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add rule definition with minimal dsl

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JOLIMAITRE Matthieu 2024-08-07 11:59:58 +02:00
parent fa524a5976
commit 084c5a2574
5 changed files with 48 additions and 15 deletions
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34
lib/lib.ts
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@ -1,6 +1,7 @@
import { Rule } from "./rule.ts";
import { PairElts, StructOfArr } from "./types.ts";
import { Extractor } from "./extractor.ts"
import { split_once } from "./utils.ts";
export function extr<A extends string[]>(...args: A): Extractor<StructOfArr<PairElts<A>, string>> {
const seps = [] as string[];
@ -18,7 +19,7 @@ export function extr<A extends string[]>(...args: A): Extractor<StructOfArr<Pair
return new Extractor(text => rule.get(text))
}
Deno.test("types", async () => {
Deno.test("extr_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"))
@ -26,3 +27,34 @@ Deno.test("types", async () => {
.get("bonjour, le chêne, feuillu");
assertEquals({ vars }, { vars: { "arbre": "le chêne" } })
})
type ArrForDef<D extends string> =
D extends "" ? [] :
D extends `${infer W extends string}{{${infer V extends string}}}${infer R extends string}` ? [W, V, ...ArrForDef<R>] :
D extends `${infer W extends string}` ? [W] :
never;
export function def<D extends string>(def: D): Extractor<StructOfArr<PairElts<ArrForDef<D>>, string>> {
const result = [] as string[];
let rest = def as string;
while (true) {
const [word, var_rest] = split_once(rest, "{{");
if (var_rest === null) break;
const [var_, rest_] = split_once(var_rest, "}}");
if (rest_ === null) throw new Error(`Invalid rule near '${rest}'`);
result.push(word, var_);
rest = rest_;
}
if (rest.length > 0) result.push(rest);
const args = result as ArrForDef<D>;
return extr(...args);
}
Deno.test("def_types", async () => {
const { assertEquals } = await import("https://deno.land/std@0.224.0/assert/assert_equals.ts");
const vars = extr()
.or(def("bonjour, {{animal}}, poilu"))
.or(def("bonjour, {{arbre}}, feuillu"))
.get("bonjour, le chêne, feuillu");
assertEquals({ vars }, { vars: { "arbre": "le chêne" } })
})