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+// -*- C++ -*-
+// Copyright (C) 2013, Gabriel Dos Reis.
+// All rights reserved.
+// Written by Gabriel Dos Reis.
+//
+// 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 OpenAxiom, 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 OPENAXIOM_INPUT_included
+#define OPENAXIOM_INPUT_included
+
+#include <iterator>
+#include <string>
+#include <vector>
+#include "open-axiom.h"
+#include <open-axiom/structure>
+#include <open-axiom/iterator>
+
+namespace OpenAxiom {
+   namespace Input {
+      // -- Input text data
+      using Text = std::string;
+
+      // -- Type of Thingies that iterate over text values
+      using TextIterator = Text::const_iterator;
+
+      // -- Position of an input source line.
+      using LineNumber = Ordinal;
+      
+      // -- We keep info only for non-empty input lines.
+      struct NonEmptyLine : private structure::binary<LineNumber, Text> {
+         NonEmptyLine(LineNumber, const Text&);
+         LineNumber number() const { return first(); }
+         const Text& text() const { return second(); }
+         TextIterator begin() const { return text().begin(); }
+         TextIterator end() const { return text().end(); }
+         std::size_t size() const { return text().size(); }
+      };
+
+      struct Source;
+      // -- Index into input source lines --
+      using Index = std::size_t;
+
+      // -- Line --
+      struct Line : private structure::binary<const Source*, Index> {
+         using value_type = Text::value_type;
+         using const_reference = Text::const_reference;
+         using const_pointer = Text::const_pointer;
+         using difference_type = Text::difference_type;
+         using iterator = iterator::basic<Line>;
+         const NonEmptyLine& get() const;
+         const Text& text() const { return get().text(); }
+         LineNumber number() const { return get().number(); }
+         iterator begin() const { return { this, 0 }; }
+         iterator end() const { return { this, size() }; }
+         Cardinal size() const { return text().size(); }
+         const_reference at(Ordinal n) const { return text().at(n); }
+      private:
+         constexpr Line(const Source* s, Index i)
+               : structure::binary<const Source*, Index>(s, i)
+         { }
+         const Source* source() const { return first(); }
+         Index index() const { return second(); }
+         
+         friend Source;
+      };
+
+      // -- LineIterator --
+      using LineIterator = Line::iterator;
+
+      // -- Source --
+      struct Source : std::vector<NonEmptyLine> {
+         using iterator = OpenAxiom::iterator::basic<Source>;
+         using Index = Ordinal; // line index
+         Line line(Index i) const { return { this, i }; }
+         iterator begin() const { return { this, 0 }; }
+         iterator end() const { return { this, size() }; }
+         Line line(LineNumber, const Text&);
+      };
+   }
+}
+
+#endif  // OPENAXIOM_INPUT_included