Replace per-file copyright notices with a single file

[builder.git] / source / target.h

diff --git a/source/target.h b/source/target.h
index 04a360dab57394ec23c305b69825a80135edcee9..9d804129be37eaf4c695c3e783a72b59069c02b0 100644 (file)
--- a/source/target.h
+++ b/source/target.h
@@ -1,15 +1,9 @@
-/* $Id$
-
-This file is part of builder
-Copyright © 2006-2007 Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
 #ifndef TARGET_H_
 #define TARGET_H_
 
 #include <list>
 #include <map>
+#include <set>
 #include <string>
 #include <msp/time/timestamp.h>
 
@@ -22,61 +16,89 @@ typedef std::list<Target *> TargetList;
 
 /**
 Targets make up the build graph.  This class is a base for all target types and
-handles many common tasks.  Most targets are associated with a file.
+handles many common tasks.  See also FileTarget and VirtualTarget.
 */
 class Target
 {
+protected:
+       Builder &builder;
+       const Package *package;
+       std::string name;
+
+       bool buildable;
+       bool building;
+       bool rebuild;
+       std::string rebuild_reason;
+
+       TargetList depends;
+       bool deps_ready;
+
+       bool preparing;
+       bool prepared;
+
+       Target(Builder &, const Package *, const std::string &);
 public:
-       const std::string  &get_name() const           { return name; }
-       Target             *get_buildable_target();
-       bool               get_buildable() const       { return buildable; }
-       bool               get_rebuild() const         { return rebuild; }
-       const std::string  &get_rebuild_reason() const { return rebuild_reason; }
-       const Msp::Time::TimeStamp &get_mtime() const  { return mtime; }
-       virtual const char *get_type() const=0;
-       const TargetList   &get_depends() const        { return depends; }
-       const Package      *get_package() const        { return package; }
-       bool               get_depends_ready() const   { return deps_ready; }
-       void               add_depend(Target *);
-       virtual void       prepare();
+       virtual ~Target() { }
+
+       virtual const char *get_type() const = 0;
+       const std::string &get_name() const { return name; }
+       const Package *get_package() const { return package; }
+
+       /**
+       Tries to locate a target that will help getting this target built.  If all
+       dependencies are up-to-date, returns this target.  If there are no targets
+       ready to be built (maybe because they are being built right now), returns 0.
+       */
+       virtual Target *get_buildable_target();
+
+       /**
+       If this target is a proxy for another (such as Install or Symlink), return
+       that target.  Otherwise, return the target itself.
+
+       Implementors should call the function recursively to find the final target.
+       */
+       virtual Target *get_real_target() { return this; }
+
+       bool is_buildable() const { return buildable; }
+       bool get_rebuild() const { return rebuild; }
+       const std::string &get_rebuild_reason() const { return rebuild_reason; }
+       void add_depend(Target *);
+       const TargetList &get_depends() const { return depends; }
+       bool get_depends_ready() const { return deps_ready; }
 
        /**
        Finds dependencies for the target.  When all dependencies have been found,
        the function should set deps_ready to true.
        */
-       virtual void       find_depends()              { deps_ready=true; }
+       virtual void find_depends() { deps_ready = true; }
 
        /**
-       Creates and returns an Action suitable for building this target.
+       Prepares the target by recursively preparing dependencies, then checking
+       whether rebuilding is needed.  A flag is used to prevent unnecessary
+       executions.
        */
-       Action             *build();
+       virtual void prepare();
 
-       void               reset_count()               { counted=false; }
-       virtual unsigned   count_rebuild();
-       void               touch();
-       virtual ~Target() { }
+       /**
+       Starts building the target.  Returns the Action used for building.
+       */
+       Action *build();
 protected:
-       Builder       &builder;
-       const Package *package;
-       std::string   name;
-       Msp::Time::TimeStamp mtime;
-
-       bool          buildable;
-       bool          building;
-       bool          rebuild;
-       std::string   rebuild_reason;
-
-       TargetList    depends;
-       TargetList    rdepends;
-       bool          deps_ready;
+       void mark_rebuild(const std::string &);
 
-       bool          prepared;
-       bool          counted;
+       /**
+       Checks if the target needs to be rebuilt and why.
+       */
+       virtual void check_rebuild() = 0;
 
-       Target(Builder &, const Package *, const std::string &);
-       void         mark_rebuild(const std::string &);
-       virtual void check_rebuild();
+       /**
+       Creates and returns an Action suitable for building this target.
+       */
        virtual Action *create_action() =0;
+
+       /**
+       Handler for the build_done signal of Action.
+       */
        virtual void build_done();
 };