1 files changed, 79 insertions, 0 deletions

diff --git a/src/ops/express.h b/src/ops/express.h
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+++ b/src/ops/express.h
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+/*************************************************************************
+ *
+ * HTCd - Copyright (C) 1998-2006 Henrik Rydberg
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef EXPRESSH
+#define EXPRESSH
+
+#include <ops/operator.h>
+#include <mt/split.h>
+#include <mt/uniheap.h>
+
+const int OP_LOCAL=1;
+const int OP_GLOBAL=2;
+const int OP_NINIT=4;
+const int OP_ALL=OP_LOCAL|OP_GLOBAL|OP_NINIT;
+
+class expr_t {
+public:
+  sref expr;
+  const op_t* op;
+  int status;
+  mstring result;  
+  expr_t *left,*right;
+  
+  expr_t():
+    expr(),op(0),status(OP_ALL),result(),left(0),right(0) {}
+  expr_t(const expr_t& x):
+    expr(),op(0),status(OP_ALL),result(),left(0),right(0) { copy(x); }
+  expr_t(const sref& s):
+    expr(s),op(0),status(OP_ALL),result(),left(0),right(0) {}
+  expr_t(const sref& s,const op_t* o):
+    expr(s),op(o),status(OP_ALL),result(),left(0),right(0) {}
+  expr_t(const sref& s,const op_t* o,expr_t* p):
+    expr(s),op(o),status(OP_ALL),result(),left(p),right(0) {}
+  ~expr_t() { delete left; delete right; }
+  
+  void clear();
+  expr_t& operator=(const expr_t& x) { clear(); copy(x); return *this; }
+  expr_t& operator=(const sref& in) { clear(); expr=in; return *this; }
+  
+  void trav(mstream& out,int n);
+  void expand(op_env& env) throw(merror_t);
+  void eval(mstream& out,op_env& env,int opt) throw(merror_t);
+  
+  static void* operator new(size_t n);
+  static void operator delete(void* p);
+protected:
+  void copy(const expr_t& x);
+  static uniheap<36> tree;
+};
+
+////////////////////////////////////////////////////////////
+
+struct op_env {
+  opmap* ops;
+
+  op_env() : ops(0) {}
+  op_env(opmap& map) : ops(&map) {}
+
+  virtual int split(sref& first,sref& rest) throw(merror_t) { return 0; }
+  virtual void term(mstream& out,expr_t* x) throw(merror_t) { x->status=0; }
+};
+
+#endif