105 lines
2.0 KiB
Go
105 lines
2.0 KiB
Go
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// Copyright (c) 2024 Celestino Amoroso (celestino.amoroso@gmail.com).
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// All rights reserved.
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// operator-binary.go
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package expr
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//-------- NOT term
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func newBinNotTerm(tk *Token) (inst *term) {
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return &term{
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tk: *tk,
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children: make([]*term, 0, 1),
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position: posPrefix,
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priority: priNot,
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evalFunc: evalBinaryNot,
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}
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}
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func evalBinaryNot(ctx ExprContext, opTerm *term) (v any, err error) {
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var value any
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if value, err = opTerm.evalPrefix(ctx); err != nil {
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return
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}
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if IsInteger(value) {
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i, _ := value.(int64)
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v = ^i
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} else {
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err = opTerm.errIncompatibleType(value)
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}
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return
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}
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//-------- Binary AND term
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func newBinAndTerm(tk *Token) (inst *term) {
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return &term{
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tk: *tk,
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children: make([]*term, 0, 2),
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position: posInfix,
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priority: priAnd,
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evalFunc: evalBinaryAnd,
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}
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}
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func evalBinaryAnd(ctx ExprContext, self *term) (v any, err error) {
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var leftValue, rightValue any
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var leftInt, rightInt int64
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var lok, rok bool
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if leftValue, rightValue, err = self.evalInfix(ctx); err != nil {
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return
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}
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leftInt, lok = leftValue.(int64)
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rightInt, rok = rightValue.(int64)
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if lok && rok {
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v = leftInt & rightInt
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} else {
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err = self.errIncompatibleTypes(leftValue, rightValue)
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}
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return
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}
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//-------- Binary OR term
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func newBinOrTerm(tk *Token) (inst *term) {
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return &term{
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tk: *tk,
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children: make([]*term, 0, 2),
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position: posInfix,
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priority: priOr,
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evalFunc: evalBinaryOr,
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}
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}
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func evalBinaryOr(ctx ExprContext, self *term) (v any, err error) {
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var leftValue, rightValue any
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var leftInt, rightInt int64
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var lok, rok bool
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if leftValue, rightValue, err = self.evalInfix(ctx); err != nil {
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return
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}
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leftInt, lok = leftValue.(int64)
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rightInt, rok = rightValue.(int64)
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if lok && rok {
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v = leftInt | rightInt
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} else {
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err = self.errIncompatibleTypes(leftValue, rightValue)
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}
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return
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}
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// init
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func init() {
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registerTermConstructor(SymTilde, newBinNotTerm)
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registerTermConstructor(SymAmpersand, newBinAndTerm)
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// registerTermConstructor(SymVertBar, newBinOrTerm)
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}
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