Add a lot of new stuff to the compile mod

* compile::sym is now compile::name
* add basic block structure
* add visitor pattern
* some other minor things (e.g. syn::ast::prelude)

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

src/compile/mod.rs

@@ -1,30 +1,41 @@
-pub mod sym;
+pub mod block;
+pub mod error;
+pub mod ir;
+pub mod name;
+pub mod visit;
 
 use crate::{
     syn::ast::Stmt,
-    compile::sym::SymStack,
+    compile::name::NameStack,
 };
 
-pub trait Pass {
-    type Out;
-    fn pass(&self, ctx: &mut Ctx) -> Self::Out;
-}
-
 // * Desugar
 // * Collect names as symbols
 // * Create basic blocks
 
-pub struct Ctx {
-    sym_stack: SymStack,
+pub struct Ctx<'t> {
+    text: &'t str,
+    name_stack: NameStack,
 }
 
-impl Ctx {
-    pub fn sym_stack(&self) -> &SymStack {
-        &self.sym_stack
+impl<'t> Ctx<'t> {
+    pub fn new(text: &'t str) -> Self {
+        Ctx {
+            text,
+            name_stack: NameStack::new(),
+        }
     }
 
-    pub fn sym_stack_mut(&mut self) -> &mut SymStack {
-        &mut self.sym_stack
+    pub fn text(&self) -> &'t str {
+        self.text
+    }
+
+    pub fn name_stack(&self) -> &NameStack {
+        &self.name_stack
+    }
+
+    pub fn name_stack_mut(&mut self) -> &mut NameStack {
+        &mut self.name_stack
     }
 }