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diff --git a/src/utility/context.h b/src/utility/context.h
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+++ b/src/utility/context.h
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+/*
+ * Copyright (c) 2003-2007, 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.
+ */
+
+#ifndef _CONTEXT_H
+#define _CONTEXT_H
+
+namespace ledger {
+
+class context
+{
+public:
+  string description;	   // ex: 'While parsing file "%R" at line %L'
+
+  explicit context(const string& _description) throw()
+    : description(_description) {}
+
+  virtual ~context() {}
+};
+
+class file_context : public context
+{
+public:
+  path pathname;		// ex: ledger.dat
+
+  uint_least32_t linenum_beg;	// ex: 1010
+  uint_least32_t linenum_end;	// ex: 1010
+  uint_least32_t position_beg;
+  uint_least32_t position_end;
+
+  optional<uint_least32_t> colnum_beg;	// ex: 8
+  optional<uint_least32_t> colnum_end;	// ex: 8
+
+  explicit file_context(const path&          _pathname,
+			const uint_least32_t _linenum_beg,
+			const uint_least32_t _linenum_end,
+			const uint_least32_t _position_beg,
+			const uint_least32_t _position_end) throw()
+    : context(""),
+      pathname(_pathname),
+      linenum_beg(_linenum_beg),
+      linenum_end(_linenum_end),
+      position_beg(_position_beg),
+      position_end(_position_end) {}
+};
+
+class string_context : public context
+{
+public:
+  string text;			// ex: (The multi-line text of an entry)
+
+  optional<uint_least32_t> linenum_beg_off; // ex: 2
+  optional<uint_least32_t> linenum_end_off; // ex: 2
+  optional<uint_least32_t> colnum_beg_off; // ex: 8
+  optional<uint_least32_t> colnum_end_off; // ex: 8
+};
+
+#if 0
+
+class file_context : public error_context
+{
+ protected:
+  string   file;
+  unsigned long line;
+ public:
+  file_context(const string& _file, unsigned long _line,
+	       const string& _desc = "") throw()
+    : error_context(_desc), file(_file), line(_line) {}
+  virtual ~file_context() throw() {}
+
+  virtual void describe(std::ostream& out) const throw() {
+    if (! desc.empty())
+      out << desc << " ";
+
+    out << "\"" << file << "\", line " << line << ": ";
+  }
+};
+
+class line_context : public error_context {
+ public:
+  string line;
+  long	      pos;
+
+  line_context(const string& _line, long _pos,
+	       const string& _desc = "") throw()
+    : error_context(_desc), line(_line), pos(_pos) {}
+  virtual ~line_context() throw() {}
+
+  virtual void describe(std::ostream& out) const throw() {
+    if (! desc.empty())
+      out << desc << std::endl;
+
+    out << "  " << line << std::endl << "  ";
+    long idx = pos < 0 ? line.length() - 1 : pos;
+    for (int i = 0; i < idx; i++)
+      out << " ";
+    out << "^" << std::endl;
+  }
+};
+
+#endif
+
+extern ptr_list<context> context_stack;
+
+#define PUSH_CONTEXT() try {
+#define POP_CONTEXT(ctxt)			\
+  } catch (...) {				\
+    context_stack.push_front(new ctxt);		\
+    throw;					\
+  }
+
+} // namespace ledger
+
+#endif // _CONTEXT_H