mine/node_modules/@babel/plugin-transform-for-of/lib/index.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
var _helperPluginUtils = require("@babel/helper-plugin-utils");
var _core = require("@babel/core");
var _noHelperImplementation = require("./no-helper-implementation");
function buildLoopBody(path, declar, newBody) {
  let block;
  const bodyPath = path.get("body");
  const body = newBody != null ? newBody : bodyPath.node;
  if (_core.types.isBlockStatement(body) && Object.keys(path.getBindingIdentifiers()).some(id => bodyPath.scope.hasOwnBinding(id))) {
    block = _core.types.blockStatement([declar, body]);
  } else {
    block = _core.types.toBlock(body);
    block.body.unshift(declar);
  }
  return block;
}
var _default = (0, _helperPluginUtils.declare)((api, options) => {
  var _options$assumeArray, _options$allowArrayLi, _api$assumption;
  api.assertVersion(7);
  {
    const {
      assumeArray,
      allowArrayLike,
      loose
    } = options;
    if (loose === true && assumeArray === true) {
      throw new Error(`The loose and assumeArray options cannot be used together in @babel/plugin-transform-for-of`);
    }
    if (assumeArray === true && allowArrayLike === true) {
      throw new Error(`The assumeArray and allowArrayLike options cannot be used together in @babel/plugin-transform-for-of`);
    }
    {
      if (allowArrayLike && /^7\.\d\./.test(api.version)) {
        throw new Error(`The allowArrayLike is only supported when using @babel/core@^7.10.0`);
      }
    }
  }
  const iterableIsArray = (_options$assumeArray = options.assumeArray) != null ? _options$assumeArray : !options.loose && api.assumption("iterableIsArray");
  const arrayLikeIsIterable = (_options$allowArrayLi = options.allowArrayLike) != null ? _options$allowArrayLi : api.assumption("arrayLikeIsIterable");
  const skipIteratorClosing = (_api$assumption = api.assumption("skipForOfIteratorClosing")) != null ? _api$assumption : options.loose;
  if (iterableIsArray && arrayLikeIsIterable) {
    throw new Error(`The "iterableIsArray" and "arrayLikeIsIterable" assumptions are not compatible.`);
  }
  if (iterableIsArray) {
    return {
      name: "transform-for-of",
      visitor: {
        ForOfStatement(path) {
          const {
            scope
          } = path;
          const {
            left,
            right,
            await: isAwait
          } = path.node;
          if (isAwait) {
            return;
          }
          const i = scope.generateUidIdentifier("i");
          let array = scope.maybeGenerateMemoised(right, true);
          const inits = [_core.types.variableDeclarator(i, _core.types.numericLiteral(0))];
          if (array) {
            inits.push(_core.types.variableDeclarator(array, right));
          } else {
            array = right;
          }
          const item = _core.types.memberExpression(_core.types.cloneNode(array), _core.types.cloneNode(i), true);
          let assignment;
          if (_core.types.isVariableDeclaration(left)) {
            assignment = left;
            assignment.declarations[0].init = item;
          } else {
            assignment = _core.types.expressionStatement(_core.types.assignmentExpression("=", left, item));
          }
          path.replaceWith(_core.types.forStatement(_core.types.variableDeclaration("let", inits), _core.types.binaryExpression("<", _core.types.cloneNode(i), _core.types.memberExpression(_core.types.cloneNode(array), _core.types.identifier("length"))), _core.types.updateExpression("++", _core.types.cloneNode(i)), buildLoopBody(path, assignment)));
        }
      }
    };
  }
  const buildForOfArray = (0, _core.template)`
    for (var KEY = 0, NAME = ARR; KEY < NAME.length; KEY++) BODY;
  `;
  const buildForOfNoIteratorClosing = _core.template.statements`
    for (var ITERATOR_HELPER = CREATE_ITERATOR_HELPER(OBJECT, ARRAY_LIKE_IS_ITERABLE), STEP_KEY;
        !(STEP_KEY = ITERATOR_HELPER()).done;) BODY;
  `;
  const buildForOf = _core.template.statements`
    var ITERATOR_HELPER = CREATE_ITERATOR_HELPER(OBJECT, ARRAY_LIKE_IS_ITERABLE), STEP_KEY;
    try {
      for (ITERATOR_HELPER.s(); !(STEP_KEY = ITERATOR_HELPER.n()).done;) BODY;
    } catch (err) {
      ITERATOR_HELPER.e(err);
    } finally {
      ITERATOR_HELPER.f();
    }
  `;
  const builder = skipIteratorClosing ? {
    build: buildForOfNoIteratorClosing,
    helper: "createForOfIteratorHelperLoose",
    getContainer: nodes => nodes
  } : {
    build: buildForOf,
    helper: "createForOfIteratorHelper",
    getContainer: nodes => nodes[1].block.body
  };
  function _ForOfStatementArray(path) {
    const {
      node,
      scope
    } = path;
    const right = scope.generateUidIdentifierBasedOnNode(node.right, "arr");
    const iterationKey = scope.generateUidIdentifier("i");
    const loop = buildForOfArray({
      BODY: node.body,
      KEY: iterationKey,
      NAME: right,
      ARR: node.right
    });
    _core.types.inherits(loop, node);
    const iterationValue = _core.types.memberExpression(_core.types.cloneNode(right), _core.types.cloneNode(iterationKey), true);
    let declar;
    const left = node.left;
    if (_core.types.isVariableDeclaration(left)) {
      left.declarations[0].init = iterationValue;
      declar = left;
    } else {
      declar = _core.types.expressionStatement(_core.types.assignmentExpression("=", left, iterationValue));
    }
    loop.body = buildLoopBody(path, declar, loop.body);
    return loop;
  }
  return {
    name: "transform-for-of",
    visitor: {
      ForOfStatement(path, state) {
        const right = path.get("right");
        if (right.isArrayExpression() || right.isGenericType("Array") || _core.types.isArrayTypeAnnotation(right.getTypeAnnotation())) {
          path.replaceWith(_ForOfStatementArray(path));
          return;
        }
        {
          if (!state.availableHelper(builder.helper)) {
            (0, _noHelperImplementation.default)(skipIteratorClosing, path, state);
            return;
          }
        }
        const {
          node,
          parent,
          scope
        } = path;
        const left = node.left;
        let declar;
        const stepKey = scope.generateUid("step");
        const stepValue = _core.types.memberExpression(_core.types.identifier(stepKey), _core.types.identifier("value"));
        if (_core.types.isVariableDeclaration(left)) {
          declar = _core.types.variableDeclaration(left.kind, [_core.types.variableDeclarator(left.declarations[0].id, stepValue)]);
        } else {
          declar = _core.types.expressionStatement(_core.types.assignmentExpression("=", left, stepValue));
        }
        const nodes = builder.build({
          CREATE_ITERATOR_HELPER: state.addHelper(builder.helper),
          ITERATOR_HELPER: scope.generateUidIdentifier("iterator"),
          ARRAY_LIKE_IS_ITERABLE: arrayLikeIsIterable ? _core.types.booleanLiteral(true) : null,
          STEP_KEY: _core.types.identifier(stepKey),
          OBJECT: node.right,
          BODY: buildLoopBody(path, declar)
        });
        const container = builder.getContainer(nodes);
        _core.types.inherits(container[0], node);
        _core.types.inherits(container[0].body, node.body);
        if (_core.types.isLabeledStatement(parent)) {
          container[0] = _core.types.labeledStatement(parent.label, container[0]);
          path.parentPath.replaceWithMultiple(nodes);
          path.skip();
        } else {
          path.replaceWithMultiple(nodes);
        }
      }
    }
  };
});
exports.default = _default;

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