LlGetListEntryType

Returns an integer that is the type of the entry index in src.

index supports negative indexes.
If index describes a location not in src then TYPE_INVALID is returned.

Indexes

• If index is out of bounds the script continues to execute without an error message.
• If a vector is stored in a list as "<7,5,0>" (as a string type, as opposed to <7,5,0> which is a vector type), its type will be returned as TYPE_STRING, not TYPE_VECTOR. The same applies for "1" being returned as a string instead of an integer, etc. There is no easy way to guess what the type should be from a string value. The users intent may not be obvious

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This function has two primary uses: serializing a list to a string, debugging.

//A simple list serializer and deserializer.
//This will round floats to 6 decimal places and not handle strings with embedded "|" characters
 
string serialize(list input){
    integer len = ~llGetListLength(input);
    string build = (string)(~len);
    while(++len){
        build += "|" + llGetListEntryType(input, len) + 
                 "=" + llList2String(input, len);//very unsafe, list item could contain "|" character!!!
    }
    return build;
}
 
list deserialize(string input){
    integer len = ~(integer)input;//the length is everything before the "|", which is where (integer) stops
    list build = [];
    list pair = llParseString2List(input, ["|"], []);
    string value;
    list replace;
    while(++len){
        integer type = (integer)(value = llList2String(pair, len));
        value = llDeleteSubString(value, 0, llSubStringIndex(value, "="))
        if(TYPE_INTEGER == type)
            replace = [(integer)value];
        else if(TYPE_FLOAT == type)
            replace = [(float)value];
        else if(TYPE_STRING == type)
            replace = [value];
        else if(TYPE_KEY == type)
            replace = [(key)value];
        else if(TYPE_VECTOR == type)
            replace = [(vector)value];
        else if(TYPE_ROTATION == type)
            replace = [(rotation)value];
        pair = llListReplaceList(pair, replace, len, len);
    }
    return pair;
}
 

For a more complex and robust list (de)serializer see TightListType.

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