1 files changed, 50 insertions, 0 deletions
diff --git a/lua/lexers/coffeescript.lua b/lua/lexers/coffeescript.lua
new file mode 100644
index 0000000..c698d6e
--- /dev/null
+++ b/lua/lexers/coffeescript.lua
@@ -0,0 +1,50 @@
+-- Copyright 2006-2024 Mitchell. See LICENSE.
+-- CoffeeScript LPeg lexer.
+
+local lexer = require('lexer')
+local word_match = lexer.word_match
+local P, S = lpeg.P, lpeg.S
+
+local lex = lexer.new('coffeescript', {fold_by_indentation = true})
+
+-- Whitespace.
+lex:add_rule('whitespace', lex:tag(lexer.WHITESPACE, lexer.space^1))
+
+-- Keywords.
+lex:add_rule('keyword', lex:tag(lexer.KEYWORD, word_match{
+  'all', 'and', 'bind', 'break', 'by', 'case', 'catch', 'class', 'const', 'continue', 'default',
+  'delete', 'do', 'each', 'else', 'enum', 'export', 'extends', 'false', 'finally', 'for',
+  'function', 'if', 'import', 'in', 'instanceof', 'is', 'isnt', 'let', 'loop', 'native', 'new',
+  'no', 'not', 'of', 'off', 'on', 'or', 'return', 'super', 'switch', 'then', 'this', 'throw',
+  'true', 'try', 'typeof', 'unless', 'until', 'var', 'void', 'when', 'while', 'with', 'yes'
+}))
+
+-- Fields: object properties and methods.
+lex:add_rule('field',
+  lex:tag(lexer.FUNCTION, '.' * (S('_$') + lexer.alpha) * (S('_$') + lexer.alnum)^0))
+
+-- Identifiers.
+lex:add_rule('identifier', lex:tag(lexer.IDENTIFIER, lexer.word))
+
+-- Strings.
+local sq_str = lexer.range("'")
+local dq_str = lexer.range('"')
+local string = lex:tag(lexer.STRING, sq_str + dq_str)
+local regex_str = lexer.after_set('+-*%<>!=^&|?~:;,([{', lexer.range('/', true) * S('igm')^0)
+local regex = lex:tag(lexer.REGEX, regex_str)
+lex:add_rule('string', string + regex)
+
+-- Comments.
+local block_comment = lexer.range('###')
+local line_comment = lexer.to_eol('#', true)
+lex:add_rule('comment', lex:tag(lexer.COMMENT, block_comment + line_comment))
+
+-- Numbers.
+lex:add_rule('number', lex:tag(lexer.NUMBER, lexer.number))
+
+-- Operators.
+lex:add_rule('operator', lex:tag(lexer.OPERATOR, S('+-/*%<>!=^&|?~:;,.()[]{}')))
+
+lexer.property['scintillua.comment'] = '#'
+
+return lex