calcium-lang/dist/command/for.js

Calcium language interpreter

import { Block, Kind, Result } from "../runtime/block";
import { evaluate } from "../util";
import { default as Sym } from "../symbol";
/**
 * for loop
 */
export default class For {
    constructor(variable, iterable) {
        this.variable = variable;
        this.iterable = iterable;
    }
    execute(env) {
        const iterator = Reflect.get(evaluate(this.iterable, env), Sym.iter);
        const block = new Block(Kind.For, env.address, (env) => {
            const nextValue = Reflect.get(iterator, Sym.next);
            if (nextValue === null) {
                return false;
            }
            this.variable.assign(nextValue, env);
            return true;
        }, (env) => {
            block.willEnter(env);
            return Result.Jumpped;
        });
        block.willEnter(env);
    }
}
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