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Diffstat (limited to 'lexlua/toml.lua')
-rw-r--r-- | lexlua/toml.lua | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/lexlua/toml.lua b/lexlua/toml.lua new file mode 100644 index 000000000..ba8ec9be1 --- /dev/null +++ b/lexlua/toml.lua @@ -0,0 +1,53 @@ +-- 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 |