55 lines
980 B
Go
55 lines
980 B
Go
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package main
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import (
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arraystack "github.com/emirpasic/gods/v2/stacks/arraystack"
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)
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func parseBoolExpr(expression string) bool {
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getRune := func(result bool) rune {
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if result {
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return 't'
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}
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return 'f'
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}
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st := arraystack.New[rune]()
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for _, token := range expression {
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if token == ',' || token == '(' {
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// ignore delimiters and opening brackets
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continue
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}
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// Handle closing of the operation
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if token == ')' {
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hasTrue, hasFalse := false, false
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for top, has := st.Peek(); has && top != '!' && top != '&' && top != '|'; top, has = st.Peek() {
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if top == 't' {
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hasTrue = true
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} else if top == 'f' {
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hasFalse = true
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}
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st.Pop()
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}
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// evaluate the operator
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op, _ := st.Pop()
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if op == '!' {
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st.Push(getRune(!hasTrue))
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} else if op == '&' {
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st.Push(getRune(!hasFalse))
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} else {
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st.Push(getRune(hasTrue))
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}
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continue
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}
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st.Push(token)
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}
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result, _ := st.Peek()
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return result == 't'
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}
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