aboutsummaryrefslogtreecommitdiff
path: root/build2/target-type.hxx
diff options
context:
space:
mode:
Diffstat (limited to 'build2/target-type.hxx')
-rw-r--r--build2/target-type.hxx138
1 files changed, 138 insertions, 0 deletions
diff --git a/build2/target-type.hxx b/build2/target-type.hxx
new file mode 100644
index 0000000..0b8ee54
--- /dev/null
+++ b/build2/target-type.hxx
@@ -0,0 +1,138 @@
+// file : build2/target-type.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+#ifndef BUILD2_TARGET_TYPE_HXX
+#define BUILD2_TARGET_TYPE_HXX
+
+#include <map>
+
+#include <build2/types.hxx>
+#include <build2/utility.hxx>
+
+namespace build2
+{
+ class scope;
+ class target;
+ class target_key;
+ class prerequisite_key;
+
+ // Target type.
+ //
+ // Note that we assume there is always a single instance of this class for
+ // any target type. As a result, we can use address comparison to determine
+ // if two target types are the same.
+ //
+ // If the extension derivation function is NULL, then it means this target
+ // type does not use extensions. Note that this is relied upon when deciding
+ // whether to print the extension; if the target does use extensions but the
+ // defaults could not (and its ok), could not (and its not ok), or should not
+ // (logically) be obtained, then use target_extension_{null,fail,assert}(),
+ // respectively. If the extension function returns NULL, then that means the
+ // default extension for this target could not be derived.
+ //
+ // The extension is used in two places: search_existing_file() (called for a
+ // prerequisite with the last argument true) and in target::derive_path()
+ // (called for a target with the last argument false); see their
+ // implementations for details.
+ //
+ // If the pattern function is not NULL, then it is used to amend a pattern
+ // or match (reverse is false) and then, if the amendment call returned
+ // true, to reverse it in the resulting matches.
+ //
+ struct target_type
+ {
+ const char* name;
+ const target_type* base;
+
+ // Return target and extension.
+ //
+ pair<target*, optional<string>> (*factory) (const target_type&,
+ dir_path,
+ dir_path,
+ string,
+ optional<string>);
+
+ optional<string> (*extension) (const target_key&,
+ const scope&,
+ bool search);
+
+ bool (*pattern) (const target_type&, const scope&, string&, bool reverse);
+
+ void (*print) (ostream&, const target_key&);
+
+ const target* (*search) (const target&, const prerequisite_key&);
+
+ bool see_through; // A group with the default "see through" semantics.
+
+ template <typename T>
+ bool
+ is_a () const {return is_a (T::static_type);}
+
+ bool
+ is_a (const target_type& tt) const
+ {
+ return this == &tt || (base != nullptr && is_a_base (tt));
+ }
+
+ bool
+ is_a_base (const target_type&) const; // Defined in target.cxx
+ };
+
+ inline bool
+ operator< (const target_type& x, const target_type& y) {return &x < &y;}
+
+ inline bool
+ operator== (const target_type& x, const target_type& y) {return &x == &y;}
+
+ inline bool
+ operator!= (const target_type& x, const target_type& y) {return &x != &y;}
+
+ inline ostream&
+ operator<< (ostream& os, const target_type& tt) {return os << tt.name;}
+
+ // Target type map.
+ //
+ struct target_type_ref
+ {
+ // Like reference_wrapper except it sometimes deletes the target type.
+ //
+ explicit
+ target_type_ref (const target_type& r): p_ (&r), d_ (false) {}
+
+ explicit
+ target_type_ref (unique_ptr<target_type>&& p)
+ : p_ (p.release ()), d_ (true) {}
+
+ target_type_ref (target_type_ref&& r)
+ : p_ (r.p_), d_ (r.d_) {r.p_ = nullptr;}
+
+ ~target_type_ref () {if (p_ != nullptr && d_) delete p_;}
+
+ explicit operator const target_type& () const {return *p_;}
+ const target_type& get () const {return *p_;}
+
+ private:
+ const target_type* p_;
+ bool d_;
+ };
+
+ using target_type_map_base = std::map<string, target_type_ref>;
+
+ class target_type_map: public target_type_map_base
+ {
+ public:
+ const target_type&
+ insert (const target_type& tt)
+ {
+ emplace (tt.name, target_type_ref (tt));
+ return tt;
+ }
+
+ template <typename T>
+ const target_type&
+ insert () {return insert (T::static_type);}
+ };
+}
+
+#endif // BUILD2_TARGET_TYPE_HXX