The following is the tokenizer,

The following is the tokenizer, written in flex [16] notation. Note that this assumes an 8-bit implementation of flex. The tokenizer is case-insensitive (flex command line option -i).

unicode \\[0-9a-f]{1,4} latin1 [?-ÿ] escape {unicode}|\\[ -~?-ÿ] stringchar {escape}|{latin1}|[ !#$%&(-~] nmstrt [a-z]|{latin1}|{escape} nmchar [-a-z0-9]|{latin1}|{escape} ident {nmstrt}{nmchar}* name {nmchar}+ d [0-9] notnm [^-a-z0-9\\]|{latin1} w [ \t\n]* num {d}+|{d}*\.{d}+ string \"({stringchar}|\')*\"|\'({stringchar}|\")*\'

%x COMMENT %s AFTER_IDENT

%% "/*" {BEGIN(COMMENT);} <COMMENT>"*/" {BEGIN(0);} <COMMENT>\n {/* ignore */} <COMMENT>. {/* ignore */} @import {BEGIN(0); return IMPORT_SYM;} "!"{w}important {BEGIN(0); return IMPORTANT_SYM;} {ident} {BEGIN(AFTER_IDENT); return IDENT;} {string} {BEGIN(0); return STRING;}

{num} {BEGIN(0); return NUMBER;} {num}"%" {BEGIN(0); return PERCENTAGE;} {num}pt/{notnm} {BEGIN(0); return LENGTH;} {num}mm/{notnm} {BEGIN(0); return LENGTH;} {num}cm/{notnm} {BEGIN(0); return LENGTH;} {num}pc/{notnm} {BEGIN(0); return LENGTH;} {num}in/{notnm} {BEGIN(0); return LENGTH;} {num}px/{notnm} {BEGIN(0); return LENGTH;} {num}em/{notnm} {BEGIN(0); return EMS;} {num}ex/{notnm} {BEGIN(0); return EXS;}

<AFTER_IDENT>":"link {return LINK_PSCLASS_AFTER_IDENT;} <AFTER_IDENT>":"visited {return VISITED_PSCLASS_AFTER_IDENT;} <AFTER_IDENT>":"active {return ACTIVE_PSCLASS_AFTER_IDENT;} <AFTER_IDENT>":"first-line {return FIRST_LINE_AFTER_IDENT;} <AFTER_IDENT>":"first-letter {return FIRST_LETTER_AFTER_IDENT;} <AFTER_IDENT>"#"{name} {return HASH_AFTER_IDENT;} <AFTER_IDENT>"."{name} {return CLASS_AFTER_IDENT;}

":"link {BEGIN(AFTER_IDENT); return LINK_PSCLASS;} ":"visited {BEGIN(AFTER_IDENT); return VISITED_PSCLASS;} ":"active {BEGIN(AFTER_IDENT); return ACTIVE_PSCLASS;} ":"first-line {BEGIN(AFTER_IDENT); return FIRST_LINE;} ":"first-letter {BEGIN(AFTER_IDENT); return FIRST_LETTER;} "#"{name} {BEGIN(AFTER_IDENT); return HASH;} "."{name} {BEGIN(AFTER_IDENT); return CLASS;}

url\({w}{string}{w}\) | url\({w}([^ \n\'\")]|\\\ |\\\'|\\\"|\\\))+{w}\) {BEGIN(0); return URL;} rgb\({w}{num}%?{w}\,{w}{num}%?{w}\,{w}{num}%?{w}\) {BEGIN(0); return RGB;}

[-/+{};,#:] {BEGIN(0); return *yytext;} [ \t]+ {BEGIN(0); /* ignore whitespace */} \n {BEGIN(0); /* ignore whitespace */} \<\!\-\- {BEGIN(0); return CDO;} \-\-\> {BEGIN(0); return CDC;} . {fprintf(stderr, "%d: Illegal character (%d)\n", lineno, *yytext);}


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