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+# Copyright 2002, 2003, 2004, 2006 Vladimir Prus
+# Copyright 2008 Jurko Gospodnetic
+# 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)
+
+import errors ;
+import numbers ;
+
+major = "2011" ;
+minor = "04" ;
+
+rule boost-build ( )
+{
+ return "$(major).$(minor)-svn" ;
+}
+
+rule print ( )
+{
+ if [ verify-engine-version ]
+ {
+ ECHO "Boost.Build" [ boost-build ] ;
+ }
+}
+
+rule verify-engine-version ( )
+{
+ local v = [ modules.peek : JAM_VERSION ] ;
+
+ if $(v[1]) != $(major) || $(v[2]) != $(minor)
+ {
+ local argv = [ modules.peek : ARGV ] ;
+ local e = $(argv[1]) ;
+ local l = [ modules.binding version ] ;
+ l = $(l:D) ;
+ l = $(l:D) ;
+ ECHO "warning: mismatched versions of Boost.Build engine and core" ;
+ ECHO "warning: Boost.Build engine ($(e)) is $(v:J=.)" ;
+ ECHO "warning: Boost.Build core (at $(l)) is" [ boost-build ] ;
+ }
+ else
+ {
+ return true ;
+ }
+}
+
+
+
+# Utility rule for testing whether all elements in a sequence are equal to 0.
+#
+local rule is-all-zeroes ( sequence * )
+{
+ local result = "true" ;
+ for local e in $(sequence)
+ {
+ if $(e) != "0"
+ {
+ result = "" ;
+ }
+ }
+ return $(result) ;
+}
+
+
+# Returns "true" if the first version is less than the second one.
+#
+rule version-less ( lhs + : rhs + )
+{
+ numbers.check $(lhs) ;
+ numbers.check $(rhs) ;
+
+ local done ;
+ local result ;
+
+ while ! $(done) && $(lhs) && $(rhs)
+ {
+ if [ numbers.less $(lhs[1]) $(rhs[1]) ]
+ {
+ done = "true" ;
+ result = "true" ;
+ }
+ else if [ numbers.less $(rhs[1]) $(lhs[1]) ]
+ {
+ done = "true" ;
+ }
+ else
+ {
+ lhs = $(lhs[2-]) ;
+ rhs = $(rhs[2-]) ;
+ }
+ }
+ if ( ! $(done) && ! $(lhs) && ! [ is-all-zeroes $(rhs) ] )
+ {
+ result = "true" ;
+ }
+
+ return $(result) ;
+}
+
+
+# Returns "true" if the current JAM version version is at least the given
+# version.
+#
+rule check-jam-version ( version + )
+{
+ local version-tag = $(version:J=.) ;
+ if ! $(version-tag)
+ {
+ errors.error Invalid version specifier: : $(version:E="(undefined)") ;
+ }
+
+ if ! $(.jam-version-check.$(version-tag))-is-not-empty
+ {
+ local jam-version = [ modules.peek : JAM_VERSION ] ;
+ if ! $(jam-version)
+ {
+ errors.error "Unable to deduce Boost Jam version. Your Boost Jam"
+ "installation is most likely terribly outdated." ;
+ }
+ .jam-version-check.$(version-tag) = "true" ;
+ if [ version-less [ modules.peek : JAM_VERSION ] : $(version) ]
+ {
+ .jam-version-check.$(version-tag) = "" ;
+ }
+ }
+ return $(.jam-version-check.$(version-tag)) ;
+}
+
+
+rule __test__ ( )
+{
+ import assert ;
+
+ local jam-version = [ modules.peek : JAM_VERSION ] ;
+ local future-version = $(jam-version) ;
+ future-version += "1" ;
+
+ assert.true check-jam-version $(jam-version) ;
+ assert.false check-jam-version $(future-version) ;
+
+ assert.true version-less 0 : 1 ;
+ assert.false version-less 0 : 0 ;
+ assert.true version-less 1 : 2 ;
+ assert.false version-less 1 : 1 ;
+ assert.false version-less 2 : 1 ;
+ assert.true version-less 3 1 20 : 3 4 10 ;
+ assert.false version-less 3 1 10 : 3 1 10 ;
+ assert.false version-less 3 4 10 : 3 1 20 ;
+ assert.true version-less 3 1 20 5 1 : 3 4 10 ;
+ assert.false version-less 3 1 10 5 1 : 3 1 10 ;
+ assert.false version-less 3 4 10 5 1 : 3 1 20 ;
+ assert.true version-less 3 1 20 : 3 4 10 5 1 ;
+ assert.true version-less 3 1 10 : 3 1 10 5 1 ;
+ assert.false version-less 3 4 10 : 3 1 20 5 1 ;
+ assert.false version-less 3 1 10 : 3 1 10 0 0 ;
+ assert.false version-less 3 1 10 0 0 : 3 1 10 ;
+ assert.false version-less 3 1 10 0 : 3 1 10 0 0 ;
+ assert.false version-less 3 1 10 0 : 03 1 10 0 0 ;
+ assert.false version-less 03 1 10 0 : 3 1 10 0 0 ;
+
+ # TODO: Add tests for invalid input data being sent to version-less.
+}