Offchain scaffolding.

offchain/Cargo.toml

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+[package]
+name = "offchain"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+revm = "18.0.0" 

offchain/src/compiler/ast.rs

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+#[derive(Debug, Clone)]
+pub enum Expr {
+    IntLiteral(i32),
+    Instruction(InstructionKind, Vec<Expr>),
+    // You might have a variant for sublists if needed,
+    // or keep it all in the same structure.
+}
+
+#[derive(Debug, Clone)]
+pub enum InstructionKind {
+    // e.g. Plus, Minus, Mult, etc.
+    Plus,
+    Minus,
+    Mult,
+}

offchain/src/compiler/bytecode_generator.rs

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+use super::ast::{Expr, InstructionKind};
+
+pub fn ast_to_bytecode(expr: &Expr) -> Vec<u8> {
+    // for now, just a stub
+    // eventually we produce push3 tokens
+    vec![]
+}

offchain/src/compiler/bytecode_parser.rs

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+use super::ast::{Expr};
+
+pub fn bytecode_to_ast(data: &[u8]) -> Expr {
+    // parse tokens, produce expr
+    // stub for now
+    Expr::IntLiteral(0)
+}

offchain/src/compiler/mod.rs

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+pub mod ast;
+pub mod bytecode_generator;
+pub mod bytecode_parser;
+
+// In the future, we'll define or `pub use` them.

offchain/src/evm_integration/mod.rs

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+pub mod revm_runner;

offchain/src/evm_integration/revm_runner.rs

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+pub fn run_in_revm(bytecode: &[u8]) -> Result<Vec<i64>, String> {
+    // set up revm, load the code, call push3
+    // for now just stub
+    Ok(vec![])
+}

offchain/src/gp/genetic_ops.rs

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+use crate::compiler::ast::{Expr};
+
+pub fn crossover(a: &Expr, b: &Expr) -> (Expr, Expr) {
+    // stub
+    (a.clone(), b.clone())
+}
+
+pub fn mutate(expr: &mut Expr) {
+    // stub
+}

offchain/src/gp/mod.rs

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+pub mod population;
+pub mod genetic_ops;
+// pub mod fitness;
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_dummy() {
+        assert_eq!(2+2, 4);
+    }
+}

offchain/src/gp/population.rs

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+#[derive(Debug, Clone)]
+pub struct Individual {
+    pub fitness: f64,
+    // your Expr or bytecode or both
+}
+
+pub struct Population {
+    pub individuals: Vec<Individual>,
+}

offchain/src/main.rs

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+mod compiler;
+mod gp;
+mod evm_integration;
+
+fn main() {
+    println!("Welcome to My GP System CLI");
+    // e.g., parse arguments, run a small demonstration?
+    // For now just a stub.
+}