54 lines
2.0 KiB
Lua
54 lines
2.0 KiB
Lua
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-- Copyright 2015-2019 Alejandro Baez (https://keybase.io/baez). See License.txt.
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-- TOML LPeg lexer.
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local lexer = require("lexer")
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local token, word_match = lexer.token, lexer.word_match
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local P, R, S = lpeg.P, lpeg.R, lpeg.S
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local lex = lexer.new('toml', {fold_by_indentation = true})
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-- Whitespace
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lex:add_rule('indent', #lexer.starts_line(S(' \t')) *
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(token(lexer.WHITESPACE, ' ') +
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token('indent_error', '\t'))^1)
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lex:add_rule('whitespace', token(lexer.WHITESPACE, S(' \t')^1 +
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lexer.newline^1))
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lex:add_style('indent_error', 'back:%(color.red)')
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-- kewwords.
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lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[true false]]))
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-- Identifiers.
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lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
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-- Strings.
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lex:add_rule('string', token(lexer.STRING, lexer.delimited_range("'") +
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lexer.delimited_range('"')))
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-- Comments.
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lex:add_rule('comment', token(lexer.COMMENT, '#' * lexer.nonnewline^0))
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-- Operators.
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lex:add_rule('operator', token(lexer.OPERATOR, S('#=+-,.{}[]()')))
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-- Datetime.
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lex:add_rule('datetime',
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token('timestamp',
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lexer.digit * lexer.digit * lexer.digit * lexer.digit * -- yr
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'-' * lexer.digit * lexer.digit^-1 * -- month
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'-' * lexer.digit * lexer.digit^-1 * -- day
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((S(' \t')^1 + S('tT'))^-1 * -- separator
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lexer.digit * lexer.digit^-1 * -- hour
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':' * lexer.digit * lexer.digit * -- minute
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':' * lexer.digit * lexer.digit * -- second
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('.' * lexer.digit^0)^-1 * -- fraction
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('Z' + -- timezone
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S(' \t')^0 * S('-+') * lexer.digit * lexer.digit^-1 *
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(':' * lexer.digit * lexer.digit)^-1)^-1)^-1))
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lex:add_style('timestamp', lexer.STYLE_NUMBER)
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-- Numbers.
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lex:add_rule('number', token(lexer.NUMBER, lexer.float + lexer.integer))
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return lex
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