1 files changed, 67 insertions, 2 deletions

diff --git a/glcdskin/variable.c b/glcdskin/variable.c
index 7fe0149..b300afc 100644
--- a/glcdskin/variable.c
+++ b/glcdskin/variable.c
@@ -13,18 +13,55 @@ cSkinVariable::cSkinVariable(cSkin * Parent)
     mCondition(NULL),
     mFunction(NULL),
     mDummyDisplay(mSkin),
-    mDummyObject(&mDummyDisplay)
+    mDummyObject(&mDummyDisplay),
+    mEvalMode(tevmTick),
+    mEvalInterval(0),
+    mTimestamp(0)
 {
 }
 
+bool cSkinVariable::ParseEvalMode(const std::string & Text)
+{
+  
+    if (Text == "always") {
+        mEvalMode = tevmAlways;
+    } else if (Text == "tick") {
+        mEvalMode = tevmTick;
+    } else if (Text == "switch") {
+        mEvalMode = tevmSwitch;
+    } else if (Text == "once") {
+        mEvalMode = tevmOnce;
+    } else if (Text.length() > 9 && Text.substr(0,9) == "interval:") {
+        char * e;
+        const char * t = Text.substr(9).c_str();
+        long l = strtol(t, &e, 10);
+        if ( ! (e == t || *e != '\0') && (l >= 100))
+        {
+            mEvalInterval = (int) l;
+            mEvalMode = tevmInterval;
+            return true;
+        }
+        return false;
+    } else {
+        return false;
+    } 
+    return true;
+}
+
+
 bool cSkinVariable::ParseValue(const std::string & Text)
 {
     if (isalpha(Text[0]) || Text[0] == '#' || Text[0] == '{')
     {
-        delete mFunction;
+        //delete mFunction;
         mFunction = new cSkinFunction(&mDummyObject);
         if (mFunction->Parse(Text))
         {
+            if (mEvalMode == tevmOnce) {
+                mValue = mFunction->Evaluate();
+                delete mFunction;
+                mFunction = NULL;
+            }
             //mValue = func->Evaluate();
             //delete func;
             return true;
@@ -60,6 +97,34 @@ bool cSkinVariable::ParseCondition(const std::string & Text)
     return false;
 }
 
+
+const cType & cSkinVariable::Value(void)
+{
+    if ( mTimestamp > 0 &&
+         ( ( mEvalMode == tevmTick && mTimestamp >= mSkin->GetTSEvalTick() )     ||
+           ( mEvalMode == tevmSwitch && mTimestamp >= mSkin->GetTSEvalSwitch() ) ||
+           ( mEvalMode == tevmInterval &&  (mTimestamp + (uint64_t)mEvalInterval) > mSkin->Config().Now()) 
+         )
+       )
+    {
+        return mValue;
+    }
+
+    if (mFunction != NULL) {
+        mValue = mFunction->Evaluate();
+        // should've been solved in ParseValue already, just to be sure ...
+        if (mEvalMode == tevmOnce) {
+            delete mFunction;
+            mFunction = NULL;
+        }
+    }
+    if (mEvalMode == tevmTick || mEvalMode == tevmSwitch || mEvalMode == tevmInterval) {
+        mTimestamp = mSkin->Config().Now();
+    }
+    return mValue;
+}
+
+
 cSkinVariables::cSkinVariables(void)
 {
 }