// file      : build2/target-key -*- C++ -*-
// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
// license   : MIT; see accompanying LICENSE file

#ifndef BUILD2_TARGET_KEY
#define BUILD2_TARGET_KEY

#include <map>

#include <butl/utility> // compare_c_string

#include <build2/types>
#include <build2/utility>

#include <build2/target-type>

namespace build2
{
  // Light-weight (by being shallow-pointing) target key.
  //
  class target_key
  {
  public:
    const target_type* const  type;
    const dir_path* const dir; // Can be relative if part of prerequisite_key.
    const dir_path* const out; // Can be relative if part of prerequisite_key.
    const string* const  name;
    const string* const& ext;

    friend bool
    operator< (const target_key& x, const target_key& y)
    {
      const target_type* xt (x.type);
      const target_type* yt (y.type);

      int t, n, d, o;

      // Unspecified and specified extension are assumed equal. The
      // extension strings are from the pool, so we can just compare
      // pointers.
      //
      return
        ((t = xt < yt ? -1 : xt > yt ? 1 : 0) < 0) ||
        (t == 0 && (n = x.name->compare (*y.name)) < 0) ||
        (t == 0 &&  n == 0 && (d = x.dir->compare (*y.dir)) < 0) ||
        (t == 0 &&  n == 0 &&  d == 0 && (o = x.out->compare (*y.out)) < 0) ||
        (t == 0 &&  n == 0 &&  d == 0 &&  o == 0 &&
         x.ext != nullptr && y.ext != nullptr && *x.ext < *y.ext);
    }
  };

  // If the target type has a custom print function, call that. Otherwise,
  // call to_stream() with the current stream verbosity as a third argument.
  // Both are defined in target.cxx.
  //
  ostream&
  operator<< (ostream&, const target_key&);

  ostream&
  to_stream (ostream&, const target_key&, uint16_t ext_verb);
}

#endif // BUILD2_TARGET_KEY