Added optional Lua lexer support.

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

1 files changed, 43 insertions, 0 deletions

diff --git a/lexlua/ini.lua b/lexlua/ini.lua
new file mode 100644
index 000000000..907788405
--- /dev/null
+++ b/lexlua/ini.lua
@@ -0,0 +1,43 @@
+-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
+-- Ini 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('ini')
+
+-- Whitespace.
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Keywords.
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
+  true false on off yes no
+]]))
+
+-- Identifiers.
+lex:add_rule('identifier', token(lexer.IDENTIFIER, (lexer.alpha + '_') *
+                                                   (lexer.alnum + S('_.'))^0))
+
+-- Strings.
+lex:add_rule('string', token(lexer.STRING, lexer.delimited_range("'") +
+                                           lexer.delimited_range('"')))
+
+-- Labels.
+lex:add_rule('label', token(lexer.LABEL,
+                            lexer.delimited_range('[]', true, true)))
+
+-- Comments.
+lex:add_rule('comment', token(lexer.COMMENT, lexer.starts_line(S(';#')) *
+                                             lexer.nonnewline^0))
+
+-- Numbers.
+local dec = lexer.digit^1 * ('_' * lexer.digit^1)^0
+local oct_num = '0' * S('01234567_')^1
+local integer = S('+-')^-1 * (lexer.hex_num + oct_num + dec)
+lex:add_rule('number', token(lexer.NUMBER, lexer.float + integer))
+
+-- Operators.
+lex:add_rule('operator', token(lexer.OPERATOR, '='))
+
+return lex