calcium-lang/dist/runtime/slice.js

Calcium language interpreter

import { None } from "../factory";
import { SliceNotSupported } from "../error";
export default class Slice {
    constructor(list) {
        this.list = list;
    }
    get(lower, upper) {
        const [start, end] = this.getRange(lower, upper);
        return this.list.slice(start, end);
    }
    set(lower, upper, value) {
        const [start, count] = this.calcStartAndCount(lower, upper);
        if (typeof this.list !== "string") {
            this.list.splice(start, count, ...value);
        }
        else {
            throw new SliceNotSupported();
        }
    }
    calcStartAndCount(lower, upper) {
        let [l, u] = this.getRange(lower, upper);
        if (l < 0) {
            l += this.list.length;
            if (l < 0) {
                l = 0;
            }
        }
        if (u < 0) {
            u += this.list.length;
            if (u < 0) {
                u = 0;
            }
        }
        let count = u - l;
        if (count < 0) {
            count = 0;
        }
        return [l, count];
    }
    getRange(lower, upper) {
        const l = lower === None ? 0 : +lower;
        const u = upper === None ? this.list.length : +upper;
        return [l, u];
    }
}
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