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// file : build/scope -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
// license : MIT; see accompanying LICENSE file
#ifndef BUILD_SCOPE
#define BUILD_SCOPE
#include <functional> // function
#include <unordered_set>
#include <unordered_map>
#include <build/path>
#include <build/path-map>
#include <build/variable>
#include <build/prerequisite>
#include <build/operation>
namespace build
{
class scope
{
public:
const dir_path&
path () const {return i_->first;} // Absolute and normalized.
const dir_path&
src_path () const {return *src_path_;} // Corresponding src path.
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;}
// Variable lookup. Note that this is find, not find or insert like
// in the variable_map, because we also search in outer scopes. For
// the latter use the variables map directly.
//
public:
value_proxy
operator[] (const std::string&);
value_proxy
operator[] (const variable&);
const dir_path* src_path_ {nullptr}; // Cached src_{root,base} var value.
public:
variable_map variables;
const variable_map&
ro_variables () const {return variables;}
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;
// A map of buildfiles to trigger functions that are executed when
// such files are sourced. The path must be absolute and normalized.
//
// The passed path is the buildfile. If the returned value is true,
// then the file is sourced. If false -- the file is ignored. Note
// that currently triggers can only be registered on the project's
// root scope.
//
using trigger_type = std::function<bool (scope&, const path_type&)>;
std::unordered_map<path_type, trigger_type> triggers;
private:
friend class scope_map;
friend class temp_scope;
typedef dir_path_map<scope>::const_iterator iterator;
scope (): variables (*this) {}
iterator i_;
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/prerequsites 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) {i_ = p.i_; parent_ = &p; root_ = p.root_;}
};
class scope_map: public dir_path_map<scope>
{
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 ()));
}
private:
typedef dir_path_map<scope> base;
};
extern scope_map scopes;
extern scope* global_scope;
}
#endif // BUILD_SCOPE
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