Initial commit

* Parser, compiler, objects, and VM base implementations
* Stuff will print out, functions called, etc
* There are probably plenty of bugs but this is a good starting point to
  start committing changes into git

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/syn/ast.rs

@@ -0,0 +1,72 @@
+use crate::syn::Spanned;
+
+#[derive(Debug, Clone)]
+pub enum Stmt {
+    Assign(AssignLhs, Expr),
+    Expr(SpExpr),
+    If {
+        if_true: SpCondExpr,
+        elseif: Vec<SpCondExpr>,
+        else_expr: Option<SpExpr>,
+    },
+    Def {
+        name: String,
+        params: Vec<SpParam>,
+        body: Vec<SpStmt>,
+    },
+    Import {
+        target: String,
+        from: Option<String>,
+    },
+}
+
+#[derive(Debug, Clone)]
+pub enum AssignLhs {
+    /// A simple assignment.
+    ///
+    /// `x = foo`
+    Name(String),
+
+    /// A more complex assignment.
+    ///
+    /// `x().bar = foo`
+    Complex(SpExpr, String),
+}
+
+pub type SpStmt = Spanned<Stmt>;
+
+#[derive(Debug, Clone)]
+pub struct CondExpr {
+    pub cond: SpExpr,
+    pub expr: SpExpr,
+}
+
+pub type SpCondExpr = Spanned<CondExpr>;
+
+#[derive(Debug, Clone)]
+pub struct Param {
+    pub name: String,
+    pub ty: Option<SpExpr>,
+}
+
+pub type SpParam = Spanned<Param>;
+
+#[derive(Debug, Clone)]
+pub enum Expr {
+    Call(Box<SpExpr>, Vec<SpExpr>),
+    Get(Box<SpExpr>, String),
+    Atom(SpAtom),
+}
+
+pub type SpExpr = Spanned<Expr>;
+
+#[derive(Debug, Clone)]
+pub enum Atom {
+    Int(i64),
+    Float(f64),
+    Str(String),
+    Sym(String),
+    Name(String),
+}
+
+pub type SpAtom = Spanned<Atom>;