16 files changed, 3524 insertions, 0 deletions
diff --git a/src/core/convert.c b/src/core/convert.c
new file mode 100644
index 0000000..0d63619
--- /dev/null
+++ b/src/core/convert.c
@@ -0,0 +1,185 @@
+/*:*
+ *: File: ./src/core/convert.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 "convert.h"
+
+void
+convert_to_integer(Token *p_token) {
+   switch (token_get_tt(p_token)) {
+   case TT_INTEGER:
+      break;
+   case TT_DOUBLE:
+      token_set_tt(p_token, TT_INTEGER);
+      token_set_ival(p_token, (int)token_get_dval(p_token));
+      break;
+   case TT_STRING:
+      token_set_tt(p_token, TT_INTEGER);
+      token_set_ival(p_token, atoi(token_get_val(p_token)));
+      break;
+   default:
+      ERROR("Ouups(%s)", tt_get_name(token_get_tt(p_token)));
+      break;
+   }
+}
+
+int
+convert_to_integer_get(Token *p_token) {
+   switch (token_get_tt(p_token)) {
+   case TT_INTEGER:
+      return (token_get_ival(p_token));
+   case TT_DOUBLE:
+      return ((int) token_get_dval(p_token));
+   case TT_STRING:
+      return (atoi(token_get_val(p_token)));
+   default:
+      ERROR("Ouups(%s)", tt_get_name(token_get_tt(p_token)));
+   }
+
+   return (0); /* Never reach this point */
+}
+
+void
+convert_to_double(Token *p_token) {
+   switch (token_get_tt(p_token)) {
+   case TT_INTEGER:
+      token_set_tt(p_token, TT_DOUBLE);
+      token_set_dval(p_token, token_get_ival(p_token));
+      break;
+   case TT_DOUBLE:
+      break;
+   case TT_STRING:
+      token_set_tt(p_token, TT_DOUBLE);
+      token_set_dval(p_token, atof(token_get_val(p_token)));
+      break;
+   default:
+      token_print_val(p_token);
+      ERROR("Datatype conversion error '%s'", token_get_val(p_token));
+      break;
+   }
+}
+
+void
+convert_to_string(Token *p_token) {
+   switch (token_get_tt(p_token)) {
+   case TT_INTEGER:
+   {
+      token_set_tt(p_token, TT_STRING);
+      char c_tmp[1024];
+      sprintf(c_tmp, "%d", token_get_ival(p_token));
+      int i_len = strlen(c_tmp);
+      p_token->c_val = realloc(p_token->c_val, sizeof(char) * (i_len + 1));
+      strcpy(p_token->c_val, c_tmp);
+      p_token->c_val[i_len] = 0;
+   }
+   break;
+   case TT_DOUBLE:
+   {
+      token_set_tt(p_token, TT_STRING);
+      char c_tmp[1024];
+      sprintf(c_tmp, "%f", token_get_dval(p_token));
+      int i_len = strlen(c_tmp);
+      p_token->c_val = realloc(p_token->c_val, sizeof(char) * (i_len + 1));
+      strcpy(p_token->c_val, c_tmp);
+      p_token->c_val[i_len] = 0;
+   }
+   break;
+   case TT_STRING:
+      break;
+   default:
+      ERROR("Datatype conversion error");
+      break;
+   }
+}
+
+void
+convert_to_tt(Token *p_token, TokenType tt) {
+   switch (tt) {
+   case TT_INTEGER:
+      convert_to_integer(p_token);
+      break;
+   case TT_DOUBLE:
+      convert_to_double(p_token);
+      break;
+   case TT_STRING:
+      convert_to_string(p_token);
+      break;
+   default:
+      ERROR("Ouups!");
+   }
+}
+
+TokenType
+convert_to_highest(Token *p_token1, Token *p_token2) {
+   TokenType tt_highest = token_get_tt(p_token1);
+
+   if (tt_highest < token_get_tt(p_token2)) {
+      tt_highest = token_get_tt(p_token2);
+
+      convert_to_tt(p_token1, tt_highest);
+
+   } else {
+      convert_to_tt(p_token2, tt_highest);
+   }
+
+   return (tt_highest);
+}
+
+TokenType
+convert_function_arg_types_to_highest(Stack *p_stack_args, int i_args) {
+
+   if (i_args <= 0)
+      i_args = stack_size(p_stack_args);
+
+   StackIterator *p_iter = stackiterator_new(p_stack_args);
+   TokenType tt_highest = TT_INTEGER;
+
+   for (int i = 0; i < i_args && stackiterator_has_next(p_iter); ++i) {
+      Token *p_token = stackiterator_next(p_iter);
+      if (token_get_tt(p_token) > tt_highest)
+         tt_highest = token_get_tt(p_token);
+   }
+
+   stackiterator_delete(p_iter);
+   p_iter = stackiterator_new(p_stack_args);
+
+   for (int i = 0; i < i_args && stackiterator_has_next(p_iter); ++i) {
+      Token *p_token = stackiterator_next(p_iter);
+      convert_to_tt(p_token, tt_highest);
+   }
+
+   stackiterator_delete(p_iter);
+
+   return (tt_highest);
+}
+
diff --git a/src/core/convert.h b/src/core/convert.h
new file mode 100644
index 0000000..c4e0b1d
--- /dev/null
+++ b/src/core/convert.h
@@ -0,0 +1,53 @@
+/*:*
+ *: File: ./src/core/convert.h
+ *: 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.
+ *:*/
+
+#ifndef CONVERT_H
+#define CONVERT_H
+
+#include "../defines.h"
+
+#include "../data/stack.h"
+
+#include "token.h"
+
+int convert_to_integer_get(Token *p_token);
+void convert_to_integer(Token *p_token);
+void convert_to_double(Token *p_token);
+void convert_to_string(Token *p_token);
+void convert_to_tt(Token *p_token, TokenType tt);
+TokenType convert_to_highest(Token *p_token1, Token *p_token2);
+TokenType convert_function_arg_types_to_highest(Stack *p_stack_args, int
+      i_args);
+
+#endif
diff --git a/src/core/function.c b/src/core/function.c
new file mode 100644
index 0000000..fd18ba0
--- /dev/null
+++ b/src/core/function.c
@@ -0,0 +1,661 @@
+/*:*
+ *: File: ./src/core/function.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 <stdlib.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "function.h"
+
+#include "convert.h"
+#include "scope.h"
+#include "symbol.h"
+
+#define _FUNCTION_ERROR(m,t) \
+	 ERROR(\
+		"%s: Function error in %s line %d pos %d near '%s'", m, \
+		token_get_filename(t), \
+		token_get_line_nr(t), \
+		token_get_pos_nr(t), \
+		token_get_val(t) \
+		)
+
+void
+_process(Interpret *p_interpret, Token *p_token_store, Token *p_token_op,
+         Token *p_token_next) {
+
+   TokenType tt_op = token_get_tt(p_token_op);
+
+#ifdef DEBUG_FUNCTION_PROCESS
+   printf("PROCESS OPERATOR %s\n", tt_get_name(tt_op));
+
+   token_print(p_token_next);
+   printf("\n");
+   token_print(p_token_store);
+   printf("\n");
+#endif /* DEBUG_FUNCTION_PROCESS */
+
+
+   switch (tt_op) {
+   case TT_ASSIGN:
+   {
+      Token *p_token_assign = p_interpret->p_token_temp;
+      TokenType tt_assign = token_get_tt(p_token_assign);
+
+      if (tt_assign != TT_IDENT) {
+         _FUNCTION_ERROR("Can only assign to symbols",
+                         p_token_store);
+      }
+
+      Symbol *p_symbol = scope_get(p_interpret->p_scope,
+                                   token_get_val(p_token_assign));
+
+      if (p_symbol == NULL) {
+         _FUNCTION_ERROR("No such symbol",
+                         p_token_assign);
+      }
+
+      symbol_set_val(p_symbol, p_token_store);
+      symbol_set_sym(p_symbol, SYM_VARIABLE);
+
+      return;
+   }
+
+   break;
+   NO_DEFAULT;
+   }
+
+   p_token_next = token_new_copy(p_token_next);
+   TokenType tt_highest = convert_to_highest(p_token_store, p_token_next);
+
+#ifdef DEBUG_FUNCTION_PROCESS
+   printf("===> %s %s %s\n",
+          tt_get_name(tt_highest),
+          tt_get_name(tt_op),
+          tt_get_name(tt_highest));
+#endif /* DEBUG_FUNCTION_PROCESS */
+
+   switch (tt_op) {
+   case TT_ADD:
+      switch (tt_highest) {
+      case TT_INTEGER:
+         token_set_ival(p_token_store,
+                        token_get_ival(p_token_next) +
+                        token_get_ival(p_token_store));
+         break;
+      case TT_DOUBLE:
+         token_set_dval(p_token_store,
+                        token_get_dval(p_token_next) +
+                        token_get_dval(p_token_store));
+      case TT_STRING:
+         token_set_ival(p_token_store,
+                        atoi(token_get_val(p_token_next)) +
+                        atoi(token_get_val(p_token_store)));
+         token_set_tt(p_token_store, TT_INTEGER);
+         break;
+         NO_DEFAULT;
+      }
+      break;
+   case TT_SUB:
+      switch (tt_highest) {
+      case TT_INTEGER:
+         token_set_ival(p_token_store,
+                        token_get_ival(p_token_next) -
+                        token_get_ival(p_token_store));
+         break;
+      case TT_DOUBLE:
+         token_set_dval(p_token_store,
+                        token_get_dval(p_token_next) -
+                        token_get_dval(p_token_store));
+         break;
+      case TT_STRING:
+         token_set_ival(p_token_store,
+                        atoi(token_get_val(p_token_next)) -
+                        atoi(token_get_val(p_token_store)));
+         token_set_tt(p_token_store, TT_INTEGER);
+         break;
+         NO_DEFAULT;
+      }
+      break;
+   case TT_MULT:
+      switch (tt_highest) {
+      case TT_INTEGER:
+         token_set_ival(p_token_store,
+                        token_get_ival(p_token_next) *
+                        token_get_ival(p_token_store));
+         break;
+      case TT_DOUBLE:
+         token_set_dval(p_token_store,
+                        token_get_dval(p_token_next) *
+                        token_get_dval(p_token_store));
+         break;
+      case TT_STRING:
+         token_set_ival(p_token_store,
+                        atoi(token_get_val(p_token_next)) *
+                        atoi(token_get_val(p_token_store)));
+         token_set_tt(p_token_store, TT_INTEGER);
+         break;
+         NO_DEFAULT;
+      }
+      break;
+   case TT_DIV:
+      switch (tt_highest) {
+      case TT_INTEGER:
+         token_set_ival(p_token_store,
+                        (int) token_get_ival(p_token_next) /
+                        token_get_ival(p_token_store));
+         break;
+      case TT_DOUBLE:
+         token_set_dval(p_token_store,
+                        token_get_dval(p_token_next) /
+                        token_get_dval(p_token_store));
+         break;
+      case TT_STRING:
+         token_set_dval(p_token_store,
+                        atof(token_get_val(p_token_next)) /
+                        atof(token_get_val(p_token_store)));
+         token_set_tt(p_token_store, TT_DOUBLE);
+         break;
+         NO_DEFAULT;
+      }
+      break;
+   case TT_EQ:
+      switch (tt_highest) {
+      case TT_INTEGER:
+         token_set_ival(p_token_store,
+                        (int) token_get_ival(p_token_next) ==
+                        token_get_ival(p_token_store));
+         break;
+      case TT_DOUBLE:
+         token_set_ival(p_token_store,
+                        token_get_dval(p_token_next) ==
+                        token_get_dval(p_token_store));
+         token_set_tt(p_token_store, TT_INTEGER);
+         break;
+      case TT_STRING:
+         token_set_ival(p_token_store,
+                        strcmp(token_get_val(p_token_next),
+                               token_get_val(p_token_store)) == 0);
+         token_set_tt(p_token_store, TT_INTEGER);
+         break;
+         NO_DEFAULT;
+      }
+      break;
+   case TT_NEQ:
+      switch (tt_highest) {
+      case TT_INTEGER:
+         token_set_ival(p_token_store,
+                        (int) token_get_ival(p_token_next) !=
+                        token_get_ival(p_token_store));
+         break;
+      case TT_DOUBLE:
+         token_set_ival(p_token_store,
+                        token_get_dval(p_token_next) !=
+                        token_get_dval(p_token_store));
+         token_set_tt(p_token_store, TT_INTEGER);
+         break;
+      case TT_STRING:
+         token_set_ival(p_token_store,
+                        strcmp(token_get_val(p_token_next),
+                               token_get_val(p_token_store)) != 0);
+         token_set_tt(p_token_store, TT_INTEGER);
+         break;
+         NO_DEFAULT;
+      }
+      break;
+   case TT_LT:
+      switch (tt_highest) {
+      case TT_INTEGER:
+         token_set_ival(p_token_store,
+                        (int) token_get_ival(p_token_next) <
+                        token_get_ival(p_token_store));
+         break;
+      case TT_DOUBLE:
+         token_set_ival(p_token_store,
+                        token_get_dval(p_token_next) <
+                        token_get_dval(p_token_store));
+         token_set_tt(p_token_store, TT_INTEGER);
+         break;
+      case TT_STRING:
+         token_set_ival(p_token_store,
+                        strcmp(token_get_val(p_token_next),
+                               token_get_val(p_token_store)) < 0);
+         token_set_tt(p_token_store, TT_INTEGER);
+         break;
+         NO_DEFAULT;
+      }
+      break;
+   case TT_GT:
+      switch (tt_highest) {
+      case TT_INTEGER:
+         token_set_ival(p_token_store,
+                        (int) token_get_ival(p_token_next) >
+                        token_get_ival(p_token_store));
+         break;
+      case TT_DOUBLE:
+         token_set_ival(p_token_store,
+                        token_get_dval(p_token_next) >
+                        token_get_dval(p_token_store));
+         token_set_tt(p_token_store, TT_INTEGER);
+         break;
+      case TT_STRING:
+         token_set_ival(p_token_store,
+                        strcmp(token_get_val(p_token_next),
+                               token_get_val(p_token_store)) > 0);
+         token_set_tt(p_token_store, TT_INTEGER);
+         break;
+         NO_DEFAULT;
+      }
+      break;
+   case TT_LE:
+      switch (tt_highest) {
+      case TT_INTEGER:
+         token_set_ival(p_token_store,
+                        (int) token_get_ival(p_token_next) <=
+                        token_get_ival(p_token_store));
+         break;
+      case TT_DOUBLE:
+         token_set_ival(p_token_store,
+                        token_get_dval(p_token_next) <=
+                        token_get_dval(p_token_store));
+         token_set_tt(p_token_store, TT_INTEGER);
+         break;
+      case TT_STRING:
+         token_set_ival(p_token_store,
+                        strcmp(token_get_val(p_token_next),
+                               token_get_val(p_token_store)) <= 0);
+         token_set_tt(p_token_store, TT_INTEGER);
+         break;
+         NO_DEFAULT;
+      }
+      break;
+   case TT_GE:
+      switch (tt_highest) {
+      case TT_INTEGER:
+         token_set_ival(p_token_store,
+                        (int) token_get_ival(p_token_next) >=
+                        token_get_ival(p_token_store));
+         break;
+      case TT_DOUBLE:
+         token_set_ival(p_token_store,
+                        token_get_dval(p_token_next) >=
+                        token_get_dval(p_token_store));
+         token_set_tt(p_token_store, TT_INTEGER);
+         break;
+      case TT_STRING:
+         token_set_ival(p_token_store,
+                        strcmp(token_get_val(p_token_next),
+                               token_get_val(p_token_store)) >= 0);
+         token_set_tt(p_token_store, TT_INTEGER);
+         break;
+         NO_DEFAULT;
+      }
+      break;
+   default:
+      _FUNCTION_ERROR("No such function/operator", p_token_op);
+   }
+
+#ifdef DEBUG_FUNCTION_PROCESS
+   token_print(p_token_store);
+   printf("\n\n");
+#endif /* DEBUG_FUNCTION_PROCESS */
+
+   token_delete(p_token_next);
+}
+
+void
+function_process(Interpret *p_interpret, Token *p_token_op,
+                 Stack *p_stack_args, int i_args) {
+
+   Token *p_token_store = token_new_copy(stack_pop(p_stack_args));
+
+   for (int i = 0; i < i_args -1 && !stack_empty(p_stack_args); ++i) {
+      Token *p_token_next = stack_pop(p_stack_args);
+
+      _process(p_interpret, p_token_store, p_token_op, p_token_next);
+   }
+
+   stack_push(p_stack_args, p_token_store);
+}
+
+_Bool
+function_is_buildin(Token *p_token_ident) {
+   if (strcmp("assert", token_get_val(p_token_ident)) == 0)
+      return (true);
+
+   if (strcmp("decr", token_get_val(p_token_ident)) == 0)
+      return (true);
+
+   if (strcmp("double", token_get_val(p_token_ident)) == 0)
+      return (true);
+
+   if (strcmp("end", token_get_val(p_token_ident)) == 0)
+      return (true);
+
+   if (strcmp("exit", token_get_val(p_token_ident)) == 0)
+      return (true);
+
+   if (strcmp("fork", token_get_val(p_token_ident)) == 0)
+      return (true);
+
+   if (strcmp("gc", token_get_val(p_token_ident)) == 0)
+      return (true);
+
+   if (strcmp("incr", token_get_val(p_token_ident)) == 0)
+      return (true);
+
+   if (strcmp("integer", token_get_val(p_token_ident)) == 0)
+      return (true);
+
+   if (strcmp("ln", token_get_val(p_token_ident)) == 0)
+      return (true);
+
+   if (strcmp("neg", token_get_val(p_token_ident)) == 0)
+      return (true);
+
+   if (strcmp("no", token_get_val(p_token_ident)) == 0)
+      return (true);
+
+   if (strcmp("put", token_get_val(p_token_ident)) == 0)
+      return (true);
+
+   if (strcmp("say", token_get_val(p_token_ident)) == 0)
+      return (true);
+
+   if (strcmp("string", token_get_val(p_token_ident)) == 0)
+      return (true);
+
+   if (strcmp("yes", token_get_val(p_token_ident)) == 0)
+      return (true);
+
+   return (false);
+}
+
+void
+function_process_buildin(Interpret *p_interpret, Token *p_token_ident,
+                         Stack *p_stack_args) {
+
+   if (strcmp("assert", token_get_val(p_token_ident)) == 0) {
+      if (0 == stack_size(p_stack_args))
+         _FUNCTION_ERROR("No argument given", p_token_ident);
+
+      Token *p_token = stack_top(p_stack_args);
+
+      switch (token_get_tt(p_token)) {
+      case TT_INTEGER:
+         if (token_get_ival(p_token) == 0)
+            _FUNCTION_ERROR("Assert failed", p_token);
+         break;
+      case TT_DOUBLE:
+         if (token_get_dval(p_token) == 0)
+            _FUNCTION_ERROR("Assert failed", p_token);
+         break;
+      case TT_STRING:
+         if (atoi(token_get_val(p_token)) == 0)
+            _FUNCTION_ERROR("Assert failed", p_token);
+         break;
+         NO_DEFAULT;
+      }
+
+   } else if (strcmp("decr", token_get_val(p_token_ident)) == 0) {
+      if (0 == stack_size(p_stack_args))
+         _FUNCTION_ERROR("No argument given", p_token_ident);
+
+      Token *p_token = stack_top(p_stack_args);
+      switch (token_get_tt(p_token)) {
+      case TT_INTEGER:
+         token_set_ival(p_token, token_get_ival(p_token) - 1);
+         break;
+      case TT_DOUBLE:
+         token_set_dval(p_token, token_get_dval(p_token) - 1);
+         break;
+      case TT_STRING:
+         convert_to_integer(p_token);
+         token_set_ival(p_token, token_get_ival(p_token) - 1);
+         break;
+         NO_DEFAULT;
+      }
+
+   } else if (strcmp("double", token_get_val(p_token_ident)) == 0) {
+      if (0 == stack_size(p_stack_args))
+         _FUNCTION_ERROR("No argument given", p_token_ident);
+
+      Token *p_token = token_new_copy(stack_pop(p_stack_args));
+      convert_to_double(p_token);
+      stack_push(p_stack_args, p_token);
+
+   } else if (strcmp("end", token_get_val(p_token_ident)) == 0) {
+      exit(0);
+
+   } else if (strcmp("fork", token_get_val(p_token_ident)) == 0) {
+      Token *p_token = token_new_integer((int) fork());
+      stack_push(p_stack_args, p_token);
+
+   } else if (strcmp("gc", token_get_val(p_token_ident)) == 0) {
+      int i_count = garbage_collect();
+      printf("ICOUNT %d\n", i_count);
+      Token *p_token = token_new_integer(i_count);
+      stack_push(p_stack_args, p_token);
+
+   } else if (strcmp("exit", token_get_val(p_token_ident)) == 0) {
+      if (0 == stack_size(p_stack_args))
+         _FUNCTION_ERROR("No argument given", p_token_ident);
+
+      Token *p_token = stack_top(p_stack_args);
+      p_token = token_new_copy(p_token);
+      convert_to_integer(p_token);
+      exit(token_get_ival(p_token));
+
+   } else if (strcmp("incr", token_get_val(p_token_ident)) == 0) {
+      if (0 == stack_size(p_stack_args))
+         _FUNCTION_ERROR("No argument given", p_token_ident);
+
+      Token *p_token = stack_top(p_stack_args);
+      switch (token_get_tt(p_token)) {
+      case TT_INTEGER:
+         token_set_ival(p_token, token_get_ival(p_token) + 1);
+         break;
+      case TT_DOUBLE:
+         token_set_dval(p_token, token_get_dval(p_token) + 1);
+         break;
+      case TT_STRING:
+         convert_to_integer(p_token);
+         token_set_ival(p_token, token_get_ival(p_token) + 1);
+         break;
+         NO_DEFAULT;
+      }
+
+   } else if (strcmp("integer", token_get_val(p_token_ident)) == 0) {
+      if (0 == stack_size(p_stack_args))
+         _FUNCTION_ERROR("No argument given", p_token_ident);
+
+      Token *p_token = token_new_copy(stack_pop(p_stack_args));
+      convert_to_integer(p_token);
+      stack_push(p_stack_args, p_token);
+
+   } else if (strcmp("ln", token_get_val(p_token_ident)) == 0) {
+      printf("\n");
+
+   } else if (strcmp("neg", token_get_val(p_token_ident)) == 0) {
+      if (0 == stack_size(p_stack_args))
+         _FUNCTION_ERROR("No argument given", p_token_ident);
+
+      Token *p_token = token_new_copy(stack_pop(p_stack_args));
+      stack_push(p_stack_args, p_token);
+
+      switch (token_get_tt(p_token)) {
+      case TT_INTEGER:
+         token_set_ival(p_token, -token_get_ival(p_token));
+         break;
+      case TT_DOUBLE:
+         token_set_dval(p_token, -token_get_dval(p_token));
+         break;
+      case TT_STRING:
+         token_set_ival(p_token, -atoi(token_get_val(p_token)));
+         token_set_tt(p_token, TT_INTEGER);
+         break;
+         NO_DEFAULT;
+      }
+
+   } else if (strcmp("no", token_get_val(p_token_ident)) == 0) {
+      Token *p_token = NULL;
+
+      if (0 == stack_size(p_stack_args)) {
+         p_token = token_new_integer(0);
+
+      } else {
+         p_token = token_new_copy(stack_pop(p_stack_args));
+
+         switch (token_get_tt(p_token)) {
+         case TT_INTEGER:
+            token_set_ival(p_token, !token_get_ival(p_token));
+            break;
+         case TT_DOUBLE:
+            token_set_dval(p_token, !token_get_dval(p_token));
+            break;
+         case TT_STRING:
+            token_set_ival(p_token, !atoi(token_get_val(p_token)));
+            token_set_tt(p_token, TT_INTEGER);
+            break;
+            NO_DEFAULT;
+         }
+      }
+
+      stack_push(p_stack_args, p_token);
+
+   } else if (strcmp("put", token_get_val(p_token_ident)) == 0) {
+      StackIterator *p_iter = stackiterator_new(p_stack_args);
+      while (stackiterator_has_next(p_iter)) {
+         Token *p_token = stackiterator_next(p_iter);
+         switch (token_get_tt(p_token)) {
+         case TT_INTEGER:
+            printf("%d", token_get_ival(p_token));
+            break;
+         case TT_DOUBLE:
+            printf("%f", token_get_dval(p_token));
+            break;
+         case TT_STRING:
+            printf("%s", token_get_val(p_token));
+            break;
+            NO_DEFAULT;
+         }
+      }
+      stackiterator_delete(p_iter);
+
+   } else if (strcmp("say", token_get_val(p_token_ident)) == 0) {
+      StackIterator *p_iter = stackiterator_new(p_stack_args);
+      while (stackiterator_has_next(p_iter)) {
+         Token *p_token = stackiterator_next(p_iter);
+         switch (token_get_tt(p_token)) {
+         case TT_INTEGER:
+            printf("%d", token_get_ival(p_token));
+            break;
+         case TT_DOUBLE:
+            printf("%f", token_get_dval(p_token));
+            break;
+         case TT_STRING:
+            printf("%s", token_get_val(p_token));
+            break;
+            NO_DEFAULT;
+         }
+      }
+      stackiterator_delete(p_iter);
+      printf("\n");
+
+   } else if (strcmp("string", token_get_val(p_token_ident)) == 0) {
+      if (0 == stack_size(p_stack_args))
+         _FUNCTION_ERROR("No argument given", p_token_ident);
+
+      Token *p_token = token_new_copy(stack_pop(p_stack_args));
+      convert_to_string(p_token);
+      stack_push(p_stack_args, p_token);
+
+   } else if (strcmp("yes", token_get_val(p_token_ident)) == 0) {
+      Token *p_token = NULL;
+
+      if (0 == stack_size(p_stack_args)) {
+         p_token = token_new_integer(1);
+
+      } else {
+         p_token = token_new_copy(stack_pop(p_stack_args));
+         token_set_ival(p_token, 1);
+         token_set_tt(p_token, TT_INTEGER);
+
+      }
+
+      stack_push(p_stack_args, p_token);
+   }
+}
+
+_Bool
+function_is_self_defined(Interpret *p_interpret) {
+   Symbol *p_symbol = scope_get(p_interpret->p_scope,
+                                token_get_val(p_interpret->p_token));
+
+   if (p_symbol == NULL)
+      return (false);
+
+   switch (symbol_get_sym(p_symbol)) {
+   case SYM_PROCEDURE:
+   case SYM_FUNCTION:
+      return (true);
+      NO_DEFAULT;
+   }
+
+   return (false);
+}
+
+void
+function_process_self_defined(Interpret *p_interpret, Token *p_token_ident) {
+   Symbol *p_symbol = scope_get(p_interpret->p_scope,
+                                token_get_val(p_token_ident));
+
+   switch (symbol_get_sym(p_symbol)) {
+   case SYM_PROCEDURE:
+   {
+      List *p_list_token = symbol_get_val(p_symbol);
+      interpret_subprocess(p_interpret, p_list_token);
+   }
+   break;
+   case SYM_FUNCTION:
+   {
+      List *p_list_token = symbol_get_val(p_symbol);
+      scope_up(p_interpret->p_scope);
+      interpret_subprocess(p_interpret, p_list_token);
+      scope_down(p_interpret->p_scope);
+   }
+   NO_DEFAULT;
+   }
+}
+
diff --git a/src/core/function.h b/src/core/function.h
new file mode 100644
index 0000000..9f12bb4
--- /dev/null
+++ b/src/core/function.h
@@ -0,0 +1,50 @@
+/*:*
+ *: File: ./src/core/function.h
+ *: 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.
+ *:*/
+
+#ifndef FUNCTION_H
+#define FUNCTION_H
+
+#include "token.h"
+
+#include "interpret.h"
+#include "../data/stack.h"
+
+void function_process(Interpret *p_interp, Token *p_token_op, Stack
+                      *p_stack_args, int i_args);
+_Bool function_is_buildin(Token *p_token_ident);
+void function_process_buildin(Interpret *p_interpret, Token *p_token_ident, Stack *p_stack_args);
+_Bool function_is_self_defined(Interpret *p_interpret);
+void function_process_self_defined(Interpret *p_interpret, Token *p_token_ident);
+
+#endif /* FUNCTION_H */
diff --git a/src/core/garbage.c b/src/core/garbage.c
new file mode 100644
index 0000000..b4dad22
--- /dev/null
+++ b/src/core/garbage.c
@@ -0,0 +1,136 @@
+/*:*
+ *: File: ./src/core/garbage.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 r