From 519b7328b66c4c84f03893a31e4be5ba6b1395f2 Mon Sep 17 00:00:00 2001
From: mitchell <unknown>
Date: Sun, 11 Mar 2018 23:04:41 -0400
Subject: Added optional Lua lexer support. This support is disabled by default
 and must be enabled via compile-time option.

---
 lexlua/cpp.lua | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 lexlua/cpp.lua

(limited to 'lexlua/cpp.lua')

diff --git a/lexlua/cpp.lua b/lexlua/cpp.lua
new file mode 100644
index 000000000..277b820e8
--- /dev/null
+++ b/lexlua/cpp.lua
@@ -0,0 +1,75 @@
+-- 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('cpp')
+
+-- Whitespace.
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Keywords.
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
+  asm auto break case catch class const const_cast continue default delete do
+  dynamic_cast else explicit export extern false for friend goto if inline
+  mutable namespace new operator private protected public register
+  reinterpret_cast return sizeof static static_cast switch template this throw
+  true try typedef typeid typename using virtual volatile while
+  -- Operators.
+  and and_eq bitand bitor compl not not_eq or or_eq xor xor_eq
+  -- C++11.
+  alignas alignof constexpr decltype final noexcept override static_assert
+  thread_local
+]]))
+
+-- Types.
+lex:add_rule('type', token(lexer.TYPE, word_match[[
+  bool char double enum float int long short signed struct union unsigned void
+  wchar_t
+  -- C++11.
+  char16_t char32_t nullptr
+]]))
+
+-- 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 error if ifdef ifndef import line pragma undef using
+  warning
+]]
+lex:add_rule('preprocessor',
+             #lexer.starts_line('#') *
+             (token(lexer.PREPROCESSOR, '#' * S('\t ')^0 * preproc_word) +
+              token(lexer.PREPROCESSOR, '#' * S('\t ')^0 * 'include') *
+              (token(lexer.WHITESPACE, S('\t ')^1) *
+               token(lexer.STRING,
+                     lexer.delimited_range('<>', true, true)))^-1))
+
+-- 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.OPERATOR, '{', '}')
+lex:add_fold_point(lexer.COMMENT, '/*', '*/')
+lex:add_fold_point(lexer.COMMENT, '//', lexer.fold_line_comments('//'))
+
+return lex
-- 
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