source: trip-planner-front/node_modules/@angular/compiler/esm2015/src/render3/view/t2_binder.js

/**
 * @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
 */
import { AST, ImplicitReceiver, RecursiveAstVisitor } from '../../expression_parser/ast';
import { Template } from '../r3_ast';
import { createCssSelector } from './template';
import { getAttrsForDirectiveMatching } from './util';
/**
 * Processes `Target`s with a given set of directives and performs a binding operation, which
 * returns an object similar to TypeScript's `ts.TypeChecker` that contains knowledge about the
 * target.
 */
export class R3TargetBinder {
    constructor(directiveMatcher) {
        this.directiveMatcher = directiveMatcher;
    }
    /**
     * Perform a binding operation on the given `Target` and return a `BoundTarget` which contains
     * metadata about the types referenced in the template.
     */
    bind(target) {
        if (!target.template) {
            // TODO(alxhub): handle targets which contain things like HostBindings, etc.
            throw new Error('Binding without a template not yet supported');
        }
        // First, parse the template into a `Scope` structure. This operation captures the syntactic
        // scopes in the template and makes them available for later use.
        const scope = Scope.apply(target.template);
        // Use the `Scope` to extract the entities present at every level of the template.
        const templateEntities = extractTemplateEntities(scope);
        // Next, perform directive matching on the template using the `DirectiveBinder`. This returns:
        //   - directives: Map of nodes (elements & ng-templates) to the directives on them.
        //   - bindings: Map of inputs, outputs, and attributes to the directive/element that claims
        //     them. TODO(alxhub): handle multiple directives claiming an input/output/etc.
        //   - references: Map of #references to their targets.
        const { directives, bindings, references } = DirectiveBinder.apply(target.template, this.directiveMatcher);
        // Finally, run the TemplateBinder to bind references, variables, and other entities within the
        // template. This extracts all the metadata that doesn't depend on directive matching.
        const { expressions, symbols, nestingLevel, usedPipes } = TemplateBinder.applyWithScope(target.template, scope);
        return new R3BoundTarget(target, directives, bindings, references, expressions, symbols, nestingLevel, templateEntities, usedPipes);
    }
}
/**
 * Represents a binding scope within a template.
 *
 * Any variables, references, or other named entities declared within the template will
 * be captured and available by name in `namedEntities`. Additionally, child templates will
 * be analyzed and have their child `Scope`s available in `childScopes`.
 */
class Scope {
    constructor(parentScope, template) {
        this.parentScope = parentScope;
        this.template = template;
        /**
         * Named members of the `Scope`, such as `Reference`s or `Variable`s.
         */
        this.namedEntities = new Map();
        /**
         * Child `Scope`s for immediately nested `Template`s.
         */
        this.childScopes = new Map();
    }
    static newRootScope() {
        return new Scope(null, null);
    }
    /**
     * Process a template (either as a `Template` sub-template with variables, or a plain array of
     * template `Node`s) and construct its `Scope`.
     */
    static apply(template) {
        const scope = Scope.newRootScope();
        scope.ingest(template);
        return scope;
    }
    /**
     * Internal method to process the template and populate the `Scope`.
     */
    ingest(template) {
        if (template instanceof Template) {
            // Variables on an <ng-template> are defined in the inner scope.
            template.variables.forEach(node => this.visitVariable(node));
            // Process the nodes of the template.
            template.children.forEach(node => node.visit(this));
        }
        else {
            // No overarching `Template` instance, so process the nodes directly.
            template.forEach(node => node.visit(this));
        }
    }
    visitElement(element) {
        // `Element`s in the template may have `Reference`s which are captured in the scope.
        element.references.forEach(node => this.visitReference(node));
        // Recurse into the `Element`'s children.
        element.children.forEach(node => node.visit(this));
    }
    visitTemplate(template) {
        // References on a <ng-template> are defined in the outer scope, so capture them before
        // processing the template's child scope.
        template.references.forEach(node => this.visitReference(node));
        // Next, create an inner scope and process the template within it.
        const scope = new Scope(this, template);
        scope.ingest(template);
        this.childScopes.set(template, scope);
    }
    visitVariable(variable) {
        // Declare the variable if it's not already.
        this.maybeDeclare(variable);
    }
    visitReference(reference) {
        // Declare the variable if it's not already.
        this.maybeDeclare(reference);
    }
    // Unused visitors.
    visitContent(content) { }
    visitBoundAttribute(attr) { }
    visitBoundEvent(event) { }
    visitBoundText(text) { }
    visitText(text) { }
    visitTextAttribute(attr) { }
    visitIcu(icu) { }
    maybeDeclare(thing) {
        // Declare something with a name, as long as that name isn't taken.
        if (!this.namedEntities.has(thing.name)) {
            this.namedEntities.set(thing.name, thing);
        }
    }
    /**
     * Look up a variable within this `Scope`.
     *
     * This can recurse into a parent `Scope` if it's available.
     */
    lookup(name) {
        if (this.namedEntities.has(name)) {
            // Found in the local scope.
            return this.namedEntities.get(name);
        }
        else if (this.parentScope !== null) {
            // Not in the local scope, but there's a parent scope so check there.
            return this.parentScope.lookup(name);
        }
        else {
            // At the top level and it wasn't found.
            return null;
        }
    }
    /**
     * Get the child scope for a `Template`.
     *
     * This should always be defined.
     */
    getChildScope(template) {
        const res = this.childScopes.get(template);
        if (res === undefined) {
            throw new Error(`Assertion error: child scope for ${template} not found`);
        }
        return res;
    }
}
/**
 * Processes a template and matches directives on nodes (elements and templates).
 *
 * Usually used via the static `apply()` method.
 */
class DirectiveBinder {
    constructor(matcher, directives, bindings, references) {
        this.matcher = matcher;
        this.directives = directives;
        this.bindings = bindings;
        this.references = references;
    }
    /**
     * Process a template (list of `Node`s) and perform directive matching against each node.
     *
     * @param template the list of template `Node`s to match (recursively).
     * @param selectorMatcher a `SelectorMatcher` containing the directives that are in scope for
     * this template.
     * @returns three maps which contain information about directives in the template: the
     * `directives` map which lists directives matched on each node, the `bindings` map which
     * indicates which directives claimed which bindings (inputs, outputs, etc), and the `references`
     * map which resolves #references (`Reference`s) within the template to the named directive or
     * template node.
     */
    static apply(template, selectorMatcher) {
        const directives = new Map();
        const bindings = new Map();
        const references = new Map();
        const matcher = new DirectiveBinder(selectorMatcher, directives, bindings, references);
        matcher.ingest(template);
        return { directives, bindings, references };
    }
    ingest(template) {
        template.forEach(node => node.visit(this));
    }
    visitElement(element) {
        this.visitElementOrTemplate(element.name, element);
    }
    visitTemplate(template) {
        this.visitElementOrTemplate('ng-template', template);
    }
    visitElementOrTemplate(elementName, node) {
        // First, determine the HTML shape of the node for the purpose of directive matching.
        // Do this by building up a `CssSelector` for the node.
        const cssSelector = createCssSelector(elementName, getAttrsForDirectiveMatching(node));
        // Next, use the `SelectorMatcher` to get the list of directives on the node.
        const directives = [];
        this.matcher.match(cssSelector, (_, directive) => directives.push(directive));
        if (directives.length > 0) {
            this.directives.set(node, directives);
        }
        // Resolve any references that are created on this node.
        node.references.forEach(ref => {
            let dirTarget = null;
            // If the reference expression is empty, then it matches the "primary" directive on the node
            // (if there is one). Otherwise it matches the host node itself (either an element or
            // <ng-template> node).
            if (ref.value.trim() === '') {
                // This could be a reference to a component if there is one.
                dirTarget = directives.find(dir => dir.isComponent) || null;
            }
            else {
                // This should be a reference to a directive exported via exportAs.
                dirTarget =
                    directives.find(dir => dir.exportAs !== null && dir.exportAs.some(value => value === ref.value)) ||
                        null;
                // Check if a matching directive was found.
                if (dirTarget === null) {
                    // No matching directive was found - this reference points to an unknown target. Leave it
                    // unmapped.
                    return;
                }
            }
            if (dirTarget !== null) {
                // This reference points to a directive.
                this.references.set(ref, { directive: dirTarget, node });
            }
            else {
                // This reference points to the node itself.
                this.references.set(ref, node);
            }
        });
        const setAttributeBinding = (attribute, ioType) => {
            const dir = directives.find(dir => dir[ioType].hasBindingPropertyName(attribute.name));
            const binding = dir !== undefined ? dir : node;
            this.bindings.set(attribute, binding);
        };
        // Node inputs (bound attributes) and text attributes can be bound to an
        // input on a directive.
        node.inputs.forEach(input => setAttributeBinding(input, 'inputs'));
        node.attributes.forEach(attr => setAttributeBinding(attr, 'inputs'));
        if (node instanceof Template) {
            node.templateAttrs.forEach(attr => setAttributeBinding(attr, 'inputs'));
        }
        // Node outputs (bound events) can be bound to an output on a directive.
        node.outputs.forEach(output => setAttributeBinding(output, 'outputs'));
        // Recurse into the node's children.
        node.children.forEach(child => child.visit(this));
    }
    // Unused visitors.
    visitContent(content) { }
    visitVariable(variable) { }
    visitReference(reference) { }
    visitTextAttribute(attribute) { }
    visitBoundAttribute(attribute) { }
    visitBoundEvent(attribute) { }
    visitBoundAttributeOrEvent(node) { }
    visitText(text) { }
    visitBoundText(text) { }
    visitIcu(icu) { }
}
/**
 * Processes a template and extract metadata about expressions and symbols within.
 *
 * This is a companion to the `DirectiveBinder` that doesn't require knowledge of directives matched
 * within the template in order to operate.
 *
 * Expressions are visited by the superclass `RecursiveAstVisitor`, with custom logic provided
 * by overridden methods from that visitor.
 */
class TemplateBinder extends RecursiveAstVisitor {
    constructor(bindings, symbols, usedPipes, nestingLevel, scope, template, level) {
        super();
        this.bindings = bindings;
        this.symbols = symbols;
        this.usedPipes = usedPipes;
        this.nestingLevel = nestingLevel;
        this.scope = scope;
        this.template = template;
        this.level = level;
        this.pipesUsed = [];
        // Save a bit of processing time by constructing this closure in advance.
        this.visitNode = (node) => node.visit(this);
    }
    // This method is defined to reconcile the type of TemplateBinder since both
    // RecursiveAstVisitor and Visitor define the visit() method in their
    // interfaces.
    visit(node, context) {
        if (node instanceof AST) {
            node.visit(this, context);
        }
        else {
            node.visit(this);
        }
    }
    /**
     * Process a template and extract metadata about expressions and symbols within.
     *
     * @param template the nodes of the template to process
     * @param scope the `Scope` of the template being processed.
     * @returns three maps which contain metadata about the template: `expressions` which interprets
     * special `AST` nodes in expressions as pointing to references or variables declared within the
     * template, `symbols` which maps those variables and references to the nested `Template` which
     * declares them, if any, and `nestingLevel` which associates each `Template` with a integer
     * nesting level (how many levels deep within the template structure the `Template` is), starting
     * at 1.
     */
    static applyWithScope(template, scope) {
        const expressions = new Map();
        const symbols = new Map();
        const nestingLevel = new Map();
        const usedPipes = new Set();
        // The top-level template has nesting level 0.
        const binder = new TemplateBinder(expressions, symbols, usedPipes, nestingLevel, scope, template instanceof Template ? template : null, 0);
        binder.ingest(template);
        return { expressions, symbols, nestingLevel, usedPipes };
    }
    ingest(template) {
        if (template instanceof Template) {
            // For <ng-template>s, process only variables and child nodes. Inputs, outputs, templateAttrs,
            // and references were all processed in the scope of the containing template.
            template.variables.forEach(this.visitNode);
            template.children.forEach(this.visitNode);
            // Set the nesting level.
            this.nestingLevel.set(template, this.level);
        }
        else {
            // Visit each node from the top-level template.
            template.forEach(this.visitNode);
        }
    }
    visitElement(element) {
        // Visit the inputs, outputs, and children of the element.
        element.inputs.forEach(this.visitNode);
        element.outputs.forEach(this.visitNode);
        element.children.forEach(this.visitNode);
    }
    visitTemplate(template) {
        // First, visit inputs, outputs and template attributes of the template node.
        template.inputs.forEach(this.visitNode);
        template.outputs.forEach(this.visitNode);
        template.templateAttrs.forEach(this.visitNode);
        // References are also evaluated in the outer context.
        template.references.forEach(this.visitNode);
        // Next, recurse into the template using its scope, and bumping the nesting level up by one.
        const childScope = this.scope.getChildScope(template);
        const binder = new TemplateBinder(this.bindings, this.symbols, this.usedPipes, this.nestingLevel, childScope, template, this.level + 1);
        binder.ingest(template);
    }
    visitVariable(variable) {
        // Register the `Variable` as a symbol in the current `Template`.
        if (this.template !== null) {
            this.symbols.set(variable, this.template);
        }
    }
    visitReference(reference) {
        // Register the `Reference` as a symbol in the current `Template`.
        if (this.template !== null) {
            this.symbols.set(reference, this.template);
        }
    }
    // Unused template visitors
    visitText(text) { }
    visitContent(content) { }
    visitTextAttribute(attribute) { }
    visitIcu(icu) {
        Object.keys(icu.vars).forEach(key => icu.vars[key].visit(this));
        Object.keys(icu.placeholders).forEach(key => icu.placeholders[key].visit(this));
    }
    // The remaining visitors are concerned with processing AST expressions within template bindings
    visitBoundAttribute(attribute) {
        attribute.value.visit(this);
    }
    visitBoundEvent(event) {
        event.handler.visit(this);
    }
    visitBoundText(text) {
        text.value.visit(this);
    }
    visitPipe(ast, context) {
        this.usedPipes.add(ast.name);
        return super.visitPipe(ast, context);
    }
    // These five types of AST expressions can refer to expression roots, which could be variables
    // or references in the current scope.
    visitPropertyRead(ast, context) {
        this.maybeMap(context, ast, ast.name);
        return super.visitPropertyRead(ast, context);
    }
    visitSafePropertyRead(ast, context) {
        this.maybeMap(context, ast, ast.name);
        return super.visitSafePropertyRead(ast, context);
    }
    visitPropertyWrite(ast, context) {
        this.maybeMap(context, ast, ast.name);
        return super.visitPropertyWrite(ast, context);
    }
    visitMethodCall(ast, context) {
        this.maybeMap(context, ast, ast.name);
        return super.visitMethodCall(ast, context);
    }
    visitSafeMethodCall(ast, context) {
        this.maybeMap(context, ast, ast.name);
        return super.visitSafeMethodCall(ast, context);
    }
    maybeMap(scope, ast, name) {
        // If the receiver of the expression isn't the `ImplicitReceiver`, this isn't the root of an
        // `AST` expression that maps to a `Variable` or `Reference`.
        if (!(ast.receiver instanceof ImplicitReceiver)) {
            return;
        }
        // Check whether the name exists in the current scope. If so, map it. Otherwise, the name is
        // probably a property on the top-level component context.
        let target = this.scope.lookup(name);
        if (target !== null) {
            this.bindings.set(ast, target);
        }
    }
}
/**
 * Metadata container for a `Target` that allows queries for specific bits of metadata.
 *
 * See `BoundTarget` for documentation on the individual methods.
 */
export class R3BoundTarget {
    constructor(target, directives, bindings, references, exprTargets, symbols, nestingLevel, templateEntities, usedPipes) {
        this.target = target;
        this.directives = directives;
        this.bindings = bindings;
        this.references = references;
        this.exprTargets = exprTargets;
        this.symbols = symbols;
        this.nestingLevel = nestingLevel;
        this.templateEntities = templateEntities;
        this.usedPipes = usedPipes;
    }
    getEntitiesInTemplateScope(template) {
        var _a;
        return (_a = this.templateEntities.get(template)) !== null && _a !== void 0 ? _a : new Set();
    }
    getDirectivesOfNode(node) {
        return this.directives.get(node) || null;
    }
    getReferenceTarget(ref) {
        return this.references.get(ref) || null;
    }
    getConsumerOfBinding(binding) {
        return this.bindings.get(binding) || null;
    }
    getExpressionTarget(expr) {
        return this.exprTargets.get(expr) || null;
    }
    getTemplateOfSymbol(symbol) {
        return this.symbols.get(symbol) || null;
    }
    getNestingLevel(template) {
        return this.nestingLevel.get(template) || 0;
    }
    getUsedDirectives() {
        const set = new Set();
        this.directives.forEach(dirs => dirs.forEach(dir => set.add(dir)));
        return Array.from(set.values());
    }
    getUsedPipes() {
        return Array.from(this.usedPipes);
    }
}
function extractTemplateEntities(rootScope) {
    const entityMap = new Map();
    function extractScopeEntities(scope) {
        if (entityMap.has(scope.template)) {
            return entityMap.get(scope.template);
        }
        const currentEntities = scope.namedEntities;
        let templateEntities;
        if (scope.parentScope !== null) {
            templateEntities = new Map([...extractScopeEntities(scope.parentScope), ...currentEntities]);
        }
        else {
            templateEntities = new Map(currentEntities);
        }
        entityMap.set(scope.template, templateEntities);
        return templateEntities;
    }
    const scopesToProcess = [rootScope];
    while (scopesToProcess.length > 0) {
        const scope = scopesToProcess.pop();
        for (const childScope of scope.childScopes.values()) {
            scopesToProcess.push(childScope);
        }
        extractScopeEntities(scope);
    }
    const templateEntities = new Map();
    for (const [template, entities] of entityMap) {
        templateEntities.set(template, new Set(entities.values()));
    }
    return templateEntities;
}
//# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {AST, BindingPipe, ImplicitReceiver, MethodCall, PropertyRead, PropertyWrite, RecursiveAstVisitor, SafeMethodCall, SafePropertyRead} from '../../expression_parser/ast';\nimport {SelectorMatcher} from '../../selector';\nimport {BoundAttribute, BoundEvent, BoundText, Content, Element, Icu, Node, Reference, Template, Text, TextAttribute, Variable, Visitor} from '../r3_ast';\n\nimport {BoundTarget, DirectiveMeta, Target, TargetBinder} from './t2_api';\nimport {createCssSelector} from './template';\nimport {getAttrsForDirectiveMatching} from './util';\n\n\n/**\n * Processes `Target`s with a given set of directives and performs a binding operation, which\n * returns an object similar to TypeScript's `ts.TypeChecker` that contains knowledge about the\n * target.\n */\nexport class R3TargetBinder<DirectiveT extends DirectiveMeta> implements TargetBinder<DirectiveT> {\n  constructor(private directiveMatcher: SelectorMatcher<DirectiveT>) {}\n\n  /**\n   * Perform a binding operation on the given `Target` and return a `BoundTarget` which contains\n   * metadata about the types referenced in the template.\n   */\n  bind(target: Target): BoundTarget<DirectiveT> {\n    if (!target.template) {\n      // TODO(alxhub): handle targets which contain things like HostBindings, etc.\n      throw new Error('Binding without a template not yet supported');\n    }\n\n    // First, parse the template into a `Scope` structure. This operation captures the syntactic\n    // scopes in the template and makes them available for later use.\n    const scope = Scope.apply(target.template);\n\n\n    // Use the `Scope` to extract the entities present at every level of the template.\n    const templateEntities = extractTemplateEntities(scope);\n\n    // Next, perform directive matching on the template using the `DirectiveBinder`. This returns:\n    //   - directives: Map of nodes (elements & ng-templates) to the directives on them.\n    //   - bindings: Map of inputs, outputs, and attributes to the directive/element that claims\n    //     them. TODO(alxhub): handle multiple directives claiming an input/output/etc.\n    //   - references: Map of #references to their targets.\n    const {directives, bindings, references} =\n        DirectiveBinder.apply(target.template, this.directiveMatcher);\n    // Finally, run the TemplateBinder to bind references, variables, and other entities within the\n    // template. This extracts all the metadata that doesn't depend on directive matching.\n    const {expressions, symbols, nestingLevel, usedPipes} =\n        TemplateBinder.applyWithScope(target.template, scope);\n    return new R3BoundTarget(\n        target, directives, bindings, references, expressions, symbols, nestingLevel,\n        templateEntities, usedPipes);\n  }\n}\n\n/**\n * Represents a binding scope within a template.\n *\n * Any variables, references, or other named entities declared within the template will\n * be captured and available by name in `namedEntities`. Additionally, child templates will\n * be analyzed and have their child `Scope`s available in `childScopes`.\n */\nclass Scope implements Visitor {\n  /**\n   * Named members of the `Scope`, such as `Reference`s or `Variable`s.\n   */\n  readonly namedEntities = new Map<string, Reference|Variable>();\n\n  /**\n   * Child `Scope`s for immediately nested `Template`s.\n   */\n  readonly childScopes = new Map<Template, Scope>();\n\n  private constructor(readonly parentScope: Scope|null, readonly template: Template|null) {}\n\n  static newRootScope(): Scope {\n    return new Scope(null, null);\n  }\n\n  /**\n   * Process a template (either as a `Template` sub-template with variables, or a plain array of\n   * template `Node`s) and construct its `Scope`.\n   */\n  static apply(template: Node[]): Scope {\n    const scope = Scope.newRootScope();\n    scope.ingest(template);\n    return scope;\n  }\n\n  /**\n   * Internal method to process the template and populate the `Scope`.\n   */\n  private ingest(template: Template|Node[]): void {\n    if (template instanceof Template) {\n      // Variables on an <ng-template> are defined in the inner scope.\n      template.variables.forEach(node => this.visitVariable(node));\n\n      // Process the nodes of the template.\n      template.children.forEach(node => node.visit(this));\n    } else {\n      // No overarching `Template` instance, so process the nodes directly.\n      template.forEach(node => node.visit(this));\n    }\n  }\n\n  visitElement(element: Element) {\n    // `Element`s in the template may have `Reference`s which are captured in the scope.\n    element.references.forEach(node => this.visitReference(node));\n\n    // Recurse into the `Element`'s children.\n    element.children.forEach(node => node.visit(this));\n  }\n\n  visitTemplate(template: Template) {\n    // References on a <ng-template> are defined in the outer scope, so capture them before\n    // processing the template's child scope.\n    template.references.forEach(node => this.visitReference(node));\n\n    // Next, create an inner scope and process the template within it.\n    const scope = new Scope(this, template);\n    scope.ingest(template);\n    this.childScopes.set(template, scope);\n  }\n\n  visitVariable(variable: Variable) {\n    // Declare the variable if it's not already.\n    this.maybeDeclare(variable);\n  }\n\n  visitReference(reference: Reference) {\n    // Declare the variable if it's not already.\n    this.maybeDeclare(reference);\n  }\n\n  // Unused visitors.\n  visitContent(content: Content) {}\n  visitBoundAttribute(attr: BoundAttribute) {}\n  visitBoundEvent(event: BoundEvent) {}\n  visitBoundText(text: BoundText) {}\n  visitText(text: Text) {}\n  visitTextAttribute(attr: TextAttribute) {}\n  visitIcu(icu: Icu) {}\n\n  private maybeDeclare(thing: Reference|Variable) {\n    // Declare something with a name, as long as that name isn't taken.\n    if (!this.namedEntities.has(thing.name)) {\n      this.namedEntities.set(thing.name, thing);\n    }\n  }\n\n  /**\n   * Look up a variable within this `Scope`.\n   *\n   * This can recurse into a parent `Scope` if it's available.\n   */\n  lookup(name: string): Reference|Variable|null {\n    if (this.namedEntities.has(name)) {\n      // Found in the local scope.\n      return this.namedEntities.get(name)!;\n    } else if (this.parentScope !== null) {\n      // Not in the local scope, but there's a parent scope so check there.\n      return this.parentScope.lookup(name);\n    } else {\n      // At the top level and it wasn't found.\n      return null;\n    }\n  }\n\n  /**\n   * Get the child scope for a `Template`.\n   *\n   * This should always be defined.\n   */\n  getChildScope(template: Template): Scope {\n    const res = this.childScopes.get(template);\n    if (res === undefined) {\n      throw new Error(`Assertion error: child scope for ${template} not found`);\n    }\n    return res;\n  }\n}\n\n/**\n * Processes a template and matches directives on nodes (elements and templates).\n *\n * Usually used via the static `apply()` method.\n */\nclass DirectiveBinder<DirectiveT extends DirectiveMeta> implements Visitor {\n  constructor(\n      private matcher: SelectorMatcher<DirectiveT>,\n      private directives: Map<Element|Template, DirectiveT[]>,\n      private bindings: Map<BoundAttribute|BoundEvent|TextAttribute, DirectiveT|Element|Template>,\n      private references:\n          Map<Reference, {directive: DirectiveT, node: Element|Template}|Element|Template>) {}\n\n  /**\n   * Process a template (list of `Node`s) and perform directive matching against each node.\n   *\n   * @param template the list of template `Node`s to match (recursively).\n   * @param selectorMatcher a `SelectorMatcher` containing the directives that are in scope for\n   * this template.\n   * @returns three maps which contain information about directives in the template: the\n   * `directives` map which lists directives matched on each node, the `bindings` map which\n   * indicates which directives claimed which bindings (inputs, outputs, etc), and the `references`\n   * map which resolves #references (`Reference`s) within the template to the named directive or\n   * template node.\n   */\n  static apply<DirectiveT extends DirectiveMeta>(\n      template: Node[], selectorMatcher: SelectorMatcher<DirectiveT>): {\n    directives: Map<Element|Template, DirectiveT[]>,\n    bindings: Map<BoundAttribute|BoundEvent|TextAttribute, DirectiveT|Element|Template>,\n    references: Map<Reference, {directive: DirectiveT, node: Element|Template}|Element|Template>,\n  } {\n    const directives = new Map<Element|Template, DirectiveT[]>();\n    const bindings =\n        new Map<BoundAttribute|BoundEvent|TextAttribute, DirectiveT|Element|Template>();\n    const references =\n        new Map<Reference, {directive: DirectiveT, node: Element | Template}|Element|Template>();\n    const matcher = new DirectiveBinder(selectorMatcher, directives, bindings, references);\n    matcher.ingest(template);\n    return {directives, bindings, references};\n  }\n\n  private ingest(template: Node[]): void {\n    template.forEach(node => node.visit(this));\n  }\n\n  visitElement(element: Element): void {\n    this.visitElementOrTemplate(element.name, element);\n  }\n\n  visitTemplate(template: Template): void {\n    this.visitElementOrTemplate('ng-template', template);\n  }\n\n  visitElementOrTemplate(elementName: string, node: Element|Template): void {\n    // First, determine the HTML shape of the node for the purpose of directive matching.\n    // Do this by building up a `CssSelector` for the node.\n    const cssSelector = createCssSelector(elementName, getAttrsForDirectiveMatching(node));\n\n    // Next, use the `SelectorMatcher` to get the list of directives on the node.\n    const directives: DirectiveT[] = [];\n    this.matcher.match(cssSelector, (_, directive) => directives.push(directive));\n    if (directives.length > 0) {\n      this.directives.set(node, directives);\n    }\n\n    // Resolve any references that are created on this node.\n    node.references.forEach(ref => {\n      let dirTarget: DirectiveT|null = null;\n\n      // If the reference expression is empty, then it matches the \"primary\" directive on the node\n      // (if there is one). Otherwise it matches the host node itself (either an element or\n      // <ng-template> node).\n      if (ref.value.trim() === '') {\n        // This could be a reference to a component if there is one.\n        dirTarget = directives.find(dir => dir.isComponent) || null;\n      } else {\n        // This should be a reference to a directive exported via exportAs.\n        dirTarget =\n            directives.find(\n                dir => dir.exportAs !== null && dir.exportAs.some(value => value === ref.value)) ||\n            null;\n        // Check if a matching directive was found.\n        if (dirTarget === null) {\n          // No matching directive was found - this reference points to an unknown target. Leave it\n          // unmapped.\n          return;\n        }\n      }\n\n      if (dirTarget !== null) {\n        // This reference points to a directive.\n        this.references.set(ref, {directive: dirTarget, node});\n      } else {\n        // This reference points to the node itself.\n        this.references.set(ref, node);\n      }\n    });\n\n    // Associate attributes/bindings on the node with directives or with the node itself.\n    type BoundNode = BoundAttribute|BoundEvent|TextAttribute;\n    const setAttributeBinding =\n        (attribute: BoundNode, ioType: keyof Pick<DirectiveMeta, 'inputs'|'outputs'>) => {\n          const dir = directives.find(dir => dir[ioType].hasBindingPropertyName(attribute.name));\n          const binding = dir !== undefined ? dir : node;\n          this.bindings.set(attribute, binding);\n        };\n\n    // Node inputs (bound attributes) and text attributes can be bound to an\n    // input on a directive.\n    node.inputs.forEach(input => setAttributeBinding(input, 'inputs'));\n    node.attributes.forEach(attr => setAttributeBinding(attr, 'inputs'));\n    if (node instanceof Template) {\n      node.templateAttrs.forEach(attr => setAttributeBinding(attr, 'inputs'));\n    }\n    // Node outputs (bound events) can be bound to an output on a directive.\n    node.outputs.forEach(output => setAttributeBinding(output, 'outputs'));\n\n    // Recurse into the node's children.\n    node.children.forEach(child => child.visit(this));\n  }\n\n  // Unused visitors.\n  visitContent(content: Content): void {}\n  visitVariable(variable: Variable): void {}\n  visitReference(reference: Reference): void {}\n  visitTextAttribute(attribute: TextAttribute): void {}\n  visitBoundAttribute(attribute: BoundAttribute): void {}\n  visitBoundEvent(attribute: BoundEvent): void {}\n  visitBoundAttributeOrEvent(node: BoundAttribute|BoundEvent) {}\n  visitText(text: Text): void {}\n  visitBoundText(text: BoundText): void {}\n  visitIcu(icu: Icu): void {}\n}\n\n/**\n * Processes a template and extract metadata about expressions and symbols within.\n *\n * This is a companion to the `DirectiveBinder` that doesn't require knowledge of directives matched\n * within the template in order to operate.\n *\n * Expressions are visited by the superclass `RecursiveAstVisitor`, with custom logic provided\n * by overridden methods from that visitor.\n */\nclass TemplateBinder extends RecursiveAstVisitor implements Visitor {\n  private visitNode: (node: Node) => void;\n\n  private pipesUsed: string[] = [];\n\n  private constructor(\n      private bindings: Map<AST, Reference|Variable>,\n      private symbols: Map<Reference|Variable, Template>, private usedPipes: Set<string>,\n      private nestingLevel: Map<Template, number>, private scope: Scope,\n      private template: Template|null, private level: number) {\n    super();\n\n    // Save a bit of processing time by constructing this closure in advance.\n    this.visitNode = (node: Node) => node.visit(this);\n  }\n\n  // This method is defined to reconcile the type of TemplateBinder since both\n  // RecursiveAstVisitor and Visitor define the visit() method in their\n  // interfaces.\n  override visit(node: AST|Node, context?: any) {\n    if (node instanceof AST) {\n      node.visit(this, context);\n    } else {\n      node.visit(this);\n    }\n  }\n\n  /**\n   * Process a template and extract metadata about expressions and symbols within.\n   *\n   * @param template the nodes of the template to process\n   * @param scope the `Scope` of the template being processed.\n   * @returns three maps which contain metadata about the template: `expressions` which interprets\n   * special `AST` nodes in expressions as pointing to references or variables declared within the\n   * template, `symbols` which maps those variables and references to the nested `Template` which\n   * declares them, if any, and `nestingLevel` which associates each `Template` with a integer\n   * nesting level (how many levels deep within the template structure the `Template` is), starting\n   * at 1.\n   */\n  static applyWithScope(template: Node[], scope: Scope): {\n    expressions: Map<AST, Reference|Variable>,\n    symbols: Map<Variable|Reference, Template>,\n    nestingLevel: Map<Template, number>,\n    usedPipes: Set<string>,\n  } {\n    const expressions = new Map<AST, Reference|Variable>();\n    const symbols = new Map<Variable|Reference, Template>();\n    const nestingLevel = new Map<Template, number>();\n    const usedPipes = new Set<string>();\n    // The top-level template has nesting level 0.\n    const binder = new TemplateBinder(\n        expressions, symbols, usedPipes, nestingLevel, scope,\n        template instanceof Template ? template : null, 0);\n    binder.ingest(template);\n    return {expressions, symbols, nestingLevel, usedPipes};\n  }\n\n  private ingest(template: Template|Node[]): void {\n    if (template instanceof Template) {\n      // For <ng-template>s, process only variables and child nodes. Inputs, outputs, templateAttrs,\n      // and references were all processed in the scope of the containing template.\n      template.variables.forEach(this.visitNode);\n      template.children.forEach(this.visitNode);\n\n      // Set the nesting level.\n      this.nestingLevel.set(template, this.level);\n    } else {\n      // Visit each node from the top-level template.\n      template.forEach(this.visitNode);\n    }\n  }\n\n  visitElement(element: Element) {\n    // Visit the inputs, outputs, and children of the element.\n    element.inputs.forEach(this.visitNode);\n    element.outputs.forEach(this.visitNode);\n    element.children.forEach(this.visitNode);\n  }\n\n  visitTemplate(template: Template) {\n    // First, visit inputs, outputs and template attributes of the template node.\n    template.inputs.forEach(this.visitNode);\n    template.outputs.forEach(this.visitNode);\n    template.templateAttrs.forEach(this.visitNode);\n\n    // References are also evaluated in the outer context.\n    template.references.forEach(this.visitNode);\n\n    // Next, recurse into the template using its scope, and bumping the nesting level up by one.\n    const childScope = this.scope.getChildScope(template);\n    const binder = new TemplateBinder(\n        this.bindings, this.symbols, this.usedPipes, this.nestingLevel, childScope, template,\n        this.level + 1);\n    binder.ingest(template);\n  }\n\n  visitVariable(variable: Variable) {\n    // Register the `Variable` as a symbol in the current `Template`.\n    if (this.template !== null) {\n      this.symbols.set(variable, this.template);\n    }\n  }\n\n  visitReference(reference: Reference) {\n    // Register the `Reference` as a symbol in the current `Template`.\n    if (this.template !== null) {\n      this.symbols.set(reference, this.template);\n    }\n  }\n\n  // Unused template visitors\n\n  visitText(text: Text) {}\n  visitContent(content: Content) {}\n  visitTextAttribute(attribute: TextAttribute) {}\n  visitIcu(icu: Icu): void {\n    Object.keys(icu.vars).forEach(key => icu.vars[key].visit(this));\n    Object.keys(icu.placeholders).forEach(key => icu.placeholders[key].visit(this));\n  }\n\n  // The remaining visitors are concerned with processing AST expressions within template bindings\n\n  visitBoundAttribute(attribute: BoundAttribute) {\n    attribute.value.visit(this);\n  }\n\n  visitBoundEvent(event: BoundEvent) {\n    event.handler.visit(this);\n  }\n\n  visitBoundText(text: BoundText) {\n    text.value.visit(this);\n  }\n  override visitPipe(ast: BindingPipe, context: any): any {\n    this.usedPipes.add(ast.name);\n    return super.visitPipe(ast, context);\n  }\n\n  // These five types of AST expressions can refer to expression roots, which could be variables\n  // or references in the current scope.\n\n  override visitPropertyRead(ast: PropertyRead, context: any): any {\n    this.maybeMap(context, ast, ast.name);\n    return super.visitPropertyRead(ast, context);\n  }\n\n  override visitSafePropertyRead(ast: SafePropertyRead, context: any): any {\n    this.maybeMap(context, ast, ast.name);\n    return super.visitSafePropertyRead(ast, context);\n  }\n\n  override visitPropertyWrite(ast: PropertyWrite, context: any): any {\n    this.maybeMap(context, ast, ast.name);\n    return super.visitPropertyWrite(ast, context);\n  }\n\n  override visitMethodCall(ast: MethodCall, context: any): any {\n    this.maybeMap(context, ast, ast.name);\n    return super.visitMethodCall(ast, context);\n  }\n\n  override visitSafeMethodCall(ast: SafeMethodCall, context: any): any {\n    this.maybeMap(context, ast, ast.name);\n    return super.visitSafeMethodCall(ast, context);\n  }\n\n  private maybeMap(\n      scope: Scope, ast: PropertyRead|SafePropertyRead|PropertyWrite|MethodCall|SafeMethodCall,\n      name: string): void {\n    // If the receiver of the expression isn't the `ImplicitReceiver`, this isn't the root of an\n    // `AST` expression that maps to a `Variable` or `Reference`.\n    if (!(ast.receiver instanceof ImplicitReceiver)) {\n      return;\n    }\n\n    // Check whether the name exists in the current scope. If so, map it. Otherwise, the name is\n    // probably a property on the top-level component context.\n    let target = this.scope.lookup(name);\n    if (target !== null) {\n      this.bindings.set(ast, target);\n    }\n  }\n}\n\n/**\n * Metadata container for a `Target` that allows queries for specific bits of metadata.\n *\n * See `BoundTarget` for documentation on the individual methods.\n */\nexport class R3BoundTarget<DirectiveT extends DirectiveMeta> implements BoundTarget<DirectiveT> {\n  constructor(\n      readonly target: Target, private directives: Map<Element|Template, DirectiveT[]>,\n      private bindings: Map<BoundAttribute|BoundEvent|TextAttribute, DirectiveT|Element|Template>,\n      private references:\n          Map<BoundAttribute|BoundEvent|Reference|TextAttribute,\n              {directive: DirectiveT, node: Element|Template}|Element|Template>,\n      private exprTargets: Map<AST, Reference|Variable>,\n      private symbols: Map<Reference|Variable, Template>,\n      private nestingLevel: Map<Template, number>,\n      private templateEntities: Map<Template|null, ReadonlySet<Reference|Variable>>,\n      private usedPipes: Set<string>) {}\n\n  getEntitiesInTemplateScope(template: Template|null): ReadonlySet<Reference|Variable> {\n    return this.templateEntities.get(template) ?? new Set();\n  }\n\n  getDirectivesOfNode(node: Element|Template): DirectiveT[]|null {\n    return this.directives.get(node) || null;\n  }\n\n  getReferenceTarget(ref: Reference): {directive: DirectiveT, node: Element|Template}|Element\n      |Template|null {\n    return this.references.get(ref) || null;\n  }\n\n  getConsumerOfBinding(binding: BoundAttribute|BoundEvent|TextAttribute): DirectiveT|Element\n      |Template|null {\n    return this.bindings.get(binding) || null;\n  }\n\n  getExpressionTarget(expr: AST): Reference|Variable|null {\n    return this.exprTargets.get(expr) || null;\n  }\n\n  getTemplateOfSymbol(symbol: Reference|Variable): Template|null {\n    return this.symbols.get(symbol) || null;\n  }\n\n  getNestingLevel(template: Template): number {\n    return this.nestingLevel.get(template) || 0;\n  }\n\n  getUsedDirectives(): DirectiveT[] {\n    const set = new Set<DirectiveT>();\n    this.directives.forEach(dirs => dirs.forEach(dir => set.add(dir)));\n    return Array.from(set.values());\n  }\n\n  getUsedPipes(): string[] {\n    return Array.from(this.usedPipes);\n  }\n}\n\nfunction extractTemplateEntities(rootScope: Scope): Map<Template|null, Set<Reference|Variable>> {\n  const entityMap = new Map<Template|null, Map<string, Reference|Variable>>();\n\n  function extractScopeEntities(scope: Scope): Map<string, Reference|Variable> {\n    if (entityMap.has(scope.template)) {\n      return entityMap.get(scope.template)!;\n    }\n\n    const currentEntities = scope.namedEntities;\n\n    let templateEntities: Map<string, Reference|Variable>;\n    if (scope.parentScope !== null) {\n      templateEntities = new Map([...extractScopeEntities(scope.parentScope), ...currentEntities]);\n    } else {\n      templateEntities = new Map(currentEntities);\n    }\n\n    entityMap.set(scope.template, templateEntities);\n    return templateEntities;\n  }\n\n  const scopesToProcess: Scope[] = [rootScope];\n  while (scopesToProcess.length > 0) {\n    const scope = scopesToProcess.pop()!;\n    for (const childScope of scope.childScopes.values()) {\n      scopesToProcess.push(childScope);\n    }\n    extractScopeEntities(scope);\n  }\n\n  const templateEntities = new Map<Template|null, Set<Reference|Variable>>();\n  for (const [template, entities] of entityMap) {\n    templateEntities.set(template, new Set(entities.values()));\n  }\n  return templateEntities;\n}\n"]}