camoroso
8e596d5979
1. moved scan/symbol.go to new package sym and adapted all files that reference Symbol type and its values. 2. new type interval defined by begin, end and step values. 3. replaced operator-range.go with operator-interval.go. 4. replaced range operator begin:end with begin..end..step. 5. new implementation of sub-collection extraction based on new interval literal.
34 lines
693 B
Go
34 lines
693 B
Go
// Copyright (c) 2024-2026 Celestino Amoroso (celestino.amoroso@gmail.com).
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// All rights reserved.
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// operator-but.go
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package expr
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import (
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"git.portale-stac.it/go-pkg/expr/kern"
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"git.portale-stac.it/go-pkg/expr/scan"
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"git.portale-stac.it/go-pkg/expr/sym"
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)
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//-------- but term
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func newButTerm(tk *scan.Token) (inst *scan.Term) {
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return &scan.Term{
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Tk: *tk,
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Children: make([]*scan.Term, 0, 2),
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Position: scan.PosInfix,
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Priority: scan.PriBut,
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EvalFunc: evalBut,
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}
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}
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func evalBut(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
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_, v, err = opTerm.EvalInfix(ctx)
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return
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}
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// init
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func init() {
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scan.RegisterTermConstructor(sym.SymKwBut, newButTerm)
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}
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