lexers/vala.lua

   1 -- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
   2 -- Vala LPeg lexer.
   3
   4 local l = require('lexer')
   5 local token, word_match = l.token, l.word_match
   6 local P, R, S = lpeg.P, lpeg.R, lpeg.S
   7
   8 local M = {_NAME = 'vala'}
   9
  10 -- Whitespace.
  11 local ws = token(l.WHITESPACE, l.space^1)
  12
  13 -- Comments.
  14 local line_comment = '//' * l.nonnewline_esc^0
  15 local block_comment = '/*' * (l.any - '*/')^0 * P('*/')^-1
  16 local comment = token(l.COMMENT, line_comment + block_comment)
  17
  18 -- Strings.
  19 local sq_str = l.delimited_range("'", true)
  20 local dq_str = l.delimited_range('"', true)
  21 local tq_str = '"""' * (l.any - '"""')^0 * P('"""')^-1
  22 local ml_str = '@' * l.delimited_range('"', false, true)
  23 local string = token(l.STRING, tq_str + sq_str + dq_str + ml_str)
  24
  25 -- Numbers.
  26 local number = token(l.NUMBER, (l.float + l.integer) * S('uUlLfFdDmM')^-1)
  27
  28 -- Keywords.
  29 local keyword = token(l.KEYWORD, word_match{
  30   'class', 'delegate', 'enum', 'errordomain', 'interface', 'namespace',
  31   'signal', 'struct', 'using',
  32   -- Modifiers.
  33   'abstract', 'const', 'dynamic', 'extern', 'inline', 'out', 'override',
  34   'private', 'protected', 'public', 'ref', 'static', 'virtual', 'volatile',
  35   'weak',
  36   -- Other.
  37   'as', 'base', 'break', 'case', 'catch', 'construct', 'continue', 'default',
  38   'delete', 'do', 'else', 'ensures', 'finally', 'for', 'foreach', 'get', 'if',
  39   'in', 'is', 'lock', 'new', 'requires', 'return', 'set', 'sizeof', 'switch',
  40   'this', 'throw', 'throws', 'try', 'typeof', 'value', 'var', 'void', 'while',
  41   -- Etc.
  42   'null', 'true', 'false'
  43 })
  44
  45 -- Types.
  46 local type = token(l.TYPE, word_match{
  47   'bool', 'char', 'double', 'float', 'int', 'int8', 'int16', 'int32', 'int64',
  48   'long', 'short', 'size_t', 'ssize_t', 'string', 'uchar', 'uint', 'uint8',
  49   'uint16', 'uint32', 'uint64', 'ulong', 'unichar', 'ushort'
  50 })
  51
  52 -- Identifiers.
  53 local identifier = token(l.IDENTIFIER, l.word)
  54
  55 -- Operators.
  56 local operator = token(l.OPERATOR, S('+-/*%<>!=^&|?~:;.()[]{}'))
  57
  58 M._rules = {
  59   {'whitespace', ws},
  60   {'keyword', keyword},
  61   {'type', type},
  62   {'identifier', identifier},
  63   {'string', string},
  64   {'comment', comment},
  65   {'number', number},
  66   {'operator', operator},
  67 }
  68
  69 M._foldsymbols = {
  70   _patterns = {'[{}]', '/%*', '%*/', '//'},
  71   [l.OPERATOR] = {['{'] = 1, ['}'] = -1},
  72   [l.COMMENT] = {['/*'] = 1, ['*/'] = -1, ['//'] = l.fold_line_comments('//')}
  73 }
  74
  75 return M