start bird

README.md

@@ -1,3 +1,5 @@
+There is currently a tree-walking interpreter called `bird` in progress, but the plan is to have a bytecode vm in the end
+
 language_name is a small embeddable scripting language
 
 language_name is inspired by Javascript, Lox, Lua, Python, Rust and more

src/bird/mem.rs

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+use std::collections::HashMap;
+use std::rc::Rc;
+
+#[derive(Debug, PartialEq, Clone, Hash)]
+enum Value {
+    Null,
+    Bool(bool),
+    Number(f64),
+    String(String),
+    Object(HashMap<String, Value>),
+    Array(Vec<Value>),
+}

src/bird/mod.rs

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+mod mem;
+
+use crate::ast::Program;
+
+#[derive(Debug)]
+struct Vm {}
+
+fn execute(program: Program) {}

src/lib.rs

@@ -1,4 +1,5 @@
 mod ast;
+mod bird;
 mod errors;
 mod lex;
 mod parse;

std.md

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+# Std functions
+
+`x`, `y`, .. : arguments  
+`x?` : optional  
+`x(): int` : return type
+
+Available on the global scope for now:
+
+# IO
+
+`print(x)`
+
+`println(x)`
+
+`input(x?): string`
+
+`time(): number`
+