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authorEelco Dolstra <e.dolstra@tudelft.nl>2003-11-18T10·47+0000
committerEelco Dolstra <e.dolstra@tudelft.nl>2003-11-18T10·47+0000
commit8798fae30450a88c339c8f23d7e0c75f5df2ef1c (patch)
tree53d271e89ee3d04490a94a7ea82cf2dc3bbc3c30 /src/libutil/aterm.hh
parent45610ae675f6f8d6ecbd48c495cb7012b143d531 (diff)
* Source tree refactoring.
Diffstat (limited to 'src/libutil/aterm.hh')
-rw-r--r--src/libutil/aterm.hh77
1 files changed, 77 insertions, 0 deletions
diff --git a/src/libutil/aterm.hh b/src/libutil/aterm.hh
new file mode 100644
index 000000000000..16d8d6bb6dfd
--- /dev/null
+++ b/src/libutil/aterm.hh
@@ -0,0 +1,77 @@
+#ifndef __ATERM_H
+#define __ATERM_H
+
+extern "C" {
+#include <aterm2.h>
+}
+
+#include "util.hh"
+
+
+/* Print an ATerm. */
+string atPrint(ATerm t);
+
+/* Write an ATerm to an output stream. */
+ostream & operator << (ostream & stream, ATerm e);
+
+class ATermIterator
+{
+    ATermList t;
+
+public:
+    ATermIterator(ATermList _t) : t(_t) { }
+    ATermIterator & operator ++ ()
+    {
+        t = ATgetNext(t);
+        return *this;
+    }
+    ATerm operator * ()
+    {
+        return ATgetFirst(t);
+    }
+    operator bool ()
+    {
+        return t != ATempty;
+    }
+};
+
+
+/* Type-safe matching. */
+
+struct ATMatcher 
+{
+    ATerm t;
+    int pos;
+    const static int failPos = -2;
+    const static int funPos = -1;
+
+    ATMatcher() : t(0), pos(failPos)
+    {
+    }
+
+    operator bool() const
+    {
+        return pos != failPos;
+    }
+};
+
+/* Initiate matching of a term. */
+ATMatcher & atMatch(ATMatcher & pos, ATerm t);
+
+/* Get the next argument of an application. */
+ATMatcher & operator >> (ATMatcher & pos, ATerm & out);
+
+/* Get the name of the function symbol of an applicatin, or the next
+   argument of an application as a string. */
+ATMatcher & operator >> (ATMatcher & pos, string & out);
+
+/* Like the previous, but check that the string is equal to the given
+   string. */
+ATMatcher & operator >> (ATMatcher & pos, const string & s);
+
+/* Get the next argument of an application, and verify that it is a
+   list. */
+ATMatcher & operator >> (ATMatcher & pos, ATermList & out);
+
+
+#endif /* !__ATERM_H */