vis

a vi-like editor based on Plan 9's structural regular expressions
gherkin.lua

(1159B)
      1 -- Copyright 2015-2025 Jason Schindler. See LICENSE.
      2 -- Gherkin (https://github.com/cucumber/cucumber/wiki/Gherkin) LPeg lexer.
      3 
      4 local lexer = require('lexer')
      5 local token, word_match = lexer.token, lexer.word_match
      6 local P, S = lpeg.P, lpeg.S
      7 
      8 local lex = lexer.new('gherkin', {fold_by_indentation = true})
      9 
     10 -- Whitespace.
     11 lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
     12 
     13 -- Keywords.
     14 lex:add_rule('keyword', token(lexer.KEYWORD, word_match(
     15 	'And Background But Examples Feature Given Outline Scenario Scenarios Then When')))
     16 
     17 -- Strings.
     18 local doc_str = lexer.range('"""')
     19 local dq_str = lexer.range('"')
     20 lex:add_rule('string', token(lexer.STRING, doc_str + dq_str))
     21 
     22 -- Comments.
     23 lex:add_rule('comment', token(lexer.COMMENT, lexer.to_eol('#')))
     24 
     25 -- Numbers.
     26 -- lex:add_rule('number', token(lexer.NUMBER, lexer.number))
     27 
     28 -- Tags.
     29 lex:add_rule('tag', token(lexer.LABEL, '@' * lexer.word^0))
     30 
     31 -- Placeholders.
     32 lex:add_rule('placeholder', token(lexer.VARIABLE, lexer.range('<', '>', false, false, true)))
     33 
     34 -- Examples.
     35 lex:add_rule('example', token(lexer.DEFAULT, lexer.to_eol('|')))
     36 
     37 lexer.property['scintillua.comment'] = '#'
     38 
     39 return lex