looker/jison-lex

Name: jison-lex

Owner: looker

Description: generates lexical analyzers. used by jison.

Forked from: zaach/jison-lex

Created: 2017-06-16 21:04:13.0

Updated: 2017-06-16 21:04:14.0

Pushed: 2017-06-16 21:16:21.0

Homepage: null

Size: 41

Language: JavaScript

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README

jison-lex

A lexical analyzer generator used by jison. It takes a lexical grammar definition (either in JSON or Bison's lexical grammar format) and outputs a JavaScript lexer.

install

npm install jison-lex -g

usage

e: jison-lex [file] [options]

     file containing a lexical grammar

ons:
o FILE, --outfile FILE       Filename and base module name of the generated parser
t TYPE, --module-type TYPE   The type of module to generate (commonjs, js)
-version                     print version and exit

programatic usage

JisonLex = require('jison-lex');

grammar = {
les: [
["x", "return 'X';" ],
["y", "return 'Y';" ],
["$", "return 'EOF';" ]



r load from a file
ar grammar = fs.readFileSync('mylexer.l', 'utf8');

enerate source
lexerSource = JisonLex.generate(grammar);

r create a parser in memory
lexer = new JisonLex(grammar);
r.setInput('xyxxy');
r.lex();
> 'X'
r.lex();
> 'Y'

icense