JSON Sorting

From RPTools Wiki
Jump to navigationJump to search

Following is the full macro code for the Sorting Nested JSON Objects How To. Line numbers are excluded to ease cutting and pasting.

<!--Set Up Sample Object-->

[h:troll = json.set("{}", "name", "Troll", "HD", 4, "HP", 75)]
[h:orc = json.set("{}", "name", "Orc", "HD", 3, "HP", 13)]
[h:goblin = json.set("{}", "name", "Goblin", "HD", 2, "HP", 6)]
[h:gnoll = json.set("{}", "name", "Gnoll", "HD", 3, "HP", 19)]
[h:kobold=json.set("{}", "name", "Kobold", "HD", 1, "HP", 4)]
[h:monsters = json.set("{}", "Troll", troll, "Orc", orc, "Goblin", 
                       goblin, "Gnoll", gnoll, "Kobold", kobold)]

<!--Request User Input for Sorting-->

[h:status = input(
    "whichKey|name,HD,HP|Pick Sorting Key|LIST|SELECT=0 VALUE=STRING",
    "whichDirection|A+,A-,N+,N-|Direction (A+/- for strings, N+/- for numbers!)"+

[h,if(substring(whichDirection,1)=="+"): dirString = "ascending"; dirString = "descending"]

<!--Initialize Variables-->

[h:sortKey = whichKey]
[h:sortDirection = whichDirection]
[h:sortObjContentList = json.fields(sortObj)]
[h:keyList = ""] 
[h:sortedJSON = "{}"]

<!--Get value corresponding to sortKey for each nested object and append to keyList-->

[h,foreach(item, sortObjContentList),CODE:
   [h:itemDetail = json.get(sortObj,item)]
   [h: keyList = listAppend(keyList, json.get(itemDetail, sortKey))]

<!--Sort keyList based on the direction input by the user-->

[h:keyList = listSort(keyList, sortDirection)]

Loop through keyList, and for each element, find the matching nested object(s) 
and add them to the new sortedJSON object

     [objectDetail = json.get(sortObj,object)]
     [h:sortOnValue = json.get(objectDetail, sortKey)]
     [if(sortOnValue == key): sortedJSON=json.set(sortedJSON, object, objectDetail);""]

<!--Output the Results-->

JSON Object sorted by [r:whichKey], [r:dirString]:<br>
<pre>[r:json.indent(sortedJSON, 3)]</pre>