Example of parse whole json answer.

[Craig Dillabaugh via Digitalmars-d-learn]

On Thursday, 24 April 2014 at 12:17:42 UTC, Nicolas wrote:
> I have a json string saved in a file ( example of json tweeter 
> answer: 
> https://dev.twitter.com/docs/api/1.1/get/statuses/user_timeline 
> ). I am trying to read the whole json answer and print specific 
> data ("created_at", "retweet_count", ..) . I am new at D 
> Programming language and i was wondering if someone can help me 
> or post some example that show how to parse json strings using 
> std.json library. Thanks in advance.

Here is something to get you started.  The initial version of 
this code was from Ali Cehreli, I can't remember what 
modifications are mine, or if this is all straight form Ali.

If you intend to do any serious work with Json, I highly 
recommend you check out Vibe.d (www.vibed.org) - more stuff to 
learn but its JSON capabilities are awesome compared to what 
std.json gives you.

import std.stdio;
import std.json;
import std.conv;
import std.file;

/**
   Ali's example.
*/
struct Employee
{
	string firstName;
	string lastName;
}

void readEmployees( string employee_json_string )
{

	JSONValue[string] document = 
parseJSON(employee_json_string).object;
	JSONValue[] employees = document["employees"].array;
	
	foreach (employeeJson; employees) {
		JSONValue[string] employee = employeeJson.object;
		
		string firstName = employee["firstName"].str;
		string lastName = employee["lastName"].str;
		
		auto e = Employee(firstName, lastName);
		writeln("Constructed: ", e);
	}	
}

void main()
{
	// Assumes UTF-8 file
	auto content =
		`{
		  "employees": [
		    { "firstName":"Walter" , "lastName":"Bright" },
		    { "firstName":"Andrei" , "lastName":"Alexandrescu" },
		    { "firstName":"Celine" , "lastName":"Dion" }
		  ]
		}`;
	
	readEmployees( content );
	
	//Or to read the same thing from a file
	readEmployees( readText( "employees.json" ) );

}