1 files changed, 112 insertions, 0 deletions
diff --git a/toolkit/jetpack/mozilla-toolkit-versioning/index.js b/toolkit/jetpack/mozilla-toolkit-versioning/index.js
new file mode 100644
index 000000000..2f607c880
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+++ b/toolkit/jetpack/mozilla-toolkit-versioning/index.js
@@ -0,0 +1,112 @@
+/* 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/. */
+
+var versionParse = require('./lib/utils').versionParse;
+
+var COMPARATORS = ['>=', '<=', '>', '<', '=', '~', '^'];
+
+exports.parse = function (input) {
+  input = input || '';
+  input = input.trim();
+  if (!input)
+    throw new Error('`parse` argument must be a populated string.');
+
+  // Handle the "*" case
+  if (input === "*") {
+    return { min: undefined, max: undefined };
+  }
+
+  var inputs = input.split(' ');
+  var min;
+  var max;
+
+  // 1.2.3 - 2.3.4
+  if (inputs.length === 3 && inputs[1] === '-') {
+    return { min: inputs[0], max: inputs[2] };
+  }
+
+  inputs.forEach(function (input) {
+    var parsed = parseExpression(input);
+    var version = parsed.version;
+    var comparator = parsed.comparator;
+
+    // 1.2.3
+    if (inputs.length === 1 && !comparator)
+      min = max = version;
+
+    // Parse min
+    if (~comparator.indexOf('>')) {
+      if (~comparator.indexOf('='))
+        min = version; // >=1.2.3
+      else
+        min = increment(version); // >1.2.3
+    }
+    else if (~comparator.indexOf('<')) {
+      if (~comparator.indexOf('='))
+        max = version; // <=1.2.3
+      else
+        max = decrement(version); // <1.2.3
+    }
+  });
+
+  return {
+    min: min,
+    max : max
+  };
+};
+
+function parseExpression (input) {
+  for (var i = 0; i < COMPARATORS.length; i++)
+    if (~input.indexOf(COMPARATORS[i]))
+      return {
+        comparator: COMPARATORS[i],
+        version: input.substr(COMPARATORS[i].length)
+      };
+  return { version: input, comparator: '' };
+}
+
+/**
+ * Takes a version string ('1.2.3') and returns a version string
+ * that'll parse as one less than the input string ('1.2.3.-1').
+ *
+ * @param {String} vString
+ * @return {String}
+ */
+function decrement (vString) {
+  return vString + (vString.charAt(vString.length - 1) === '.' ? '' : '.') + '-1';
+}
+exports.decrement = decrement;
+
+/**
+ * Takes a version string ('1.2.3') and returns a version string
+ * that'll parse as greater than the input string by the smallest margin
+ * possible ('1.2.3.1').
+ * listed as number-A, string-B, number-C, string-D in
+ * Mozilla's Toolkit Format.
+ * https://developer.mozilla.org/en-US/docs/Toolkit_version_format
+ *
+ * @param {String} vString
+ * @return {String}
+ */
+function increment (vString) {
+  var match = versionParse(vString);
+  var a = match[1];
+  var b = match[2];
+  var c = match[3];
+  var d = match[4];
+  var lastPos = vString.length - 1;
+  var lastChar = vString.charAt(lastPos);
+
+  if (!b) {
+    return vString + (lastChar === '.' ? '' : '.') + '1';
+  }
+  if (!c) {
+    return vString + '1';
+  }
+  if (!d) {
+    return vString.substr(0, lastPos) + (++lastChar);
+  }
+  return vString.substr(0, lastPos) + String.fromCharCode(lastChar.charCodeAt(0) + 1);
+}
+exports.increment = increment;