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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import { getMappedModuleName, parseTypeDirectives } from "./type_directives.ts";
import { assert, log } from "../util.ts";
// Warning! The values in this enum are duplicated in `cli/msg.rs`
// Update carefully!
export enum MediaType {
JavaScript = 0,
JSX = 1,
TypeScript = 2,
TSX = 3,
Json = 4,
Wasm = 5,
Unknown = 6
}
/** The shape of the SourceFile that comes from the privileged side */
export interface SourceFileJson {
url: string;
filename: string;
mediaType: MediaType;
sourceCode: string;
}
export const ASSETS = "$asset$";
/** Returns the TypeScript Extension enum for a given media type. */
function getExtension(fileName: string, mediaType: MediaType): ts.Extension {
switch (mediaType) {
case MediaType.JavaScript:
return ts.Extension.Js;
case MediaType.JSX:
return ts.Extension.Jsx;
case MediaType.TypeScript:
return fileName.endsWith(".d.ts") ? ts.Extension.Dts : ts.Extension.Ts;
case MediaType.TSX:
return ts.Extension.Tsx;
case MediaType.Json:
return ts.Extension.Json;
case MediaType.Wasm:
// Custom marker for Wasm type.
return ts.Extension.Js;
case MediaType.Unknown:
default:
throw TypeError(
`Cannot resolve extension for "${fileName}" with mediaType "${MediaType[mediaType]}".`
);
}
}
/** A self registering abstraction of source files. */
export class SourceFile {
extension!: ts.Extension;
filename!: string;
/** An array of tuples which represent the imports for the source file. The
* first element is the one that will be requested at compile time, the
* second is the one that should be actually resolved. This provides the
* feature of type directives for Deno. */
importedFiles?: Array<[string, string]>;
mediaType!: MediaType;
processed = false;
sourceCode?: string;
tsSourceFile?: ts.SourceFile;
url!: string;
constructor(json: SourceFileJson) {
if (SourceFile._moduleCache.has(json.url)) {
throw new TypeError("SourceFile already exists");
}
Object.assign(this, json);
this.extension = getExtension(this.url, this.mediaType);
SourceFile._moduleCache.set(this.url, this);
}
/** Cache the source file to be able to be retrieved by `moduleSpecifier` and
* `containingFile`. */
cache(moduleSpecifier: string, containingFile?: string): void {
containingFile = containingFile || "";
let innerCache = SourceFile._specifierCache.get(containingFile);
if (!innerCache) {
innerCache = new Map();
SourceFile._specifierCache.set(containingFile, innerCache);
}
innerCache.set(moduleSpecifier, this);
}
/** Process the imports for the file and return them. */
imports(processJsImports: boolean): Array<[string, string]> {
if (this.processed) {
throw new Error("SourceFile has already been processed.");
}
assert(this.sourceCode != null);
// we shouldn't process imports for files which contain the nocheck pragma
// (like bundles)
if (this.sourceCode.match(/\/{2}\s+@ts-nocheck/)) {
log(`Skipping imports for "${this.filename}"`);
return [];
}
const preProcessedFileInfo = ts.preProcessFile(
this.sourceCode,
true,
this.mediaType === MediaType.JavaScript ||
this.mediaType === MediaType.JSX
);
this.processed = true;
const files = (this.importedFiles = [] as Array<[string, string]>);
function process(references: Array<{ fileName: string }>): void {
for (const { fileName } of references) {
files.push([fileName, fileName]);
}
}
const {
importedFiles,
referencedFiles,
libReferenceDirectives,
typeReferenceDirectives
} = preProcessedFileInfo;
const typeDirectives = parseTypeDirectives(this.sourceCode);
if (typeDirectives) {
for (const importedFile of importedFiles) {
files.push([
importedFile.fileName,
getMappedModuleName(importedFile, typeDirectives)
]);
}
} else if (
!(
!processJsImports &&
(this.mediaType === MediaType.JavaScript ||
this.mediaType === MediaType.JSX)
)
) {
process(importedFiles);
}
process(referencedFiles);
// built in libs comes across as `"dom"` for example, and should be filtered
// out during pre-processing as they are either already cached or they will
// be lazily fetched by the compiler host. Ones that contain full files are
// not filtered out and will be fetched as normal.
process(
libReferenceDirectives.filter(
({ fileName }) => !ts.libMap.has(fileName.toLowerCase())
)
);
process(typeReferenceDirectives);
return files;
}
/** A cache of all the source files which have been loaded indexed by the
* url. */
private static _moduleCache: Map<string, SourceFile> = new Map();
/** A cache of source files based on module specifiers and containing files
* which is used by the TypeScript compiler to resolve the url */
private static _specifierCache: Map<
string,
Map<string, SourceFile>
> = new Map();
/** Retrieve a `SourceFile` based on a `moduleSpecifier` and `containingFile`
* or return `undefined` if not preset. */
static getUrl(
moduleSpecifier: string,
containingFile: string
): string | undefined {
const containingCache = this._specifierCache.get(containingFile);
if (containingCache) {
const sourceFile = containingCache.get(moduleSpecifier);
return sourceFile && sourceFile.url;
}
return undefined;
}
/** Retrieve a `SourceFile` based on a `url` */
static get(url: string): SourceFile | undefined {
return this._moduleCache.get(url);
}
/** Determine if a source file exists or not */
static has(url: string): boolean {
return this._moduleCache.has(url);
}
}
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