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// file : build/scope -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef BUILD_SCOPE
#define BUILD_SCOPE
#include <functional> // function
#include <unordered_set>
#include <unordered_map>
#include <butl/path-map>
#include <build/types>
#include <build/variable>
#include <build/prerequisite>
#include <build/operation>
namespace build
{
class scope
{
public:
const dir_path&
path () const {return *path_;} // Absolute and normalized.
const dir_path&
src_path () const {return *src_path_;} // Corresponding src path.
const dir_path* src_path_ {nullptr}; // Cached src_{root,base} var value.
scope*
parent_scope () const {return parent_;}
// Root scope of this scope or NULL if this scope is not (yet)
// in any (known) project. Note that if the scope itself is
// root, then this function return this. To get to the outer
// root, query the root scope of the parent.
//
scope*
root_scope () const {return root_;}
bool
root () const {return root_ == this;}
// Variables.
//
public:
variable_map vars;
// Lookup, including in outer scopes. If you only want to lookup
// in this scope, do it on the the variables map directly.
//
value_proxy
operator[] (const variable&) const;
value_proxy
operator[] (const std::string& name) const
{
return operator[] (variable_pool.find (name));
}
// Return a value_proxy suitable for assignment. If the variable
// does not exist in this scope's map, then a new one with the
// NULL value is added and returned. Otherwise the existing value
// if returned.
//
value_proxy
assign (const variable& var)
{
return vars.assign (var);
}
value_proxy
assign (const std::string& name)
{
return assign (variable_pool.find (name));
}
// Return a value_proxy suitable for appending. If the variable
// does not exist in this scope's map, then outer scopes are
// searched for the same variable. If found then a new variable
// with the found value is added to this scope and returned.
// Otherwise this function proceeds as assign().
//
value_proxy
append (const variable&);
value_proxy
append (const std::string& name)
{
return append (variable_pool.find (name));
}
public:
prerequisite_set prerequisites;
// Meta/operations supported by this project (set on the root
// scope only).
//
meta_operation_table meta_operations;
operation_table operations;
typedef build::path path_type;
// Set of buildfiles already loaded for this scope. The included
// buildfiles are checked against the project's root scope while
// imported -- against the global scope (global_scope).
//
std::unordered_set<path_type> buildfiles;
private:
friend class scope_map;
friend class temp_scope;
scope () = default;
const dir_path* path_; // Pointer to the key in scope_map.
scope* parent_;
scope* root_;
};
// Temporary scope. The idea is to be able to create a temporary
// scope in order not to change the variables in the current scope.
// Such a scope is not entered in to the scope map. As a result it
// can only be used as a temporary set of variables. In particular,
// defining targets/prerequisites directly in such a scope will surely
// end up badly. Defining any nested scopes will be as if defining
// such a scope in the parent (since path() returns parent's path).
//
class temp_scope: public scope
{
public:
temp_scope (scope& p) {path_ = p.path_; parent_ = &p; root_ = p.root_;}
};
using scope_map_base = butl::dir_path_map<scope>;
class scope_map: public scope_map_base
{
public:
// Note that we assume the first insertion into the map is that
// of the global scope.
//
std::pair<scope&, bool>
insert (const dir_path&, bool root);
scope&
operator[] (const dir_path& p) {return insert (p, false).first;}
// Find the most qualified scope that encompasses this path.
//
scope&
find (const dir_path&);
scope&
find (const path& p)
{
// Natural thing to do here would be to call find (p.directory ()).
// However, there could be a situation where the passed path is a
// directory (i.e., the calling code does not know what it is dealing
// with), so let's use the whole path.
//
return find (dir_path (p.string ()));
}
};
extern scope_map scopes;
extern scope* global_scope;
}
#endif // BUILD_SCOPE
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