1 files changed, 127 insertions, 0 deletions
diff --git a/src/hyper/item.c b/src/hyper/item.c
new file mode 100644
index 00000000..18311ec8
--- /dev/null
+++ b/src/hyper/item.c
@@ -0,0 +1,127 @@
+/*
+  Copyright (C) 1991-2002, The Numerical Algorithms Group Ltd.
+  All rights reserved.
+  Copyright (C) 2007-2008, Gabriel Dos Reis.
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, 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 The Numerical Algorithms Group Ltd. 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER
+  OR CONTRIBUTORS 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 "axiom-c-macros.h"
+#include "useproto.h"
+#define _ITEM_C
+#include "debug.h"
+#include "extent.h"
+
+#include "all_hyper_proto.H1"
+
+/*
+ * Here are structures needed for manipulating the item stack
+ */
+ItemStack *gTopOfItemStack = NULL;
+
+
+void
+push_item_stack(void)
+{
+    ItemStack *is = (ItemStack *) halloc(sizeof(ItemStack), "Item stack");
+
+    is->indent = indent;
+    is->item_indent = item_indent;
+    is->next = gTopOfItemStack;
+    is->in_item = gInItem;
+    gTopOfItemStack = is;
+    return;
+}
+void
+clear_item_stack(void)
+{
+    ItemStack *is = gTopOfItemStack, *chuck;
+
+    while (is != NULL) {
+        chuck = is;
+        is = is->next;
+        free(chuck);
+    }
+    return;
+}
+void
+pop_item_stack(void)
+{
+    ItemStack *chuck;
+
+    if (gTopOfItemStack == NULL) {
+        fprintf(stderr, "Tried to pop an empty item stack\n");
+        return;
+    }
+    chuck = gTopOfItemStack;
+    gTopOfItemStack = gTopOfItemStack->next;
+    indent = chuck->indent;
+    item_indent = chuck->item_indent;
+    gInItem = chuck->in_item;
+    free(chuck);
+}
+
+ItemStack *
+copy_item_stack(void)
+{
+    ItemStack *new = NULL;
+    ItemStack *prev = NULL;
+    ItemStack *trace = gTopOfItemStack;
+    ItemStack *first = NULL;
+
+    while (trace) {
+        new = (ItemStack *) halloc(sizeof(ItemStack), "Item stack");
+        new->indent = trace->indent;
+        new->item_indent = trace->item_indent;
+        new->in_item = gInItem;
+        if (!first)
+            first = new;
+        else
+            prev->next = new;
+        prev = new;
+        trace = trace->next;
+    }
+    if (new)
+        new->next = NULL;
+    return first;
+}
+
+void
+free_item_stack(ItemStack *is)
+{
+    ItemStack *junk = NULL;
+    ItemStack *trace = is;
+
+    while (trace) {
+        junk = trace;
+        trace = trace->next;
+        free(junk);
+    }
+}