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return new PathVisitor; } function Visitor() { if (!(this instanceof Visitor)) { throw new Error( "Visitor constructor cannot be invoked without 'new'" ); } PathVisitor.call(this); } var Vp = Visitor.prototype = Object.create(PVp); Vp.constructor = Visitor; extend(Vp, methods); extend(Visitor, PathVisitor); isFunction.assert(Visitor.fromMethodsObject); isFunction.assert(Visitor.visit); return new Visitor; }; function extend(target, source) { for (var property in source) { if (hasOwn.call(source, property)) { target[property] = source[property]; } } return target; } PathVisitor.visit = function visit(node, methods) { return PathVisitor.fromMethodsObject(methods).visit(node); }; var PVp = PathVisitor.prototype; PVp.visit = function () { if (this._visiting) { throw new Error( "Recursively calling visitor.visit(path) resets visitor state. " + "Try this.visit(path) or this.traverse(path) instead." ); } // Private state that needs to be reset before every traversal. this._visiting = true; this._changeReported = false; this._abortRequested = false; var argc = arguments.length; var args = new Array(argc) for (var i = 0; i < argc; ++i) { args[i] = arguments[i]; } if (!(args[0] instanceof NodePath)) { args[0] = new NodePath({root: args[0]}).get("root"); } // Called with the same arguments as .visit. this.reset.apply(this, args); try { var root = this.visitWithoutReset(args[0]); var didNotThrow = true; } finally { this._visiting = false; if (!didNotThrow && this._abortRequested) { // If this.visitWithoutReset threw an exception and // this._abortRequested was set to true, return the root of // the AST instead of letting the exception propagate, so that // client code does not have to provide a try-catch block to // intercept the AbortRequest exception. Other kinds of // exceptions will propagate without being intercepted and // rethrown by a catch block, so their stacks will accurately // reflect the original throwing context. return args[0].value; } } return root; }; PVp.AbortRequest = function AbortRequest() {}; PVp.abort = function () { var visitor = this; visitor._abortRequested = true; var request = new visitor.AbortRequest(); // If you decide to catch this exception and stop it from propagating, // make sure to call its cancel method to avoid silencing other // exceptions that might be thrown later in the traversal. request.cancel = function () { visitor._abortRequested = false; }; throw request; }; PVp.reset = function (path/*, additional arguments */) { // Empty stub; may be reassigned or overridden by subclasses. }; PVp.visitWithoutReset = function (path) { if (this instanceof this.Context) { // Since this.Context.prototype === this, there's a chance we // might accidentally call context.visitWithoutReset. If that // happens, re-invoke the method against context.visitor. return this.visitor.visitWithoutReset(path); } if (!(path instanceof NodePath)) { throw new Error(""); } var value = path.value; var methodName = value && typeof value === "object" && typeof value.type === "string" && this._methodNameTable[value.type]; if (methodName) { var context = this.acquireContext(path); try { return context.invokeVisitorMethod(methodName); } finally { this.releaseContext(context); } } else { // If there was no visitor method to call, visit the children of // this node generically. return visitChildren(path, this); } }; function visitChildren(path, visitor) { if (!(path instanceof NodePath)) { throw new Error(""); } if (!(visitor instanceof PathVisitor)) { throw new Error(""); } var value = path.value; if (isArray.check(value)) { path.each(visitor.visitWithoutReset, visitor); } else if (!isObject.check(value)) { // No children to visit. } else { var childNames = types.getFieldNames(value); // The .comments field of the Node type is hidden, so we only // visit it if the visitor defines visitBlock or visitLine, and // value.comments is defined. if (visitor._shouldVisitComments && value.comments && childNames.indexOf("comments") < 0) { childNames.push("comments"); } var childCount = childNames.length; var childPaths = []; for (var i = 0; i < childCount; ++i) { var childName = childNames[i]; if (!hasOwn.call(value, childName)) { value[childName] = types.getFieldValue(value, childName); } childPaths.push(path.get(childName)); } for (var i = 0; i < childCount; ++i) { visitor.visitWithoutReset(childPaths[i]); } } return path.value; } PVp.acquireContext = function (path) { if (this._reusableContextStack.length === 0) { return new this.Context(path); } return this._reusableContextStack.pop().reset(path); }; PVp.releaseContext = function (context) { if (!(context instanceof this.Context)) { throw new Error(""); } this._reusableContextStack.push(context); context.currentPath = null; }; PVp.reportChanged = function () { this._changeReported = true; }; PVp.wasChangeReported = function () { return this._changeReported; }; function makeContextConstructor(visitor) { function Context(path) { if (!(this instanceof Context)) { throw new Error(""); } if (!(this instanceof PathVisitor)) { throw new Error(""); } if (!(path instanceof NodePath)) { throw new Error(""); } Object.defineProperty(this, "visitor", { value: visitor, writable: false, enumerable: true, configurable: false }); this.currentPath = path; this.needToCallTraverse = true; Object.seal(this); } if (!(visitor instanceof PathVisitor)) { throw new Error(""); } // Note that the visitor object is the prototype of Context.prototype, // so all visitor methods are inherited by context objects. var Cp = Context.prototype = Object.create(visitor); Cp.constructor = Context; extend(Cp, sharedContextProtoMethods); return Context; } // Every PathVisitor has a different this.Context constructor and // this.Context.prototype object, but those prototypes can all use the // same reset, invokeVisitorMethod, and traverse function objects. var sharedContextProtoMethods = Object.create(null); sharedContextProtoMethods.reset = function reset(path) { if (!(this instanceof this.Context)) { throw new Error(""); } if (!(path instanceof NodePath)) { throw new Error(""); } this.currentPath = path; this.needToCallTraverse = true; return this; }; sharedContextProtoMethods.invokeVisitorMethod = function invokeVisitorMethod(methodName) { if (!(this instanceof this.Context)) { throw new Error(""); } if (!(this.currentPath instanceof NodePath)) { throw new Error(""); } var result = this.visitor[methodName].call(this, this.currentPath); if (result === false) { // Visitor methods return false to indicate that they have handled // their own traversal needs, and we should not complain if // this.needToCallTraverse is still true. this.needToCallTraverse = false; } else if (result !== undefined) { // Any other non-undefined value returned from the visitor method // is interpreted as a replacement value. this.currentPath = this.currentPath.replace(result)[0]; if (this.needToCallTraverse) { // If this.traverse still hasn't been called, visit the // children of the replacement node. this.traverse(this.currentPath); } } if (this.needToCallTraverse !== false) { throw new Error( "Must either call this.traverse or return false in " + methodName ); } var path = this.currentPath; return path && path.value; }; sharedContextProtoMethods.traverse = function traverse(path, newVisitor) { if (!(this instanceof this.Context)) { throw new Error(""); } if (!(path instanceof NodePath)) { throw new Error(""); } if (!(this.currentPath instanceof NodePath)) { throw new Error(""); } this.needToCallTraverse = false; return visitChildren(path, PathVisitor.fromMethodsObject( newVisitor || this.visitor )); }; sharedContextProtoMethods.visit = function visit(path, newVisitor) { if (!(this instanceof this.Context)) { throw new Error(""); } if (!(path instanceof NodePath)) { throw new Error(""); } if (!(this.currentPath instanceof NodePath)) { throw new Error(""); } this.needToCallTraverse = false; return PathVisitor.fromMethodsObject( newVisitor || this.visitor ).visitWithoutReset(path); }; sharedContextProtoMethods.reportChanged = function reportChanged() { this.visitor.reportChanged(); }; sharedContextProtoMethods.abort = function abort() { this.needToCallTraverse = false; this.visitor.abort(); }; return PathVisitor; };