Difference between revisions of "LlGetListEntryType"

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|spec
|spec
|caveats=
|caveats=
If a vector is stored in a list as "<7,5,0>" (as opposed to <7,5,0>), 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 could be from a string value.
* 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
 
|constants=
|constants=
{{LSL_Constants/ListEntryType}}
{{LSL_Constants/ListEntryType}}
|examples
|examples
|helpers
|helpers=This function has two primary uses: serializing a list to a string, debugging.
<lsl>//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;
}
</lsl>
For a more complex and robust list (de)serializer see [[TightList|TightListType]].
|also_functions={{LSL DefineRow||[[llList2Float]]|}}
|also_functions={{LSL DefineRow||[[llList2Float]]|}}
{{LSL DefineRow||[[llList2Integer]]|}}
{{LSL DefineRow||[[llList2Integer]]|}}

Revision as of 13:37, 24 April 2009

Summary

Function: integer llGetListEntryType( list src, integer index );

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

• list src – List containing the element of interest.
• integer index – Index of the element of interest.

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

Specification

Index Positive Negative
First 0 -length
Last length - 1 -1

Indexes

  • Positive indexes count from the beginning, the first item being indexed as 0, the last as (length - 1).
  • Negative indexes count from the far end, the first item being indexed as -length, the last as -1.

Type Description
TYPE_INTEGER 1 integer
TYPE_FLOAT 2 float
TYPE_STRING 3 string
TYPE_KEY 4 key
TYPE_VECTOR 5 vector
TYPE_ROTATION 6 rotation
TYPE_INVALID 0 none

Caveats

  • 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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Examples

Useful Snippets

This function has two primary uses: serializing a list to a string, debugging. <lsl>//A simple list serializer and deserializer. //This will round floats to 6 decimal places and not handle strings with embedded "

See Also

Functions

•  llList2Float
•  llList2Integer
•  llList2Key
•  llList2Rot
•  llList2String
•  llList2Vector

Articles

•  Negative Index

Deep Notes

Search JIRA for related Issues

Signature

function integer llGetListEntryType( list src, integer index );
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