From c497aca556295479b1ed5632e125ff1d0658d8d8 Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Mon, 11 Oct 2021 09:40:39 +0200
Subject: Add a base struct to start environment refactoring

---
 src/bootstrap/environment.c | 21 ++++++++++++++++++++-
 src/bootstrap/main.c        |  3 +++
 src/bootstrap/primitives.c  |  5 +++--
 3 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/src/bootstrap/environment.c b/src/bootstrap/environment.c
index 4eda2ad..fca2449 100644
--- a/src/bootstrap/environment.c
+++ b/src/bootstrap/environment.c
@@ -7,17 +7,36 @@ typedef struct EnvSymbol {
     Object *value;
 } EnvSymbol;
 
+typedef struct Environment {
+    struct Environment *parent;
+    EnvSymbol *memory;
+    size_t size;
+    size_t capacity;
+} Environment;
+
 #define ENV_SIZE 256
 static EnvSymbol environment[ENV_SIZE];
 static size_t env_n = 0;
 
 Object *
-find_environment_symbol(Object *symbol) {
+env_find_symbol(Object *symbol) {
     for (size_t i = 0; i < env_n; i++) {
         if (symbol_eq(environment[i].symbol, symbol)) {
             return environment[i].value;
         }
     }
+    return obj_nil;
+}
+
+Environment *
+env_create(Environment *parent) {
+    // TODO: calloc env and assign parent.
     return NULL;
 }
 
+void
+env_add_symbol(EnvSymbol symbol, Environment *env) {
+    // TODO: If empty allocate enough for one object.
+    // TODO: If full double the capacity and realloc.
+    // TODO: Put the symbol on the next slot available.
+}
diff --git a/src/bootstrap/main.c b/src/bootstrap/main.c
index 65e508f..66c3780 100755
--- a/src/bootstrap/main.c
+++ b/src/bootstrap/main.c
@@ -54,6 +54,9 @@ init(void) {
     environment[env_n++] = (EnvSymbol){MAKE_SYM("or"), make_procedure(proc_or)};
     environment[env_n++] = (EnvSymbol){MAKE_SYM("if"), make_procedure(proc_if)};
     environment[env_n++] = (EnvSymbol){MAKE_SYM("else"), obj_true};
+    environment[env_n++] = (EnvSymbol){MAKE_SYM("true"), obj_true};
+    environment[env_n++] = (EnvSymbol){MAKE_SYM("false"), obj_false};
+    environment[env_n++] = (EnvSymbol){MAKE_SYM("nil"), obj_nil};
     environment[env_n++] = (EnvSymbol){MAKE_SYM("cond"), make_procedure(proc_cond)};
     environment[env_n++] = (EnvSymbol){MAKE_SYM("car"), make_procedure(proc_car)};
     environment[env_n++] = (EnvSymbol){MAKE_SYM("cdr"), make_procedure(proc_cdr)};
diff --git a/src/bootstrap/primitives.c b/src/bootstrap/primitives.c
index 806656e..3c03b99 100644
--- a/src/bootstrap/primitives.c
+++ b/src/bootstrap/primitives.c
@@ -62,7 +62,7 @@ eval(Object *root) {
             return root;
         } break;
         case OBJ_TYPE_SYMBOL: {
-            Object *value = find_environment_symbol(root);
+            Object *value = env_find_symbol(root);
             if (value == NULL) {
                 printf("error: symbol not found: `");
                 display(root);
@@ -73,7 +73,7 @@ eval(Object *root) {
         } break;
         case OBJ_TYPE_PAIR: {
             if (root->car->type == OBJ_TYPE_SYMBOL) {
-                Object *value = find_environment_symbol(root->car);
+                Object *value = env_find_symbol(root->car);
                 if (value == NULL) {
                     printf("error: symbol not found: `");
                     display(root->car);
@@ -699,6 +699,7 @@ proc_equal(Object *args) {
 
 // TODO: fixnum left/right shift, mask, invert
 // TODO: implement and test missing procedures
+// TODO: add primitives for type transforms: string->symbol, symbol->string, etc
 // TODO: properly implement nested environments
 // TODO: implement support for quotes and semi-quotes
 // TODO: LAMBDA
-- 
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