56 lines
1.7 KiB
Go
56 lines
1.7 KiB
Go
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// Copyright (c) 2020 Alexander Kiryukhin <a.kiryukhin@mail.ru>
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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package executor
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import (
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"errors"
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)
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// ErrInvalidExpression invalid expression error
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// ErrInvalidParenthesis invalid parenthesis error
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var (
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ErrInvalidExpression = errors.New("invalid expression")
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ErrInvalidParenthesis = errors.New("invalid parenthesis")
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)
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type tokenType int
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const (
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literalType tokenType = iota
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variableType
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operatorType
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leftParenthesisType
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rightParenthesisType
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functionType
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funcSep
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eof
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)
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type token struct {
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Type tokenType
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SValue string
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FValue float64
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}
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func newToken(ttype tokenType, SValue string, FValue float64) *token {
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return &token{Type: ttype, SValue: SValue, FValue: FValue}
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}
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