@angular/core/schematics/utils/template_ast_visitor.js

Angular - the core framework

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
(function (factory) {
    if (typeof module === "object" && typeof module.exports === "object") {
        var v = factory(require, exports);
        if (v !== undefined) module.exports = v;
    }
    else if (typeof define === "function" && define.amd) {
        define("@angular/core/schematics/utils/template_ast_visitor", ["require", "exports"], factory);
    }
})(function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    exports.TemplateAstVisitor = void 0;
    /**
     * A base class that can be used to implement a Render3 Template AST visitor.
     * This class is used instead of the `NullVisitor` found within the `@angular/compiler` because
     * the `NullVisitor` requires a deep import which is no longer supported with the ESM bundled
     * packages as of v13.
     * Schematics are also currently required to be CommonJS to support execution within the Angular
     * CLI. As a result, the ESM `@angular/compiler` package must be loaded via a native dynamic import.
     * Using a dynamic import makes classes extending from classes present in `@angular/compiler`
     * complicated due to the class not being present at module evaluation time. The classes using a
     * base class found within `@angular/compiler` must be wrapped in a factory to allow the class value
     * to be accessible at runtime after the dynamic import has completed. This class implements the
     * interface of the `TmplAstRecursiveVisitor` class (but does not extend) as the
     * `TmplAstRecursiveVisitor` as an interface provides the required set of visit methods. The base
     * interface `Visitor<T>` is not exported.
     */
    class TemplateAstVisitor {
        /**
         * Creates a new Render3 Template AST visitor using an instance of the `@angular/compiler`
         * package. Passing in the compiler is required due to the need to dynamically import the
         * ESM `@angular/compiler` into a CommonJS schematic.
         *
         * @param compilerModule The compiler instance that should be used within the visitor.
         */
        constructor(compilerModule) {
            this.compilerModule = compilerModule;
        }
        visitElement(element) { }
        visitTemplate(template) { }
        visitContent(content) { }
        visitVariable(variable) { }
        visitReference(reference) { }
        visitTextAttribute(attribute) { }
        visitBoundAttribute(attribute) { }
        visitBoundEvent(attribute) { }
        visitText(text) { }
        visitBoundText(text) { }
        visitIcu(icu) { }
        /**
         * Visits all the provided nodes in order using this Visitor's visit methods.
         * This is a simplified variant of the `visitAll` function found inside of (but not
         * exported from) the `@angular/compiler` that does not support returning a value
         * since the migrations do not directly transform the nodes.
         *
         * @param nodes An iterable of nodes to visit using this visitor.
         */
        visitAll(nodes) {
            for (const node of nodes) {
                node.visit(this);
            }
        }
    }
    exports.TemplateAstVisitor = TemplateAstVisitor;
});
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