@babel/types/lib/clone/cloneNode.js

"use strict";

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

var _definitions = require("../definitions");

var _generated = require("../validators/generated");

const has = Function.call.bind(Object.prototype.hasOwnProperty);

function cloneIfNode(obj, deep, withoutLoc) {
  if (obj && typeof obj.type === "string") {
    return cloneNode(obj, deep, withoutLoc);
  }

  return obj;
}

function cloneIfNodeOrArray(obj, deep, withoutLoc) {
  if (Array.isArray(obj)) {
    return obj.map(node => cloneIfNode(node, deep, withoutLoc));
  }

  return cloneIfNode(obj, deep, withoutLoc);
}

function cloneNode(node, deep = true, withoutLoc = false) {
  if (!node) return node;
  const {
    type
  } = node;
  const newNode = {
    type: node.type
  };

  if ((0, _generated.isIdentifier)(node)) {
    newNode.name = node.name;

    if (has(node, "optional") && typeof node.optional === "boolean") {
      newNode.optional = node.optional;
    }

    if (has(node, "typeAnnotation")) {
      newNode.typeAnnotation = deep ? cloneIfNodeOrArray(node.typeAnnotation, true, withoutLoc) : node.typeAnnotation;
    }
  } else if (!has(_definitions.NODE_FIELDS, type)) {
    throw new Error(`Unknown node type: "${type}"`);
  } else {
    for (const field of Object.keys(_definitions.NODE_FIELDS[type])) {
      if (has(node, field)) {
        if (deep) {
          newNode[field] = (0, _generated.isFile)(node) && field === "comments" ? maybeCloneComments(node.comments, deep, withoutLoc) : cloneIfNodeOrArray(node[field], true, withoutLoc);
        } else {
          newNode[field] = node[field];
        }
      }
    }
  }

  if (has(node, "loc")) {
    if (withoutLoc) {
      newNode.loc = null;
    } else {
      newNode.loc = node.loc;
    }
  }

  if (has(node, "leadingComments")) {
    newNode.leadingComments = maybeCloneComments(node.leadingComments, deep, withoutLoc);
  }

  if (has(node, "innerComments")) {
    newNode.innerComments = maybeCloneComments(node.innerComments, deep, withoutLoc);
  }

  if (has(node, "trailingComments")) {
    newNode.trailingComments = maybeCloneComments(node.trailingComments, deep, withoutLoc);
  }

  if (has(node, "extra")) {
    newNode.extra = Object.assign({}, node.extra);
  }

  return newNode;
}

function maybeCloneComments(comments, deep, withoutLoc) {
  if (!comments || !deep) {
    return comments;
  }

  return comments.map(({
    type,
    value,
    loc
  }) => {
    if (withoutLoc) {
      return {
        type,
        value,
        loc: null
      };
    }

    return {
      type,
      value,
      loc
    };
  });
}