From 67751a2f472c03c1dd632d39b53f9c6c5967dcb1 Mon Sep 17 00:00:00 2001
From: Gabriel Pariat <gabriel@pariatech.com>
Date: Mon, 21 Feb 2022 06:20:42 -0500
Subject: [PATCH] handling reader macro

---
 implementations/c/src/lisp.c   | 13 ++++++++++++-
 implementations/c/src/lisp.h   |  1 -
 implementations/c/src/reader.c | 14 +++-----------
 3 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/implementations/c/src/lisp.c b/implementations/c/src/lisp.c
index a11a3dc..89ab7fb 100644
--- a/implementations/c/src/lisp.c
+++ b/implementations/c/src/lisp.c
@@ -303,12 +303,14 @@ void init(void) {
   SET_FUNC("peek-char", peek_char_fn);
   SET_FUNC("read-char", read_char_fn);
   SET_FUNC("read", read_fn);
+  SET_FUNC("set-reader-macro", set_reader_macro_fn);
   SET_FUNC("exit", exit_fn);
   SET_FUNC("=", eq_fn);
   SET_FUNC("<", lt_fn);
   SET_FUNC(">", gt_fn);
   SET_FUNC("<=", le_fn);
   SET_FUNC(">=", ge_fn);
+  SET_FUNC("print", print_fn);
 
   SET_FORM("if", if_fn);
   SET_FORM("let", let_fn);
@@ -321,10 +323,19 @@ void init(void) {
   SET_FORM("defmacro", defmacro_fn);
 }
 
+/*
+(set-reader-macro \' (fn (s c) (list quote (read s))))
+ */
+
 void repl(void) {
   while(true) {
     printf(">>> ");
-    print(eval(read_fn(NIL, NIL), NIL), stdout);
+    Pointer readed = read_fn(NIL, NIL);
+    char c;
+    while((c = getc(stdin)) && isspace(c) && c != '\n');
+    if (c != '\n') ungetc(c, stdin);
+    print(eval(readed, NIL), stdout);
+
     printf("\n");
   }
 }
diff --git a/implementations/c/src/lisp.h b/implementations/c/src/lisp.h
index 3095e2b..5ea34fe 100644
--- a/implementations/c/src/lisp.h
+++ b/implementations/c/src/lisp.h
@@ -144,7 +144,6 @@ Pointer string_clear(Pointer str);
 Pointer environment_get(Pointer env, Pointer key);
 Pointer environment_set(Pointer env, Pointer key, Pointer value);
 
-Pointer set_reader_macro(Pointer c, Pointer fn);
 Char get_utf8(FILE* s);
 Char unget_utf8(Char c, FILE* s);
 Char peek_char(Pointer type, Stream stream);
diff --git a/implementations/c/src/reader.c b/implementations/c/src/reader.c
index b7c1f30..f816a64 100644
--- a/implementations/c/src/reader.c
+++ b/implementations/c/src/reader.c
@@ -114,7 +114,7 @@ Pointer read1(Pointer streamPtr, Pointer env) {
     case NATIVE_FUNC:
       return NATIVE_FUNC(macro)(LIST(streamPtr, character(get_utf8(stream))), env);
     case FUNC:
-      return eval_fn(LIST(macro, streamPtr, character(get_utf8(stream))), env);
+      return eval(LIST(macro, streamPtr, character(get_utf8(stream))), env);
     default: break;
     }
   }
@@ -139,22 +139,14 @@ Pointer read1(Pointer streamPtr, Pointer env) {
 Pointer read_fn(Pointer args, Pointer env) {
   Pointer streamPtr = CAR(args);
   streamPtr = streamPtr == NIL ? environment_get(env, STANDARD_INPUT) : streamPtr;
-  Stream stream = STREAM(streamPtr);
   Pointer result = read1(streamPtr, env);
-  char c;
-  while((c = getc(stream)) && isspace(c) && c != '\n');
-  if (c != '\n') ungetc(c, stream);
   return result;
 }
 
-Pointer set_reader_macro(Pointer c, Pointer fn) {
-  READTABLE = table_set(READTABLE, c, fn);
-  return T;
-}
-
 Pointer set_reader_macro_fn(Pointer args, Pointer env) {
   (void) env;
-  return set_reader_macro(CAR(args), CAR(CDR (args)));
+  READTABLE = table_set(READTABLE, CHAR(CAR(args)), CAR(CDR(args)));
+  return T;
 }
 
 static bool return_char(Stream stream) {