Added optional Lua lexer support.

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

1 files changed, 22 insertions, 0 deletions

diff --git a/lexlua/litcoffee.lua b/lexlua/litcoffee.lua
new file mode 100644
index 000000000..d122ae2db
--- /dev/null
+++ b/lexlua/litcoffee.lua
@@ -0,0 +1,22 @@
+-- Copyright 2006-2018 Robert Gieseke. See License.txt.
+-- Literate CoffeeScript LPeg lexer.
+-- http://coffeescript.org/#literate
+
+local lexer = require('lexer')
+local token = lexer.token
+local P, S = lpeg.P, lpeg.S
+
+local lex = lexer.new('litcoffee', {inherit = lexer.load('markdown')})
+
+-- Embedded CoffeeScript.
+local coffeescript = lexer.load('coffeescript')
+local coffee_start_rule = token(lexer.STYLE_EMBEDDED, (P(' ')^4 + P('\t')))
+local coffee_end_rule = token(lexer.STYLE_EMBEDDED, lexer.newline)
+lex:embed(coffeescript, coffee_start_rule, coffee_end_rule)
+
+-- Use 'markdown_whitespace' instead of lexer.WHITESPACE since the latter would
+-- expand to 'litcoffee_whitespace'.
+lex:modify_rule('whitespace', token('markdown_whitespace', S(' \t')^1 +
+                                                           S('\r\n')^1))
+
+return lex