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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import {
MediaType,
SourceFile,
SourceFileJson
} from "./compiler_sourcefile.ts";
import { cwd } from "./dir.ts";
import { sendAsync, sendSync } from "./dispatch_json.ts";
import { assert } from "./util.ts";
import * as util from "./util.ts";
/** Resolve a path to the final path segment passed. */
function resolvePath(...pathSegments: string[]): string {
let resolvedPath = "";
let resolvedAbsolute = false;
for (let i = pathSegments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
let path: string;
if (i >= 0) path = pathSegments[i];
else path = cwd();
// Skip empty entries
if (path.length === 0) {
continue;
}
resolvedPath = `${path}/${resolvedPath}`;
resolvedAbsolute = path.charCodeAt(0) === util.CHAR_FORWARD_SLASH;
}
// At this point the path should be resolved to a full absolute path, but
// handle relative paths to be safe (might happen when cwd() fails)
// Normalize the path
resolvedPath = util.normalizeString(
resolvedPath,
!resolvedAbsolute,
"/",
code => code === util.CHAR_FORWARD_SLASH
);
if (resolvedAbsolute) {
if (resolvedPath.length > 0) return `/${resolvedPath}`;
else return "/";
} else if (resolvedPath.length > 0) return resolvedPath;
else return ".";
}
/** Resolve a relative specifier based on the referrer. Used when resolving
* modules internally within the runtime compiler API. */
function resolveSpecifier(specifier: string, referrer: string): string {
if (!specifier.startsWith(".")) {
return specifier;
}
const pathParts = referrer.split("/");
pathParts.pop();
let path = pathParts.join("/");
path = path.endsWith("/") ? path : `${path}/`;
return resolvePath(path, specifier);
}
/** Ops to Rust to resolve modules' URLs. */
export function resolveModules(
specifiers: string[],
referrer?: string
): string[] {
util.log("compiler_imports::resolveModules", { specifiers, referrer });
return sendSync("op_resolve_modules", { specifiers, referrer });
}
/** Ops to Rust to fetch modules meta data. */
function fetchSourceFiles(
specifiers: string[],
referrer?: string
): Promise<SourceFileJson[]> {
util.log("compiler_imports::fetchSourceFiles", { specifiers, referrer });
return sendAsync("op_fetch_source_files", {
specifiers,
referrer
});
}
/** Given a filename, determine the media type based on extension. Used when
* resolving modules internally in a runtime compile. */
function getMediaType(filename: string): MediaType {
const maybeExtension = /\.([a-zA-Z]+)$/.exec(filename);
if (!maybeExtension) {
util.log(`!!! Could not identify valid extension: "${filename}"`);
return MediaType.Unknown;
}
const [, extension] = maybeExtension;
switch (extension.toLowerCase()) {
case "js":
return MediaType.JavaScript;
case "jsx":
return MediaType.JSX;
case "json":
return MediaType.Json;
case "ts":
return MediaType.TypeScript;
case "tsx":
return MediaType.TSX;
case "wasm":
return MediaType.Wasm;
default:
util.log(`!!! Unknown extension: "${extension}"`);
return MediaType.Unknown;
}
}
/** Recursively process the imports of modules from within the supplied sources,
* generating `SourceFile`s of any imported files.
*
* Specifiers are supplied in an array of tuples where the first is the
* specifier that will be requested in the code and the second is the specifier
* that should be actually resolved. */
export function processLocalImports(
sources: Record<string, string>,
specifiers: Array<[string, string]>,
referrer?: string,
checkJs = false
): string[] {
if (!specifiers.length) {
return [];
}
const moduleNames = specifiers.map(
referrer
? ([, specifier]): string => resolveSpecifier(specifier, referrer)
: ([, specifier]): string => specifier
);
for (let i = 0; i < moduleNames.length; i++) {
const moduleName = moduleNames[i];
assert(moduleName in sources, `Missing module in sources: "${moduleName}"`);
const sourceFile =
SourceFile.get(moduleName) ||
new SourceFile({
url: moduleName,
filename: moduleName,
sourceCode: sources[moduleName],
mediaType: getMediaType(moduleName)
});
sourceFile.cache(specifiers[i][0], referrer);
if (!sourceFile.processed) {
processLocalImports(
sources,
sourceFile.imports(checkJs),
sourceFile.url,
checkJs
);
}
}
return moduleNames;
}
/** Recursively process the imports of modules, generating `SourceFile`s of any
* imported files.
*
* Specifiers are supplied in an array of tuples where the first is the
* specifier that will be requested in the code and the second is the specifier
* that should be actually resolved. */
export async function processImports(
specifiers: Array<[string, string]>,
referrer?: string,
checkJs = false
): Promise<string[]> {
if (!specifiers.length) {
return [];
}
const sources = specifiers.map(([, moduleSpecifier]) => moduleSpecifier);
const resolvedSources = resolveModules(sources, referrer);
const sourceFiles = await fetchSourceFiles(resolvedSources, referrer);
assert(sourceFiles.length === specifiers.length);
for (let i = 0; i < sourceFiles.length; i++) {
const sourceFileJson = sourceFiles[i];
const sourceFile =
SourceFile.get(sourceFileJson.url) || new SourceFile(sourceFileJson);
sourceFile.cache(specifiers[i][0], referrer);
if (!sourceFile.processed) {
await processImports(
sourceFile.imports(checkJs),
sourceFile.url,
checkJs
);
}
}
return resolvedSources;
}
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