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// file : build2/prerequisite -*- C++ -*-
// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef BUILD2_PREREQUISITE
#define BUILD2_PREREQUISITE
#include <unordered_set>
#include <build2/types>
#include <build2/utility>
#include <build2/target-key>
#include <build2/diagnostics>
namespace build2
{
class scope;
class target;
// Light-weight (by being shallow-pointing) prerequisite key, similar
// to (and based on) target key.
//
// Note that unlike prerequisite, the key is not (necessarily) owned by a
// target. So for the key we instead have the base scope of the target that
// (would) own it. Note that we assume keys to be ephemeral enough for the
// base scope to remain unchanged.
//
class prerequisite_key
{
public:
typedef build2::scope scope_type;
const optional<string>& proj;
target_key tk; // The .dir and .out members can be relative.
scope_type* scope; // Can be NULL if tk.dir is absolute.
static const optional<string> nullproj;
template <typename T>
bool is_a () const {return tk.is_a<T> ();}
bool is_a (const target_type& tt) const {return tk.is_a (tt);}
};
ostream&
operator<< (ostream&, const prerequisite_key&);
class prerequisite
{
public:
typedef build2::target target_type;
typedef build2::target_type target_type_type;
// Note that unlike targets, for prerequisites an empty out directory
// means undetermined rather than being definitely in the out tree.
//
const optional<string> proj;
const target_type_type& type;
const dir_path dir; // Normalized absolute or relative (to scope).
const dir_path out; // Empty, normalized absolute, or relative.
const string name;
const optional<string> ext; // Absent if unspecified.
target_type& owner; // Target to which this prerequisite belongs.
target_type* target; // NULL if not yet resolved. Note that this
// should always be the "primary target", not
// a member of a target group.
public:
prerequisite (optional<string> p,
const target_type_type& t,
dir_path d,
dir_path o,
string n,
optional<string> e,
target_type& w)
: proj (move (p)),
type (t),
dir (move (d)),
out (move (o)),
name (move (n)),
ext (move (e)),
owner (w),
target (nullptr) {}
// Make a copy for a new owner target. Note that both owner targets should
// be in the same scope.
//
prerequisite (const prerequisite&, target_type& owner);
// Make a prerequisite from a target.
//
prerequisite (target_type&, target_type& owner);
prerequisite (const prerequisite&) = delete;
prerequisite (prerequisite&&) = default;
prerequisite& operator= (const prerequisite&) = delete;
prerequisite& operator= (prerequisite&&) = default;
// Note that the returned key "tracks" the prerequisite; that is, any
// updates to the prerequisite's members will be reflected in the key.
//
prerequisite_key
key () const;
// Prerequisite (target) type.
//
public:
template <typename T>
bool
is_a () const {return type.is_a<T> ();}
bool
is_a (const target_type_type& tt) const {return type.is_a (tt);}
};
inline ostream&
operator<< (ostream& os, const prerequisite& p)
{
return os << p.key ();
}
}
#endif // BUILD2_PREREQUISITE
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