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// file : libbuild2/prerequisite.cxx -*- C++ -*-
// license : MIT; see accompanying LICENSE file
#include <libbuild2/prerequisite.hxx>
#include <libbuild2/scope.hxx>
#include <libbuild2/target.hxx>
#include <libbuild2/context.hxx>
#include <libbuild2/diagnostics.hxx>
using namespace std;
namespace build2
{
// prerequisite_key
//
ostream&
operator<< (ostream& os, const prerequisite_key& pk)
{
if (pk.proj)
os << *pk.proj << '%';
//
// Don't print scope if we are project-qualified or the prerequisite's
// directory is absolute. In both these cases the scope is not used to
// resolve it to target.
//
else if (!pk.tk.dir->absolute ())
{
// Avoid printing './' in './:...', similar to what we do for the
// directory in target_key.
//
const dir_path& s (pk.scope->out_path ());
if (stream_verb (os).path < 1)
{
const string& r (diag_relative (s, false));
if (!r.empty ())
os << r << ':';
}
else
os << s << ':';
}
return os << pk.tk;
}
// prerequisite
//
static inline optional<string>
to_ext (const string* e)
{
return e != nullptr ? optional<string> (*e) : nullopt;
}
prerequisite::
prerequisite (const target_type& t, bool locked)
: proj (nullopt),
type (t.type ()),
dir (t.dir),
out (t.out), // @@ If it's empty, then we treat as undetermined?
name (t.name),
ext (to_ext (locked ? t.ext_locked () : t.ext ())),
scope (t.base_scope ()),
target (&t),
vars (*this, false /* shared */)
{
}
bool prerequisite::
belongs (const target_type& t) const
{
const auto& p (t.prerequisites ());
return !(p.empty () || this < &p.front () || this > &p.back ());
}
value& prerequisite::
append (const variable& var, const target_type& t)
{
if (value* r = vars.lookup_to_modify (var).first)
return *r;
value& r (assign (var)); // NULL.
// Note: pretty similar logic to target::append().
//
lookup l (t.lookup_original (var).first);
if (l.defined ())
r = *l; // Copy value (and type) from the target/outer scope.
return r;
}
// prerequisites
//
const prerequisites empty_prerequisites;
}
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