From 2bb3fcb258072c7fa2ca4d057d8180d5cf11b8cf Mon Sep 17 00:00:00 2001
From: Vadim Lopatin <coolreader.org@gmail.com>
Date: Fri, 27 Feb 2015 12:18:44 +0300
Subject: [PATCH] settings improvements: allow foreach iteration over arrays
 and maps

---
 src/dlangui/core/settings.d | 52 +++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/src/dlangui/core/settings.d b/src/dlangui/core/settings.d
index 69b4d1c4..354089bd 100644
--- a/src/dlangui/core/settings.d
+++ b/src/dlangui/core/settings.d
@@ -600,6 +600,58 @@ final class Setting {
         return list;
     }
 
+    /// to iterate using foreach
+    int opApply(int delegate(ref Setting)dg) {
+        int result = 0;
+        if (_type == SettingType.ARRAY) {
+            for(int i = 0; i < _store.array.list.length; i++) {
+                result = dg(_store.array.list[i]);
+                if (result)
+                    break;
+            }
+        } else if (_type == SettingType.OBJECT) {
+            for(int i = 0; i < _store.map.list.length; i++) {
+                result = dg(_store.map.list[i]);
+                if (result)
+                    break;
+            }
+        }
+        return result;
+    }
+
+    /// to iterate over OBJECT using foreach(key, value; map)
+    int opApply(int delegate(ref string, ref Setting)dg) {
+        int result = 0;
+        if (_type == SettingType.OBJECT) {
+            for(int i = 0; i < _store.map.list.length; i++) {
+                string key = _store.map.keyByIndex(i);
+                result = dg(key, _store.map.list[i]);
+                if (result)
+                    break;
+            }
+        }
+        return result;
+    }
+
+    /// to iterate using foreach_reverse
+    int opApplyReverse(int delegate(ref Setting)dg) {
+        int result = 0;
+        if (_type == SettingType.ARRAY) {
+            for(int i = cast(int)_store.array.list.length - 1; i >= 0; i--) {
+                result = dg(_store.array.list[i]);
+                if (result)
+                    break;
+            }
+        } else if (_type == SettingType.OBJECT) {
+            for(int i = cast(int)_store.map.list.length - 1; i >= 0; i--) {
+                result = dg(_store.map.list[i]);
+                if (result)
+                    break;
+            }
+        }
+        return result;
+    }
+
     static long parseLong(inout string v, long defValue = 0) {
         int len = cast(int)v.length;
         if (len == 0)