nano/json.nano at e5202c9c85226119e137c5990f625ea0b92daf84

 print("=== JSON Encoder Demo ===");
 print("");
 class JSONEncoder {
     JSONEncoder(this) {
     }
     encode(this, value) {
         t = typeof(value);
         if (t == "null") {
             return "null";
         }
         if (t == "int" || t == "float") {
             return str(value);
         }
         if (t == "str") {
             return "\"" + value + "\"";
         }
         if (t == "array") {
             return this.encodeArray(value);
         }
         return "null";
     }
     encodeArray(this, arr) {
         result = "[";
         for (i = 0; i < len(arr); i++) {
             if (i > 0) {
                 result += ",";
             }
             result += this.encode(arr[i]);
         }
         result += "]";
         return result;
     }
 }
 encoder = new JSONEncoder();
 print("Encoding primitives:");
 print("  null ->", encoder.encode(null));
 print("  42 ->", encoder.encode(42));
 print("  3.14 ->", encoder.encode(3.14));
 print("  \"hello\" ->", encoder.encode("hello"));
 print("");
 print("Encoding arrays:");
 arr = {1, 2, 3};
 print("  {1, 2, 3} ->", encoder.encodeArray(arr));
 mixed = {1, "two", 3};
 print("  {1, \"two\", 3} ->", encoder.encodeArray(mixed));
 print("");
 print("=== JSON Decoder Demo ===");
 print("");
 class JSONDecoder {
     input = "";
     pos = 0;
     JSONDecoder(this) {
     }
     decode(this, jsonStr) {
         this.input = jsonStr;
         this.pos = 0;
         return this.parseValue();
     }
     parseValue(this) {
         this.skipWhitespace();
         if (this.pos >= this.input.length) {
             return null;
         }
         c = this.input.substr(this.pos, 1);
         if (c == "[") {
             return this.parseArray();
         }
         if (c == "n") {
             this.pos += 4;
             return null;
         }
         return this.parseNumber();
     }
     parseNumber(this) {
         start = this.pos;
         while (this.pos < this.input.length) {
             c = this.input.substr(this.pos, 1);
             isDigit = (c == "0" || c == "1" || c == "2" || c == "3" || c == "4" || c == "5" || c == "6" || c == "7" || c == "8" || c == "9" || c == "-");
             if (isDigit == 0) {
                 break;
             }
             this.pos++;
         }
         numStr = this.input.substr(start, this.pos - start);
         return int(numStr);
     }
     parseArray(this) {
         this.pos++;
         result = {};
         this.skipWhitespace();
         if (this.pos < this.input.length) {
             c = this.input.substr(this.pos, 1);
             if (c == "]") {
                 this.pos++;
                 return result;
             }
         }
         while (this.pos < this.input.length) {
             value = this.parseValue();
             result.push(value);
             this.skipWhitespace();
             if (this.pos >= this.input.length) {
                 break;
             }
             c = this.input.substr(this.pos, 1);
             if (c == "]") {
                 this.pos++;
                 break;
             }
             if (c == ",") {
                 this.pos++;
             }
         }
         return result;
     }
     skipWhitespace(this) {
         while (this.pos < this.input.length) {
             c = this.input.substr(this.pos, 1);
             if (c != " ") {
                 break;
             }
             this.pos++;
         }
     }
 }
 decoder = new JSONDecoder();
 print("Decoding numbers:");
 print("  \"123\" ->", decoder.decode("123"));
 print("  \"456\" ->", decoder.decode("456"));
 print("");
 print("Decoding arrays:");
 decoded = decoder.decode("[1,2,3]");
 print("  \"[1,2,3]\" -> length:", len(decoded));
 print("    element 0:", decoded[0]);
 print("    element 1:", decoded[1]);
 print("    element 2:", decoded[2]);
 print("");
 print("All JSON tests completed");