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

Superfast runtime validators with only one line

import ts from "typescript";

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

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

import { TypeFactory } from "../../TypeFactory";

export const iterate_metadata_native =
  (checker: ts.TypeChecker) =>
  (meta: Metadata, type: ts.Type): boolean => {
    const validator = validate(checker)(type);
    const name: string = TypeFactory.getFullName(checker)(
      type,
      type.getSymbol(),
    );

    const simple = SIMPLES.get(name);
    if (simple && validator(simple)) {
      ArrayUtil.set(meta.natives, name, (str) => str);
      return true;
    }

    for (const generic of GENERICS)
      if (
        name.substring(0, generic.name.length) === generic.name &&
        validator(generic)
      ) {
        ArrayUtil.set(meta.natives, generic.name ?? name, (str) => str);
        return true;
      }
    return false;
  };

const validate =
  (checker: ts.TypeChecker) => (type: ts.Type) => (info: IClassInfo) =>
    (info.methods ?? []).every((method) => {
      const returnType = TypeFactory.getReturnType(checker)(type)(method.name);
      return (
        returnType !== null &&
        checker.typeToString(returnType) === method.return
      );
    }) &&
    (info.properties ?? []).every((property) => {
      const prop = checker.getPropertyOfType(type, property.name);
      const propType = prop?.valueDeclaration
        ? checker.getTypeAtLocation(prop?.valueDeclaration)
        : undefined;
      return (
        propType !== undefined &&
        checker.typeToString(propType) === property.type
      );
    });

const getBinaryProps = (className: string): IClassInfo => ({
  name: className,
  methods: [
    ...["indexOf", "lastIndexOf"].map((name) => ({
      name,
      return: "number",
    })),
    ...["some", "every"].map((name) => ({
      name,
      return: "boolean",
    })),
    ...["join", "toLocaleString"].map((name) => ({
      name,
      return: "string",
    })),
    ...["reverse", "slice", "subarray"].map((name) => ({
      name,
      return: className,
    })),
  ],
  properties: ["BYTES_PER_ELEMENT", "length", "byteLength", "byteOffset"].map(
    (name) => ({
      name,
      type: "number",
    }),
  ),
});
const SIMPLES: Map<string, IClassInfo> = new Map([
  [
    "Date",
    {
      methods: ["getTime", "getFullYear", "getMonth", "getMinutes"].map(
        (name) => ({
          name,
          return: "number",
        }),
      ),
    },
  ],
  [
    "Boolean",
    {
      methods: [
        {
          name: "valueOf",
          return: "boolean",
        },
      ],
    },
  ],
  [
    "Number",
    {
      methods: [
        ...["toFixed", "toExponential", "toPrecision"].map((name) => ({
          name,
          return: "string",
        })),
        { name: "valueOf", return: "number" },
      ],
    },
  ],
  [
    "String",
    {
      methods: [
        "charAt",
        "concat",
        "valueOf",
        "trim",
        "replace",
        "substring",
      ].map((name) => ({ name, return: "string" })),
    },
  ],
  ...[
    "Uint8Array",
    "Uint8ClampedArray",
    "Uint16Array",
    "Uint32Array",
    "BigUint64Array",
    "Int8Array",
    "Int16Array",
    "Int32Array",
    "BigInt64Array",
    "Float32Array",
    "Float64Array",
  ].map((name) => [name, getBinaryProps(name)] as const),
  ...["ArrayBuffer", "SharedArrayBuffer"].map((className) => {
    const info: IClassInfo = {
      methods: [{ name: "slice", return: className }],
      properties: [{ name: "byteLength", type: "number" }],
    };
    return [className, info] as const;
  }),
  ...["Blob", "File"].map(
    (className) =>
      [
        className,
        {
          methods: [
            { name: "arrayBuffer", return: "Promise<ArrayBuffer>" },
            { name: "slice", return: "Blob" },
            { name: "text", return: "Promise<string>" },
          ],
          properties: [
            { name: "size", type: "number" },
            { name: "type", type: "string" },
          ],
        },
      ] satisfies [string, IClassInfo],
  ),
  [
    "DataView",
    {
      methods: [
        "getFloat32",
        "getFloat64",
        "getInt8",
        "getInt16",
        "getInt32",
        "getUint8",
        "getUint16",
        "getUint32",
      ].map((name) => ({
        name,
        return: "number",
      })),
    },
  ],
  [
    "RegExp",
    {
      methods: [
        {
          name: "test",
          return: "boolean",
        },
      ],
    },
  ],
]);
const GENERICS: Array<IClassInfo & { name: string }> = [
  "WeakMap",
  "WeakSet",
].map((name) => ({
  name,
  methods: ["has", "delete"].map((name) => ({
    name,
    return: "boolean",
  })),
}));

interface IClassInfo {
  name?: string;
  methods?: IMethod[];
  properties?: IProperty[];
}
interface IProperty {
  name: string;
  type: string;
}
interface IMethod {
  name: string;
  return: string;
}