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node_modules/less/lib/less-browser/file-manager.js

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+import AbstractFileManager from '../less/environment/abstract-file-manager.js';
+
+let options;
+let logger;
+let fileCache = {};
+
+// TODOS - move log somewhere. pathDiff and doing something similar in node. use pathDiff in the other browser file for the initial load
+const FileManager = function() {}
+FileManager.prototype = Object.assign(new AbstractFileManager(), {
+    alwaysMakePathsAbsolute() {
+        return true;
+    },
+
+    join(basePath, laterPath) {
+        if (!basePath) {
+            return laterPath;
+        }
+        return this.extractUrlParts(laterPath, basePath).path;
+    },
+
+    doXHR(url, type, callback, errback) {
+        const xhr = new XMLHttpRequest();
+        const async = options.isFileProtocol ? options.fileAsync : true;
+
+        if (typeof xhr.overrideMimeType === 'function') {
+            xhr.overrideMimeType('text/css');
+        }
+        logger.debug(`XHR: Getting '${url}'`);
+        xhr.open('GET', url, async);
+        xhr.setRequestHeader('Accept', type || 'text/x-less, text/css; q=0.9, */*; q=0.5');
+        xhr.send(null);
+
+        function handleResponse(xhr, callback, errback) {
+            if (xhr.status >= 200 && xhr.status < 300) {
+                callback(xhr.responseText,
+                    xhr.getResponseHeader('Last-Modified'));
+            } else if (typeof errback === 'function') {
+                errback(xhr.status, url);
+            }
+        }
+
+        if (options.isFileProtocol && !options.fileAsync) {
+            if (xhr.status === 0 || (xhr.status >= 200 && xhr.status < 300)) {
+                callback(xhr.responseText);
+            } else {
+                errback(xhr.status, url);
+            }
+        } else if (async) {
+            xhr.onreadystatechange = () => {
+                if (xhr.readyState == 4) {
+                    handleResponse(xhr, callback, errback);
+                }
+            };
+        } else {
+            handleResponse(xhr, callback, errback);
+        }
+    },
+
+    supports() {
+        return true;
+    },
+
+    clearFileCache() {
+        fileCache = {};
+    },
+
+    loadFile(filename, currentDirectory, options) {
+        // TODO: Add prefix support like less-node?
+        // What about multiple paths?
+
+        if (currentDirectory && !this.isPathAbsolute(filename)) {
+            filename = currentDirectory + filename;
+        }
+
+        filename = options.ext ? this.tryAppendExtension(filename, options.ext) : filename;
+
+        options = options || {};
+
+        // sheet may be set to the stylesheet for the initial load or a collection of properties including
+        // some context variables for imports
+        const hrefParts = this.extractUrlParts(filename, window.location.href);
+        const href      = hrefParts.url;
+        const self      = this;
+        
+        return new Promise((resolve, reject) => {
+            if (options.useFileCache && fileCache[href]) {
+                try {
+                    const lessText = fileCache[href];
+                    return resolve({ contents: lessText, filename: href, webInfo: { lastModified: new Date() }});
+                } catch (e) {
+                    return reject({ filename: href, message: `Error loading file ${href} error was ${e.message}` });
+                }
+            }
+
+            self.doXHR(href, options.mime, function doXHRCallback(data, lastModified) {
+                // per file cache
+                fileCache[href] = data;
+
+                // Use remote copy (re-parse)
+                resolve({ contents: data, filename: href, webInfo: { lastModified }});
+            }, function doXHRError(status, url) {
+                reject({ type: 'File', message: `'${url}' wasn't found (${status})`, href });
+            });
+        });
+    }
+});
+
+export default (opts, log) => {
+    options = opts;
+    logger = log;
+    return FileManager;
+}