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30 lines
524 B
30 lines
524 B
3 years ago
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export class Env {
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constructor(outer, data = {}) {
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this.outer = outer;
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this.data = data;
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}
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static set(env, key, val) {
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if (env.data[key] ||
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env.outer === null) {
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return env.data[key] = val;
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}
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return Env.set(env.outer, key, val);
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}
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static find(env, key) {
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return env.data[key] ||
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(env.outer && Env.find(env.outer, key));
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}
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static get(env, key) {
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const o = Env.find(env, key);
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if (o === null) {
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throw new Error(`Not found: ${key}`);
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}
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return o;
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}
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}
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