Added optional Lua lexer support.

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

1 files changed, 71 insertions, 0 deletions

diff --git a/lexlua/objective_c.lua b/lexlua/objective_c.lua
new file mode 100644
index 000000000..3d2f02ebb
--- /dev/null
+++ b/lexlua/objective_c.lua
@@ -0,0 +1,71 @@
+-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
+-- Objective 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('objective_c')
+
+-- Whitespace.
+lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
+
+-- Keywords.
+lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
+  -- From C.
+  asm auto break case const continue default do else extern false for goto if
+  inline register return sizeof static switch true typedef void volatile while
+  restrict _Bool _Complex _Pragma _Imaginary
+  -- Objective C.
+  oneway in out inout bycopy byref self super
+  -- Preprocessor directives.
+  @interface @implementation @protocol @end @private @protected @public @class
+  @selector @encode @defs @synchronized @try @throw @catch @finally
+  -- Constants.
+  TRUE FALSE YES NO NULL nil Nil METHOD_NULL
+]]))
+
+-- Types.
+lex:add_rule('type', token(lexer.TYPE, word_match[[
+  apply_t id Class MetaClass Object Protocol retval_t SEL STR IMP BOOL
+  TypedStream
+]]))
+
+-- 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 include line pragma undef
+  warning
+]]
+lex:add_rule('preprocessor', #lexer.starts_line('#') *
+                             token(lexer.PREPROCESSOR, '#' * S('\t ')^0 *
+                                                       preproc_word))
+
+-- Operators.
+lex:add_rule('operator', token(lexer.OPERATOR, S('+-/*%<>!=^&|?~:;.()[]{}')))
+
+-- Fold symbols.
+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