org.jruby.lexer.yacc.RubyLexer Maven / Gradle / Ivy
/*
***** BEGIN LICENSE BLOCK *****
* Version: EPL 1.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Eclipse Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.eclipse.org/legal/epl-v10.html
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* Copyright (C) 2002 Benoit Cerrina
* Copyright (C) 2002-2004 Anders Bengtsson
* Copyright (C) 2002-2004 Jan Arne Petersen
* Copyright (C) 2004-2006 Thomas E Enebo
* Copyright (C) 2004 Stefan Matthias Aust
* Copyright (C) 2004-2005 David Corbin
* Copyright (C) 2005 Zach Dennis
* Copyright (C) 2006 Thomas Corbat
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the EPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the EPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****/
package org.jruby.lexer.yacc;
import java.io.IOException;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.HashMap;
import org.jcodings.Encoding;
import org.jruby.Ruby;
import org.jruby.ast.BackRefNode;
import org.jruby.ast.BignumNode;
import org.jruby.ast.ComplexNode;
import org.jruby.ast.FixnumNode;
import org.jruby.ast.FloatNode;
import org.jruby.ast.ListNode;
import org.jruby.ast.Node;
import org.jruby.ast.NthRefNode;
import org.jruby.ast.NumericNode;
import org.jruby.ast.RationalNode;
import org.jruby.ast.StrNode;
import org.jruby.common.IRubyWarnings;
import org.jruby.common.IRubyWarnings.ID;
import org.jruby.lexer.LexerSource;
import org.jruby.lexer.LexingCommon;
import org.jruby.lexer.yacc.SyntaxException.PID;
import org.jruby.parser.ParserSupport;
import org.jruby.parser.RubyParser;
import org.jruby.parser.Tokens;
import org.jruby.util.ByteList;
import org.jruby.util.SafeDoubleParser;
import org.jruby.util.StringSupport;
import org.jruby.util.cli.Options;
/*
* This is a port of the MRI lexer to Java.
*/
public class RubyLexer extends LexingCommon {
private static final HashMap map;
static {
map = new HashMap();
map.put("end", Keyword.END);
map.put("else", Keyword.ELSE);
map.put("case", Keyword.CASE);
map.put("ensure", Keyword.ENSURE);
map.put("module", Keyword.MODULE);
map.put("elsif", Keyword.ELSIF);
map.put("def", Keyword.DEF);
map.put("rescue", Keyword.RESCUE);
map.put("not", Keyword.NOT);
map.put("then", Keyword.THEN);
map.put("yield", Keyword.YIELD);
map.put("for", Keyword.FOR);
map.put("self", Keyword.SELF);
map.put("false", Keyword.FALSE);
map.put("retry", Keyword.RETRY);
map.put("return", Keyword.RETURN);
map.put("true", Keyword.TRUE);
map.put("if", Keyword.IF);
map.put("defined?", Keyword.DEFINED_P);
map.put("super", Keyword.SUPER);
map.put("undef", Keyword.UNDEF);
map.put("break", Keyword.BREAK);
map.put("in", Keyword.IN);
map.put("do", Keyword.DO);
map.put("nil", Keyword.NIL);
map.put("until", Keyword.UNTIL);
map.put("unless", Keyword.UNLESS);
map.put("or", Keyword.OR);
map.put("next", Keyword.NEXT);
map.put("when", Keyword.WHEN);
map.put("redo", Keyword.REDO);
map.put("and", Keyword.AND);
map.put("begin", Keyword.BEGIN);
map.put("__LINE__", Keyword.__LINE__);
map.put("class", Keyword.CLASS);
map.put("__FILE__", Keyword.__FILE__);
map.put("END", Keyword.LEND);
map.put("BEGIN", Keyword.LBEGIN);
map.put("while", Keyword.WHILE);
map.put("alias", Keyword.ALIAS);
map.put("__ENCODING__", Keyword.__ENCODING__);
}
private BignumNode newBignumNode(String value, int radix) {
return new BignumNode(getPosition(), new BigInteger(value, radix));
}
private FixnumNode newFixnumNode(String value, int radix) throws NumberFormatException {
return new FixnumNode(getPosition(), Long.parseLong(value, radix));
}
private RationalNode newRationalNode(String value, int radix) throws NumberFormatException {
NumericNode numerator;
try {
numerator = new FixnumNode(getPosition(), Long.parseLong(value, radix));
} catch (NumberFormatException e) {
numerator = new BignumNode(getPosition(), new BigInteger(value, radix));
}
return new RationalNode(getPosition(), numerator, new FixnumNode(getPosition(), 1));
}
private ComplexNode newComplexNode(NumericNode number) {
return new ComplexNode(getPosition(), number);
}
protected void ambiguousOperator(String op, String syn) {
warnings.warn(ID.AMBIGUOUS_ARGUMENT, getFile(), ruby_sourceline,
"`" + op + "' after local variable or literal is interpreted as binary operator");
warnings.warn(ID.AMBIGUOUS_ARGUMENT, getFile(), ruby_sourceline, "even though it seems like " + syn);
}
public enum Keyword {
END ("end", Tokens.kEND, Tokens.kEND, EXPR_END),
ELSE ("else", Tokens.kELSE, Tokens.kELSE, EXPR_BEG),
CASE ("case", Tokens.kCASE, Tokens.kCASE, EXPR_BEG),
ENSURE ("ensure", Tokens.kENSURE, Tokens.kENSURE, EXPR_BEG),
MODULE ("module", Tokens.kMODULE, Tokens.kMODULE, EXPR_BEG),
ELSIF ("elsif", Tokens.kELSIF, Tokens.kELSIF, EXPR_BEG),
DEF ("def", Tokens.kDEF, Tokens.kDEF, EXPR_FNAME),
RESCUE ("rescue", Tokens.kRESCUE, Tokens.kRESCUE_MOD, EXPR_MID),
NOT ("not", Tokens.kNOT, Tokens.kNOT, EXPR_ARG),
THEN ("then", Tokens.kTHEN, Tokens.kTHEN, EXPR_BEG),
YIELD ("yield", Tokens.kYIELD, Tokens.kYIELD, EXPR_ARG),
FOR ("for", Tokens.kFOR, Tokens.kFOR, EXPR_BEG),
SELF ("self", Tokens.kSELF, Tokens.kSELF, EXPR_END),
FALSE ("false", Tokens.kFALSE, Tokens.kFALSE, EXPR_END),
RETRY ("retry", Tokens.kRETRY, Tokens.kRETRY, EXPR_END),
RETURN ("return", Tokens.kRETURN, Tokens.kRETURN, EXPR_MID),
TRUE ("true", Tokens.kTRUE, Tokens.kTRUE, EXPR_END),
IF ("if", Tokens.kIF, Tokens.kIF_MOD, EXPR_BEG),
DEFINED_P ("defined?", Tokens.kDEFINED, Tokens.kDEFINED, EXPR_ARG),
SUPER ("super", Tokens.kSUPER, Tokens.kSUPER, EXPR_ARG),
UNDEF ("undef", Tokens.kUNDEF, Tokens.kUNDEF, EXPR_FNAME|EXPR_FITEM),
BREAK ("break", Tokens.kBREAK, Tokens.kBREAK, EXPR_MID),
IN ("in", Tokens.kIN, Tokens.kIN, EXPR_BEG),
DO ("do", Tokens.kDO, Tokens.kDO, EXPR_BEG),
NIL ("nil", Tokens.kNIL, Tokens.kNIL, EXPR_END),
UNTIL ("until", Tokens.kUNTIL, Tokens.kUNTIL_MOD, EXPR_BEG),
UNLESS ("unless", Tokens.kUNLESS, Tokens.kUNLESS_MOD, EXPR_BEG),
OR ("or", Tokens.kOR, Tokens.kOR, EXPR_BEG),
NEXT ("next", Tokens.kNEXT, Tokens.kNEXT, EXPR_MID),
WHEN ("when", Tokens.kWHEN, Tokens.kWHEN, EXPR_BEG),
REDO ("redo", Tokens.kREDO, Tokens.kREDO, EXPR_END),
AND ("and", Tokens.kAND, Tokens.kAND, EXPR_BEG),
BEGIN ("begin", Tokens.kBEGIN, Tokens.kBEGIN, EXPR_BEG),
__LINE__ ("__LINE__", Tokens.k__LINE__, Tokens.k__LINE__, EXPR_END),
CLASS ("class", Tokens.kCLASS, Tokens.kCLASS, EXPR_CLASS),
__FILE__("__FILE__", Tokens.k__FILE__, Tokens.k__FILE__, EXPR_END),
LEND ("END", Tokens.klEND, Tokens.klEND, EXPR_END),
LBEGIN ("BEGIN", Tokens.klBEGIN, Tokens.klBEGIN, EXPR_END),
WHILE ("while", Tokens.kWHILE, Tokens.kWHILE_MOD, EXPR_BEG),
ALIAS ("alias", Tokens.kALIAS, Tokens.kALIAS, EXPR_FNAME|EXPR_FITEM),
__ENCODING__("__ENCODING__", Tokens.k__ENCODING__, Tokens.k__ENCODING__, EXPR_END);
public final String name;
public final int id0;
public final int id1;
public final int state;
Keyword(String name, int id0, int id1, int state) {
this.name = name;
this.id0 = id0;
this.id1 = id1;
this.state = state;
}
}
public static Keyword getKeyword(String str) {
return (Keyword) map.get(str);
}
// Used for tiny smidgen of grammar in lexer (see setParserSupport())
private ParserSupport parserSupport = null;
// What handles warnings
private IRubyWarnings warnings;
public int tokenize_ident(int result) {
// FIXME: Get token from newtok index to lex_p?
String value = createTokenString();
if (isLexState(last_state, EXPR_DOT|EXPR_FNAME) && parserSupport.getCurrentScope().isDefined(value) >= 0) {
setState(EXPR_END);
}
yaccValue = value.intern();
return result;
}
private StrTerm lex_strterm;
public RubyLexer(ParserSupport support, LexerSource source, IRubyWarnings warnings) {
super(source);
this.parserSupport = support;
this.warnings = warnings;
reset();
}
@Deprecated
public RubyLexer(ParserSupport support, LexerSource source) {
super(source);
this.parserSupport = support;
reset();
}
public void reset() {
super.reset();
lex_strterm = null;
// FIXME: ripper offsets correctly but we need to subtract one?
ruby_sourceline = src.getLineOffset() - 1;
parser_prepare();
}
public int nextc() {
if (lex_p == lex_pend) {
line_offset += lex_pend;
ByteList v = lex_nextline;
lex_nextline = null;
if (v == null) {
if (eofp) return EOF;
if (src == null || (v = src.gets()) == null) {
eofp = true;
lex_goto_eol();
return EOF;
}
}
if (heredoc_end > 0) {
ruby_sourceline = heredoc_end;
heredoc_end = 0;
}
ruby_sourceline++;
line_count++;
lex_pbeg = lex_p = 0;
lex_pend = lex_p + v.length();
lexb = v;
flush();
lex_lastline = v;
}
int c = p(lex_p);
lex_p++;
if (c == '\r') {
if (peek('\n')) {
lex_p++;
c = '\n';
} else if (ruby_sourceline > last_cr_line) {
last_cr_line = ruby_sourceline;
warnings.warn(ID.VOID_VALUE_EXPRESSION, getFile(), ruby_sourceline, "encountered \\r in middle of line, treated as a mere space");
c = ' ';
}
}
return c;
}
public void heredoc_dedent(Node root) {
int indent = heredoc_indent;
if (indent <= 0 || root == null) return;
if (root instanceof StrNode) {
StrNode str = (StrNode) root;
dedent_string(str.getValue(), indent);
} else if (root instanceof ListNode) {
ListNode list = (ListNode) root;
int length = list.size();
int currentLine = -1;
for (int i = 0; i < length; i++) {
Node child = list.get(i);
if (currentLine == child.getLine()) continue; // Only process first element on a line?
currentLine = child.getLine(); // New line
if (child instanceof StrNode) {
dedent_string(((StrNode) child).getValue(), indent);
}
}
}
}
public void compile_error(String message) {
throw new SyntaxException(PID.BAD_HEX_NUMBER, getFile(), ruby_sourceline, lexb.toString(), message);
}
// FIXME: How does lexb.toString() vs getCurrentLine() differ.
public void compile_error(PID pid, String message) {
String src = createAsEncodedString(lex_lastline.unsafeBytes(), lex_lastline.begin(), lex_lastline.length(), getEncoding());
throw new SyntaxException(pid, getFile(), ruby_sourceline, src, message);
}
public void heredoc_restore(HeredocTerm here) {
ByteList line = here.lastLine;
lex_lastline = line;
lex_pbeg = 0;
lex_pend = lex_pbeg + line.length();
lex_p = lex_pbeg + here.nth;
lexb = line;
heredoc_end = ruby_sourceline;
ruby_sourceline = here.line;
flush();
}
public int nextToken() throws IOException {
token = yylex();
return token == EOF ? 0 : token;
}
public ISourcePosition getPosition(ISourcePosition startPosition) {
if (startPosition != null) return startPosition;
if (tokline != null && ruby_sourceline == tokline.getLine()) return tokline;
return new SimpleSourcePosition(getFile(), ruby_sourceline);
}
/**
* Parse must pass its support object for some check at bottom of
* yylex(). Ruby does it this way as well (i.e. a little parsing
* logic in the lexer).
*
* @param parserSupport
*/
public void setParserSupport(ParserSupport parserSupport) {
this.parserSupport = parserSupport;
}
@Override
protected void setCompileOptionFlag(String name, ByteList value) {
if (tokenSeen) {
warnings.warn(ID.ACCESSOR_MODULE_FUNCTION, "`" + name + "' is ignored after any tokens");
return;
}
int b = asTruth(name, value);
if (b < 0) return;
// Enebo: This is a hash in MRI for multiple potential compile options but we currently only support one.
// I am just going to set it and when a second is done we will reevaluate how they are populated.
parserSupport.getConfiguration().setFrozenStringLiteral(b == 1);
}
private final ByteList TRUE = new ByteList(new byte[] {'t', 'r', 'u', 'e'});
private final ByteList FALSE = new ByteList(new byte[] {'f', 'a', 'l', 's', 'e'});
protected int asTruth(String name, ByteList value) {
int result = value.caseInsensitiveCmp(TRUE);
if (result == 0) return 1;
result = value.caseInsensitiveCmp(FALSE);
if (result == 0) return 0;
warnings.warn(ID.ACCESSOR_MODULE_FUNCTION, "invalid value for " + name + ": " + value);
return -1;
}
@Override
protected void setTokenInfo(String name, ByteList value) {
}
protected void setEncoding(ByteList name) {
Ruby runtime = parserSupport.getConfiguration().getRuntime();
Encoding newEncoding = runtime.getEncodingService().loadEncoding(name);
if (newEncoding == null) throw runtime.newArgumentError("unknown encoding name: " + name.toString());
if (!newEncoding.isAsciiCompatible()) throw runtime.newArgumentError(name.toString() + " is not ASCII compatible");
setEncoding(newEncoding);
}
public StrTerm getStrTerm() {
return lex_strterm;
}
public void setStrTerm(StrTerm strterm) {
this.lex_strterm = strterm;
}
public void setWarnings(IRubyWarnings warnings) {
this.warnings = warnings;
}
private int considerComplex(int token, int suffix) {
if ((suffix & SUFFIX_I) == 0) {
return token;
} else {
yaccValue = newComplexNode((NumericNode) yaccValue);
return RubyParser.tIMAGINARY;
}
}
private int getFloatToken(String number, int suffix) {
if ((suffix & SUFFIX_R) != 0) {
BigDecimal bd = new BigDecimal(number);
BigDecimal denominator = BigDecimal.ONE.scaleByPowerOfTen(bd.scale());
BigDecimal numerator = bd.multiply(denominator);
try {
yaccValue = new RationalNode(getPosition(), new FixnumNode(getPosition(), numerator.longValueExact()),
new FixnumNode(getPosition(), denominator.longValueExact()));
} catch (ArithmeticException ae) {
// FIXME: Rational supports Bignum numerator and denominator
compile_error(PID.RATIONAL_OUT_OF_RANGE, "Rational (" + numerator + "/" + denominator + ") out of range.");
}
return considerComplex(Tokens.tRATIONAL, suffix);
}
double d;
try {
d = SafeDoubleParser.parseDouble(number);
} catch (NumberFormatException e) {
warnings.warn(ID.FLOAT_OUT_OF_RANGE, getFile(), ruby_sourceline, "Float " + number + " out of range.");
d = number.startsWith("-") ? Double.NEGATIVE_INFINITY : Double.POSITIVE_INFINITY;
}
yaccValue = new FloatNode(getPosition(), d);
return considerComplex(Tokens.tFLOAT, suffix);
}
private int getIntegerToken(String value, int radix, int suffix) {
Node literalValue;
if ((suffix & SUFFIX_R) != 0) {
literalValue = newRationalNode(value, radix);
} else {
try {
literalValue = newFixnumNode(value, radix);
} catch (NumberFormatException e) {
literalValue = newBignumNode(value, radix);
}
}
yaccValue = literalValue;
return considerComplex(Tokens.tINTEGER, suffix);
}
// STR_NEW3/parser_str_new
public StrNode createStr(ByteList buffer, int flags) {
Encoding bufferEncoding = buffer.getEncoding();
int codeRange = StringSupport.codeRangeScan(bufferEncoding, buffer);
if ((flags & STR_FUNC_REGEXP) == 0 && bufferEncoding.isAsciiCompatible()) {
// If we have characters outside 7-bit range and we are still ascii then change to ascii-8bit
if (codeRange == StringSupport.CR_7BIT) {
// Do nothing like MRI
} else if (getEncoding() == USASCII_ENCODING &&
bufferEncoding != UTF8_ENCODING) {
codeRange = ParserSupport.associateEncoding(buffer, ASCII8BIT_ENCODING, codeRange);
}
}
StrNode newStr = new StrNode(getPosition(), buffer, codeRange);
if (parserSupport.getConfiguration().isFrozenStringLiteral()) newStr.setFrozen(true);
return newStr;
}
/**
* What type/kind of quote are we dealing with?
*
* @param c first character the the quote construct
* @return a token that specifies the quote type
*/
private int parseQuote(int c) throws IOException {
int begin, end;
boolean shortHand;
// Short-hand (e.g. %{,%.,%!,... versus %Q{).
if (!Character.isLetterOrDigit(c)) {
begin = c;
c = 'Q';
shortHand = true;
// Long-hand (e.g. %Q{}).
} else {
shortHand = false;
begin = nextc();
if (Character.isLetterOrDigit(begin) /* no mb || ismbchar(term)*/) compile_error(PID.STRING_UNKNOWN_TYPE, "unknown type of %string");
}
if (c == EOF || begin == EOF) compile_error(PID.STRING_HITS_EOF, "unterminated quoted string meets end of file");
// Figure end-char. '\0' is special to indicate begin=end and that no nesting?
switch(begin) {
case '(': end = ')'; break;
case '[': end = ']'; break;
case '{': end = '}'; break;
case '<': end = '>'; break;
default:
end = begin;
begin = '\0';
}
switch (c) {
case 'Q':
lex_strterm = new StringTerm(str_dquote, begin ,end, ruby_sourceline);
yaccValue = "%"+ (shortHand ? (""+end) : ("" + c + begin));
return Tokens.tSTRING_BEG;
case 'q':
lex_strterm = new StringTerm(str_squote, begin, end, ruby_sourceline);
yaccValue = "%"+c+begin;
return Tokens.tSTRING_BEG;
case 'W':
lex_strterm = new StringTerm(str_dquote | STR_FUNC_QWORDS, begin, end, ruby_sourceline);
do {c = nextc();} while (Character.isWhitespace(c));
pushback(c);
yaccValue = "%"+c+begin;
return Tokens.tWORDS_BEG;
case 'w':
lex_strterm = new StringTerm(/* str_squote | */ STR_FUNC_QWORDS, begin, end, ruby_sourceline);
do {c = nextc();} while (Character.isWhitespace(c));
pushback(c);
yaccValue = "%"+c+begin;
return Tokens.tQWORDS_BEG;
case 'x':
lex_strterm = new StringTerm(str_xquote, begin, end, ruby_sourceline);
yaccValue = "%"+c+begin;
return Tokens.tXSTRING_BEG;
case 'r':
lex_strterm = new StringTerm(str_regexp, begin, end, ruby_sourceline);
yaccValue = "%"+c+begin;
return Tokens.tREGEXP_BEG;
case 's':
lex_strterm = new StringTerm(str_ssym, begin, end, ruby_sourceline);
setState(EXPR_FNAME|EXPR_FITEM);
yaccValue = "%"+c+begin;
return Tokens.tSYMBEG;
case 'I':
lex_strterm = new StringTerm(str_dquote | STR_FUNC_QWORDS, begin, end, ruby_sourceline);
do {c = nextc();} while (Character.isWhitespace(c));
pushback(c);
yaccValue = "%" + c + begin;
return Tokens.tSYMBOLS_BEG;
case 'i':
lex_strterm = new StringTerm(/* str_squote | */STR_FUNC_QWORDS, begin, end, ruby_sourceline);
do {c = nextc();} while (Character.isWhitespace(c));
pushback(c);
yaccValue = "%" + c + begin;
return Tokens.tQSYMBOLS_BEG;
default:
compile_error(PID.STRING_UNKNOWN_TYPE, "unknown type of %string");
}
return -1; // not-reached
}
private int hereDocumentIdentifier() throws IOException {
int c = nextc();
int term;
int func = 0;
if (c == '-') {
c = nextc();
func = STR_FUNC_INDENT;
} else if (c == '~') {
c = nextc();
func = STR_FUNC_INDENT;
heredoc_indent = Integer.MAX_VALUE;
heredoc_line_indent = 0;
}
ByteList markerValue;
if (c == '\'' || c == '"' || c == '`') {
if (c == '\'') {
func |= str_squote;
} else if (c == '"') {
func |= str_dquote;
} else {
func |= str_xquote;
}
newtok(false); // skip past quote type
term = c;
while ((c = nextc()) != EOF && c != term) {
if (!tokadd_mbchar(c)) return EOF;
}
if (c == EOF) compile_error("unterminated here document identifier");
// c == term. This differs from MRI in that we unwind term symbol so we can make
// our marker with just tokp and lex_p info (e.g. we don't make second numberBuffer).
pushback(term);
markerValue = createTokenByteList();
nextc();
} else {
if (!isIdentifierChar(c)) {
pushback(c);
if ((func & STR_FUNC_INDENT) != 0) {
pushback(heredoc_indent > 0 ? '~' : '-');
}
return 0;
}
newtok(true);
term = '"';
func |= str_dquote;
do {
if (!tokadd_mbchar(c)) return EOF;
} while ((c = nextc()) != EOF && isIdentifierChar(c));
pushback(c);
markerValue = createTokenByteList();
}
int len = lex_p - lex_pbeg;
lex_goto_eol();
lex_strterm = new HeredocTerm(markerValue, func, len, ruby_sourceline, lex_lastline);
if (term == '`') {
yaccValue = "`";
flush();
return Tokens.tXSTRING_BEG;
}
yaccValue = "\"";
flush();
return Tokens.tSTRING_BEG;
}
private boolean arg_ambiguous() {
if (warnings.isVerbose() && Options.PARSER_WARN_AMBIGUOUS_ARGUMENTS.load()) {
warnings.warning(ID.AMBIGUOUS_ARGUMENT, getFile(), ruby_sourceline, "Ambiguous first argument; make sure.");
}
return true;
}
/*
* Not normally used, but is left in here since it can be useful in debugging
* grammar and lexing problems.
*
*/
private void printToken(int token) {
//System.out.print("LOC: " + support.getPosition() + " ~ ");
switch (token) {
case Tokens.yyErrorCode: System.err.print("yyErrorCode,"); break;
case Tokens.kCLASS: System.err.print("kClass,"); break;
case Tokens.kMODULE: System.err.print("kModule,"); break;
case Tokens.kDEF: System.err.print("kDEF,"); break;
case Tokens.kUNDEF: System.err.print("kUNDEF,"); break;
case Tokens.kBEGIN: System.err.print("kBEGIN,"); break;
case Tokens.kRESCUE: System.err.print("kRESCUE,"); break;
case Tokens.kENSURE: System.err.print("kENSURE,"); break;
case Tokens.kEND: System.err.print("kEND,"); break;
case Tokens.kIF: System.err.print("kIF,"); break;
case Tokens.kUNLESS: System.err.print("kUNLESS,"); break;
case Tokens.kTHEN: System.err.print("kTHEN,"); break;
case Tokens.kELSIF: System.err.print("kELSIF,"); break;
case Tokens.kELSE: System.err.print("kELSE,"); break;
case Tokens.kCASE: System.err.print("kCASE,"); break;
case Tokens.kWHEN: System.err.print("kWHEN,"); break;
case Tokens.kWHILE: System.err.print("kWHILE,"); break;
case Tokens.kUNTIL: System.err.print("kUNTIL,"); break;
case Tokens.kFOR: System.err.print("kFOR,"); break;
case Tokens.kBREAK: System.err.print("kBREAK,"); break;
case Tokens.kNEXT: System.err.print("kNEXT,"); break;
case Tokens.kREDO: System.err.print("kREDO,"); break;
case Tokens.kRETRY: System.err.print("kRETRY,"); break;
case Tokens.kIN: System.err.print("kIN,"); break;
case Tokens.kDO: System.err.print("kDO,"); break;
case Tokens.kDO_COND: System.err.print("kDO_COND,"); break;
case Tokens.kDO_BLOCK: System.err.print("kDO_BLOCK,"); break;
case Tokens.kRETURN: System.err.print("kRETURN,"); break;
case Tokens.kYIELD: System.err.print("kYIELD,"); break;
case Tokens.kSUPER: System.err.print("kSUPER,"); break;
case Tokens.kSELF: System.err.print("kSELF,"); break;
case Tokens.kNIL: System.err.print("kNIL,"); break;
case Tokens.kTRUE: System.err.print("kTRUE,"); break;
case Tokens.kFALSE: System.err.print("kFALSE,"); break;
case Tokens.kAND: System.err.print("kAND,"); break;
case Tokens.kOR: System.err.print("kOR,"); break;
case Tokens.kNOT: System.err.print("kNOT,"); break;
case Tokens.kIF_MOD: System.err.print("kIF_MOD,"); break;
case Tokens.kUNLESS_MOD: System.err.print("kUNLESS_MOD,"); break;
case Tokens.kWHILE_MOD: System.err.print("kWHILE_MOD,"); break;
case Tokens.kUNTIL_MOD: System.err.print("kUNTIL_MOD,"); break;
case Tokens.kRESCUE_MOD: System.err.print("kRESCUE_MOD,"); break;
case Tokens.kALIAS: System.err.print("kALIAS,"); break;
case Tokens.kDEFINED: System.err.print("kDEFINED,"); break;
case Tokens.klBEGIN: System.err.print("klBEGIN,"); break;
case Tokens.klEND: System.err.print("klEND,"); break;
case Tokens.k__LINE__: System.err.print("k__LINE__,"); break;
case Tokens.k__FILE__: System.err.print("k__FILE__,"); break;
case Tokens.k__ENCODING__: System.err.print("k__ENCODING__,"); break;
case Tokens.kDO_LAMBDA: System.err.print("kDO_LAMBDA,"); break;
case Tokens.tIDENTIFIER: System.err.print("tIDENTIFIER["+ value() + "],"); break;
case Tokens.tFID: System.err.print("tFID[" + value() + "],"); break;
case Tokens.tGVAR: System.err.print("tGVAR[" + value() + "],"); break;
case Tokens.tIVAR: System.err.print("tIVAR[" + value() +"],"); break;
case Tokens.tCONSTANT: System.err.print("tCONSTANT["+ value() +"],"); break;
case Tokens.tCVAR: System.err.print("tCVAR,"); break;
case Tokens.tINTEGER: System.err.print("tINTEGER,"); break;
case Tokens.tFLOAT: System.err.print("tFLOAT,"); break;
case Tokens.tSTRING_CONTENT: System.err.print("tSTRING_CONTENT[" + ((StrNode) value()).getValue() + "],"); break;
case Tokens.tSTRING_BEG: System.err.print("tSTRING_BEG,"); break;
case Tokens.tSTRING_END: System.err.print("tSTRING_END,"); break;
case Tokens.tSTRING_DBEG: System.err.print("tSTRING_DBEG,"); break;
case Tokens.tSTRING_DVAR: System.err.print("tSTRING_DVAR,"); break;
case Tokens.tXSTRING_BEG: System.err.print("tXSTRING_BEG,"); break;
case Tokens.tREGEXP_BEG: System.err.print("tREGEXP_BEG,"); break;
case Tokens.tREGEXP_END: System.err.print("tREGEXP_END,"); break;
case Tokens.tWORDS_BEG: System.err.print("tWORDS_BEG,"); break;
case Tokens.tQWORDS_BEG: System.err.print("tQWORDS_BEG,"); break;
case Tokens.tBACK_REF: System.err.print("tBACK_REF,"); break;
case Tokens.tBACK_REF2: System.err.print("tBACK_REF2,"); break;
case Tokens.tNTH_REF: System.err.print("tNTH_REF,"); break;
case Tokens.tUPLUS: System.err.print("tUPLUS"); break;
case Tokens.tUMINUS: System.err.print("tUMINUS,"); break;
case Tokens.tPOW: System.err.print("tPOW,"); break;
case Tokens.tCMP: System.err.print("tCMP,"); break;
case Tokens.tEQ: System.err.print("tEQ,"); break;
case Tokens.tEQQ: System.err.print("tEQQ,"); break;
case Tokens.tNEQ: System.err.print("tNEQ,"); break;
case Tokens.tGEQ: System.err.print("tGEQ,"); break;
case Tokens.tLEQ: System.err.print("tLEQ,"); break;
case Tokens.tANDOP: System.err.print("tANDOP,"); break;
case Tokens.tOROP: System.err.print("tOROP,"); break;
case Tokens.tMATCH: System.err.print("tMATCH,"); break;
case Tokens.tNMATCH: System.err.print("tNMATCH,"); break;
case Tokens.tDOT: System.err.print("tDOT,"); break;
case Tokens.tDOT2: System.err.print("tDOT2,"); break;
case Tokens.tDOT3: System.err.print("tDOT3,"); break;
case Tokens.tAREF: System.err.print("tAREF,"); break;
case Tokens.tASET: System.err.print("tASET,"); break;
case Tokens.tLSHFT: System.err.print("tLSHFT,"); break;
case Tokens.tRSHFT: System.err.print("tRSHFT,"); break;
case Tokens.tCOLON2: System.err.print("tCOLON2,"); break;
case Tokens.tCOLON3: System.err.print("tCOLON3,"); break;
case Tokens.tOP_ASGN: System.err.print("tOP_ASGN,"); break;
case Tokens.tASSOC: System.err.print("tASSOC,"); break;
case Tokens.tLPAREN: System.err.print("tLPAREN,"); break;
case Tokens.tLPAREN2: System.err.print("tLPAREN2,"); break;
case Tokens.tLPAREN_ARG: System.err.print("tLPAREN_ARG,"); break;
case Tokens.tLBRACK: System.err.print("tLBRACK,"); break;
case Tokens.tRBRACK: System.err.print("tRBRACK,"); break;
case Tokens.tLBRACE: System.err.print("tLBRACE,"); break;
case Tokens.tLBRACE_ARG: System.err.print("tLBRACE_ARG,"); break;
case Tokens.tSTAR: System.err.print("tSTAR,"); break;
case Tokens.tSTAR2: System.err.print("tSTAR2,"); break;
case Tokens.tAMPER: System.err.print("tAMPER,"); break;
case Tokens.tAMPER2: System.err.print("tAMPER2,"); break;
case Tokens.tSYMBEG: System.err.print("tSYMBEG,"); break;
case Tokens.tTILDE: System.err.print("tTILDE,"); break;
case Tokens.tPERCENT: System.err.print("tPERCENT,"); break;
case Tokens.tDIVIDE: System.err.print("tDIVIDE,"); break;
case Tokens.tPLUS: System.err.print("tPLUS,"); break;
case Tokens.tMINUS: System.err.print("tMINUS,"); break;
case Tokens.tLT: System.err.print("tLT,"); break;
case Tokens.tGT: System.err.print("tGT,"); break;
case Tokens.tCARET: System.err.print("tCARET,"); break;
case Tokens.tBANG: System.err.print("tBANG,"); break;
case Tokens.tLCURLY: System.err.print("tTLCURLY,"); break;
case Tokens.tRCURLY: System.err.print("tRCURLY,"); break;
case Tokens.tPIPE: System.err.print("tTPIPE,"); break;
case Tokens.tLAMBDA: System.err.print("tLAMBDA,"); break;
case Tokens.tLAMBEG: System.err.print("tLAMBEG,"); break;
case Tokens.tRPAREN: System.err.print("tRPAREN,"); break;
case Tokens.tLABEL: System.err.print("tLABEL("+ value() +":),"); break;
case Tokens.tLABEL_END: System.err.print("tLABEL_END"); break;
case '\n': System.err.println("NL"); break;
case EOF: System.out.println("EOF"); break;
case Tokens.tDSTAR: System.err.print("tDSTAR"); break;
default: System.err.print("'" + (char)token + "',"); break;
}
}
// DEBUGGING HELP
private int yylex2() throws IOException {
int currentToken = yylex2();
printToken(currentToken);
return currentToken;
}
/**
* Returns the next token. Also sets yyVal is needed.
*
*@return Description of the Returned Value
*/
private int yylex() throws IOException {
int c;
boolean spaceSeen = false;
boolean commandState;
boolean tokenSeen = this.tokenSeen;
if (lex_strterm != null) {
int tok = lex_strterm.parseString(this);
if (tok == Tokens.tSTRING_END && (lex_strterm.getFlags() & STR_FUNC_LABEL) != 0) {
if ((isLexState(lex_state, EXPR_BEG|EXPR_ENDFN) && !conditionState.isInState() ||
isARG()) && isLabelSuffix()) {
nextc();
tok = Tokens.tLABEL_END;
setState(EXPR_BEG|EXPR_LABEL);
lex_strterm = null;
}
}
if (tok == Tokens.tSTRING_END || tok == Tokens.tREGEXP_END) {
lex_strterm = null;
setState(EXPR_END);
}
return tok;
}
commandState = commandStart;
commandStart = false;
this.tokenSeen = true;
loop: for(;;) {
last_state = lex_state;
c = nextc();
switch(c) {
case '\000': /* NUL */
case '\004': /* ^D */
case '\032': /* ^Z */
case EOF: /* end of script. */
return EOF;
/* white spaces */
case ' ': case '\t': case '\f': case '\r':
case '\13': /* '\v' */
getPosition();
spaceSeen = true;
continue;
case '#': { /* it's a comment */
this.tokenSeen = tokenSeen;
if (!parseMagicComment(parserSupport.getConfiguration().getRuntime(), lexb.makeShared(lex_p, lex_pend - lex_p))) {
if (comment_at_top()) set_file_encoding(lex_p, lex_pend);
}
lex_p = lex_pend;
}
/* fall through */
case '\n': {
this.tokenSeen = tokenSeen;
boolean normalArg = isLexState(lex_state, EXPR_BEG | EXPR_CLASS | EXPR_FNAME | EXPR_DOT) &&
!isLexState(lex_state, EXPR_LABELED);
if (normalArg || isLexStateAll(lex_state, EXPR_ARG | EXPR_LABELED)) {
if (!normalArg && inKwarg) {
commandStart = true;
setState(EXPR_BEG);
return '\n';
}
continue loop;
}
boolean done = false;
while (!done) {
c = nextc();
switch (c) {
case ' ': case '\t': case '\f': case '\r': case '\13': /* '\v' */
spaceSeen = true;
continue;
case '&':
case '.': {
if (peek('.') == (c == '&')) {
pushback(c);
continue loop;
}
}
default:
case -1: // EOF (ENEBO: After default?
done = true;
}
}
if (c == -1) return EOF;
pushback(c);
getPosition();
commandStart = true;
setState(EXPR_BEG);
return '\n';
}
case '*':
return star(spaceSeen);
case '!':
return bang();
case '=':
// documentation nodes
if (was_bol()) {
if (strncmp(lexb.makeShared(lex_p, lex_pend - lex_p), BEGIN_DOC_MARKER, BEGIN_DOC_MARKER.length()) &&
Character.isWhitespace(p(lex_p + 5))) {
for (;;) {
lex_goto_eol();
c = nextc();
if (c == EOF) {
compile_error("embedded document meets end of file");
return EOF;
}
if (c != '=') continue;
if (strncmp(lexb.makeShared(lex_p, lex_pend - lex_p), END_DOC_MARKER, END_DOC_MARKER.length()) &&
(lex_p + 3 == lex_pend || Character.isWhitespace(p(lex_p + 3)))) {
break;
}
}
lex_goto_eol();
continue loop;
}
}
setState(isAfterOperator() ? EXPR_ARG : EXPR_BEG);
c = nextc();
if (c == '=') {
c = nextc();
if (c == '=') {
yaccValue = "===";
return Tokens.tEQQ;
}
pushback(c);
yaccValue = "==";
return Tokens.tEQ;
}
if (c == '~') {
yaccValue = "=~";
return Tokens.tMATCH;
} else if (c == '>') {
yaccValue = "=>";
return Tokens.tASSOC;
}
pushback(c);
yaccValue = "=";
return '=';
case '<':
return lessThan(spaceSeen);
case '>':
return greaterThan();
case '"':
return doubleQuote(commandState);
case '`':
return backtick(commandState);
case '\'':
return singleQuote(commandState);
case '?':
return questionMark();
case '&':
return ampersand(spaceSeen);
case '|':
return pipe();
case '+':
return plus(spaceSeen);
case '-':
return minus(spaceSeen);
case '.':
return dot();
case '0' : case '1' : case '2' : case '3' : case '4' :
case '5' : case '6' : case '7' : case '8' : case '9' :
return parseNumber(c);
case ')':
return rightParen();
case ']':
return rightBracket();
case '}':
return rightCurly();
case ':':
return colon(spaceSeen);
case '/':
return slash(spaceSeen);
case '^':
return caret();
case ';':
commandStart = true;
setState(EXPR_BEG);
yaccValue = ";";
return ';';
case ',':
return comma(c);
case '~':
return tilde();
case '(':
return leftParen(spaceSeen);
case '[':
return leftBracket(spaceSeen);
case '{':
return leftCurly();
case '\\':
c = nextc();
if (c == '\n') {
spaceSeen = true;
continue;
}
pushback(c);
yaccValue = "\\";
return '\\';
case '%':
return percent(spaceSeen);
case '$':
return dollar();
case '@':
return at();
case '_':
if (was_bol() && whole_match_p(END_MARKER, false)) {
line_offset += lex_pend;
__end__seen = true;
eofp = true;
lex_goto_eol();
return EOF;
}
return identifier(c, commandState);
default:
return identifier(c, commandState);
}
}
}
private int identifierToken(int result, String value) {
if (result == Tokens.tIDENTIFIER && !isLexState(last_state, EXPR_DOT|EXPR_FNAME) &&
parserSupport.getCurrentScope().isDefined(value) >= 0) {
setState(EXPR_END|EXPR_LABEL);
}
yaccValue = value;
return result;
}
private int ampersand(boolean spaceSeen) throws IOException {
int c = nextc();
switch (c) {
case '&':
setState(EXPR_BEG);
if ((c = nextc()) == '=') {
yaccValue = "&&";
setState(EXPR_BEG);
return Tokens.tOP_ASGN;
}
pushback(c);
yaccValue = "&&";
return Tokens.tANDOP;
case '=':
yaccValue = "&";
setState(EXPR_BEG);
return Tokens.tOP_ASGN;
case '.':
setState(EXPR_DOT);
yaccValue = "&.";
return Tokens.tANDDOT;
}
pushback(c);
//tmpPosition is required because getPosition()'s side effects.
//if the warning is generated, the getPosition() on line 954 (this line + 18) will create
//a wrong position if the "inclusive" flag is not set.
ISourcePosition tmpPosition = getPosition();
if (isSpaceArg(c, spaceSeen)) {
if (warnings.isVerbose() && Options.PARSER_WARN_ARGUMENT_PREFIX.load())
warnings.warning(ID.ARGUMENT_AS_PREFIX, getFile(), tmpPosition.getLine(), "`&' interpreted as argument prefix");
c = Tokens.tAMPER;
} else if (isBEG()) {
c = Tokens.tAMPER;
} else {
warn_balanced(c, spaceSeen, "&", "argument prefix");
c = Tokens.tAMPER2;
}
setState(isAfterOperator() ? EXPR_ARG : EXPR_BEG);
yaccValue = "&";
return c;
}
private int at() throws IOException {
newtok(true);
int c = nextc();
int result;
if (c == '@') {
c = nextc();
result = Tokens.tCVAR;
} else {
result = Tokens.tIVAR;
}
if (c == EOF || Character.isSpaceChar(c)) {
if (result == Tokens.tIVAR) {
compile_error("`@' without identifiers is not allowed as an instance variable name");
}
compile_error("`@@' without identifiers is not allowed as a class variable name");
} else if (Character.isDigit(c) || !isIdentifierChar(c)) {
pushback(c);
if (result == Tokens.tIVAR) {
compile_error(PID.IVAR_BAD_NAME, "`@" + ((char) c) + "' is not allowed as an instance variable name");
}
compile_error(PID.CVAR_BAD_NAME, "`@@" + ((char) c) + "' is not allowed as a class variable name");
}
if (!tokadd_ident(c)) return EOF;
last_state = lex_state;
setState(EXPR_END);
return tokenize_ident(result);
}
private int backtick(boolean commandState) throws IOException {
yaccValue = "`";
if (isLexState(lex_state, EXPR_FNAME)) {
setState(EXPR_ENDFN);
return Tokens.tBACK_REF2;
}
if (isLexState(lex_state, EXPR_DOT)) {
setState(commandState ? EXPR_CMDARG : EXPR_ARG);
return Tokens.tBACK_REF2;
}
lex_strterm = new StringTerm(str_xquote, '\0', '`', ruby_sourceline);
return Tokens.tXSTRING_BEG;
}
private int bang() throws IOException {
int c = nextc();
if (isAfterOperator()) {
setState(EXPR_ARG);
if (c == '@') {
yaccValue = "!";
return Tokens.tBANG;
}
} else {
setState(EXPR_BEG);
}
switch (c) {
case '=':
yaccValue = "!=";
return Tokens.tNEQ;
case '~':
yaccValue = "!~";
return Tokens.tNMATCH;
default: // Just a plain bang
pushback(c);
yaccValue = "!";
return Tokens.tBANG;
}
}
private int caret() throws IOException {
int c = nextc();
if (c == '=') {
setState(EXPR_BEG);
yaccValue = "^";
return Tokens.tOP_ASGN;
}
setState(isAfterOperator() ? EXPR_ARG : EXPR_BEG);
pushback(c);
yaccValue = "^";
return Tokens.tCARET;
}
private int colon(boolean spaceSeen) throws IOException {
int c = nextc();
if (c == ':') {
if (isBEG() || isLexState(lex_state, EXPR_CLASS) || (isARG() && spaceSeen)) {
setState(EXPR_BEG);
yaccValue = "::";
return Tokens.tCOLON3;
}
setState(EXPR_DOT);
yaccValue = ":";
return Tokens.tCOLON2;
}
if (isEND() || Character.isWhitespace(c) || c == '#') {
pushback(c);
setState(EXPR_BEG);
yaccValue = ":";
warn_balanced(c, spaceSeen, ":", "symbol literal");
return ':';
}
switch (c) {
case '\'':
lex_strterm = new StringTerm(str_ssym, '\0', c, ruby_sourceline);
break;
case '"':
lex_strterm = new StringTerm(str_dsym, '\0', c, ruby_sourceline);
break;
default:
pushback(c);
break;
}
setState(EXPR_FNAME);
yaccValue = ":";
return Tokens.tSYMBEG;
}
private int comma(int c) throws IOException {
setState(EXPR_BEG|EXPR_LABEL);
yaccValue = ",";
return c;
}
private int doKeyword(int state) {
int leftParenBegin = getLeftParenBegin();
if (leftParenBegin > 0 && leftParenBegin == parenNest) {
setLeftParenBegin(0);
parenNest--;
return Tokens.kDO_LAMBDA;
}
if (conditionState.isInState()) return Tokens.kDO_COND;
if (cmdArgumentState.isInState() && !isLexState(state, EXPR_CMDARG)) {
return Tokens.kDO_BLOCK;
}
if (isLexState(state, EXPR_BEG|EXPR_ENDARG)) {
return Tokens.kDO_BLOCK;
}
return Tokens.kDO;
}
private int dollar() throws IOException {
setState(EXPR_END);
newtok(true);
int c = nextc();
switch (c) {
case '_': /* $_: last read line string */
c = nextc();
if (isIdentifierChar(c)) {
if (!tokadd_ident(c)) return EOF;
last_state = lex_state;
setState(EXPR_END);
yaccValue = createTokenString().intern();
return Tokens.tGVAR;
}
pushback(c);
c = '_';
// fall through
case '~': /* $~: match-data */
case '*': /* $*: argv */
case '$': /* $$: pid */
case '?': /* $?: last status */
case '!': /* $!: error string */
case '@': /* $@: error position */
case '/': /* $/: input record separator */
case '\\': /* $\: output record separator */
case ';': /* $;: field separator */
case ',': /* $,: output field separator */
case '.': /* $.: last read line number */
case '=': /* $=: ignorecase */
case ':': /* $:: load path */
case '<': /* $<: reading filename */
case '>': /* $>: default output handle */
case '\"': /* $": already loaded files */
yaccValue = "$" + (char) c;
return Tokens.tGVAR;
case '-':
c = nextc();
if (isIdentifierChar(c)) {
if (!tokadd_mbchar(c)) return EOF;
} else {
pushback(c);
pushback('-');
return '$';
}
yaccValue = createTokenString().intern();
/* xxx shouldn't check if valid option variable */
return Tokens.tGVAR;
case '&': /* $&: last match */
case '`': /* $`: string before last match */
case '\'': /* $': string after last match */
case '+': /* $+: string matches last paren. */
// Explicit reference to these vars as symbols...
if (isLexState(last_state, EXPR_FNAME)) {
yaccValue = "$" + (char) c;
return Tokens.tGVAR;
}
yaccValue = new BackRefNode(getPosition(), c);
return Tokens.tBACK_REF;
case '1': case '2': case '3': case '4': case '5': case '6':
case '7': case '8': case '9':
do {
c = nextc();
} while (Character.isDigit(c));
pushback(c);
if (isLexState(last_state, EXPR_FNAME)) {
yaccValue = createTokenString().intern();
return Tokens.tGVAR;
}
int ref;
String refAsString = createTokenString();
try {
ref = Integer.parseInt(refAsString.substring(1).intern());
} catch (NumberFormatException e) {
warnings.warn(ID.AMBIGUOUS_ARGUMENT, "`" + refAsString + "' is too big for a number variable, always nil");
ref = 0;
}
yaccValue = new NthRefNode(getPosition(), ref);
return Tokens.tNTH_REF;
case '0':
setState(EXPR_END);
return identifierToken(Tokens.tGVAR, ("$" + (char) c).intern());
default:
if (!isIdentifierChar(c)) {
if (c == EOF || Character.isSpaceChar(c)) {
compile_error(PID.CVAR_BAD_NAME, "`$' without identifiers is not allowed as a global variable name");
} else {
pushback(c);
compile_error(PID.CVAR_BAD_NAME, "`$" + ((char) c) + "' is not allowed as a global variable name");
}
}
last_state = lex_state;
setState(EXPR_END);
tokadd_ident(c);
return identifierToken(Tokens.tGVAR, createTokenString().intern()); // $blah
}
}
private int dot() throws IOException {
int c;
setState(EXPR_BEG);
if ((c = nextc()) == '.') {
if ((c = nextc()) == '.') {
yaccValue = "...";
return Tokens.tDOT3;
}
pushback(c);
yaccValue = "..";
return Tokens.tDOT2;
}
pushback(c);
if (Character.isDigit(c)) compile_error(PID.FLOAT_MISSING_ZERO, "no . floating literal anymore; put 0 before dot");
setState(EXPR_DOT);
yaccValue = ".";
return Tokens.tDOT;
}
private int doubleQuote(boolean commandState) throws IOException {
int label = isLabelPossible(commandState) ? str_label : 0;
lex_strterm = new StringTerm(str_dquote|label, '\0', '"', ruby_sourceline);
yaccValue = "\"";
return Tokens.tSTRING_BEG;
}
private int greaterThan() throws IOException {
setState(isAfterOperator() ? EXPR_ARG : EXPR_BEG);
int c = nextc();
switch (c) {
case '=':
yaccValue = ">=";
return Tokens.tGEQ;
case '>':
if ((c = nextc()) == '=') {
setState(EXPR_BEG);
yaccValue = ">>";
return Tokens.tOP_ASGN;
}
pushback(c);
yaccValue = ">>";
return Tokens.tRSHFT;
default:
pushback(c);
yaccValue = ">";
return Tokens.tGT;
}
}
private int identifier(int c, boolean commandState) throws IOException {
if (!isIdentifierChar(c)) {
String badChar = "\\" + Integer.toOctalString(c & 0xff);
compile_error(PID.CHARACTER_BAD, "Invalid char `" + badChar + "' ('" + (char) c + "') in expression");
}
newtok(true);
do {
if (!tokadd_mbchar(c)) return EOF;
c = nextc();
} while (isIdentifierChar(c));
boolean lastBangOrPredicate = false;
// methods 'foo!' and 'foo?' are possible but if followed by '=' it is relop
if (c == '!' || c == '?') {
if (!peek('=')) {
lastBangOrPredicate = true;
} else {
pushback(c);
}
} else {
pushback(c);
}
int result = 0;
last_state = lex_state;
String tempVal;
if (lastBangOrPredicate) {
result = Tokens.tFID;
tempVal = createTokenString();
} else {
if (isLexState(lex_state, EXPR_FNAME)) {
if ((c = nextc()) == '=') {
int c2 = nextc();
if (c2 != '~' && c2 != '>' &&
(c2 != '=' || peek('>'))) {
result = Tokens.tIDENTIFIER;
pushback(c2);
} else {
pushback(c2);
pushback(c);
}
} else {
pushback(c);
}
}
tempVal = createTokenString();
if (result == 0 && Character.isUpperCase(tempVal.charAt(0))) {
result = Tokens.tCONSTANT;
} else {
result = Tokens.tIDENTIFIER;
}
}
if (isLabelPossible(commandState)) {
if (isLabelSuffix()) {
setState(EXPR_ARG|EXPR_LABELED);
nextc();
yaccValue = tempVal.intern();
return Tokens.tLABEL;
}
}
if (lex_state != EXPR_DOT) {
Keyword keyword = getKeyword(tempVal); // Is it is a keyword?
if (keyword != null) {
int state = lex_state; // Save state at time keyword is encountered
setState(keyword.state);
if (isLexState(state, EXPR_FNAME)) {
yaccValue = keyword.name;
return keyword.id0;
} else {
yaccValue = getPosition();
}
if (isLexState(lex_state, EXPR_BEG)) commandStart = true;
if (keyword.id0 == Tokens.kDO) return doKeyword(state);
if (isLexState(state, EXPR_BEG|EXPR_LABELED)) {
return keyword.id0;
} else {
if (keyword.id0 != keyword.id1) setState(EXPR_BEG|EXPR_LABEL);
return keyword.id1;
}
}
}
if (isLexState(lex_state, EXPR_BEG_ANY|EXPR_ARG_ANY|EXPR_DOT)) {
setState(commandState ? EXPR_CMDARG : EXPR_ARG);
} else if (lex_state == EXPR_FNAME) {
setState(EXPR_ENDFN);
} else {
setState(EXPR_END);
}
return identifierToken(result, tempVal.intern());
}
private int leftBracket(boolean spaceSeen) throws IOException {
parenNest++;
int c = '[';
if (isAfterOperator()) {
setState(EXPR_ARG);
if ((c = nextc()) == ']') {
if (peek('=')) {
nextc();
yaccValue = "[]=";
return Tokens.tASET;
}
yaccValue = "[]";
return Tokens.tAREF;
}
pushback(c);
setState(getState() | EXPR_LABEL);
yaccValue = "[";
return '[';
} else if (isBEG() || (isARG() && (spaceSeen || isLexState(lex_state, EXPR_LABELED)))) {
c = Tokens.tLBRACK;
}
setState(EXPR_BEG|EXPR_LABEL);
conditionState.stop();
cmdArgumentState.stop();
yaccValue = "[";
return c;
}
private int leftCurly() {
braceNest++;
int leftParenBegin = getLeftParenBegin();
if (leftParenBegin > 0 && leftParenBegin == parenNest) {
setState(EXPR_BEG);
setLeftParenBegin(0);
parenNest--;
conditionState.stop();
cmdArgumentState.stop();
yaccValue = "{";
return Tokens.tLAMBEG;
}
char c;
if (isLexState(lex_state, EXPR_LABELED)) {
c = Tokens.tLBRACE;
} else if (isLexState(lex_state, EXPR_ARG_ANY|EXPR_END|EXPR_ENDFN)) { // block (primary)
c = Tokens.tLCURLY;
} else if (isLexState(lex_state, EXPR_ENDARG)) { // block (expr)
c = Tokens.tLBRACE_ARG;
} else { // hash
c = Tokens.tLBRACE;
}
conditionState.stop();
cmdArgumentState.stop();
setState(EXPR_BEG);
if (c != Tokens.tLBRACE_ARG) setState(getState() | EXPR_LABEL);
if (c != Tokens.tLBRACE) commandStart = true;
yaccValue = getPosition();
return c;
}
private int leftParen(boolean spaceSeen) throws IOException {
int result;
if (isBEG()) {
result = Tokens.tLPAREN;
} else if (isSpaceArg('(', spaceSeen)) {
result = Tokens.tLPAREN_ARG;
} else {
result = Tokens.tLPAREN2;
}
parenNest++;
conditionState.stop();
cmdArgumentState.stop();
setState(EXPR_BEG|EXPR_LABEL);
yaccValue = getPosition();
return result;
}
private int lessThan(boolean spaceSeen) throws IOException {
last_state = lex_state;
int c = nextc();
if (c == '<' && !isLexState(lex_state, EXPR_DOT|EXPR_CLASS) &&
!isEND() && (!isARG() || isLexState(lex_state, EXPR_LABELED) || spaceSeen)) {
int tok = hereDocumentIdentifier();
if (tok != 0) return tok;
}
if (isAfterOperator()) {
setState(EXPR_ARG);
} else {
if (isLexState(lex_state, EXPR_CLASS)) commandStart = true;
setState(EXPR_BEG);
}
switch (c) {
case '=':
if ((c = nextc()) == '>') {
yaccValue = "<=>";
return Tokens.tCMP;
}
pushback(c);
yaccValue = "<=";
return Tokens.tLEQ;
case '<':
if ((c = nextc()) == '=') {
setState(EXPR_BEG);
yaccValue = "<<";
return Tokens.tOP_ASGN;
}
pushback(c);
yaccValue = "<<";
warn_balanced(c, spaceSeen, "<<", "here document");
return Tokens.tLSHFT;
default:
yaccValue = "<";
pushback(c);
return Tokens.tLT;
}
}
private int minus(boolean spaceSeen) throws IOException {
int c = nextc();
if (isAfterOperator()) {
setState(EXPR_ARG);
if (c == '@') {
yaccValue = "-@";
return Tokens.tUMINUS;
}
pushback(c);
yaccValue = "-";
return Tokens.tMINUS;
}
if (c == '=') {
setState(EXPR_BEG);
yaccValue = "-";
return Tokens.tOP_ASGN;
}
if (c == '>') {
setState(EXPR_ENDFN);
yaccValue = "->";
return Tokens.tLAMBDA;
}
if (isBEG() || (isSpaceArg(c, spaceSeen) && arg_ambiguous())) {
setState(EXPR_BEG);
pushback(c);
yaccValue = "-";
if (Character.isDigit(c)) {
return Tokens.tUMINUS_NUM;
}
return Tokens.tUMINUS;
}
setState(EXPR_BEG);
pushback(c);
yaccValue = "-";
warn_balanced(c, spaceSeen, "-", "unary operator");
return Tokens.tMINUS;
}
private int percent(boolean spaceSeen) throws IOException {
if (isBEG()) return parseQuote(nextc());
int c = nextc();
if (c == '=') {
setState(EXPR_BEG);
yaccValue = "%";
return Tokens.tOP_ASGN;
}
if (isSpaceArg(c, spaceSeen) || (isLexState(lex_state, EXPR_FITEM) && c == 's')) return parseQuote(c);
setState(isAfterOperator() ? EXPR_ARG : EXPR_BEG);
pushback(c);
yaccValue = "%";
warn_balanced(c, spaceSeen, "%", "string literal");
return Tokens.tPERCENT;
}
private int pipe() throws IOException {
int c = nextc();
switch (c) {
case '|':
setState(EXPR_BEG);
if ((c = nextc()) == '=') {
setState(EXPR_BEG);
yaccValue = "||";
return Tokens.tOP_ASGN;
}
pushback(c);
yaccValue = "||";
return Tokens.tOROP;
case '=':
setState(EXPR_BEG);
yaccValue = "|";
return Tokens.tOP_ASGN;
default:
setState(isAfterOperator() ? EXPR_ARG : EXPR_BEG|EXPR_LABEL);
pushback(c);
yaccValue = "|";
return Tokens.tPIPE;
}
}
private int plus(boolean spaceSeen) throws IOException {
int c = nextc();
if (isAfterOperator()) {
setState(EXPR_ARG);
if (c == '@') {
yaccValue = "+@";
return Tokens.tUPLUS;
}
pushback(c);
yaccValue = "+";
return Tokens.tPLUS;
}
if (c == '=') {
setState(EXPR_BEG);
yaccValue = "+";
return Tokens.tOP_ASGN;
}
if (isBEG() || (isSpaceArg(c, spaceSeen) && arg_ambiguous())) {
setState(EXPR_BEG);
pushback(c);
if (Character.isDigit(c)) {
c = '+';
return parseNumber(c);
}
yaccValue = "+";
return Tokens.tUPLUS;
}
setState(EXPR_BEG);
pushback(c);
yaccValue = "+";
warn_balanced(c, spaceSeen, "+", "unary operator");
return Tokens.tPLUS;
}
private int questionMark() throws IOException {
int c;
if (isEND()) {
setState(EXPR_VALUE);
yaccValue = "?";
return '?';
}
c = nextc();
if (c == EOF) compile_error(PID.INCOMPLETE_CHAR_SYNTAX, "incomplete character syntax");
if (Character.isWhitespace(c)){
if (!isARG()) {
int c2 = 0;
switch (c) {
case ' ':
c2 = 's';
break;
case '\n':
c2 = 'n';
break;
case '\t':
c2 = 't';
break;
/* What is \v in C?
case '\v':
c2 = 'v';
break;
*/
case '\r':
c2 = 'r';
break;
case '\f':
c2 = 'f';
break;
}
if (c2 != 0) {
warnings.warn(ID.INVALID_CHAR_SEQUENCE, getFile(), ruby_sourceline, "invalid character syntax; use ?\\" + c2);
}
}
pushback(c);
setState(EXPR_VALUE);
yaccValue = "?";
return '?';
}
if (!isASCII(c)) {
if (!tokadd_mbchar(c)) return EOF;
} else if (isIdentifierChar(c) && !peek('\n') && isNext_identchar()) {
newtok(true);
pushback(c);
setState(EXPR_VALUE);
yaccValue = "?";
return '?';
} else if (c == '\\') {
if (peek('u')) {
nextc(); // Eat 'u'
ByteList oneCharBL = new ByteList(2);
oneCharBL.setEncoding(getEncoding());
c = readUTFEscape(oneCharBL, false, false);
if (c >= 0x80) {
tokaddmbc(c, oneCharBL);
} else {
oneCharBL.append(c);
}
setState(EXPR_END);
yaccValue = new StrNode(getPosition(), oneCharBL);
return Tokens.tCHAR;
} else {
c = readEscape();
}
} else {
newtok(true);
}
ByteList oneCharBL = new ByteList(1);
oneCharBL.append(c);
yaccValue = new StrNode(getPosition(), oneCharBL);
setState(EXPR_END);
return Tokens.tCHAR;
}
private int rightBracket() {
parenNest--;
conditionState.restart();
cmdArgumentState.restart();
setState(EXPR_ENDARG);
yaccValue = "]";
return Tokens.tRBRACK;
}
private int rightCurly() {
conditionState.restart();
cmdArgumentState.restart();
setState(EXPR_ENDARG);
yaccValue = "}";
int tok = braceNest == 0 ? Tokens.tSTRING_DEND : Tokens.tRCURLY;
braceNest--;
return tok;
}
private int rightParen() {
parenNest--;
conditionState.restart();
cmdArgumentState.restart();
setState(EXPR_ENDFN);
yaccValue = ")";
return Tokens.tRPAREN;
}
private int singleQuote(boolean commandState) throws IOException {
int label = isLabelPossible(commandState) ? str_label : 0;
lex_strterm = new StringTerm(str_squote|label, '\0', '\'', ruby_sourceline);
yaccValue = "'";
return Tokens.tSTRING_BEG;
}
private int slash(boolean spaceSeen) throws IOException {
if (isBEG()) {
lex_strterm = new StringTerm(str_regexp, '\0', '/', ruby_sourceline);
yaccValue = "/";
return Tokens.tREGEXP_BEG;
}
int c = nextc();
if (c == '=') {
setState(EXPR_BEG);
yaccValue = "/";
return Tokens.tOP_ASGN;
}
pushback(c);
if (isSpaceArg(c, spaceSeen)) {
arg_ambiguous();
lex_strterm = new StringTerm(str_regexp, '\0', '/', ruby_sourceline);
yaccValue = "/";
return Tokens.tREGEXP_BEG;
}
setState(isAfterOperator() ? EXPR_ARG : EXPR_BEG);
yaccValue = "/";
warn_balanced(c, spaceSeen, "/", "regexp literal");
return Tokens.tDIVIDE;
}
private int star(boolean spaceSeen) throws IOException {
int c = nextc();
switch (c) {
case '*':
if ((c = nextc()) == '=') {
setState(EXPR_BEG);
yaccValue = "**";
return Tokens.tOP_ASGN;
}
pushback(c); // not a '=' put it back
yaccValue = "**";
if (isSpaceArg(c, spaceSeen)) {
if (warnings.isVerbose() && Options.PARSER_WARN_ARGUMENT_PREFIX.load())
warnings.warning(ID.ARGUMENT_AS_PREFIX, getFile(), ruby_sourceline, "`**' interpreted as argument prefix");
c = Tokens.tDSTAR;
} else if (isBEG()) {
c = Tokens.tDSTAR;
} else {
warn_balanced(c, spaceSeen, "**", "argument prefix");
c = Tokens.tPOW;
}
break;
case '=':
setState(EXPR_BEG);
yaccValue = "*";
return Tokens.tOP_ASGN;
default:
pushback(c);
if (isSpaceArg(c, spaceSeen)) {
if (warnings.isVerbose() && Options.PARSER_WARN_ARGUMENT_PREFIX.load())
warnings.warning(ID.ARGUMENT_AS_PREFIX, getFile(), ruby_sourceline, "`*' interpreted as argument prefix");
c = Tokens.tSTAR;
} else if (isBEG()) {
c = Tokens.tSTAR;
} else {
warn_balanced(c, spaceSeen, "*", "argument prefix");
c = Tokens.tSTAR2;
}
yaccValue = "*";
}
setState(isAfterOperator() ? EXPR_ARG : EXPR_BEG);
return c;
}
private int tilde() throws IOException {
int c;
if (isAfterOperator()) {
if ((c = nextc()) != '@') pushback(c);
setState(EXPR_ARG);
} else {
setState(EXPR_BEG);
}
yaccValue = "~";
return Tokens.tTILDE;
}
private ByteList numberBuffer = new ByteList(10); // ascii is good enough.
/**
* Parse a number from the input stream.
*
*@param c The first character of the number.
*@return An int constant which represents a token.
*/
private int parseNumber(int c) throws IOException {
setState(EXPR_END);
newtok(true);
numberBuffer.setRealSize(0);
if (c == '-') {
numberBuffer.append((char) c);
c = nextc();
} else if (c == '+') {
// We don't append '+' since Java number parser gets confused
c = nextc();
}
int nondigit = 0;
if (c == '0') {
int startLen = numberBuffer.length();
switch (c = nextc()) {
case 'x' :
case 'X' : // hexadecimal
c = nextc();
if (isHexChar(c)) {
for (;; c = nextc()) {
if (c == '_') {
if (nondigit != '\0') break;
nondigit = c;
} else if (isHexChar(c)) {
nondigit = '\0';
numberBuffer.append((char) c);
} else {
break;
}
}
}
pushback(c);
if (numberBuffer.length() == startLen) {
compile_error(PID.BAD_HEX_NUMBER, "Hexadecimal number without hex-digits.");
} else if (nondigit != '\0') {
compile_error(PID.TRAILING_UNDERSCORE_IN_NUMBER, "Trailing '_' in number.");
}
return getIntegerToken(numberBuffer.toString(), 16, numberLiteralSuffix(SUFFIX_ALL));
case 'b' :
case 'B' : // binary
c = nextc();
if (c == '0' || c == '1') {
for (;; c = nextc()) {
if (c == '_') {
if (nondigit != '\0') break;
nondigit = c;
} else if (c == '0' || c == '1') {
nondigit = '\0';
numberBuffer.append((char) c);
} else {
break;
}
}
}
pushback(c);
if (numberBuffer.length() == startLen) {
compile_error(PID.EMPTY_BINARY_NUMBER, "Binary number without digits.");
} else if (nondigit != '\0') {
compile_error(PID.TRAILING_UNDERSCORE_IN_NUMBER, "Trailing '_' in number.");
}
return getIntegerToken(numberBuffer.toString(), 2, numberLiteralSuffix(SUFFIX_ALL));
case 'd' :
case 'D' : // decimal
c = nextc();
if (Character.isDigit(c)) {
for (;; c = nextc()) {
if (c == '_') {
if (nondigit != '\0') break;
nondigit = c;
} else if (Character.isDigit(c)) {
nondigit = '\0';
numberBuffer.append((char) c);
} else {
break;
}
}
}
pushback(c);
if (numberBuffer.length() == startLen) {
compile_error(PID.EMPTY_BINARY_NUMBER, "Binary number without digits.");
} else if (nondigit != '\0') {
compile_error(PID.TRAILING_UNDERSCORE_IN_NUMBER, "Trailing '_' in number.");
}
return getIntegerToken(numberBuffer.toString(), 10, numberLiteralSuffix(SUFFIX_ALL));
case 'o':
case 'O':
c = nextc();
case '0': case '1': case '2': case '3': case '4': //Octal
case '5': case '6': case '7': case '_':
for (;; c = nextc()) {
if (c == '_') {
if (nondigit != '\0') break;
nondigit = c;
} else if (c >= '0' && c <= '7') {
nondigit = '\0';
numberBuffer.append((char) c);
} else {
break;
}
}
if (numberBuffer.length() > startLen) {
pushback(c);
if (nondigit != '\0') compile_error(PID.TRAILING_UNDERSCORE_IN_NUMBER, "Trailing '_' in number.");
return getIntegerToken(numberBuffer.toString(), 8, numberLiteralSuffix(SUFFIX_ALL));
}
case '8' :
case '9' :
compile_error(PID.BAD_OCTAL_DIGIT, "Illegal octal digit.");
case '.' :
case 'e' :
case 'E' :
numberBuffer.append('0');
break;
default :
pushback(c);
numberBuffer.append('0');
return getIntegerToken(numberBuffer.toString(), 10, numberLiteralSuffix(SUFFIX_ALL));
}
}
boolean seen_point = false;
boolean seen_e = false;
for (;; c = nextc()) {
switch (c) {
case '0' :
case '1' :
case '2' :
case '3' :
case '4' :
case '5' :
case '6' :
case '7' :
case '8' :
case '9' :
nondigit = '\0';
numberBuffer.append((char) c);
break;
case '.' :
if (nondigit != '\0') {
pushback(c);
compile_error(PID.TRAILING_UNDERSCORE_IN_NUMBER, "Trailing '_' in number.");
} else if (seen_point || seen_e) {
pushback(c);
return getNumberToken(numberBuffer.toString(), seen_e, seen_point, nondigit);
} else {
int c2;
if (!Character.isDigit(c2 = nextc())) {
pushback(c2);
pushback('.');
if (c == '_') {
// Enebo: c can never be antrhign but '.'
// Why did I put this here?
} else {
return getIntegerToken(numberBuffer.toString(), 10, numberLiteralSuffix(SUFFIX_ALL));
}
} else {
numberBuffer.append('.');
numberBuffer.append((char) c2);
seen_point = true;
nondigit = '\0';
}
}
break;
case 'e' :
case 'E' :
if (nondigit != 0) {
pushback(c);
return getNumberToken(numberBuffer.toString(), seen_e, seen_point, nondigit);
} else if (seen_e) {
pushback(c);
return getNumberToken(numberBuffer.toString(), seen_e, seen_point, nondigit);
} else {
numberBuffer.append((char) c);
seen_e = true;
nondigit = c;
c = nextc();
if (c == '-' || c == '+') {
numberBuffer.append((char) c);
nondigit = c;
} else {
pushback(c);
}
}
break;
case '_' : // '_' in number just ignored
if (nondigit != '\0') compile_error(PID.TRAILING_UNDERSCORE_IN_NUMBER, "Trailing '_' in number.");
nondigit = c;
break;
default :
pushback(c);
return getNumberToken(numberBuffer.toString(), seen_e, seen_point, nondigit);
}
}
}
private int getNumberToken(String number, boolean seen_e, boolean seen_point, int nondigit) throws IOException {
boolean isFloat = seen_e || seen_point;
if (nondigit != '\0') {
compile_error(PID.TRAILING_UNDERSCORE_IN_NUMBER, "Trailing '_' in number.");
} else if (isFloat) {
int suffix = numberLiteralSuffix(seen_e ? SUFFIX_I : SUFFIX_ALL);
return getFloatToken(number, suffix);
}
return getIntegerToken(number, 10, numberLiteralSuffix(SUFFIX_ALL));
}
// Note: parser_tokadd_utf8 variant just for regexp literal parsing. This variant is to be
// called when string_literal and regexp_literal.
public void readUTFEscapeRegexpLiteral(ByteList buffer) throws IOException {
buffer.append('\\');
buffer.append('u');
if (peek('{')) { // handle \\u{...}
do {
buffer.append(nextc());
if (scanHexLiteral(buffer, 6, false, "invalid Unicode escape") > 0x10ffff) {
compile_error(PID.INVALID_ESCAPE_SYNTAX, "invalid Unicode codepoint (too large)");
}
} while (peek(' ') || peek('\t'));
int c = nextc();
if (c != '}') compile_error(PID.INVALID_ESCAPE_SYNTAX, "unterminated Unicode escape");
buffer.append((char) c);
} else { // handle \\uxxxx
scanHexLiteral(buffer, 4, true, "Invalid Unicode escape");
}
}
// MRI: parser_tokadd_utf8 sans regexp literal parsing
public int readUTFEscape(ByteList buffer, boolean stringLiteral, boolean symbolLiteral) throws IOException {
int codepoint;
int c;
if (peek('{')) { // handle \\u{...}
do {
nextc(); // Eat curly or whitespace
codepoint = scanHex(6, false, "invalid Unicode escape");
if (codepoint > 0x10ffff) {
compile_error(PID.INVALID_ESCAPE_SYNTAX, "invalid Unicode codepoint (too large)");
}
if (buffer != null) readUTF8EscapeIntoBuffer(codepoint, buffer, stringLiteral);
} while (peek(' ') || peek('\t'));
c = nextc();
if (c != '}') {
compile_error(PID.INVALID_ESCAPE_SYNTAX, "unterminated Unicode escape");
}
} else { // handle \\uxxxx
codepoint = scanHex(4, true, "Invalid Unicode escape");
if (buffer != null) readUTF8EscapeIntoBuffer(codepoint, buffer, stringLiteral);
}
return codepoint;
}
private void readUTF8EscapeIntoBuffer(int codepoint, ByteList buffer, boolean stringLiteral) throws IOException {
if (codepoint >= 0x80) {
buffer.setEncoding(UTF8_ENCODING);
if (stringLiteral) tokaddmbc(codepoint, buffer);
} else if (stringLiteral) {
buffer.append((char) codepoint);
}
}
public int readEscape() throws IOException {
int c = nextc();
switch (c) {
case '\\' : // backslash
return c;
case 'n' : // newline
return '\n';
case 't' : // horizontal tab
return '\t';
case 'r' : // carriage return
return '\r';
case 'f' : // form feed
return '\f';
case 'v' : // vertical tab
return '\u000B';
case 'a' : // alarm(bell)
return '\u0007';
case 'e' : // escape
return '\u001B';
case '0' : case '1' : case '2' : case '3' : // octal constant
case '4' : case '5' : case '6' : case '7' :
pushback(c);
return scanOct(3);
case 'x' : // hex constant
return scanHex(2, false, "Invalid escape character syntax");
case 'b' : // backspace
return '\010';
case 's' : // space
return ' ';
case 'M' :
if ((c = nextc()) != '-') {
compile_error(PID.INVALID_ESCAPE_SYNTAX, "Invalid escape character syntax");
} else if ((c = nextc()) == '\\') {
return (char) (readEscape() | 0x80);
} else if (c == EOF) {
compile_error(PID.INVALID_ESCAPE_SYNTAX, "Invalid escape character syntax");
}
return (char) ((c & 0xff) | 0x80);
case 'C' :
if (nextc() != '-') {
compile_error(PID.INVALID_ESCAPE_SYNTAX, "Invalid escape character syntax");
}
case 'c' :
if ((c = nextc()) == '\\') {
c = readEscape();
} else if (c == '?') {
return '\177';
} else if (c == EOF) {
compile_error(PID.INVALID_ESCAPE_SYNTAX, "Invalid escape character syntax");
}
return (char) (c & 0x9f);
case EOF :
compile_error(PID.INVALID_ESCAPE_SYNTAX, "Invalid escape character syntax");
default :
return c;
}
}
/**
* Read up to count hexadecimal digits and store those digits in a token numberBuffer. If strict is
* provided then count number of hex digits must be present. If no digits can be read a syntax
* exception will be thrown. This will also return the codepoint as a value so codepoint
* ranges can be checked.
*/
private char scanHexLiteral(ByteList buffer, int count, boolean strict, String errorMessage)
throws IOException {
int i = 0;
char hexValue = '\0';
for (; i < count; i++) {
int h1 = nextc();
if (!isHexChar(h1)) {
pushback(h1);
break;
}
buffer.append(h1);
hexValue <<= 4;
hexValue |= Integer.parseInt(String.valueOf((char) h1), 16) & 15;
}
// No hex value after the 'x'.
if (i == 0 || strict && count != i) {
compile_error(PID.INVALID_ESCAPE_SYNTAX, errorMessage);
}
return hexValue;
}
/**
* Read up to count hexadecimal digits. If strict is provided then count number of hex
* digits must be present. If no digits can be read a syntax exception will be thrown.
*/
private int scanHex(int count, boolean strict, String errorMessage) throws IOException {
int i = 0;
int hexValue = '\0';
for (; i < count; i++) {
int h1 = nextc();
if (!isHexChar(h1)) {
pushback(h1);
break;
}
hexValue <<= 4;
hexValue |= Integer.parseInt("" + (char) h1, 16) & 15;
}
// No hex value after the 'x'.
if (i == 0 || (strict && count != i)) compile_error(PID.INVALID_ESCAPE_SYNTAX, errorMessage);
return hexValue;
}
}
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