Json in Verilog

// Verilog doesn't have built-in JSON support, so we'll simulate JSON-like
// functionality using structs and string manipulation.

module json_example;

  // Define structs to represent JSON-like data
  typedef struct {
    int Page;
    string Fruits[];
  } Response1;

  typedef struct {
    int page;
    string fruits[];
  } Response2;

  // Function to simulate JSON encoding
  function string encode(input string data);
    // In real Verilog, you'd implement string manipulation here
    return {"{", data, "}"};
  endfunction

  // Function to simulate JSON decoding
  function void decode(input string json_string, output string data);
    // In real Verilog, you'd implement string parsing here
    data = json_string.substr(1, json_string.len() - 2);
  endfunction

  initial begin
    // Simulating JSON encoding of basic data types
    $display(encode("true"));
    $display(encode("1"));
    $display(encode("2.34"));
    $display(encode("\"gopher\""));

    // Simulating JSON encoding of arrays and structs
    string fruits[] = '{"apple", "peach", "pear"};
    $display(encode($sformatf("%p", fruits)));

    // Simulating custom type encoding
    Response1 res1;
    res1.Page = 1;
    res1.Fruits = fruits;
    $display(encode($sformatf("Page:%0d,Fruits:%p", res1.Page, res1.Fruits)));

    // Simulating JSON decoding
    string json_string = "{\"page\": 1, \"fruits\": [\"apple\", \"peach\"]}";
    string decoded_data;
    decode(json_string, decoded_data);
    $display("Decoded: %s", decoded_data);

    // In Verilog, we don't have dynamic typing, so we'd need to know the
    // structure of the data beforehand to properly decode it.
    Response2 res2;
    // Here we'd parse the decoded_data string to fill res2
    // This would require custom string parsing logic
    $display("Page: %0d", res2.page);
    $display("First fruit: %s", res2.fruits[0]);
  end

endmodule

This Verilog code simulates JSON-like functionality, as Verilog doesn’t have built-in JSON support. Here’s a breakdown of the key points:

We define struct-like types (Response1 and Response2) to represent JSON objects.
We create simple encode and decode functions to simulate JSON encoding and decoding. In a real implementation, these would involve more complex string manipulation.
The initial block demonstrates how to use these functions with various data types.
We show how to work with array-like structures and custom types.
For decoding, we simulate parsing a JSON string into a struct. In practice, this would require implementing a custom parser.
Verilog doesn’t have dynamic typing or reflection, so working with JSON-like data structures is more challenging and requires more manual work compared to Go.
Error handling is not implemented in this example, but in a real-world scenario, you’d need to add robust error checking for parsing and data manipulation.

Remember, this is a simplified simulation of JSON-like functionality in Verilog. In practice, working with complex data structures in Verilog typically involves using more low-level bit manipulation or generating Verilog code from higher-level descriptions.

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