blob: 9a457f308f537b6f5fb207862d2d70a71af290ef [file] [log] [blame]
/**
* @license
* Copyright Google Inc. 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/migrations/static-queries/strategies/usage_strategy/usage_strategy", ["require", "exports", "typescript", "@angular/core/schematics/utils/parse_html", "@angular/core/schematics/utils/typescript/property_name", "@angular/core/schematics/migrations/static-queries/angular/query-definition", "@angular/core/schematics/migrations/static-queries/strategies/usage_strategy/declaration_usage_visitor", "@angular/core/schematics/migrations/static-queries/strategies/usage_strategy/super_class_context", "@angular/core/schematics/migrations/static-queries/strategies/usage_strategy/template_usage_visitor"], factory);
}
})(function (require, exports) {
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const ts = require("typescript");
const parse_html_1 = require("@angular/core/schematics/utils/parse_html");
const property_name_1 = require("@angular/core/schematics/utils/typescript/property_name");
const query_definition_1 = require("@angular/core/schematics/migrations/static-queries/angular/query-definition");
const declaration_usage_visitor_1 = require("@angular/core/schematics/migrations/static-queries/strategies/usage_strategy/declaration_usage_visitor");
const super_class_context_1 = require("@angular/core/schematics/migrations/static-queries/strategies/usage_strategy/super_class_context");
const template_usage_visitor_1 = require("@angular/core/schematics/migrations/static-queries/strategies/usage_strategy/template_usage_visitor");
/**
* Object that maps a given type of query to a list of lifecycle hooks that
* could be used to access such a query statically.
*/
const STATIC_QUERY_LIFECYCLE_HOOKS = {
[query_definition_1.QueryType.ViewChild]: ['ngOnChanges', 'ngOnInit', 'ngDoCheck', 'ngAfterContentInit', 'ngAfterContentChecked'],
[query_definition_1.QueryType.ContentChild]: ['ngOnChanges', 'ngOnInit', 'ngDoCheck'],
};
/**
* Query timing strategy that determines the timing of a given query by inspecting how
* the query is accessed within the project's TypeScript source files. Read more about
* this strategy here: https://hackmd.io/s/Hymvc2OKE
*/
class QueryUsageStrategy {
constructor(classMetadata, typeChecker) {
this.classMetadata = classMetadata;
this.typeChecker = typeChecker;
}
setup() { }
/**
* Analyzes the usage of the given query and determines the query timing based
* on the current usage of the query.
*/
detectTiming(query) {
if (query.property === null) {
return { timing: null, message: 'Queries defined on accessors cannot be analyzed.' };
}
const usage = this.analyzeQueryUsage(query.container, query, []);
if (usage === declaration_usage_visitor_1.ResolvedUsage.AMBIGUOUS) {
return {
timing: query_definition_1.QueryTiming.STATIC,
message: 'Query timing is ambiguous. Please check if the query can be marked as dynamic.'
};
}
else if (usage === declaration_usage_visitor_1.ResolvedUsage.SYNCHRONOUS) {
return { timing: query_definition_1.QueryTiming.STATIC };
}
else {
return { timing: query_definition_1.QueryTiming.DYNAMIC };
}
}
/**
* Checks whether a given query is used statically within the given class, its super
* class or derived classes.
*/
analyzeQueryUsage(classDecl, query, knownInputNames, functionCtx = new Map(), visitInheritedClasses = true) {
const usageVisitor = new declaration_usage_visitor_1.DeclarationUsageVisitor(query.property, this.typeChecker, functionCtx);
const classMetadata = this.classMetadata.get(classDecl);
let usage = declaration_usage_visitor_1.ResolvedUsage.ASYNCHRONOUS;
// In case there is metadata for the current class, we collect all resolved Angular input
// names and add them to the list of known inputs that need to be checked for usages of
// the current query. e.g. queries used in an @Input() *setter* are always static.
if (classMetadata) {
knownInputNames.push(...classMetadata.ngInputNames);
}
// Array of TypeScript nodes which can contain usages of the given query in
// order to access it statically.
const possibleStaticQueryNodes = filterQueryClassMemberNodes(classDecl, query, knownInputNames);
// In case nodes that can possibly access a query statically have been found, check
// if the query declaration is synchronously used within any of these nodes.
if (possibleStaticQueryNodes.length) {
possibleStaticQueryNodes.forEach(n => usage = combineResolvedUsage(usage, usageVisitor.getResolvedNodeUsage(n)));
}
if (!classMetadata) {
return usage;
}
// In case there is a component template for the current class, we check if the
// template statically accesses the current query. In case that's true, the query
// can be marked as static.
if (classMetadata.template && property_name_1.hasPropertyNameText(query.property.name)) {
const template = classMetadata.template;
const parsedHtml = parse_html_1.parseHtmlGracefully(template.content, template.filePath);
const htmlVisitor = new template_usage_visitor_1.TemplateUsageVisitor(query.property.name.text);
if (parsedHtml && htmlVisitor.isQueryUsedStatically(parsedHtml)) {
return declaration_usage_visitor_1.ResolvedUsage.SYNCHRONOUS;
}
}
// In case derived classes should also be analyzed, we determine the classes that derive
// from the current class and check if these have input setters or lifecycle hooks that
// use the query statically.
if (visitInheritedClasses) {
classMetadata.derivedClasses.forEach(derivedClass => {
usage = combineResolvedUsage(usage, this.analyzeQueryUsage(derivedClass, query, knownInputNames));
});
}
// In case the current class has a super class, we determine declared abstract function-like
// declarations in the super-class that are implemented in the current class. The super class
// will then be analyzed with the abstract declarations mapped to the implemented TypeScript
// nodes. This allows us to handle queries which are used in super classes through derived
// abstract method declarations.
if (classMetadata.superClass) {
const superClassDecl = classMetadata.superClass;
// Update the function context to map abstract declaration nodes to their implementation
// node in the base class. This ensures that the declaration usage visitor can analyze
// abstract class member declarations.
super_class_context_1.updateSuperClassAbstractMembersContext(classDecl, functionCtx, this.classMetadata);
usage = combineResolvedUsage(usage, this.analyzeQueryUsage(superClassDecl, query, [], functionCtx, false));
}
return usage;
}
}
exports.QueryUsageStrategy = QueryUsageStrategy;
/**
* Combines two resolved usages based on a fixed priority. "Synchronous" takes
* precedence over "Ambiguous" whereas ambiguous takes precedence over "Asynchronous".
*/
function combineResolvedUsage(base, target) {
if (base === declaration_usage_visitor_1.ResolvedUsage.SYNCHRONOUS) {
return base;
}
else if (target !== declaration_usage_visitor_1.ResolvedUsage.ASYNCHRONOUS) {
return target;
}
else {
return declaration_usage_visitor_1.ResolvedUsage.ASYNCHRONOUS;
}
}
/**
* Filters all class members from the class declaration that can access the
* given query statically (e.g. ngOnInit lifecycle hook or @Input setters)
*/
function filterQueryClassMemberNodes(classDecl, query, knownInputNames) {
// Returns an array of TypeScript nodes which can contain usages of the given query
// in order to access it statically. e.g.
// (1) queries used in the "ngOnInit" lifecycle hook are static.
// (2) inputs with setters can access queries statically.
return classDecl.members
.filter(m => {
if (ts.isMethodDeclaration(m) && m.body && property_name_1.hasPropertyNameText(m.name) &&
STATIC_QUERY_LIFECYCLE_HOOKS[query.type].indexOf(m.name.text) !== -1) {
return true;
}
else if (knownInputNames && ts.isSetAccessor(m) && m.body && property_name_1.hasPropertyNameText(m.name) &&
knownInputNames.indexOf(m.name.text) !== -1) {
return true;
}
return false;
})
.map((member) => member.body);
}
});
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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 * as ts from 'typescript';\n\nimport {parseHtmlGracefully} from '../../../../utils/parse_html';\nimport {hasPropertyNameText} from '../../../../utils/typescript/property_name';\nimport {ClassMetadataMap} from '../../angular/ng_query_visitor';\nimport {NgQueryDefinition, QueryTiming, QueryType} from '../../angular/query-definition';\nimport {TimingResult, TimingStrategy} from '../timing-strategy';\n\nimport {DeclarationUsageVisitor, FunctionContext, ResolvedUsage} from './declaration_usage_visitor';\nimport {updateSuperClassAbstractMembersContext} from './super_class_context';\nimport {TemplateUsageVisitor} from './template_usage_visitor';\n\n\n/**\n * Object that maps a given type of query to a list of lifecycle hooks that\n * could be used to access such a query statically.\n */\nconst STATIC_QUERY_LIFECYCLE_HOOKS = {\n  [QueryType.ViewChild]:\n      ['ngOnChanges', 'ngOnInit', 'ngDoCheck', 'ngAfterContentInit', 'ngAfterContentChecked'],\n  [QueryType.ContentChild]: ['ngOnChanges', 'ngOnInit', 'ngDoCheck'],\n};\n\n/**\n * Query timing strategy that determines the timing of a given query by inspecting how\n * the query is accessed within the project's TypeScript source files. Read more about\n * this strategy here: https://hackmd.io/s/Hymvc2OKE\n */\nexport class QueryUsageStrategy implements TimingStrategy {\n  constructor(private classMetadata: ClassMetadataMap, private typeChecker: ts.TypeChecker) {}\n\n  setup() {}\n\n  /**\n   * Analyzes the usage of the given query and determines the query timing based\n   * on the current usage of the query.\n   */\n  detectTiming(query: NgQueryDefinition): TimingResult {\n    if (query.property === null) {\n      return {timing: null, message: 'Queries defined on accessors cannot be analyzed.'};\n    }\n\n    const usage = this.analyzeQueryUsage(query.container, query, []);\n\n    if (usage === ResolvedUsage.AMBIGUOUS) {\n      return {\n        timing: QueryTiming.STATIC,\n        message: 'Query timing is ambiguous. Please check if the query can be marked as dynamic.'\n      };\n    } else if (usage === ResolvedUsage.SYNCHRONOUS) {\n      return {timing: QueryTiming.STATIC};\n    } else {\n      return {timing: QueryTiming.DYNAMIC};\n    }\n  }\n\n  /**\n   * Checks whether a given query is used statically within the given class, its super\n   * class or derived classes.\n   */\n  private analyzeQueryUsage(\n      classDecl: ts.ClassDeclaration, query: NgQueryDefinition, knownInputNames: string[],\n      functionCtx: FunctionContext = new Map(), visitInheritedClasses = true): ResolvedUsage {\n    const usageVisitor =\n        new DeclarationUsageVisitor(query.property !, this.typeChecker, functionCtx);\n    const classMetadata = this.classMetadata.get(classDecl);\n    let usage: ResolvedUsage = ResolvedUsage.ASYNCHRONOUS;\n\n    // In case there is metadata for the current class, we collect all resolved Angular input\n    // names and add them to the list of known inputs that need to be checked for usages of\n    // the current query. e.g. queries used in an @Input() *setter* are always static.\n    if (classMetadata) {\n      knownInputNames.push(...classMetadata.ngInputNames);\n    }\n\n    // Array of TypeScript nodes which can contain usages of the given query in\n    // order to access it statically.\n    const possibleStaticQueryNodes = filterQueryClassMemberNodes(classDecl, query, knownInputNames);\n\n    // In case nodes that can possibly access a query statically have been found, check\n    // if the query declaration is synchronously used within any of these nodes.\n    if (possibleStaticQueryNodes.length) {\n      possibleStaticQueryNodes.forEach(\n          n => usage = combineResolvedUsage(usage, usageVisitor.getResolvedNodeUsage(n)));\n    }\n\n    if (!classMetadata) {\n      return usage;\n    }\n\n    // In case there is a component template for the current class, we check if the\n    // template statically accesses the current query. In case that's true, the query\n    // can be marked as static.\n    if (classMetadata.template && hasPropertyNameText(query.property !.name)) {\n      const template = classMetadata.template;\n      const parsedHtml = parseHtmlGracefully(template.content, template.filePath);\n      const htmlVisitor = new TemplateUsageVisitor(query.property !.name.text);\n\n      if (parsedHtml && htmlVisitor.isQueryUsedStatically(parsedHtml)) {\n        return ResolvedUsage.SYNCHRONOUS;\n      }\n    }\n\n    // In case derived classes should also be analyzed, we determine the classes that derive\n    // from the current class and check if these have input setters or lifecycle hooks that\n    // use the query statically.\n    if (visitInheritedClasses) {\n      classMetadata.derivedClasses.forEach(derivedClass => {\n        usage = combineResolvedUsage(\n            usage, this.analyzeQueryUsage(derivedClass, query, knownInputNames));\n      });\n    }\n\n    // In case the current class has a super class, we determine declared abstract function-like\n    // declarations in the super-class that are implemented in the current class. The super class\n    // will then be analyzed with the abstract declarations mapped to the implemented TypeScript\n    // nodes. This allows us to handle queries which are used in super classes through derived\n    // abstract method declarations.\n    if (classMetadata.superClass) {\n      const superClassDecl = classMetadata.superClass;\n\n      // Update the function context to map abstract declaration nodes to their implementation\n      // node in the base class. This ensures that the declaration usage visitor can analyze\n      // abstract class member declarations.\n      updateSuperClassAbstractMembersContext(classDecl, functionCtx, this.classMetadata);\n\n      usage = combineResolvedUsage(\n          usage, this.analyzeQueryUsage(superClassDecl, query, [], functionCtx, false));\n    }\n\n    return usage;\n  }\n}\n\n/**\n * Combines two resolved usages based on a fixed priority. \"Synchronous\" takes\n * precedence over \"Ambiguous\" whereas ambiguous takes precedence over \"Asynchronous\".\n */\nfunction combineResolvedUsage(base: ResolvedUsage, target: ResolvedUsage): ResolvedUsage {\n  if (base === ResolvedUsage.SYNCHRONOUS) {\n    return base;\n  } else if (target !== ResolvedUsage.ASYNCHRONOUS) {\n    return target;\n  } else {\n    return ResolvedUsage.ASYNCHRONOUS;\n  }\n}\n\n/**\n * Filters all class members from the class declaration that can access the\n * given query statically (e.g. ngOnInit lifecycle hook or @Input setters)\n */\nfunction filterQueryClassMemberNodes(\n    classDecl: ts.ClassDeclaration, query: NgQueryDefinition,\n    knownInputNames: string[]): ts.Block[] {\n  // Returns an array of TypeScript nodes which can contain usages of the given query\n  // in order to access it statically. e.g.\n  //  (1) queries used in the \"ngOnInit\" lifecycle hook are static.\n  //  (2) inputs with setters can access queries statically.\n  return classDecl.members\n      .filter(m => {\n        if (ts.isMethodDeclaration(m) && m.body && hasPropertyNameText(m.name) &&\n            STATIC_QUERY_LIFECYCLE_HOOKS[query.type].indexOf(m.name.text) !== -1) {\n          return true;\n        } else if (\n            knownInputNames && ts.isSetAccessor(m) && m.body && hasPropertyNameText(m.name) &&\n            knownInputNames.indexOf(m.name.text) !== -1) {\n          return true;\n        }\n        return false;\n      })\n      .map((member: ts.SetAccessorDeclaration | ts.MethodDeclaration) => member.body !);\n}\n"]}