Epic JDSL

"The Epic JDSL" is a Turing-complete programming language where the source code is valid JSON.

The Lore

You like JSON? You like Domain Specific Languages? You like Tom? Here is the ultimate convergence: JDSL.

Specification

Types

• Variables: Immutable by default (?), but we support reassignment.
• Data Types: String, Number, Boolean, Null, Array, Object (standard JSON).

Syntax

A program is a JSON Array of Instructions.

[
  {"instruction_1": "args"},
  {"instruction_2": "args"}
]

Core Instructions

Variables

• let: Define a new variable.

  {"let": "myVar", "value": 123}

• set: Update an existing variable.

  {"set": "myVar", "value": 456}

Operations (op)

Perform an operation and return a value. Can be nested. Arguments can be literals or variable references {"var": "name"}.

Supported ops: add, sub, mul, div, eq, lt, gt, concat.

{"op": "add", "args": [{"var": "x"}, 10]}

Control Flow

• if: Conditional execution.

  {
    "if": {"op": "eq", "args": [{"var": "x"}, 0]},
    "then": [...],
    "else": [...]
  }

• while: Loops.

  {
    "while": {"op": "lt", "args": [{"var": "x"}, 10]},
    "do": [...]
  }

I/O

• print: Print to stdout.

  {"print": "Hello World"}

Usage

Run the interpreter with a .jdsl file:

zig build run -- program.jdsl