calcium-lang/dist/expression/comma.js

Calcium language interpreter

import { CannotUnpackValue } from "../error";
import { default as Sym } from "../symbol";
import { retrieveValue } from "../util";
/**
 * multiple values assignment or unpacking
 */
export default class Comma {
    constructor(refs) {
        this.refs = refs;
    }
    assign(rhs, env) {
        const kind = Reflect.get(rhs, Sym.class);
        if (kind !== "list" && kind !== "tuple") {
            throw new CannotUnpackValue();
        }
        const container = retrieveValue(rhs, env);
        for (let i = 0; i < this.refs.length; ++i) {
            this.refs[i].assign(container[i], env);
        }
    }
    get [Sym.description]() {
        return `${this.refs
            .map((r) => Reflect.get(r, Sym.description))
            .join(", ")}`;
    }
}
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