vis

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

(1424B)
      1 -- Copyright 2015-2025 Alejandro Baez (https://keybase.io/baez). See LICENSE.
      2 -- TOML LPeg lexer.
      3 
      4 local lexer = lexer
      5 local P, S = lpeg.P, lpeg.S
      6 
      7 local lex = lexer.new(..., {fold_by_indentation = true})
      8 
      9 -- Keywords.
     10 lex:add_rule('keyword', lex:tag(lexer.KEYWORD, lexer.word_match('true false')))
     11 
     12 -- Identifiers.
     13 lex:add_rule('identifier', lex:tag(lexer.IDENTIFIER, lexer.word))
     14 
     15 -- Strings.
     16 local sq_str = lexer.range("'")
     17 local dq_str = lexer.range('"')
     18 lex:add_rule('string', lex:tag(lexer.STRING, sq_str + dq_str))
     19 
     20 -- Comments.
     21 lex:add_rule('comment', lex:tag(lexer.COMMENT, lexer.to_eol('#')))
     22 
     23 -- Operators.
     24 lex:add_rule('operator', lex:tag(lexer.OPERATOR, S('=+-,.{}[]()')))
     25 
     26 -- Datetime.
     27 local year = lexer.digit * lexer.digit * lexer.digit * lexer.digit
     28 local month = lexer.digit * lexer.digit^-1
     29 local day = lexer.digit * lexer.digit^-1
     30 local date = year * '-' * month * '-' * day
     31 local hours = lexer.digit * lexer.digit^-1
     32 local minutes = lexer.digit * lexer.digit
     33 local seconds = lexer.digit * lexer.digit
     34 local fraction = '.' * lexer.digit^0
     35 local time = hours * ':' * minutes * ':' * seconds * fraction^-1
     36 local zone = 'Z' + S(' \t')^0 * S('-+') * hours * (':' * minutes)^-1
     37 lex:add_rule('datetime', lex:tag(lexer.NUMBER .. '.timestamp', date * (S('tT \t') * time * zone^-1)))
     38 
     39 -- Numbers.
     40 lex:add_rule('number', lex:tag(lexer.NUMBER, lexer.number))
     41 
     42 lexer.property['scintillua.comment'] = '#'
     43 
     44 return lex