typia/src/programmers/internal/feature_object_entries.ts

Superfast runtime validators with only one line

import ts from "typescript";

import { IdentifierFactory } from "../../factories/IdentifierFactory";

import { MetadataObject } from "../../schemas/metadata/MetadataObject";

import { Escaper } from "../../utils/Escaper";

import { FeatureProgrammer } from "../FeatureProgrammer";
import { FunctionImporter } from "../helpers/FunctionImporter";

/**
 * @internal
 */
export const feature_object_entries =
  <Output extends ts.ConciseBody>(
    config: Pick<
      FeatureProgrammer.IConfig<Output>,
      "decoder" | "path" | "trace"
    >,
  ) =>
  (importer: FunctionImporter) =>
  (obj: MetadataObject) =>
  (input: ts.Expression, from: "object" | "top" | "array" = "object") =>
    obj.properties.map((prop) => {
      const sole: string | null = prop.key.getSoleLiteral();
      const propInput =
        sole === null
          ? ts.factory.createIdentifier("value")
          : Escaper.variable(sole)
            ? ts.factory.createPropertyAccessExpression(
                input,
                ts.factory.createIdentifier(sole),
              )
            : ts.factory.createElementAccessExpression(
                input,
                ts.factory.createStringLiteral(sole),
              );

      return {
        input: propInput,
        key: prop.key,
        meta: prop.value,
        expression: config.decoder()(propInput, prop.value, {
          tracable: config.path || config.trace,
          source: "function",
          from,
          postfix: config.trace
            ? sole !== null
              ? IdentifierFactory.postfix(sole)
              : (() => {
                  importer.use("join");
                  return `$join(key)`;
                })()
            : "",
        }),
      };
    });