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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 | 496x 496x 588x 588x 523x 523x 523x 29428x 469x 742x 78x 1x 1x 1x 1x 1x 5x | import type IFileSystem from "../../types/IFileSystem";
import invariant from "../../utils/invariant";
/**
* One run's read-only view of the host port, in which each file's text is read
* once (#1444, owner ruling 3).
*
* 1.1 Discover reads through it, so every part of discovery that asks for a
* file sees the same text. `platformio.ini` was read once per directory that
* resolved includes, for `lib_extra_dirs`, and then again in Stage 3 for
* ADR-049's target. A save between those reads gave discovery one version of
* the file and the target another. Discovery now parses the project from
* this view too, so the target is read from the same text.
*
* Read-only, because 1.1 changes nothing on disk: 3.1 Write owns every change
* (#1653). A view that forwarded the mutating methods would be one more module
* able to write, so each refuses instead, and so does the preprocessor's
* scratch file, which 1.1 never needs.
*/
class ReadOnceFileSystem implements IFileSystem {
private readonly texts = new Map<string, string>();
constructor(private readonly host: IFileSystem) {}
readFile(path: string): string {
const known = this.texts.get(path);
if (known !== undefined) return known;
const text = this.host.readFile(path);
this.texts.set(path, text);
return text;
}
exists(path: string): boolean {
return this.host.exists(path);
}
isDirectory(path: string): boolean {
return this.host.isDirectory(path);
}
isFile(path: string): boolean {
return this.host.isFile(path);
}
readdir(path: string): string[] {
return this.host.readdir(path);
}
stat(path: string): { mtimeMs: number } {
return this.host.stat(path);
}
writeFile(path: string): void {
ReadOnceFileSystem.refuse("write", path);
}
mkdir(path: string): void {
ReadOnceFileSystem.refuse("create the directory", path);
}
unlink(path: string): void {
ReadOnceFileSystem.refuse("delete", path);
}
rename(from: string): void {
ReadOnceFileSystem.refuse("rename", from);
}
withTempFile<T>(name: string): Promise<T> {
return ReadOnceFileSystem.refuse("create the scratch file", name);
}
private static refuse(what: string, path: string): never {
invariant(
false,
`1.1 Discover changes nothing on disk (asked to ${what} ${path})`,
);
}
}
export default ReadOnceFileSystem;
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