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.
30 lines
757 B
Go
30 lines
757 B
Go
// Copyright (c) 2024-2026 Celestino Amoroso (celestino.amoroso@gmail.com).
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// All rights reserved.
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// term-constructor-registry.go
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package scan
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import "git.portale-stac.it/go-pkg/expr/sym"
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const initialRegistryCapacity = 10
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type termContructor func(tk *Token) *Term
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var constructorRegistry map[sym.Symbol]termContructor = nil
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func RegisterTermConstructor(symmbol sym.Symbol, constructor termContructor) {
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if constructorRegistry == nil {
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constructorRegistry = make(map[sym.Symbol]termContructor, initialRegistryCapacity)
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}
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constructorRegistry[symmbol] = constructor
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}
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func NewTerm(tk *Token) (inst *Term) {
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if constructorRegistry != nil {
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if construct, exists := constructorRegistry[tk.Sym]; exists {
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inst = construct(tk)
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}
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}
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return
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}
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