typia/src/factories/internal/metadata/iterate_metadata_template.ts

Superfast runtime validators with only one line

import ts from "typescript";

import { Metadata } from "../../../schemas/metadata/Metadata";
import { MetadataTemplate } from "../../../schemas/metadata/MetadataTemplate";

import { MetadataCollection } from "../../MetadataCollection";
import { MetadataFactory } from "../../MetadataFactory";
import { MetadataHelper } from "./MetadataHelper";
import { explore_metadata } from "./explore_metadata";

export const iterate_metadata_template =
  (checker: ts.TypeChecker) =>
  (options: MetadataFactory.IOptions) =>
  (collection: MetadataCollection) =>
  (errors: MetadataFactory.IError[]) =>
  (
    meta: Metadata,
    type: ts.Type,
    explore: MetadataFactory.IExplore,
  ): boolean => {
    const filter = (flag: ts.TypeFlags) => (type.getFlags() & flag) !== 0;
    if (!filter(ts.TypeFlags.TemplateLiteral)) return false;

    const template: ts.TemplateLiteralType = type as ts.TemplateLiteralType;
    const row: Metadata[] = [];

    template.texts.forEach((text, i) => {
      // TEXT LITERAL TYPE
      if (text !== "") row.push(MetadataHelper.literal_to_metadata(text));

      // BINDED TEMPLATE TYPE
      const binded: ts.Type | undefined = template.types[i];
      if (binded)
        row.push(
          explore_metadata(checker)(options)(collection)(errors)(binded, {
            ...explore,
            escaped: false,
            aliased: false,
          }),
        );
    });
    meta.templates.push(MetadataTemplate.create({ row, tags: undefined }));
    return true;
  };