1 files changed, 242 insertions, 0 deletions
diff --git a/addon-sdk/source/lib/sdk/system/xul-app.jsm b/addon-sdk/source/lib/sdk/system/xul-app.jsm
new file mode 100644
index 000000000..90681bb1b
--- /dev/null
+++ b/addon-sdk/source/lib/sdk/system/xul-app.jsm
@@ -0,0 +1,242 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+
+this.EXPORTED_SYMBOLS = [ "XulApp" ];
+
+var { classes: Cc, interfaces: Ci } = Components;
+
+var exports = {};
+this.XulApp = exports;
+
+var appInfo;
+
+// NOTE: below is required to avoid failing xpcshell tests,
+//       which do not implement nsIXULAppInfo
+// See Bug 1114752 https://bugzilla.mozilla.org/show_bug.cgi?id=1114752
+try {
+ appInfo = Cc["@mozilla.org/xre/app-info;1"]
+              .getService(Ci.nsIXULAppInfo);
+}
+catch (e) {
+  // xpcshell test case
+  appInfo = {};
+}
+var vc = Cc["@mozilla.org/xpcom/version-comparator;1"]
+         .getService(Ci.nsIVersionComparator);
+
+var ID = exports.ID = appInfo.ID;
+var name = exports.name = appInfo.name;
+var version = exports.version = appInfo.version;
+var platformVersion = exports.platformVersion = appInfo.platformVersion;
+
+// The following mapping of application names to GUIDs was taken from:
+//
+//   https://addons.mozilla.org/en-US/firefox/pages/appversions
+//
+// Using the GUID instead of the app's name is preferable because sometimes
+// re-branded versions of a product have different names: for instance,
+// Firefox, Minefield, Iceweasel, and Shiretoko all have the same
+// GUID.
+
+var ids = exports.ids = {
+  Firefox: "{ec8030f7-c20a-464f-9b0e-13a3a9e97384}",
+  Mozilla: "{86c18b42-e466-45a9-ae7a-9b95ba6f5640}",
+  SeaMonkey: "{92650c4d-4b8e-4d2a-b7eb-24ecf4f6b63a}",
+  Fennec: "{aa3c5121-dab2-40e2-81ca-7ea25febc110}",
+  Thunderbird: "{3550f703-e582-4d05-9a08-453d09bdfdc6}",
+  Instantbird: "{33cb9019-c295-46dd-be21-8c4936574bee}"
+};
+
+function is(name) {
+  if (!(name in ids))
+    throw new Error("Unkown Mozilla Application: " + name);
+  return ID == ids[name];
+};
+exports.is = is;
+
+function isOneOf(names) {
+  for (var i = 0; i < names.length; i++)
+    if (is(names[i]))
+      return true;
+  return false;
+};
+exports.isOneOf = isOneOf;
+
+/**
+ * Use this to check whether the given version (e.g. xulApp.platformVersion)
+ * is in the given range. Versions must be in version comparator-compatible
+ * format. See MDC for details:
+ * https://developer.mozilla.org/en/XPCOM_Interface_Reference/nsIVersionComparator
+ */
+var versionInRange = exports.versionInRange =
+function versionInRange(version, lowInclusive, highExclusive) {
+  return (vc.compare(version, lowInclusive) >= 0) &&
+         (vc.compare(version, highExclusive) < 0);
+}
+
+const reVersionRange = /^((?:<|>)?=?)?\s*((?:\d+[\S]*)|\*)(?:\s+((?:<|>)=?)?(\d+[\S]+))?$/;
+const reOnlyInifinity = /^[<>]?=?\s*[*x]$/;
+const reSubInfinity = /\.[*x]/g;
+const reHyphenRange = /^(\d+.*?)\s*-\s*(\d+.*?)$/;
+const reRangeSeparator = /\s*\|\|\s*/;
+
+const compares = {
+  "=": function (c) { return c === 0 },
+  ">=": function (c) { return c >= 0 },
+  "<=": function (c) { return c <= 0},
+  "<": function (c) { return c < 0 },
+  ">": function (c) { return c > 0 }
+}
+
+function normalizeRange(range) {
+    return range
+        .replace(reOnlyInifinity, "")
+        .replace(reSubInfinity, ".*")
+        .replace(reHyphenRange, ">=$1 <=$2")
+}
+
+/**
+ * Compare the versions given, using the comparison operator provided.
+ * Internal use only.
+ *
+ * @example
+ *  compareVersion("1.2", "<=", "1.*") // true
+ *
+ * @param {String} version
+ *  A version to compare
+ *
+ * @param {String} comparison
+ *  The comparison operator
+ *
+ * @param {String} compareVersion
+ *  A version to compare
+ */
+function compareVersion(version, comparison, compareVersion) {
+  let hasWildcard = compareVersion.indexOf("*") !== -1;
+
+  comparison = comparison || "=";
+
+  if (hasWildcard) {
+    switch (comparison) {
+      case "=":
+        let zeroVersion = compareVersion.replace(reSubInfinity, ".0");
+        return versionInRange(version, zeroVersion, compareVersion);
+      case ">=":
+        compareVersion = compareVersion.replace(reSubInfinity, ".0");
+        break;
+    }
+  }
+
+  let compare = compares[comparison];
+
+  return typeof compare === "function" && compare(vc.compare(version, compareVersion));
+}
+
+/**
+ * Returns `true` if `version` satisfies the `versionRange` given.
+ * If only an argument is passed, is used as `versionRange` and compared against
+ * `xulApp.platformVersion`.
+ *
+ * `versionRange` is either a string which has one or more space-separated
+ * descriptors, or a range like "fromVersion - toVersion".
+ * Version range descriptors may be any of the following styles:
+ *
+ * - "version" Must match `version` exactly
+ * - "=version" Same as just `version`
+ * - ">version" Must be greater than `version`
+ * - ">=version" Must be greater or equal than `version`
+ * - "<version" Must be less than `version`
+ * - "<=version" Must be less or equal than `version`
+ * - "1.2.x" or "1.2.*" See 'X version ranges' below
+ * - "*" or "" (just an empty string) Matches any version
+ * - "version1 - version2" Same as ">=version1 <=version2"
+ * - "range1 || range2" Passes if either `range1` or `range2` are satisfied
+ *
+ * For example, these are all valid:
+ * - "1.0.0 - 2.9999.9999"
+ * - ">=1.0.2 <2.1.2"
+ * - ">1.0.2 <=2.3.4"
+ * - "2.0.1"
+ * - "<1.0.0 || >=2.3.1 <2.4.5 || >=2.5.2 <3.0.0"
+ * - "2.x" (equivalent to "2.*")
+ * - "1.2.x" (equivalent to "1.2.*" and ">=1.2.0 <1.3.0")
+ */
+function satisfiesVersion(version, versionRange) {
+  if (arguments.length === 1) {
+    versionRange = version;
+    version = appInfo.version;
+  }
+
+  let ranges = versionRange.trim().split(reRangeSeparator);
+
+  return ranges.some(function(range) {
+    range = normalizeRange(range);
+
+    // No versions' range specified means that any version satisfies the
+    // requirements.
+    if (range === "")
+      return true;
+
+    let matches = range.match(reVersionRange);
+
+    if (!matches)
+      return false;
+
+    let [, lowMod, lowVer, highMod, highVer] = matches;
+
+    return compareVersion(version, lowMod, lowVer) && (highVer !== undefined
+      ? compareVersion(version, highMod, highVer)
+      : true);
+  });
+}
+exports.satisfiesVersion = satisfiesVersion;
+
+/**
+ * Ensure the current application satisfied the requirements specified in the
+ * module given. If not, an exception related to the incompatibility is
+ * returned; `null` otherwise.
+ *
+ * @param {Object} module
+ *  The module to check
+ * @returns {Error}
+ */
+function incompatibility(module) {
+  let { metadata, id } = module;
+
+  // if metadata or engines are not specified we assume compatibility is not
+  // an issue.
+  if (!metadata || !("engines" in metadata))
+    return null;
+
+  let { engines } = metadata;
+
+  if (engines === null || typeof(engines) !== "object")
+    return new Error("Malformed engines' property in metadata");
+
+  let applications = Object.keys(engines);
+
+  let versionRange;
+  applications.forEach(function(name) {
+    if (is(name)) {
+      versionRange = engines[name];
+      // Continue iteration. We want to ensure the module doesn't
+      // contain a typo in the applications' name or some unknown
+      // application - `is` function throws an exception in that case.
+    }
+  });
+
+  if (typeof(versionRange) === "string") {
+    if (satisfiesVersion(versionRange))
+      return null;
+
+    return new Error("Unsupported Application version: The module " + id +
+            " currently supports only version " + versionRange + " of " +
+            name + ".");
+  }
+
+  return new Error("Unsupported Application: The module " + id +
+            " currently supports only " + applications.join(", ") + ".")
+}
+exports.incompatibility = incompatibility;