@angular/core
Version:
Angular - the core framework
120 lines • 17.7 kB
JavaScript
/**
* @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/migrations/renderer-to-renderer2/util", ["require", "exports", "typescript"], factory);
}
})(function (require, exports) {
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.findImportSpecifier = exports.findCoreImport = exports.findRendererReferences = void 0;
const ts = require("typescript");
/**
* Finds typed nodes (e.g. function parameters or class properties) that are referencing the old
* `Renderer`, as well as calls to the `Renderer` methods.
*/
function findRendererReferences(sourceFile, typeChecker, rendererImport) {
const typedNodes = new Set();
const methodCalls = new Set();
const forwardRefs = new Set();
const importSpecifier = findImportSpecifier(rendererImport.elements, 'Renderer');
const forwardRefImport = findCoreImport(sourceFile, 'forwardRef');
const forwardRefSpecifier = forwardRefImport ? findImportSpecifier(forwardRefImport.elements, 'forwardRef') : null;
ts.forEachChild(sourceFile, function visitNode(node) {
if ((ts.isParameter(node) || ts.isPropertyDeclaration(node)) &&
isReferenceToImport(typeChecker, node.name, importSpecifier)) {
typedNodes.add(node);
}
else if (ts.isAsExpression(node) && isReferenceToImport(typeChecker, node.type, importSpecifier)) {
typedNodes.add(node);
}
else if (ts.isCallExpression(node)) {
if (ts.isPropertyAccessExpression(node.expression) &&
isReferenceToImport(typeChecker, node.expression.expression, importSpecifier)) {
methodCalls.add(node);
}
else if (
// If we're dealing with a forwardRef that's returning a Renderer.
forwardRefSpecifier && ts.isIdentifier(node.expression) &&
isReferenceToImport(typeChecker, node.expression, forwardRefSpecifier) &&
node.arguments.length) {
const rendererIdentifier = findRendererIdentifierInForwardRef(typeChecker, node, importSpecifier);
if (rendererIdentifier) {
forwardRefs.add(rendererIdentifier);
}
}
}
ts.forEachChild(node, visitNode);
});
return { typedNodes, methodCalls, forwardRefs };
}
exports.findRendererReferences = findRendererReferences;
/** Finds the import from @angular/core that has a symbol with a particular name. */
function findCoreImport(sourceFile, symbolName) {
// Only look through the top-level imports.
for (const node of sourceFile.statements) {
if (!ts.isImportDeclaration(node) || !ts.isStringLiteral(node.moduleSpecifier) ||
node.moduleSpecifier.text !== '@angular/core') {
continue;
}
const namedBindings = node.importClause && node.importClause.namedBindings;
if (!namedBindings || !ts.isNamedImports(namedBindings)) {
continue;
}
if (findImportSpecifier(namedBindings.elements, symbolName)) {
return namedBindings;
}
}
return null;
}
exports.findCoreImport = findCoreImport;
/** Finds an import specifier with a particular name, accounting for aliases. */
function findImportSpecifier(elements, importName) {
return elements.find(element => {
const { name, propertyName } = element;
return propertyName ? propertyName.text === importName : name.text === importName;
}) ||
null;
}
exports.findImportSpecifier = findImportSpecifier;
/** Checks whether a node is referring to an import spcifier. */
function isReferenceToImport(typeChecker, node, importSpecifier) {
if (importSpecifier) {
const nodeSymbol = typeChecker.getTypeAtLocation(node).getSymbol();
const importSymbol = typeChecker.getTypeAtLocation(importSpecifier).getSymbol();
return !!(nodeSymbol && importSymbol) &&
nodeSymbol.valueDeclaration === importSymbol.valueDeclaration;
}
return false;
}
/** Finds the identifier referring to the `Renderer` inside a `forwardRef` call expression. */
function findRendererIdentifierInForwardRef(typeChecker, node, rendererImport) {
const firstArg = node.arguments[0];
if (ts.isArrowFunction(firstArg)) {
// Check if the function is `forwardRef(() => Renderer)`.
if (ts.isIdentifier(firstArg.body) &&
isReferenceToImport(typeChecker, firstArg.body, rendererImport)) {
return firstArg.body;
}
else if (ts.isBlock(firstArg.body) && ts.isReturnStatement(firstArg.body.statements[0])) {
// Otherwise check if the expression is `forwardRef(() => { return Renderer })`.
const returnStatement = firstArg.body.statements[0];
if (returnStatement.expression && ts.isIdentifier(returnStatement.expression) &&
isReferenceToImport(typeChecker, returnStatement.expression, rendererImport)) {
return returnStatement.expression;
}
}
}
return null;
}
});
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findImportSpecifier(forwardRefImport.elements, 'forwardRef') : null;\n\n  ts.forEachChild(sourceFile, function visitNode(node: ts.Node) {\n    if ((ts.isParameter(node) || ts.isPropertyDeclaration(node)) &&\n        isReferenceToImport(typeChecker, node.name, importSpecifier)) {\n      typedNodes.add(node);\n    } else if (\n        ts.isAsExpression(node) && isReferenceToImport(typeChecker, node.type, importSpecifier)) {\n      typedNodes.add(node);\n    } else if (ts.isCallExpression(node)) {\n      if (ts.isPropertyAccessExpression(node.expression) &&\n          isReferenceToImport(typeChecker, node.expression.expression, importSpecifier)) {\n        methodCalls.add(node);\n      } else if (\n          // If we're dealing with a forwardRef that's returning a Renderer.\n          forwardRefSpecifier && ts.isIdentifier(node.expression) &&\n          isReferenceToImport(typeChecker, node.expression, forwardRefSpecifier) &&\n          node.arguments.length) {\n        const rendererIdentifier =\n            findRendererIdentifierInForwardRef(typeChecker, node, importSpecifier);\n        if (rendererIdentifier) {\n          forwardRefs.add(rendererIdentifier);\n        }\n      }\n    }\n\n    ts.forEachChild(node, visitNode);\n  });\n\n  return {typedNodes, methodCalls, forwardRefs};\n}\n\n/** Finds the import from @angular/core that has a symbol with a particular name. */\nexport function findCoreImport(sourceFile: ts.SourceFile, symbolName: string): ts.NamedImports|\n    null {\n  // Only look through the top-level imports.\n  for (const node of sourceFile.statements) {\n    if (!ts.isImportDeclaration(node) || !ts.isStringLiteral(node.moduleSpecifier) ||\n        node.moduleSpecifier.text !== '@angular/core') {\n      continue;\n    }\n\n    const namedBindings = node.importClause && node.importClause.namedBindings;\n\n    if (!namedBindings || !ts.isNamedImports(namedBindings)) {\n      continue;\n    }\n\n    if (findImportSpecifier(namedBindings.elements, symbolName)) {\n      return namedBindings;\n    }\n  }\n\n  return null;\n}\n\n/** Finds an import specifier with a particular name, accounting for aliases. */\nexport function findImportSpecifier(\n    elements: ts.NodeArray<ts.ImportSpecifier>, importName: string) {\n  return elements.find(element => {\n    const {name, propertyName} = element;\n    return propertyName ? propertyName.text === importName : name.text === importName;\n  }) ||\n      null;\n}\n\n/** Checks whether a node is referring to an import spcifier. */\nfunction isReferenceToImport(\n    typeChecker: ts.TypeChecker, node: ts.Node, importSpecifier: ts.ImportSpecifier|null): boolean {\n  if (importSpecifier) {\n    const nodeSymbol = typeChecker.getTypeAtLocation(node).getSymbol();\n    const importSymbol = typeChecker.getTypeAtLocation(importSpecifier).getSymbol();\n    return !!(nodeSymbol && importSymbol) &&\n        nodeSymbol.valueDeclaration === importSymbol.valueDeclaration;\n  }\n  return false;\n}\n\n/** Finds the identifier referring to the `Renderer` inside a `forwardRef` call expression. */\nfunction findRendererIdentifierInForwardRef(\n    typeChecker: ts.TypeChecker, node: ts.CallExpression,\n    rendererImport: ts.ImportSpecifier|null): ts.Identifier|null {\n  const firstArg = node.arguments[0];\n\n  if (ts.isArrowFunction(firstArg)) {\n    // Check if the function is `forwardRef(() => Renderer)`.\n    if (ts.isIdentifier(firstArg.body) &&\n        isReferenceToImport(typeChecker, firstArg.body, rendererImport)) {\n      return firstArg.body;\n    } else if (ts.isBlock(firstArg.body) && ts.isReturnStatement(firstArg.body.statements[0])) {\n      // Otherwise check if the expression is `forwardRef(() => { return Renderer })`.\n      const returnStatement = firstArg.body.statements[0] as ts.ReturnStatement;\n\n      if (returnStatement.expression && ts.isIdentifier(returnStatement.expression) &&\n          isReferenceToImport(typeChecker, returnStatement.expression, rendererImport)) {\n        return returnStatement.expression;\n      }\n    }\n  }\n\n  return null;\n}\n"]}