8048805: Request to investigate and update lexer error recovery in javac
8046620: Further investigation needed for few error messages for negative unicode tests in langtools regression ws
8048803: javac should report complete character code in the error messages
Summary: Improving error reporting and recovery in the lexer
Reviewed-by: jjg, mcimadamore
Contributed-by: jan.lahoda@oracle.com, sonali.goel@oracle.com
/*
* Copyright (c) 1999, 2014, 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 final boolean scannerDebug = false;
/** 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.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 (reader.digit(pos, 10) >= 0) {
scanDigits(pos, 10);
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 (reader.digit(pos, 10) >= 0) {
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 (reader.digit(pos, 10) >= 0) {
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;
reader.putChar(true);
do {
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':
break;
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':
reader.scanChar();
continue;
case '\u001A': // EOI is also a legal identifier part
if (reader.bp >= reader.buflen) {
name = reader.name();
tk = tokens.lookupKind(name);
return;
}
reader.scanChar();
continue;
default:
if (reader.ch < '\u0080') {
// all ASCII range chars already handled, above
isJavaIdentifierPart = false;
} else {
if (Character.isIdentifierIgnorable(reader.ch)) {
reader.scanChar();
continue;
} else {
int codePoint = reader.peekSurrogates();
if (codePoint >= 0) {
if (isJavaIdentifierPart = Character.isJavaIdentifierPart(codePoint)) {
reader.putChar(true);
}
} else {
isJavaIdentifierPart = Character.isJavaIdentifierPart(reader.ch);
}
}
}
if (!isJavaIdentifierPart) {
name = reader.name();
tk = tokens.lookupKind(name);
return;
}
}
reader.putChar(true);
} 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 (reader.digit(pos, 10) >= 0) {
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");
reader.scanChar();
} else {
if (reader.ch == CR || reader.ch == LF)
lexError(pos, "illegal.line.end.in.char.lit");
scanLitChar(pos);
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;
int codePoint = -1;
if (reader.ch < '\u0080') {
// all ASCII range chars already handled, above
isJavaIdentifierStart = false;
} else {
codePoint = reader.peekSurrogates();
if (codePoint >= 0) {
if (isJavaIdentifierStart = Character.isJavaIdentifierStart(codePoint)) {
reader.putChar(true);
}
} else {
isJavaIdentifierStart = Character.isJavaIdentifierStart(reader.ch);
}
}
if (isJavaIdentifierStart) {
scanIdent();
} else if (reader.digit(pos, 10) >= 0) {
scanNumber(pos, 10);
} 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;
if (codePoint >= 0) {
char high = reader.ch;
reader.scanChar();
arg = String.format("\\u%04x\\u%04x", (int) high, (int)reader.ch);
} else {
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<>(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 static 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;
}
}
}
}