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// file : libbuild2/target.txx -*- C++ -*-
// license : MIT; see accompanying LICENSE file
#include <libbutl/filesystem.mxx> // dir_iterator
#include <libbuild2/scope.hxx>
#include <libbuild2/diagnostics.hxx>
namespace build2
{
// prerequisite_members_range
//
template <typename T>
void prerequisite_members_range<T>::iterator::
switch_mode ()
{
// A group could be empty, so we may have to iterate.
//
do
{
g_ = resolve_members (*i_);
// Group could not be resolved.
//
if (g_.members == nullptr)
{
assert (r_->mode_ != members_mode::always);
return;
}
if (g_.count != 0) // Skip empty see through groups.
{
j_ = 1; // Start from the first group member.
break;
}
}
while (++i_ != r_->e_ && i_->type.see_through);
}
//
//
template <const char* ext>
const char*
target_extension_fix (const target_key& tk, const scope*)
{
// A generic file target type doesn't imply any extension while a very
// specific one (say man1) may have a fixed extension. So if one wasn't
// specified set it to fixed ext rather than unspecified. For file{}
// itself we make it empty which means we treat file{foo} as file{foo.}.
//
return tk.ext ? tk.ext->c_str () : ext;
}
template <const char* ext>
bool
target_pattern_fix (const target_type&,
const scope&,
string& v,
optional<string>& e,
const location& l,
bool r)
{
if (r)
{
// If we get called to reverse then it means we've added the extension
// in the first place.
//
assert (e);
e = nullopt;
}
else
{
e = target::split_name (v, l);
// We only add our extension if there isn't one already.
//
if (!e)
{
e = ext;
return true;
}
}
return false;
}
inline optional<string>
target_extension_var_impl (const target_type& tt,
const string& tn,
const scope& s,
const char* def)
{
// Include target type/pattern-specific variables.
//
if (auto l = s.lookup (*s.ctx.var_extension, tt, tn))
{
// Help the user here and strip leading '.' from the extension.
//
const string& e (cast<string> (l));
return !e.empty () && e.front () == '.' ? string (e, 1) : e;
}
return def != nullptr ? optional<string> (def) : nullopt;
}
template <const char* def>
optional<string>
target_extension_var (const target_key& tk,
const scope& s,
const char*,
bool)
{
return target_extension_var_impl (*tk.type, *tk.name, s, def);
}
template <const char* def>
bool
target_pattern_var (const target_type& tt,
const scope& s,
string& v,
optional<string>& e,
const location& l,
bool r)
{
if (r)
{
// If we get called to reverse then it means we've added the extension
// in the first place.
//
assert (e);
e = nullopt;
}
else
{
e = target::split_name (v, l);
// We only add our extension if there isn't one already.
//
if (!e)
{
// Use empty name as a target since we only want target type/pattern-
// specific variables that match any target ('*' but not '*.txt').
//
if ((e = target_extension_var_impl (tt, string (), s, def)))
return true;
}
}
return false;
}
// dir
//
template <typename K>
const target* dir::
search_implied (const scope& bs, const K& k, tracer& trace)
{
using namespace butl;
// See if we have any prerequisites.
//
prerequisites_type ps (collect_implied (bs));
if (ps.empty ())
return nullptr;
l5 ([&]{trace << "implying buildfile for " << k;});
// We behave as if this target was explicitly mentioned in the (implied)
// buildfile. Thus not implied.
//
target& t (bs.ctx.targets.insert (dir::static_type,
bs.out_path (),
dir_path (),
string (),
nullopt,
false,
trace).first);
t.prerequisites (move (ps));
return &t;
}
// exe
//
template <typename T>
const T* exe::
lookup_metadata (const char* var) const
{
if (auto* ns = cast_null<names> (vars[ctx.var_export_metadata]))
{
// Metadata variable prefix is in the second name.
//
assert (ns->size () == 2 && (*ns)[1].simple ());
return cast_null<T> (vars[(*ns)[1].value + '.' + var]);
}
return nullptr;
}
}
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