Moved stuff into trunk.

19 files changed, 3126 insertions, 0 deletions

diff --git a/src/data/array.c b/src/data/array.c
new file mode 100644
index 0000000..e893a6d
--- /dev/null
+++ b/src/data/array.c
@@ -0,0 +1,266 @@
+/*:*
+ *: File: ./src/data/array.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 "array.h"
+
+Array*
+array_new() {
+   Array *p_array = malloc(sizeof(Array));
+
+   p_array->i_size = 0;
+   p_array->pp_ae = NULL;
+
+   return p_array;
+}
+
+
+void
+array_delete(Array *p_array) {
+   if (!p_array)
+      return;
+
+   if (p_array->i_size)
+      for (int i = p_array->i_size - 1; i >= 0; --i)
+         arrayelement_delete(p_array->pp_ae[i]);
+
+   if (p_array->pp_ae)
+      free(p_array->pp_ae);
+
+   free(p_array);
+}
+
+void
+array_set(Array *p_array, int i_index, void *p_val) {
+   if (p_array->i_size > i_index) {
+      p_array->pp_ae[i_index]->p_val = p_val;
+
+   } else {
+      array_resize(p_array, i_index + 1);
+      p_array->pp_ae[i_index]->p_val = p_val;
+   }
+}
+
+void
+array_insert(Array *p_array, int i_index, void *p_val) {
+   if (p_array->i_size <= i_index) {
+      array_set(p_array, i_index, p_val);
+
+   } else {
+      array_resize(p_array, p_array->i_size + 1);
+
+      ArrayElement *p_ae = p_array->pp_ae[p_array->i_size-1];
+      int i;
+      for (i = p_array->i_size - 1; i > i_index; --i)
+         p_array->pp_ae[i] = p_array->pp_ae[i-1];
+
+      p_array->pp_ae[i] = p_ae;
+      p_ae->p_val = p_val;
+   }
+}
+
+void*
+array_remove(Array *p_array, int i_index) {
+   if (p_array->i_size <= i_index)
+      return NULL;
+
+   ArrayElement *p_ae = p_array->pp_ae[i_index];
+   void *p_ret = p_ae->p_val;
+   int i;
+
+   for (i = i_index+1; i < p_array->i_size; ++i)
+      p_array->pp_ae[i-1] = p_array->pp_ae[i];
+
+   p_array->pp_ae[i-1] = p_ae;
+
+   array_resize(p_array, p_array->i_size - 1);
+
+   return p_ret;
+}
+
+void
+array_print_int(Array *p_array) {
+   printf("Array:");
+   for (int i = 0; i < p_array->i_size; ++i)
+      printf(" (%d,%d)", i, (int) array_get(p_array, i));
+   printf("\n");
+}
+
+void
+array_resize(Array *p_array, int i_size) {
+   if (i_size == p_array->i_size)
+      return;
+
+   if (i_size < p_array->i_size)
+      for (int i = p_array->i_size - 1; i >= i_size; --i)
+         arrayelement_delete(p_array->pp_ae[i]);
+
+   if (i_size == 0) {
+      free(p_array->pp_ae);
+      p_array->pp_ae = NULL;
+
+   } else if (p_array->pp_ae != NULL) {
+      p_array->pp_ae = realloc(p_array->pp_ae,
+                               sizeof(ArrayElement) * i_size);
+
+   } else {
+      p_array->pp_ae = malloc(sizeof(ArrayElement) * i_size);
+   }
+
+   if (i_size > p_array->i_size)
+      for (int i = p_array->i_size; i < i_size; ++i)
+         p_array->pp_ae[i] = arrayelement_new(NULL);
+
+   p_array->i_size = i_size;
+}
+
+void*
+array_get(Array *p_array, int i_index) {
+   if (p_array->i_size > i_index)
+      return p_array->pp_ae[i_index]->p_val;
+
+   return NULL;
+}
+
+_Bool
+array_defined(Array *p_array, int i_index) {
+   if (i_index >= p_array->i_size)
+      return false;
+
+   return p_array->pp_ae[i_index]->p_val != NULL;
+}
+
+void
+array_splice(Array *p_array, int i_index, Array *p_array2) {
+   if (i_index >= array_get_size(p_array))
+      return;
+
+   array_remove(p_array, i_index);
+
+   int i_size1= array_get_size(p_array);
+   int i_size2 = array_get_size(p_array2);
+   int i_size = i_size1 + i_size2;
+
+   array_resize(p_array, i_size);
+
+   for (int i = i_size1 - 1; i >= i_index; --i)
+      p_array->pp_ae[i+i_size2]->p_val = p_array->pp_ae[i]->p_val;
+
+   for (int i = 0; i < i_size2; ++i)
+      p_array->pp_ae[i+i_index]->p_val = p_array2->pp_ae[i]->p_val;
+
+}
+
+void
+array_unshift(Array *p_array, void *p_void) {
+   int i_size = array_get_size(p_array);
+   array_set(p_array, i_size, p_void);
+}
+
+void
+array_push(Array *p_array, void *p_void) {
+   int i_size = array_get_size(p_array);
+   array_resize(p_array, ++i_size);
+
+   for (int i = i_size - 1; i > 0; --i)
+      p_array->pp_ae[i]->p_val = p_array->pp_ae[i-1]->p_val;
+
+   array_set(p_array, 0, p_void);
+}
+
+void
+array_iterate(Array *p_array, void (*func)(void *)) {
+   if (!p_array)
+      return;
+
+   for (int i = 0; i < array_get_size(p_array); ++i)
+      (*func) (array_get(p_array, i));
+}
+
+void
+array_iterate2(Array *p_array, void (*func)(void *, void *), void *p_void) {
+   if (!p_array)
+      return;
+
+   for (int i = 0; i < array_get_size(p_array); ++i)
+      (*func) (array_get(p_array, i), p_void);
+}
+
+ArrayElement*
+arrayelement_new(void *p_val) {
+   ArrayElement *p_ae = malloc(sizeof(ArrayElement));
+
+   p_ae->p_val = p_val;
+
+   return p_ae;
+}
+
+void
+arrayelement_delete(ArrayElement *p_ae) {
+   if (!p_ae)
+      return;
+
+   free(p_ae);
+}
+
+ArrayIterator*
+arrayiterator_new(Array *p_array) {
+   if (!p_array)
+      return NULL;
+
+   ArrayIterator *p_arrayiterator = malloc(sizeof(ArrayIterator));
+   p_arrayiterator->p_array = p_array;
+   p_arrayiterator->i_cur_pos = 0;
+
+   return p_arrayiterator;
+}
+
+void
+arrayiterator_delete(ArrayIterator *p_arrayiterator) {
+   if (p_arrayiterator)
+      free(p_arrayiterator);
+}
+
+_Bool
+arrayiterator_has_next(ArrayIterator *p_arrayiterator) {
+   return p_arrayiterator->i_cur_pos <
+          array_get_size(p_arrayiterator->p_array);
+}
+
+void*
+arrayiterator_next(ArrayIterator *p_arrayiterator) {
+   if (!arrayiterator_has_next(p_arrayiterator))
+      return NULL;
+
+   return array_get(p_arrayiterator->p_array, p_arrayiterator->i_cur_pos++);
+}
diff --git a/src/data/array.h b/src/data/array.h
new file mode 100644
index 0000000..a60fa03
--- /dev/null
+++ b/src/data/array.h
@@ -0,0 +1,86 @@
+/*:*
+ *: File: ./src/data/array.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 ARRAY_H
+#define ARRAY_H
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "../defines.h"
+
+#define array_get_size(a) a->i_size
+#define array_empty(a) a->i_size == 0
+#define array_clear(a) array_resize(a, 0)
+#define array_get_first(a) array_get(a, 0)
+#define array_get_last(a) array_get(a, array_get_size(a)-1)
+
+typedef struct {
+   void *p_val;
+} ArrayElement;
+
+typedef struct {
+   ArrayElement **pp_ae;
+   int i_size;
+} Array;
+
+typedef struct {
+   Array *p_array;
+   int i_cur_pos;
+} ArrayIterator;
+
+Array *array_new();
+void array_delete(Array *p_array);
+void array_set(Array *p_array, int i_index, void *p_val);
+void array_insert(Array *p_array, int i_index, void *p_val);
+void *array_remove(Array *p_array, int i_index);
+void *array_get(Array *p_array, int i_index);
+void array_resize(Array *p_array, int i_size);
+_Bool array_defined(Array *p_array, int i_index);
+void array_print_int(Array *p_array);
+void array_splice(Array *p_array, int i_index, Array *p_array2);
+void array_push(Array *p_array, void *p_void);
+void array_unshift(Array *p_array, void *p_void);
+void array_iterate(Array *p_array, void (*func)(void *));
+void array_iterate2(Array *p_array, void (*func)(void *, void *),
+                    void *p_void);
+
+ArrayElement *arrayelement_new(void *p_val);
+void arrayelement_delete(ArrayElement *p_ae);
+
+ArrayIterator *arrayiterator_new(Array *p_array);
+void arrayiterator_delete(ArrayIterator *p_arrayiterator);
+_Bool arrayiterator_has_next(ArrayIterator *p_arrayiterator);
+void *arrayiterator_next(ArrayIterator *p_arrayiterator);
+#endif
diff --git a/src/data/dat.c b/src/data/dat.c
new file mode 100644
index 0000000..1becf25
--- /dev/null
+++ b/src/data/dat.c
@@ -0,0 +1,267 @@
+/*:*
+ *: File: ./src/data/dat.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 "dat.h"
+
+#include <stdlib.h>
+
+Dat*
+dat_new() {
+   Dat *p_dat = (Dat *) malloc(sizeof(Dat));
+
+   p_dat->p_first = 0;
+   p_dat->p_last = 0;
+   p_dat->i_size = 0;
+
+   return p_dat;
+}
+
+DatElem*
+datelem_new() {
+   return datelem_new_t(TYPE_UNKNOWN);
+}
+
+DatElem*
+datelem_new_t(TYPE type) {
+   DatElem *p_elem = (DatElem *) malloc(sizeof(DatElem));
+
+   p_elem->p_next = 0;
+   p_elem->p_val = 0;
+   p_elem->type = type;
+
+   return p_elem;
+}
+
+_Bool
+dat_empty(Dat *p_dat) {
+   if (p_dat == NULL)
+      return 0;
+
+   return p_dat->i_size == 0;
+}
+
+void
+dat_push(Dat *p_dat, void *p_val) {
+   dat_push_t(p_dat, p_val, TYPE_UNKNOWN);
+}
+
+void
+dat_push_t(Dat *p_dat, void *p_val, TYPE type) {
+   DatElem *p_elem = datelem_new_t(type);
+   p_elem->p_val = p_val;
+
+   if (0 == p_dat->i_size++)
+      p_dat->p_first = p_elem;
+   else
+      p_dat->p_last->p_next = p_elem;
+
+   p_dat->p_last = p_elem;
+}
+
+void*
+dat_pop(Dat *p_dat) {
+   TYPE type;
+   return dat_pop_t(p_dat, &type);
+}
+
+void*
+dat_pop_t(Dat *p_dat, TYPE *p_type) {
+   if (dat_empty(p_dat))
+      return 0;
+
+   DatElem *p_elem = p_dat->p_first;
+   p_dat->p_first = p_elem->p_next;
+
+   --p_dat->i_size;
+
+   void *p_ret =  p_elem->p_val;
+   *p_type = p_elem->type;
+   free(p_elem);
+   return p_ret;
+}
+
+void
+dat_clear(Dat *p_dat) {
+   for (;!dat_empty(p_dat); dat_pop(p_dat));
+}
+
+void
+dat_delete(Dat *p_dat) {
+   dat_clear(p_dat);
+   free(p_dat);
+}
+
+unsigned
+dat_size(Dat *p_dat) {
+   return p_dat->i_size;
+}
+
+void
+dat_iterate(Dat *p_dat, void (*func)(void *)) {
+   DatElem *p_elem = p_dat->p_first;
+   while (p_elem) {
+      if (p_elem->p_val)
+         (*func) (p_elem->p_val);
+
+      p_elem = p_elem->p_next;
+   }
+}
+
+void
+dat_iterate_t(Dat *p_dat, void (*func)(void *, TYPE)) {
+   DatElem *p_elem = p_dat->p_first;
+   while (p_elem) {
+      if (p_elem->p_val)
+         (*func) (p_elem->p_val, p_elem->type);
+
+      p_elem = p_elem->p_next;
+   }
+}
+
+void
+dat_iterate_tl(Dat *p_dat, void (*func)(void *, TYPE, _Bool)) {
+   DatElem *p_elem = p_dat->p_first;
+   while (p_elem) {
+      if (p_elem->p_val)
+         (*func) (p_elem->p_val, p_elem->type, p_elem->p_next == NULL);
+
+      p_elem = p_elem->p_next;
+   }
+}
+
+void*
+dat_first(Dat *p_dat) {
+   if (dat_empty(p_dat))
+      return NULL;
+
+   return p_dat->p_first->p_val;
+}
+
+void*
+dat_second(Dat *p_dat) {
+   if ( 2 > dat_size(p_dat))
+      return NULL;
+
+   return p_dat->p_first->p_next->p_val;
+}
+
+void*
+dat_last(Dat *p_dat) {
+   if (dat_empty(p_dat))
+      return NULL;
+
+   return p_dat->p_last->p_val;
+}
+
+void*
+dat_first_t(Dat *p_dat, TYPE *p_type) {
+   if (dat_empty(p_dat))
+      return NULL;
+
+   *p_type = p_dat->p_first->type;
+   return p_dat->p_first->p_val;
+}
+
+void*
+dat_second_t(Dat *p_dat, TYPE *p_type) {
+   if ( 2 > dat_size(p_dat))
+      return NULL;
+
+   *p_type = p_dat->p_first->p_next->type;
+   return p_dat->p_first->p_next->p_val;
+}
+
+void*
+dat_last_t(Dat *p_dat, TYPE *p_type) {
+   if (dat_empty(p_dat))
+      return NULL;
+
+   *p_type = p_dat->p_last->type;
+   return p_dat->p_last->p_val;
+}
+
+DatIter*
+datiter_new(Dat *p_dat) {
+   DatIter *p_iter =
+      (DatIter *) malloc(sizeof(DatIter));
+
+   p_iter->p_current = NULL;
+   p_iter->p_next = p_dat->p_first;
+   p_iter->i_left = dat_size(p_dat);
+   p_iter->p_dat = p_dat;
+
+   return p_iter;
+}
+
+void
+datiter_delete(DatIter *p_iter) {
+   free(p_iter);
+}
+
+void
+datiter_skip(DatIter *p_iter, unsigned i_num) {
+   for (int i = 0; i < i_num; ++i)
+      datiter_next(p_iter);
+}
+
+void*
+datiter_next(DatIter *p_iter) {
+   TYPE type;
+   return datiter_next_t(p_iter, &type);
+}
+
+void*
+datiter_next_t(DatIter *p_iter, TYPE *p_type) {
+   if (p_iter->p_next == NULL)
+      return NULL;
+
+   void *p_ret = p_iter->p_next->p_val;
+   *p_type = p_iter->p_next->type;
+   p_iter->p_current = p_iter->p_next;
+   p_iter->p_next = p_iter->p_next->p_next;
+   --p_iter->i_left;
+
+   return p_ret;
+}
+
+unsigned
+datiter_left(DatIter *p_iter) {
+   return p_iter->i_left;
+}
+
+Dat*
+datiter_dat(DatIter *p_iter) {
+   return p_iter->p_dat;
+}
+
diff --git a/src/data/dat.h b/src/data/dat.h
new file mode 100644
index 0000000..82264e4
--- /dev/null
+++ b/src/data/dat.h
@@ -0,0 +1,88 @@
+/*:*
+ *: File: ./src/data/dat.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 DAT_H
+#define DAT_H
+
+#include "types.h"
+
+typedef struct DatElem_ {
+   struct DatElem_ *p_next;
+   void *p_val;
+   TYPE type;
+} DatElem;
+
+typedef struct {
+   DatElem *p_first;
+   DatElem *p_last;
+   unsigned i_size;
+} Dat;
+
+typedef struct {
+   unsigned i_left;
+   Dat *p_dat;
+   DatElem *p_current;
+   DatElem *p_next;
+} DatIter;
+
+Dat *dat_new();
+DatElem *datelem_new();
+DatElem *datelem_new_t(TYPE type);
+_Bool dat_empty(Dat *p_dat);
+void dat_push(Dat *p_dat, void *p_val);
+void dat_push_t(Dat *p_dat, void *p_val, TYPE type);
+void *dat_pop(Dat *p_dat);
+void *dat_pop_t(Dat *p_dat, TYPE *p_type);
+void dat_clear(Dat *p_dat);
+void dat_delete(Dat *p_dat);
+unsigned dat_size(Dat *p_dat);
+void dat_iterate(Dat *p_dat, void (*func)(void *));
+void dat_iterate_t(Dat *p_dat, void (*func)(void *, TYPE));
+void dat_iterate_tl(Dat *p_dat, void (*func)(void *, TYPE, _Bool));
+void *dat_first(Dat *p_dat);
+void *dat_second(Dat *p_dat);
+void *dat_last(Dat *p_dat);
+void *dat_first_t(Dat *p_dat, TYPE *p_type);
+void *dat_second_t(Dat *p_dat, TYPE *p_type);
+void *dat_last_t(Dat *p_dat, TYPE *p_type);
+
+DatIter *datiter_new(Dat *p_dat);
+void datiter_delete(DatIter *p_iter);
+void datiter_skip(DatIter *p_iter, unsigned i_num);
+void *datiter_next(DatIter *p_iter);
+void *datiter_next_t(DatIter *p_iter, TYPE *p_type);
+unsigned datiter_left(DatIter *p_iter);
+Dat *datiter_dat(DatIter *p_iter);
+
+#endif
diff --git a/src/data/hash.c b/src/data/hash.c
new file mode 100644
index 0000000..cc32a6b
--- /dev/null
+++ b/src/data/hash.c
@@ -0,0 +1,290 @@
+/*:*
+ *: File: ./src/data/hash.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 "hash.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+Hash*
+hash_new(unsigned i_size) {
+   Hash *p_hash = (Hash *) malloc(sizeof(Hash));
+
+   p_hash->i_size = i_size;
+   p_hash->i_cur_size = 0;
+   p_hash->p_elems = (HashElem *) calloc(i_size, sizeof(HashElem));
+
+   /*Set all positions as "free" */
+   for (int i = 0; i < i_size; ++i)
+      p_hash->p_elems[i].flag = 'f';
+
+   return p_hash;
+}
+
+void
+hash_delete(Hash *p_hash) {
+   if (p_hash->p_elems) {
+      free(p_hash->p_elems);
+      p_hash->p_elems = 0;
+   }
+
+   free(p_hash);
+}
+
+RETCODE
+hash_insert_ht(Hash *p_hash, char *c_key, void *p_val, TYPE type) {
+   if (p_hash->i_cur_size == p_hash->i_size)
+      hash_size(p_hash, p_hash->i_size *2);
+
+   int i_addr = hash_getaddr(p_hash, c_key, free_ADDR);
+
+   if (i_addr == RET_ERROR )
+      return RET_NO_SPACE;
+
+   strncpy(p_hash->p_elems[i_addr].c_key, c_key, HASH_MKEYLEN);
+
+   p_hash->p_elems[i_addr].flag = 'o';
+   p_hash->p_elems[i_addr].type = type;
+   p_hash->p_elems[i_addr].p_val = p_val;
+   p_hash->i_cur_size++;
+
+   return RET_OK;
+}
+
+RETCODE
+hash_insert(Hash *p_hash, char *c_key, void *p_val) {
+   return hash_insert_ht(p_hash, c_key, p_val, TYPE_VOIDP);
+}
+
+void*
+hash_remove(Hash *p_hash, char *c_key) {
+   if (p_hash->i_cur_size < p_hash->i_size / 3)
+      hash_size(p_hash, p_hash->i_size / 2);
+
+   int i_addr = hash_getaddr(p_hash, c_key, OCC_ADDR);
+
+   if (i_addr == -1 )
+      return 0;
+
+   void *p_val = p_hash->p_elems[i_addr].p_val;
+   p_hash->p_elems[i_addr].flag = 'm';
+   p_hash->p_elems[i_addr].p_val = 0;
+   --p_hash->i_cur_size;
+
+   return p_val;
+}
+
+void*
+hash_get_ht(Hash *p_hash, char *c_key, TYPE *p_type) {
+   int i_addr;
+   return hash_get_ht_addr(p_hash, c_key, p_type, &i_addr);
+}
+
+void*
+hash_get_ht_addr(Hash *p_hash, char *c_key, TYPE *p_type, int *p_addr) {
+   int i_addr = *p_addr = hash_getaddr(p_hash, c_key, OCC_ADDR);
+
+   if (i_addr == -1 )
+      return 0;
+
+   *p_type = p_hash->p_elems[i_addr].type;
+   return p_hash->p_elems[i_addr].p_val;
+}
+
+void*
+hash_get(Hash *p_hash, char *c_key) {
+   TYPE type;
+   return hash_get_ht(p_hash, c_key, &type);
+}
+
+int
+hash_getaddr(Hash *p_hash, char *c_key, HASH_OP OP) {
+   int i_len = strlen(c_key);
+   int i_addr = 0;
+
+   if (i_len > HASH_MKEYLEN) {
+      ERROR(": Key length %d is greater than HASH_MKEYLEN = %d!",
+            i_len, HASH_MKEYLEN);
+      //i_len = HASH_MKEYLEN;
+   }
+
+   for (int i= 0; i < i_len; ++i)
+      i_addr = (i_addr *p_hash->i_size + (int) c_key[i]) % p_hash->i_size;
+
+   switch (OP) {
+   case free_ADDR:
+      if (!hash_addrisfree(p_hash,i_addr))
+         return i_addr;
+      break;
+
+   case OCC_ADDR:
+      if (!hash_addrisocc(p_hash,i_addr, c_key))
+         return i_addr;
+      break;
+
+   default:
+      return RET_ERROR;
+   }
+
+   return hash_nextaddr(p_hash, p_hash->i_size, c_key, i_addr, OP);
+}
+
+RETCODE
+hash_addrisfree(Hash *p_hash, int i_addr) {
+   if (p_hash->p_elems[i_addr].flag == 'f' ||
+         p_hash->p_elems[i_addr].flag == 'm')
+      return RET_OK;
+
+   return RET_ERROR;
+}
+
+RETCODE
+hash_addrisocc(Hash *p_hash, int i_addr, char *c_key) {
+   if (p_hash->p_elems[i_addr].flag == 'o' &&
+         !strcmp(p_hash->p_elems[i_addr].c_key, c_key))
+      return RET_OK;
+
+   return RET_ERROR;
+}
+
+int
+hash_nextaddr(Hash *p_hash, int i_max_tries, char *c_key, int i_addr,
+              HASH_OP OP) {
+   if ( --i_max_tries < 0 )
+      return RET_ERROR;
+
+   i_addr = (i_addr + 1) % p_hash->i_size;
+
+   switch (OP) {
+   case free_ADDR:
+      if (!hash_addrisfree(p_hash,i_addr))
+         return i_addr;
+      break;
+
+   case OCC_ADDR:
+      if (!hash_addrisocc(p_hash,i_addr, c_key))
+         return i_addr;
+      break;
+   }
+
+   return hash_nextaddr(p_hash, i_max_tries, c_key, i_addr, OP);
+}
+
+void
+hash_print(Hash *p_hash) {
+   printf("hash_print [size:%d,cur:%d] syntax (flag[,key][=TYPE[<val>]]):\n -> ",
+          p_hash->i_size,p_hash->i_cur_size);
+
+   for (int i = 0; i < p_hash->i_size; ++i) {
+      switch (p_hash->p_elems[i].flag) {
+      case 'f':
+         printf("(f");
+         break;
+      case 'm':
+         printf("(m,%s=", p_hash->p_elems[i].c_key);
+         hash_print_addrval(p_hash, i);
+         break;
+      case 'o':
+         printf("(o,%s=", p_hash->p_elems[i].c_key);
+         hash_print_addrval(p_hash, i);
+         break;
+      }
+      printf(") ");
+   }
+
+   printf("\n");
+
+}
+
+void
+hash_print_addrval(Hash *p_hash, int i_addr) {
+   switch (p_hash->p_elems[i_addr].type) {
+   case TYPE_NUMBER: {
+      double d_val = *(double *) p_hash->p_elems[i_addr].p_val;
+
+      if ( (int) d_val == d_val )
+         printf("TYPE_NUMBER<%.0f>",d_val);
+      else
+         printf("TYPE_NUMBER<%f>",d_val);
+   }
+   break;
+
+   case TYPE_STRING:
+      printf("TYPE_STRING<%s>", (char *) p_hash->p_elems[i_addr].p_val);
+      break;
+
+   case TYPE_VOIDP:
+      printf("TYPE_VOIDP");
+      break;
+
+   default:
+      printf("UNKNOWN");
+      break;
+   }
+}
+
+RETCODE
+hash_size(Hash *p_hash, int i_size) {
+   if (i_size < p_hash->i_cur_size) {
+      ERROR("The new hash has not enough elements"
+            "to contain the old hash!");
+   }
+
+   HashElem *p_old_elems = p_hash->p_elems;
+   unsigned i_old_size = p_hash->i_size;
+
+   p_hash->p_elems = (HashElem *) calloc(i_size, sizeof(HashElem));
+   p_hash->i_size = i_size;
+   p_hash->i_cur_size = 0;
+
+   /*Set all positions as "free" */
+   for (int i = 0; i < i_size; ++i)
+      p_hash->p_elems[i].flag = 'f';
+
+   for (int i = 0; i < i_old_size; ++i)
+      if (p_old_elems[i].flag == 'o')
+         hash_insert_ht(p_hash, p_old_elems[i].c_key,
+                        p_old_elems[i].p_val, p_old_elems[i].type);
+
+   free(p_old_elems);
+   return RET_OK;
+}
+
+void
+hash_iterate(Hash *p_hash, void (*func)(void *)) {
+   for (int i = 0; i < p_hash->i_size; ++i)
+      if (p_hash->p_elems[i].flag == 'o')
+         (*func) (p_hash->p_elems[i].p_val);
+}
diff --git a/src/data/hash.h b/src/data/hash.h
new file mode 100644
index 0000000..8616549
--- /dev/null
+++ b/src/data/hash.h
@@ -0,0 +1,80 @@
+/*:*
+ *: File: ./src/data/hash.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 HASH_H
+#define HASH_H
+
+#include "../defines.h"
+#include "types.h"
+
+typedef enum HASH_OP_ {
+   free_ADDR,
+   OCC_ADDR
+} HASH_OP;
+
+typedef struct {
+   char c_key[HASH_MKEYLEN];
+   char flag;
+   TYPE type;
+   void *p_val;
+} HashElem;
+
+typedef struct {
+   HashElem *p_elems;
+   unsigned i_size;
+   unsigned i_cur_size;
+} Hash;
+
+Hash*hash_new(unsigned i_size);
+void hash_delete(Hash *p_hash);
+RETCODE hash_insert(Hash *p_hash, char *c_key, void *p_val);
+RETCODE hash_insert_ht(Hash *p_hash, char *c_key, void *p_val, TYPE type);
+void*hash_get(Hash *p_hash, char *c_key);
+void*hash_get_ht(Hash *p_hash, char *c_key, TYPE *p_type);
+void*hash_get_ht_addr(Hash *p_hash, char *c_key, TYPE *p_type, int *p_addr);
+void*hash_remove(Hash *p_hash, char *c_key);
+void hash_print(Hash *p_hash);
+void hash_print_addrval(Hash *p_hash, int i_addr);
+RETCODE hash_size(Hash *p_hash, int i_size);
+
+int hash_getaddr(Hash *p_hash, char *c_key, HASH_OP OP);
+RETCODE hash_addrisfree(Hash *p_hash, int i_addr);
+RETCODE hash_addrisocc(Hash *p_hash, int i_addr, char *c_key);
+int hash_nextaddr(Hash *p_hash, int i_max_tries, char *c_key, int i_addr, HASH_OP OP);
+void hash_iterate(Hash *p_hash, void (*func)(void *));
+
+#define hash_get_cur_size(hash) hash->i_cur_size
+#define hash_get_size(hash) hash->i_size
+
+#endif
diff --git a/src/data/list.c b/src/data/list.c
new file mode 100644
index 0000000..00e5a72
--- /dev/null
+++ b/src/data/list.c
@@ -0,0 +1,458 @@
+/*:*
+ *: File: ./src/data/list.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 "list.h"
+
+List*
+list_new() {
+   List *p_list = malloc(sizeof(List));
+
+   p_list->p_first = NULL;
+   p_list->p_last = NULL;
+   p_list->i_size = 0;
+
+   return p_list;
+}
+
+void
+_list_copy_cb(void *p_void1, void *p_cpy) {
+   ListElem *p_elem = p_void1;
+   list_add_back(p_cpy, p_elem->p_val);
+}
+
+List*
+list_copy(List *p_list) {
+   List *p_list_cpy = list_new();
+   list_iterate2(p_list, _list_copy_cb, p_list_cpy);
+   return (p_list_cpy);
+}
+
+List*
+list_copy2(List *p_list, void* (*func)(void *)) {
+   List *p_list_cpy = list_new();
+   ListIterator *p_iter = listiterator_new(p_list);
+
+   while (listiterator_has_next(p_iter))
+      list_add_back(p_list_cpy, (*func) (listiterator_next(p_iter)));
+
+   listiterator_delete(p_iter);
+
+   return (p_list_cpy);
+}
+
+ListElem*
+listelem_new() {
+   ListElem *p_elem = malloc(sizeof(ListElem));
+
+   p_elem->p_next = NULL;
+   p_elem->p_prev = NULL;
+   p_elem->p_val = NULL;
+   return p_elem;
+}
+
+_Bool
+list_empty(List *p_list) {
+   return p_list->i_size == 0;
+}
+
+void
+list_concat_front(List *p_list1, List *p_list2) {
+   if (!p_list1 || !p_list2 || !p_list2->p_last)
+      return;
+
+   ListElem *p_first = p_list1->p_first;
+
+   if (!p_first) {
+      p_list1->p_first = p_list2->p_first;
+      p_list1->p_last = p_list2->p_last;
+
+   } else {
+      p_list2->p_last->p_next = p_list1->p_first;
+      p_list1->p_first->p_prev = p_list2->p_last;
+      p_list1->p_first = p_list2->p_first;
+   }
+
+   p_list1->i_size += p_list2->i_size;
+   p_list2->i_size = 0;
+   p_list2->p_first = NULL;
+   p_list2->p_last = NULL;
+}
+
+void
+list_concat_back(List *p_list1, List *p_list2) {
+   if (!p_list1 || !p_list2 || !p_list2->p_first)
+      return;
+
+   ListElem *p_last = p_list1->p_last;
+
+   if (!p_last) {
+      p_list1->p_first = p_list2->p_first;
+      p_list1->p_last = p_list2->p_last;
+
+   } else {
+      p_last->p_next = p_list2->p_first;
+      p_list2->p_first->p_prev = p_last;
+      p_list1->p_last = p_list2->p_last;
+   }
+
+   p_list1->i_size += p_list2->i_size;
+   p_list2->i_size = 0;
+   p_list2->p_first = NULL;
+   p_list2->p_last = NULL;
+
+}
+
+void
+list_add_front(List *p_list, void *p_val) {
+   ListElem *p_elem = listelem_new();
+
+   p_elem->p_val = p_val;
+   if (p_list->p_first == NULL) {
+      p_list->p_first = p_elem;
+      p_list->p_last = p_elem;
+
+   } else {
+      p_elem->p_next = p_list->p_first;
+      p_list->p_first->p_prev = p_elem;
+      p_list->p_first = p_elem;
+   }
+
+   ++p_list->i_size;
+}
+
+void
+list_add_back(List *p_list, void *p_val) {
+   ListElem *p_elem = listelem_new();
+
+   p_elem->p_val = p_val;
+   if (p_list->p_last == NULL) {
+      p_list->p_first = p_elem;
+      p_list->p_last = p_elem;
+
+   } else {
+      p_elem->p_prev = p_list->p_last;
+      p_list->p_last->p_next = p_elem;
+      p_list->p_last = p_elem;
+   }
+
+   ++p_list->i_size;
+}
+
+void*
+list_remove_front(List *p_list) {
+   if (list_empty(p_list))
+      return NULL;
+
+   ListElem *p_elem = p_list->p_first;
+   p_list->p_first = p_elem->p_next;
+
+   if (p_list->p_first)
+      p_list->p_first->p_prev = NULL;
+
+   void *p_val = p_elem->p_val;
+   free(p_elem);
+
+   --p_list->i_size;
+
+   return p_val;
+}
+
+void*
+list_remove_back(List *p_list) {
+   if (list_empty(p_list))
+      return NULL;
+
+   ListElem *p_elem = p_list->p_last;
+   p_list->p_last = p_elem->p_prev;
+   p_list->p_last->p_next = NULL;
+
+   void *p_val = p_elem->p_val;
+   free(p_elem);
+
+   --p_list->i_size;
+
+   return p_val;
+}
+
+void
+list_clear(List *p_list) {
+   for (;!list_empty(p_list); list_remove_front(p_list));
+}
+
+void
+list_clear_and_free_vals(List *p_list) {
+   void *p_void = NULL;
+   for (;!list_empty(p_list); p_void = list_remove_front(p_list))
+      if (p_void)
+         free(p_void);
+}
+
+void
+list_delete(List *p_list) {
+   list_clear(p_list);
+   free(p_list);
+}
+
+void
+list_delete_cb(void *p_list) {
+   list_delete(p_list);
+}
+
+void
+list_delete_and_free_vals(List *p_list) {
+   list_clear_and_free_vals(p_list);
+   free(p_list);
+}
+
+unsigned
+list_size(List *p_list) {
+   return p_list->i_size;
+}
+
+void
+list_iterate(List *p_list, void (*func)(void *)) {
+   ListElem *p_elem = p_list->p_first;
+
+   while (p_elem) {
+      (*func) (p_elem->p_val);
+      p_elem = p_elem->p_next;
+   }
+}
+
+void
+list_iterate2(List *p_list, void (*func)(void *, void *), void *p_void) {
+   ListElem *p_elem = p_list->p_first;
+
+   while (p_elem) {
+      (*func) (p_elem->p_val, p_void);
+      p_elem = p_elem->p_next;
+   }
+}
+
+void
+list_iterate2_ptr(List *p_list, void (*func)(void *, void *), void *p_void) {
+   ListElem *p_elem = p_list->p_first;
+
+   while (p_elem) {
+      (*func) (&p_elem->p_val, p_void);
+      p_elem = p_elem->p_next;
+   }
+}
+
+void
+list_iterate3(List *p_list, void (*func)(void *, void *, void *), void *p_void1, void *p_void2) {
+   ListElem *p_elem = p_list->p_first;
+
+   while (p_elem) {
+      (*func) (p_elem->p_val, p_void1, p_void2);
+      p_elem = p_elem->p_next;
+   }
+}
+
+void
+list_iterate3_ptr(List *p_list, void (*func)(void *, void *, void *),
+                  void *p_void1, void *p_void2) {
+   ListElem *p_elem = p_list->p_first;
+
+   while (p_elem) {
+      (*func) (&p_elem->p_val, p_void1, p_void2);
+      p_elem = p_elem->p_next;
+   }
+}
+
+void
+list_remove_elem(List *p_list, ListElem *p_elem_remove) {
+   ListElem *p_elem = p_list->p_first;
+
+   if (p_elem == p_elem_remove) {
+      p_list->p_first = p_elem->p_next;
+      p_list->p_first->p_prev = NULL;
+      --p_list->i_size;
+      return;
+   }
+
+   while ((p_elem = p_elem->p_next)) {
+      if (p_elem == p_elem_remove) {
+         ListElem *p_prev = p_elem->p_prev;
+         ListElem *p_next = p_elem->p_next;
+
+         if (p_next) {
+            p_prev->p_next = p_next;
+            p_next->p_prev = p_prev;
+
+         } else {
+            p_prev->p_next = NULL;
+            p_list->p_last = p_prev;
+         }
+
+         --p_list->i_size;
+         free(p_elem_remove);
+         return;
+      }
+   }
+}
+
+ListIterator*
+listiterator_new(List *p_list) {
+   if (!p_list)
+      return NULL;
+
+   ListIterator *p_iter = malloc(sizeof(ListIterator));
+
+   p_iter->p_cur = p_list->p_first;
+   p_iter->b_reverse = false;
+   p_iter->func = NULL;
+
+   return p_iter;
+}
+
+ListIterator*
+listiterator_new_reverse(List *p_list) {
+   if (!p_list)
+      return NULL;
+
+   ListIterator *p_iter = listiterator_new(p_list);
+
+   p_iter->p_cur = p_list->p_last;
+   p_iter->b_reverse = true;
+
+   return p_iter;
+}
+
+void
+listiterator_delete(ListIterator *p_iter) {
+   if (p_iter)
+      free(p_iter);
+}
+
+void*
+listiterator_next(ListIterator *p_iter) {
+   if (p_iter->p_cur) {
+      void *p_ret = p_iter->p_cur->p_val;
+
+      if (p_iter->b_reverse)
+         p_iter->p_cur = p_iter->p_cur->p_prev;
+
+      else
+         p_iter->p_cur = p_iter->p_cur->p_next;
+
+      if (p_iter->func)
+         return ((*p_iter->func) (p_ret));
+
+      else
+         return (p_ret);
+   }
+
+   return (NULL);
+}
+
+void*
+listiterator_prev(ListIterator *p_iter) {
+   if (p_iter->p_cur) {
+      void *p_ret = p_iter->p_cur->p_val;
+
+      if (!p_iter->b_reverse)
+         p_iter->p_cur = p_iter->p_cur->p_prev;
+
+      else
+         p_iter->p_cur = p_iter->p_cur->p_next;
+
+      if (p_iter->func)
+         return ((*p_iter->func) (p_ret));
+
+      else
+         return (p_ret);
+   }
+
+   return (NULL);
+}
+
+void*
+listiterator_current(ListIterator *p_iter) {
+   if (p_iter->p_cur)
+      return (p_iter->p_cur->p_val);
+
+   return (NULL);
+}
+
+void*
+listiterator_end(ListIterator *p_iter) {
+   void *p_ret = NULL;
+
+   while (listiterator_has_next(p_iter))
+      p_ret = listiterator_next(p_iter);
+
+   return (p_ret);
+}
+
+ListElem*
+listiterator_next_elem(ListIterator *p_iter) {
+   if (p_iter->p_cur) {
+      ListElem *p_ret = p_iter->p_cur;
+
+      p_iter->p_cur = p_iter->b_reverse ?
+                      p_iter->p_cur->p_prev : p_iter->p_cur->p_next;
+
+      return (p_ret);
+   }
+
+   return (NULL);
+}
+
+_Bool
+listiterator_has_next(ListIterator *p_iter) {
+   return (p_iter->p_cur != NULL ? true : false);
+}
+
+
+ListIteratorState*
+listiterator_get_state(ListIterator *p_iter) {
+   ListIteratorState *p_state = malloc(sizeof(ListIteratorState));
+
+   p_state->p_cur = p_iter->p_cur;
+   p_state->b_reverse = p_iter->b_reverse;
+
+   return (p_state);
+}
+
+void
+listiterator_set_state(ListIterator *p_iter, ListIteratorState *p_state) {
+   p_iter->p_cur = p_state->p_cur;
+   p_iter->b_reverse = p_state->b_reverse;
+}
+
+void
+listiteratorstate_delete(ListIteratorState *p_state) {
+   free(p_state);
+}
diff --git a/src/data/list.h b/src/data/list.h
new file mode 100644
index 0000000..cb22887
--- /dev/null
+++ b/src/data/list.h
@@ -0,0 +1,105 @@
+/*:*
+ *: File: ./src/data/list.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 LIST_H
+#define LIST_H
+
+#include <stdlib.h>
+
+#include "../defines.h"
+
+#define list_first(l) l->p_first->p_val
+#define list_last(l) l->p_last->p_val
+#define listiterator_set_callback(i,cb) i->func = cb
+
+typedef struct ListElem_ {
+   struct ListElem_ *p_next;
+   struct ListElem_ *p_prev;
+   void *p_val;
+} ListElem;
+
+typedef struct {
+   ListElem *p_first;
+   ListElem *p_last;
+   unsigned i_size;
+} List;
+
+typedef struct {
+   ListElem *p_cur;
+   _Bool b_reverse;
+   void* (*func)(void *);
+} ListIterator;
+
+typedef struct {
+   ListElem *p_cur;
+   _Bool b_reverse;
+} ListIteratorState;
+
+List *list_new();
+List *list_copy(List *p_list);
+List *list_copy2(List *p_list, void* (*func)(void *));
+ListElem *listelem_new();
+_Bool list_empty(List *p_list);
+void list_concat_front(List *p_list1, List *p_list2);
+void list_concat_back(List *p_list1, List *p_list2);
+void list_add_front(List *p_list, void *p_val);
+void list_add_back(List *p_list, void *p_val);
+void *list_remove_front(List *p_list);
+void *list_remove_back(List *p_list);
+void list_clear(List *p_list);
+void list_clear_and_free_vals(List *p_list);
+void list_delete(List *p_list);
+void list_delete_cb(void *p_list);
+void list_delete_and_free_vals(List *p_list);
+unsigned list_size(List *p_list);
+void list_iterate(List *p_list, void (*func)(void *));
+void list_iterate2_ptr(List *p_list, void (*func)(void *, void *), void *p_void);
+void list_iterate2(List *p_list, void (*func)(void *, void *), void *p_void);
+void list_iterate3(List *p_list, void (*func)(void *, void *, void *), void *p_void1, void *p_void2);
+void list_iterate3_ptr(List *p_list, void (*func)(void *, void *, void *), void *p_void1, void *p_void2);
+ListIterator *listiterator_new(List *p_list);
+ListIterator *listiterator_new_reverse(List *p_list);
+void listiterator_delete(ListIterator *p_iter);
+void *listiterator_next(ListIterator *p_iter);
+void *listiterator_prev(ListIterator *p_iter);
+void *listiterator_current(ListIterator *p_iter);
+void *listiterator_end(ListIterator *p_iter);
+_Bool listiterator_has_next(ListIterator *p_iter);
+ListElem* listiterator_next_elem(ListIterator *p_iter);
+void list_remove_elem(List *p_list, ListElem *p_elem_remove);
+ListIteratorState* listiterator_get_state(ListIterator *p_iter);
+void listiterator_set_state(ListIterator *p_iter, ListIteratorState *p_state);
+void listiteratorstate_delete(ListIteratorState *p_state);
+
+#endif
diff --git a/src/data/map.c b/src/data/map.c
new file mode 100644
index 0000000..24c8ac0
--- /dev/null
+++ b/src/data/map.c
@@ -0,0 +1,283 @@
+/*:*
+ *: File: ./src/data/map.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 "map.h"
+
+Map*
+map_new(int i_max_size) {
+   return map_new_named(i_max_size, "noname");
+}
+
+Map*
+map_new_named(int i_max_size, char *c_name) {
+   Map *p_map = malloc(sizeof(Map));
+
+   p_map->c_name = c_name;
+   p_map->pc_keys = calloc(i_max_size, sizeof(char*));
+   p_map->pp_vals = calloc(i_max_size, sizeof(void*));
+
+   for (int i = 0; i < i_max_size; ++i) {
+      p_map->pc_keys[i] = NULL;
+      p_map->pp_vals[i] = NULL;
+   }
+
+   p_map->i_size = 0;
+   p_map->i_max_size = i_max_size;
+
+   return p_map;
+}
+
+_Bool
+map_empty(Map *p_map) {
+   return p_map->i_size == 0;
+}
+
+_Bool
+map_full(Map *p_map) {
+   return p_map->i_size == p_map->i_max_size;
+}
+
+int
+map_next_free_addr(Map *p_map) {
+   for (int i = 0; i < p_map->i_max_size; ++i)
+      if (p_map->pc_keys[i] == NULL)
+         return i;
+
+   ERROR("No free space left in the map (%s)", p_map->c_name);
+
+   // This point should not be reached!
+   return 0;
+}
+
+_Bool
+map_insert(Map *p_map, char *c_key, void *p_val) {
+   int i_free_addr = map_next_free_addr(p_map);
+   int i_len = strlen(c_key);
+
+   p_map->pc_keys[i_free_addr] = STR_NEW(i_len+1);
+   strncpy(p_map->pc_keys[i_free_addr], c_key, i_len);
+   p_map->pp_vals[i_free_addr] = p_val;
+
+   ++p_map->i_size;
+   return true;
+}
+
+_Bool
+map_insert2(Map *p_map, char *c_key1, char *c_key2, void *p_val) {
+   char c_key[HASH_MKEYLEN];
+   sprintf(c_key, "%s%s%s", c_key1, SEP, c_key2);
+   return map_insert(p_map, c_key, p_val);
+}
+
+_Bool
+map_insert_if_not_exists(Map *p_map, char *c_key, void *p_val) {
+   void *p_void = map_get(p_map, c_key);
+
+   if (p_void)
+      return false;
+
+   return map_insert(p_map, c_key, p_val);
+
+   return true;
+}
+
+void
+map_remove(Map *p_map, char *c_key) {
+   if (map_empty(p_map))
+      return;
+
+   int i_index = map_get_addr(p_map, c_key);
+   if (i_index < 0)
+      return;
+
+   free(p_map->pc_keys[i_index]);
+   p_map->pc_keys[i_index] = NULL;
+   p_map->pp_vals[i_index] = NULL;
+   --p_map->i_size;
+}
+
+void*
+map_get(Map *p_map, char *c_key) {
+   if (map_empty(p_map))
+      return NULL;
+
+   int i_index = map_get_addr(p_map, c_key);
+   return i_index >= 0 ? p_map->pp_vals[i_index] : NULL;
+}
+
+void*
+map_get2(Map *p_map, char *c_key1, char *c_key2) {
+   char c_key[HASH_MKEYLEN];
+   sprintf(c_key, "%s%s%s", c_key1, SEP, c_key2);
+   return map_get(p_map, c_key);
+}
+
+
+_Bool
+map_exists(Map *p_map, char *c_key) {
+   if (map_empty(p_map))
+      return false;
+
+   int i_index = map_get_addr(p_map, c_key);
+   return i_index >= 0 ? true : false;
+}
+
+_Bool
+map_exists2(Map *p_map, char *c_key1, char *c_key2) {
+   if (map_empty(p_map))
+      return false;
+
+   char c_key[HASH_MKEYLEN];
+   sprintf(c_key, "%s%s%s:", c_key1, SEP, c_key2);
+
+   int i_index = map_get_addr(p_map, c_key);
+   return i_index >= 0 ? true : false;
+}
+
+char*
+map_get_key(Map *p_map, void *p_val) {
+   if (map_empty(p_map))
+      return NULL;
+
+   for (int i = 0; i < p_map->i_max_size; ++i)
+      if ((unsigned) p_map->pp_vals[i] == (unsigned) p_val)
+         return p_map->pc_keys[i];
+
+   return NULL;
+}
+
+int
+map_get_addr(Map *p_map, char *c_key) {
+   if (map_empty(p_map))
+      return -1;
+
+   for (int i = 0; i < p_map->i_max_size; ++i)
+      if (p_map->pc_keys[i] != NULL && strcmp(p_map->pc_keys[i], c_key) == 0)
+         return i;
+
+   return -1;
+}
+
+void
+map_clear(Map *p_map) {
+   for (int i = 0; i < p_map->i_max_size; ++i)
+      if (p_map->pc_keys[i] != NULL) {
+         free(p_map->pc_keys[i]);
+         p_map->pc_keys[i] = NULL;
+         p_map->pp_vals[i] = NULL;
+      }
+
+   p_map->i_size = 0;
+}
+
+void
+map_clear_and_free_vals(Map *p_map) {
+   for (int i = 0; i < p_map->i_max_size; ++i)
+      if (p_map->pc_keys[i] != NULL) {
+         free(p_map->pc_keys[i]);
+
+         if (p_map->pp_vals[i])
+            free(p_map->pp_vals[i]);
+
+         p_map->pc_keys[i] = NULL;
+         p_map->pp_vals[i] = NULL;
+      }
+
+   p_map->i_size = 0;
+}
+
+void
+map_delete(Map *p_map) {
+   map_clear(p_map);
+   free(p_map);
+}
+
+void
+map_delete_and_free_vals(Map *p_map) {
+   map_clear_and_free_vals(p_map);
+   free(p_map);
+}
+
+void
+map_print(Map *p_map) {
+   printf("Map<size=%d, max_size=%d>:",
+          map_get_size(p_map), map_get_max_size(p_map));
+   for (int i = 0; i < p_map->i_max_size; ++i)
+      if (p_map->pc_keys[i] != NULL)
+         printf("(%d,%s)", i, p_map->pc_keys[i]);
+   puts("");
+}
+
+void
+map_iterate(Map *p_map, void (*func) (void *)) {
+   for (int i = 0; i < p_map->i_max_size; ++i)
+      if (p_map->pc_keys[i] != NULL)
+         (*func) (p_map->pp_vals[i]);
+}
+
+void
+map_iterate_keys(Map *p_map, void (*func) (void *, char *)) {
+   for (int i = 0; i < p_map->i_max_size; ++i)
+      if (p_map->pc_keys[i] != NULL)
+         (*func) (p_map->pp_vals[i], p_map->pc_keys[i]);
+}
+
+void
+map_iterate2(Map *p_map, void (*func) (void *, void *), void *p_void) {
+   for (int i = 0; i < p_map->i_max_size; ++i)
+      if (p_map->pc_keys[i] != NULL)
+         (*func) (p_map->pp_vals[i], p_void);
+}
+
+void
+map_iterate2_keys(Map *p_map, void (*func) (void *, void *, char *), void *p_void) {
+   for (int i = 0; i < p_map->i_max_size; ++i)
+      if (p_map->pc_keys[i] != NULL)
+         (*func) (p_map->pp_vals[i], p_void, p_map->pc_keys[i]);
+}
+
+void
+map_iterate3(Map *p_map, void (*func) (void *, void *, void *), void *p_void1, void *p_void2) {
+   for (int i = 0; i < p_map->i_max_size; ++i)
+      if (p_map->pc_keys[i] != NULL)
+         (*func) (p_map->pp_vals[i], p_void1, p_void2);
+}
+
+void
+map_iterate3_keys(Map *p_map, void (*func) (void *, void *, void *, char *), void *p_void1, void *p_void2) {
+   for (int i = 0; i < p_map->i_max_size; ++i)
+      if (p_map->pc_keys[i] != NULL)
+         (*func) (p_map->pp_vals[i], p_void1, p_void2, p_map->pc_keys[i]);
+}
+
diff --git a/src/data/map.h b/src/data/map.h
new file mode 100644
index 0000000..4ea6184
--- /dev/null
+++ b/src/data/map.h
@@ -0,0 +1,82 @@
+/*:*
+ *: File: ./src/data/map.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 MAP_H
+#define MAP_H
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "../defines.h"
+#define SEP "::"
+
+typedef struct {
+   char *c_name;
+   char **pc_keys;
+   void **pp_vals;
+   int i_size;
+   int i_max_size;
+} Map;
+
+Map *map_new(int i_max_size);
+Map *map_new_named(int i_max_size, char *c_name);
+_Bool map_empty(Map *p_map);
+_Bool map_full(Map *p_map);
+int map_next_free_addr(Map *p_map);
+_Bool map_insert(Map *p_map, char *c_key, void *p_val);
+_Bool map_insert2(Map *p_map, char *c_key1, char *c_key2, void *p_val);
+_Bool map_insert_if_not_exists(Map *p_map, char *c_key, void *p_val);
+void map_remove(Map *p_map, char *c_key);
+void *map_get(Map *p_map, char *c_key);
+void *map_get2(Map *p_map, char *c_key1, char *c_key2);
+_Bool map_exists(Map *p_map, char *c_key);
+_Bool map_exists2(Map *p_map, char *c_key1, char *c_key2);
+char *map_get_key(Map *p_map, void *p_val);
+int map_get_addr(Map *p_map, char *c_key);
+void map_clear(Map *p_map);
+void map_clear_and_free_vals(Map *p_map);
+void map_delete(Map *p_map);
+void map_delete_and_free_vals(Map *p_map);
+void map_print(Map *p_map);
+void map_iterate(Map *p_map, void (*func) (void *));
+void map_iterate_keys(Map *p_map, void (*func) (void *, char *));
+void map_iterate2(Map *p_map, void (*func) (void *, void *), void *p_void);
+void map_iterate2_keys(Map *p_map, void (*func) (void *, void *, char *), void *p_void);
+void map_iterate3(Map *p_map, void (*func) (void *, void *, void *), void *p_void1, void *p_void2);
+void map_iterate3_keys(Map *p_map, void (*func) (void *, void *, void *, char *), void *p_void1, void *p_void2);
+
+#define map_get_size(map) map->i_size
+#define map_get_max_size(map) map->i_max_size
+
+#endif
diff --git a/src/data/queue.c b/src/data/queue.c
new file mode 100644
index 0000000..c9eb29f
--- /dev/null
+++ b/src/data/queue.c
@@ -0,0 +1,210 @@
+/*:*
+ *: File: ./src/data/queue.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 "queue.h"
+
+#include <stdlib.h>
+
+Queue*
+queue_new() {
+   Queue *p_queue = (Queue *) malloc(sizeof(Queue));
+
+   p_queue->p_first = 0;
+   p_queue->p_last = 0;
+   p_queue->i_size = 0;
+
+   return p_queue;
+}
+
+QueueElem*
+queueelem_new() {
+   return queueelem_new_t(TYPE_UNKNOWN);
+}
+
+QueueElem*
+queueelem_new_t(TYPE type) {
+   QueueElem *p_elem = (QueueElem *) malloc(sizeof(QueueElem));
+
+   p_elem->p_next = 0;
+   p_elem->p_val = 0;
+   p_elem->type = type;
+
+   return p_elem;
+}
+
+_Bool
+queue_empty(Queue *p_queue) {
+   if (p_queue == NULL)
+      return 0;
+
+   return p_queue->i_size == 0;
+}
+
+void
+queue_push(Queue *p_queue, void *p_val) {
+   queue_push_t(p_queue, p_val, TYPE_UNKNOWN);
+}
+
+void
+queue_push_t(Queue *p_queue, void *p_val, TYPE type) {
+   QueueElem *p_elem = queueelem_new_t(type);
+   p_elem->p_val = p_val;
+
+   if (0 == p_queue->i_size++)
+      p_queue->p_first = p_elem;
+   else
+      p_queue->p_last->p_next = p_elem;
+
+   p_queue->p_last = p_elem;
+}
+
+void*
+queue_pop(Queue *p_queue) {
+   TYPE type;
+   return queue_pop_t(p_queue, &type);
+}
+
+void*
+queue_pop_t(Queue *p_queue, TYPE *p_type) {
+   if (queue_empty(p_queue))
+      return 0;
+
+   QueueElem *p_elem = p_queue->p_first;
+   p_queue->p_first = p_elem->p_next;
+
+   --p_queue->i_size;
+
+   void *p_ret =  p_elem->p_val;
+   *p_type = p_elem->type;
+   free(p_elem);
+   return p_ret;
+}
+
+void
+queue_clear(Queue *p_queue) {
+   for (;!queue_empty(p_queue); queue_pop(p_queue));
+}
+
+void
+queue_delete(Queue *p_queue) {
+   queue_clear(p_queue);
+   free(p_queue);
+}
+
+unsigned
+queue_size(Queue *p_queue) {
+   return p_queue->i_size;
+}
+
+void
+queue_iterate(Queue *p_queue, void (*func)(void *)) {
+   QueueElem *p_elem = p_queue->p_first;
+   while (p_elem) {
+      if (p_elem->p_val)
+         (*func) (p_elem->p_val);
+
+      p_elem = p_elem->p_next;
+   }
+}
+
+void
+queue_iterate_t(Queue *p_queue, void (*func)(void *, TYPE)) {
+   QueueElem *p_elem = p_queue->p_first;
+   while (p_elem) {
+      if (p_elem->p_val)
+         (*func) (p_elem->p_val, p_elem->type);
+
+      p_elem = p_elem->p_next;
+   }
+}
+
+void
+queue_iterate_tl(Queue *p_queue, void (*func)(void *, TYPE, _Bool)) {
+   QueueElem *p_elem = p_queue->p_first;
+   while (p_elem) {
+      if (p_elem->p_val)
+         (*func) (p_elem->p_val, p_elem->type, p_elem->p_next == NULL);
+
+      p_elem = p_elem->p_next;
+   }
+}
+
+QueueIter*
+queueiter_new(Queue *p_queue) {
+   QueueIter *p_iter =
+      (QueueIter *) malloc(sizeof(QueueIter));
+
+   p_iter->p_current = NULL;
+   p_iter->p_next = p_queue->p_first;
+   p_iter->i_left = queue_size(p_queue);
+   p_iter->p_queue = p_queue;
+
+   return p_iter;
+}
+
+void
+queueiter_delete(QueueIter *p_iter) {
+   free(p_iter);
+}
+
+void*
+queueiter_next(QueueIter *p_iter) {
+   TYPE type;
+   return queueiter_next_t(p_iter, &type);
+}
+
+void*
+queueiter_next_t(QueueIter *p_iter, TYPE *p_type) {
+   if (p_iter->p_next == NULL)
+      return NULL;
+
+   void *p_ret = p_iter->p_next->p_val;
+   *p_type = p_iter->p_next->type;
+   p_iter->p_current = p_iter->p_next;
+   p_iter->p_next = p_iter->p_next->p_next;
+   --p_iter->i_left;
+
+   return p_ret;
+}
+
+unsigned
+queueiter_left(QueueIter *p_iter) {
+   return p_iter->i_left;
+}
+
+Queue*
+queueiter_queue(QueueIter *p_iter) {
+   return p_iter->p_queue;
+}
+
diff --git a/src/data/queue.h b/src/data/queue.h
new file mode 100644
index 0000000..950be07
--- /dev/null
+++ b/src/data/queue.h
@@ -0,0 +1,81 @@
+/*:*
+ *: File: ./src/data/queue.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 QUEUE_H
+#define QUEUE_H
+
+#include "types.h"
+
+typedef struct QueueElem_ {
+   struct QueueElem_ *p_next;
+   void *p_val;
+   TYPE type;
+} QueueElem;
+
+typedef struct {
+   QueueElem *p_first;
+   QueueElem *p_last;
+   unsigned i_size;
+} Queue;
+
+typedef struct {
+   unsigned i_left;
+   Queue *p_queue;
+   QueueElem *p_current;
+   QueueElem *p_next;
+} QueueIter;
+
+Queue *queue_new();
+QueueElem *queueelem_new();
+QueueElem *queueelem_new_t(TYPE type);
+_Bool queue_empty(Queue *p_queue);
+void queue_push(Queue *p_queue, void *p_val);
+void queue_push_t(Queue *p_queue, void *p_val, TYPE type);
+void *queue_pop(Queue *p_queue);
+void *queue_pop_t(Queue *p_queue, TYPE *p_type);
+void queue_clear(Queue *p_queue);
+void queue_delete(Queue *p_queue);
+unsigned queue_size(Queue *p_queue);
+void queue_iterate(Queue *p_queue, void (*func)(void *));
+void queue_iterate_t(Queue *p_queue, void (*func)(void *, TYPE));
+void queue_iterate_tl(Queue *p_queue, void (*func)(void *, TYPE, _Bool));
+
+QueueIter *queueiter_new(Queue *p_queue);
+void queueiter_delete(QueueIter *p_iter);
+void *queueiter_next(QueueIter *p_iter);
+void *queueiter_next_t(QueueIter *p_iter, TYPE *p_type);
+unsigned queueiter_left(QueueIter *p_iter);
+Queue *queueiter_queue(QueueIter *p_iter);
+
+#endif
diff --git a/src/data/stack.c b/src/data/stack.c
new file mode 100644
index 0000000..f0392d0
--- /dev/null
+++ b/src/data/stack.c
@@ -0,0 +1,234 @@
+/*:*
+ *: File: ./src/data/stack.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 "stack.h"
+
+#include "../defines.h"
+
+Stack*
+stack_new() {
+   Stack *p_stack = (Stack *) malloc(sizeof(Stack));
+
+   p_stack->p_first = p_stack->p_last = NULL;
+   p_stack->i_size = 0;
+
+   return (p_stack);
+}
+
+StackElem*
+stackelem_new() {
+   StackElem *p_elem = (StackElem *) malloc(sizeof(StackElem));
+
+   p_elem->p_next = NULL;
+   p_elem->p_val = NULL;
+
+   return (p_elem);
+}
+
+_Bool
+stack_empty(Stack *p_stack) {
+   return (p_stack->i_size == 0);
+}
+
+void
+stack_push(Stack *p_stack, void *p_val) {
+   StackElem *p_elem = stackelem_new();
+
+   p_elem->p_val = p_val;
+   p_elem->p_next = p_stack->p_first;
+   p_stack->p_first = p_elem;
+
+   if (p_stack->p_last == NULL)
+      p_stack->p_last = p_stack->p_first;
+
+   ++p_stack->i_size;
+}
+
+void*
+stack_pop(Stack *p_stack) {
+   if (stack_empty(p_stack))
+      return (NULL);
+
+   StackElem *p_elem = p_stack->p_first;
+   p_stack->p_first = p_elem->p_next;
+
+   void *p_val = p_elem->p_val;
+   free(p_elem);
+   --p_stack->i_size;
+
+   if (p_stack->i_size == 0)
+      p_stack->p_last = NULL;
+
+   return (p_val);
+}
+
+void
+stack_clear(Stack *p_stack) {
+   for (;!stack_empty(p_stack); stack_pop(p_stack));
+}
+
+void
+stack_delete(Stack *p_stack) {
+   stack_clear(p_stack);
+   free(p_stack);
+}
+
+void
+stack_delete_and_free(Stack *p_stack) {
+   for (;!stack_empty(p_stack); free(stack_pop(p_stack)));
+   stack_delete(p_stack);
+}
+
+unsigned
+stack_size(Stack *p_stack) {
+   if (!p_stack)
+      return (0);
+
+   return (p_stack->i_size);
+}
+
+void
+stack_merge(Stack *p_stack, Stack *p_stack_merge) {
+   if (stack_empty(p_stack_merge))
+      return;
+
+   if (stack_empty(p_stack)) {
+      p_stack->p_first = p_stack_merge->p_first;
+      p_stack->p_last = p_stack_merge->p_last;
+      p_stack->i_size = p_stack_merge->i_size;
+
+   } else {
+      StackElem *p_old_first = p_stack->p_first;
+
+      p_stack->p_first = p_stack_merge->p_first;
+      p_stack_merge->p_last->p_next = p_old_first;
+      p_stack->i_size += p_stack_merge->i_size;
+   }
+
+   p_stack_merge->p_first = p_stack_merge->p_last = NULL;
+   p_stack_merge->i_size = 0;
+}
+
+void
+stack_concat(Stack *p_stack, Stack *p_stack_concat) {
+   if (stack_empty(p_stack_concat))
+      return;
+
+   Stack *p_stack_tmp = stack_new();
+
+   StackIterator *p_iter = stackiterator_new(p_stack_concat);
+
+   while (stackiterator_has_next(p_iter))
+      stack_push(p_stack_tmp, stackiterator_next(p_iter));
+
+   stackiterator_delete(p_iter);
+
+   while (!stack_empty(p_stack_tmp))
+      stack_push(p_stack, stack_pop(p_stack_tmp));
+
+   stack_delete(p_stack_tmp);
+}
+
+void
+stack_iterate(Stack *p_stack, void (*func)(void *p_void)) {
+   if (!p_stack)
+      return;
+
+   StackElem *p_elem = p_stack->p_first;
+
+   while (p_elem) {
+      (*func)(p_elem->p_val);
+      p_elem = p_elem->p_next;
+   }
+}
+
+StackIterator*
+stackiterator_new(Stack *p_stack) {
+   StackIterator *p_iter = malloc(sizeof(StackIterator));
+
+   p_iter->p_current = p_stack->p_first;
+   p_iter->p_prev = NULL;
+
+   return (p_iter);
+}
+
+void
+stackiterator_delete(StackIterator *p_iter) {
+   free(p_iter);
+}
+
+void*
+stackiterator_next(StackIterator *p_iter) {
+   if (!p_iter)
+      return (NULL);
+
+   StackElem *p_elem = p_iter->p_current;
+
+   if (!p_elem)
+      return (NULL);
+
+   p_iter->p_prev = p_iter->p_current;
+   p_iter->p_current = p_elem->p_next;
+
+   return (p_elem->p_val);
+}
+
+_Bool
+stackiterator_has_next(StackIterator *p_iter) {
+   return (p_iter->p_current ? true : false);
+}
+
+_Bool
+stackiterator_remove_prev(StackIterator *p_iter) {
+   StackElem *p_prev = p_iter->p_prev;
+
+   if (p_prev == NULL)
+      return (false);
+
+   StackElem *p_next = p_prev->p_next;
+
+   if (p_next == NULL)
+      return (false);
+
+   p_prev->p_val = p_next->p_val;
+   p_prev->p_next = p_next->p_next;
+
+
+   free(p_next);
+
+   p_iter->p_current = p_prev;
+   p_iter->p_prev = NULL;
+
+   return (true);
+}
diff --git a/src/data/stack.h b/src/data/stack.h
new file mode 100644
index 0000000..f5f91c2
--- /dev/null
+++ b/src/data/stack.h
@@ -0,0 +1,76 @@
+/*:*
+ *: File: ./src/data/stack.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 STACK_H
+#define STACK_H
+
+#define stack_top(s) s->p_first->p_val;
+
+#include <stdlib.h>
+
+typedef struct StackElem_ {
+   struct StackElem_ *p_next;
+   void *p_val;
+} StackElem;
+
+typedef struct {
+   StackElem *p_first;
+   StackElem *p_last; // Only needed for stack_merge
+   unsigned i_size;
+} Stack;
+
+typedef struct {
+   StackElem *p_current;
+   StackElem *p_prev;
+} StackIterator;
+
+Stack *stack_new();
+StackElem *stackelem_new();
+_Bool stack_empty(Stack *p_stack);
+void stack_iterate(Stack *p_stack, void (*func)(void *p_void));
+void stack_push(Stack *p_stack, void *p_val);
+void *stack_pop(Stack *p_stack);
+void stack_clear(Stack *p_stack);
+void stack_delete(Stack *p_stack);
+void stack_delete_and_free(Stack *p_stack);
+unsigned stack_size(Stack *p_stack);
+void stack_merge(Stack *p_stack, Stack *p_stack_merge);
+void stack_concat(Stack *p_stack, Stack *p_stack_concat);
+StackIterator* stackiterator_new(Stack *p_stack);
+void stackiterator_delete(StackIterator *p_iter);
+_Bool stackiterator_has_next(StackIterator *p_iter);
+void* stackiterator_next(StackIterator *p_iter);
+_Bool stackiterator_remove_prev(StackIterator *p_iter);
+
+#endif
diff --git a/src/data/tree.c b/src/data/tree.c
new file mode 100644
index 0000000..c1f01c1
--- /dev/null
+++ b/src/data/tree.c
@@ -0,0 +1,250 @@
+/*:*
+ *: File: ./src/data/tree.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 "tree.h"
+
+Tree*
+tree_new() {
+   Tree *p_tree = malloc(sizeof(Tree));
+
+   p_tree->p_treenode_root = NULL;
+
+   return p_tree;
+}
+
+
+void
+tree_delete(Tree *p_tree) {
+   if (!p_tree)
+      return;
+
+   if (p_tree->p_treenode_root)
+      treenode_delete(p_tree->p_treenode_root);
+
+   free(p_tree);
+}
+
+void _tree_print(TreeNode *p_treenode, int i_indent);
+
+void _indent(int i_indent) {
+   for (int i = 0; i < i_indent; ++i)
+      if (i % TREE_PRINT_INDENT)
+         printf(" ");
+      else
+         printf("|");
+}
+
+void
+_tree_print_cb2(void *p_void, void *p_indent) {
+   _tree_print(p_void, (int) p_indent);
+}
+
+void
+_tree_print_cb(void *p_void, void *p_indent) {
+   TreeNode *ptn = p_void;
+   _indent((int) p_indent);
+
+#ifdef FYPE
+   TokenType tt = (TokenType) treenode_get_val(ptn);
+
+   if (IS_NOT_TERMINAL(tt))
+      goto no_token_val;
+
+   Token *p_token = treenode_get_val2(ptn);
+
+   if (!p_token)
+      goto no_token_val;
+
+   char *c_token_val = token_get_val(p_token);
+   TokenType tt_token = token_get_tt(p_token);
+
+   if (!c_token_val)
+      c_token_val = "";
+
+   printf(" %s=%s", tt_get_name(tt_token), c_token_val);
+   return;
+
+no_token_val:
+   printf(" %s", tt_get_name(tt));
+
+#else
+   printf(" %d", (int) treenode_get_val(ptn));
+#endif
+}
+
+void
+_tree_print(TreeNode *p_treenode, int i_indent) {
+   TokenType tt = (TokenType)treenode_get_val(p_treenode);
+
+#ifdef FYPE
+   _Bool b_print_nl = false;
+   if (IS_NOT_TERMINAL(tt)) {
+      _indent(i_indent);
+      printf("%s:", tt_get_name(tt));
+      b_print_nl = true;
+   }
+#else
+   _indent(i_indent);
+   printf("%s:", tt_get_name(tt));
+#endif
+
+   array_iterate2(p_treenode->p_array_childs, _tree_print_cb, (void*) 0);
+
+#ifdef FYPE
+   if (b_print_nl)
+#endif
+      printf("\nTree ");
+
+   array_iterate2(p_treenode->p_array_childs, _tree_print_cb2, (void*) (i_indent + TREE_PRINT_INDENT));
+}
+
+void
+tree_print(Tree *p_tree) {
+   if (!p_tree)
+      return;
+
+   printf("\nTree ");
+   _tree_print(tree_get_root(p_tree), 0);
+   printf("\n");
+}
+
+TreeNode*
+treenode_new(void *p_val) {
+   return treenode_new2(p_val, NULL);
+}
+
+TreeNode*
+treenode_new2(void *p_val, void *p_val2) {
+   TreeNode *p_treenode = malloc(sizeof(TreeNode));
+
+   p_treenode->tnt = IS_LEAF;
+   p_treenode->p_array_childs = array_new();
+   p_treenode->p_val = p_val;
+   p_treenode->p_val2 = p_val2;
+
+   return p_treenode;
+}
+
+void
+treenode_delete(TreeNode *p_treenode) {
+   if (!p_treenode)
+      return;
+
+   int i_size = array_get_size(p_treenode->p_array_childs);
+
+   for (int i = 0; i < i_size; ++i)
+      treenode_delete(array_get(p_treenode->p_array_childs, i));
+
+   array_delete(p_treenode->p_array_childs);
+
+   free(p_treenode);
+}
+
+void
+treenode_insert_left(TreeNode *p_treenode, TreeNode *p_treenode2) {
+   array_unshift(p_treenode->p_array_childs, p_treenode2);
+}
+
+void
+treenode_insert_right(TreeNode *p_treenode, TreeNode *p_treenode2) {
+   array_push(p_treenode->p_array_childs, p_treenode2);
+}
+
+TreeIteratorState*
+treeiteratorstate_new(TreeNode *ptn) {
+   TreeIteratorState *p_state = malloc(sizeof(TreeIteratorState));
+
+   p_state->ptn = ptn;
+   p_state->i_pos = 0;
+
+   return p_state;
+}
+
+void
+treeiteratorstate_delete(TreeIteratorState *p_state) {
+   free(p_state);
+}
+
+TreeIterator*
+treeiterator_new(Tree *p_tree) {
+   TreeIterator *p_iter = malloc(sizeof(TreeIterator));
+
+   p_iter->p_stack = stack_new();
+   p_iter->p_state = treeiteratorstate_new(tree_get_root(p_tree));
+
+   return p_iter;
+}
+
+void
+treeiterator_delete(TreeIterator *p_iter) {
+   while (!stack_empty(p_iter->p_stack))
+      treeiteratorstate_delete(stack_pop(p_iter->p_stack));
+
+   stack_delete(p_iter->p_stack);
+
+   if (p_iter->p_state)
+      treeiteratorstate_delete(p_iter->p_state);
+}
+
+_Bool
+treeiterator_has_next(TreeIterator *p_iter) {
+   return p_iter->p_state != NULL;
+}
+
+TreeNode*
+treeiterator_next(TreeIterator *p_iter) {
+   if (!treeiterator_has_next(p_iter))
+      return NULL;
+
+   TreeNode *ptn = p_iter->p_state->ptn;
+
+   Array *p_array_childs = treenode_get_childs(ptn);
+   int i_num_childs = array_get_size(p_array_childs);
+
+   if (p_iter->p_state->i_pos >= i_num_childs) {
+      treeiteratorstate_delete(p_iter->p_state);
+
+      p_iter->p_state =
+         stack_empty(p_iter->p_stack) ? NULL : stack_pop(p_iter->p_stack);
+
+      return ptn;
+   }
+
+   TreeNode *ptn_next = array_get(p_array_childs, p_iter->p_state->i_pos++);
+   stack_push(p_iter->p_stack, p_iter->p_state);
+   p_iter->p_state = treeiteratorstate_new(ptn_next);
+
+   return ptn;
+}
+
diff --git a/src/data/tree.h b/src/data/tree.h
new file mode 100644
index 0000000..9b98d86
--- /dev/null
+++ b/src/data/tree.h
@@ -0,0 +1,106 @@
+/*:*
+ *: File: ./src/data/tree.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 TREE_H
+#define TREE_H
+
+#include "../defines.h"
+#include "array.h"
+#include "stack.h"
+
+#ifdef FYPE
+#include "../core/token.h"
+#endif
+
+#define TREE_PRINT_INDENT 3
+
+#define tree_get_root(t) t->p_treenode_root
+#define tree_set_root(t,tn) t->p_treenode_root = tn
+#define treenode_get_num_childs(tn) array_get_size(tn->p_array_childs)
+#define treenode_get_tnt(tn) tn->tnt
+#define treenode_get_val(tn) tn->p_val
+#define treenode_get_val2(tn) tn->p_val2
+#define treenode_set_tnt(tn,t) tn->tnt = t
+#define treenode_set_val(tn,v) tn->p_val = v
+#define treenode_set_val2(tn,v) tn->p_val2 = v
+#define treenode_insert_child treenode_insert_right
+#define treenode_get_childs(tn) tn->p_array_childs
+#define treenode_get_child(tn,i) array_get(tn->p_array_childs,i)
+#define treenode_get_first_child(tn) array_get_first(tn->p_array_childs)
+#define treenode_get_last_child(tn) array_get_last(tn->p_array_childs)
+
+typedef enum {
+   IS_NOTLEAF,
+   IS_LEAF,
+} TreeNodeType;
+
+typedef struct {
+   TreeNodeType tnt;
+   Array *p_array_childs;
+   void *p_val;
+   void *p_val2;
+} TreeNode;
+
+typedef struct {
+   TreeNode *p_treenode_root;
+} Tree;
+
+typedef struct {
+   TreeNode *ptn;
+   int i_pos;
+} TreeIteratorState;
+
+typedef struct {
+   Stack *p_stack;
+   TreeIteratorState *p_state;
+} TreeIterator;
+
+Tree* tree_new();
+void tree_delete(Tree *p_tree);
+void tree_print(Tree *p_tree);
+TreeNode* treenode_new(void *p_val);
+TreeNode* treenode_new2(void *p_val, void *p_val2);
+void treenode_delete(TreeNode *p_treenode);
+void treenode_insert_left(TreeNode *p_treenode, TreeNode *p_treenode2);
+void treenode_insert_right(TreeNode *p_treenode, TreeNode *p_treenode2);
+
+TreeIteratorState* treeiteratorstate_new(TreeNode *ptn);
+void treeiteratorstate_delete(TreeIteratorState *p_state);
+
+TreeIterator* treeiterator_new(Tree *p_tree);
+void treeiterator_delete(TreeIterator *p_iter);
+_Bool treeiterator_has_next(TreeIterator *p_iter);
+TreeNode* treeiterator_next(TreeIterator *p_iter);
+
+#endif
diff --git a/src/data/tupel.c b/src/data/tupel.c
new file mode 100644
index 0000000..c5ec5a4
--- /dev/null
+++ b/src/data/tupel.c
@@ -0,0 +1,53 @@
+/*:*
+ *: File: ./src/data/tupel.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 "tupel.h"
+
+#include <stdlib.h>
+
+Tupel*
+tupel_new() {
+   Tupel *p_tupel = (Tupel *) malloc(sizeof(Tupel));
+
+   p_tupel->a = NULL;
+   p_tupel->b = NULL;
+   p_tupel->c = NULL;
+
+   return p_tupel;
+}
+
+void
+tupel_delete(Tupel *p_tupel) {
+   free(p_tupel);
+}
diff --git a/src/data/tupel.h b/src/data/tupel.h
new file mode 100644
index 0000000..ae5bdcc
--- /dev/null
+++ b/src/data/tupel.h
@@ -0,0 +1,47 @@
+/*:*
+ *: File: ./src/data/tupel.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 TUPEL_H
+#define TUPEL_H
+
+typedef struct {
+   void *a;
+   void *b;
+   void *c;
+} Tupel;
+
+Tupel *tupel_new();
+void tupel_delete(Tupel *p_tupel);
+
+#endif
diff --git a/src/data/types.h b/src/data/types.h
new file mode 100644
index 0000000..f47f258
--- /dev/null
+++ b/src/data/types.h
@@ -0,0 +1,64 @@
+/*:*
+ *: File: ./src/data/types.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 TYPES_H
+#define TYPES_H
+
+typedef enum {
+   TYPE_UNKNOWN,
+   TYPE_NUMBER,
+   TYPE_STRING,
+   TYPE_VOIDP,
+   TYPE_SYMVAR,
+   TYPE_VARIABLE,
+   TYPE_REGEXPR,
+   TYPE_OPERATOR,
+   TYPE_STACK,
+   TYPE_TUPEL,
+   TYPE_HASH,
+   TYPE_DAT,
+   TYPE_ARG_DAT,
+   TYPE_ARGS_DAT,
+   TYPE_STATEMENT_DAT,
+   TYPE_CODE_DAT
+} TYPE;
+
+typedef enum {
+   RET_OK,
+   RET_ERROR = -1,
+   RET_NO_SPACE = -2,
+   RET_OCCUPIED = -3
+} RETCODE;
+
+#endif