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Viewing / Editing File: traverse.js

"use strict";

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

var _nodePath = require("./node-path");

var _nodes = require("./nodes");

// recursively walks the AST starting at the given node. The callback is invoked for
// and object that has a 'type' property.
function walk(context, callback) {
  var stop = false;

function innerWalk(context, callback) {
    if (stop) {
      return;
    }

var node = context.node;

if (node === undefined) {
      console.warn("traversing with an empty context");
      return;
    }

if (node._deleted === true) {
      return;
    }

var path = (0, _nodePath.createPath)(context);
    callback(node.type, path);

if (path.shouldStop) {
      stop = true;
      return;
    }

Object.keys(node).forEach(function (prop) {
      var value = node[prop];

if (value === null || value === undefined) {
        return;
      }

innerWalk(context, callback);
}

var noop = function noop() {};

var unionTypes = _nodes.unionTypesMap[type];

if (!unionTypes) {
      throw new Error("Unexpected node type ".concat(type));
    }

unionTypes.forEach(function (unionType) {
      if (typeof visitors[unionType] === "function") {
        before(unionType, path);
        visitors[unionType](path);
        after(unionType, path);
      }
    });
  });
}

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