From aac3549a72663c523a456b2f5d7c3b77f509cdd6 Mon Sep 17 00:00:00 2001
From: Greg Brown <gmb60@cam.ac.uk>
Date: Thu, 14 Jan 2021 11:42:55 +0000
Subject: Add labelled expressions.

Restructure project (again).

Convert `Cat` and `Alt` from binary to n+2-ary.
---
 src/chomp/context.rs | 51 ---------------------------------------------------
 1 file changed, 51 deletions(-)
 delete mode 100644 src/chomp/context.rs

(limited to 'src/chomp/context.rs')

diff --git a/src/chomp/context.rs b/src/chomp/context.rs
deleted file mode 100644
index 392023f..0000000
--- a/src/chomp/context.rs
+++ /dev/null
@@ -1,51 +0,0 @@
-use super::{ast::Variable, error::VariableError, typed::Type};
-
-#[derive(Debug, Default)]
-pub struct Context {
-    vars: Vec<Type>,
-    unguard_points: Vec<usize>,
-}
-
-impl Context {
-    pub fn new() -> Self {
-        Self::default()
-    }
-
-    pub fn depth(&self) -> usize {
-        self.vars.len()
-    }
-
-    pub fn is_unguarded(&self, var: &Variable) -> Option<bool> {
-        if self.vars.len() <= var.index() {
-            None
-        } else if self.unguard_points.is_empty() {
-            Some(false)
-        } else {
-            Some(
-                self.unguard_points[self.unguard_points.len() - 1] + var.index() >= self.vars.len(),
-            )
-        }
-    }
-
-    pub fn with_unguard<F: FnOnce(&mut Self) -> R, R>(&mut self, f: F) -> R {
-        self.unguard_points.push(self.vars.len());
-        let res = f(self);
-        self.unguard_points.pop();
-        res
-    }
-
-    pub fn get_variable_type(&self, var: &Variable) -> Result<&Type, VariableError> {
-        match self.is_unguarded(var) {
-            None => Err(VariableError::FreeVariable(var.clone())),
-            Some(false) => Err(VariableError::GuardedVariable(var.clone())),
-            Some(true) => Ok(&self.vars[self.vars.len() - var.index() - 1]),
-        }
-    }
-
-    pub fn with_variable_type<F: FnOnce(&mut Self) -> R, R>(&mut self, ty: Type, f: F) -> R {
-        self.vars.push(ty);
-        let res = f(self);
-        self.vars.pop();
-        res
-    }
-}
-- 
cgit v1.2.3