swaggerGen.js

function convert() {
  'use strict';
  // ---- Global variables ----
  var inJSON, outSwagger, tabCount, indentator;
 	
  // ---- Functions definitions ----
  function changeIndentation (count) {
	/* 
	Assign 'indentator' a string beginning with newline and followed by 'count' tabs
	Updates variable 'tabCount' with the number of tabs used
	Global variables updated: 
	-identator 
	-tabcount
	*/

    let i;
    if (count >= tabCount) {
      i = tabCount
    } else {
      i = 0;
      indentator = '\n';
    }
    for ( ; i < count; i++) {
      indentator += '\t';
    }
    //Update tabCount
    tabCount = count;
  };

  function conversorSelection (obj) {
	/* 
    Selects which conversion method to call based on given obj
	Global variables updated: 
    -outSwagger
    */

   	changeIndentation(tabCount+1);
	if (typeof obj === "number") { //attribute is a number
      convertNumber(obj);
    } else if (Object.prototype.toString.call(obj) === '[object Array]') { //attribute is an array
      convertArray(obj[0]);
    } else if (typeof obj === "object") { //attribute is an object
      convertObject(obj);
    } else if (typeof obj === "string") { //attribute is a string
      convertString(obj);
    } else if (typeof obj === "boolean") { // attribute is a boolean
      outSwagger += indentator + '"type": "boolean"';
    } else { // not a valid Swagger type
      alert ('Property type "'+typeof obj+'" not valid for Swagger definitions');
    }
   	changeIndentation(tabCount-1);
  };

  function convertNumber (num) {
    /* 
    Append to 'outSwagger' string with Swagger schema attributes relative to given number
    Global variables updated: 
    -outSwagger
    */

	if (num % 1 === 0 && !document.getElementById("noInt").checked) {
        outSwagger += indentator + '"type": "integer",';
        if (num < 2147483647 && num > -2147483647) {
          outSwagger += indentator + '"format": "int32"';
        } else if (Number.isSafeInteger(num)) {
          outSwagger += indentator + '"format": "int64"';
        } else {
          outSwagger += indentator + '"format": "unsafe"';
        }
    } else {
        outSwagger += indentator + '"type": "number"';
    }
	if (document.getElementById("requestExamples").checked) { //Log example if checkbox is checked 
        outSwagger += "," + indentator + '"example": "' + num + '"';
    }

  };

  //date is ISO8601 format - https://xml2rfc.tools.ietf.org/public/rfc/html/rfc3339.html#anchor14
  function convertString (str) {
	/* 
    Append to 'outSwagger' string with Swagger schema attributes relative to given string
    Global variables updated: 
    -outSwagger
    */

    let regxDate = /^(19|20)\d{2}-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01])$/,
    regxDateTime = /^(19|20)\d{2}-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01]).([0-1][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9](\.[0-9]{1,2})?(Z|(\+|\-)([0-1][0-9]|2[0-3]):[0-5][0-9])$/;
    
	outSwagger += indentator + '"type": "string"';
	if (regxDateTime.test(str)) {
        outSwagger += ','
        outSwagger += indentator + '"format": "date-time"';
    } else if (regxDate.test(str)) {
        outSwagger += ','
        outSwagger += indentator + '"format": "date"';
    }
	if (document.getElementById("requestExamples").checked) { //Log example if checkbox is checked 
        outSwagger += "," + indentator + '"example": "' + str + '"';
    }
  };

  function convertArray (obj) {
	/* 
    Append to 'outSwagger' string with Swagger schema attributes relative to given array
    Global variables updated: 
    -outSwagger
    */

    outSwagger += indentator + '"type": "array",';
    // ---- Begin items scope ----
	outSwagger += indentator + '"items": {';
	conversorSelection(obj);
    outSwagger += indentator + '}';
	// ---- End items scope ----
  };

  function convertObject (obj) {
	/* 
    Append to 'outSwagger' string with Swagger schema attributes relative to given object
    Global variables updated: 
    -outSwagger
    */

    //Convert null attributes to given type
    if (obj === null) {
      outSwagger += indentator + '"type": "' + document.getElementById("nullType").value + '",';
      outSwagger += indentator + '"format": "nullable"';
	  return;
    }
    // ---- Begin properties scope ----
    outSwagger += indentator + '"type": "object",'
    outSwagger += indentator + '"properties": {';
    changeIndentation(tabCount + 1);
    //For each attribute inside that object
    for (var prop in obj) {
      // ---- Begin property type scope ----
      outSwagger += indentator + '"' + prop + '": {';
      conversorSelection(obj[prop]);
      outSwagger += indentator + '},' 
	  // ---- End property type scope ----
	}

    changeIndentation(tabCount - 1);
    if (Object.keys(obj).length > 0) { //At least 1 property inserted
      outSwagger = outSwagger.substring(0, outSwagger.length - 1); //Remove last comma
      outSwagger += indentator + '}'
    } else { // No property inserted
      outSwagger += ' }';
    }
  };

  function format(value, yaml) {
	/*
	Convert JSON to YAML if yaml checkbox is checked
	Global variables updated:
	NONE
	*/
    if (yaml) {
      return value.replace(/[{},"]+/g, '').replace(/\t/g, '  ').replace(/(^ *\n)/gm, '');
    } else {
      return value
    }
  } 
  
  // ---- Execution begins here ----
  inJSON = document.getElementById("JSON").value;
  try {
    inJSON = JSON.parse(inJSON);
  } catch (e) {
    alert("Your JSON is invalid!\n(" + e +")");
    return;
  }

  //For recursive functions to keep track of the tab spacing
  tabCount = 0; 
  indentator = "\n";
  // ---- Begin definitions ----
  outSwagger = '"definitions": {';
  changeIndentation(1);
  //For each object inside the JSON
  for (var obj in inJSON) {
    // ---- Begin schema scope ----
    outSwagger += indentator + '"' + obj + '": {'
	conversorSelection(inJSON[obj]);
    outSwagger += indentator + '},';
	// ---- End schema scope ----
  }
  //Remove last comma
  outSwagger = outSwagger.substring(0, outSwagger.length - 1);
  // ---- End definitions ----
  changeIndentation(tabCount-1);
  outSwagger += indentator + '}';


  document.getElementById("Swagger").value = format(outSwagger, document.getElementById("yamlOut").checked);
}