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// file : build/target -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
// license : MIT; see accompanying LICENSE file
#ifndef BUILD_TARGET
#define BUILD_TARGET
#include <string>
#include <vector>
#include <functional> // function, reference_wrapper
#include <typeindex>
#include <iosfwd>
#include <cassert>
#include <build/path>
#include <build/timestamp>
namespace build
{
class target;
enum class target_state {unknown, uptodate, updated, failed};
typedef std::function<target_state (target&)> recipe;
typedef std::vector<std::reference_wrapper<target>> targets;
class target
{
public:
target (std::string n): name_ (n) {}
const std::string&
name () const {return name_;}
const targets&
prerequisites () const {return prerequisites_;}
targets&
prerequisites () {return prerequisites_;}
void
prerequisite (target& t) {prerequisites_.push_back (t);}
public:
typedef build::recipe recipe_type;
const recipe_type&
recipe () const {return recipe_;}
void
recipe (recipe_type r) {assert (!recipe_); recipe_ = r;}
public:
target_state
state () const {return state_;}
void
state (target_state s) {state_ = s;}
private:
target (const target&) = delete;
target& operator= (const target&) = delete;
public:
struct type_info
{
std::type_index id;
const char* name;
const type_info* base;
};
virtual const type_info&
type_id () const = 0;
protected:
static const type_info ti_;
private:
std::string name_;
targets prerequisites_;
recipe_type recipe_;
target_state state_ {target_state::unknown};
};
std::ostream&
operator<< (std::ostream&, const target&);
// Modification time-based target.
//
class mtime_target: public target
{
public:
using target::target;
timestamp
mtime () const
{
if (mtime_ == timestamp_unknown)
mtime_ = load_mtime ();
return mtime_;
}
void
mtime (timestamp mt) {mtime_ = mt;}
protected:
virtual timestamp
load_mtime () const = 0;
protected: static const type_info ti_;
private:
mutable timestamp mtime_ {timestamp_unknown};
};
// Filesystem path-bases target.
//
class path_target: public mtime_target
{
public:
using mtime_target::mtime_target;
typedef build::path path_type;
const path_type&
path () const {return path_;}
void
path (path_type p) {assert (path_.empty ()); path_ = p;}
protected:
virtual timestamp
load_mtime () const;
protected: static const type_info ti_;
private:
path_type path_;
};
// File target.
//
class file: public path_target
{
public:
using path_target::path_target;
public: virtual const type_info& type_id () const {return ti_;}
protected: static const type_info ti_;
};
}
#endif // BUILD_TARGET
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