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-- Copyright 2015-2017 Alejandro Baez (https://keybase.io/baez). See LICENSE.
-- TOML LPeg lexer.
local l = require("lexer")
local token, word_match = l.token, l.word_match
local P, R, S = lpeg.P, lpeg.R, lpeg.S
local M = {_NAME = 'toml'}
-- Whitespace
local ws = token(l.WHITESPACE, S(' \t')^1 + l.newline^1)
-- Comments.
local comment = token(l.COMMENT, '#' * l.nonnewline^0)
-- Strings.
local string = token(l.STRING, l.delimited_range("'") + l.delimited_range('"'))
-- Numbers.
local number = token(l.NUMBER, l.float + l.integer)
-- Datetime.
local ts = token('timestamp', l.digit * l.digit * l.digit * l.digit * -- year
'-' * l.digit * l.digit^-1 * -- month
'-' * l.digit * l.digit^-1 * -- day
((S(' \t')^1 + S('tT'))^-1 * -- separator
l.digit * l.digit^-1 * -- hour
':' * l.digit * l.digit * -- minute
':' * l.digit * l.digit * -- second
('.' * l.digit^0)^-1 * -- fraction
('Z' + -- timezone
S(' \t')^0 * S('-+') * l.digit * l.digit^-1 *
(':' * l.digit * l.digit)^-1)^-1)^-1)
-- kewwords.
local keyword = token(l.KEYWORD, word_match{
'true', 'false'
})
-- Identifiers.
local identifier = token(l.IDENTIFIER, l.word)
-- Operators.
local operator = token(l.OPERATOR, S('=+-,.{}[]()'))
M._rules = {
{'whitespace', ws},
{'keyword', keyword},
{'identifier', identifier},
{'operator', operator},
{'string', string},
{'comment', comment},
{'number', number},
{'timestamp', ts},
}
M._tokenstyles = {
timestamp = l.STYLE_NUMBER,
}
M._FOLDBYINDENTATION = true
return M
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