Added optional Lua lexer support.

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

1 files changed, 61 insertions, 0 deletions

diff --git a/lexlua/scala.lua b/lexlua/scala.lua
new file mode 100644
index 000000000..c7119c321
--- /dev/null
+++ b/lexlua/scala.lua
@@ -0,0 +1,61 @@
+-- Copyright 2006-2018 JMS. See License.txt.
+-- Scala 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('scala')
+
+-- Whitespace.
+local ws = token(lexer.WHITESPACE, lexer.space^1)
+lex:add_rule('whitespace', ws)
+
+-- Classes.
+lex:add_rule('class', token(lexer.KEYWORD, P('class')) * ws^1 *
+                      token(lexer.CLASS, lexer.word))
+
+-- Keywords.
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
+  abstract case catch class def do else extends false final finally for forSome
+  if implicit import lazy match new null object override package private
+  protected return sealed super this throw trait try true type val var while
+  with yield
+]]))
+
+-- Types.
+lex:add_rule('type', token(lexer.TYPE, word_match[[
+  Array Boolean Buffer Byte Char Collection Double Float Int Iterator LinkedList
+  List Long Map None Option Set Short SortedMap SortedSet String TreeMap TreeSet
+]]))
+
+-- Functions.
+lex:add_rule('function', token(lexer.FUNCTION, lexer.word) * #P('('))
+
+-- Identifiers.
+lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
+
+-- Strings.
+local symbol = "'" * lexer.word
+local dq_str = lexer.delimited_range('"', true)
+local tq_str = '"""' * (lexer.any - '"""')^0 * P('"""')^-1
+lex:add_rule('string', token(lexer.STRING, tq_str + symbol + dq_str))
+
+-- Comments.
+local line_comment = '//' * lexer.nonnewline_esc^0
+local block_comment = '/*' * (lexer.any - '*/')^0 * P('*/')^-1
+lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
+
+-- Numbers.
+lex:add_rule('number', token(lexer.NUMBER, (lexer.float + lexer.integer) *
+                                           S('LlFfDd')^-1))
+
+-- Operators.
+lex:add_rule('operator', token(lexer.OPERATOR, S('+-/*%<>!=^&|?~:;.()[]{}')))
+
+-- Fold points.
+lex:add_fold_point(lexer.OPERATOR, '{', '}')
+lex:add_fold_point(lexer.COMMENT, '/*', '*/')
+lex:add_fold_point(lexer.COMMENT, '//', lexer.fold_line_comments('//'))
+
+return lex