Add labelled expressions.

Restructure project (again).

Convert `Cat` and `Alt` from binary to n+2-ary.

1 files changed, 0 insertions, 77 deletions

diff --git a/src/chomp/check/substitute.rs b/src/chomp/check/substitute.rs
deleted file mode 100644
index 32595b1..0000000
--- a/src/chomp/check/substitute.rs
+++ /dev/null
@@ -1,77 +0,0 @@
-use super::{
-    super::{
-        ast::{Alt, Call, Cat, Epsilon, Expression, Fix, Literal, Parameter, Variable},
-        error::SubstituteError,
-        visit::{Folder, Visitable},
-    },
-    DeepenVars, ShallowVars,
-};
-
-#[derive(Clone, Debug)]
-pub struct SubstituteParams {
-    params: Vec<Expression>,
-}
-
-impl SubstituteParams {
-    pub fn new(params: Vec<Expression>) -> Self {
-        Self { params }
-    }
-}
-
-impl Folder for SubstituteParams {
-    type Out = Result<Expression, SubstituteError>;
-
-    fn fold_epsilon(&mut self, eps: Epsilon) -> Self::Out {
-        Ok(eps.into())
-    }
-
-    fn fold_literal(&mut self, lit: Literal) -> Self::Out {
-        Ok(lit.into())
-    }
-
-    fn fold_cat(&mut self, mut cat: Cat) -> Self::Out {
-        cat.fst = Box::new(cat.fst.fold(self)?);
-        cat.snd = Box::new(cat.snd.fold(self)?);
-        Ok(cat.into())
-    }
-
-    fn fold_alt(&mut self, mut alt: Alt) -> Self::Out {
-        alt.left = Box::new(alt.left.fold(self)?);
-        alt.right = Box::new(alt.right.fold(self)?);
-        Ok(alt.into())
-    }
-
-    fn fold_fix(&mut self, mut fix: Fix) -> Self::Out {
-        for param in &mut self.params {
-            param.map(&mut DeepenVars::default());
-        }
-
-        fix.inner = Box::new(fix.inner.fold(self)?);
-
-        for param in &mut self.params {
-            param.map(&mut ShallowVars::default());
-        }
-
-        Ok(fix.into())
-    }
-
-    fn fold_variable(&mut self, var: Variable) -> Self::Out {
-        Ok(Expression::Variable(var))
-    }
-
-    fn fold_call(&mut self, mut call: Call) -> Self::Out {
-        call.args = call
-            .args
-            .into_iter()
-            .map(|arg| arg.fold(self))
-            .collect::<Result<_, _>>()?;
-        Ok(call.into())
-    }
-
-    fn fold_parameter(&mut self, param: Parameter) -> Self::Out {
-        self.params
-            .get(param.index())
-            .cloned()
-            .ok_or(SubstituteError::FreeParameter(param))
-    }
-}