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node_modules/graphql/language/visitor.mjs

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+import inspect from '../jsutils/inspect';
+export var QueryDocumentKeys = {
+  Name: [],
+  Document: ['definitions'],
+  OperationDefinition: ['name', 'variableDefinitions', 'directives', 'selectionSet'],
+  VariableDefinition: ['variable', 'type', 'defaultValue', 'directives'],
+  Variable: ['name'],
+  SelectionSet: ['selections'],
+  Field: ['alias', 'name', 'arguments', 'directives', 'selectionSet'],
+  Argument: ['name', 'value'],
+  FragmentSpread: ['name', 'directives'],
+  InlineFragment: ['typeCondition', 'directives', 'selectionSet'],
+  FragmentDefinition: ['name', // Note: fragment variable definitions are experimental and may be changed
+  // or removed in the future.
+  'variableDefinitions', 'typeCondition', 'directives', 'selectionSet'],
+  IntValue: [],
+  FloatValue: [],
+  StringValue: [],
+  BooleanValue: [],
+  NullValue: [],
+  EnumValue: [],
+  ListValue: ['values'],
+  ObjectValue: ['fields'],
+  ObjectField: ['name', 'value'],
+  Directive: ['name', 'arguments'],
+  NamedType: ['name'],
+  ListType: ['type'],
+  NonNullType: ['type'],
+  SchemaDefinition: ['directives', 'operationTypes'],
+  OperationTypeDefinition: ['type'],
+  ScalarTypeDefinition: ['description', 'name', 'directives'],
+  ObjectTypeDefinition: ['description', 'name', 'interfaces', 'directives', 'fields'],
+  FieldDefinition: ['description', 'name', 'arguments', 'type', 'directives'],
+  InputValueDefinition: ['description', 'name', 'type', 'defaultValue', 'directives'],
+  InterfaceTypeDefinition: ['description', 'name', 'directives', 'fields'],
+  UnionTypeDefinition: ['description', 'name', 'directives', 'types'],
+  EnumTypeDefinition: ['description', 'name', 'directives', 'values'],
+  EnumValueDefinition: ['description', 'name', 'directives'],
+  InputObjectTypeDefinition: ['description', 'name', 'directives', 'fields'],
+  DirectiveDefinition: ['description', 'name', 'arguments', 'locations'],
+  SchemaExtension: ['directives', 'operationTypes'],
+  ScalarTypeExtension: ['name', 'directives'],
+  ObjectTypeExtension: ['name', 'interfaces', 'directives', 'fields'],
+  InterfaceTypeExtension: ['name', 'directives', 'fields'],
+  UnionTypeExtension: ['name', 'directives', 'types'],
+  EnumTypeExtension: ['name', 'directives', 'values'],
+  InputObjectTypeExtension: ['name', 'directives', 'fields']
+};
+export var BREAK = Object.freeze({});
+/**
+ * visit() will walk through an AST using a depth first traversal, calling
+ * the visitor's enter function at each node in the traversal, and calling the
+ * leave function after visiting that node and all of its child nodes.
+ *
+ * By returning different values from the enter and leave functions, the
+ * behavior of the visitor can be altered, including skipping over a sub-tree of
+ * the AST (by returning false), editing the AST by returning a value or null
+ * to remove the value, or to stop the whole traversal by returning BREAK.
+ *
+ * When using visit() to edit an AST, the original AST will not be modified, and
+ * a new version of the AST with the changes applied will be returned from the
+ * visit function.
+ *
+ *     const editedAST = visit(ast, {
+ *       enter(node, key, parent, path, ancestors) {
+ *         // @return
+ *         //   undefined: no action
+ *         //   false: skip visiting this node
+ *         //   visitor.BREAK: stop visiting altogether
+ *         //   null: delete this node
+ *         //   any value: replace this node with the returned value
+ *       },
+ *       leave(node, key, parent, path, ancestors) {
+ *         // @return
+ *         //   undefined: no action
+ *         //   false: no action
+ *         //   visitor.BREAK: stop visiting altogether
+ *         //   null: delete this node
+ *         //   any value: replace this node with the returned value
+ *       }
+ *     });
+ *
+ * Alternatively to providing enter() and leave() functions, a visitor can
+ * instead provide functions named the same as the kinds of AST nodes, or
+ * enter/leave visitors at a named key, leading to four permutations of
+ * visitor API:
+ *
+ * 1) Named visitors triggered when entering a node a specific kind.
+ *
+ *     visit(ast, {
+ *       Kind(node) {
+ *         // enter the "Kind" node
+ *       }
+ *     })
+ *
+ * 2) Named visitors that trigger upon entering and leaving a node of
+ *    a specific kind.
+ *
+ *     visit(ast, {
+ *       Kind: {
+ *         enter(node) {
+ *           // enter the "Kind" node
+ *         }
+ *         leave(node) {
+ *           // leave the "Kind" node
+ *         }
+ *       }
+ *     })
+ *
+ * 3) Generic visitors that trigger upon entering and leaving any node.
+ *
+ *     visit(ast, {
+ *       enter(node) {
+ *         // enter any node
+ *       },
+ *       leave(node) {
+ *         // leave any node
+ *       }
+ *     })
+ *
+ * 4) Parallel visitors for entering and leaving nodes of a specific kind.
+ *
+ *     visit(ast, {
+ *       enter: {
+ *         Kind(node) {
+ *           // enter the "Kind" node
+ *         }
+ *       },
+ *       leave: {
+ *         Kind(node) {
+ *           // leave the "Kind" node
+ *         }
+ *       }
+ *     })
+ */
+
+export function visit(root, visitor) {
+  var visitorKeys = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : QueryDocumentKeys;
+
+  /* eslint-disable no-undef-init */
+  var stack = undefined;
+  var inArray = Array.isArray(root);
+  var keys = [root];
+  var index = -1;
+  var edits = [];
+  var node = undefined;
+  var key = undefined;
+  var parent = undefined;
+  var path = [];
+  var ancestors = [];
+  var newRoot = root;
+  /* eslint-enable no-undef-init */
+
+  do {
+    index++;
+    var isLeaving = index === keys.length;
+    var isEdited = isLeaving && edits.length !== 0;
+
+    if (isLeaving) {
+      key = ancestors.length === 0 ? undefined : path[path.length - 1];
+      node = parent;
+      parent = ancestors.pop();
+
+      if (isEdited) {
+        if (inArray) {
+          node = node.slice();
+        } else {
+          var clone = {};
+
+          for (var _i2 = 0, _Object$keys2 = Object.keys(node); _i2 < _Object$keys2.length; _i2++) {
+            var k = _Object$keys2[_i2];
+            clone[k] = node[k];
+          }
+
+          node = clone;
+        }
+
+        var editOffset = 0;
+
+        for (var ii = 0; ii < edits.length; ii++) {
+          var editKey = edits[ii][0];
+          var editValue = edits[ii][1];
+
+          if (inArray) {
+            editKey -= editOffset;
+          }
+
+          if (inArray && editValue === null) {
+            node.splice(editKey, 1);
+            editOffset++;
+          } else {
+            node[editKey] = editValue;
+          }
+        }
+      }
+
+      index = stack.index;
+      keys = stack.keys;
+      edits = stack.edits;
+      inArray = stack.inArray;
+      stack = stack.prev;
+    } else {
+      key = parent ? inArray ? index : keys[index] : undefined;
+      node = parent ? parent[key] : newRoot;
+
+      if (node === null || node === undefined) {
+        continue;
+      }
+
+      if (parent) {
+        path.push(key);
+      }
+    }
+
+    var result = void 0;
+
+    if (!Array.isArray(node)) {
+      if (!isNode(node)) {
+        throw new Error('Invalid AST Node: ' + inspect(node));
+      }
+
+      var visitFn = getVisitFn(visitor, node.kind, isLeaving);
+
+      if (visitFn) {
+        result = visitFn.call(visitor, node, key, parent, path, ancestors);
+
+        if (result === BREAK) {
+          break;
+        }
+
+        if (result === false) {
+          if (!isLeaving) {
+            path.pop();
+            continue;
+          }
+        } else if (result !== undefined) {
+          edits.push([key, result]);
+
+          if (!isLeaving) {
+            if (isNode(result)) {
+              node = result;
+            } else {
+              path.pop();
+              continue;
+            }
+          }
+        }
+      }
+    }
+
+    if (result === undefined && isEdited) {
+      edits.push([key, node]);
+    }
+
+    if (isLeaving) {
+      path.pop();
+    } else {
+      stack = {
+        inArray: inArray,
+        index: index,
+        keys: keys,
+        edits: edits,
+        prev: stack
+      };
+      inArray = Array.isArray(node);
+      keys = inArray ? node : visitorKeys[node.kind] || [];
+      index = -1;
+      edits = [];
+
+      if (parent) {
+        ancestors.push(parent);
+      }
+
+      parent = node;
+    }
+  } while (stack !== undefined);
+
+  if (edits.length !== 0) {
+    newRoot = edits[edits.length - 1][1];
+  }
+
+  return newRoot;
+}
+
+function isNode(maybeNode) {
+  return Boolean(maybeNode && typeof maybeNode.kind === 'string');
+}
+/**
+ * Creates a new visitor instance which delegates to many visitors to run in
+ * parallel. Each visitor will be visited for each node before moving on.
+ *
+ * If a prior visitor edits a node, no following visitors will see that node.
+ */
+
+
+export function visitInParallel(visitors) {
+  var skipping = new Array(visitors.length);
+  return {
+    enter: function enter(node) {
+      for (var i = 0; i < visitors.length; i++) {
+        if (!skipping[i]) {
+          var fn = getVisitFn(visitors[i], node.kind,
+          /* isLeaving */
+          false);
+
+          if (fn) {
+            var result = fn.apply(visitors[i], arguments);
+
+            if (result === false) {
+              skipping[i] = node;
+            } else if (result === BREAK) {
+              skipping[i] = BREAK;
+            } else if (result !== undefined) {
+              return result;
+            }
+          }
+        }
+      }
+    },
+    leave: function leave(node) {
+      for (var i = 0; i < visitors.length; i++) {
+        if (!skipping[i]) {
+          var fn = getVisitFn(visitors[i], node.kind,
+          /* isLeaving */
+          true);
+
+          if (fn) {
+            var result = fn.apply(visitors[i], arguments);
+
+            if (result === BREAK) {
+              skipping[i] = BREAK;
+            } else if (result !== undefined && result !== false) {
+              return result;
+            }
+          }
+        } else if (skipping[i] === node) {
+          skipping[i] = null;
+        }
+      }
+    }
+  };
+}
+/**
+ * Creates a new visitor instance which maintains a provided TypeInfo instance
+ * along with visiting visitor.
+ */
+
+export function visitWithTypeInfo(typeInfo, visitor) {
+  return {
+    enter: function enter(node) {
+      typeInfo.enter(node);
+      var fn = getVisitFn(visitor, node.kind,
+      /* isLeaving */
+      false);
+
+      if (fn) {
+        var result = fn.apply(visitor, arguments);
+
+        if (result !== undefined) {
+          typeInfo.leave(node);
+
+          if (isNode(result)) {
+            typeInfo.enter(result);
+          }
+        }
+
+        return result;
+      }
+    },
+    leave: function leave(node) {
+      var fn = getVisitFn(visitor, node.kind,
+      /* isLeaving */
+      true);
+      var result;
+
+      if (fn) {
+        result = fn.apply(visitor, arguments);
+      }
+
+      typeInfo.leave(node);
+      return result;
+    }
+  };
+}
+/**
+ * Given a visitor instance, if it is leaving or not, and a node kind, return
+ * the function the visitor runtime should call.
+ */
+
+export function getVisitFn(visitor, kind, isLeaving) {
+  var kindVisitor = visitor[kind];
+
+  if (kindVisitor) {
+    if (!isLeaving && typeof kindVisitor === 'function') {
+      // { Kind() {} }
+      return kindVisitor;
+    }
+
+    var kindSpecificVisitor = isLeaving ? kindVisitor.leave : kindVisitor.enter;
+
+    if (typeof kindSpecificVisitor === 'function') {
+      // { Kind: { enter() {}, leave() {} } }
+      return kindSpecificVisitor;
+    }
+  } else {
+    var specificVisitor = isLeaving ? visitor.leave : visitor.enter;
+
+    if (specificVisitor) {
+      if (typeof specificVisitor === 'function') {
+        // { enter() {}, leave() {} }
+        return specificVisitor;
+      }
+
+      var specificKindVisitor = specificVisitor[kind];
+
+      if (typeof specificKindVisitor === 'function') {
+        // { enter: { Kind() {} }, leave: { Kind() {} } }
+        return specificKindVisitor;
+      }
+    }
+  }
+}