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4 years ago
"use strict";
const path = require("path");
/**
* @param {string} context context for relative path
* @param {string} relativePath path
* @returns {string} absolute path
*/
const requestToAbsolute = (context, relativePath) => {
if (relativePath.startsWith("./") || relativePath.startsWith("../"))
return path.join(context, relativePath);
return relativePath;
};
/**
* @typedef {Object} MakeRelativePathsCache
* @property {Map<string, Map<string, string>>=} relativePaths
*/
/**
*
* @param {string} maybeAbsolutePath path to check
* @returns {boolean} returns true if path is "Absolute Path"-like
*/
const looksLikeAbsolutePath = maybeAbsolutePath => {
if (/^\/.*\/$/.test(maybeAbsolutePath)) {
// this 'path' is actually a regexp generated by dynamic requires.
// Don't treat it as an absolute path.
return false;
}
return /^(?:[a-z]:\\|\/)/i.test(maybeAbsolutePath);
};
/**
*
* @param {string} p path to normalize
* @returns {string} normalized version of path
*/
const normalizePathSeparator = p => p.replace(/\\/g, "/");
/**
*
* @param {string} context context for relative path
* @param {string} identifier identifier for path
* @returns {string} a converted relative path
*/
const _makePathsRelative = (context, identifier) => {
return identifier
.split(/([|! ])/)
.map(str =>
looksLikeAbsolutePath(str)
? normalizePathSeparator(path.relative(context, str))
: str
)
.join("");
};
/**
*
* @param {string} context context used to create relative path
* @param {string} identifier identifier used to create relative path
* @param {MakeRelativePathsCache=} cache the cache object being set
* @returns {string} the returned relative path
*/
exports.makePathsRelative = (context, identifier, cache) => {
if (!cache) return _makePathsRelative(context, identifier);
const relativePaths =
cache.relativePaths || (cache.relativePaths = new Map());
let cachedResult;
let contextCache = relativePaths.get(context);
if (contextCache === undefined) {
relativePaths.set(context, (contextCache = new Map()));
} else {
cachedResult = contextCache.get(identifier);
}
if (cachedResult !== undefined) {
return cachedResult;
} else {
const relativePath = _makePathsRelative(context, identifier);
contextCache.set(identifier, relativePath);
return relativePath;
}
};
/**
* @param {string} context absolute context path
* @param {string} request any request string may containing absolute paths, query string, etc.
* @returns {string} a new request string avoiding absolute paths when possible
*/
exports.contextify = (context, request) => {
return request
.split("!")
.map(r => {
const splitPath = r.split("?", 2);
if (/^[a-zA-Z]:\\/.test(splitPath[0])) {
splitPath[0] = path.win32.relative(context, splitPath[0]);
if (!/^[a-zA-Z]:\\/.test(splitPath[0])) {
splitPath[0] = splitPath[0].replace(/\\/g, "/");
}
}
if (/^\//.test(splitPath[0])) {
splitPath[0] = path.posix.relative(context, splitPath[0]);
}
if (!/^(\.\.\/|\/|[a-zA-Z]:\\)/.test(splitPath[0])) {
splitPath[0] = "./" + splitPath[0];
}
return splitPath.join("?");
})
.join("!");
};
/**
* @param {string} context absolute context path
* @param {string} request any request string
* @returns {string} a new request string using absolute paths when possible
*/
const _absolutify = (context, request) => {
return request
.split("!")
.map(r => requestToAbsolute(context, r))
.join("!");
};
exports.absolutify = _absolutify;