import { Rule } from "./rule.ts";
import { PairElts, StructOfArr } from "./types.ts";
import { Extractor } from "./extractor.ts"

export function extr<A extends string[]>(...args: A): Extractor<StructOfArr<PairElts<A>, string>> {
    const seps = [] as string[];
    const vars = [] as string[];

    let pair = true;
    for (const arg of args) {
        if (pair) seps.push(arg);
        else vars.push(arg);
        pair = !pair;
    }

    const vars_ = vars as PairElts<A>;
    const rule = new Rule(seps, vars_);
    return new Extractor(text => rule.get(text))
}

Deno.test("types", async () => {
    const { assertEquals } = await import("https://deno.land/std@0.224.0/assert/assert_equals.ts");
    const vars = extr()
        .or(extr("bonjour, ", 'animal', ", poilu"))
        .or(extr("bonjour, ", 'arbre', ", feuillu"))
        .get("bonjour, le chêne, feuillu");
    assertEquals({ vars }, { vars: { "arbre": "le chêne" } })
})