Added optional Lua lexer support.

This support is disabled by default and must be enabled via compile-time option.

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