53 lines
1.7 KiB
TypeScript
53 lines
1.7 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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export function getOriginalSymbol(checker: ts.TypeChecker): (symbol: ts.Symbol) => ts.Symbol {
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return function(symbol: ts.Symbol) {
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return ts.SymbolFlags.Alias & symbol.flags ? checker.getAliasedSymbol(symbol) : symbol;
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};
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}
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export function isDefined<T>(value: T | undefined | null): value is T {
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return (value !== undefined) && (value !== null);
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}
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export function getNameText(name: ts.PropertyName | ts.BindingName): string {
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return ts.isIdentifier(name) || ts.isLiteralExpression(name) ? name.text : name.getText();
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}
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/**
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* Parse down the AST and capture all the nodes that satisfy the test.
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* @param node The start node.
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* @param test The function that tests whether a node should be included.
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* @returns a collection of nodes that satisfy the test.
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*/
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export function findAll<T>(node: ts.Node, test: (node: ts.Node) => node is ts.Node & T): T[] {
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const nodes: T[] = [];
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findAllVisitor(node);
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return nodes;
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function findAllVisitor(n: ts.Node) {
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if (test(n)) {
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nodes.push(n);
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} else {
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n.forEachChild(child => findAllVisitor(child));
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}
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}
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}
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/**
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* Does the given declaration have a name which is an identifier?
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* @param declaration The declaration to test.
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* @returns true if the declaration has an identifer for a name.
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*/
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export function hasNameIdentifier(declaration: ts.Declaration): declaration is ts.Declaration&
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{name: ts.Identifier} {
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return ts.isIdentifier((declaration as any).name);
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}
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