36 lines
697 B
TypeScript
36 lines
697 B
TypeScript
import type { Value } from "./value"
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export class Scope {
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locals = new Map<string, Value>()
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parent?: Scope
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constructor(parent?: Scope) {
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this.parent = parent
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}
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get(name: string): Value | undefined {
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if (this.locals.has(name))
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return this.locals.get(name)!
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if (this.parent)
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return this.parent.get(name)
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return undefined
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}
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set(name: string, value: Value) {
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if (this.locals.has(name))
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this.locals.set(name, value)
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else if (this.parent?.has(name))
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this.parent.set(name, value)
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else
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this.locals.set(name, value)
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}
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has(name: string): boolean {
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return this.locals.has(name) || this.parent?.has(name) || false
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}
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}
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