Added optional Lua lexer support.

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

1 files changed, 31 insertions, 0 deletions

diff --git a/lexlua/lilypond.lua b/lexlua/lilypond.lua
new file mode 100644
index 000000000..6f68e8249
--- /dev/null
+++ b/lexlua/lilypond.lua
@@ -0,0 +1,31 @@
+-- Copyright 2006-2018 Robert Gieseke. See License.txt.
+-- Lilypond LPeg lexer.
+-- TODO Embed Scheme; Notes?, Numbers?
+
+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('lilypond')
+
+-- Whitespace.
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Keywords, commands.
+lex:add_rule('keyword', token(lexer.KEYWORD, '\\' * lexer.word))
+
+-- Identifiers.
+lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
+
+-- Strings.
+lex:add_rule('string', token(lexer.STRING,
+                             lexer.delimited_range('"', false, true)))
+
+-- Comments.
+-- TODO: block comment.
+lex:add_rule('comment', token(lexer.COMMENT, '%' * lexer.nonnewline^0))
+
+-- Operators.
+lex:add_rule('operator', token(lexer.OPERATOR, S("{}'~<>|")))
+
+return lex