From 70317569c6dcd9809ed4a8c425777e653ec6ca08 Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Mon, 1 May 2017 18:24:31 +0300
Subject: Add hxx extension for headers

---
 build2/target-type.hxx | 138 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 138 insertions(+)
 create mode 100644 build2/target-type.hxx

(limited to 'build2/target-type.hxx')

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
-- 
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