is strictly prohibited.
 */

package org.javacc.parser;

import java.util.*;
import java.io.*;

public class ParseGen extends JavaCCGlobals implements JavaCCParserConstants {

  static public void start() throws MetaParseException {

    Token t = null;

    if (JavaCCErrors.get_error_count() != 0) throw new MetaParseException();

    if (Options.B("BUILD_PARSER")) {

      try {
        ostr = new PrintWriter(
                  new BufferedWriter(
                     new FileWriter(
                       new File(outputDir, cu_name + ".java")
                     ),
                     8192
                  )
               );
      } catch (IOException e) {
        JavaCCErrors.semantic_error("Could not open file " + cu_name + ".java for writing.");
        throw new Error();
      }

      Vector tn = (Vector)(toolNames.clone());
      tn.addElement(toolName);
      ostr.println("/* " + getIdString(tn, cu_name + ".java") + " */");

      boolean implementsExists = false;

      if (cu_to_insertion_point_1.size() != 0) {
        printTokenSetup((Token)(cu_to_insertion_point_1.elementAt(0))); ccol = 1;
        for (Enumeration enum = cu_to_insertion_point_1.elements(); enum.hasMoreElements();) {
          t = (Token)enum.nextElement();
          if (t.kind == IMPLEMENTS) {
            implementsExists = true;
          } else if (t.kind == CLASS) {
            implementsExists = false;
          }
          printToken(t, ostr);
        }
      }
      if (implementsExists) {
        ostr.print(", ");
      } else {
        ostr.print(" implements ");
      }
      ostr.print(cu_name + "Constants ");
      if (cu_to_insertion_point_2.size() != 0) {
        printTokenSetup((Token)(cu_to_insertion_point_2.elementAt(0)));
        for (Enumeration enum = cu_to_insertion_point_2.elements(); enum.hasMoreElements();) {
          t = (Token)enum.nextElement();
          printToken(t, ostr);
        }
      }

      ostr.println("");
      ostr.println("");

      ParseEngine.build(ostr);

      if (Options.B("STATIC")) {
        ostr.println("  static private boolean jj_initialized_once = false;");
      }
      if (Options.B("USER_TOKEN_MANAGER")) {
        ostr.println("  " + staticOpt() + "public TokenManager token_source;");
      } else {
        ostr.println("  " + staticOpt() + "public " + cu_name + "TokenManager token_source;");
	if (!Options.B("USER_CHAR_STREAM")) {
	  if (Options.B("JAVA_UNICODE_ESCAPE")) {
	    ostr.println("  " + staticOpt() + "JavaCharStream jj_input_stream;");
	  } else {
	    ostr.println("  " + staticOpt() + "SimpleCharStream jj_input_stream;");
	  }
	}
      }
      ostr.println("  " + staticOpt() + "public Token token, jj_nt;");
      if (!Options.B("CACHE_TOKENS")) {
	ostr.println("  " + staticOpt() + "private int jj_ntk;");
      }
      if (jj2index != 0) {
        ostr.println("  " + staticOpt() + "private Token jj_scanpos, jj_lastpos;");
        ostr.println("  " + staticOpt() + "private int jj_la;");
        ostr.println("  " + staticOpt() + "public boolean lookingAhead = false;");
        ostr.println("  " + staticOpt() + "private boolean jj_semLA;");
      }
      if (Options.B("ERROR_REPORTING")) {
        ostr.println("  " + staticOpt() + "private int jj_gen;");
        ostr.println("  " + staticOpt() + "final private int[] jj_la1 = new int[" + maskindex + "];");
	int tokenMaskSize = (tokenCount-1)/32 + 1;
	for (int i = 0; i < tokenMaskSize; i++) 
	  ostr.println("  static private int[] jj_la1_" + i + ";");
	ostr.println("  static {");
	for (int i = 0; i < tokenMaskSize; i++) 
	  ostr.println("      jj_la1_" + i + "();");
	ostr.println("   }");
	for (int i = 0; i < tokenMaskSize; i++) {
	  ostr.println("   private static void jj_la1_" + i + "() {");
	  ostr.print("      jj_la1_" + i + " = new int[] {");
	  for (Enumeration enum = maskVals.elements(); enum.hasMoreElements();) {
	    int[] tokenMask = (int[])(enum.nextElement());
	    ostr.print("0x" + Integer.toHexString(tokenMask[i]) + ",");
	  }
	  ostr.println("};");
	  ostr.println("   }");
	}
      }
      if (jj2index != 0 && Options.B("ERROR_REPORTING")) {
        ostr.println("  " + staticOpt() + "final private JJCalls[] jj_2_rtns = new JJCalls[" + jj2index + "];");
        ostr.println("  " + staticOpt() + "private boolean jj_rescan = false;");
        ostr.println("  " + staticOpt() + "private int jj_gc = 0;");
      }
      ostr.println("");

      if (!Options.B("USER_TOKEN_MANAGER")) {
        if (Options.B("USER_CHAR_STREAM")) {
          ostr.println("  public " + cu_name + "(CharStream stream) {");
          if (Options.B("STATIC")) {
            ostr.println("    if (jj_initialized_once) {");
            ostr.println("      System.out.println(\"ERROR: Second call to constructor of static parser.  You must\");");
            ostr.println("      System.out.println(\"       either use ReInit() or set the JavaCC option STATIC to false\");");
            ostr.println("      System.out.println(\"       during parser generation.\");");
            ostr.println("      throw new Error();");
            ostr.println("    }");
            ostr.println("    jj_initialized_once = true;");
          }
          ostr.println("    token_source = new " + cu_name + "TokenManager(stream);");
          ostr.println("    token = new Token();");
	  if (Options.B("CACHE_TOKENS")) {
	    ostr.println("    token.next = jj_nt = token_source.getNextToken();");
	  } else {
	    ostr.println("    jj_ntk = -1;");
	  }
          if (Options.B("ERROR_REPORTING")) {
            ostr.println("    jj_gen = 0;");
            ostr.println("    for (int i = 0; i < " + maskindex + "; i++) jj_la1[i] = -1;");
            if (jj2index != 0) {
              ostr.println("    for (int i = 0; i < jj_2_rtns.length; i++) jj_2_rtns[i] = new JJCalls();");
            }
          }
          ostr.println("  }");
          ostr.println("");
          ostr.println("  " + staticOpt() + "public void ReInit(CharStream stream) {");
          ostr.println("    token_source.ReInit(stream);");
          ostr.println("    token = new Token();");
	  if (Options.B("CACHE_TOKENS")) {
	    ostr.println("    token.next = jj_nt = token_source.getNextToken();");
	  } else {
	    ostr.println("    jj_ntk = -1;");
	  }
          if (jjtreeGenerated) {
            ostr.println("    jjtree.reset();");
          }
          if (Options.B("ERROR_REPORTING")) {
            ostr.println("    jj_gen = 0;");
            ostr.println("    for (int i = 0; i < " + maskindex + "; i++) jj_la1[i] = -1;");
            if (jj2index != 0) {
              ostr.println("    for (int i = 0; i < jj_2_rtns.length; i++) jj_2_rtns[i] = new JJCalls();");
            }
          }
          ostr.println("  }");
        } else {
          ostr.println("  public " + cu_name + "(java.io.InputStream stream) {");
          if (Options.B("STATIC")) {
            ostr.println("    if (jj_initialized_once) {");
            ostr.println("      System.out.println(\"ERROR: Second call to constructor of static parser.  You must\");");
            ostr.println("      System.out.println(\"       either use ReInit() or set the JavaCC option STATIC to false\");");
            ostr.println("      System.out.println(\"       during parser generation.\");");
            ostr.println("      throw new Error();");
            ostr.println("    }");
            ostr.println("    jj_initialized_once = true;");
          }
          if (Options.B("JAVA_UNICODE_ESCAPE")) {
            ostr.println("    jj_input_stream = new JavaCharStream(stream, 1, 1);");
          } else {
            ostr.println("    jj_input_stream = new SimpleCharStream(stream, 1, 1);");
          }
          ostr.println("    token_source = new " + cu_name + "TokenManager(jj_input_stream);");
          ostr.println("    token = new Token();");
	  if (Options.B("CACHE_TOKENS")) {
	    ostr.println("    token.next = jj_nt = token_source.getNextToken();");
	  } else {
	    ostr.println("    jj_ntk = -1;");
	  }
          if (Options.B("ERROR_REPORTING")) {
            ostr.println("    jj_gen = 0;");
            ostr.println("    for (int i = 0; i < " + maskindex + "; i++) jj_la1[i] = -1;");
            if (jj2index != 0) {
              ostr.println("    for (int i = 0; i < jj_2_rtns.length; i++) jj_2_rtns[i] = new JJCalls();");
            }
          }
          ostr.println("  }");
          ostr.println("");
          ostr.println("  " + staticOpt() + "public void ReInit(java.io.InputStream stream) {");
          if (Options.B("JAVA_UNICODE_ESCAPE")) {
            ostr.println("    jj_input_stream.ReInit(stream, 1, 1);");
          } else {
            ostr.println("    jj_input_stream.ReInit(stream, 1, 1);");
          }
          ostr.println("    token_source.ReInit(jj_input_stream);");
          ostr.println("    token = new Token();");
	  if (Options.B("CACHE_TOKENS")) {
	    ostr.println("    token.next = jj_nt = token_source.getNextToken();");
	  } else {