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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const forEachBail = require("./forEachBail");
const { decodeText } = require("./util/fs");
/** @typedef {import("./Resolver")} Resolver */
/** @typedef {import("./Resolver").JsonObject} JsonObject */
/** @typedef {import("./Resolver").JsonValue} JsonValue */
/** @typedef {import("./Resolver").ResolveContext} ResolveContext */
/** @typedef {import("./Resolver").ResolveRequest} ResolveRequest */
/**
* @typedef {object} DescriptionFileInfo
* @property {JsonObject=} content content
* @property {string} path path
* @property {string} directory directory
*/
/**
* @callback ErrorFirstCallback
* @param {Error | null=} error
* @param {DescriptionFileInfo=} result
*/
/**
* @typedef {object} Result
* @property {string} path path to description file
* @property {string} directory directory of description file
* @property {JsonObject} content content of description file
*/
const CHAR_SLASH = 47;
const CHAR_BACKSLASH = 92;
/**
* Walk up one directory. Called once per package-root candidate and once per
* `described-resolve` (to find the enclosing description file), so it's on
* the resolver's hot path.
*
* Previous implementation called `lastIndexOf("/")` and `lastIndexOf("\\")`
* separately and then picked the larger. For any non-trivial directory
* string on POSIX, `lastIndexOf("\\")` scans the full string just to return
* -1. A single reverse char-code scan does the same work in one pass.
*
* Any single-character directory is treated as a root — `directory.length
* <= 1` collapses the `"/"`, `"\\"` and `""` branches into one compare.
* Without the `"\\"` case, `cdUp("\\")` (reached from a UNC root or a DOS
* device path like `\\?\…`) would return itself via `slice(0, i || 1)`
* and trap `loadDescriptionFile` in an infinite loop. Once single-char
* roots are filtered up front, the reverse scan always produces a
* strictly shorter string.
* @param {string} directory directory
* @returns {string | null} parent directory or null
*/
function cdUp(directory) {
if (directory.length <= 1) return null;
for (let i = directory.length - 1; i >= 0; i--) {
const code = directory.charCodeAt(i);
if (code === CHAR_SLASH || code === CHAR_BACKSLASH) {
return directory.slice(0, i || 1);
}
}
return null;
}
/**
* @param {Resolver} resolver resolver
* @param {string} directory directory
* @param {string[]} filenames filenames
* @param {DescriptionFileInfo | undefined} oldInfo oldInfo
* @param {ResolveContext} resolveContext resolveContext
* @param {ErrorFirstCallback} callback callback
*/
function loadDescriptionFile(
resolver,
directory,
filenames,
oldInfo,
resolveContext,
callback,
) {
// Hoist the per-filename iterator and the per-level done callback out
// of `findDescriptionFile`. They both close over `directory`, which we
// reassign as we walk up the tree, so the same closures keep working
// across every level — the previous implementation re-allocated both
// arrows on every recursion step, which adds up on deep walks (multiple
// `DescriptionFilePlugin` taps per resolve, each climbing several
// directories looking for `package.json`).
/**
* @param {string} filename filename
* @param {(err?: null | Error, result?: null | Result) => void} iterCallback callback
* @returns {void}
*/
const iterFilename = (filename, iterCallback) => {
const descriptionFilePath = resolver.join(directory, filename);
/**
* @param {(null | Error)=} err error
* @param {JsonObject=} resolvedContent content
* @returns {void}
*/
function onJson(err, resolvedContent) {
if (err) {
if (resolveContext.log) {
resolveContext.log(
`${descriptionFilePath} (directory description file): ${err}`,
);
} else {
err.message = `${descriptionFilePath} (directory description file): ${err}`;
}
return iterCallback(err);
}
iterCallback(null, {
content: /** @type {JsonObject} */ (resolvedContent),
directory,
path: descriptionFilePath,
});
}
if (resolver.fileSystem.readJson) {
resolver.fileSystem.readJson(descriptionFilePath, (err, content) => {
if (err) {
if (
typeof (/** @type {NodeJS.ErrnoException} */ (err).code) !==
"undefined"
) {
if (resolveContext.missingDependencies) {
resolveContext.missingDependencies.add(descriptionFilePath);
}
return iterCallback();
}
if (resolveContext.fileDependencies) {
resolveContext.fileDependencies.add(descriptionFilePath);
}
return onJson(err);
}
if (resolveContext.fileDependencies) {
resolveContext.fileDependencies.add(descriptionFilePath);
}
onJson(null, content);
});
} else {
resolver.fileSystem.readFile(descriptionFilePath, (err, content) => {
if (err) {
if (resolveContext.missingDependencies) {
resolveContext.missingDependencies.add(descriptionFilePath);
}
return iterCallback();
}
if (resolveContext.fileDependencies) {
resolveContext.fileDependencies.add(descriptionFilePath);
}
/** @type {JsonObject | undefined} */
let json;
if (content) {
try {
json = JSON.parse(decodeText(content));
} catch (/** @type {unknown} */ err_) {
return onJson(/** @type {Error} */ (err_));
}
} else {
return onJson(new Error("No content in file"));
}
onJson(null, json);
});
}
};
// Forward-declared so the helpers below can reference each other
// without falling foul of `no-use-before-define`.
/** @type {() => void} */
let findDescriptionFile;
/**
* @param {(null | Error)=} err error
* @param {(null | Result)=} result result
* @returns {void}
*/
const onLevelDone = (err, result) => {
if (err) return callback(err);
if (result) return callback(null, result);
const dir = cdUp(directory);
if (!dir) {
return callback();
}
directory = dir;
return findDescriptionFile();
};
findDescriptionFile = () => {
if (oldInfo && oldInfo.directory === directory) {
// We already have info for this directory and can reuse it
return callback(null, oldInfo);
}
forEachBail(filenames, iterFilename, onLevelDone);
};
findDescriptionFile();
}
/**
* @param {JsonObject} content content
* @param {string | string[]} field field
* @returns {JsonValue | undefined} field data
*/
function getField(content, field) {
if (!content) return undefined;
if (Array.isArray(field)) {
/** @type {JsonValue} */
let current = content;
for (let j = 0; j < field.length; j++) {
if (current === null || typeof current !== "object") {
current = null;
break;
}
current = /** @type {JsonValue} */ (
/** @type {JsonObject} */
(current)[field[j]]
);
}
return current;
}
return content[field];
}
module.exports.cdUp = cdUp;
module.exports.getField = getField;
module.exports.loadDescriptionFile = loadDescriptionFile;