| /* |
| * Copyright 2004-2006 Sun Microsystems, Inc. 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. Sun designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| package com.sun.tools.javac.parser; |
| |
| import java.io.*; |
| 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 API supported by Sun Microsystems. 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 { |
| |
| /** A factory for creating scanners. */ |
| public static class Factory extends Scanner.Factory { |
| |
| public static void preRegister(final Context context) { |
| context.put(scannerFactoryKey, new Context.Factory<Scanner.Factory>() { |
| public Factory make() { |
| return new Factory(context); |
| } |
| }); |
| } |
| |
| /** Create a new scanner factory. */ |
| protected Factory(Context context) { |
| super(context); |
| } |
| |
| @Override |
| public Scanner newScanner(CharSequence input) { |
| if (input instanceof CharBuffer) { |
| return new DocCommentScanner(this, (CharBuffer)input); |
| } else { |
| char[] array = input.toString().toCharArray(); |
| return newScanner(array, array.length); |
| } |
| } |
| |
| @Override |
| public Scanner newScanner(char[] input, int inputLength) { |
| return new DocCommentScanner(this, input, inputLength); |
| } |
| } |
| |
| |
| /** Create a scanner from the input buffer. buffer must implement |
| * array() and compact(), and remaining() must be less than limit(). |
| */ |
| protected DocCommentScanner(Factory 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(Factory 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, |
| 0, 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); |
| } |
| } |