-- Copyright 2015-2018 Alejandro Baez (https://keybase.io/baez). See License.txt.
|
-- TOML LPeg lexer.
|
|
local lexer = require("lexer")
|
local token, word_match = lexer.token, lexer.word_match
|
local P, R, S = lpeg.P, lpeg.R, lpeg.S
|
|
local lex = lexer.new('toml', {fold_by_indentation = true})
|
|
-- Whitespace
|
lex:add_rule('indent', #lexer.starts_line(S(' \t')) *
|
(token(lexer.WHITESPACE, ' ') +
|
token('indent_error', '\t'))^1)
|
lex:add_rule('whitespace', token(lexer.WHITESPACE, S(' \t')^1 +
|
lexer.newline^1))
|
lex:add_style('indent_error', 'back:%(color.red)')
|
|
-- kewwords.
|
lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[true false]]))
|
|
-- Identifiers.
|
lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
|
|
-- Strings.
|
lex:add_rule('string', token(lexer.STRING, lexer.delimited_range("'") +
|
lexer.delimited_range('"')))
|
|
-- Comments.
|
lex:add_rule('comment', token(lexer.COMMENT, '#' * lexer.nonnewline^0))
|
|
-- Operators.
|
lex:add_rule('operator', token(lexer.OPERATOR, S('#=+-,.{}[]()')))
|
|
-- Datetime.
|
lex:add_rule('datetime',
|
token('timestamp',
|
lexer.digit * lexer.digit * lexer.digit * lexer.digit * -- yr
|
'-' * lexer.digit * lexer.digit^-1 * -- month
|
'-' * lexer.digit * lexer.digit^-1 * -- day
|
((S(' \t')^1 + S('tT'))^-1 * -- separator
|
lexer.digit * lexer.digit^-1 * -- hour
|
':' * lexer.digit * lexer.digit * -- minute
|
':' * lexer.digit * lexer.digit * -- second
|
('.' * lexer.digit^0)^-1 * -- fraction
|
('Z' + -- timezone
|
S(' \t')^0 * S('-+') * lexer.digit * lexer.digit^-1 *
|
(':' * lexer.digit * lexer.digit)^-1)^-1)^-1))
|
lex:add_style('timestamp', lexer.STYLE_NUMBER)
|
|
-- Numbers.
|
lex:add_rule('number', token(lexer.NUMBER, lexer.float + lexer.integer))
|
|
return lex
|
