1 | "use strict";
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2 | /**
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3 | * @license
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4 | * Copyright Google LLC All Rights Reserved.
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5 | *
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6 | * Use of this source code is governed by an MIT-style license that can be
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7 | * found in the LICENSE file at https://angular.io/license
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8 | */
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9 | Object.defineProperty(exports, "__esModule", { value: true });
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10 | exports.AliasHost = void 0;
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11 | const path_1 = require("../path");
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12 | const resolver_1 = require("./resolver");
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13 | /**
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14 | * A Virtual Host that allow to alias some paths to other paths.
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15 | *
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16 | * This does not verify, when setting an alias, that the target or source exist. Neither does it
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17 | * check whether it's a file or a directory. Please not that directories are also renamed/replaced.
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18 | *
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19 | * No recursion is done on the resolution, which means the following is perfectly valid then:
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20 | *
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21 | * ```
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22 | * host.aliases.set(normalize('/file/a'), normalize('/file/b'));
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23 | * host.aliases.set(normalize('/file/b'), normalize('/file/a'));
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24 | * ```
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25 | *
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26 | * This will result in a proper swap of two files for each others.
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27 | *
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28 | * @example
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29 | * const host = new SimpleMemoryHost();
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30 | * host.write(normalize('/some/file'), content).subscribe();
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31 | *
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32 | * const aHost = new AliasHost(host);
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33 | * aHost.read(normalize('/some/file'))
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34 | * .subscribe(x => expect(x).toBe(content));
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35 | * aHost.aliases.set(normalize('/some/file'), normalize('/other/path');
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36 | *
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37 | * // This file will not exist because /other/path does not exist.
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38 | * aHost.read(normalize('/some/file'))
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39 | * .subscribe(undefined, err => expect(err.message).toMatch(/does not exist/));
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40 | *
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41 | * @example
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42 | * const host = new SimpleMemoryHost();
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43 | * host.write(normalize('/some/folder/file'), content).subscribe();
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44 | *
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45 | * const aHost = new AliasHost(host);
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46 | * aHost.read(normalize('/some/folder/file'))
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47 | * .subscribe(x => expect(x).toBe(content));
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48 | * aHost.aliases.set(normalize('/some'), normalize('/other');
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49 | *
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50 | * // This file will not exist because /other/path does not exist.
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51 | * aHost.read(normalize('/some/folder/file'))
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52 | * .subscribe(undefined, err => expect(err.message).toMatch(/does not exist/));
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53 | *
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54 | * // Create the file with new content and verify that this has the new content.
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55 | * aHost.write(normalize('/other/folder/file'), content2).subscribe();
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56 | * aHost.read(normalize('/some/folder/file'))
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57 | * .subscribe(x => expect(x).toBe(content2));
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58 | */
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59 | class AliasHost extends resolver_1.ResolverHost {
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60 | constructor() {
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61 | super(...arguments);
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62 | this._aliases = new Map();
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63 | }
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64 | _resolve(path) {
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65 | let maybeAlias = this._aliases.get(path);
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66 | const sp = path_1.split(path);
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67 | const remaining = [];
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68 | // Also resolve all parents of the requested files, only picking the first one that matches.
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69 | // This can have surprising behaviour when aliases are inside another alias. It will always
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70 | // use the closest one to the file.
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71 | while (!maybeAlias && sp.length > 0) {
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72 | const p = path_1.join(path_1.NormalizedRoot, ...sp);
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73 | maybeAlias = this._aliases.get(p);
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74 | if (maybeAlias) {
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75 | maybeAlias = path_1.join(maybeAlias, ...remaining);
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76 | }
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77 | // Allow non-null-operator because we know sp.length > 0 (condition on while).
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78 | remaining.unshift(sp.pop()); // eslint-disable-line @typescript-eslint/no-non-null-assertion
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79 | }
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80 | return maybeAlias || path;
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81 | }
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82 | get aliases() {
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83 | return this._aliases;
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84 | }
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85 | }
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86 | exports.AliasHost = AliasHost;
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