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Diffstat (limited to 'jam-files/boost-build/kernel/class.jam')
| -rw-r--r-- | jam-files/boost-build/kernel/class.jam | 420 |
1 files changed, 0 insertions, 420 deletions
diff --git a/jam-files/boost-build/kernel/class.jam b/jam-files/boost-build/kernel/class.jam deleted file mode 100644 index b8e55af3..00000000 --- a/jam-files/boost-build/kernel/class.jam +++ /dev/null @@ -1,420 +0,0 @@ -# Copyright 2001, 2002, 2003 Dave Abrahams -# Copyright 2002, 2005 Rene Rivera -# Copyright 2002, 2003 Vladimir Prus -# Distributed under the Boost Software License, Version 1.0. -# (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) - -# Polymorphic class system built on top of core Jam facilities. -# -# Classes are defined by 'class' keywords:: -# -# class myclass -# { -# rule __init__ ( arg1 ) # constructor -# { -# self.attribute = $(arg1) ; -# } -# -# rule method1 ( ) # method -# { -# return [ method2 ] ; -# } -# -# rule method2 ( ) # method -# { -# return $(self.attribute) ; -# } -# } -# -# The __init__ rule is the constructor, and sets member variables. -# -# New instances are created by invoking [ new <class> <args...> ]: -# -# local x = [ new myclass foo ] ; # x is a new myclass object -# assert.result foo : [ $(x).method1 ] ; # $(x).method1 returns "foo" -# -# Derived class are created by mentioning base classes in the declaration:: -# -# class derived : myclass -# { -# rule __init__ ( arg ) -# { -# myclass.__init__ $(arg) ; # call base __init__ -# -# } -# -# rule method2 ( ) # method override -# { -# return $(self.attribute)XXX ; -# } -# } -# -# All methods operate virtually, replacing behavior in the base classes. For -# example:: -# -# local y = [ new derived foo ] ; # y is a new derived object -# assert.result fooXXX : [ $(y).method1 ] ; # $(y).method1 returns "foo" -# -# Each class instance is its own core Jam module. All instance attributes and -# methods are accessible without additional qualification from within the class -# instance. All rules imported in class declaration, or visible in base classses -# are also visible. Base methods are available in qualified form: -# base-name.method-name. By convention, attribute names are prefixed with -# "self.". - -import modules ; -import numbers ; - - -rule xinit ( instance : class ) -{ - module $(instance) - { - __class__ = $(2) ; - __name__ = $(1) ; - } -} - - -rule new ( class args * : * ) -{ - .next-instance ?= 1 ; - local id = object($(class))@$(.next-instance) ; - - xinit $(id) : $(class) ; - - INSTANCE $(id) : class@$(class) ; - IMPORT_MODULE $(id) ; - $(id).__init__ $(args) : $(2) : $(3) : $(4) : $(5) : $(6) : $(7) : $(8) : $(9) ; - - # Bump the next unique object name. - .next-instance = [ numbers.increment $(.next-instance) ] ; - - # Return the name of the new instance. - return $(id) ; -} - - -rule bases ( class ) -{ - module class@$(class) - { - return $(__bases__) ; - } -} - - -rule is-derived ( class : bases + ) -{ - local stack = $(class) ; - local visited found ; - while ! $(found) && $(stack) - { - local top = $(stack[1]) ; - stack = $(stack[2-]) ; - if ! ( $(top) in $(visited) ) - { - visited += $(top) ; - stack += [ bases $(top) ] ; - - if $(bases) in $(visited) - { - found = true ; - } - } - } - return $(found) ; -} - - -# Returns true if the 'value' is a class instance. -# -rule is-instance ( value ) -{ - return [ MATCH "^(object\\()[^@]+\\)@.*" : $(value) ] ; -} - - -# Check if the given value is of the given type. -# -rule is-a ( - instance # The value to check. - : type # The type to test for. -) -{ - if [ is-instance $(instance) ] - { - return [ class.is-derived [ modules.peek $(instance) : __class__ ] : $(type) ] ; - } -} - - -local rule typecheck ( x ) -{ - local class-name = [ MATCH "^\\[(.*)\\]$" : [ BACKTRACE 1 ] ] ; - if ! [ is-a $(x) : $(class-name) ] - { - return "Expected an instance of "$(class-name)" but got \""$(x)"\" for argument" ; - } -} - - -rule __test__ ( ) -{ - import assert ; - import "class" : new ; - - # This will be the construction function for a class called 'myclass'. - # - class myclass - { - import assert ; - - rule __init__ ( x_ * : y_ * ) - { - # Set some instance variables. - x = $(x_) ; - y = $(y_) ; - foo += 10 ; - } - - rule set-x ( newx * ) - { - x = $(newx) ; - } - - rule get-x ( ) - { - return $(x) ; - } - - rule set-y ( newy * ) - { - y = $(newy) ; - } - - rule get-y ( ) - { - return $(y) ; - } - - rule f ( ) - { - return [ g $(x) ] ; - } - - rule g ( args * ) - { - if $(x) in $(y) - { - return $(x) ; - } - else if $(y) in $(x) - { - return $(y) ; - } - else - { - return ; - } - } - - rule get-class ( ) - { - return $(__class__) ; - } - - rule get-instance ( ) - { - return $(__name__) ; - } - - rule invariant ( ) - { - assert.equal 1 : 1 ; - } - - rule get-foo ( ) - { - return $(foo) ; - } - } -# class myclass ; - - class derived1 : myclass - { - rule __init__ ( z_ ) - { - myclass.__init__ $(z_) : X ; - z = $(z_) ; - } - - # Override g. - # - rule g ( args * ) - { - return derived1.g ; - } - - rule h ( ) - { - return derived1.h ; - } - - rule get-z ( ) - { - return $(z) ; - } - - # Check that 'assert.equal' visible in base class is visible here. - # - rule invariant2 ( ) - { - assert.equal 2 : 2 ; - } - - # Check that 'assert.variable-not-empty' visible in base class is - # visible here. - # - rule invariant3 ( ) - { - local v = 10 ; - assert.variable-not-empty v ; - } - } -# class derived1 : myclass ; - - class derived2 : myclass - { - rule __init__ ( ) - { - myclass.__init__ 1 : 2 ; - } - - # Override g. - # - rule g ( args * ) - { - return derived2.g ; - } - - # Test the ability to call base class functions with qualification. - # - rule get-x ( ) - { - return [ myclass.get-x ] ; - } - } -# class derived2 : myclass ; - - class derived2a : derived2 - { - rule __init__ - { - derived2.__init__ ; - } - } -# class derived2a : derived2 ; - - local rule expect_derived2 ( [derived2] x ) { } - - local a = [ new myclass 3 4 5 : 4 5 ] ; - local b = [ new derived1 4 ] ; - local b2 = [ new derived1 4 ] ; - local c = [ new derived2 ] ; - local d = [ new derived2 ] ; - local e = [ new derived2a ] ; - - expect_derived2 $(d) ; - expect_derived2 $(e) ; - - # Argument checking is set up to call exit(1) directly on failure, and we - # can not hijack that with try, so we should better not do this test by - # default. We could fix this by having errors look up and invoke the EXIT - # rule instead; EXIT can be hijacked (;-) - if --fail-typecheck in [ modules.peek : ARGV ] - { - try ; - { - expect_derived2 $(a) ; - } - catch - "Expected an instance of derived2 but got" instead - ; - } - - #try ; - #{ - # new bad_subclass ; - #} - #catch - # bad_subclass.bad_subclass failed to call base class constructor myclass.__init__ - # ; - - #try ; - #{ - # class bad_subclass ; - #} - #catch bad_subclass has already been declared ; - - assert.result 3 4 5 : $(a).get-x ; - assert.result 4 5 : $(a).get-y ; - assert.result 4 : $(b).get-x ; - assert.result X : $(b).get-y ; - assert.result 4 : $(b).get-z ; - assert.result 1 : $(c).get-x ; - assert.result 2 : $(c).get-y ; - assert.result 4 5 : $(a).f ; - assert.result derived1.g : $(b).f ; - assert.result derived2.g : $(c).f ; - assert.result derived2.g : $(d).f ; - - assert.result 10 : $(b).get-foo ; - - $(a).invariant ; - $(b).invariant2 ; - $(b).invariant3 ; - - # Check that the __class__ attribute is getting properly set. - assert.result myclass : $(a).get-class ; - assert.result derived1 : $(b).get-class ; - assert.result $(a) : $(a).get-instance ; - - $(a).set-x a.x ; - $(b).set-x b.x ; - $(c).set-x c.x ; - $(d).set-x d.x ; - assert.result a.x : $(a).get-x ; - assert.result b.x : $(b).get-x ; - assert.result c.x : $(c).get-x ; - assert.result d.x : $(d).get-x ; - - class derived3 : derived1 derived2 - { - rule __init__ ( ) - { - } - } - - assert.result : bases myclass ; - assert.result myclass : bases derived1 ; - assert.result myclass : bases derived2 ; - assert.result derived1 derived2 : bases derived3 ; - - assert.true is-derived derived1 : myclass ; - assert.true is-derived derived2 : myclass ; - assert.true is-derived derived3 : derived1 ; - assert.true is-derived derived3 : derived2 ; - assert.true is-derived derived3 : derived1 derived2 myclass ; - assert.true is-derived derived3 : myclass ; - - assert.false is-derived myclass : derived1 ; - - assert.true is-instance $(a) ; - assert.false is-instance bar ; - - assert.true is-a $(a) : myclass ; - assert.true is-a $(c) : derived2 ; - assert.true is-a $(d) : myclass ; - assert.false is-a literal : myclass ; -} |