1 files changed, 131 insertions, 0 deletions
diff --git a/browser/base/content/test/general/parsingTestHelpers.jsm b/browser/base/content/test/general/parsingTestHelpers.jsm
new file mode 100644
index 0000000000..69c764483e
--- /dev/null
+++ b/browser/base/content/test/general/parsingTestHelpers.jsm
@@ -0,0 +1,131 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+this.EXPORTED_SYMBOLS = ["generateURIsFromDirTree"];
+
+const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
+
+/* Shorthand constructors to construct an nsI(Local)File and zip reader: */
+const LocalFile = new Components.Constructor("@mozilla.org/file/local;1", Ci.nsIFile, "initWithPath");
+const ZipReader = new Components.Constructor("@mozilla.org/libjar/zip-reader;1", "nsIZipReader", "open");
+
+
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/osfile.jsm");
+Cu.import("resource://gre/modules/Task.jsm");
+
+
+/**
+ * Returns a promise that is resolved with a list of files that have one of the
+ * extensions passed, represented by their nsIURI objects, which exist inside
+ * the directory passed.
+ *
+ * @param dir the directory which to scan for files (nsIFile)
+ * @param extensions the extensions of files we're interested in (Array).
+ */
+function generateURIsFromDirTree(dir, extensions) {
+  if (!Array.isArray(extensions)) {
+    extensions = [extensions];
+  }
+  let dirQueue = [dir.path];
+  return Task.spawn(function*() {
+    let rv = [];
+    while (dirQueue.length) {
+      let nextDir = dirQueue.shift();
+      let {subdirs, files} = yield iterateOverPath(nextDir, extensions);
+      dirQueue.push(...subdirs);
+      rv.push(...files);
+    }
+    return rv;
+  });
+}
+
+/**
+ * Uses OS.File.DirectoryIterator to asynchronously iterate over a directory.
+ * It returns a promise that is resolved with an object with two properties:
+ *  - files: an array of nsIURIs corresponding to files that match the extensions passed
+ *  - subdirs: an array of paths for subdirectories we need to recurse into
+ *             (handled by generateURIsFromDirTree above)
+ *
+ * @param path the path to check (string)
+ * @param extensions the file extensions we're interested in.
+ */
+function iterateOverPath(path, extensions) {
+  let iterator = new OS.File.DirectoryIterator(path);
+  let parentDir = new LocalFile(path);
+  let subdirs = [];
+  let files = [];
+
+  let pathEntryIterator = (entry) => {
+    if (entry.isDir) {
+      subdirs.push(entry.path);
+    } else if (extensions.some((extension) => entry.name.endsWith(extension))) {
+      let file = parentDir.clone();
+      file.append(entry.name);
+      // the build system might leave dead symlinks hanging around, which are
+      // returned as part of the directory iterator, but don't actually exist:
+      if (file.exists()) {
+        let uriSpec = getURLForFile(file);
+        files.push(Services.io.newURI(uriSpec, null, null));
+      }
+    } else if (entry.name.endsWith(".ja") || entry.name.endsWith(".jar") ||
+               entry.name.endsWith(".zip") || entry.name.endsWith(".xpi")) {
+      let file = parentDir.clone();
+      file.append(entry.name);
+      for (let extension of extensions) {
+        let jarEntryIterator = generateEntriesFromJarFile(file, extension);
+        files.push(...jarEntryIterator);
+      }
+    }
+  };
+
+  return new Promise((resolve, reject) => {
+    Task.spawn(function* () {
+      try {
+        // Iterate through the directory
+        yield iterator.forEach(pathEntryIterator);
+        resolve({files: files, subdirs: subdirs});
+      } catch (ex) {
+        reject(ex);
+      } finally {
+        iterator.close();
+      }
+    });
+  });
+}
+
+/* Helper function to generate a URI spec (NB: not an nsIURI yet!)
+ * given an nsIFile object */
+function getURLForFile(file) {
+  let fileHandler = Services.io.getProtocolHandler("file");
+  fileHandler = fileHandler.QueryInterface(Ci.nsIFileProtocolHandler);
+  return fileHandler.getURLSpecFromActualFile(file);
+}
+
+/**
+ * A generator that generates nsIURIs for particular files found in jar files
+ * like omni.ja.
+ *
+ * @param jarFile an nsIFile object for the jar file that needs checking.
+ * @param extension the extension we're interested in.
+ */
+function* generateEntriesFromJarFile(jarFile, extension) {
+  let zr = new ZipReader(jarFile);
+  let entryEnumerator = zr.findEntries("*" + extension + "$");
+
+  const kURIStart = getURLForFile(jarFile);
+  while (entryEnumerator.hasMore()) {
+    let entry = entryEnumerator.getNext();
+    // Ignore the JS cache which is stored in omni.ja
+    if (entry.startsWith("jsloader") || entry.startsWith("jssubloader")) {
+      continue;
+    }
+    let entryURISpec = "jar:" + kURIStart + "!/" + entry;
+    yield Services.io.newURI(entryURISpec, null, null);
+  }
+  zr.close();
+}
+
+