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gaia/apps/calendar/js/common/binsearch.js

@@ -0,0 +1,57 @@
+/**
+ * Binary search utilities taken /w permission from :asuth
+ */
+define(function(require, exports) {
+'use strict';
+
+exports.find = function(list, seekVal, cmpfunc, aLow, aHigh) {
+  var low = ((aLow === undefined) ? 0 : aLow),
+      high = ((aHigh === undefined) ? (list.length - 1) : aHigh),
+      mid, cmpval;
+
+  while (low <= high) {
+    mid = low + Math.floor((high - low) / 2);
+    cmpval = cmpfunc(seekVal, list[mid]);
+    if (cmpval < 0) {
+      high = mid - 1;
+    } else if (cmpval > 0) {
+      low = mid + 1;
+    } else {
+      return mid;
+    }
+  }
+
+  return null;
+};
+
+exports.insert = function(list, seekVal, cmpfunc) {
+  if (!list.length) {
+    return 0;
+  }
+
+  var low = 0, high = list.length - 1,
+      mid, cmpval;
+
+  while (low <= high) {
+    mid = low + Math.floor((high - low) / 2);
+    cmpval = cmpfunc(seekVal, list[mid]);
+
+    if (cmpval < 0) {
+      high = mid - 1;
+    } else if (cmpval > 0) {
+      low = mid + 1;
+    } else {
+      break;
+    }
+  }
+
+  if (cmpval < 0) {
+    return mid; // insertion is displacing, so use mid outright.
+  } else if (cmpval > 0) {
+    return mid + 1;
+  } else {
+    return mid;
+  }
+};
+
+});