/***** BEGIN LICENSE BLOCK *****
* Version: CPL 1.0/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Common 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/cpl-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) 2004 Jan Arne Petersen <jpetersen@uni-bonn.de>
*
* 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
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package org.jruby.lexer.yacc;
import org.jruby.ast.RegexpNode;
import org.jruby.ast.StrNode;
import org.jruby.lexer.yacc.SyntaxException.PID;
import org.jruby.parser.ReOptions;
import org.jruby.parser.Tokens;
import org.jruby.util.ByteList;
public class StringTerm extends StrTerm {
// Expand variables, Indentation of final marker
private int flags;
// Start of string ([, (, {, <, ', ", \n)
private final char begin;
// End of string (], ), }, >, ', ", \0)
private final char end;
// How many strings are nested in the current string term
private int nest;
public StringTerm(int flags, int begin, int end) {
this.flags = flags;
this.begin = (char) begin;
this.end = (char) end;
this.nest = 0;
}
public int parseString(RubyYaccLexer lexer, LexerSource src) throws java.io.IOException {
boolean spaceSeen = false;
int c;
// FIXME: How much more obtuse can this be?
// Heredoc already parsed this and saved string...Do not parse..just return
if (flags == -1) {
lexer.setValue(new Token("\"", lexer.getPosition()));
return Tokens.tSTRING_END;
}
c = src.read();
if ((flags & RubyYaccLexer.STR_FUNC_QWORDS) != 0 && Character.isWhitespace(c)) {
do {
c = src.read();
} while (Character.isWhitespace(c));
spaceSeen = true;
}
if (c == end && nest == 0) {
if ((flags & RubyYaccLexer.STR_FUNC_QWORDS) != 0) {
flags = -1;
lexer.getPosition();
return ' ';
}
if ((flags & RubyYaccLexer.STR_FUNC_REGEXP) != 0) {
lexer.setValue(new RegexpNode(src.getPosition(), ByteList.create(""), parseRegexpFlags(src)));
return Tokens.tREGEXP_END;
}
lexer.setValue(new Token("\"", lexer.getPosition()));
return Tokens.tSTRING_END;
}
if (spaceSeen) {
src.unread(c);
lexer.getPosition();
return ' ';
}
// Single-quote fast path
if (begin == '\0' && flags == 0) {
ByteList buffer = new ByteList();
src.unread(c);
if (parseSimpleStringIntoBuffer(src, buffer) == RubyYaccLexer.EOF) {
throw new SyntaxException(PID.STRING_HITS_EOF, src.getPosition(), "unterminated string meets end of file");
}
/*
ByteList buffer;
src.unread(c);
if ((buffer = src.readUntil(end)) == null) {
throw new SyntaxException(src.getPosition(), "unterminated string meets end of file");
}
*/
lexer.setValue(new StrNode(lexer.getPosition(), buffer));
return Tokens.tSTRING_CONTENT;
}
ByteList buffer = new ByteList();
if ((flags & RubyYaccLexer.STR_FUNC_EXPAND) != 0 && c == '#') {
c = src.read();
switch (c) {
case '$':
case '@':
src.unread(c);
lexer.setValue(new Token("#" + c, lexer.getPosition()));
return Tokens.tSTRING_DVAR;
case '{':
lexer.setValue(new Token("#" + c, lexer.getPosition()));
return Tokens.tSTRING_DBEG;
}
buffer.append((byte) '#');
}
src.unread(c);
if (parseStringIntoBuffer(lexer, src, buffer) == RubyYaccLexer.EOF) {
throw new SyntaxException(PID.STRING_HITS_EOF, src.getPosition(), "unterminated string meets end of file");
}
lexer.setValue(new StrNode(lexer.getPosition(), buffer));
return Tokens.tSTRING_CONTENT;
}
private int parseRegexpFlags(final LexerSource src) throws java.io.IOException {
char kcode = 0;
int options = 0;
int c;
StringBuilder unknownFlags = new StringBuilder(10);
for (c = src.read(); c != RubyYaccLexer.EOF
&& Character.isLetter(c); c = src.read()) {
switch (c) {
case 'i':
options |= ReOptions.RE_OPTION_IGNORECASE;
break;
case 'x':
options |= ReOptions.RE_OPTION_EXTENDED;
break;
case 'm':
options |= ReOptions.RE_OPTION_MULTILINE;
break;
case 'o':
options |= ReOptions.RE_OPTION_ONCE;
break;
case 'n':
kcode = 16;
break;
case 'e':
kcode = 32;
break;
case 's':
kcode = 48;
break;
case 'u':
kcode = 64;
break;
case 'j':
options |= 256; // Regexp engine 'java'
break;
default:
unknownFlags.append((char) c);
break;
}
}
src.unread(c);
if (unknownFlags.length() != 0) {
throw new SyntaxException(PID.REGEXP_UNKNOWN_OPTION, src.getPosition(), "unknown regexp option"
+ (unknownFlags.length() > 1 ? "s" : "") + " - "
+ unknownFlags.toString(), unknownFlags.toString());
}
return options | kcode;
}
public int parseSimpleStringIntoBuffer(LexerSource src, ByteList buffer) throws java.io.IOException {
int c;
while ((c = src.read()) != RubyYaccLexer.EOF) {
if (c == end) {
src.unread(c);
break;
} else if (c == '\\') {
c = src.read();
if ((c == '\n' || c != end) && c != '\\') buffer.append('\\');
}
buffer.append(c);
}
return c;
}
public int parseStringIntoBuffer(RubyYaccLexer lexer, LexerSource src, ByteList buffer) throws java.io.IOException {
boolean qwords = (flags & RubyYaccLexer.STR_FUNC_QWORDS) != 0;
boolean expand = (flags & RubyYaccLexer.STR_FUNC_EXPAND) != 0;
boolean escape = (flags & RubyYaccLexer.STR_FUNC_ESCAPE) != 0;
boolean regexp = (flags & RubyYaccLexer.STR_FUNC_REGEXP) != 0;
int c;
while ((c = src.read()) != RubyYaccLexer.EOF) {
if (begin != '\0' && c == begin) {
nest++;
} else if (c == end) {
if (nest == 0) {
src.unread(c);
break;
}
nest--;
} else if (c == '#' && expand && !src.peek('\n')) {
int c2 = src.read();
if (c2 == '$' || c2 == '@' || c2 == '{') {
src.unread(c2);
src.unread(c);
break;
}
src.unread(c2);
} else if (c == '\\') {
c = src.read();
switch (c) {
case '\n':
if (qwords) break;
if (expand) continue;
buffer.append('\\');
break;
case '\\':
if (escape) buffer.append(c);
break;
default:
if (regexp) {
src.unread(c);
parseEscapeIntoBuffer(src, buffer);
continue;
} else if (expand) {
src.unread(c);
if (escape) buffer.append('\\');
c = lexer.readEscape();
} else if (qwords && Character.isWhitespace(c)) {
/* ignore backslashed spaces in %w */
} else if (c != end && !(begin != '\0' && c == begin)) {
buffer.append('\\');
}
}
} else if (qwords && Character.isWhitespace(c)) {
src.unread(c);
break;
}
buffer.append(c);
}
return c;
}
// Was a goto in original ruby lexer
private void escaped(LexerSource src, ByteList buffer) throws java.io.IOException {
int c;
switch (c = src.read()) {
case '\\':
parseEscapeIntoBuffer(src, buffer);
break;
case RubyYaccLexer.EOF:
throw new SyntaxException(PID.INVALID_ESCAPE_SYNTAX, src.getPosition(), "Invalid escape character syntax");
default:
buffer.append(c);
}
}
private void parseEscapeIntoBuffer(LexerSource src, ByteList buffer) throws java.io.IOException {
int c;
switch (c = src.read()) {
case '\n':
break; /* just ignore */
case '0':
case '1':
case '2':
case '3': /* octal constant */
case '4':
case '5':
case '6':
case '7':
buffer.append('\\');
buffer.append(c);
for (int i = 0; i < 2; i++) {
c = src.read();
if (c == RubyYaccLexer.EOF) {
throw new SyntaxException(PID.INVALID_ESCAPE_SYNTAX, src.getPosition(), "Invalid escape character syntax");
}
if (!RubyYaccLexer.isOctChar(c)) {
src.unread(c);
break;
}
buffer.append(c);
}
break;
case 'x': /* hex constant */
buffer.append('\\');
buffer.append(c);
c = src.read();
if (!RubyYaccLexer.isHexChar(c)) {
throw new SyntaxException(PID.INVALID_ESCAPE_SYNTAX, src.getPosition(), "Invalid escape character syntax");
}
buffer.append(c);
c = src.read();
if (RubyYaccLexer.isHexChar(c)) {
buffer.append(c);
} else {
src.unread(c);
}
break;
case 'M':
if ((c = src.read()) != '-') {
throw new SyntaxException(PID.INVALID_ESCAPE_SYNTAX, src.getPosition(), "Invalid escape character syntax");
}
buffer.append(new byte[] { '\\', 'M', '-' });
escaped(src, buffer);
break;
case 'C':
if ((c = src.read()) != '-') {
throw new SyntaxException(PID.INVALID_ESCAPE_SYNTAX, src.getPosition(), "Invalid escape character syntax");
}
buffer.append(new byte[] { '\\', 'C', '-' });
escaped(src, buffer);
break;
case 'c':
buffer.append(new byte[] { '\\', 'c' });
escaped(src, buffer);
break;
case RubyYaccLexer.EOF:
throw new SyntaxException(PID.INVALID_ESCAPE_SYNTAX, src.getPosition(), "Invalid escape character syntax");
default:
if (c != '\\' || c != end) {
buffer.append('\\');
}
buffer.append(c);
}
}
}