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// file : build2/config/utility.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <build2/config/utility>
#include <build2/context>
#include <build2/config/module>
using namespace std;
namespace build2
{
namespace config
{
pair<const value*, bool>
required (scope& r, const variable& var)
{
// This is a stripped-down version of the other required() twisted
// implementation.
pair<lookup, size_t> org (r.find_original (var));
bool n (false); // New flag.
lookup l (org.first);
// Treat an inherited value that was set to default as new.
//
if (l.defined () && l->extra)
n = true;
if (var.override != nullptr)
{
pair<lookup, size_t> ovr (r.find_override (var, move (org)));
if (l != ovr.first) // Overriden?
{
// Override is always treated as new.
//
n = true;
l = move (ovr.first);
}
}
if (l.defined () && current_mif->id == configure_id)
save_variable (r, var);
return pair<const value*, bool> (l.value, n);
}
const value&
optional (scope& r, const variable& var)
{
if (current_mif->id == configure_id)
save_variable (r, var);
auto l (r[var]);
return l.defined ()
? *l
: r.assign (var); // NULL.
}
bool
specified (scope& r, const string& ns)
{
// Search all outer scopes for any value in this namespace.
//
// What about "pure" overrides, i.e., those without any original values?
// Well, they will also be found since their names have the original
// variable as a prefix. But do they apply? Yes, since we haven't found
// any original values, they will be "visible"; see find_override() for
// details.
//
for (scope* s (&r); s != nullptr; s = s->parent_scope ())
{
for (auto p (s->vars.find_namespace (ns));
p.first != p.second;
++p.first)
{
const variable& var (p.first->first);
// Ignore config.*.configured.
//
if (var.name.size () < 11 ||
var.name.compare (var.name.size () - 11, 11, ".configured") != 0)
return true;
}
}
return false;
}
bool
unconfigured (scope& root, const string& ns)
{
// Note: not overridable.
//
const variable& var (var_pool.insert<bool> (ns + ".configured"));
if (current_mif->id == configure_id)
save_variable (root, var);
auto l (root[var]); // Include inherited values.
return l && !cast<bool> (l);
}
void
unconfigured (scope& root, const string& ns, bool v)
{
// Note: not overridable.
//
const variable& var (var_pool.insert<bool> (ns + ".configured"));
if (current_mif->id == configure_id)
save_variable (root, var);
root.assign (var) = !v;
}
void
save_variable (scope& r, const variable& var, uint64_t flags)
{
if (current_mif->id != configure_id)
return;
// The project might not be using the config module. But then how
// could we be configuring it? Good question.
//
if (module* m = r.modules.lookup<module> (module::name))
{
const string& n (var.name);
// First try to find the module with the name that is the longest
// prefix of this variable name.
//
saved_modules& sm (m->saved_modules);
auto i (sm.end ());
if (!sm.empty ())
{
i = sm.upper_bound (n);
// Get the greatest less than, if any. We might still not be a
// suffix. And we still have to check the last element if
// upper_bound() returned end().
//
if (i == sm.begin () || !sm.key_comp ().prefix ((--i)->first, n))
i = sm.end ();
}
// If no module matched, then create one based on the variable name.
//
if (i == sm.end ())
{
// @@ For now with 'config.' prefix.
//
i = sm.insert (string (n, 0, n.find ('.', 7)));
}
// Don't insert duplicates. The config.import vars are particularly
// susceptible to duplication.
//
saved_variables& sv (i->second);
auto j (sv.find (var));
if (j == sv.end ())
sv.push_back (saved_variable {var, flags});
else
assert (j->flags == flags);
}
}
}
}
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