#  Copyright (C) Vladimir Prus 2002. Permission to copy, use, modify, sell and
#  distribute this software is granted provided this copyright notice appears in
#  all copies. This software is provided "as is" without express or implied
#  warranty, and with no claim as to its suitability for any purpose.

#  This module defines the 'make' rule and associated class, derived from
#  'basic-target'.  

import targets ;
import class : class new ;
import property ;
import errors : error ;

rule make-target-class ( name : project : sources * : requirements * 
                         : make-rule + : default-build )
{
    basic-target.__init__ $(name) : $(project) : $(sources) : $(requirements) 
                          : $(default-build) ;
    self.make-rule = $(make-rule) ;    
    
    rule construct ( source-targets * : properties * )
    {
        local t = [ new virtual-target $(self.name)
                    : $(self.project) : [ property.remove free incidental : $(properties) ] ] ;
        local a = [ new action $(t) : $(source-targets) : $(self.make-rule) 
                    : $(properties) ] ;
        $(t).action $(a) ;
        return $(t) ;    
    }   
}

class make-target-class : basic-target ;

rule make ( target-name : sources * : generating-rule : requirements * )
{
    local project-module = [ CALLER_MODULE ] ;
    local location = [ project.attribute $(project-module) location ] ;
    local ptarget = [ project.target $(location) ] ;
    local default-build = [ project.attribute $(project-module) default-build ] ;


    local pr = [ project.attribute $(project-module) requirements ] ;

    # Don't do anything meaningfull on errors. This will be handled when 
    # we implement target types.
    requirements = [ property.refine $(pr) : $(requirements) ] ;
    if $(requirements[1]) = "@error" 
    {
        error "Conflicting requirements for target:" $(requirements) ;
    }


    local target = [ $(ptarget).main-target $(target-name) ] ;

    $(target).add-alternative
        [ new make-target-class $(target-name) : $(project-module) : $(sources) 
          : $(requirements) : $(generating-rule) : $(default-build) ] ;
}

IMPORT $(__name__) : make : : make ;