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(Perl) Using Pre-defined JSON Templates

Demonstrates how to predefine a JSON template, and then use it to emit JSON with variable substitutions.

Note: This example requires Chilkat v9.5.0.67 or greater.

Chilkat Perl Downloads

Perl Module for Windows, Linux, Alpine Linux,
MAC OS X, Solaris, FreeBSD, OpenBSD,
Raspberry Pi and other single board computers

use chilkat();

#  One way to create JSON is to do it in a straightforward manner:
$json = chilkat::CkJsonObject->new();
$json->put_EmitCompact(0);
$json->UpdateString("id","0001");
$json->UpdateString("type","donut");
$json->UpdateString("name","Cake");
$json->UpdateString("image.url","images/0001.jpg");
$json->UpdateInt("image.width",200);
$json->UpdateInt("image.height",200);
$json->UpdateString("thumbnail.url","images/thumbnails/0001.jpg");
$json->UpdateInt("thumbnail.width",32);
$json->UpdateInt("thumbnail.height",32);
print $json->emit() . "\r\n";

#  The JSON created by the above code:

#  	{
#  	  "id": "0001",
#  	  "type": "donut",
#  	  "name": "Cake",
#  	  "image": {
#  	    "url": "images/0001.jpg",
#  	    "width": 200,
#  	    "height": 200
#  	  },
#  	  "thumbnail": {
#  	    "url": "images/thumbnails/0001.jpg",
#  	    "width": 32,
#  	    "height": 32
#  	  }
#  	}

#  An alternative is to predefine a template, and then use it to emit with variable substitutions.
#  For example:

$jsonTemplate = chilkat::CkJsonObject->new();
$jsonTemplate->UpdateString("id","{$id}");
$jsonTemplate->UpdateString("type","donut");
$jsonTemplate->UpdateString("name","{$name}");
$jsonTemplate->UpdateString("image.url","{$imageUrl}");
#  The "i." indicates that it's an integer variable.
$jsonTemplate->UpdateString("image.width","{$i.imageWidth}");
$jsonTemplate->UpdateString("image.height","{$i.imageHeight}");
$jsonTemplate->UpdateString("thumbnail.url","{$thumbUrl}");
$jsonTemplate->UpdateString("thumbnail.width","{$i.thumbWidth}");
$jsonTemplate->UpdateString("thumbnail.height","{$i.thumbHeight}");
#  Give this template a name.
$jsonTemplate->Predefine("donut");

#  --------------------------------------------------------------------------
#  OK, the template is defined.  Defining a template can be done once
#  at the start of your program, and you can discard the jsonTemplate object (it
#  doesn't need to stick around..)

#  Now we can create instances of the JSON object by name:
$jsonDonut = chilkat::CkJsonObject->new();
$jsonDonut->put_EmitCompact(0);
$jsonDonut->LoadPredefined("donut");
print $jsonDonut->emit() . "\r\n";

#  The output is this:

#  	{
#  	  "id": "{$id}",
#  	  "type": "donut",
#  	  "name": "{$name}",
#  	  "image": {
#  	    "url": "{$imageUrl}",
#  	    "width": "{$i.imageWidth}",
#  	    "height": "{$i.imageHeight}"
#  	  },
#  	  "thumbnail": {
#  	    "url": "{$thumbUrl}",
#  	    "width": "{$i.thumbWidth}",
#  	    "height": "{$i.thumbHeight}"
#  	  }
#  	}

#  Finally, we can substitute variables like this:
$donutValues = chilkat::CkHashtable->new();
$donutValues->AddStr("id","0001");
$donutValues->AddStr("name","Cake");
$donutValues->AddStr("imageUrl","images/0001.jpg");
$donutValues->AddInt("imageWidth",200);
$donutValues->AddInt("imageHeight",200);
$donutValues->AddStr("thumbUrl","images/thumbnails/0001.jpg");
$donutValues->AddInt("thumbWidth",32);
$donutValues->AddInt("thumbHeight",32);

#  Emit with variable substitutions:
$omitEmpty = 1;
print $jsonDonut->emitWithSubs($donutValues,$omitEmpty) . "\r\n";

#  Output:

#  	{
#  	  "id": "0001",
#  	  "type": "donut",
#  	  "name": "Cake",
#  	  "image": {
#  	    "url": "images/0001.jpg",
#  	    "width": 200,
#  	    "height": 200
#  	  },
#  	  "thumbnail": {
#  	    "url": "images/thumbnails/0001.jpg",
#  	    "width": 32,
#  	    "height": 32
#  	  }
#  	}

#  Change some of the values:
$donutValues->AddStr("id","0002");
$donutValues->AddStr("imageUrl","images/0002.jpg");
$donutValues->AddStr("thumbUrl","images/thumbnails/0002.jpg");

print $jsonDonut->emitWithSubs($donutValues,$omitEmpty) . "\r\n";

#  Output:

#  	{
#  	  "id": "0002",
#  	  "type": "donut",
#  	  "name": "Cake",
#  	  "image": {
#  	    "url": "images/0002.jpg",
#  	    "width": 200,
#  	    "height": 200
#  	  },
#  	  "thumbnail": {
#  	    "url": "images/thumbnails/0002.jpg",
#  	    "width": 32,
#  	    "height": 32
#  	  }
#  	}

 

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