Ahmed Ashour
f1ded6af56
Fixes #47092 TEST=existing Change-Id: I3c5c0a1ec5e0426642a5dc70aa9a0391a143ed93 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/212298 Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Johnni Winther <johnniwinther@google.com>
89 lines
2.9 KiB
Dart
89 lines
2.9 KiB
Dart
// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import 'dart:collection';
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import 'package:analyzer/file_system/file_system.dart';
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import 'package:yaml/yaml.dart';
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/// Given a package map, check in each package's lib directory for the existence
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/// of an `_embedder.yaml` file. If the file contains a top level YamlMap, it
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/// will be added to the [embedderYamls] map.
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class EmbedderYamlLocator {
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/// The name of the embedder files being searched for.
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static const String EMBEDDER_FILE_NAME = '_embedder.yaml';
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/// A mapping from a package's library directory to the parsed YamlMap.
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final Map<Folder, YamlMap> embedderYamls = HashMap<Folder, YamlMap>();
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/// Initialize a newly created locator by processing the packages in the given
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/// [packageMap].
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EmbedderYamlLocator(Map<String, List<Folder>>? packageMap) {
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if (packageMap != null) {
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_processPackageMap(packageMap);
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}
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}
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/// Initialize with the given [libFolder] of `sky_engine` package.
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EmbedderYamlLocator.forLibFolder(Folder libFolder) {
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_processPackage([libFolder]);
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}
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/// Programmatically add an `_embedder.yaml` mapping.
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void addEmbedderYaml(Folder libDir, String embedderYaml) {
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_processEmbedderYaml(libDir, embedderYaml);
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}
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/// Refresh the map of located files to those found by processing the given
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/// [packageMap].
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void refresh(Map<String, List<Folder>>? packageMap) {
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// Clear existing.
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embedderYamls.clear();
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if (packageMap != null) {
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_processPackageMap(packageMap);
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}
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}
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/// Given the yaml for an embedder ([embedderYaml]) and a folder ([libDir]),
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/// setup the uri mapping.
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void _processEmbedderYaml(Folder libDir, String embedderYaml) {
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try {
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YamlNode yaml = loadYaml(embedderYaml);
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if (yaml is YamlMap) {
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embedderYamls[libDir] = yaml;
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}
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} catch (_) {
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// Ignored
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}
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}
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/// Given a package list of folders ([libDirs]), process any
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/// `_embedder.yaml` files that are found in any of the folders.
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void _processPackage(List<Folder> libDirs) {
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for (Folder libDir in libDirs) {
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String? embedderYaml = _readEmbedderYaml(libDir);
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if (embedderYaml != null) {
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_processEmbedderYaml(libDir, embedderYaml);
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}
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}
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}
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/// Process each of the entries in the [packageMap].
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void _processPackageMap(Map<String, List<Folder>> packageMap) {
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packageMap.values.forEach(_processPackage);
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}
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/// Read and return the contents of [libDir]/[EMBEDDER_FILE_NAME], or `null`
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/// if the file doesn't exist.
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String? _readEmbedderYaml(Folder libDir) {
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var file = libDir.getChildAssumingFile(EMBEDDER_FILE_NAME);
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try {
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return file.readAsStringSync();
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} on FileSystemException {
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// File can't be read.
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return null;
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}
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}
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}
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