# lex-parser A parser for lexical grammars used by [jison](http://jison.org) and jison-lex. ## install npm install lex-parser ## build To build the parser yourself, clone the git repo then run: make This will generate `lex-parser.js`. ## usage var lexParser = require("lex-parser"); // parse a lexical grammar and return JSON lexParser.parse("%% ... "); ## example The parser can parse its own lexical grammar, shown below: NAME [a-zA-Z_][a-zA-Z0-9_-]* %s indented trail rules %x code start_condition options conditions action %% [^{}]+ return 'ACTION_BODY' "{" yy.depth++; return '{' "}" yy.depth == 0 ? this.begin('trail') : yy.depth--; return '}' {NAME} return 'NAME' ">" this.popState(); return '>' "," return ',' "*" return '*' \n+ /* */ \s+ this.begin('indented') "%%" this.begin('code'); return '%%' [a-zA-Z0-9_]+ return 'CHARACTER_LIT' {NAME} yy.options[yytext] = true \n+ this.begin('INITIAL') \s+\n+ this.begin('INITIAL') \s+ /* empty */ {NAME} return 'START_COND' \n+ this.begin('INITIAL') \s+\n+ this.begin('INITIAL') \s+ /* empty */ .*\n+ this.begin('rules') "{" yy.depth = 0; this.begin('action'); return '{' "%{"(.|\n)*?"%}" this.begin('trail'); yytext = yytext.substr(2, yytext.length-4);return 'ACTION' "%{"(.|\n)*?"%}" yytext = yytext.substr(2, yytext.length-4); return 'ACTION' .+ this.begin('rules'); return 'ACTION' "/*"(.|\n|\r)*?"*/" /* ignore */ "//".* /* ignore */ \n+ /* */ \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 ',' "<>" 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 */ <*><> return 'EOF'

(.|\n)+                   return 'CODE'

    %%

## license

MIT