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node_modules/graphql/validation/rules/PossibleFragmentSpreads.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.typeIncompatibleSpreadMessage = typeIncompatibleSpreadMessage;
+exports.typeIncompatibleAnonSpreadMessage = typeIncompatibleAnonSpreadMessage;
+exports.PossibleFragmentSpreads = PossibleFragmentSpreads;
+
+var _inspect = _interopRequireDefault(require("../../jsutils/inspect"));
+
+var _GraphQLError = require("../../error/GraphQLError");
+
+var _definition = require("../../type/definition");
+
+var _typeFromAST = require("../../utilities/typeFromAST");
+
+var _typeComparators = require("../../utilities/typeComparators");
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function typeIncompatibleSpreadMessage(fragName, parentType, fragType) {
+  return "Fragment \"".concat(fragName, "\" cannot be spread here as objects of type \"").concat(parentType, "\" can never be of type \"").concat(fragType, "\".");
+}
+
+function typeIncompatibleAnonSpreadMessage(parentType, fragType) {
+  return "Fragment cannot be spread here as objects of type \"".concat(parentType, "\" can never be of type \"").concat(fragType, "\".");
+}
+/**
+ * Possible fragment spread
+ *
+ * A fragment spread is only valid if the type condition could ever possibly
+ * be true: if there is a non-empty intersection of the possible parent types,
+ * and possible types which pass the type condition.
+ */
+
+
+function PossibleFragmentSpreads(context) {
+  return {
+    InlineFragment: function InlineFragment(node) {
+      var fragType = context.getType();
+      var parentType = context.getParentType();
+
+      if ((0, _definition.isCompositeType)(fragType) && (0, _definition.isCompositeType)(parentType) && !(0, _typeComparators.doTypesOverlap)(context.getSchema(), fragType, parentType)) {
+        context.reportError(new _GraphQLError.GraphQLError(typeIncompatibleAnonSpreadMessage((0, _inspect.default)(parentType), (0, _inspect.default)(fragType)), node));
+      }
+    },
+    FragmentSpread: function FragmentSpread(node) {
+      var fragName = node.name.value;
+      var fragType = getFragmentType(context, fragName);
+      var parentType = context.getParentType();
+
+      if (fragType && parentType && !(0, _typeComparators.doTypesOverlap)(context.getSchema(), fragType, parentType)) {
+        context.reportError(new _GraphQLError.GraphQLError(typeIncompatibleSpreadMessage(fragName, (0, _inspect.default)(parentType), (0, _inspect.default)(fragType)), node));
+      }
+    }
+  };
+}
+
+function getFragmentType(context, name) {
+  var frag = context.getFragment(name);
+
+  if (frag) {
+    var type = (0, _typeFromAST.typeFromAST)(context.getSchema(), frag.typeCondition);
+
+    if ((0, _definition.isCompositeType)(type)) {
+      return type;
+    }
+  }
+}