Guidelines on how to dissect a JavaScript code or array using C#

Upon receiving a web request for a JavaScript file, a JavaScript Snippet was retrieved as the response that needs to be parsed in C#.

The snippet contains data like:

sDt[1647110]=['SVK U19 A','D43A71','Jupie Podlavice Badin(U19)','TJ Straza(U19)','','',' / '
,'','',114745,114746,1,'',0,0,0,1012,1,'','',''];sDt[1647108]=['SVK U19 A','D43A71','Kysucke Nove Mesto(U19)',
'MFK Lokomotiva Zvolen(U19)','','',' / ','','',114741,114742,1,'',0,0,0,1012,1,'','',''];
sDt[1647109]=['SVK U19 A', /* Many more similar entries followed by */ ;WLID[1623901]=1;
WLID[1623902]=1;WLID[1623903]=1;WLID[1637686]=1;
WLID[1637692]=1;WLID[1637687]=1;WLID[1637688]=1;WLID[1637685]= /* ending with */ 
var ORD = [1647110,1647108,1647109,1647133,1645669,1647122,1626152,1647251,1646643,
1647130,1646685,1 ... ];

This doesn't conform to a standard JSON array format. The challenge is to parse this efficiently. Initially, an attempt was made using String.Split, which proved to be slow and unstable.

The goal is to extract the array behind each sDt[Identifier] along with its corresponding Identifier using Json.Net, while disregarding other elements like WLID or var ORD.

If you have any suggestions on how to tackle this problem efficiently, please share. Your help is much appreciated!

javascriptc#arraysjson

Answer №1

To properly dissect the request, one must meticulously analyze each token without any other aids or shortcuts. It's imperative to follow this process thoroughly. Have you considered simply sending the JSON instead? When parsing, here's a suggested method: Carefully examine the entire request. If you encounter an opening square bracket '[', ensure that you are not inside a string at that moment. You can achieve this by setting a flag when encountering a '"', and unsetting it after another '"'. When not within a string, subsequent tokens will either be identifiers or content, which can be easily determined. For numbers, the identifier extends until reaching ']'. For non-numeric values, treat them as content to be parsed with Json.Net. Note the positions of '[' and ']' to extract the necessary substring for Json.Net. Should you encounter a ';', make sure to skip over the sections labeled WLID and ORD if not inside a string. Overall, this process has a time complexity of O(n * m) where n represents the number of tokens and m is the length of the longest content string. By handling the content parsing manually (rather than relying on Json.Net), the time complexity could potentially be reduced to O(n).

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