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[css2] Added two section titles and a few index terms.
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‎css2/grammar.src‎

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html lang="en">
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<!-- $Id: grammar.src,v 1.23 1998-01-27 23:00:56 bbos Exp $ -->
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<!-- $Id: grammar.src,v 1.24 1998-01-28 10:01:55 bbos Exp $ -->
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<HEAD>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<TITLE>Appendix D: The grammar of CSS2</TITLE>
@@ -24,11 +24,15 @@ imposes restrictions on the possible values of the "class" attribute.
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<!-- IJ: There used to be a link to "unit notation", but I couldn't
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find anything in the spec that corresponded. -->
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<P> The grammar below is LL(1) (but note that most UA's should not use
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it directly, since it doesn't express the parsing conventions, only
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the CSS2 syntax). The format of the productions is optimized for
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human consumption and some shorthand notation beyond
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<a rel="biblioentry" href="./refs.html#ref-YACC" class="normref">[YACC]</a> is used:</P>
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<h2>Grammar</h2>
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<P> The grammar below is <span class="index-inst"
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title="LL(1)">LL(1)</span> (but note that most UA's should not use it
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directly, since it doesn't express the <a
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href="syndata.html#parsing-errors">parsing conventions</a>, only the
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CSS2 syntax). The format of the productions is optimized for human
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consumption and some shorthand notation beyond <a rel="biblioentry"
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href="./refs.html#ref-YACC" class="normref">[YACC]</a> is used:</P>
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<ul>
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<li><strong>*</strong>: 0 or more
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;
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import
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: IMPORT_SYM S*
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[STRING|URL] S* [ medium [ ',' S* medium]* ]? ';' S*
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[STRING|URI] S* [ medium [ ',' S* medium]* ]? ';' S*
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;
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media
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: MEDIA_SYM S* medium [ ',' S* medium ]* '{' S* ruleset* '}' S*
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: selector [ ',' S* selector ]*
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'{' S* declaration [ ';' S* declaration ]* '}' S*
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;
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selector
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<span class="index-inst" title="selector">selector</span>
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: simple_selector [ combinator simple_selector ]*
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;
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/*
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* simple selector cannot start with attrib selector
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*/
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simple_selector
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: element_name [ HASH | CLASS | attrib | pseudo ]* S*
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| HASH [ CLASS | attrib | pseudo ]* S*
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| pseudo [ HASH | CLASS | attrib | pseudo ]* S*
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| CLASS [ HASH | CLASS | attrib | pseudo ]* S*
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: element_name [ HASH | class | attrib | pseudo ]* S*
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| HASH [ class | attrib | pseudo ]* S*
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| pseudo [ HASH | class | attrib | pseudo ]* S*
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| class [ HASH | class | attrib | pseudo ]* S*
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;
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class
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: '.' IDENT
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;
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element_name
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: IDENT | '*'
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: unary_operator?
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[ NUMBER S* | PERCENTAGE S* | LENGTH S* | EMS S* | EXS S* | ANGLE S* |
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TIME S* | FREQ S* | function ]
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| STRING S* | IDENT S* | URL S* | RGB S* | UNICODERANGE S* | hexcolor
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| STRING S* | IDENT S* | URI S* | RGB S* | UNICODERANGE S* | hexcolor
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;
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function
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: FUNCTION S* expr ')' S*
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;
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/*
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* There is a constraint on the color that it must
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* There is a constraint on the <span class="index-inst" title="color">color</span> that it must
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* have either 3 or 6 hex-digits (i.e., [0-9a-fA-F])
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* after the "#"; e.g., "#000" is OK, but "#abcd" is not.
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*/
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;
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</pre>
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<p> The following is the tokenizer, written in flex <a
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rel="biblioentry" href="./refs.html#ref-FLEX" class="normref">[FLEX]</a>
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notation. The
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tokenizer is case-insensitive (flex command line
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option -i).
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<h2>Lexical scanner</h2>
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<p> The following is the <span class="index-def"
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title="tokenizer">tokenizer</span>, written in flex <a
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rel="biblioentry" href="./refs.html#ref-FLEX"
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class="normref">[FLEX]</a> notation. The tokenizer is case-insensitive
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(flex command line option -i).
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<p>The two occurrences of "\377" represent the highest character
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number that current versions of Flex can deal with (decimal 255). They
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{ident} {return IDENT;}
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"."{ident} {return CLASS;}
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"#"{name} {return HASH;}
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"@import" {return IMPORT_SYM;}
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{num}% {return PERCENTAGE;}
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{num} {return NUMBER;}
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"url("{w}{string}{w}")" {return URL;}
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"url("{w}{url}{w}")" {return URL;}
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"url("{w}{string}{w}")" {return URI;}
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"url("{w}{url}{w}")" {return URI;}
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{ident}"(" {return FUNCTION;}
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U\+{range} {return UNICODERANGE;}

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