jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/parser/DocCommentScanner.java@4868a36f6fd8 (annotated)

src/share/classes/com/sun/tools/javac/parser/DocCommentScanner.java@4868a36f6fd8 (annotated)

src/share/classes/com/sun/tools/javac/parser/DocCommentScanner.java

Tue, 28 Dec 2010 15:54:52 -0800

author: ohair
date: Tue, 28 Dec 2010 15:54:52 -0800
changeset 798: 4868a36f6fd8
parent 695: 3c9b64e55c5d
permissions: -rw-r--r--

6962318: Update copyright year
Reviewed-by: xdono

 /*
  * Copyright (c) 2004, 2010, 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.parser;
 import java.nio.*;
 import com.sun.tools.javac.util.*;
 import static com.sun.tools.javac.util.LayoutCharacters.*;
 /** An extension to the base lexical analyzer that captures
  *  and processes the contents of doc comments.  It does so by
  *  translating Unicode escape sequences and by stripping the
  *  leading whitespace and starts from each line of the comment.
  *
  *  <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 DocCommentScanner extends Scanner {
     /** Create a scanner from the input buffer.  buffer must implement
      *  array() and compact(), and remaining() must be less than limit().
      */
     protected DocCommentScanner(ScannerFactory fac, CharBuffer buffer) {
         super(fac, buffer);
     }
     /** Create a scanner from the input array.  The array must have at
      *  least a single character of extra space.
      */
     protected DocCommentScanner(ScannerFactory fac, char[] input, int inputLength) {
         super(fac, input, inputLength);
     }
     /** Starting position of the comment in original source
      */
     private int pos;
     /** The comment input buffer, index of next chacter to be read,
      *  index of one past last character in buffer.
      */
     private char[] buf;
     private int bp;
     private int buflen;
     /** The current character.
      */
     private char ch;
     /** The column number position of the current character.
      */
     private int col;
     /** The buffer index of the last converted Unicode character
      */
     private int unicodeConversionBp = 0;
     /**
      * Buffer for doc comment.
      */
     private char[] docCommentBuffer = new char[1024];
     /**
      * Number of characters in doc comment buffer.
      */
     private int docCommentCount;
     /**
      * Translated and stripped contents of doc comment
      */
     private String docComment = null;
     /** Unconditionally expand the comment buffer.
      */
     private void expandCommentBuffer() {
         char[] newBuffer = new char[docCommentBuffer.length * 2];
         System.arraycopy(docCommentBuffer, 0, newBuffer,
 , docCommentBuffer.length);
         docCommentBuffer = newBuffer;
     }
     /** Convert an ASCII digit from its base (8, 10, or 16)
      *  to its value.
      */
     private int digit(int base) {
         char c = ch;
         int result = Character.digit(c, base);
         if (result >= 0 && c > 0x7f) {
             ch = "0123456789abcdef".charAt(result);
         }
         return result;
     }
     /** Convert Unicode escape; bp points to initial '\' character
      *  (Spec 3.3).
      */
     private void convertUnicode() {
         if (ch == '\\' && unicodeConversionBp != bp) {
             bp++; ch = buf[bp]; col++;
             if (ch == 'u') {
                 do {
                     bp++; ch = buf[bp]; col++;
                 } while (ch == 'u');
                 int limit = bp + 3;
                 if (limit < buflen) {
                     int d = digit(16);
                     int code = d;
                     while (bp < limit && d >= 0) {
                         bp++; ch = buf[bp]; col++;
                         d = digit(16);
                         code = (code << 4) + d;
                     }
                     if (d >= 0) {
                         ch = (char)code;
                         unicodeConversionBp = bp;
                         return;
                     }
                 }
                 // "illegal.Unicode.esc", reported by base scanner
             } else {
                 bp--;
                 ch = '\\';
                 col--;
             }
         }
     }
     /** Read next character.
      */
     private void scanChar() {
         bp++;
         ch = buf[bp];
         switch (ch) {
         case '\r': // return
             col = 0;
             break;
         case '\n': // newline
             if (bp == 0 || buf[bp-1] != '\r') {
                 col = 0;
             }
             break;
         case '\t': // tab
             col = (col / TabInc * TabInc) + TabInc;
             break;
         case '\\': // possible Unicode
             col++;
             convertUnicode();
             break;
         default:
             col++;
             break;
         }
     }
     /**
      * Read next character in doc comment, skipping over double '\' characters.
      * If a double '\' is skipped, put in the buffer and update buffer count.
      */
     private void scanDocCommentChar() {
         scanChar();
         if (ch == '\\') {
             if (buf[bp+1] == '\\' && unicodeConversionBp != bp) {
                 if (docCommentCount == docCommentBuffer.length)
                     expandCommentBuffer();
                 docCommentBuffer[docCommentCount++] = ch;
                 bp++; col++;
             } else {
                 convertUnicode();
             }
         }
     }
     /* Reset doc comment before reading each new token
      */
     public void nextToken() {
         docComment = null;
         super.nextToken();
     }
     /**
      * Returns the documentation string of the current token.
      */
     public String docComment() {
         return docComment;
     }
     /**
      * Process a doc comment and make the string content available.
      * Strips leading whitespace and stars.
      */
     @SuppressWarnings("fallthrough")
     protected void processComment(CommentStyle style) {
         if (style != CommentStyle.JAVADOC) {
             return;
         }
         pos = pos();
         buf = getRawCharacters(pos, endPos());
         buflen = buf.length;
         bp = 0;
         col = 0;
         docCommentCount = 0;
         boolean firstLine = true;
         // Skip over first slash
         scanDocCommentChar();
         // Skip over first star
         scanDocCommentChar();
         // consume any number of stars
         while (bp < buflen && ch == '*') {
             scanDocCommentChar();
         }
         // is the comment in the form /**/, /***/, /****/, etc. ?
         if (bp < buflen && ch == '/') {
             docComment = "";
             return;
         }
         // skip a newline on the first line of the comment.
         if (bp < buflen) {
             if (ch == LF) {
                 scanDocCommentChar();
                 firstLine = false;
             } else if (ch == CR) {
                 scanDocCommentChar();
                 if (ch == LF) {
                     scanDocCommentChar();
                     firstLine = false;
                 }
             }
         }
     outerLoop:
         // The outerLoop processes the doc comment, looping once
         // for each line.  For each line, it first strips off
         // whitespace, then it consumes any stars, then it
         // puts the rest of the line into our buffer.
         while (bp < buflen) {
             // The wsLoop consumes whitespace from the beginning
             // of each line.
         wsLoop:
             while (bp < buflen) {
                 switch(ch) {
                 case ' ':
                     scanDocCommentChar();
                     break;
                 case '\t':
                     col = ((col - 1) / TabInc * TabInc) + TabInc;
                     scanDocCommentChar();
                     break;
                 case FF:
                     col = 0;
                     scanDocCommentChar();
                     break;
 // Treat newline at beginning of line (blank line, no star)
 // as comment text.  Old Javadoc compatibility requires this.
 /*---------------------------------*
                 case CR: // (Spec 3.4)
                     scanDocCommentChar();
                     if (ch == LF) {
                         col = 0;
                         scanDocCommentChar();
                     }
                     break;
                 case LF: // (Spec 3.4)
                     scanDocCommentChar();
                     break;
 *---------------------------------*/
                 default:
                     // we've seen something that isn't whitespace;
                     // jump out.
                     break wsLoop;
                 }
             }
             // Are there stars here?  If so, consume them all
             // and check for the end of comment.
             if (ch == '*') {
                 // skip all of the stars
                 do {
                     scanDocCommentChar();
                 } while (ch == '*');
                 // check for the closing slash.
                 if (ch == '/') {
                     // We're done with the doc comment
                     // scanChar() and breakout.
                     break outerLoop;
                 }
             } else if (! firstLine) {
                 //The current line does not begin with a '*' so we will indent it.
                 for (int i = 1; i < col; i++) {
                     if (docCommentCount == docCommentBuffer.length)
                         expandCommentBuffer();
                     docCommentBuffer[docCommentCount++] = ' ';
                 }
             }
             // The textLoop processes the rest of the characters
             // on the line, adding them to our buffer.
         textLoop:
             while (bp < buflen) {
                 switch (ch) {
                 case '*':
                     // Is this just a star?  Or is this the
                     // end of a comment?
                     scanDocCommentChar();
                     if (ch == '/') {
                         // This is the end of the comment,
                         // set ch and return our buffer.
                         break outerLoop;
                     }
                     // This is just an ordinary star.  Add it to
                     // the buffer.
                     if (docCommentCount == docCommentBuffer.length)
                         expandCommentBuffer();
                     docCommentBuffer[docCommentCount++] = '*';
                     break;
                 case ' ':
                 case '\t':
                     if (docCommentCount == docCommentBuffer.length)
                         expandCommentBuffer();
                     docCommentBuffer[docCommentCount++] = ch;
                     scanDocCommentChar();
                     break;
                 case FF:
                     scanDocCommentChar();
                     break textLoop; // treat as end of line
                 case CR: // (Spec 3.4)
                     scanDocCommentChar();
                     if (ch != LF) {
                         // Canonicalize CR-only line terminator to LF
                         if (docCommentCount == docCommentBuffer.length)
                             expandCommentBuffer();
                         docCommentBuffer[docCommentCount++] = (char)LF;
                         break textLoop;
                     }
                     /* fall through to LF case */
                 case LF: // (Spec 3.4)
                     // We've seen a newline.  Add it to our
                     // buffer and break out of this loop,
                     // starting fresh on a new line.
                     if (docCommentCount == docCommentBuffer.length)
                         expandCommentBuffer();
                     docCommentBuffer[docCommentCount++] = ch;
                     scanDocCommentChar();
                     break textLoop;
                 default:
                     // Add the character to our buffer.
                     if (docCommentCount == docCommentBuffer.length)
                         expandCommentBuffer();
                     docCommentBuffer[docCommentCount++] = ch;
                     scanDocCommentChar();
                 }
             } // end textLoop
             firstLine = false;
         } // end outerLoop
         if (docCommentCount > 0) {
             int i = docCommentCount - 1;
         trailLoop:
             while (i > -1) {
                 switch (docCommentBuffer[i]) {
                 case '*':
                     i--;
                     break;
                 default:
                     break trailLoop;
                 }
             }
             docCommentCount = i + 1;
             // Store the text of the doc comment
             docComment = new String(docCommentBuffer, 0 , docCommentCount);
         } else {
             docComment = "";
         }
     }
     /** Build a map for translating between line numbers and
      * positions in the input.
      *
      * @return a LineMap */
     public Position.LineMap getLineMap() {
         char[] buf = getRawCharacters();
         return Position.makeLineMap(buf, buf.length, true);
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/javac/parser/DocCommentScanner.java@4868a36f6fd8 (annotated)

src/share/classes/com/sun/tools/javac/parser/DocCommentScanner.java