Added optional Lua lexer support.

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

1 files changed, 90 insertions, 0 deletions

diff --git a/lexlua/ansi_c.lua b/lexlua/ansi_c.lua
new file mode 100644
index 000000000..4f961e67b
--- /dev/null
+++ b/lexlua/ansi_c.lua
@@ -0,0 +1,90 @@
+-- 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('ansi_c')
+
+-- Whitespace.
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Keywords.
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
+  auto break case const continue default do else extern for goto if inline
+  register restrict return sizeof static switch typedef volatile while
+  -- C11.
+  _Alignas _Alignof _Atomic _Generic _Noreturn _Static_assert _Thread_local
+]]))
+
+-- Types.
+lex:add_rule('type', token(lexer.TYPE, word_match[[
+  char double enum float int long short signed struct union unsigned void
+  _Bool _Complex _Imaginary
+  -- Stdlib types.
+  ptrdiff_t size_t max_align_t wchar_t intptr_t uintptr_t intmax_t uintmax_t
+]] + P('u')^-1 * 'int' * (P('_least') + '_fast')^-1 * R('09')^1 * '_t'))
+
+-- Constants.
+lex:add_rule('constants', token(lexer.CONSTANT, word_match[[
+  NULL
+  -- Preprocessor.
+  __DATE__ __FILE__ __LINE__ __TIME__ __func__
+  -- errno.h.
+  E2BIG EACCES EADDRINUSE EADDRNOTAVAIL EAFNOSUPPORT EAGAIN EALREADY EBADF
+  EBADMSG EBUSY ECANCELED ECHILD ECONNABORTED ECONNREFUSED ECONNRESET EDEADLK
+  EDESTADDRREQ EDOM EDQUOT EEXIST EFAULT EFBIG EHOSTUNREACH EIDRM EILSEQ
+  EINPROGRESS EINTR EINVAL EIO EISCONN EISDIR ELOOP EMFILE EMLINK EMSGSIZE
+  EMULTIHOP ENAMETOOLONG ENETDOWN ENETRESET ENETUNREACH ENFILE ENOBUFS ENODATA
+  ENODEV ENOENT ENOEXEC ENOLCK ENOLINK ENOMEM ENOMSG ENOPROTOOPT ENOSPC ENOSR
+  ENOSTR ENOSYS ENOTCONN ENOTDIR ENOTEMPTY ENOTRECOVERABLE ENOTSOCK ENOTSUP
+  ENOTTY ENXIO EOPNOTSUPP EOVERFLOW EOWNERDEAD EPERM EPIPE EPROTO
+  EPROTONOSUPPORT EPROTOTYPE ERANGE EROFS ESPIPE ESRCH ESTALE ETIME ETIMEDOUT
+  ETXTBSY EWOULDBLOCK EXDEV
+]]))
+
+-- Identifiers.
+lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
+
+-- 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))
+
+-- Comments.
+local line_comment = '//' * lexer.nonnewline_esc^0
+local block_comment = '/*' * (lexer.any - '*/')^0 * P('*/')^-1 +
+                      lexer.starts_line('#if') * S(' \t')^0 * '0' *
+                      lexer.space *
+                      (lexer.any - lexer.starts_line('#endif'))^0 *
+                      (lexer.starts_line('#endif'))^-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 if ifdef ifndef line pragma undef
+]]
+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