1 files changed, 150 insertions, 0 deletions
diff --git a/src/core/scope.c b/src/core/scope.c
new file mode 100644
index 0000000..f1ca006
--- /dev/null
+++ b/src/core/scope.c
@@ -0,0 +1,150 @@
+/*:*
+ *: File: ./src/core/scope.c
+ *: A simple interpreter
+ *:
+ *: WWW		: http://fype.buetow.org
+ *: E-Mail	: fype@dev.buetow.org
+ *:
+ *: Copyright (c) 2005 2006 2007 2008, Paul Buetow (http://www.pblabs.net)
+ *: All rights reserved.
+ *:
+ *: Redistribution and use in source and binary forms, with or without modi-
+ *: fication, are permitted provided that the following conditions are met:
+ *:  * Redistributions of source code must retain the above copyright
+ *:    notice, this list of conditions and the following disclaimer.
+ *:  * Redistributions in binary form must reproduce the above copyright
+ *:    notice, this list of conditions and the following disclaimer in the
+ *:    documentation and/or other materials provided with the distribution.
+ *:  * Neither the name of P. B. Labs nor the names of its contributors may
+ *:    be used to endorse or promote products derived from this software
+ *:    without specific prior written permission.
+ *:
+ *: THIS SOFTWARE IS PROVIDED BY Paul Buetow AS IS'' AND ANY EXPRESS OR
+ *: IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ *: WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ *: DISCLAIMED. IN NO EVENT SHALL Paul Buetow BE LIABLE FOR ANY DIRECT,
+ *: INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ *: (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ *:  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ *: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ *: STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ *: IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ *: POSSIBILITY OF SUCH DAMAGE.
+ *:*/
+
+#include "garbage.h"
+#include "scope.h"
+#include "symbol.h"
+
+Scope*
+scope_new(Hash *p_hash_syms) {
+   Scope *p_scope = malloc(sizeof(Scope));
+
+   p_scope->p_hash_global = p_hash_syms;
+   p_scope->p_stack_scopes = stack_new();
+
+   return (p_scope);
+}
+
+void
+scope_delete(Scope *p_scope) {
+   while (!stack_empty(p_scope->p_stack_scopes))
+      scope_down(p_scope);
+
+   stack_delete(p_scope->p_stack_scopes);
+
+   free(p_scope);
+}
+
+void
+scope_up(Scope *p_scope) {
+   stack_push(p_scope->p_stack_scopes, hash_new(1024));
+}
+
+void
+scope_down(Scope *p_scope) {
+   Hash *p_hash_syms = stack_pop(p_scope->p_stack_scopes);
+   hash_iterate(p_hash_syms, symbol_cleanup_hash_syms_cb);
+   hash_delete(p_hash_syms);
+}
+
+static Hash*
+_scope_get_hash(Scope *p_scope, char *c_key) {
+   StackIterator *p_iter = stackiterator_new(p_scope->p_stack_scopes);
+
+   while (stackiterator_has_next(p_iter)) {
+      Hash *p_hash_syms = stackiterator_next(p_iter);
+      Symbol *p_symbol = hash_get(p_hash_syms, c_key);
+
+      if (p_symbol != NULL) {
+         stackiterator_delete(p_iter);
+         return (p_hash_syms);
+      }
+   }
+
+   stackiterator_delete(p_iter);
+
+   if (hash_get(p_scope->p_hash_global, c_key))
+      return (p_scope->p_hash_global);
+
+   return (NULL);
+}
+
+Symbol*
+scope_get(Scope *p_scope, char *c_key) {
+   Hash *p_hash_syms = _scope_get_hash(p_scope, c_key);
+
+   if (p_hash_syms == NULL)
+      return (NULL);
+
+   return (hash_get(p_hash_syms, c_key));
+}
+
+Symbol*
+scope_remove(Scope *p_scope, char *c_key) {
+   Hash *p_hash_syms = _scope_get_hash(p_scope, c_key);
+
+   if (p_hash_syms == NULL)
+      return (NULL);
+
+   Symbol *p_symbol =  hash_remove(p_hash_syms, c_key);
+
+   return (p_symbol);
+}
+
+_Bool
+scope_exists(Scope *p_scope, char *c_key) {
+   return (scope_get(p_scope, c_key) != NULL);
+}
+
+_Bool
+scope_reset(Scope *p_scope, char *c_key, Symbol *p_symbol) {
+   Hash *p_hash_syms = _scope_get_hash(p_scope, c_key);
+
+   if (p_hash_syms == NULL)
+      return (false);
+
+   hash_remove(p_hash_syms, c_key);
+   hash_insert(p_hash_syms, c_key, p_symbol);
+
+   return (true);
+}
+
+_Bool
+scope_newset(Scope *p_scope, char *c_key, Symbol *p_symbol) {
+   Hash *p_hash_syms = NULL;
+
+   if (stack_empty(p_scope->p_stack_scopes)) {
+      if (hash_get(p_scope->p_hash_global, c_key) != NULL)
+         return (false);
+
+      p_hash_syms = p_scope->p_hash_global;
+
+   } else {
+      p_hash_syms = stack_top(p_scope->p_stack_scopes);
+   }
+
+   hash_insert(p_hash_syms, c_key, p_symbol);
+
+   return (true);
+}