blob: 96fe58a0156fbd311e26362a7b4dd4142123f60f [file] [log] [blame]
/*******************************************************************************
* Copyright (c) 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
/*nlsXXX*/
package org.eclipse.wst.common.encoding.contentspecific.css;
import java.io.IOException;
import java.io.Reader;
import org.eclipse.wst.common.encoding.contentspecific.EncodingParserConstants;
import org.eclipse.wst.common.encoding.contentspecific.HeadParserToken;
import org.eclipse.wst.common.encoding.contentspecific.IntStack;
import org.eclipse.wst.common.encoding.contentspecific.xml.XMLHeadTokenizerConstants;
%%
%{
private boolean hasMore = true;
private final static int MAX_TO_SCAN = 8000;
StringBuffer string = new StringBuffer();
// state stack for easier state handling
private IntStack fStateStack = new IntStack();
private String valueText = null;
public CSSHeadTokenizer() {
super();
}
public void reset (Reader in) {
/* the input device */
yy_reader = in;
/* the current state of the DFA */
yy_state = 0;
/* the current lexical state */
yy_lexical_state = YYINITIAL;
/* this buffer contains the current text to be matched and is
the source of the yytext() string */
java.util.Arrays.fill(yy_buffer, (char)0);
/* the textposition at the last accepting state */
yy_markedPos = 0;
/* the textposition at the last state to be included in yytext */
yy_pushbackPos = 0;
/* the current text position in the buffer */
yy_currentPos = 0;
/* startRead marks the beginning of the yytext() string in the buffer */
yy_startRead = 0;
/**
* endRead marks the last character in the buffer, that has been read
* from input
*/
yy_endRead = 0;
/* number of newlines encountered up to the start of the matched text */
yyline = 0;
/* the number of characters up to the start of the matched text */
yychar = 0;
/**
* the number of characters from the last newline up to the start
* of the matched text
*/
yycolumn = 0;
/**
* yy_atBOL == true <=> the scanner is currently at the beginning
* of a line
*/
yy_atBOL = false;
/* yy_atEOF == true <=> the scanner has returned a value for EOF */
yy_atEOF = false;
/* denotes if the user-EOF-code has already been executed */
yy_eof_done = false;
fStateStack.clear();
hasMore = true;
// its a little wasteful to "throw away" first char array generated
// by class init (via auto generated code), but we really do want
// a small buffer for our head parsers.
if (yy_buffer.length != MAX_TO_SCAN) {
yy_buffer = new char[MAX_TO_SCAN];
}
}
public final HeadParserToken getNextToken() throws IOException {
String context = null;
context = primGetNextToken();
HeadParserToken result = null;
if (valueText != null) {
result = createToken(context, yychar, valueText);
valueText = null;
} else {
result = createToken(context, yychar, yytext());
}
return result;
}
public final boolean hasMoreTokens() {
return hasMore && yychar < MAX_TO_SCAN;
}
private void pushCurrentState() {
fStateStack.push(yystate());
}
private void popState() {
yybegin(fStateStack.pop());
}
private HeadParserToken createToken(String context, int start, String text) {
return new HeadParserToken(context, start, text);
}
%}
%eof{
hasMore=false;
%eof}
%public
%class CSSHeadTokenizer
%function primGetNextToken
%type String
%char
%unicode
%ignorecase
%debug
%switch
UTF16BE = \xFE\xFF
UTF16LE = \xFF\xFE
UTF83ByteBOM = \xEF\xBB\xBF
//SpaceChar = [\x20\x09]
// [3] S ::= (0x20 | 0x9 | 0xD | 0xA)+
S = [\x20\x09\x0D\x0A]
BeginAttribeValue = {S}* \= {S}*
LineTerminator = \r|\n
%state ST_XMLDecl
%state CHARSET_RULE
%state QuotedAttributeValue
%state DQ_STRING
%state SQ_STRING
%state UnDelimitedString
%%
<YYINITIAL>
{
{UTF16BE} {hasMore = false; return EncodingParserConstants.UTF16BE;}
{UTF16LE} {hasMore = false; return EncodingParserConstants.UTF16LE;}
{UTF83ByteBOM} {hasMore = false; return EncodingParserConstants.UTF83ByteBOM;}
// force to be started on first line, but we do allow preceeding spaces
^ {S}* "<\?xml" {S}+ {if (yychar == 0 ) {yybegin(ST_XMLDecl); return XMLHeadTokenizerConstants.XMLDeclStart;}}
^ {S}* "@charset" {if (yychar == 0 ) {yybegin(CHARSET_RULE); return CSSHeadTokenizerConstants.CHARSET_RULE;}}
}
// I don't think there's really an XML form of CSS files ... but will leave here for consistency
<ST_XMLDecl>
{
//"version" {BeginAttribeValue} {pushCurrentState(); yybegin(QuotedAttributeValue); return XMLHeadTokenizerConstants.XMLDeclVersion;}
"encoding" {BeginAttribeValue} {pushCurrentState(); yybegin(QuotedAttributeValue); return XMLHeadTokenizerConstants.XMLDelEncoding;}
// note this "forced end" once end of XML Declaration found
"\?>" {yybegin(YYINITIAL); return XMLHeadTokenizerConstants.XMLDeclEnd;}
}
<CHARSET_RULE>
{
{S}* {pushCurrentState(); yybegin(QuotedAttributeValue);}
";" { yybegin(YYINITIAL); hasMore = false; return CSSHeadTokenizerConstants.RuleEnd;}
}
<QuotedAttributeValue>
{
\" { yybegin(DQ_STRING); string.setLength(0); }
\' { yybegin(SQ_STRING); string.setLength(0); }
// in this state, anything other than a space character can start an undelimited string
{S}*. { yypushback(1); yybegin(UnDelimitedString); string.setLength(0);}
}
<DQ_STRING>
{
\" { popState(); valueText = string.toString(); return EncodingParserConstants.StringValue; }
{LineTerminator} { yypushback(1);popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;}
"\?>" { yypushback(2); popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;}
"<" { yypushback(1);popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;}
">" { yypushback(1);popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;}
"\/>" { yypushback(2); popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;}
";" { yypushback(1); popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue; }
. { string.append( yytext() ); }
}
<SQ_STRING>
{
\' { popState(); valueText = string.toString(); return EncodingParserConstants.StringValue;}
{LineTerminator} { yypushback(1);popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;}
"%>" { yypushback(2);popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;}
"<" { yypushback(1);popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;}
">" { yypushback(1);popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;}
"\/>" { yypushback(2); popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;}
";" { yypushback(1); popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue; }
. { string.append( yytext() ); }
}
<UnDelimitedString>
{
{S} { yypushback(1);popState(); valueText = string.toString(); return EncodingParserConstants.UnDelimitedStringValue; }
{LineTerminator} { yypushback(1);popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;}
"\?>" { yypushback(2);popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;}
"<" { yypushback(1);popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;}
// these are a bit special, since we started an undelimit string, but found a quote ... probably indicates a missing beginning quote
\' { yypushback(1);popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTermintatedUnDelimitedStringValue;}
\" { yypushback(1);popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTermintatedUnDelimitedStringValue;}
">" { yypushback(1);popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;}
"\/>" { yypushback(2); popState(); valueText = string.toString(); return EncodingParserConstants.InvalidTerminatedStringValue;}
";" { yypushback(1); popState(); valueText = string.toString(); return EncodingParserConstants.UnDelimitedStringValue; }
. { string.append( yytext() ); }
}
// The "match anything" rule should always be in effect except for when looking for end of string
// (That is, remember to update state list if/when new states added)
<YYINITIAL, ST_XMLDecl, QuotedAttributeValue, CHARSET_RULE>
{
// this is the fallback (match "anything") rule (for this scanner, input is ignored, and position advanced, if not recognized)
.|\n {if (yychar > MAX_TO_SCAN) {hasMore=false; return EncodingParserConstants.MAX_CHARS_REACHED;}}
}
// this rule always in effect
<<EOF>> {hasMore = false; return EncodingParserConstants.EOF;}