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+/*
+ * Copyright (c) 2003-2009, John Wiegley.  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 New Artisans LLC 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.
+ */
+
+/**
+ * @addtogroup expr
+ */
+
+/**
+ * @file   parser.h
+ * @author John Wiegley
+ *
+ * @ingroup expr
+ */
+#ifndef _PARSER_H
+#define _PARSER_H
+
+#include "token.h"
+#include "op.h"
+
+namespace ledger {
+
+class expr_t::parser_t : public noncopyable
+{
+  mutable token_t lookahead;
+  mutable bool	  use_lookahead;
+
+  token_t& next_token(std::istream& in, const parse_flags_t& tflags) const {
+    if (use_lookahead)
+      use_lookahead = false;
+    else
+      lookahead.next(in, tflags);
+    return lookahead;
+  }
+
+  void push_token(const token_t& tok) const {
+    assert(&tok == &lookahead);
+    use_lookahead = true;
+  }
+  void push_token() const {
+    use_lookahead = true;
+  }
+
+  ptr_op_t parse_value_term(std::istream& in,
+			    const parse_flags_t& flags) const;
+  ptr_op_t parse_dot_expr(std::istream& in,
+			  const parse_flags_t& flags) const;
+  ptr_op_t parse_unary_expr(std::istream& in,
+			    const parse_flags_t& flags) const;
+  ptr_op_t parse_mul_expr(std::istream& in,
+			  const parse_flags_t& flags) const;
+  ptr_op_t parse_add_expr(std::istream& in,
+			  const parse_flags_t& flags) const;
+  ptr_op_t parse_logic_expr(std::istream& in,
+			    const parse_flags_t& flags) const;
+  ptr_op_t parse_and_expr(std::istream& in,
+			  const parse_flags_t& flags) const;
+  ptr_op_t parse_or_expr(std::istream& in,
+			 const parse_flags_t& flags) const;
+  ptr_op_t parse_querycolon_expr(std::istream& in,
+				 const parse_flags_t& flags) const;
+  ptr_op_t parse_value_expr(std::istream& in,
+			    const parse_flags_t& flags) const;
+
+public:
+  parser_t() : use_lookahead(false) {
+    TRACE_CTOR(parser_t, "");
+  }
+  ~parser_t() throw() {
+    TRACE_DTOR(parser_t);
+  }
+
+  ptr_op_t parse(std::istream&		 in,
+		 const parse_flags_t&	 flags		 = PARSE_DEFAULT,
+		 const optional<string>& original_string = NULL);
+};
+
+} // namespace ledger
+
+#endif // _PARSER_H