lua/lexers/toml.lua

   1 -- Copyright 2015-2017 Alejandro Baez (https://keybase.io/baez). See LICENSE.
   2 -- TOML LPeg lexer.
   3
   4 local l = require("lexer")
   5 local token, word_match = l.token, l.word_match
   6 local P, R, S = lpeg.P, lpeg.R, lpeg.S
   7
   8 local M = {_NAME = 'toml'}
   9
  10 -- Whitespace
  11 local indent = #l.starts_line(S(' \t')) *
  12                (token(l.WHITESPACE, ' ') + token('indent_error', '\t'))^1
  13 local ws = token(l.WHITESPACE, S(' \t')^1 + l.newline^1)
  14
  15 -- Comments.
  16 local comment = token(l.COMMENT, '#' * l.nonnewline^0)
  17
  18 -- Strings.
  19 local string = token(l.STRING, l.delimited_range("'") + l.delimited_range('"'))
  20
  21 -- Numbers.
  22 local number = token(l.NUMBER, l.float + l.integer)
  23
  24 -- Datetime.
  25 local ts = token('timestamp', l.digit * l.digit * l.digit * l.digit * -- year
  26                               '-' * l.digit * l.digit^-1 * -- month
  27                               '-' * l.digit * l.digit^-1 * -- day
  28                               ((S(' \t')^1 + S('tT'))^-1 * -- separator
  29                                l.digit * l.digit^-1 * -- hour
  30                                ':' * l.digit * l.digit * -- minute
  31                                ':' * l.digit * l.digit * -- second
  32                                ('.' * l.digit^0)^-1 * -- fraction
  33                                ('Z' + -- timezone
  34                                 S(' \t')^0 * S('-+') * l.digit * l.digit^-1 *
  35                                 (':' * l.digit * l.digit)^-1)^-1)^-1)
  36
  37 -- kewwords.
  38 local keyword = token(l.KEYWORD, word_match{
  39   'true', 'false'
  40 })
  41
  42
  43 -- Identifiers.
  44 local identifier = token(l.IDENTIFIER, l.word)
  45
  46 -- Operators.
  47 local operator = token(l.OPERATOR, S('#=+-,.{}[]()'))
  48
  49 M._rules = {
  50   {'indent', indent},
  51   {'whitespace', ws},
  52   {'keyword', keyword},
  53   {'identifier', identifier},
  54   {'operator', operator},
  55   {'string', string},
  56   {'comment', comment},
  57   {'number', number},
  58   {'timestamp', ts},
  59 }
  60
  61 M._tokenstyles = {
  62   indent_error = 'back:red',
  63   timestamp = l.STYLE_NUMBER,
  64 }
  65
  66 M._FOLDBYINDENTATION = true
  67
  68 return M