jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/parser/JavaTokenizer.java@75c936d14c6a (annotated)

src/share/classes/com/sun/tools/javac/parser/JavaTokenizer.java@75c936d14c6a (annotated)

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

Thu, 01 Nov 2012 12:47:11 +0000

author: vromero
date: Thu, 01 Nov 2012 12:47:11 +0000
changeset 1385: 75c936d14c6a
parent 1358: fc123bdeddb8
child 1431: 1f41a5758cf7
permissions: -rw-r--r--

8000483: cryptic error message when source file contains hash
Summary: cryptic error message when source file contains hash
Reviewed-by: jjg, mcimadamore
Contributed-by: vicente.romero@oracle.com

 /*
  * Copyright (c) 1999, 2012, 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 com.sun.tools.javac.code.Source;
 import com.sun.tools.javac.parser.Tokens.Comment.CommentStyle;
 import com.sun.tools.javac.util.*;
 import java.nio.CharBuffer;
 import static com.sun.tools.javac.parser.Tokens.*;
 import static com.sun.tools.javac.util.LayoutCharacters.*;
 /** The lexical analyzer maps an input stream consisting of
  *  ASCII characters and Unicode escapes into a token sequence.
  *
  *  <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 JavaTokenizer {
     private static boolean scannerDebug = false;
     /** Allow hex floating-point literals.
      */
     private boolean allowHexFloats;
     /** Allow binary literals.
      */
     private boolean allowBinaryLiterals;
     /** Allow underscores in literals.
      */
     private boolean allowUnderscoresInLiterals;
     /** The source language setting.
      */
     private Source source;
     /** The log to be used for error reporting.
      */
     private final Log log;
     /** The token factory. */
     private final Tokens tokens;
     /** The token kind, set by nextToken().
      */
     protected TokenKind tk;
     /** The token's radix, set by nextToken().
      */
     protected int radix;
     /** The token's name, set by nextToken().
      */
     protected Name name;
     /** The position where a lexical error occurred;
      */
     protected int errPos = Position.NOPOS;
     /** The Unicode reader (low-level stream reader).
      */
     protected UnicodeReader reader;
     protected ScannerFactory fac;
     private static final boolean hexFloatsWork = hexFloatsWork();
     private static boolean hexFloatsWork() {
         try {
             Float.valueOf("0x1.0p1");
             return true;
         } catch (NumberFormatException ex) {
             return false;
         }
     }
     /**
      * Create a scanner from the input array.  This method might
      * modify the array.  To avoid copying the input array, ensure
      * that {@code inputLength < input.length} or
      * {@code input[input.length -1]} is a white space character.
      *
      * @param fac the factory which created this Scanner
      * @param buf the input, might be modified
      * Must be positive and less than or equal to input.length.
      */
     protected JavaTokenizer(ScannerFactory fac, CharBuffer buf) {
         this(fac, new UnicodeReader(fac, buf));
     }
     protected JavaTokenizer(ScannerFactory fac, char[] buf, int inputLength) {
         this(fac, new UnicodeReader(fac, buf, inputLength));
     }
     protected JavaTokenizer(ScannerFactory fac, UnicodeReader reader) {
         this.fac = fac;
         this.log = fac.log;
         this.tokens = fac.tokens;
         this.source = fac.source;
         this.reader = reader;
         this.allowBinaryLiterals = source.allowBinaryLiterals();
         this.allowHexFloats = source.allowHexFloats();
         this.allowUnderscoresInLiterals = source.allowUnderscoresInLiterals();
     }
     /** Report an error at the given position using the provided arguments.
      */
     protected void lexError(int pos, String key, Object... args) {
         log.error(pos, key, args);
         tk = TokenKind.ERROR;
         errPos = pos;
     }
     /** Read next character in character or string literal and copy into sbuf.
      */
     private void scanLitChar(int pos) {
         if (reader.ch == '\\') {
             if (reader.peekChar() == '\\' && !reader.isUnicode()) {
                 reader.skipChar();
                 reader.putChar('\\', true);
             } else {
                 reader.scanChar();
                 switch (reader.ch) {
                 case '0': case '1': case '2': case '3':
                 case '4': case '5': case '6': case '7':
                     char leadch = reader.ch;
                     int oct = reader.digit(pos, 8);
                     reader.scanChar();
                     if ('0' <= reader.ch && reader.ch <= '7') {
                         oct = oct * 8 + reader.digit(pos, 8);
                         reader.scanChar();
                         if (leadch <= '3' && '0' <= reader.ch && reader.ch <= '7') {
                             oct = oct * 8 + reader.digit(pos, 8);
                             reader.scanChar();
                         }
                     }
                     reader.putChar((char)oct);
                     break;
                 case 'b':
                     reader.putChar('\b', true); break;
                 case 't':
                     reader.putChar('\t', true); break;
                 case 'n':
                     reader.putChar('\n', true); break;
                 case 'f':
                     reader.putChar('\f', true); break;
                 case 'r':
                     reader.putChar('\r', true); break;
                 case '\'':
                     reader.putChar('\'', true); break;
                 case '\"':
                     reader.putChar('\"', true); break;
                 case '\\':
                     reader.putChar('\\', true); break;
                 default:
                     lexError(reader.bp, "illegal.esc.char");
                 }
             }
         } else if (reader.bp != reader.buflen) {
             reader.putChar(true);
         }
     }
     private void scanDigits(int pos, int digitRadix) {
         char saveCh;
         int savePos;
         do {
             if (reader.ch != '_') {
                 reader.putChar(false);
             } else {
                 if (!allowUnderscoresInLiterals) {
                     lexError(pos, "unsupported.underscore.lit", source.name);
                     allowUnderscoresInLiterals = true;
                 }
             }
             saveCh = reader.ch;
             savePos = reader.bp;
             reader.scanChar();
         } while (reader.digit(pos, digitRadix) >= 0 || reader.ch == '_');
         if (saveCh == '_')
             lexError(savePos, "illegal.underscore");
     }
     /** Read fractional part of hexadecimal floating point number.
      */
     private void scanHexExponentAndSuffix(int pos) {
         if (reader.ch == 'p' || reader.ch == 'P') {
             reader.putChar(true);
             skipIllegalUnderscores();
             if (reader.ch == '+' || reader.ch == '-') {
                 reader.putChar(true);
             }
             skipIllegalUnderscores();
             if ('0' <= reader.ch && reader.ch <= '9') {
                 scanDigits(pos, 10);
                 if (!allowHexFloats) {
                     lexError(pos, "unsupported.fp.lit", source.name);
                     allowHexFloats = true;
                 }
                 else if (!hexFloatsWork)
                     lexError(pos, "unsupported.cross.fp.lit");
             } else
                 lexError(pos, "malformed.fp.lit");
         } else {
             lexError(pos, "malformed.fp.lit");
         }
         if (reader.ch == 'f' || reader.ch == 'F') {
             reader.putChar(true);
             tk = TokenKind.FLOATLITERAL;
             radix = 16;
         } else {
             if (reader.ch == 'd' || reader.ch == 'D') {
                 reader.putChar(true);
             }
             tk = TokenKind.DOUBLELITERAL;
             radix = 16;
         }
     }
     /** Read fractional part of floating point number.
      */
     private void scanFraction(int pos) {
         skipIllegalUnderscores();
         if ('0' <= reader.ch && reader.ch <= '9') {
             scanDigits(pos, 10);
         }
         int sp1 = reader.sp;
         if (reader.ch == 'e' || reader.ch == 'E') {
             reader.putChar(true);
             skipIllegalUnderscores();
             if (reader.ch == '+' || reader.ch == '-') {
                 reader.putChar(true);
             }
             skipIllegalUnderscores();
             if ('0' <= reader.ch && reader.ch <= '9') {
                 scanDigits(pos, 10);
                 return;
             }
             lexError(pos, "malformed.fp.lit");
             reader.sp = sp1;
         }
     }
     /** Read fractional part and 'd' or 'f' suffix of floating point number.
      */
     private void scanFractionAndSuffix(int pos) {
         radix = 10;
         scanFraction(pos);
         if (reader.ch == 'f' || reader.ch == 'F') {
             reader.putChar(true);
             tk = TokenKind.FLOATLITERAL;
         } else {
             if (reader.ch == 'd' || reader.ch == 'D') {
                 reader.putChar(true);
             }
             tk = TokenKind.DOUBLELITERAL;
         }
     }
     /** Read fractional part and 'd' or 'f' suffix of floating point number.
      */
     private void scanHexFractionAndSuffix(int pos, boolean seendigit) {
         radix = 16;
         Assert.check(reader.ch == '.');
         reader.putChar(true);
         skipIllegalUnderscores();
         if (reader.digit(pos, 16) >= 0) {
             seendigit = true;
             scanDigits(pos, 16);
         }
         if (!seendigit)
             lexError(pos, "invalid.hex.number");
         else
             scanHexExponentAndSuffix(pos);
     }
     private void skipIllegalUnderscores() {
         if (reader.ch == '_') {
             lexError(reader.bp, "illegal.underscore");
             while (reader.ch == '_')
                 reader.scanChar();
         }
     }
     /** Read a number.
      *  @param radix  The radix of the number; one of 2, j8, 10, 16.
      */
     private void scanNumber(int pos, int radix) {
         // for octal, allow base-10 digit in case it's a float literal
         this.radix = radix;
         int digitRadix = (radix == 8 ? 10 : radix);
         boolean seendigit = false;
         if (reader.digit(pos, digitRadix) >= 0) {
             seendigit = true;
             scanDigits(pos, digitRadix);
         }
         if (radix == 16 && reader.ch == '.') {
             scanHexFractionAndSuffix(pos, seendigit);
         } else if (seendigit && radix == 16 && (reader.ch == 'p' || reader.ch == 'P')) {
             scanHexExponentAndSuffix(pos);
         } else if (digitRadix == 10 && reader.ch == '.') {
             reader.putChar(true);
             scanFractionAndSuffix(pos);
         } else if (digitRadix == 10 &&
                    (reader.ch == 'e' || reader.ch == 'E' ||
                     reader.ch == 'f' || reader.ch == 'F' ||
                     reader.ch == 'd' || reader.ch == 'D')) {
             scanFractionAndSuffix(pos);
         } else {
             if (reader.ch == 'l' || reader.ch == 'L') {
                 reader.scanChar();
                 tk = TokenKind.LONGLITERAL;
             } else {
                 tk = TokenKind.INTLITERAL;
             }
         }
     }
     /** Read an identifier.
      */
     private void scanIdent() {
         boolean isJavaIdentifierPart;
         char high;
         do {
             reader.putChar(true);
             switch (reader.ch) {
             case 'A': case 'B': case 'C': case 'D': case 'E':
             case 'F': case 'G': case 'H': case 'I': case 'J':
             case 'K': case 'L': case 'M': case 'N': case 'O':
             case 'P': case 'Q': case 'R': case 'S': case 'T':
             case 'U': case 'V': case 'W': case 'X': case 'Y':
             case 'Z':
             case 'a': case 'b': case 'c': case 'd': case 'e':
             case 'f': case 'g': case 'h': case 'i': case 'j':
             case 'k': case 'l': case 'm': case 'n': case 'o':
             case 'p': case 'q': case 'r': case 's': case 't':
             case 'u': case 'v': case 'w': case 'x': case 'y':
             case 'z':
             case '$': case '_':
             case '0': case '1': case '2': case '3': case '4':
             case '5': case '6': case '7': case '8': case '9':
             case '\u0000': case '\u0001': case '\u0002': case '\u0003':
             case '\u0004': case '\u0005': case '\u0006': case '\u0007':
             case '\u0008': case '\u000E': case '\u000F': case '\u0010':
             case '\u0011': case '\u0012': case '\u0013': case '\u0014':
             case '\u0015': case '\u0016': case '\u0017':
             case '\u0018': case '\u0019': case '\u001B':
             case '\u007F':
                 break;
             case '\u001A': // EOI is also a legal identifier part
                 if (reader.bp >= reader.buflen) {
                     name = reader.name();
                     tk = tokens.lookupKind(name);
                     return;
                 }
                 break;
             default:
                 if (reader.ch < '\u0080') {
                     // all ASCII range chars already handled, above
                     isJavaIdentifierPart = false;
                 } else {
                     high = reader.scanSurrogates();
                     if (high != 0) {
                         reader.putChar(high);
                         isJavaIdentifierPart = Character.isJavaIdentifierPart(
                             Character.toCodePoint(high, reader.ch));
                     } else {
                         isJavaIdentifierPart = Character.isJavaIdentifierPart(reader.ch);
                     }
                 }
                 if (!isJavaIdentifierPart) {
                     name = reader.name();
                     tk = tokens.lookupKind(name);
                     return;
                 }
             }
         } while (true);
     }
     /** Return true if reader.ch can be part of an operator.
      */
     private boolean isSpecial(char ch) {
         switch (ch) {
         case '!': case '%': case '&': case '*': case '?':
         case '+': case '-': case ':': case '<': case '=':
         case '>': case '^': case '|': case '~':
         case '@':
             return true;
         default:
             return false;
         }
     }
     /** Read longest possible sequence of special characters and convert
      *  to token.
      */
     private void scanOperator() {
         while (true) {
             reader.putChar(false);
             Name newname = reader.name();
             TokenKind tk1 = tokens.lookupKind(newname);
             if (tk1 == TokenKind.IDENTIFIER) {
                 reader.sp--;
                 break;
             }
             tk = tk1;
             reader.scanChar();
             if (!isSpecial(reader.ch)) break;
         }
     }
     /** Read token.
      */
     public Token readToken() {
         reader.sp = 0;
         name = null;
         radix = 0;
         int pos = 0;
         int endPos = 0;
         List<Comment> comments = null;
         try {
             loop: while (true) {
                 pos = reader.bp;
                 switch (reader.ch) {
                 case ' ': // (Spec 3.6)
                 case '\t': // (Spec 3.6)
                 case FF: // (Spec 3.6)
                     do {
                         reader.scanChar();
                     } while (reader.ch == ' ' || reader.ch == '\t' || reader.ch == FF);
                     processWhiteSpace(pos, reader.bp);
                     break;
                 case LF: // (Spec 3.4)
                     reader.scanChar();
                     processLineTerminator(pos, reader.bp);
                     break;
                 case CR: // (Spec 3.4)
                     reader.scanChar();
                     if (reader.ch == LF) {
                         reader.scanChar();
                     }
                     processLineTerminator(pos, reader.bp);
                     break;
                 case 'A': case 'B': case 'C': case 'D': case 'E':
                 case 'F': case 'G': case 'H': case 'I': case 'J':
                 case 'K': case 'L': case 'M': case 'N': case 'O':
                 case 'P': case 'Q': case 'R': case 'S': case 'T':
                 case 'U': case 'V': case 'W': case 'X': case 'Y':
                 case 'Z':
                 case 'a': case 'b': case 'c': case 'd': case 'e':
                 case 'f': case 'g': case 'h': case 'i': case 'j':
                 case 'k': case 'l': case 'm': case 'n': case 'o':
                 case 'p': case 'q': case 'r': case 's': case 't':
                 case 'u': case 'v': case 'w': case 'x': case 'y':
                 case 'z':
                 case '$': case '_':
                     scanIdent();
                     break loop;
                 case '0':
                     reader.scanChar();
                     if (reader.ch == 'x' || reader.ch == 'X') {
                         reader.scanChar();
                         skipIllegalUnderscores();
                         if (reader.ch == '.') {
                             scanHexFractionAndSuffix(pos, false);
                         } else if (reader.digit(pos, 16) < 0) {
                             lexError(pos, "invalid.hex.number");
                         } else {
                             scanNumber(pos, 16);
                         }
                     } else if (reader.ch == 'b' || reader.ch == 'B') {
                         if (!allowBinaryLiterals) {
                             lexError(pos, "unsupported.binary.lit", source.name);
                             allowBinaryLiterals = true;
                         }
                         reader.scanChar();
                         skipIllegalUnderscores();
                         if (reader.digit(pos, 2) < 0) {
                             lexError(pos, "invalid.binary.number");
                         } else {
                             scanNumber(pos, 2);
                         }
                     } else {
                         reader.putChar('0');
                         if (reader.ch == '_') {
                             int savePos = reader.bp;
                             do {
                                 reader.scanChar();
                             } while (reader.ch == '_');
                             if (reader.digit(pos, 10) < 0) {
                                 lexError(savePos, "illegal.underscore");
                             }
                         }
                         scanNumber(pos, 8);
                     }
                     break loop;
                 case '1': case '2': case '3': case '4':
                 case '5': case '6': case '7': case '8': case '9':
                     scanNumber(pos, 10);
                     break loop;
                 case '.':
                     reader.scanChar();
                     if ('0' <= reader.ch && reader.ch <= '9') {
                         reader.putChar('.');
                         scanFractionAndSuffix(pos);
                     } else if (reader.ch == '.') {
                         int savePos = reader.bp;
                         reader.putChar('.'); reader.putChar('.', true);
                         if (reader.ch == '.') {
                             reader.scanChar();
                             reader.putChar('.');
                             tk = TokenKind.ELLIPSIS;
                         } else {
                             lexError(savePos, "illegal.dot");
                         }
                     } else {
                         tk = TokenKind.DOT;
                     }
                     break loop;
                 case ',':
                     reader.scanChar(); tk = TokenKind.COMMA; break loop;
                 case ';':
                     reader.scanChar(); tk = TokenKind.SEMI; break loop;
                 case '(':
                     reader.scanChar(); tk = TokenKind.LPAREN; break loop;
                 case ')':
                     reader.scanChar(); tk = TokenKind.RPAREN; break loop;
                 case '[':
                     reader.scanChar(); tk = TokenKind.LBRACKET; break loop;
                 case ']':
                     reader.scanChar(); tk = TokenKind.RBRACKET; break loop;
                 case '{':
                     reader.scanChar(); tk = TokenKind.LBRACE; break loop;
                 case '}':
                     reader.scanChar(); tk = TokenKind.RBRACE; break loop;
                 case '/':
                     reader.scanChar();
                     if (reader.ch == '/') {
                         do {
                             reader.scanCommentChar();
                         } while (reader.ch != CR && reader.ch != LF && reader.bp < reader.buflen);
                         if (reader.bp < reader.buflen) {
                             comments = addComment(comments, processComment(pos, reader.bp, CommentStyle.LINE));
                         }
                         break;
                     } else if (reader.ch == '*') {
                         boolean isEmpty = false;
                         reader.scanChar();
                         CommentStyle style;
                         if (reader.ch == '*') {
                             style = CommentStyle.JAVADOC;
                             reader.scanCommentChar();
                             if (reader.ch == '/') {
                                 isEmpty = true;
                             }
                         } else {
                             style = CommentStyle.BLOCK;
                         }
                         while (!isEmpty && reader.bp < reader.buflen) {
                             if (reader.ch == '*') {
                                 reader.scanChar();
                                 if (reader.ch == '/') break;
                             } else {
                                 reader.scanCommentChar();
                             }
                         }
                         if (reader.ch == '/') {
                             reader.scanChar();
                             comments = addComment(comments, processComment(pos, reader.bp, style));
                             break;
                         } else {
                             lexError(pos, "unclosed.comment");
                             break loop;
                         }
                     } else if (reader.ch == '=') {
                         tk = TokenKind.SLASHEQ;
                         reader.scanChar();
                     } else {
                         tk = TokenKind.SLASH;
                     }
                     break loop;
                 case '\'':
                     reader.scanChar();
                     if (reader.ch == '\'') {
                         lexError(pos, "empty.char.lit");
                     } else {
                         if (reader.ch == CR || reader.ch == LF)
                             lexError(pos, "illegal.line.end.in.char.lit");
                         scanLitChar(pos);
                         char ch2 = reader.ch;
                         if (reader.ch == '\'') {
                             reader.scanChar();
                             tk = TokenKind.CHARLITERAL;
                         } else {
                             lexError(pos, "unclosed.char.lit");
                         }
                     }
                     break loop;
                 case '\"':
                     reader.scanChar();
                     while (reader.ch != '\"' && reader.ch != CR && reader.ch != LF && reader.bp < reader.buflen)
                         scanLitChar(pos);
                     if (reader.ch == '\"') {
                         tk = TokenKind.STRINGLITERAL;
                         reader.scanChar();
                     } else {
                         lexError(pos, "unclosed.str.lit");
                     }
                     break loop;
                 default:
                     if (isSpecial(reader.ch)) {
                         scanOperator();
                     } else {
                         boolean isJavaIdentifierStart;
                         if (reader.ch < '\u0080') {
                             // all ASCII range chars already handled, above
                             isJavaIdentifierStart = false;
                         } else {
                             char high = reader.scanSurrogates();
                             if (high != 0) {
                                 reader.putChar(high);
                                 isJavaIdentifierStart = Character.isJavaIdentifierStart(
                                     Character.toCodePoint(high, reader.ch));
                             } else {
                                 isJavaIdentifierStart = Character.isJavaIdentifierStart(reader.ch);
                             }
                         }
                         if (isJavaIdentifierStart) {
                             scanIdent();
                         } else if (reader.bp == reader.buflen || reader.ch == EOI && reader.bp + 1 == reader.buflen) { // JLS 3.5
                             tk = TokenKind.EOF;
                             pos = reader.buflen;
                         } else {
                             String arg = (32 < reader.ch && reader.ch < 127) ?
                                             String.format("%s", reader.ch) :
                                             String.format("\\u%04x", (int)reader.ch);
                             lexError(pos, "illegal.char", arg);
                             reader.scanChar();
                         }
                     }
                     break loop;
                 }
             }
             endPos = reader.bp;
             switch (tk.tag) {
                 case DEFAULT: return new Token(tk, pos, endPos, comments);
                 case NAMED: return new NamedToken(tk, pos, endPos, name, comments);
                 case STRING: return new StringToken(tk, pos, endPos, reader.chars(), comments);
                 case NUMERIC: return new NumericToken(tk, pos, endPos, reader.chars(), radix, comments);
                 default: throw new AssertionError();
             }
         }
         finally {
             if (scannerDebug) {
                     System.out.println("nextToken(" + pos
                                        + "," + endPos + ")=|" +
                                        new String(reader.getRawCharacters(pos, endPos))
                                        + "|");
             }
         }
     }
     //where
         List<Comment> addComment(List<Comment> comments, Comment comment) {
             return comments == null ?
                     List.of(comment) :
                     comments.prepend(comment);
         }
     /** Return the position where a lexical error occurred;
      */
     public int errPos() {
         return errPos;
     }
     /** Set the position where a lexical error occurred;
      */
     public void errPos(int pos) {
         errPos = pos;
     }
     /**
      * Called when a complete comment has been scanned. pos and endPos
      * will mark the comment boundary.
      */
     protected Tokens.Comment processComment(int pos, int endPos, CommentStyle style) {
         if (scannerDebug)
             System.out.println("processComment(" + pos
                                + "," + endPos + "," + style + ")=|"
                                + new String(reader.getRawCharacters(pos, endPos))
                                + "|");
         char[] buf = reader.getRawCharacters(pos, endPos);
         return new BasicComment<UnicodeReader>(new UnicodeReader(fac, buf, buf.length), style);
     }
     /**
      * Called when a complete whitespace run has been scanned. pos and endPos
      * will mark the whitespace boundary.
      */
     protected void processWhiteSpace(int pos, int endPos) {
         if (scannerDebug)
             System.out.println("processWhitespace(" + pos
                                + "," + endPos + ")=|" +
                                new String(reader.getRawCharacters(pos, endPos))
                                + "|");
     }
     /**
      * Called when a line terminator has been processed.
      */
     protected void processLineTerminator(int pos, int endPos) {
         if (scannerDebug)
             System.out.println("processTerminator(" + pos
                                + "," + endPos + ")=|" +
                                new String(reader.getRawCharacters(pos, endPos))
                                + "|");
     }
     /** Build a map for translating between line numbers and
      * positions in the input.
      *
      * @return a LineMap */
     public Position.LineMap getLineMap() {
         return Position.makeLineMap(reader.getRawCharacters(), reader.buflen, false);
     }
     /**
     * Scan a documentation comment; determine if a deprecated tag is present.
     * Called once the initial /, * have been skipped, positioned at the second *
     * (which is treated as the beginning of the first line).
     * Stops positioned at the closing '/'.
     */
     protected class BasicComment<U extends UnicodeReader> implements Comment {
         CommentStyle cs;
         U comment_reader;
         protected boolean deprecatedFlag = false;
         protected boolean scanned = false;
         protected BasicComment(U comment_reader, CommentStyle cs) {
             this.comment_reader = comment_reader;
             this.cs = cs;
         }
         public String getText() {
             return null;
         }
         public int getSourcePos(int pos) {
             return -1;
         }
         public CommentStyle getStyle() {
             return cs;
         }
         public boolean isDeprecated() {
             if (!scanned && cs == CommentStyle.JAVADOC) {
                 scanDocComment();
             }
             return deprecatedFlag;
         }
         @SuppressWarnings("fallthrough")
         protected void scanDocComment() {
             try {
                 boolean deprecatedPrefix = false;
                 comment_reader.bp += 3; // '/**'
                 comment_reader.ch = comment_reader.buf[comment_reader.bp];
                 forEachLine:
                 while (comment_reader.bp < comment_reader.buflen) {
                     // Skip optional WhiteSpace at beginning of line
                     while (comment_reader.bp < comment_reader.buflen && (comment_reader.ch == ' ' || comment_reader.ch == '\t' || comment_reader.ch == FF)) {
                         comment_reader.scanCommentChar();
                     }
                     // Skip optional consecutive Stars
                     while (comment_reader.bp < comment_reader.buflen && comment_reader.ch == '*') {
                         comment_reader.scanCommentChar();
                         if (comment_reader.ch == '/') {
                             return;
                         }
                     }
                     // Skip optional WhiteSpace after Stars
                     while (comment_reader.bp < comment_reader.buflen && (comment_reader.ch == ' ' || comment_reader.ch == '\t' || comment_reader.ch == FF)) {
                         comment_reader.scanCommentChar();
                     }
                     deprecatedPrefix = false;
                     // At beginning of line in the JavaDoc sense.
                     if (!deprecatedFlag) {
                         String deprecated = "@deprecated";
                         int i = 0;
                         while (comment_reader.bp < comment_reader.buflen && comment_reader.ch == deprecated.charAt(i)) {
                             comment_reader.scanCommentChar();
                             i++;
                             if (i == deprecated.length()) {
                                 deprecatedPrefix = true;
                                 break;
                             }
                         }
                     }
                     if (deprecatedPrefix && comment_reader.bp < comment_reader.buflen) {
                         if (Character.isWhitespace(comment_reader.ch)) {
                             deprecatedFlag = true;
                         } else if (comment_reader.ch == '*') {
                             comment_reader.scanCommentChar();
                             if (comment_reader.ch == '/') {
                                 deprecatedFlag = true;
                                 return;
                             }
                         }
                     }
                     // Skip rest of line
                     while (comment_reader.bp < comment_reader.buflen) {
                         switch (comment_reader.ch) {
                             case '*':
                                 comment_reader.scanCommentChar();
                                 if (comment_reader.ch == '/') {
                                     return;
                                 }
                                 break;
                             case CR: // (Spec 3.4)
                                 comment_reader.scanCommentChar();
                                 if (comment_reader.ch != LF) {
                                     continue forEachLine;
                                 }
                             /* fall through to LF case */
                             case LF: // (Spec 3.4)
                                 comment_reader.scanCommentChar();
                                 continue forEachLine;
                             default:
                                 comment_reader.scanCommentChar();
                         }
                     } // rest of line
                 } // forEachLine
                 return;
             } finally {
                 scanned = true;
             }
         }
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/javac/parser/JavaTokenizer.java@75c936d14c6a (annotated)

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