Added optional Lua lexer support.

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

1 files changed, 68 insertions, 0 deletions

diff --git a/lexlua/csharp.lua b/lexlua/csharp.lua
new file mode 100644
index 000000000..4263c6672
--- /dev/null
+++ b/lexlua/csharp.lua
@@ -0,0 +1,68 @@
+-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
+-- C# 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('csharp')
+
+-- Whitespace.
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Keywords.
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
+  class delegate enum event interface namespace struct using abstract const
+  explicit extern fixed implicit internal lock out override params partial
+  private protected public ref sealed static readonly unsafe virtual volatile
+  add as assembly base break case catch checked continue default do else finally
+  for foreach get goto if in is new remove return set sizeof stackalloc super
+  switch this throw try typeof unchecked value void while yield
+  null true false
+]]))
+
+-- Types.
+lex:add_rule('type', token(lexer.TYPE, word_match[[
+  bool byte char decimal double float int long object operator sbyte short
+  string uint ulong ushort
+]]))
+
+-- 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))
+
+-- Strings.
+local sq_str = lexer.delimited_range("'", true)
+local dq_str = lexer.delimited_range('"', true)
+local ml_str = P('@')^-1 * lexer.delimited_range('"', false, true)
+lex:add_rule('string', token(lexer.STRING, sq_str + dq_str + ml_str))
+
+-- Numbers.
+lex:add_rule('number', token(lexer.NUMBER, (lexer.float + lexer.integer) *
+                                           S('lLdDfFMm')^-1))
+
+-- Preprocessor.
+local preproc_word = word_match[[
+  define elif else endif error if line undef warning region endregion
+]]
+lex:add_rule('preprocessor', 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, 'if', 'endif')
+lex:add_fold_point(lexer.PREPROCESSOR, 'ifdef', 'endif')
+lex:add_fold_point(lexer.PREPROCESSOR, 'ifndef', 'endif')
+lex:add_fold_point(lexer.PREPROCESSOR, 'region', 'endregion')
+lex:add_fold_point(lexer.OPERATOR, '{', '}')
+lex:add_fold_point(lexer.COMMENT, '/*', '*/')
+lex:add_fold_point(lexer.COMMENT, '//', lexer.fold_line_comments('//'))
+
+return lex