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ScopeBindings.ts
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56 lines (41 loc) · 1.33 KB
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import { OrderedSet } from './OrderedSet';
export interface IScopeBindings {
readonly parent: IScopeBindings | null;
hasBinding: (varName: string) => boolean;
hasOwnBinding: (varName: string) => boolean;
addBinding: (varName: string) => void;
removeBinding: (varName: string) => void;
getAllBindings: () => string[];
getAllOwnedBindings: () => string[];
}
export class ScopeBindings implements IScopeBindings {
readonly parent: IScopeBindings | null;
private _bindings = new OrderedSet<string>();
constructor(p: IScopeBindings | null = null) {
this.parent = p;
}
hasBinding(varName: string): boolean {
return this._bindings.has(varName) || !!this.parent?.hasBinding(varName);
}
hasOwnBinding(varName: string): boolean {
return this._bindings.has(varName);
}
addBinding(varName: string): void {
this._bindings.add(varName);
}
removeBinding(varName: string): void {
this._bindings.delete(varName);
}
getAllBindings(): string[] {
const allBindings = new OrderedSet(this._bindings.toArray());
for (let { parent } = this; parent; parent = parent?.parent) {
parent.getAllOwnedBindings().forEach((varName) => {
allBindings.add(varName);
});
}
return allBindings.toArray();
}
getAllOwnedBindings(): string[] {
return this._bindings.toArray();
}
}