javafiles.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.io.*;

public class JavaFiles
    extends JavaCCGlobals
    implements JavaCCParserConstants
{

  static PrintWriter ostr;

  /**
   * ID of the latest version (of JavaCC) in which one of the CharStream classes
   * or the CharStream interface is modified.
   */
  static final String charStreamVersion = "3.0";

  /**
   * ID of the latest version (of JavaCC) in which the TokenManager interface is modified.
   */
  static final String tokenManagerVersion = "3.0";

  /**
   * ID of the latest version (of JavaCC) in which the Token class is modified.
   */
  static final String tokenVersion = "3.0";

  /**
   * ID of the latest version (of JavaCC) in which the ParseException class is
   * modified.
   */
  static final String parseExceptionVersion = "3.0";

  /**
   * ID of the latest version (of JavaCC) in which the TokenMgrError class is
   * modified.
   */
  static final String tokenMgrErrorVersion = "3.0";

  /**
   * Replaces all backslahes with double backslashes.
   */
  static String replaceBackslash(String str)
  {
     StringBuffer b;
     int i = 0, len = str.length();

     while (i < len && str.charAt(i++) != '\\') ;

     if (i == len)  // No backslash found.
       return str;

     char c;
     b = new StringBuffer();
     for (i = 0; i < len; i++)
       if ((c = str.charAt(i)) == '\\')
          b.append("\\\\");
       else
          b.append(c);

     return b.toString();
  }

  static void CheckVersion(String fileName, String versionId)
  {
     fileName = replaceBackslash(fileName);
     String firstLine = "/* " + getIdString(toolName, fileName) +
                                         " Version " + versionId + " */";
     char[] buf = new char[firstLine.length()];

     try {
       File fp = new File(outputDir, fileName);
       Reader stream = new FileReader(fp);
       int read, total = 0;

       for (;;)
          if ((read = stream.read(buf, 0, buf.length)) > 0)
          {
             if ((total += read) == buf.length)
                if (new String(buf).equals(firstLine))
                   return;
                else
                   break;
          }
          else
             break;
    } catch(FileNotFoundException e1) {
      // This should never happen
      JavaCCErrors.semantic_error("Could not open file " + fileName + " for writing.");
      throw new Error();
    } catch(IOException e2) {
    }

    JavaCCErrors.warning(fileName + ": File is obsolete.  Please rename or delete this file so" +
                       " that a new one can be generated for you.");
    return;
  }

  public static void gen_JavaCharStream() {
    File tmp = null;
    if ((tmp = new File(outputDir, "JavaCharStream.java")).exists()) {
      CheckVersion("JavaCharStream.java", charStreamVersion);
      return;
    }
    System.out.println("File \"JavaCharStream.java\" does not exist.  Will create one.");
    try {
      ostr = new PrintWriter(
                new BufferedWriter(
                   new FileWriter(tmp),
                   8192
                )
             );
    } catch (IOException e) {
      JavaCCErrors.semantic_error("Could not open file JavaCharStream.java for writing.");
      throw new Error();
    }

    ostr.println("/* " + getIdString(toolName, "JavaCharStream.java") + " Version " + charStreamVersion + " */");

    if (cu_to_insertion_point_1.size() != 0 &&
        ((Token)cu_to_insertion_point_1.elementAt(0)).kind == PACKAGE
       ) {
      for (int i = 1; i < cu_to_insertion_point_1.size(); i++) {
        if (((Token)cu_to_insertion_point_1.elementAt(i)).kind == SEMICOLON) {
          cline = ((Token)(cu_to_insertion_point_1.elementAt(0))).beginLine;
          ccol = ((Token)(cu_to_insertion_point_1.elementAt(0))).beginColumn;
          for (int j = 0; j <= i; j++) {
            printToken((Token)(cu_to_insertion_point_1.elementAt(j)), ostr);
          }
          ostr.println("");
          ostr.println("");
          break;
        }
      }
    }
    String prefix = (Options.B("STATIC") ? "  static " : "  ");
    ostr.println("/**");
    ostr.println(" * An implementation of interface CharStream, where the stream is assumed to");
    ostr.println(" * contain only ASCII characters (with java-like unicode escape processing).");
    ostr.println(" */");
    ostr.println("");
    ostr.println("public class JavaCharStream");
    ostr.println("{");
    ostr.println("  public static final boolean staticFlag = " +
                                         Options.B("STATIC") + ";");
    ostr.println("  static final int hexval(char c) throws java.io.IOException {");
    ostr.println("    switch(c)");
    ostr.println("    {");
    ostr.println("       case '0' :");
    ostr.println("          return 0;");
    ostr.println("       case '1' :");
    ostr.println("          return 1;");
    ostr.println("       case '2' :");
    ostr.println("          return 2;");
    ostr.println("       case '3' :");
    ostr.println("          return 3;");
    ostr.println("       case '4' :");
    ostr.println("          return 4;");
    ostr.println("       case '5' :");
    ostr.println("          return 5;");
    ostr.println("       case '6' :");
    ostr.println("          return 6;");
    ostr.println("       case '7' :");
    ostr.println("          return 7;");
    ostr.println("       case '8' :");
    ostr.println("          return 8;");
    ostr.println("       case '9' :");
    ostr.println("          return 9;");
    ostr.println("");
    ostr.println("       case 'a' :");
    ostr.println("       case 'A' :");
    ostr.println("          return 10;");
    ostr.println("       case 'b' :");
    ostr.println("       case 'B' :");
    ostr.println("          return 11;");
    ostr.println("       case 'c' :");
    ostr.println("       case 'C' :");
    ostr.println("          return 12;");
    ostr.println("       case 'd' :");
    ostr.println("       case 'D' :");
    ostr.println("          return 13;");
    ostr.println("       case 'e' :");
    ostr.println("       case 'E' :");
    ostr.println("          return 14;");
    ostr.println("       case 'f' :");
    ostr.println("       case 'F' :");
    ostr.println("          return 15;");
    ostr.println("    }");
    ostr.println("");
    ostr.println("    throw new java.io.IOException(); // Should never come here");
    ostr.println("  }");
    ostr.println("");
    ostr.println(prefix + "public int bufpos = -1;");
    ostr.println(prefix + "int bufsize;");
    ostr.println(prefix + "int available;");
    ostr.println(prefix + "int tokenBegin;");

    if (OtherFilesGen.keepLineCol)
    {
       ostr.println(prefix + "protected int bufline[];");
       ostr.println(prefix + "protected int bufcolumn[];");
       ostr.println("");
       ostr.println(prefix + "protected int column = 0;");
       ostr.println(prefix + "protected int line = 1;");
       ostr.println("");
       ostr.println(prefix + "protected boolean prevCharIsCR = false;");
       ostr.println(prefix + "protected boolean prevCharIsLF = false;");
    }

    ostr.println("");
    ostr.println(prefix + "protected java.io.Reader inputStream;");
    ostr.println("");
    ostr.println(prefix + "protected char[] nextCharBuf;");
    ostr.println(prefix + "protected char[] buffer;");
    ostr.println(prefix + "protected int maxNextCharInd = 0;");
    ostr.println(prefix + "protected int nextCharInd = -1;");
    ostr.println(prefix + "protected int inBuf = 0;");
    ostr.println("");
    ostr.println(prefix + "protected void ExpandBuff(boolean wrapAround)");
    ostr.println("  {");
    ostr.println("     char[] newbuffer = new char[bufsize + 2048];");

    if (OtherFilesGen.keepLineCol)
    {
       ostr.println("     int newbufline[] = new int[bufsize + 2048];");
       ostr.println("     int newbufcolumn[] = new int[bufsize + 2048];");
    }

    ostr.println("");
    ostr.println("     try");
    ostr.println("     {");
    ostr.println("        if (wrapAround)");
    ostr.println("        {");
    ostr.println("           System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);");
    ostr.println("           System.arraycopy(buffer, 0, newbuffer,");
    ostr.println("                                             bufsize - tokenBegin, bufpos);");
    ostr.println("           buffer = newbuffer;");

    if (OtherFilesGen.keepLineCol)
    {
       ostr.println("");
       ostr.println("           System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);");
       ostr.println("           System.arraycopy(bufline, 0, newbufline, bufsize - tokenBegin, bufpos);");
       ostr.println("           bufline = newbufline;");
       ostr.println("");
       ostr.println("           System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);");
       ostr.println("           System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize - tokenBegin, bufpos);");
       ostr.println("           bufcolumn = newbufcolumn;");
    }

    ostr.println("");
    ostr.println("           bufpos += (bufsize - tokenBegin);");
    ostr.println("        }");
    ostr.println("        else");
    ostr.println("        {");
    ostr.println("           System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);");
    ostr.println("           buffer = newbuffer;");

    if (OtherFilesGen.keepLineCol)
    {
       ostr.println("");
       ostr.println("           System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);");
       ostr.println("           bufline = newbufline;");
       ostr.println("");
       ostr.println("           System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);");
       ostr.println("           bufcolumn = newbufcolumn;");
    }

    ostr.println("");
    ostr.println("           bufpos -= tokenBegin;");
    ostr.println("        }");
    ostr.println("     }");
    ostr.println("     catch (Throwable t)");
    ostr.println("     {");
    ostr.println("        throw new Error(t.getMessage());");
    ostr.println("     }");
    ostr.println("");
    ostr.println("     available = (bufsize += 2048);");
    ostr.println("     tokenBegin = 0;");
    ostr.println("  }");
    ostr.println("");
    ostr.println(prefix + "protected void FillBuff() throws java.io.IOException");
    ostr.println("  {");
    ostr.println("     int i;");
    ostr.println("     if (maxNextCharInd == 4096)");
    ostr.println("        maxNextCharInd = nextCharInd = 0;");
    ostr.println("");
    ostr.println("     try {");
    ostr.println("        if ((i = inputStream.read(nextCharBuf, maxNextCharInd,");
    ostr.println("                                            4096 - maxNextCharInd)) == -1)");
    ostr.println("        {");
    ostr.println("           inputStream.close();");
    ostr.println("           throw new java.io.IOException();");
    ostr.println("        }");
    ostr.println("        else");
    ostr.println("           maxNextCharInd += i;");
    ostr.println("        return;");
    ostr.println("     }");
    ostr.println("     catch(java.io.IOException e) {");
    ostr.println("        if (bufpos != 0)");
    ostr.println("        {");
    ostr.println("           --bufpos;");
    ostr.println("           backup(0);");
    ostr.println("        }");

    if (OtherFilesGen.keepLineCol)
    {
       ostr.println("        else");
       ostr.println("        {");
       ostr.println("           bufline[bufpos] = line;");
       ostr.println("           bufcolumn[bufpos] = column;");
       ostr.println("        }");
    }

    ostr.println("        throw e;");