A simple JSON stringify for Wren language.

JSON.stringify.wren.js

// the .js is only for syntax highlighter.

class JSON {
  // Based on https://github.com/brandly/wren-json/blob/master/json.wren
  static stringify(obj) {
    if (obj is Num || obj is Bool || obj is Null) {
      return obj.toString
    }
    
    if (obj is String) {
      // Escape special characters
      var specialchars = {
        "\"" : "\\\"",
        "\\" : "\\\\",
        "\b" : "\\b",
        "\f" : "\\f",
        "\n" : "\\n",
        "\r" : "\\r",
        "\t" : "\\t",
        "\v" : "\\v"
      }
      var substrings = []
      for (char in obj) {
        if(specialchars[char]) {
          substrings.add(specialchars[char])
        } else {
          substrings.add(char)
        }
      }
      return "\"" + substrings.join("") + "\""
    }
    
    if (obj is List) {
      var substrings = obj.map { |item| JSON.stringify(item) }
      return "[" + substrings.join(",") + "]"
    }
    
    if (obj is Map) {
      var substrings = obj.keys.map { |key|
        return JSON.stringify(key) + ":" + JSON.stringify(obj[key])
      }
      return "{" + substrings.join(",") + "}"
    }
  }
}