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// file : build/target.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
// license : MIT; see accompanying LICENSE file
#include <build/target>
#include <build/scope>
#include <build/search>
#include <build/context>
#include <build/diagnostics>
using namespace std;
namespace build
{
// target_type
//
const target_type*
resolve_target_type (const std::string name);
// target
//
ostream&
operator<< (ostream& os, const target& t)
{
os << t.type ().name << '{';
if (!t.dir.empty ())
{
string s (diag_relative_work (t.dir));
if (!s.empty ())
{
os << s;
if (!t.name.empty ())
os << path::traits::directory_separator;
}
}
os << t.name;
if (t.ext != nullptr && !t.ext->empty ())
os << '.' << *t.ext;
os << '}';
return os;
}
static target*
search_target (prerequisite& p)
{
// The default behavior is to look for an existing target in the
// prerequisite's directory scope.
//
return search_existing_target (p);
}
// target_set
//
auto target_set::
find (const key& k, tracer& trace) const -> iterator
{
iterator i (map_.find (k));
if (i != end ())
{
target& t (**i);
// Update the extension if the existing target has it unspecified.
//
const string* ext (*k.ext);
if (t.ext != ext)
{
level4 ([&]{
diag_record r (trace);
r << "assuming target " << t << " is the same as the one with ";
if (ext == nullptr)
r << "unspecified extension";
else if (ext->empty ())
r << "no extension";
else
r << "extension " << *ext;
});
if (ext != nullptr)
t.ext = ext;
}
}
return i;
}
pair<target&, bool> target_set::
insert (const target_type& tt,
path dir,
std::string name,
const std::string* ext,
tracer& trace)
{
iterator i (find (key {&tt.id, &dir, &name, &ext}, trace));
if (i != end ())
return pair<target&, bool> (**i, false);
unique_ptr<target> t (tt.factory (move (dir), move (name), ext));
i = map_.emplace (
make_pair (key {&tt.id, &t->dir, &t->name, &t->ext},
move (t))).first;
return pair<target&, bool> (**i, true);
}
target_set targets;
target* default_target = nullptr;
target_type_map target_types;
// path_target
//
timestamp path_target::
load_mtime () const
{
assert (!path_.empty ());
return path_mtime (path_);
}
// file target
//
static target*
search_file (prerequisite& p)
{
// First see if there is an existing target.
//
if (target* t = search_existing_target (p))
return t;
// Then look for an existing file in this target-type-specific
// list of paths (@@ TODO: comes from the variable).
//
if (p.dir.relative ())
{
paths sp;
sp.push_back (src_out (p.scope.path ())); // src_base
return search_existing_file (p, sp);
}
else
return nullptr;
}
// dir target
//
static target*
search_alias (prerequisite& p)
{
// For an alias/action we don't want to silently create a target
// since it will do nothing and it most likely not what the author
// intended.
//
if (target* t = search_existing_target (p))
return t;
fail << "no explicit target for prerequisite " << p;
}
// type info
//
const target_type target::static_type
{
typeid (target),
"target",
nullptr,
nullptr,
&search_target
};
const target_type mtime_target::static_type
{
typeid (mtime_target),
"mtime_target",
&target::static_type,
nullptr,
target::static_type.search
};
const target_type path_target::static_type
{
typeid (path_target),
"path_target",
&mtime_target::static_type,
nullptr,
mtime_target::static_type.search
};
const target_type file::static_type
{
typeid (file),
"file",
&path_target::static_type,
&target_factory<file>,
&search_file
};
const target_type dir::static_type
{
typeid (dir),
"dir",
&target::static_type,
&target_factory<dir>,
&search_alias
};
const target_type fsdir::static_type
{
typeid (fsdir),
"fsdir",
&target::static_type,
&target_factory<fsdir>,
target::static_type.search
};
}
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