1 files changed, 58 insertions, 0 deletions
diff --git a/src/node.h b/src/node.h
new file mode 100644
index 0000000..5b43f8f
--- /dev/null
+++ b/src/node.h
@@ -0,0 +1,58 @@
+/***********************************************************
+Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The
+Netherlands.
+
+ All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the names of Stichting Mathematisch
+Centrum or CWI not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior permission.
+
+STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
+THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
+FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+******************************************************************/
+
+/* Parse tree node interface */
+
+typedef struct _node {
+ int n_type;
+ char *n_str;
+ int n_lineno;
+ int n_nchildren;
+ struct _node *n_child;
+} node;
+
+extern node *newtree PROTO((int type));
+extern node *addchild PROTO((node *n, int type, char *str, int lineno));
+extern void freetree PROTO((node *n));
+
+/* Node access functions */
+#define NCH(n) ((n)->n_nchildren)
+#define CHILD(n, i) (&(n)->n_child[i])
+#define TYPE(n) ((n)->n_type)
+#define STR(n) ((n)->n_str)
+
+/* Assert that the type of a node is what we expect */
+#ifndef DEBUG
+#define REQ(n, type) { /*pass*/ ; }
+#else
+#define REQ(n, type) \
+ { if (TYPE(n) != (type)) { \
+ fprintf(stderr, "FATAL: node type %d, required %d\n", \
+ TYPE(n), type); \
+ abort(); \
+ } }
+#endif
+
+extern void listtree PROTO((node *));
+extern void listnode PROTO((FILE *, node *));