jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/util/DiagnosticSource.java@7375d4979bd3 (annotated)

src/share/classes/com/sun/tools/javac/util/DiagnosticSource.java@7375d4979bd3 (annotated)

src/share/classes/com/sun/tools/javac/util/DiagnosticSource.java

Mon, 14 Nov 2011 15:11:10 -0800

author: ksrini
date: Mon, 14 Nov 2011 15:11:10 -0800
changeset 1138: 7375d4979bd3
parent 581: f2fdd52e4e87
child 1280: 5c0b3faeb0b0
permissions: -rw-r--r--

7106166: (javac) re-factor EndPos parser
Reviewed-by: jjg

 /*
  * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
 package com.sun.tools.javac.util;
 import java.io.IOException;
 import java.lang.ref.SoftReference;
 import java.nio.CharBuffer;
 import java.util.Map;
 import javax.tools.JavaFileObject;
 import com.sun.tools.javac.file.JavacFileManager;
 import com.sun.tools.javac.parser.EndPosTable;
 import com.sun.tools.javac.tree.JCTree;
 import static com.sun.tools.javac.util.LayoutCharacters.*;
 /**
  * A simple abstraction of a source file, as needed for use in a diagnostic message.
  * Provides access to the line and position in a line for any given character offset.
  *
  *  <p><b>This is NOT part of any supported API.
  *  If you write code that depends on this, you do so at your own risk.
  *  This code and its internal interfaces are subject to change or
  *  deletion without notice.</b>
  */
 public class DiagnosticSource {
     /* constant DiagnosticSource to be used when sourcefile is missing */
     public static final DiagnosticSource NO_SOURCE = new DiagnosticSource() {
         @Override
         protected boolean findLine(int pos) {
             return false;
         }
     };
     public DiagnosticSource(JavaFileObject fo, AbstractLog log) {
         this.fileObject = fo;
         this.log = log;
     }
     private DiagnosticSource() {}
     /** Return the underlying file object handled by this
      *  DiagnosticSource object.
      */
     public JavaFileObject getFile() {
         return fileObject;
     }
     /** Return the one-based line number associated with a given pos
      * for the current source file.  Zero is returned if no line exists
      * for the given position.
      */
     public int getLineNumber(int pos) {
         try {
             if (findLine(pos)) {
                 return line;
             }
             return 0;
         } finally {
             buf = null;
         }
     }
     /** Return the one-based column number associated with a given pos
      * for the current source file.  Zero is returned if no column exists
      * for the given position.
      */
     public int getColumnNumber(int pos, boolean expandTabs) {
         try {
             if (findLine(pos)) {
                 int column = 0;
                 for (int bp = lineStart; bp < pos; bp++) {
                     if (bp >= bufLen) {
                         return 0;
                     }
                     if (buf[bp] == '\t' && expandTabs) {
                         column = (column / TabInc * TabInc) + TabInc;
                     } else {
                         column++;
                     }
                 }
                 return column + 1; // positions are one-based
             }
             return 0;
         } finally {
             buf = null;
         }
     }
     /** Return the content of the line containing a given pos.
      */
     public String getLine(int pos) {
         try {
             if (!findLine(pos))
                 return null;
             int lineEnd = lineStart;
             while (lineEnd < bufLen && buf[lineEnd] != CR && buf[lineEnd] != LF)
                 lineEnd++;
             if (lineEnd - lineStart == 0)
                 return null;
             return new String(buf, lineStart, lineEnd - lineStart);
         } finally {
             buf = null;
         }
     }
     public EndPosTable getEndPosTable() {
         return endPosTable;
     }
     public void setEndPosTable(EndPosTable t) {
         if (endPosTable != null && endPosTable != t)
             throw new IllegalStateException("endPosTable already set");
         endPosTable = t;
     }
     /** Find the line in the buffer that contains the current position
      * @param pos      Character offset into the buffer
      */
     protected boolean findLine(int pos) {
         if (pos == Position.NOPOS)
             return false;
         try {
             // try and recover buffer from soft reference cache
             if (buf == null && refBuf != null)
                 buf = refBuf.get();
             if (buf == null) {
                 buf = initBuf(fileObject);
                 lineStart = 0;
                 line = 1;
             } else if (lineStart > pos) { // messages don't come in order
                 lineStart = 0;
                 line = 1;
             }
             int bp = lineStart;
             while (bp < bufLen && bp < pos) {
                 switch (buf[bp++]) {
                 case CR:
                     if (bp < bufLen && buf[bp] == LF) bp++;
                     line++;
                     lineStart = bp;
                     break;
                 case LF:
                     line++;
                     lineStart = bp;
                     break;
                 }
             }
             return bp <= bufLen;
         } catch (IOException e) {
             log.directError("source.unavailable");
             buf = new char[0];
             return false;
         }
     }
     protected char[] initBuf(JavaFileObject fileObject) throws IOException {
         char[] buf;
         CharSequence cs = fileObject.getCharContent(true);
         if (cs instanceof CharBuffer) {
             CharBuffer cb = (CharBuffer) cs;
             buf = JavacFileManager.toArray(cb);
             bufLen = cb.limit();
         } else {
             buf = cs.toString().toCharArray();
             bufLen = buf.length;
         }
         refBuf = new SoftReference<char[]>(buf);
         return buf;
     }
     /** The underlying file object. */
     protected JavaFileObject fileObject;
     protected EndPosTable endPosTable;
     /** A soft reference to the content of the file object. */
     protected SoftReference<char[]> refBuf;
     /** A temporary hard reference to the content of the file object. */
     protected char[] buf;
     /** The length of the content. */
     protected int bufLen;
     /** The start of a line found by findLine. */
     protected int lineStart;
     /** The line number of a line found by findLine. */
     protected int line;
     /** A log for reporting errors, such as errors accessing the content. */
     protected AbstractLog log;
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/javac/util/DiagnosticSource.java@7375d4979bd3 (annotated)

src/share/classes/com/sun/tools/javac/util/DiagnosticSource.java