134 lines
4.3 KiB
TypeScript
134 lines
4.3 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 fs from 'fs';
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import * as ts from 'typescript';
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export interface Symbol { name: string; }
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export class SymbolExtractor {
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public actual: Symbol[];
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static symbolSort(a: Symbol, b: Symbol): number {
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return a.name == b.name ? 0 : a.name < b.name ? -1 : 1;
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}
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static parse(path: string, contents: string): Symbol[] {
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const symbols: Symbol[] = [];
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const source: ts.SourceFile = ts.createSourceFile(path, contents, ts.ScriptTarget.Latest, true);
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let fnRecurseDepth = 0;
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function visitor(child: ts.Node) {
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// Left for easier debugging.
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// console.log('>>>', ts.SyntaxKind[child.kind]);
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switch (child.kind) {
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case ts.SyntaxKind.FunctionExpression:
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fnRecurseDepth++;
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if (fnRecurseDepth <= 1) {
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ts.forEachChild(child, visitor);
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}
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fnRecurseDepth--;
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break;
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case ts.SyntaxKind.SourceFile:
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case ts.SyntaxKind.VariableStatement:
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case ts.SyntaxKind.VariableDeclarationList:
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case ts.SyntaxKind.ExpressionStatement:
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case ts.SyntaxKind.CallExpression:
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case ts.SyntaxKind.ParenthesizedExpression:
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case ts.SyntaxKind.Block:
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case ts.SyntaxKind.PrefixUnaryExpression:
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ts.forEachChild(child, visitor);
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break;
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case ts.SyntaxKind.VariableDeclaration:
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const varDecl = child as ts.VariableDeclaration;
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if (varDecl.initializer && fnRecurseDepth !== 0) {
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symbols.push({name: varDecl.name.getText()});
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}
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if (fnRecurseDepth == 0 &&
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isRollupExportSymbol(child.parent as ts.VariableDeclarationList)) {
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ts.forEachChild(child, visitor);
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}
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break;
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case ts.SyntaxKind.FunctionDeclaration:
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const funcDecl = child as ts.FunctionDeclaration;
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funcDecl.name && symbols.push({name: funcDecl.name.getText()});
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break;
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default:
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// Left for easier debugging.
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// console.log('###', ts.SyntaxKind[child.kind], child.getText());
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}
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if (symbols.length && symbols[symbols.length - 1].name == 'type') {
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debugger;
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}
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}
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visitor(source);
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symbols.sort(SymbolExtractor.symbolSort);
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return symbols;
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}
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static diff(actual: Symbol[], expected: string|((Symbol | string)[])): {[name: string]: string} {
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if (typeof expected == 'string') {
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expected = JSON.parse(expected);
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}
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const diff: {[name: string]: ('missing' | 'extra')} = {};
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(expected as(Symbol | string)[]).forEach((nameOrSymbol) => {
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diff[typeof nameOrSymbol == 'string' ? nameOrSymbol : nameOrSymbol.name] = 'missing';
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});
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actual.forEach((s) => {
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if (diff[s.name] === 'missing') {
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delete diff[s.name];
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} else {
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diff[s.name] = 'extra';
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}
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});
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return diff;
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}
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constructor(private path: string, private contents: string) {
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this.actual = SymbolExtractor.parse(path, contents);
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}
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expect(expectedSymbols: (string|Symbol)[]) {
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expect(SymbolExtractor.diff(this.actual, expectedSymbols)).toEqual({});
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}
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compareAndPrintError(goldenFilePath: string, expected: string|((Symbol | string)[])): boolean {
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let passed = true;
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const diff = SymbolExtractor.diff(this.actual, expected);
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Object.keys(diff).forEach((key) => {
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if (passed) {
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console.error(`Expected symbols in '${this.path}' did not match gold file.`);
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passed = false;
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}
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console.error(` Symbol: ${key} => ${diff[key]}`);
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});
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return passed;
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}
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}
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function toSymbol(v: string | Symbol): Symbol {
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return typeof v == 'string' ? {'name': v} : v as Symbol;
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}
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function toName(symbol: Symbol): string {
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return symbol.name;
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}
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/**
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* Detects if VariableDeclarationList is format `var x = function(){}()`;
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*
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* Rollup produces this format when it wants to export symbols from a bundle.
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* @param child
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*/
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function isRollupExportSymbol(child: ts.VariableDeclarationList): boolean {
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if (child.declarations.length !== 1) return false;
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const decl: ts.VariableDeclaration = child.declarations[0];
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return !!(decl.initializer && decl.initializer.kind == ts.SyntaxKind.CallExpression);
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} |