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-- Copyright 2006-2017 Mitchell mitchell.att.foicica.com. See LICENSE.
-- VisualBasic LPeg lexer.
local l = require('lexer')
local token, word_match = l.token, l.word_match
local P, R, S = lpeg.P, lpeg.R, lpeg.S
local M = {_NAME = 'vbscript'}
-- Whitespace.
local ws = token(l.WHITESPACE, l.space^1)
-- Comments.
local comment = token(l.COMMENT, (P("'") + word_match({'rem'}, nil, true)) * l.nonnewline^0)
-- Strings.
local string = token(l.STRING, l.range('"', true, true))
-- Numbers.
local number = token(l.NUMBER, (l.float + l.integer) * S('LlUuFf')^-2)
-- Keywords.
local keyword = token(l.KEYWORD, word_match({
-- Control.
'If', 'Then', 'Else', 'ElseIf', 'While', 'Wend', 'For', 'To', 'Each',
'In', 'Step', 'Case', 'Select', 'Return', 'Continue', 'Do',
'Until', 'Loop', 'Next', 'With', 'Exit',
-- Operators.
'Mod', 'And', 'Not', 'Or', 'Xor', 'Is',
-- Storage types.
'Call', 'Class', 'Const', 'Dim', 'ReDim', 'Preserve', 'Function', 'Sub',
'Property', 'End', 'Set', 'Let', 'Get', 'New', 'Randomize', 'Option',
'Explicit', 'On', 'Error', 'Execute',
-- Storage modifiers.
'Private', 'Public', 'Default',
-- Constants.
'Empty', 'False', 'Nothing', 'Null', 'True'
}, nil, true))
-- Types.
local type = token(l.TYPE, word_match({
'Boolean', 'Byte', 'Char', 'Date', 'Decimal', 'Double', 'Long', 'Object',
'Short', 'Single', 'String'
}, nil, true))
-- Identifiers.
local identifier = token(l.IDENTIFIER, l.word)
-- Operators.
local operator = token(l.OPERATOR, S('=><+-*^&:.,_()'))
M._rules = {
{'whitespace', ws},
{'keyword', keyword},
{'type', type},
{'comment', comment},
{'identifier', identifier},
{'string', string},
{'number', number},
{'operator', operator},
}
return M
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