Getting underlying struct for parseJSON

Alexey H via Digitalmars-d-learn digitalmars-d-learn at puremagic.com
Tue Feb 28 12:27:25 PST 2017


Hello, guys!

I'm working on a project that involves parsing of huge JSON 
datasets in real-time.
Just an example of what i'm dealing with is here:

https://gist.githubusercontent.com/gdmka/125014058bb7d7f01b867fac56300a61/raw/f0c6b5be5fb01b16dd83f07c577b72f76f72c855/data.json

Can't think of any tools other that D or Go to solve this problem.

My experience of solving the problem with Go has led me to 
Stackoverflow and the community out there seemed too reluctant to 
help so i assumed that the language cannot handle such a set of 
operations on complex datastructures.

My experience with D was like a charm. Where i have had ~100 
lines of Go code i did the same  with 12 in with D. But, 
nevertheless, i did some profiling (unfortunately on OS X) and 
saw much heavier CPU usage with D than Go. Probably because the 
Go solution was unpacking all the data strictly to struct.

So, my real question is: can i actually, by any change, get the 
description of an underlying struct that the call to parseJSON 
generates?

The goers have this thing https://mholt.github.io/json-to-go/ to 
generate structs from JSON automatically.

Since D easily parses JSON by type inference, i assume it builds 
a JSONValue struct which holds all the fields and the data.

If it is possible, then i can build a similar JSON to D tool just 
for the sake of saving people's time and patience.







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