Everscale JSON Generator

A library for on-chain JSON generation in Solidity language for Everscale.

Use

• Install package:

  npm i @alvvo/everscale-json-generator

• Example of smart-contract:

  pragma ton-solidity >= 0.58.1;
  
  pragma AbiHeader time;
  pragma AbiHeader expire;
  pragma AbiHeader pubkey;
  
  import "@alvvo/everscale-json-generator/src/JSONGenerator.sol";
  
  contract Sample {
  
      constructor() public {
          tvm.accept();
      }
  
      /**
      *   @notice Sample of use this library 
      */
      function getJson() public returns(string json) {
          return(
              /**
              *   @dev Create JSON
              */
              JSONGenerator._createJSON([
                  /**
                  *   @dev Create single JSON element
                  */
                  JSONGenerator._addSingle("singleString", "text", true),
                  JSONGenerator._addSingle("singleNumber", format("{}", 0), false),
                  /**
                  *   @dev Create single-type arrays (named & unnamed)
                  */
                  JSONGenerator._addSingleTypeArray(true, "array0", ["text0", "text1"], true),
                  JSONGenerator._addSingleTypeArray(false, "array1", [format("{}", 0), format("{}", 1)], false),
                  /**
                  *   @dev Create multiple-type arrays (named & unnamed)
                  */
                  JSONGenerator._addMultipleTypeArray(true, "array2", [format("{}", 0), "text1"], [false, true]),
                  JSONGenerator._addMultipleTypeArray(false, "array3", [format("{}", 0), "text1"], [false, true]),
                  /**
                  *   @dev Create objects (named & unnamed)
                  */
                  JSONGenerator._addObject(true, "object0",
                      [
                          JSONGenerator._addSingle("singleString", "text", true),
                          JSONGenerator._addSingleTypeArray(true, "array0", ["text0", "text1"], true),
                          JSONGenerator._addMultipleTypeArray(true, "array2", [format("{}", 0), "text1"], [false, true])
                      ]
                  ),
                  JSONGenerator._addObject(false, "object1",
                      [
                          JSONGenerator._addSingle("singleString", "text", true),
                          JSONGenerator._addSingleTypeArray(true, "array0", ["text0", "text1"], true),
                          JSONGenerator._addMultipleTypeArray(true, "array2", [format("{}", 0), "text1"], [false, true])
                      ]
                  ),
                  /**
                  *   @dev Create object arrays (named & unnamed)
                  */
                  JSONGenerator._addSingleTypeArray(true, "array4", 
                      [
                          JSONGenerator._addObject(true, "object0",
                              [
                                  JSONGenerator._addSingle("singleString", "text", true),
                                  JSONGenerator._addSingleTypeArray(true, "array0", ["text0", "text1"], true)
                              ]
                          ),
                          JSONGenerator._addObject(true, "object1",
                              [
                                  JSONGenerator._addSingle("singleString", "text", true),
                                  JSONGenerator._addSingleTypeArray(true, "array0", ["text0", "text1"], true)
                              ]
                          )
                      ], 
                      false
                  ),
                  JSONGenerator._addSingleTypeArray(false, "array5", 
                      [
                          JSONGenerator._addObject(true, "object0",
                              [
                                  JSONGenerator._addSingle("singleString", "text", true),
                                  JSONGenerator._addSingleTypeArray(true, "array0", ["text0", "text1"], true)
                              ]
                          ),
                          JSONGenerator._addObject(true, "object1",
                              [
                                  JSONGenerator._addSingle("singleString", "text", true),
                                  JSONGenerator._addSingleTypeArray(true, "array0", ["text0", "text1"], true)
                              ]
                          )
                      ], 
                      false
                  )
              ])
          );
      }
  }

Description

• JSONGenerator._createJSON:

  function _createJSON(string[] elements) internal virtual returns(string json)

  This method is essential in JSON generation as it forms the final JSON format for an array of objects:
  • elements - Array of string elements.
  • json - The formated JSON.

• JSONGenerator._addSingle:

  function _addSingle(string name,
      string value,
      bool isStringValue
  ) internal virtual returns(string element)

  This function creates a single key-value pair:
  • name - The key name of the key-value pair.
  • value - The value of the key-value pair.
  • isStringValue - A flag indicating whether the value is a string or not.
  • element - String of key-value pair.

• JSONGenerator._addSingleTypeArray:

  function _addSingleTypeArray(
      bool isNamed,
      string name,
      string[] values,
      bool isStringValues
  ) internal virtual returns(string element)

  This function creates a single-type array key-value pair:
  • isNamed - The parameter specifies whether the array will have a key name or not.
  • name - The key name of the key-value pair.
  • values - The value of the key-value pair.
  • isStringValues - A flag indicating whether the value is a string or not.
  • element - String of key-value pair.

• JSONGenerator._addMultipleTypeArray:

  function _addMultipleTypeArray(
      bool isNamed,
      string name,
      string[] values,
      bool[] isStringValues
  ) internal virtual returns(string element)

  This function creates a single-type array key-value pair:
  • isNamed - The parameter specifies whether the array will have a key name or not.
  • name - The key name of the key-value pair.
  • values - The value of the key-value pair.
  • isStringValues - Arrays of flags indicating whether the value is a string or not.
  • element - String of key-value pair.

• JSONGenerator._addObject:

  function _addObject(
      bool isNamed,
      string name,
      string[] elements
  ) internal virtual returns(string element)

  The function for forming an object from elements:
  • isNamed - The parameter specifies whether the array will have a key name or not.
  • name - The key name of the key-value pair.
  • elements - Array of string elements.
  • element - String of key-value pair.