@angular-devkit/core
Version:
Angular DevKit - Core Utility Library
314 lines • 43.2 kB
JavaScript
"use strict";
/**
* @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
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.CordHost = void 0;
const rxjs_1 = require("rxjs");
const exception_1 = require("../../exception");
const memory_1 = require("./memory");
/**
* A Host that records changes to the underlying Host, while keeping a record of Create, Overwrite,
* Rename and Delete of files.
*
* This is fully compatible with Host, but will keep a staging of every changes asked. That staging
* follows the principle of the Tree (e.g. can create a file that already exists).
*
* Using `create()` and `overwrite()` will force those operations, but using `write` will add
* the create/overwrite records IIF the files does/doesn't already exist.
*/
class CordHost extends memory_1.SimpleMemoryHost {
constructor(_back) {
super();
this._back = _back;
this._filesToCreate = new Set();
this._filesToRename = new Map();
this._filesToRenameRevert = new Map();
this._filesToDelete = new Set();
this._filesToOverwrite = new Set();
}
get backend() {
return this._back;
}
get capabilities() {
// Our own host is always Synchronous, but the backend might not be.
return {
synchronous: this._back.capabilities.synchronous,
};
}
/**
* Create a copy of this host, including all actions made.
* @returns {CordHost} The carbon copy.
*/
clone() {
const dolly = new CordHost(this._back);
dolly._cache = new Map(this._cache);
dolly._filesToCreate = new Set(this._filesToCreate);
dolly._filesToRename = new Map(this._filesToRename);
dolly._filesToRenameRevert = new Map(this._filesToRenameRevert);
dolly._filesToDelete = new Set(this._filesToDelete);
dolly._filesToOverwrite = new Set(this._filesToOverwrite);
return dolly;
}
/**
* Commit the changes recorded to a Host. It is assumed that the host does have the same structure
* as the host that was used for backend (could be the same host).
* @param host The host to create/delete/rename/overwrite files to.
* @param force Whether to skip existence checks when creating/overwriting. This is
* faster but might lead to incorrect states. Because Hosts natively don't support creation
* versus overwriting (it's only writing), we check for existence before completing a request.
* @returns An observable that completes when done, or error if an error occured.
*/
commit(host, force = false) {
// Really commit everything to the actual host.
return (0, rxjs_1.from)(this.records()).pipe((0, rxjs_1.concatMap)((record) => {
switch (record.kind) {
case 'delete':
return host.delete(record.path);
case 'rename':
return host.rename(record.from, record.to);
case 'create':
return host.exists(record.path).pipe((0, rxjs_1.switchMap)((exists) => {
if (exists && !force) {
return (0, rxjs_1.throwError)(new exception_1.FileAlreadyExistException(record.path));
}
else {
return host.write(record.path, record.content);
}
}));
case 'overwrite':
return host.exists(record.path).pipe((0, rxjs_1.switchMap)((exists) => {
if (!exists && !force) {
return (0, rxjs_1.throwError)(new exception_1.FileDoesNotExistException(record.path));
}
else {
return host.write(record.path, record.content);
}
}));
}
}), (0, rxjs_1.reduce)(() => { }));
}
records() {
return [
...[...this._filesToDelete.values()].map((path) => ({
kind: 'delete',
path,
})),
...[...this._filesToRename.entries()].map(([from, to]) => ({
kind: 'rename',
from,
to,
})),
...[...this._filesToCreate.values()].map((path) => ({
kind: 'create',
path,
content: this._read(path),
})),
...[...this._filesToOverwrite.values()].map((path) => ({
kind: 'overwrite',
path,
content: this._read(path),
})),
];
}
/**
* Specialized version of {@link CordHost#write} which forces the creation of a file whether it
* exists or not.
* @param {} path
* @param {FileBuffer} content
* @returns {Observable<void>}
*/
create(path, content) {
if (super._exists(path)) {
throw new exception_1.FileAlreadyExistException(path);
}
if (this._filesToDelete.has(path)) {
this._filesToDelete.delete(path);
this._filesToOverwrite.add(path);
}
else {
this._filesToCreate.add(path);
}
return super.write(path, content);
}
overwrite(path, content) {
return this.isDirectory(path).pipe((0, rxjs_1.switchMap)((isDir) => {
if (isDir) {
return (0, rxjs_1.throwError)(new exception_1.PathIsDirectoryException(path));
}
return this.exists(path);
}), (0, rxjs_1.switchMap)((exists) => {
if (!exists) {
return (0, rxjs_1.throwError)(new exception_1.FileDoesNotExistException(path));
}
if (!this._filesToCreate.has(path)) {
this._filesToOverwrite.add(path);
}
return super.write(path, content);
}));
}
write(path, content) {
return this.exists(path).pipe((0, rxjs_1.switchMap)((exists) => {
if (exists) {
// It exists, but might be being renamed or deleted. In that case we want to create it.
if (this.willRename(path) || this.willDelete(path)) {
return this.create(path, content);
}
else {
return this.overwrite(path, content);
}
}
else {
return this.create(path, content);
}
}));
}
read(path) {
if (this._exists(path)) {
return super.read(path);
}
return this._back.read(path);
}
delete(path) {
if (this._exists(path)) {
if (this._filesToCreate.has(path)) {
this._filesToCreate.delete(path);
}
else if (this._filesToOverwrite.has(path)) {
this._filesToOverwrite.delete(path);
this._filesToDelete.add(path);
}
else {
const maybeOrigin = this._filesToRenameRevert.get(path);
if (maybeOrigin) {
this._filesToRenameRevert.delete(path);
this._filesToRename.delete(maybeOrigin);
this._filesToDelete.add(maybeOrigin);
}
else {
return (0, rxjs_1.throwError)(new exception_1.UnknownException(`This should never happen. Path: ${JSON.stringify(path)}.`));
}
}
return super.delete(path);
}
else {
return this._back.exists(path).pipe((0, rxjs_1.switchMap)((exists) => {
if (exists) {
this._filesToDelete.add(path);
return (0, rxjs_1.of)();
}
else {
return (0, rxjs_1.throwError)(new exception_1.FileDoesNotExistException(path));
}
}));
}
}
rename(from, to) {
return (0, rxjs_1.concat)(this.exists(to), this.exists(from)).pipe((0, rxjs_1.toArray)(), (0, rxjs_1.switchMap)(([existTo, existFrom]) => {
if (!existFrom) {
return (0, rxjs_1.throwError)(new exception_1.FileDoesNotExistException(from));
}
if (from === to) {
return rxjs_1.EMPTY;
}
if (existTo) {
return (0, rxjs_1.throwError)(new exception_1.FileAlreadyExistException(to));
}
// If we're renaming a file that's been created, shortcircuit to creating the `to` path.
if (this._filesToCreate.has(from)) {
this._filesToCreate.delete(from);
this._filesToCreate.add(to);
return super.rename(from, to);
}
if (this._filesToOverwrite.has(from)) {
this._filesToOverwrite.delete(from);
// Recursively call this function. This is so we don't repeat the bottom logic. This
// if will be by-passed because we just deleted the `from` path from files to overwrite.
return (0, rxjs_1.concat)(this.rename(from, to), new rxjs_1.Observable((x) => {
this._filesToOverwrite.add(to);
x.complete();
}));
}
if (this._filesToDelete.has(to)) {
this._filesToDelete.delete(to);
this._filesToDelete.add(from);
this._filesToOverwrite.add(to);
// We need to delete the original and write the new one.
return this.read(from).pipe((0, rxjs_1.map)((content) => this._write(to, content)));
}
const maybeTo1 = this._filesToRenameRevert.get(from);
if (maybeTo1) {
// We already renamed to this file (A => from), let's rename the former to the new
// path (A => to).
this._filesToRename.delete(maybeTo1);
this._filesToRenameRevert.delete(from);
from = maybeTo1;
}
this._filesToRename.set(from, to);
this._filesToRenameRevert.set(to, from);
// If the file is part of our data, just rename it internally.
if (this._exists(from)) {
return super.rename(from, to);
}
else {
// Create a file with the same content.
return this._back.read(from).pipe((0, rxjs_1.switchMap)((content) => super.write(to, content)));
}
}));
}
list(path) {
return (0, rxjs_1.concat)(super.list(path), this._back.list(path)).pipe((0, rxjs_1.reduce)((list, curr) => {
curr.forEach((elem) => list.add(elem));
return list;
}, new Set()), (0, rxjs_1.map)((set) => [...set]));
}
exists(path) {
return this._exists(path)
? (0, rxjs_1.of)(true)
: this.willDelete(path) || this.willRename(path)
? (0, rxjs_1.of)(false)
: this._back.exists(path);
}
isDirectory(path) {
return this._exists(path) ? super.isDirectory(path) : this._back.isDirectory(path);
}
isFile(path) {
return this._exists(path)
? super.isFile(path)
: this.willDelete(path) || this.willRename(path)
? (0, rxjs_1.of)(false)
: this._back.isFile(path);
}
stat(path) {
return this._exists(path)
? super.stat(path)
: this.willDelete(path) || this.willRename(path)
? (0, rxjs_1.of)(null)
: this._back.stat(path);
}
watch(path, options) {
// Watching not supported.
return null;
}
willCreate(path) {
return this._filesToCreate.has(path);
}
willOverwrite(path) {
return this._filesToOverwrite.has(path);
}
willDelete(path) {
return this._filesToDelete.has(path);
}
willRename(path) {
return this._filesToRename.has(path);
}
willRenameTo(path, to) {
return this._filesToRename.get(path) === to;
}
}
exports.CordHost = CordHost;
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {\n  EMPTY,\n  Observable,\n  concat,\n  concatMap,\n  map,\n  from as observableFrom,\n  of,\n  reduce,\n  switchMap,\n  throwError,\n  toArray,\n} from 'rxjs';\nimport {\n  FileAlreadyExistException,\n  FileDoesNotExistException,\n  PathIsDirectoryException,\n  UnknownException,\n} from '../../exception';\nimport { Path, PathFragment } from '../path';\nimport {\n  FileBuffer,\n  Host,\n  HostCapabilities,\n  HostWatchOptions,\n  ReadonlyHost,\n  Stats,\n} from './interface';\nimport { SimpleMemoryHost } from './memory';\n\nexport interface CordHostCreate {\n  kind: 'create';\n  path: Path;\n  content: FileBuffer;\n}\nexport interface CordHostOverwrite {\n  kind: 'overwrite';\n  path: Path;\n  content: FileBuffer;\n}\nexport interface CordHostRename {\n  kind: 'rename';\n  from: Path;\n  to: Path;\n}\nexport interface CordHostDelete {\n  kind: 'delete';\n  path: Path;\n}\nexport type CordHostRecord = CordHostCreate | CordHostOverwrite | CordHostRename | CordHostDelete;\n\n/**\n * A Host that records changes to the underlying Host, while keeping a record of Create, Overwrite,\n * Rename and Delete of files.\n *\n * This is fully compatible with Host, but will keep a staging of every changes asked. That staging\n * follows the principle of the Tree (e.g. can create a file that already exists).\n *\n * Using `create()` and `overwrite()` will force those operations, but using `write` will add\n * the create/overwrite records IIF the files does/doesn't already exist.\n */\nexport class CordHost extends SimpleMemoryHost {\n  protected _filesToCreate = new Set<Path>();\n  protected _filesToRename = new Map<Path, Path>();\n  protected _filesToRenameRevert = new Map<Path, Path>();\n  protected _filesToDelete = new Set<Path>();\n  protected _filesToOverwrite = new Set<Path>();\n\n  constructor(protected _back: ReadonlyHost) {\n    super();\n  }\n\n  get backend(): ReadonlyHost {\n    return this._back;\n  }\n  override get capabilities(): HostCapabilities {\n    // Our own host is always Synchronous, but the backend might not be.\n    return {\n      synchronous: this._back.capabilities.synchronous,\n    };\n  }\n\n  /**\n   * Create a copy of this host, including all actions made.\n   * @returns {CordHost} The carbon copy.\n   */\n  clone(): CordHost {\n    const dolly = new CordHost(this._back);\n\n    dolly._cache = new Map(this._cache);\n    dolly._filesToCreate = new Set(this._filesToCreate);\n    dolly._filesToRename = new Map(this._filesToRename);\n    dolly._filesToRenameRevert = new Map(this._filesToRenameRevert);\n    dolly._filesToDelete = new Set(this._filesToDelete);\n    dolly._filesToOverwrite = new Set(this._filesToOverwrite);\n\n    return dolly;\n  }\n\n  /**\n   * Commit the changes recorded to a Host. It is assumed that the host does have the same structure\n   * as the host that was used for backend (could be the same host).\n   * @param host The host to create/delete/rename/overwrite files to.\n   * @param force Whether to skip existence checks when creating/overwriting. This is\n   *   faster but might lead to incorrect states. Because Hosts natively don't support creation\n   *   versus overwriting (it's only writing), we check for existence before completing a request.\n   * @returns An observable that completes when done, or error if an error occured.\n   */\n  commit(host: Host, force = false): Observable<void> {\n    // Really commit everything to the actual host.\n    return observableFrom(this.records()).pipe(\n      concatMap((record) => {\n        switch (record.kind) {\n          case 'delete':\n            return host.delete(record.path);\n          case 'rename':\n            return host.rename(record.from, record.to);\n          case 'create':\n            return host.exists(record.path).pipe(\n              switchMap((exists) => {\n                if (exists && !force) {\n                  return throwError(new FileAlreadyExistException(record.path));\n                } else {\n                  return host.write(record.path, record.content);\n                }\n              }),\n            );\n          case 'overwrite':\n            return host.exists(record.path).pipe(\n              switchMap((exists) => {\n                if (!exists && !force) {\n                  return throwError(new FileDoesNotExistException(record.path));\n                } else {\n                  return host.write(record.path, record.content);\n                }\n              }),\n            );\n        }\n      }),\n      reduce(() => {}),\n    );\n  }\n\n  records(): CordHostRecord[] {\n    return [\n      ...[...this._filesToDelete.values()].map(\n        (path) =>\n          ({\n            kind: 'delete',\n            path,\n          } as CordHostRecord),\n      ),\n      ...[...this._filesToRename.entries()].map(\n        ([from, to]) =>\n          ({\n            kind: 'rename',\n            from,\n            to,\n          } as CordHostRecord),\n      ),\n      ...[...this._filesToCreate.values()].map(\n        (path) =>\n          ({\n            kind: 'create',\n            path,\n            content: this._read(path),\n          } as CordHostRecord),\n      ),\n      ...[...this._filesToOverwrite.values()].map(\n        (path) =>\n          ({\n            kind: 'overwrite',\n            path,\n            content: this._read(path),\n          } as CordHostRecord),\n      ),\n    ];\n  }\n\n  /**\n   * Specialized version of {@link CordHost#write} which forces the creation of a file whether it\n   * exists or not.\n   * @param {} path\n   * @param {FileBuffer} content\n   * @returns {Observable<void>}\n   */\n  create(path: Path, content: FileBuffer): Observable<void> {\n    if (super._exists(path)) {\n      throw new FileAlreadyExistException(path);\n    }\n\n    if (this._filesToDelete.has(path)) {\n      this._filesToDelete.delete(path);\n      this._filesToOverwrite.add(path);\n    } else {\n      this._filesToCreate.add(path);\n    }\n\n    return super.write(path, content);\n  }\n\n  overwrite(path: Path, content: FileBuffer): Observable<void> {\n    return this.isDirectory(path).pipe(\n      switchMap((isDir) => {\n        if (isDir) {\n          return throwError(new PathIsDirectoryException(path));\n        }\n\n        return this.exists(path);\n      }),\n      switchMap((exists) => {\n        if (!exists) {\n          return throwError(new FileDoesNotExistException(path));\n        }\n\n        if (!this._filesToCreate.has(path)) {\n          this._filesToOverwrite.add(path);\n        }\n\n        return super.write(path, content);\n      }),\n    );\n  }\n\n  override write(path: Path, content: FileBuffer): Observable<void> {\n    return this.exists(path).pipe(\n      switchMap((exists) => {\n        if (exists) {\n          // It exists, but might be being renamed or deleted. In that case we want to create it.\n          if (this.willRename(path) || this.willDelete(path)) {\n            return this.create(path, content);\n          } else {\n            return this.overwrite(path, content);\n          }\n        } else {\n          return this.create(path, content);\n        }\n      }),\n    );\n  }\n\n  override read(path: Path): Observable<FileBuffer> {\n    if (this._exists(path)) {\n      return super.read(path);\n    }\n\n    return this._back.read(path);\n  }\n\n  override delete(path: Path): Observable<void> {\n    if (this._exists(path)) {\n      if (this._filesToCreate.has(path)) {\n        this._filesToCreate.delete(path);\n      } else if (this._filesToOverwrite.has(path)) {\n        this._filesToOverwrite.delete(path);\n        this._filesToDelete.add(path);\n      } else {\n        const maybeOrigin = this._filesToRenameRevert.get(path);\n        if (maybeOrigin) {\n          this._filesToRenameRevert.delete(path);\n          this._filesToRename.delete(maybeOrigin);\n          this._filesToDelete.add(maybeOrigin);\n        } else {\n          return throwError(\n            new UnknownException(`This should never happen. Path: ${JSON.stringify(path)}.`),\n          );\n        }\n      }\n\n      return super.delete(path);\n    } else {\n      return this._back.exists(path).pipe(\n        switchMap((exists) => {\n          if (exists) {\n            this._filesToDelete.add(path);\n\n            return of<void>();\n          } else {\n            return throwError(new FileDoesNotExistException(path));\n          }\n        }),\n      );\n    }\n  }\n\n  override rename(from: Path, to: Path): Observable<void> {\n    return concat(this.exists(to), this.exists(from)).pipe(\n      toArray(),\n      switchMap(([existTo, existFrom]) => {\n        if (!existFrom) {\n          return throwError(new FileDoesNotExistException(from));\n        }\n        if (from === to) {\n          return EMPTY;\n        }\n\n        if (existTo) {\n          return throwError(new FileAlreadyExistException(to));\n        }\n\n        // If we're renaming a file that's been created, shortcircuit to creating the `to` path.\n        if (this._filesToCreate.has(from)) {\n          this._filesToCreate.delete(from);\n          this._filesToCreate.add(to);\n\n          return super.rename(from, to);\n        }\n        if (this._filesToOverwrite.has(from)) {\n          this._filesToOverwrite.delete(from);\n\n          // Recursively call this function. This is so we don't repeat the bottom logic. This\n          // if will be by-passed because we just deleted the `from` path from files to overwrite.\n          return concat(\n            this.rename(from, to),\n            new Observable<never>((x) => {\n              this._filesToOverwrite.add(to);\n              x.complete();\n            }),\n          );\n        }\n        if (this._filesToDelete.has(to)) {\n          this._filesToDelete.delete(to);\n          this._filesToDelete.add(from);\n          this._filesToOverwrite.add(to);\n\n          // We need to delete the original and write the new one.\n          return this.read(from).pipe(map((content) => this._write(to, content)));\n        }\n\n        const maybeTo1 = this._filesToRenameRevert.get(from);\n        if (maybeTo1) {\n          // We already renamed to this file (A => from), let's rename the former to the new\n          // path (A => to).\n          this._filesToRename.delete(maybeTo1);\n          this._filesToRenameRevert.delete(from);\n          from = maybeTo1;\n        }\n\n        this._filesToRename.set(from, to);\n        this._filesToRenameRevert.set(to, from);\n\n        // If the file is part of our data, just rename it internally.\n        if (this._exists(from)) {\n          return super.rename(from, to);\n        } else {\n          // Create a file with the same content.\n          return this._back.read(from).pipe(switchMap((content) => super.write(to, content)));\n        }\n      }),\n    );\n  }\n\n  override list(path: Path): Observable<PathFragment[]> {\n    return concat(super.list(path), this._back.list(path)).pipe(\n      reduce((list: Set<PathFragment>, curr: PathFragment[]) => {\n        curr.forEach((elem) => list.add(elem));\n\n        return list;\n      }, new Set<PathFragment>()),\n      map((set) => [...set]),\n    );\n  }\n\n  override exists(path: Path): Observable<boolean> {\n    return this._exists(path)\n      ? of(true)\n      : this.willDelete(path) || this.willRename(path)\n      ? of(false)\n      : this._back.exists(path);\n  }\n  override isDirectory(path: Path): Observable<boolean> {\n    return this._exists(path) ? super.isDirectory(path) : this._back.isDirectory(path);\n  }\n  override isFile(path: Path): Observable<boolean> {\n    return this._exists(path)\n      ? super.isFile(path)\n      : this.willDelete(path) || this.willRename(path)\n      ? of(false)\n      : this._back.isFile(path);\n  }\n\n  override stat(path: Path): Observable<Stats | null> | null {\n    return this._exists(path)\n      ? super.stat(path)\n      : this.willDelete(path) || this.willRename(path)\n      ? of(null)\n      : this._back.stat(path);\n  }\n\n  override watch(path: Path, options?: HostWatchOptions) {\n    // Watching not supported.\n    return null;\n  }\n\n  willCreate(path: Path) {\n    return this._filesToCreate.has(path);\n  }\n  willOverwrite(path: Path) {\n    return this._filesToOverwrite.has(path);\n  }\n  willDelete(path: Path) {\n    return this._filesToDelete.has(path);\n  }\n  willRename(path: Path) {\n    return this._filesToRename.has(path);\n  }\n  willRenameTo(path: Path, to: Path) {\n    return this._filesToRename.get(path) === to;\n  }\n}\n"]}