17d5e2bc99
While different, CommonJS and UMD have a lot in common regarding the their exports are constructed. Therefore, there was some code duplication between `CommonJsReflectionHost` and `UmdReflectionHost`. This commit extracts some of the common bits into a separate file as helpers to allow reusing the code in both `ReflectionHost`s. PR Close #34512
86 lines
3.3 KiB
TypeScript
86 lines
3.3 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import * as ts from 'typescript';
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import {Declaration} from '../../../src/ngtsc/reflection';
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export interface ExportDeclaration {
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name: string;
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declaration: Declaration;
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}
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export interface ExportStatement extends ts.ExpressionStatement {
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expression: ts.BinaryExpression&{left: ts.PropertyAccessExpression & {expression: ts.Identifier}};
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}
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export interface ReexportStatement extends ts.ExpressionStatement { expression: ts.CallExpression; }
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export interface RequireCall extends ts.CallExpression {
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arguments: ts.CallExpression['arguments']&[ts.StringLiteral];
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}
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/**
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* Return the "namespace" of the specified `ts.Identifier` if the identifier is the RHS of a
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* property access expression, i.e. an expression of the form `<namespace>.<id>` (in which case a
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* `ts.Identifier` corresponding to `<namespace>` will be returned). Otherwise return `null`.
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*/
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export function findNamespaceOfIdentifier(id: ts.Identifier): ts.Identifier|null {
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return id.parent && ts.isPropertyAccessExpression(id.parent) &&
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ts.isIdentifier(id.parent.expression) ?
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id.parent.expression :
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null;
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}
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/**
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* Return the `RequireCall` that is used to initialize the specified `ts.Identifier`, if the
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* specified indentifier was indeed initialized with a require call in a declaration of the form:
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* `var <id> = require('...')`
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*/
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export function findRequireCallReference(id: ts.Identifier, checker: ts.TypeChecker): RequireCall|
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null {
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const symbol = checker.getSymbolAtLocation(id) || null;
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const declaration = symbol && symbol.valueDeclaration;
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const initializer =
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declaration && ts.isVariableDeclaration(declaration) && declaration.initializer || null;
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return initializer && isRequireCall(initializer) ? initializer : null;
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}
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/**
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* Check whether the specified `ts.Statement` is an export statement, i.e. an expression statement
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* of the form: `export.<foo> = <bar>`
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*/
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export function isExportStatement(stmt: ts.Statement): stmt is ExportStatement {
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return ts.isExpressionStatement(stmt) && ts.isBinaryExpression(stmt.expression) &&
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(stmt.expression.operatorToken.kind === ts.SyntaxKind.EqualsToken) &&
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ts.isPropertyAccessExpression(stmt.expression.left) &&
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ts.isIdentifier(stmt.expression.left.expression) &&
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stmt.expression.left.expression.text === 'exports';
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}
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/**
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* Check whether the specified `ts.Statement` is a re-export statement, i.e. an expression statement
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* of the form: `__export(<foo>)`
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*/
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export function isReexportStatement(stmt: ts.Statement): stmt is ReexportStatement {
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return ts.isExpressionStatement(stmt) && ts.isCallExpression(stmt.expression) &&
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ts.isIdentifier(stmt.expression.expression) &&
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stmt.expression.expression.text === '__export' && stmt.expression.arguments.length === 1;
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}
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/**
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* Check whether the specified `ts.Node` represents a `require()` call, i.e. an call expression of
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* the form: `require('<foo>')`
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*/
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export function isRequireCall(node: ts.Node): node is RequireCall {
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return ts.isCallExpression(node) && ts.isIdentifier(node.expression) &&
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node.expression.text === 'require' && node.arguments.length === 1 &&
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ts.isStringLiteral(node.arguments[0]);
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}
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