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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 <set>
#include <map>
#include <string>
#include <vector>
#include <memory> // unique_ptr
#include <functional> // function, reference_wrapper
#include <typeindex>
#include <iosfwd>
#include <cassert>
#include <utility> // move
#include <build/path>
#include <build/timestamp>
#include <build/prerequisite>
#include <build/utility> // compare_*, extension_pool
namespace build
{
class target;
enum class target_state {unknown, uptodate, updated, failed};
typedef std::function<target_state (target&)> recipe;
struct target_type
{
std::type_index id;
const char* name;
const target_type* base;
target* (*const factory) (path, std::string, const std::string*);
};
class target
{
public:
target (path d, std::string n, const std::string* e)
: directory (std::move (d)), name (std::move (n)), ext (e) {}
const path directory; // Absolute and normalized.
const std::string name;
const std::string* ext; // Extension, NULL means unspecified.
public:
typedef
std::vector<std::reference_wrapper<prerequisite>>
prerequisites_type;
prerequisites_type prerequisites;
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:
virtual const target_type& type () const = 0;
static const target_type static_type;
private:
recipe_type recipe_;
target_state state_ {target_state::unknown};
};
std::ostream&
operator<< (std::ostream&, const target&);
inline bool
operator< (const target& x, const target& y)
{
std::type_index tx (typeid (x)), ty (typeid (y));
//@@ TODO: use compare() to compare once.
// Unspecified and specified extension are assumed equal. The
// extension strings are from the pool, so we can just compare
// pointers.
//
return
(tx < ty) ||
(tx == ty && x.name < y.name) ||
(tx == ty && x.name == y.name && x.directory < y.directory) ||
(tx == ty && x.name == y.name && x.directory == y.directory &&
x.ext != nullptr && y.ext != nullptr && x.ext < y.ext);
}
typedef std::set<std::unique_ptr<target>, compare_pointer_target> target_set;
extern target_set targets;
extern target* default_target;
class target_type_map: public std::map<
const char*,
std::reference_wrapper<const target_type>,
compare_c_string>
{
public:
void
insert (const target_type& tt) {emplace (tt.name, tt);}
};
extern target_type_map target_types;
template <typename T>
target*
target_factory (path d, std::string n, const std::string* e)
{
return new T (std::move (d), std::move (n), e);
}
// 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;
public:
static const target_type static_type;
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;
public:
static const target_type static_type;
private:
path_type path_;
};
// File target.
//
class file: public path_target
{
public:
using path_target::path_target;
public:
virtual const target_type& type () const {return static_type;}
static const target_type static_type;
};
}
#endif // BUILD_TARGET
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