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

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

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

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

author: ohair
date: Tue, 28 Dec 2010 15:54:52 -0800
changeset 798: 4868a36f6fd8
parent 752: 03177f49411d
child 816: 7c537f4298fb
permissions: -rw-r--r--

6962318: Update copyright year
Reviewed-by: xdono

 /*
  * Copyright (c) 1999, 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.code.Source;
 import com.sun.tools.javac.file.JavacFileManager;
 import com.sun.tools.javac.util.*;
 import static com.sun.tools.javac.parser.Token.*;
 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 Scanner implements Lexer {
     private static boolean scannerDebug = false;
     /* Output variables; set by nextToken():
      */
     /** The token, set by nextToken().
      */
     private Token token;
     /** 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 token's position, 0-based offset from beginning of text.
      */
     private int pos;
     /** Character position just after the last character of the token.
      */
     private int endPos;
     /** The last character position of the previous token.
      */
     private int prevEndPos;
     /** The position where a lexical error occurred;
      */
     private int errPos = Position.NOPOS;
     /** The name of an identifier or token:
      */
     private Name name;
     /** The radix of a numeric literal token.
      */
     private int radix;
     /** Has a @deprecated been encountered in last doc comment?
      *  this needs to be reset by client.
      */
     protected boolean deprecatedFlag = false;
     /** A character buffer for literals.
      */
     private char[] sbuf = new char[128];
     private int sp;
     /** The 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;
     private int eofPos;
     /** The current character.
      */
     private char ch;
     /** The buffer index of the last converted unicode character
      */
     private int unicodeConversionBp = -1;
     /** The log to be used for error reporting.
      */
     private final Log log;
     /** The name table. */
     private final Names names;
     /** The keyword table. */
     private final Keywords keywords;
     /** Common code for constructors. */
     private Scanner(ScannerFactory fac) {
         log = fac.log;
         names = fac.names;
         keywords = fac.keywords;
         source = fac.source;
         allowBinaryLiterals = source.allowBinaryLiterals();
         allowHexFloats = source.allowHexFloats();
         allowUnderscoresInLiterals = source.allowBinaryLiterals();
     }
     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 buffer.  buffer must implement
      *  array() and compact(), and remaining() must be less than limit().
      */
     protected Scanner(ScannerFactory fac, CharBuffer buffer) {
         this(fac, JavacFileManager.toArray(buffer), buffer.limit());
     }
     /**
      * 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 input the input, might be modified
      * @param inputLength the size of the input.
      * Must be positive and less than or equal to input.length.
      */
     protected Scanner(ScannerFactory fac, char[] input, int inputLength) {
         this(fac);
         eofPos = inputLength;
         if (inputLength == input.length) {
             if (input.length > 0 && Character.isWhitespace(input[input.length - 1])) {
                 inputLength--;
             } else {
                 char[] newInput = new char[inputLength + 1];
                 System.arraycopy(input, 0, newInput, 0, input.length);
                 input = newInput;
             }
         }
         buf = input;
         buflen = inputLength;
         buf[buflen] = EOI;
         bp = -1;
         scanChar();
     }
     /** Report an error at the given position using the provided arguments.
      */
     private void lexError(int pos, String key, Object... args) {
         log.error(pos, key, args);
         token = ERROR;
         errPos = pos;
     }
     /** Report an error at the current token position using the provided
      *  arguments.
      */
     private void lexError(String key, Object... args) {
         lexError(pos, key, args);
     }
     /** 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) {
             lexError(pos+1, "illegal.nonascii.digit");
             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];
             if (ch == 'u') {
                 do {
                     bp++; ch = buf[bp];
                 } 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];
                         d = digit(16);
                         code = (code << 4) + d;
                     }
                     if (d >= 0) {
                         ch = (char)code;
                         unicodeConversionBp = bp;
                         return;
                     }
                 }
                 lexError(bp, "illegal.unicode.esc");
             } else {
                 bp--;
                 ch = '\\';
             }
         }
     }
     /** Read next character.
      */
     private void scanChar() {
         ch = buf[++bp];
         if (ch == '\\') {
             convertUnicode();
         }
     }
     /** Read next character in comment, skipping over double '\' characters.
      */
     private void scanCommentChar() {
         scanChar();
         if (ch == '\\') {
             if (buf[bp+1] == '\\' && unicodeConversionBp != bp) {
                 bp++;
             } else {
                 convertUnicode();
             }
         }
     }
     /** Append a character to sbuf.
      */
     private void putChar(char ch) {
         if (sp == sbuf.length) {
             char[] newsbuf = new char[sbuf.length * 2];
             System.arraycopy(sbuf, 0, newsbuf, 0, sbuf.length);
             sbuf = newsbuf;
         }
         sbuf[sp++] = ch;
     }
     /** For debugging purposes: print character.
      */
     private void dch() {
         System.err.print(ch); System.out.flush();
     }
     /** Read next character in character or string literal and copy into sbuf.
      */
     private void scanLitChar() {
         if (ch == '\\') {
             if (buf[bp+1] == '\\' && unicodeConversionBp != bp) {
                 bp++;
                 putChar('\\');
                 scanChar();
             } else {
                 scanChar();
                 switch (ch) {
                 case '0': case '1': case '2': case '3':
                 case '4': case '5': case '6': case '7':
                     char leadch = ch;
                     int oct = digit(8);
                     scanChar();
                     if ('0' <= ch && ch <= '7') {
                         oct = oct * 8 + digit(8);
                         scanChar();
                         if (leadch <= '3' && '0' <= ch && ch <= '7') {
                             oct = oct * 8 + digit(8);
                             scanChar();
                         }
                     }
                     putChar((char)oct);
                     break;
                 case 'b':
                     putChar('\b'); scanChar(); break;
                 case 't':
                     putChar('\t'); scanChar(); break;
                 case 'n':
                     putChar('\n'); scanChar(); break;
                 case 'f':
                     putChar('\f'); scanChar(); break;
                 case 'r':
                     putChar('\r'); scanChar(); break;
                 case '\'':
                     putChar('\''); scanChar(); break;
                 case '\"':
                     putChar('\"'); scanChar(); break;
                 case '\\':
                     putChar('\\'); scanChar(); break;
                 default:
                     lexError(bp, "illegal.esc.char");
                 }
             }
         } else if (bp != buflen) {
             putChar(ch); scanChar();
         }
     }
     private void scanDigits(int digitRadix) {
         char saveCh;
         int savePos;
         do {
             if (ch != '_') {
                 putChar(ch);
             } else {
                 if (!allowUnderscoresInLiterals) {
                     lexError("unsupported.underscore.lit", source.name);
                     allowUnderscoresInLiterals = true;
                 }
             }
             saveCh = ch;
             savePos = bp;
             scanChar();
         } while (digit(digitRadix) >= 0 || ch == '_');
         if (saveCh == '_')
             lexError(savePos, "illegal.underscore");
     }
     /** Read fractional part of hexadecimal floating point number.
      */
     private void scanHexExponentAndSuffix() {
         if (ch == 'p' || ch == 'P') {
             putChar(ch);
             scanChar();
             skipIllegalUnderscores();
             if (ch == '+' || ch == '-') {
                 putChar(ch);
                 scanChar();
             }
             skipIllegalUnderscores();
             if ('0' <= ch && ch <= '9') {
                 scanDigits(10);
                 if (!allowHexFloats) {
                     lexError("unsupported.fp.lit", source.name);
                     allowHexFloats = true;
                 }
                 else if (!hexFloatsWork)
                     lexError("unsupported.cross.fp.lit");
             } else
                 lexError("malformed.fp.lit");
         } else {
             lexError("malformed.fp.lit");
         }
         if (ch == 'f' || ch == 'F') {
             putChar(ch);
             scanChar();
             token = FLOATLITERAL;
         } else {
             if (ch == 'd' || ch == 'D') {
                 putChar(ch);
                 scanChar();
             }
             token = DOUBLELITERAL;
         }
     }
     /** Read fractional part of floating point number.
      */
     private void scanFraction() {
         skipIllegalUnderscores();
         if ('0' <= ch && ch <= '9') {
             scanDigits(10);
         }
         int sp1 = sp;
         if (ch == 'e' || ch == 'E') {
             putChar(ch);
             scanChar();
             skipIllegalUnderscores();
             if (ch == '+' || ch == '-') {
                 putChar(ch);
                 scanChar();
             }
             skipIllegalUnderscores();
             if ('0' <= ch && ch <= '9') {
                 scanDigits(10);
                 return;
             }
             lexError("malformed.fp.lit");
             sp = sp1;
         }
     }
     /** Read fractional part and 'd' or 'f' suffix of floating point number.
      */
     private void scanFractionAndSuffix() {
         this.radix = 10;
         scanFraction();
         if (ch == 'f' || ch == 'F') {
             putChar(ch);
             scanChar();
             token = FLOATLITERAL;
         } else {
             if (ch == 'd' || ch == 'D') {
                 putChar(ch);
                 scanChar();
             }
             token = DOUBLELITERAL;
         }
     }
     /** Read fractional part and 'd' or 'f' suffix of floating point number.
      */
     private void scanHexFractionAndSuffix(boolean seendigit) {
         this.radix = 16;
         assert ch == '.';
         putChar(ch);
         scanChar();
         skipIllegalUnderscores();
         if (digit(16) >= 0) {
             seendigit = true;
             scanDigits(16);
         }
         if (!seendigit)
             lexError("invalid.hex.number");
         else
             scanHexExponentAndSuffix();
     }
     private void skipIllegalUnderscores() {
         if (ch == '_') {
             lexError(bp, "illegal.underscore");
             while (ch == '_')
                 scanChar();
         }
     }
     /** Read a number.
      *  @param radix  The radix of the number; one of 2, j8, 10, 16.
      */
     private void scanNumber(int radix) {
         this.radix = radix;
         // for octal, allow base-10 digit in case it's a float literal
         int digitRadix = (radix == 8 ? 10 : radix);
         boolean seendigit = false;
         if (digit(digitRadix) >= 0) {
             seendigit = true;
             scanDigits(digitRadix);
         }
         if (radix == 16 && ch == '.') {
             scanHexFractionAndSuffix(seendigit);
         } else if (seendigit && radix == 16 && (ch == 'p' || ch == 'P')) {
             scanHexExponentAndSuffix();
         } else if (digitRadix == 10 && ch == '.') {
             putChar(ch);
             scanChar();
             scanFractionAndSuffix();
         } else if (digitRadix == 10 &&
                    (ch == 'e' || ch == 'E' ||
                     ch == 'f' || ch == 'F' ||
                     ch == 'd' || ch == 'D')) {
             scanFractionAndSuffix();
         } else {
             if (ch == 'l' || ch == 'L') {
                 scanChar();
                 token = LONGLITERAL;
             } else {
                 token = INTLITERAL;
             }
         }
     }
     /** Read an identifier.
      */
     private void scanIdent() {
         boolean isJavaIdentifierPart;
         char high;
         do {
             if (sp == sbuf.length) putChar(ch); else sbuf[sp++] = ch;
             // optimization, was: putChar(ch);
             scanChar();
             switch (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 (bp >= buflen) {
                     name = names.fromChars(sbuf, 0, sp);
                     token = keywords.key(name);
                     return;
                 }
                 break;
             default:
                 if (ch < '\u0080') {
                     // all ASCII range chars already handled, above
                     isJavaIdentifierPart = false;
                 } else {
                     high = scanSurrogates();
                     if (high != 0) {
                         if (sp == sbuf.length) {
                             putChar(high);
                         } else {
                             sbuf[sp++] = high;
                         }
                         isJavaIdentifierPart = Character.isJavaIdentifierPart(
                             Character.toCodePoint(high, ch));
                     } else {
                         isJavaIdentifierPart = Character.isJavaIdentifierPart(ch);
                     }
                 }
                 if (!isJavaIdentifierPart) {
                     name = names.fromChars(sbuf, 0, sp);
                     token = keywords.key(name);
                     return;
                 }
             }
         } while (true);
     }
     /** Are surrogates supported?
      */
     final static boolean surrogatesSupported = surrogatesSupported();
     private static boolean surrogatesSupported() {
         try {
             Character.isHighSurrogate('a');
             return true;
         } catch (NoSuchMethodError ex) {
             return false;
         }
     }
     /** Scan surrogate pairs.  If 'ch' is a high surrogate and
      *  the next character is a low surrogate, then put the low
      *  surrogate in 'ch', and return the high surrogate.
      *  otherwise, just return 0.
      */
     private char scanSurrogates() {
         if (surrogatesSupported && Character.isHighSurrogate(ch)) {
             char high = ch;
             scanChar();
             if (Character.isLowSurrogate(ch)) {
                 return high;
             }
             ch = high;
         }
         return 0;
     }
     /** Return true if 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) {
             putChar(ch);
             Name newname = names.fromChars(sbuf, 0, sp);
             if (keywords.key(newname) == IDENTIFIER) {
                 sp--;
                 break;
             }
             name = newname;
             token = keywords.key(newname);
             scanChar();
             if (!isSpecial(ch)) break;
         }
     }
     /**
      * Scan a documention 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 '/'.
      */
     @SuppressWarnings("fallthrough")
     private void scanDocComment() {
         boolean deprecatedPrefix = false;
         forEachLine:
         while (bp < buflen) {
             // Skip optional WhiteSpace at beginning of line
             while (bp < buflen && (ch == ' ' || ch == '\t' || ch == FF)) {
                 scanCommentChar();
             }
             // Skip optional consecutive Stars
             while (bp < buflen && ch == '*') {
                 scanCommentChar();
                 if (ch == '/') {
                     return;
                 }
             }
             // Skip optional WhiteSpace after Stars
             while (bp < buflen && (ch == ' ' || ch == '\t' || ch == FF)) {
                 scanCommentChar();
             }
             deprecatedPrefix = false;
             // At beginning of line in the JavaDoc sense.
             if (bp < buflen && ch == '@' && !deprecatedFlag) {
                 scanCommentChar();
                 if (bp < buflen && ch == 'd') {
                     scanCommentChar();
                     if (bp < buflen && ch == 'e') {
                         scanCommentChar();
                         if (bp < buflen && ch == 'p') {
                             scanCommentChar();
                             if (bp < buflen && ch == 'r') {
                                 scanCommentChar();
                                 if (bp < buflen && ch == 'e') {
                                     scanCommentChar();
                                     if (bp < buflen && ch == 'c') {
                                         scanCommentChar();
                                         if (bp < buflen && ch == 'a') {
                                             scanCommentChar();
                                             if (bp < buflen && ch == 't') {
                                                 scanCommentChar();
                                                 if (bp < buflen && ch == 'e') {
                                                     scanCommentChar();
                                                     if (bp < buflen && ch == 'd') {
                                                         deprecatedPrefix = true;
                                                         scanCommentChar();
                                                     }}}}}}}}}}}
             if (deprecatedPrefix && bp < buflen) {
                 if (Character.isWhitespace(ch)) {
                     deprecatedFlag = true;
                 } else if (ch == '*') {
                     scanCommentChar();
                     if (ch == '/') {
                         deprecatedFlag = true;
                         return;
                     }
                 }
             }
             // Skip rest of line
             while (bp < buflen) {
                 switch (ch) {
                 case '*':
                     scanCommentChar();
                     if (ch == '/') {
                         return;
                     }
                     break;
                 case CR: // (Spec 3.4)
                     scanCommentChar();
                     if (ch != LF) {
                         continue forEachLine;
                     }
                     /* fall through to LF case */
                 case LF: // (Spec 3.4)
                     scanCommentChar();
                     continue forEachLine;
                 default:
                     scanCommentChar();
                 }
             } // rest of line
         } // forEachLine
         return;
     }
     /** The value of a literal token, recorded as a string.
      *  For integers, leading 0x and 'l' suffixes are suppressed.
      */
     public String stringVal() {
         return new String(sbuf, 0, sp);
     }
     /** Read token.
      */
     public void nextToken() {
         try {
             prevEndPos = endPos;
             sp = 0;
             while (true) {
                 pos = bp;
                 switch (ch) {
                 case ' ': // (Spec 3.6)
                 case '\t': // (Spec 3.6)
                 case FF: // (Spec 3.6)
                     do {
                         scanChar();
                     } while (ch == ' ' || ch == '\t' || ch == FF);
                     endPos = bp;
                     processWhiteSpace();
                     break;
                 case LF: // (Spec 3.4)
                     scanChar();
                     endPos = bp;
                     processLineTerminator();
                     break;
                 case CR: // (Spec 3.4)
                     scanChar();
                     if (ch == LF) {
                         scanChar();
                     }
                     endPos = bp;
                     processLineTerminator();
                     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();
                     return;
                 case '0':
                     scanChar();
                     if (ch == 'x' || ch == 'X') {
                         scanChar();
                         skipIllegalUnderscores();
                         if (ch == '.') {
                             scanHexFractionAndSuffix(false);
                         } else if (digit(16) < 0) {
                             lexError("invalid.hex.number");
                         } else {
                             scanNumber(16);
                         }
                     } else if (ch == 'b' || ch == 'B') {
                         if (!allowBinaryLiterals) {
                             lexError("unsupported.binary.lit", source.name);
                             allowBinaryLiterals = true;
                         }
                         scanChar();
                         skipIllegalUnderscores();
                         if (digit(2) < 0) {
                             lexError("invalid.binary.number");
                         } else {
                             scanNumber(2);
                         }
                     } else {
                         putChar('0');
                         if (ch == '_') {
                             int savePos = bp;
                             do {
                                 scanChar();
                             } while (ch == '_');
                             if (digit(10) < 0) {
                                 lexError(savePos, "illegal.underscore");
                             }
                         }
                         scanNumber(8);
                     }
                     return;
                 case '1': case '2': case '3': case '4':
                 case '5': case '6': case '7': case '8': case '9':
                     scanNumber(10);
                     return;
                 case '.':
                     scanChar();
                     if ('0' <= ch && ch <= '9') {
                         putChar('.');
                         scanFractionAndSuffix();
                     } else if (ch == '.') {
                         putChar('.'); putChar('.');
                         scanChar();
                         if (ch == '.') {
                             scanChar();
                             putChar('.');
                             token = ELLIPSIS;
                         } else {
                             lexError("malformed.fp.lit");
                         }
                     } else {
                         token = DOT;
                     }
                     return;
                 case ',':
                     scanChar(); token = COMMA; return;
                 case ';':
                     scanChar(); token = SEMI; return;
                 case '(':
                     scanChar(); token = LPAREN; return;
                 case ')':
                     scanChar(); token = RPAREN; return;
                 case '[':
                     scanChar(); token = LBRACKET; return;
                 case ']':
                     scanChar(); token = RBRACKET; return;
                 case '{':
                     scanChar(); token = LBRACE; return;
                 case '}':
                     scanChar(); token = RBRACE; return;
                 case '/':
                     scanChar();
                     if (ch == '/') {
                         do {
                             scanCommentChar();
                         } while (ch != CR && ch != LF && bp < buflen);
                         if (bp < buflen) {
                             endPos = bp;
                             processComment(CommentStyle.LINE);
                         }
                         break;
                     } else if (ch == '*') {
                         scanChar();
                         CommentStyle style;
                         if (ch == '*') {
                             style = CommentStyle.JAVADOC;
                             scanDocComment();
                         } else {
                             style = CommentStyle.BLOCK;
                             while (bp < buflen) {
                                 if (ch == '*') {
                                     scanChar();
                                     if (ch == '/') break;
                                 } else {
                                     scanCommentChar();
                                 }
                             }
                         }
                         if (ch == '/') {
                             scanChar();
                             endPos = bp;
                             processComment(style);
                             break;
                         } else {
                             lexError("unclosed.comment");
                             return;
                         }
                     } else if (ch == '=') {
                         name = names.slashequals;
                         token = SLASHEQ;
                         scanChar();
                     } else {
                         name = names.slash;
                         token = SLASH;
                     }
                     return;
                 case '\'':
                     scanChar();
                     if (ch == '\'') {
                         lexError("empty.char.lit");
                     } else {
                         if (ch == CR || ch == LF)
                             lexError(pos, "illegal.line.end.in.char.lit");
                         scanLitChar();
                         if (ch == '\'') {
                             scanChar();
                             token = CHARLITERAL;
                         } else {
                             lexError(pos, "unclosed.char.lit");
                         }
                     }
                     return;
                 case '\"':
                     scanChar();
                     while (ch != '\"' && ch != CR && ch != LF && bp < buflen)
                         scanLitChar();
                     if (ch == '\"') {
                         token = STRINGLITERAL;
                         scanChar();
                     } else {
                         lexError(pos, "unclosed.str.lit");
                     }
                     return;
                 default:
                     if (isSpecial(ch)) {
                         scanOperator();
                     } else {
                         boolean isJavaIdentifierStart;
                         if (ch < '\u0080') {
                             // all ASCII range chars already handled, above
                             isJavaIdentifierStart = false;
                         } else {
                             char high = scanSurrogates();
                             if (high != 0) {
                                 if (sp == sbuf.length) {
                                     putChar(high);
                                 } else {
                                     sbuf[sp++] = high;
                                 }
                                 isJavaIdentifierStart = Character.isJavaIdentifierStart(
                                     Character.toCodePoint(high, ch));
                             } else {
                                 isJavaIdentifierStart = Character.isJavaIdentifierStart(ch);
                             }
                         }
                         if (isJavaIdentifierStart) {
                             scanIdent();
                         } else if (bp == buflen || ch == EOI && bp+1 == buflen) { // JLS 3.5
                             token = EOF;
                             pos = bp = eofPos;
                         } else {
                             lexError("illegal.char", String.valueOf((int)ch));
                             scanChar();
                         }
                     }
                     return;
                 }
             }
         } finally {
             endPos = bp;
             if (scannerDebug)
                 System.out.println("nextToken(" + pos
                                    + "," + endPos + ")=|" +
                                    new String(getRawCharacters(pos, endPos))
                                    + "|");
         }
     }
     /** Return the current token, set by nextToken().
      */
     public Token token() {
         return token;
     }
     /** Sets the current token.
      */
     public void token(Token token) {
         this.token = token;
     }
     /** Return the current token's position: a 0-based
      *  offset from beginning of the raw input stream
      *  (before unicode translation)
      */
     public int pos() {
         return pos;
     }
     /** Return the last character position of the current token.
      */
     public int endPos() {
         return endPos;
     }
     /** Return the last character position of the previous token.
      */
     public int prevEndPos() {
         return prevEndPos;
     }
     /** 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;
     }
     /** Return the name of an identifier or token for the current token.
      */
     public Name name() {
         return name;
     }
     /** Return the radix of a numeric literal token.
      */
     public int radix() {
         return radix;
     }
     /** Has a @deprecated been encountered in last doc comment?
      *  This needs to be reset by client with resetDeprecatedFlag.
      */
     public boolean deprecatedFlag() {
         return deprecatedFlag;
     }
     public void resetDeprecatedFlag() {
         deprecatedFlag = false;
     }
     /**
      * Returns the documentation string of the current token.
      */
     public String docComment() {
         return null;
     }
     /**
      * Returns a copy of the input buffer, up to its inputLength.
      * Unicode escape sequences are not translated.
      */
     public char[] getRawCharacters() {
         char[] chars = new char[buflen];
         System.arraycopy(buf, 0, chars, 0, buflen);
         return chars;
     }
     /**
      * Returns a copy of a character array subset of the input buffer.
      * The returned array begins at the <code>beginIndex</code> and
      * extends to the character at index <code>endIndex - 1</code>.
      * Thus the length of the substring is <code>endIndex-beginIndex</code>.
      * This behavior is like
      * <code>String.substring(beginIndex, endIndex)</code>.
      * Unicode escape sequences are not translated.
      *
      * @param beginIndex the beginning index, inclusive.
      * @param endIndex the ending index, exclusive.
      * @throws IndexOutOfBounds if either offset is outside of the
      *         array bounds
      */
     public char[] getRawCharacters(int beginIndex, int endIndex) {
         int length = endIndex - beginIndex;
         char[] chars = new char[length];
         System.arraycopy(buf, beginIndex, chars, 0, length);
         return chars;
     }
     public enum CommentStyle {
         LINE,
         BLOCK,
         JAVADOC,
     }
     /**
      * Called when a complete comment has been scanned. pos and endPos
      * will mark the comment boundary.
      */
     protected void processComment(CommentStyle style) {
         if (scannerDebug)
             System.out.println("processComment(" + pos
                                + "," + endPos + "," + style + ")=|"
                                + new String(getRawCharacters(pos, endPos))
                                + "|");
     }
     /**
      * Called when a complete whitespace run has been scanned. pos and endPos
      * will mark the whitespace boundary.
      */
     protected void processWhiteSpace() {
         if (scannerDebug)
             System.out.println("processWhitespace(" + pos
                                + "," + endPos + ")=|" +
                                new String(getRawCharacters(pos, endPos))
                                + "|");
     }
     /**
      * Called when a line terminator has been processed.
      */
     protected void processLineTerminator() {
         if (scannerDebug)
             System.out.println("processTerminator(" + pos
                                + "," + endPos + ")=|" +
                                new String(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(buf, buflen, false);
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

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

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