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// file : build/scope.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <build/scope>
#include <build/target>
using namespace std;
namespace build
{
// scope
//
lookup<const value> scope::
operator[] (const variable& var) const
{
const value* r (nullptr);
const scope* s (this);
for (; s != nullptr; s = s->parent_scope ())
{
if ((r = s->vars.find (var)) != nullptr)
break;
}
return lookup<const value> (r, &s->vars);
}
value& scope::
append (const variable& var)
{
auto l (operator[] (var));
if (l && l.belongs (*this)) // Existing variable in this scope.
return const_cast<value&> (*l);
value& r (assign (var));
if (l)
r = *l; // Copy value from the outer scope.
return r;
}
const target_type* scope::
find_target_type (const char* tt, const scope** rs) const
{
// Search scopes outwards, stopping at the project root.
//
for (const scope* s (this);
s != nullptr;
s = s->root () ? global_scope : s->parent_scope ())
{
if (s->target_types.empty ())
continue;
auto i (s->target_types.find (tt));
if (i != s->target_types.end ())
{
if (rs != nullptr)
*rs = s;
return &i->second.get ();
}
}
return nullptr;
}
const target_type* scope::
find_target_type (name& n, const string*& ext) const
{
ext = nullptr;
string& v (n.value);
// First determine the target type.
//
const char* tt;
if (n.untyped ())
{
// Empty name or '.' and '..' signify a directory.
//
if (v.empty () || v == "." || v == "..")
tt = "dir";
else
//@@ TODO: derive type from extension.
//
tt = "file";
}
else
tt = n.type.c_str ();
const target_type* r (find_target_type (tt));
if (r == nullptr)
return r;
// Directories require special name processing. If we find that more
// targets deviate, then we should make this target-type-specific.
//
if (r->is_a<dir> () || r->is_a<fsdir> ())
{
// The canonical representation of a directory name is with empty
// value.
//
if (!v.empty ())
{
n.dir /= dir_path (v); // Move name value to dir.
v.clear ();
}
}
else
{
// Split the path into its directory part (if any) the name part,
// and the extension (if any). We cannot assume the name part is
// a valid filesystem name so we will have to do the splitting
// manually.
//
path::size_type i (path::traits::rfind_separator (v));
if (i != string::npos)
{
n.dir /= dir_path (v, i != 0 ? i : 1); // Special case: "/".
v = string (v, i + 1, string::npos);
}
// Extract the extension.
//
string::size_type j (path::traits::find_extension (v));
if (j != string::npos)
{
ext = &extension_pool.find (v.c_str () + j + 1);
v.resize (j);
}
}
return r;
}
// scope_map
//
scope_map scopes;
scope* global_scope;
pair<scope&, bool> scope_map::
insert (const dir_path& k, bool root)
{
auto er (emplace (k, scope ()));
scope& s (er.first->second);
if (er.second)
{
scope* p (nullptr);
// Update scopes of which we are a new parent/root (unless this
// is the global scope).
//
if (size () > 1)
{
// The first entry is ourselves.
//
auto r (find_prefix (k));
for (++r.first; r.first != r.second; ++r.first)
{
scope& c (r.first->second);
// The first scope of which we are a parent is the least
// (shortest) one which means there is no other scope
// between it and our parent.
//
if (p == nullptr)
p = c.parent_;
if (root && c.root_ == p->root_) // No intermediate root.
c.root_ = &s;
if (p == c.parent_) // No intermediate parent.
c.parent_ = &s;
}
// We couldn't get the parent from one of its old children
// so we have to find it ourselves.
//
if (p == nullptr)
p = &find (k.directory ());
}
s.path_ = &er.first->first;
s.parent_ = p;
s.root_ = root ? &s : (p != nullptr ? p->root_ : nullptr);
}
else if (root && !s.root ())
{
// Upgrade to root scope.
//
auto r (find_prefix (k));
for (++r.first; r.first != r.second; ++r.first)
{
scope& c (r.first->second);
if (c.root_ == s.root_) // No intermediate root.
c.root_ = &s;
}
s.root_ = &s;
}
return pair<scope&, bool> (s, er.second);
}
// Find the most qualified scope that encompasses this path.
//
scope& scope_map::
find (const dir_path& k)
{
// Normally we would have a scope for the full path so try
// that before making any copies.
//
auto i (scope_map_base::find (k));
if (i != end ())
return i->second;
for (dir_path d (k.directory ());; d = d.directory ())
{
auto i (scope_map_base::find (d));
if (i != end ())
return i->second;
assert (!d.empty ()); // We should have the global scope.
}
}
}
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