A complete JSON formatter that takes a minified string and pretty-prints it with proper indentation.

ID: 1382

See: Project: Building a JSON Formatter and Minifier 
				
					using uCalcSoftware;

var uc = new uCalc();
using (var t = new uCalc.Transformer(uc)) {
   // 1. Define state variable in the uCalc instance.
   uc.DefineVariable("indent = 0");

   // 2. Define the transformation rules.
   // Note: '{', '}', '[', ']' are escaped with quotes to be treated as literals.

   // Rule for '{' and '[': Add newline, increment indent, add indent string.
   t.FromTo("{ '{' | '[' }", "{@Self}{@nl}{@Exec: indent++}{@Eval: '  ' * indent}");

   // Rule for '}' and ']': Add newline, decrement indent, add indent string.
   t.FromTo("{ '}' | ']' }", "{@nl}{@Exec: indent--}{@Eval: '  ' * indent}{@Self}");

   // Rule for ',': Add newline and current indent string.
   t.FromTo(",", ",{@nl}{@Eval: '  ' * indent}");

   // Rule for ':': Add a space after it for readability.
   t.FromTo(":", ": ");

   // 3. Define the minified input string.
   var minifiedJson = """
{"id":123,"name":"Example","tags":["A","B"],"active":true}
""";

   // 4. Run the transformation and print the result.
   Console.WriteLine(t.Transform(minifiedJson));
}
				
			
{
  "id": 123,
  "name": "Example",
  "tags": [
    "A",
    "B"
  ],
  "active": true
}
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					#include <iostream>
#include "uCalc.h"

using namespace std;
using namespace uCalcSoftware;

int main() {
   uCalc uc;
   {
      uCalc::Transformer t(uc);
      t.Owned(); // Causes t to be released when it goes out of scope
      // 1. Define state variable in the uCalc instance.
      uc.DefineVariable("indent = 0");

      // 2. Define the transformation rules.
      // Note: '{', '}', '[', ']' are escaped with quotes to be treated as literals.

      // Rule for '{' and '[': Add newline, increment indent, add indent string.
      t.FromTo("{ '{' | '[' }", "{@Self}{@nl}{@Exec: indent++}{@Eval: '  ' * indent}");

      // Rule for '}' and ']': Add newline, decrement indent, add indent string.
      t.FromTo("{ '}' | ']' }", "{@nl}{@Exec: indent--}{@Eval: '  ' * indent}{@Self}");

      // Rule for ',': Add newline and current indent string.
      t.FromTo(",", ",{@nl}{@Eval: '  ' * indent}");

      // Rule for ':': Add a space after it for readability.
      t.FromTo(":", ": ");

      // 3. Define the minified input string.
      auto minifiedJson = R"({"id":123,"name":"Example","tags":["A","B"],"active":true})";

      // 4. Run the transformation and print the result.
      cout << t.Transform(minifiedJson) << endl;
   }
}
				
			
{
  "id": 123,
  "name": "Example",
  "tags": [
    "A",
    "B"
  ],
  "active": true
}
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					Imports System
Imports uCalcSoftware
Public Module Program
   Public Sub Main()
      Dim uc As New uCalc()
      Using t As New uCalc.Transformer(uc)
         '// 1. Define state variable in the uCalc instance.
         uc.DefineVariable("indent = 0")
         
         '// 2. Define the transformation rules.
         '// Note: '{', '}', '[', ']' are escaped with quotes to be treated as literals.
         
         '// Rule for '{' and '[': Add newline, increment indent, add indent string.
         t.FromTo("{ '{' | '[' }", "{@Self}{@nl}{@Exec: indent++}{@Eval: '  ' * indent}")
         
         '// Rule for '}' and ']': Add newline, decrement indent, add indent string.
         t.FromTo("{ '}' | ']' }", "{@nl}{@Exec: indent--}{@Eval: '  ' * indent}{@Self}")
         
         '// Rule for ',': Add newline and current indent string.
         t.FromTo(",", ",{@nl}{@Eval: '  ' * indent}")
         
         '// Rule for ':': Add a space after it for readability.
         t.FromTo(":", ": ")
         
         '// 3. Define the minified input string.
         Dim minifiedJson = "{""id"":123,""name"":""Example"",""tags"":[""A"",""B""],""active"":true}"
         
         '// 4. Run the transformation and print the result.
         Console.WriteLine(t.Transform(minifiedJson))
      End Using
   End Sub
End Module
				
			
{
  "id": 123,
  "name": "Example",
  "tags": [
    "A",
    "B"
  ],
  "active": true
}
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