Jsonpiler — JSON Syntax Programming Language

Jsonpiler is a compiler and runtime for a programming language that uses JSON or JSPL (Jsonpiler Structured Programming Language) as its syntax. It converts a JSON-based program into x86_64 Windows PE machine code, links it, and executes the result. Jsonpiler bundles an assembler and linker purpose-built for its IR and PE output on Windows.

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🚨 Windows only (x64) — Jsonpiler targets 64-bit Windows and produces native PE executables.

What’s New

0.6.4

• Fixed a problem in which the fifth and later arguments of user-defined functions were not recognized correctly.
• Four arithmetic operations +, -, *, / now support Float type
• Added function to truncate Float to integer: Int.
• Added I/O function: print.
• Fixed an error in global function.

See CHANGELOG for full history and plans.

Requirements

No external toolchains or libraries are required.

The following system DLLs must be available in C:\\Windows\\System32\\:

• kernel32.dll
• user32.dll

These are present on standard Windows installations.

Install & Run

cargo install jsonpiler

# Compile and execute a JSON program
jsonpiler <input.json> [args passed to the produced .exe]

• <input.json> must be UTF-8 encoded.
• Any additional arguments are forwarded to the generated executable at runtime.

Language & Function References

• Language Spec (Markdown): https://github.com/HAL-G1THuB/jsonpiler/blob/main/docs/specification.md
• Function Reference (Markdown): https://github.com/HAL-G1THuB/jsonpiler/blob/main/docs/functions.md

JSPL

With the introduction of JSPL (Jsonpiler Structured Programming Language), Jsonpiler significantly improves human readability and writability, which were challenging under the strict JSON-based syntax. JSPL is designed to express function definitions,conditionals, function calls, and variable assignments in a natural and intuitive form. All JSPL code is internally transformed into the same JSON-based intermediate representation (IR), ensuring full compatibility with the existing Jsonpiler compilation infrastructure while making programs easier to write and understand. For more details, see the language specification above.

Examples

Browse ready-to-run samples in examples/: https://github.com/HAL-G1THuB/jsonpiler/blob/main/examples

Minimal example:

{ "=": ["a", "title"], "message": [{"$": "a"}, "345"], "+": [1, 2, 3] }

Execution order

• A Jsonpiler program is a single JSON object whose keys are evaluated sequentially.
• "=" assigns the string "title" to the variable a.
• "message" prints the value of a followed by "345".
• "+" computes the sum of 1, 2, and 3, i.e., 6.

The program’s final expression value becomes the process exit code. Running under cargo run may look like this (Windows reports process exit code 6):

error: process didn't exit successfully: `jsonpiler.exe test.json` (exit code: 6)

This is expected behavior and not an error in Jsonpiler itself.

Diagnostics (Errors & Warnings)

Input:

{ "message": ["title", { "$": "doesn't_exist" }] }

Output:

Compilation error: Undefined variables: `doesn't_exist`
Error occurred on line: 1
Error position:
{ "message": ["title", { "$": "doesn't_exist" }] }
                              ^^^^^^^^^^^^^^^

Pipeline Overview

graph TD
  subgraph Read
    A["file.json
{ "+": [1, 2] }"] --> B{Jsonpiler}
  end
  subgraph Parse
    B --o C["AST
Json::Object([
  Json::String("+"),
  Json::Array([
    Json::Int(1),
    Json::Int(2)
])])"]
    B --x PError[[ParseError]]
  end
  subgraph Compile
    C --x CError[[CompileError]]
    C --o E["Assembler IR
[
  ...Inst::MovQQ(Rax, 1),
  Inst::MovQQ(Rcx, 2),
  Inst::AddRR(Rax, Rcx)...
]"]
  end
  subgraph Evaluate
    C --o D["Json::Int(Temporary Value)"]
    C --x EError[[TypeError or ArityError]]
    D -->|Detect Exit Code| E
  end
  subgraph Assemble
    E --o G["Binary machine code
  [...0x48, 0x89, 0o201]..."]
    E --x AError[[InternalError]]
  end
  subgraph Link
    G --o F["Portable Executable (PE)"]
    G --x LError[[InternalError]]
  end
  subgraph Write
    F --> H[file.exe]
  end
  subgraph Execution
    H --> Exec[(Execute)]
  end
  subgraph DLL
    S[C:\\Windows\\System32\\]
    KERNEL32[kernel32.dll]
    USER32[user32.dll]
    S --> KERNEL32 --> F
    S --> USER32 --> F
  end

Notes

• Output is a native PE executable for Windows x64.
• SEH is currently disabled and may be re-enabled in a future release.
• If you see a non-zero exit code under Cargo, it likely reflects your program’s final value.

License

This project’s license is specified in the repository.

Contributing

Issues and PRs are welcome! If you find a bug, please include the following information:

🚨 Please make sure you are running on Windows x64.

• The JSON program (minimal reproduction if possible)
• Jsonpiler version