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// file : build/target.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <build/target>
#include <cassert>
#include <butl/filesystem>
#include <build/scope>
#include <build/search>
#include <build/algorithm>
#include <build/diagnostics>
using namespace std;
namespace build
{
// recipe
//
const recipe empty_recipe;
const recipe noop_recipe (&noop_action);
const recipe default_recipe (&default_action);
// target
//
scope& target::
base_scope () const
{
return scopes.find (dir);
}
scope& target::
root_scope () const
{
// This is tricky to cache so we do the lookup for now.
//
scope* r (scopes.find (dir).root_scope ());
assert (r != nullptr);
return *r;
}
value_proxy target::
operator[] (const variable& var) const
{
auto i (vars.find (var));
if (i != vars.end ())
// @@ Same issue as in variable_map: need ro_value_proxy.
return value_proxy (&const_cast<value_ptr&> (i->second), &vars);
if (group != nullptr)
return (*group)[var];
return base_scope ()[var];
}
value_proxy target::
append (const variable& var)
{
value_proxy val (operator[] (var));
if (val && val.belongs (*this)) // Existing variable in this target.
return val;
value_proxy r (assign (var));
if (val)
r = val; // Copy value from the outer scope.
return r;
}
ostream&
operator<< (ostream& os, const target& t)
{
return os << target_key {&t.type (), &t.dir, &t.name, &t.ext};
}
// target_set
//
target_set targets;
auto target_set::
find (const target_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,
dir_path dir,
string name,
const string* ext,
tracer& trace)
{
iterator i (find (target_key {&tt, &dir, &name, &ext}, trace));
bool r (i == end ());
if (r)
{
unique_ptr<target> pt (tt.factory (move (dir), move (name), ext));
i = map_.emplace (
make_pair (target_key {&tt, &pt->dir, &pt->name, &pt->ext},
move (pt))).first;
}
return pair<target&, bool> (**i, r);
}
ostream&
operator<< (ostream& os, const target_key& k)
{
// If the name is empty, then we want to print the directory
// inside {}, e.g., dir{bar/}, not bar/dir{}.
//
bool n (!k.name->empty ());
string d (diag_relative (*k.dir, false));
if (n)
os << d;
os << k.type->name << '{';
if (n)
{
os << *k.name;
if (*k.ext != nullptr && !(*k.ext)->empty ())
os << '.' << **k.ext;
}
else
os << d;
os << '}';
return os;
}
//
//
target_type_map target_types;
const target_type* target_type_map::
find (name& n, const string*& ext) const
{
ext = nullptr;
string& v (n.value);
// First determine the target type.
//
const char* tt;
if (n.type.empty ())
{
// 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 ();
auto i (find (tt));
if (i == end ())
return nullptr;
const target_type& ti (i->second);
// Directories require special name processing. If we find that more
// targets deviate, then we should make this target-type-specific.
//
if (ti.id == dir::static_type.id || ti.id == fsdir::static_type.id)
{
// 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 &ti;
}
// path_target
//
void path_target::
derive_path (const char* de, const char* np, const char* ns)
{
string n;
if (np != nullptr)
n += np;
n += name;
if (ns != nullptr)
n += ns;
// Update the extension.
//
// See also search_existing_file() if updating anything here.
//
if (ext == nullptr)
{
// If provided by the caller, then use that.
//
if (de != nullptr)
ext = &extension_pool.find (de);
//
// Otherwis see if the target type has function that will
// give us the default extension.
//
else if (auto f = type ().extension)
ext = &f (key (), base_scope ()); // Already from the pool.
else
fail << "no default extension for target " << *this;
}
// Add the extension.
//
if (!ext->empty ())
{
n += '.';
n += *ext;
}
path (dir / path_type (move (n)));
}
// file_target
//
timestamp file::
load_mtime () const
{
const path_type& f (path ());
assert (!f.empty ());
return file_mtime (f);
}
// Search functions.
//
target*
search_target (const prerequisite_key& pk)
{
// The default behavior is to look for an existing target in the
// prerequisite's directory scope.
//
return search_existing_target (pk);
}
target*
search_file (const prerequisite_key& pk)
{
// First see if there is an existing target.
//
if (target* t = search_existing_target (pk))
return t;
// Then look for an existing file in this target-type-specific
// list of paths (@@ TODO: comes from the variable).
//
if (pk.tk.dir->relative ())
{
dir_paths sp;
sp.push_back (src_out (pk.scope->path (), *pk.scope)); // src_base
return search_existing_file (pk, sp);
}
else
return nullptr;
}
static target*
search_alias (const prerequisite_key& pk)
{
// 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.
//
target* t (search_existing_target (pk));
if (t == nullptr)
fail << "no explicit target for prerequisite " << pk;
return t;
}
// type info
//
const target_type target::static_type
{
typeid (target),
"target",
nullptr,
nullptr,
nullptr,
&search_target,
};
const target_type target_group::static_type
{
typeid (target_group),
"target_group",
&target::static_type,
nullptr,
nullptr,
&search_target
};
const target_type mtime_target::static_type
{
typeid (mtime_target),
"mtime_target",
&target::static_type,
nullptr,
nullptr,
&search_target
};
const target_type path_target::static_type
{
typeid (path_target),
"path_target",
&mtime_target::static_type,
nullptr,
nullptr,
&search_target
};
static target*
file_factory (dir_path d, string n, const string* e)
{
// The file target type doesn't imply any extension. So if one
// wasn't specified, set it to empty rather than unspecified.
// In other words, we always treat file{foo} as file{foo.}.
//
return new file (move (d),
move (n),
(e != nullptr ? e : &extension_pool.find ("")));
}
const target_type file::static_type
{
typeid (file),
"file",
&path_target::static_type,
&file_factory,
nullptr, // Factory always assigns an extension.
&search_file
};
const target_type dir::static_type
{
typeid (dir),
"dir",
&target::static_type,
&target_factory<dir>,
nullptr, // Should never need.
&search_alias
};
const target_type fsdir::static_type
{
typeid (fsdir),
"fsdir",
&target::static_type,
&target_factory<fsdir>,
nullptr, // Should never need.
&search_target
};
}
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