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NAME [a-zA-Z_][a-zA-Z0-9_-]*
BR \r\n|\n|\r
%s indented trail rules
%x code start_condition options conditions action
%%
<action>"/*"(.|\n|\r)*?"*/" return 'ACTION_BODY';
<action>"//".* return 'ACTION_BODY';
<action>"/"[^ /]*?['"{}'][^ ]*?"/" return 'ACTION_BODY'; // regexp with braces or quotes (and no spaces)
<action>\"("\\\\"|'\"'|[^"])*\" return 'ACTION_BODY';
<action>"'"("\\\\"|"\'"|[^'])*"'" return 'ACTION_BODY';
<action>[/"'][^{}/"']+ return 'ACTION_BODY';
<action>[^{}/"']+ return 'ACTION_BODY';
<action>"{" yy.depth++; return '{'
<action>"}" yy.depth == 0 ? this.begin('trail') : yy.depth--; return '}'
<conditions>{NAME} return 'NAME';
<conditions>">" this.popState(); return '>';
<conditions>"," return ',';
<conditions>"*" return '*';
<rules>{BR}+ /* */
<rules>\s+{BR}+ /* */
<rules>\s+ this.begin('indented')
<rules>"%%" this.begin('code'); return '%%'
<rules>[a-zA-Z0-9_]+ return 'CHARACTER_LIT'
<options>{NAME} yy.options[yytext] = true
<options>{BR}+ this.begin('INITIAL')
<options>\s+{BR}+ this.begin('INITIAL')
<options>\s+ /* empty */
<start_condition>{NAME} return 'START_COND'
<start_condition>{BR}+ this.begin('INITIAL')
<start_condition>\s+{BR}+ this.begin('INITIAL')
<start_condition>\s+ /* empty */
<trail>.*{BR}+ this.begin('rules')
<indented>"{" yy.depth = 0; this.begin('action'); return '{'
<indented>"%{"(.|{BR})*?"%}" this.begin('trail'); yytext = yytext.substr(2, yytext.length-4);return 'ACTION'
"%{"(.|{BR})*?"%}" yytext = yytext.substr(2, yytext.length-4); return 'ACTION'
<indented>.+ this.begin('rules'); return 'ACTION'
"/*"(.|\n|\r)*?"*/" /* ignore */
"//".* /* ignore */
{BR}+ /* */
\s+ /* */
{NAME} return 'NAME';
\"("\\\\"|'\"'|[^"])*\" yytext = yytext.replace(/\\"/g,'"'); return 'STRING_LIT';
"'"("\\\\"|"\'"|[^'])*"'" yytext = yytext.replace(/\\'/g,"'"); return 'STRING_LIT';
"|" return '|';
"["("\\\\"|"\]"|[^\]])*"]" return 'ANY_GROUP_REGEX';
"(?:" return 'SPECIAL_GROUP';
"(?=" return 'SPECIAL_GROUP';
"(?!" return 'SPECIAL_GROUP';
"(" return '(';
")" return ')';
"+" return '+';
"*" return '*';
"?" return '?';
"^" return '^';
"," return ',';
"<<EOF>>" return '$';
"<" this.begin('conditions'); return '<';
"/!" return '/!';
"/" return '/';
"\\"([0-7]{1,3}|[rfntvsSbBwWdD\\*+()${}|[\]\/.^?]|"c"[A-Z]|"x"[0-9A-F]{2}|"u"[a-fA-F0-9]{4}) return 'ESCAPE_CHAR';
"\\". yytext = yytext.replace(/^\\/g,''); return 'ESCAPE_CHAR';
"$" return '$';
"." return '.';
"%options" yy.options = {}; this.begin('options');
"%s" this.begin('start_condition'); return 'START_INC';
"%x" this.begin('start_condition'); return 'START_EXC';
"%%" this.begin('rules'); return '%%';
"{"\d+(","\s?\d+|",")?"}" return 'RANGE_REGEX';
"{"{NAME}"}" return 'NAME_BRACE';
"{" return '{';
"}" return '}';
. /* ignore bad characters */
<*><<EOF>> return 'EOF';
<code>(.|{BR})+ return 'CODE';
%%
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