prepack/lib/intrinsics/ecma262/String.js

Execute a JS bundle, serialize global state and side effects to a snapshot that can be quickly restored.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = _default;

var _index = require("../../values/index.js");

var _index2 = require("../../methods/index.js");

var _singletons = require("../../singletons.js");

var _invariant = _interopRequireDefault(require("../../invariant.js"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * Copyright (c) 2017-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

/*  strict-local */
function _default(realm) {
  // ECMA262 21.1.1
  let func = new _index.NativeFunctionValue(realm, "String", "String", 1, (context, [value], argCount, NewTarget) => {
    let s; // 1. If no arguments were passed to this function invocation, let s be "".

    if (argCount === 0) {
      s = realm.intrinsics.emptyString;
    } else {
      // 2. Else,
      // a. If NewTarget is undefined and Type(value) is Symbol, return SymbolDescriptiveString(value).
      if (!NewTarget && value instanceof _index.SymbolValue) {
        return new _index.StringValue(realm, (0, _index2.SymbolDescriptiveString)(realm, value));
      } // b. Let s be ? ToString(value).


      s = _singletons.To.ToStringValue(realm, value);
    } // 3. If NewTarget is undefined, return s.


    if (!NewTarget) return s; // 4. Return ? StringCreate(s, ? GetPrototypeFromConstructor(NewTarget, "%StringPrototype%")).

    s = s.throwIfNotConcreteString();
    return _singletons.Create.StringCreate(realm, s, (0, _index2.GetPrototypeFromConstructor)(realm, NewTarget, "StringPrototype"));
  }); // ECMA262 21.1.2.1 ( ..._codeUnits_ )

  func.defineNativeMethod("fromCharCode", 1, (context, codeUnits, argCount) => {
    // 1. Let codeUnits be a List containing the arguments passed to this function.
    codeUnits; // 2. Let length be the number of elements in codeUnits.

    let length = argCount; // 3. Let elements be a new empty List.

    let elements = []; // 4. Let nextIndex be 0.

    let nextIndex = 0; // 5. Repeat while nextIndex < length

    while (nextIndex < length) {
      // a. Let next be codeUnits[nextIndex].
      let next = codeUnits[nextIndex]; // b. Let nextCU be ? ToUint16(next).

      let nextCU = _singletons.To.ToUint16(realm, next); // c. Append nextCU to the end of elements.


      elements.push(nextCU); // d. Let nextIndex be nextIndex + 1.

      nextIndex++;
    } // 6. Return the String value whose elements are, in order, the elements in the List elements. If length
    //    is 0, the empty string is returned.


    return new _index.StringValue(realm, String.fromCharCode.apply(null, elements));
  }); // ECMA262 21.1.2.2 ( ..._codePoints_ )

  if (!realm.isCompatibleWith(realm.MOBILE_JSC_VERSION) && !realm.isCompatibleWith("mobile")) func.defineNativeMethod("fromCodePoint", 1, (context, codePoints, argCount) => {
    // 1. Let codePoints be a List containing the arguments passed to this function.
    codePoints; // 2. Let length be the number of elements in codePoints.

    let length = argCount; // 3. Let elements be a new empty List.

    let elements = []; // 4. Let nextIndex be 0.

    let nextIndex = 0; // 5. Repeat while nextIndex < length

    while (nextIndex < length) {
      // a. Let next be codePoints[nextIndex].
      let next = codePoints[nextIndex]; // b. Let nextCP be ? ToNumber(next).

      let nextCP = _singletons.To.ToNumber(realm, next); // c. If SameValue(nextCP, ToInteger(nextCP)) is false, throw a RangeError exception.


      if (nextCP !== _singletons.To.ToInteger(realm, nextCP)) {
        throw realm.createErrorThrowCompletion(realm.intrinsics.RangeError, "SameValue(nextCP, To.ToInteger(nextCP)) is false");
      } // d. If nextCP < 0 or nextCP > 0x10FFFF, throw a RangeError exception.


      if (nextCP < 0 || nextCP > 0x10ffff) {
        throw realm.createErrorThrowCompletion(realm.intrinsics.RangeError, "SameValue(nextCP, To.ToInteger(nextCP)) is false");
      } // e. Append the elements of the UTF16Encoding of nextCP to the end of elements.


      elements.push(String.fromCodePoint(nextCP)); // f. Let nextIndex be nextIndex + 1.

      nextIndex++;
    } // 6. Return the String value whose elements are, in order, the elements in the List elements. If length
    //    is 0, the empty string is returned.


    return new _index.StringValue(realm, elements.join(""));
  }); // ECMA262 21.1.2.4

  if (!realm.isCompatibleWith(realm.MOBILE_JSC_VERSION) && !realm.isCompatibleWith("mobile")) func.defineNativeMethod("raw", 1, (context, [template, ..._substitutions], argCount) => {
    let substitutions = _substitutions; // 1. Let substitutions be a List consisting of all of the arguments passed to this function, starting with the second argument. If fewer than two arguments were passed, the List is empty.

    substitutions = argCount < 2 ? [] : substitutions; // 2. Let numberOfSubstitutions be the number of elements in substitutions.

    let numberOfSubstitutions = substitutions.length; // 3. Let cooked be ? ToObject(template).

    let cooked = _singletons.To.ToObject(realm, template); // 4. Let raw be ? ToObject(? Get(cooked, "raw")).


    let raw = _singletons.To.ToObject(realm, (0, _index2.Get)(realm, cooked, "raw")); // 5. Let literalSegments be ? ToLength(? Get(raw, "length")).


    let literalSegments = _singletons.To.ToLength(realm, (0, _index2.Get)(realm, raw, "length")); // 6. If literalSegments ≤ 0, return the empty string.


    if (literalSegments <= 0) return realm.intrinsics.emptyString; // 7. Let stringElements be a new empty List.

    let stringElements = ""; // 8. Let nextIndex be 0.

    let nextIndex = 0; // 9. Repeat

    while (true) {
      // a. Let nextKey be ! ToString(nextIndex).
      let nextKey = _singletons.To.ToString(realm, new _index.NumberValue(realm, nextIndex)); // b. Let nextSeg be ? ToString(? Get(raw, nextKey)).


      let nextSeg = _singletons.To.ToStringPartial(realm, (0, _index2.Get)(realm, raw, nextKey)); // c. Append in order the code unit elements of nextSeg to the end of stringElements.


      stringElements = stringElements + nextSeg; // d. If nextIndex + 1 = literalSegments, then

      if (nextIndex + 1 === literalSegments) {
        // i. Return the String value whose code units are, in order, the elements in the List stringElements. If stringElements has no elements, the empty string is returned.
        return new _index.StringValue(realm, stringElements);
      }

      let next; // e. If nextIndex < numberOfSubstitutions, let next be substitutions[nextIndex].

      if (nextIndex < numberOfSubstitutions) next = substitutions[nextIndex];else {
        // f. Else, let next be the empty String.
        next = realm.intrinsics.emptyString;
      } // g. Let nextSub be ? ToString(next).

      let nextSub = _singletons.To.ToStringPartial(realm, next); // h. Append in order the code unit elements of nextSub to the end of stringElements.


      stringElements = stringElements + nextSub; // i. Let nextIndex be nextIndex + 1.

      nextIndex = nextIndex + 1;
    }

    (0, _invariant.default)(false);
  });
  return func;
}
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