-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
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-- VisualBasic LPeg lexer.
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local lexer = require('lexer')
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local token, word_match = lexer.token, lexer.word_match
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local P, R, S = lpeg.P, lpeg.R, lpeg.S
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local lex = lexer.new('vb')
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-- Whitespace.
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lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
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-- Keywords.
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lex:add_rule('keyword', token(lexer.KEYWORD, word_match([[
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-- Control.
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If Then Else ElseIf While Wend For To Each In Step Case Select Return Continue
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Do Until Loop Next With Exit
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-- Operators.
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Mod And Not Or Xor Is
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-- Storage types.
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Call Class Const Dim ReDim Preserve Function Sub Property End Set Let Get New
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Randomize Option Explicit On Error Execute
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-- Storage modifiers.
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Private Public Default
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-- Constants.
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Empty False Nothing Null True
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]], true)))
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-- Types.
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lex:add_rule('type', token(lexer.TYPE, word_match([[
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Boolean Byte Char Date Decimal Double Long Object Short Single String
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]], true)))
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-- Comments.
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lex:add_rule('comment', token(lexer.COMMENT,
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(P("'") + word_match([[rem]], true)) *
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lexer.nonnewline^0))
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-- Identifiers.
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lex:add_rule('identifier', token(lexer.IDENTIFIER, lexer.word))
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-- Strings.
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lex:add_rule('string', token(lexer.STRING,
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lexer.delimited_range('"', true, true)))
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-- Numbers.
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lex:add_rule('number', token(lexer.NUMBER, (lexer.float + lexer.integer) *
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S('LlUuFf')^-2))
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-- Operators.
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lex:add_rule('operator', token(lexer.OPERATOR, S('=><+-*^&:.,_()')))
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return lex
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