LlJsonSetValue

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/LSL

JsonSetValue

llJsonSetValue

Summary

Function: string llJsonSetValue( string json, list specifiers, string value );

0.0	Forced Delay
10.0	Energy

Returns, if successful, a new JSON text string which is json with the value indicated by the specifiers list set to value.

If unsuccessful (usually because of specifying an out of range array index) it should, and usually will, return JSON_INVALID. However this is currently, 8/20/2013, broken at depths lower than the topmost level, where it will silently invalidate the return string, so be careful! The return string should always be checked for JSON_INVALID before overwriting the original Json text.

An "out of range array index" is defined to be any Integer specifier greater than the length of an existing array at that level within the Json text or greater than 0 (zero) at a level an array doesn't exist.

A special specifier, JSON_APPEND, is accepted which appends the value to the end of the array at the specified level. Care should be taken- if that level is not an array, the existing Value there will be overwritten and replaced with an array containing value at it's first (0) index.

Contrary to LSL_List, negative indexing of Json arrays is not supported.

If an existing "Key" is specified at that level, its Value will be overwritten by value, otherwise a new "Key":Value pair will be formed within the Json object.

If value is JSON_TRUE, JSON_FALSE or JSON_NULL, the Value set will be the bare words 'true', 'false' or 'null', respectively, at the specified location within json.
Returns a string

• string	json
• list	specifiers
• string	value

Specification

See Json_usage_in_LSL

Examples

<lsl>string jsonText = "[9,\"<1,1,1>\",false,{\"A\":8,\"Z\":9}]";

default {

state_entry() { llOwnerSay("Json Text: " + jsonText); // [9,"<1,1,1>",false,{"A":8,"Z":9}] }

touch_end(integer n) { string tempText;

////////////// // Changing Values within the Json text //////////////

// Change the first value in the array to 10 tempText = llJsonSetValue(jsonText, [0], "10"); llOwnerSay("( 1): " + tempText); // [10,"<1,1,1>",false,{"A":8,"Z":9}]

//Change the third value in the array to 'true' tempText = llJsonSetValue(jsonText, [2], JSON_TRUE); llOwnerSay("( 2): " + tempText); // [9,"<1,1,1>",true,{"A":8,"Z":9}]

// Change the value of "A" within the Json object to 3 tempText = llJsonSetValue(jsonText, [3, "A"], "3"); llOwnerSay("( 3): " + tempText); // [9,"<1,1,1>",false,{"A":3,"Z":9}]

////////////// // Adding a Value or new "Key":Value pair within the Json text //////////////

// Add the Value "Hello" to the end of the array // NOTE: One cannot insert, only add to the end tempText = llJsonSetValue(jsonText, [JSON_APPEND], "Hello"); llOwnerSay("( 4): " + tempText); // [9,"<1,1,1>",false,{"A":8,"Z":9},"Hello"]

// Add the "Key":Value pair "B":10 to the object tempText = llJsonSetValue(jsonText, [3, "B"], "10"); llOwnerSay("( 5): " + tempText); // [9,"<1,1,1>",false,{"A":8,"B":10,"Z":9}]

////////////// // Things to look out for when modifying Json text // (*** Be careful when using this function! ***) //////////////

// Out of bounds array assignments // Defined as attempting to add a Value to a position ... // ...greater than the length of the array (which may be 0) // JSON_APPEND is ALWAYS the preferred way to add to an array tempText = llJsonSetValue(jsonText, [5], "10"); llOwnerSay("( 6): " + llEscapeURL(tempText)); // %EF%B7%90 (URL escaped JSON_INVALID)

// BUT, this works, since it is in bounds // (eqivalent to JSON_APPEND in this case) tempText = llJsonSetValue(jsonText, [4], "10"); llOwnerSay("( 7): " + tempText); // [9,"<1,1,1>",false,{"A":8,"Z":9},10]

// Careless formation of new arrays // ( the 4 and all subsequent 0's are all in bounds.) tempText = llJsonSetValue(jsonText, [4,0,0,0], "10"); llOwnerSay("( 8): " + tempText); // [9,"<1,1,1>",false,{"A":8,"Z":9},[[[10]]]]

// Overwriting an object with an array // Mistaken use of JSON_APPEND on an object tempText = llJsonSetValue(jsonText, [3, JSON_APPEND], "10"); llOwnerSay("( 9): " + tempText); // [9,"<1,1,1>",false,[10]]

// Careless formation of new objects // NOTE: "Key" assignemts will NEVER result in a return of JSON_INVALID! tempText = llJsonSetValue(jsonText, [3, "W", "X"], "10"); llOwnerSay("(10): " + tempText); // [9,"<1,1,1>",false,{"A":8,"W":{"X":10},"Z":9}] tempText = llJsonSetValue(jsonText, [3, "W", "X", "Y"], "10");

llOwnerSay("(11): " + tempText); // [9,"<1,1,1>",false,{"A":8,"W":{"X":{"Y":10

Deep Notes

Signature
function string llJsonSetValue( string json, list specifiers, string value );

,"Z":9}]

// Overwriting an array with an object tempText = llJsonSetValue(jsonText, ["X"], "10"); llOwnerSay("(12): " + tempText); // {"X":10}

////////////// // Special case considerations //////////////

// There is currently a bug (BUG-3692) where, instead of JSON_INVALID // being returned, if the out of bounds index is at a lower level than // the topmost (root) level, a non-compliant Json text will be formed tempText = llJsonSetValue(jsonText, [1, 7], "Disappearing Text"); // Note the "empty" second position in resulting array llOwnerSay("(13): " + tempText); // [9,,false,{"A":8,"Z":9}]

// though there is no way to directly delete a "Key":Value pair // nor remove a Value from an array, // The use of JSON_NULL may prove adequate tempText = llJsonSetValue(jsonText, [3, "A"], JSON_NULL); llOwnerSay("(14): " + tempText); // [9,"<1,1,1>",false,{"A":null,"Z":9}]

// if a Json text object has been formed with llList2Json() // that contains one or more duplicated "Keys", (allowable // but NOT recommended!) ANY change // made to that object will correct the condition, // with all but the last such "Key" being removed tempText = llList2Json(JSON_OBJECT, ["A", 1, "A", 2, "A", 3, "B", 4, "B", 4]); // both Keys "A" and "B" are duplicated llOwnerSay("(15): " + tempText); // {"A":1,"A":2,"A":3,"B":4,"B":4} // Only the last value of the duplications is accessable though llOwnerSay("(16): " + llJsonGetValue(tempText, ["A"])); // 3 // Condition corrected by adding a "Key":Value pair... llOwnerSay("(17): " + llJsonSetValue(tempText, ["Z"], "5")); // {"A":3,"B":4,"Z":5} // ..or by changing a Value llOwnerSay("(18): " + llJsonSetValue(tempText, ["A"], "5")); //{"A":5,"B":4} } }</lsl>

|caveats= |helpers |also_functions=|-style="vertical-align:top;" | style="color:gray;" |•  | llList2Json | style="color:gray;" | | | |-style="vertical-align:top;" | style="color:gray;" |•  | llJson2List | style="color:gray;" | | | |-style="vertical-align:top;" | style="color:gray;" |•  | llJsonGetValue | style="color:gray;" | | | |-style="vertical-align:top;" | style="color:gray;" |•  | llJsonValueType | style="color:gray;" | | | |also_events |also_tests |also_articles=|-style="vertical-align:top;" | style="color:gray;" |•  | Typecast | style="color:gray;" | | | |notes= |permission |negative_index |sort=JsonSetValue |cat1=List |cat2=String |cat3=Data Conversion |cat4=JSON |history = Date of Release 20/05/2013 }}