From b3f27f132f8ac405f8cdf7e201f03d157f366125 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Sun, 10 Jul 2022 20:24:01 +0200
Subject: work

---
 module/c/cpp-environment.scm | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

(limited to 'module/c/cpp-environment.scm')

diff --git a/module/c/cpp-environment.scm b/module/c/cpp-environment.scm
index 51f16168..fa69e1fc 100644
--- a/module/c/cpp-environment.scm
+++ b/module/c/cpp-environment.scm
@@ -15,6 +15,7 @@
            macro-identifier-list
            macro-variadic?
            macro?
+           ;; pprint-macro
 
            enter-active-if
            enter-inactive-if
@@ -31,13 +32,14 @@
            internal-macro?
 
            cpp-environment
+           cpp-environment?
            cpp-if-status cpp-variables
 
            make-environment in-environment?
            remove-identifier! add-identifier!
            get-identifier
            extend-environment
-
+           disjoin-macro
            ))
 
 (define (macro-identifier x)
@@ -73,6 +75,9 @@
       (fun:function-like-macro? x)
       (int:internal-macro? x)))
 
+
+
+
 (define-type (cpp-environment)
   (cpp-if-status type: (list-of (memv '(outside active-if inactive-if)))
                  default: '(outside))
@@ -81,6 +86,7 @@
                              (list-of (pair-of string? exact-integer?)))
                   default: '(("*outside*" . 1))))
 
+
 
 
 (define (enter-active-if environment)
@@ -112,7 +118,13 @@
 
 (define (make-environment) (cpp-environment))
 
-(define (in-envirnoment? environment key)
+(define (clone-hash-table ht)
+  (alist->hash-table (hash-map->list cons ht)))
+
+(define (clone-environment environment)
+  (modify environment cpp-variables clone-hash-table))
+
+(define (in-environment? environment key)
   (hash-get-handle (cpp-variables environment) key))
 
 (define (remove-identifier! environment key)
@@ -134,11 +146,15 @@
 (define (get-identifier environment key)
   (hash-ref (cpp-variables environment) key))
 
-(define (clone-hash-table ht)
-  (alist->hash-table (hash-map->list cons ht)))
 
 (define (extend-environment environment macros)
-  (let ((env (modify environment cpp-variables clone-hash-table)))
+  (typecheck macros (list-of macro?))
+  (let ((env (clone-environment environment)))
     (fold (lambda (m env) (add-identifier! env (macro-identifier m) m))
           env macros)))
 
+(define (disjoin-macro environment name)
+  (typecheck name string?)
+  (let ((env (clone-environment environment)))
+    (remove-identifier! env name)
+    env))
-- 
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