vis

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

(2142B)
      1 -- Copyright 2006-2025 Mitchell. See LICENSE.
      2 -- Vala LPeg lexer.
      3 
      4 local lexer = require('lexer')
      5 local token, word_match = lexer.token, lexer.word_match
      6 local P, S = lpeg.P, lpeg.S
      7 
      8 local lex = lexer.new('vala')
      9 
     10 -- Whitespace.
     11 lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
     12 
     13 -- Keywords.
     14 lex:add_rule('keyword', token(lexer.KEYWORD, word_match{
     15 	'class', 'delegate', 'enum', 'errordomain', 'interface', 'namespace', 'signal', 'struct', 'using',
     16 	-- Modifiers.
     17 	'abstract', 'const', 'dynamic', 'extern', 'inline', 'out', 'override', 'private', 'protected',
     18 	'public', 'ref', 'static', 'virtual', 'volatile', 'weak',
     19 	-- Other.
     20 	'as', 'base', 'break', 'case', 'catch', 'construct', 'continue', 'default', 'delete', 'do',
     21 	'else', 'ensures', 'finally', 'for', 'foreach', 'get', 'if', 'in', 'is', 'lock', 'new',
     22 	'requires', 'return', 'set', 'sizeof', 'switch', 'this', 'throw', 'throws', 'try', 'typeof',
     23 	'value', 'var', 'void', 'while',
     24 	-- Etc.
     25 	'null', 'true', 'false'
     26 }))
     27 
     28 -- Types.
     29 lex:add_rule('type', token(lexer.TYPE, word_match{
     30 	'bool', 'char', 'double', 'float', 'int', 'int8', 'int16', 'int32', 'int64', 'long', 'short',
     31 	'size_t', 'ssize_t', 'string', 'uchar', 'uint', 'uint8', 'uint16', 'uint32', 'uint64', 'ulong',
     32 	'unichar', 'ushort'
     33 }))
     34 
     35 -- Identifiers.
     36 lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
     37 
     38 -- Strings.
     39 local sq_str = lexer.range("'", true)
     40 local dq_str = lexer.range('"', true)
     41 local tq_str = lexer.range('"""')
     42 local ml_str = '@' * lexer.range('"', false, false)
     43 lex:add_rule('string', token(lexer.STRING, tq_str + sq_str + dq_str + ml_str))
     44 
     45 -- Comments.
     46 local line_comment = lexer.to_eol('//', true)
     47 local block_comment = lexer.range('/*', '*/')
     48 lex:add_rule('comment', token(lexer.COMMENT, line_comment + block_comment))
     49 
     50 -- Numbers.
     51 lex:add_rule('number', token(lexer.NUMBER, lexer.number * S('uUlLfFdDmM')^-1))
     52 
     53 -- Operators.
     54 lex:add_rule('operator', token(lexer.OPERATOR, S('+-/*%<>!=^&|?~:;.()[]{}')))
     55 
     56 -- Fold points.
     57 lex:add_fold_point(lexer.OPERATOR, '{', '}')
     58 lex:add_fold_point(lexer.COMMENT, '/*', '*/')
     59 
     60 lexer.property['scintillua.comment'] = '//'
     61 
     62 return lex