Added optional Lua lexer support.

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

1 files changed, 66 insertions, 0 deletions

diff --git a/lexlua/nemerle.lua b/lexlua/nemerle.lua
new file mode 100644
index 000000000..9941c1a95
--- /dev/null
+++ b/lexlua/nemerle.lua
@@ -0,0 +1,66 @@
+-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
+-- Nemerle 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('nemerle')
+
+-- Whitespace.
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Keywords.
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
+  _ abstract and array as base catch class def do else extends extern finally
+  foreach for fun if implements in interface internal lock macro match module
+  mutable namespace new out override params private protected public ref repeat
+  sealed static struct syntax this throw try type typeof unless until using
+  variant virtual when where while
+  -- Values.
+  null true false
+]]))
+
+-- Types.
+lex:add_rule('type', token(lexer.TYPE, word_match[[
+  bool byte char decimal double float int list long object sbyte short string
+  uint ulong ushort void
+]]))
+
+-- Strings.
+local sq_str = P('L')^-1 * lexer.delimited_range("'", true)
+local dq_str = P('L')^-1 * lexer.delimited_range('"', true)
+lex:add_rule('string', token(lexer.STRING, sq_str + dq_str))
+
+-- Identifiers.
+lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
+
+-- 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))
+
+-- Preprocessor.
+local preproc_word = word_match[[
+  define elif else endif endregion error if ifdef ifndef line pragma region
+  undef using warning
+]]
+lex:add_rule('preproc', token(lexer.PREPROCESSOR, lexer.starts_line('#') *
+                                                  S('\t ')^0 * preproc_word))
+
+-- Operators.
+lex:add_rule('operator', token(lexer.OPERATOR, S('+-/*%<>!=^&|?~:;.()[]{}')))
+
+-- Fold points.
+lex:add_fold_point(lexer.PREPROCESSOR, 'region', 'endregion')
+lex:add_fold_point(lexer.PREPROCESSOR, 'if', 'endif')
+lex:add_fold_point(lexer.PREPROCESSOR, 'ifdef', 'endif')
+lex:add_fold_point(lexer.PREPROCESSOR, 'ifndef', 'endif')
+lex:add_fold_point(lexer.OPERATOR, '{', '}')
+lex:add_fold_point(lexer.COMMENT, '/*', '*/')
+lex:add_fold_point(lexer.COMMENT, '//', lexer.fold_line_comments('//'))
+
+return lex