vis

a vi-like editor based on Plan 9's structural regular expressions
objeck.lua

(2015B)
      1 -- Copyright 2023-2025 Mitchell. See LICENSE.
      2 -- Objeck LPeg lexer.
      3 
      4 local lexer = lexer
      5 local P, S = lpeg.P, lpeg.S
      6 
      7 local lex = lexer.new(...)
      8 
      9 -- Keywords.
     10 lex:add_rule('keyword', lex:tag(lexer.KEYWORD, lex:word_match(lexer.KEYWORD)))
     11 
     12 -- Types.
     13 lex:add_rule('type', lex:tag(lexer.TYPE, lex:word_match(lexer.TYPE)))
     14 
     15 -- Identifiers.
     16 lex:add_rule('identifier', lex:tag(lexer.IDENTIFIER, lexer.word))
     17 
     18 -- Class variables.
     19 lex:add_rule('variable', lex:tag(lexer.VARIABLE, '@' * lexer.word))
     20 
     21 -- Comments.
     22 local line_comment = lexer.to_eol('#', true)
     23 local block_comment = lexer.range('#~', '~#')
     24 lex:add_rule('comment', lex:tag(lexer.COMMENT, block_comment + line_comment))
     25 
     26 -- Strings.
     27 local sq_str = lexer.range("'", true)
     28 local dq_str = lexer.range('"', true)
     29 local ml_str = lexer.range('"', false, false)
     30 lex:add_rule('string', lex:tag(lexer.STRING, sq_str + ml_str + dq_str))
     31 
     32 -- Numbers.
     33 lex:add_rule('number', lex:tag(lexer.NUMBER, lexer.number))
     34 
     35 -- Operators.
     36 lex:add_rule('operator', lex:tag(lexer.OPERATOR, S('~!.,:;+-*/<>=\\^|&%?()[]{}')))
     37 
     38 -- Fold points.
     39 lex:add_fold_point(lexer.OPERATOR, '{', '}')
     40 lex:add_fold_point(lexer.COMMENT, '#~', '~#')
     41 
     42 -- Word lists.
     43 lex:set_word_list(lexer.KEYWORD, {
     44 	'class', 'method', 'function', 'public', 'abstract', 'private', 'static', 'native', 'virtual',
     45 	'Parent', 'As', 'from', 'implements', 'interface', 'enum', 'alias', 'consts', 'bundle', 'use',
     46 	'leaving', 'if', 'else', 'do', 'while', 'select', 'break', 'continue', 'other', 'for', 'each',
     47 	'reverse', 'label', 'return', 'critical', 'New', 'and', 'or', 'xor', 'true', 'false' -- , 'Nil'
     48 })
     49 
     50 lex:set_word_list(lexer.TYPE, {
     51 	'Nil', 'Byte', 'ByteHolder', 'Int', 'IntHolder', 'Float', 'FloatHolder', 'Char', 'CharHolder',
     52 	'Bool', 'BoolHolder', 'String', 'BaseArrayHolder', 'BoolArrayHolder', 'ByteArrayHolder',
     53 	'CharArrayHolder', 'FloatArrayHolder', 'IntArrayHolder', 'StringArrayHolder', 'Func2Holder',
     54 	'Func3Holder', 'Func4Holder', 'FuncHolder'
     55 })
     56 
     57 lexer.property['scintillua.comment'] = '#'
     58 
     59 return lex