import { Plugin } from "..";

export default class CompileTimeJS extends Plugin {
    name = "compile-time-js";
    rewriteTriggers = ["html", "*"]
    longLasting = false;
    build = undefined;

    async rewriteFile(file: string, filePath: string): Promise<string> {
        let input = file;
        const regex = /\{\&([\s\S]*?)\&\}/gms;

        let m;
        while ((m = regex.exec(input)) !== null) {
            if (m.index === regex.lastIndex) {
                regex.lastIndex++;
            }

            const before = input.slice(0, m.index);
            const expr = m[1];
            const after = input.slice(m.index + m[0].length);

            const result = eval(expr); // You can replace this with Function() for sandboxing
            input = before + result + after;

            // Reset regex lastIndex since we changed the string
            regex.lastIndex = 0;
        }

        return input;
    }
}