flow like the river

VISUALIZACION/node_modules/babel-helper-remap-async-to-generator/lib/for-await.js

@@ -0,0 +1,89 @@
+"use strict";
+
+exports.__esModule = true;
+
+exports.default = function (path, helpers) {
+  var node = path.node,
+      scope = path.scope,
+      parent = path.parent;
+
+
+  var stepKey = scope.generateUidIdentifier("step");
+  var stepValue = scope.generateUidIdentifier("value");
+  var left = node.left;
+  var declar = void 0;
+
+  if (t.isIdentifier(left) || t.isPattern(left) || t.isMemberExpression(left)) {
+    declar = t.expressionStatement(t.assignmentExpression("=", left, stepValue));
+  } else if (t.isVariableDeclaration(left)) {
+    declar = t.variableDeclaration(left.kind, [t.variableDeclarator(left.declarations[0].id, stepValue)]);
+  }
+
+  var template = buildForAwait();
+
+  (0, _babelTraverse2.default)(template, forAwaitVisitor, null, {
+    ITERATOR_HAD_ERROR_KEY: scope.generateUidIdentifier("didIteratorError"),
+    ITERATOR_COMPLETION: scope.generateUidIdentifier("iteratorNormalCompletion"),
+    ITERATOR_ERROR_KEY: scope.generateUidIdentifier("iteratorError"),
+    ITERATOR_KEY: scope.generateUidIdentifier("iterator"),
+    GET_ITERATOR: helpers.getAsyncIterator,
+    OBJECT: node.right,
+    STEP_VALUE: stepValue,
+    STEP_KEY: stepKey,
+    AWAIT: helpers.wrapAwait
+  });
+
+  template = template.body.body;
+
+  var isLabeledParent = t.isLabeledStatement(parent);
+  var tryBody = template[3].block.body;
+  var loop = tryBody[0];
+
+  if (isLabeledParent) {
+    tryBody[0] = t.labeledStatement(parent.label, loop);
+  }
+
+  return {
+    replaceParent: isLabeledParent,
+    node: template,
+    declar: declar,
+    loop: loop
+  };
+};
+
+var _babelTypes = require("babel-types");
+
+var t = _interopRequireWildcard(_babelTypes);
+
+var _babelTemplate = require("babel-template");
+
+var _babelTemplate2 = _interopRequireDefault(_babelTemplate);
+
+var _babelTraverse = require("babel-traverse");
+
+var _babelTraverse2 = _interopRequireDefault(_babelTraverse);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
+
+var buildForAwait = (0, _babelTemplate2.default)("\n  function* wrapper() {\n    var ITERATOR_COMPLETION = true;\n    var ITERATOR_HAD_ERROR_KEY = false;\n    var ITERATOR_ERROR_KEY = undefined;\n    try {\n      for (\n        var ITERATOR_KEY = GET_ITERATOR(OBJECT), STEP_KEY, STEP_VALUE;\n        (\n          STEP_KEY = yield AWAIT(ITERATOR_KEY.next()),\n          ITERATOR_COMPLETION = STEP_KEY.done,\n          STEP_VALUE = yield AWAIT(STEP_KEY.value),\n          !ITERATOR_COMPLETION\n        );\n        ITERATOR_COMPLETION = true) {\n      }\n    } catch (err) {\n      ITERATOR_HAD_ERROR_KEY = true;\n      ITERATOR_ERROR_KEY = err;\n    } finally {\n      try {\n        if (!ITERATOR_COMPLETION && ITERATOR_KEY.return) {\n          yield AWAIT(ITERATOR_KEY.return());\n        }\n      } finally {\n        if (ITERATOR_HAD_ERROR_KEY) {\n          throw ITERATOR_ERROR_KEY;\n        }\n      }\n    }\n  }\n");
+
+var forAwaitVisitor = {
+  noScope: true,
+
+  Identifier: function Identifier(path, replacements) {
+    if (path.node.name in replacements) {
+      path.replaceInline(replacements[path.node.name]);
+    }
+  },
+  CallExpression: function CallExpression(path, replacements) {
+    var callee = path.node.callee;
+
+    if (t.isIdentifier(callee) && callee.name === "AWAIT" && !replacements.AWAIT) {
+      path.replaceWith(path.node.arguments[0]);
+    }
+  }
+};
+
+module.exports = exports["default"];