Iterate JSON during compile-time.
Tariq Siddiqui
m.tariqsiddiqui at gmail.com
Sat Apr 10 16:46:34 UTC 2021
On Saturday, 10 April 2021 at 14:03:55 UTC, Tariq Siddiqui wrote:
> Hello everyone,
>
> I want to iterate over the JSON using CTFE. I have tried both
> std.json and vibe.data.json, but there is no luck. I am not
> sure what I am missing.
> ```d
> import std.stdio;
> import std.json;
> import std.array;
> import vibe.data.json;
>
> void main()
> {
> enum string config = `{ "ModelNames": [ "Bank", "Biller",
> "Aggregator" ] }`;
> const auto c1 = parseJSON(config);
> immutable auto c2 = parseJsonString(config);
>
> foreach (key; c1["ModelNames"].array)
> writeln(key.get!string);
>
> foreach (key; c2["ModelNames"])
> writeln(key.get!string);
>
> // static foreach (key; c1["ModelNames"].array)
> // pragma(msg, key.get!string);
>
> // static foreach (key; c2["ModelNames"])
> // pragma(msg, key.get!string);
> }
> ```
Thanks to Vladimir, the problem is solved by his advice.
```d
import std.algorithm.iteration;
import std.stdio;
import std.json;
import std.array;
import vibe.data.json;
void main()
{
enum string config = `{ "ModelNames": [ "Bank", "Biller",
"Aggregator" ] }`;
immutable auto c1 = parseJSON(config);
immutable auto c2 = parseJsonString(config);
static foreach (key; c1["ModelNames"].array.map!(item =>
item).array)
pragma(msg, key.get!string);
static foreach (key; c2["ModelNames"].array.map!(item =>
item).array)
pragma(msg, key.get!string);
}
```
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