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+# Copyright 2001, 2002 Dave Abrahams
+# Copyright 2002, 2003, 2004, 2005 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 "class" : is-instance ;
+import errors ;
+
+
+# For all elements of 'list' which do not already have 'suffix', add 'suffix'.
+#
+rule apply-default-suffix ( suffix : list * )
+{
+ local result ;
+ for local i in $(list)
+ {
+ if $(i:S) = $(suffix)
+ {
+ result += $(i) ;
+ }
+ else
+ {
+ result += $(i)$(suffix) ;
+ }
+ }
+ return $(result) ;
+}
+
+
+# If 'name' contains a dot, returns the part before the last dot. If 'name'
+# contains no dot, returns it unmodified.
+#
+rule basename ( name )
+{
+ if $(name:S)
+ {
+ name = $(name:B) ;
+ }
+ return $(name) ;
+}
+
+
+# Return the file of the caller of the rule that called caller-file.
+#
+rule caller-file ( )
+{
+ local bt = [ BACKTRACE ] ;
+ return $(bt[9]) ;
+}
+
+
+# Tests if 'a' is equal to 'b'. If 'a' is a class instance, calls its 'equal'
+# method. Uses ordinary jam's comparison otherwise.
+#
+rule equal ( a b )
+{
+ if [ is-instance $(a) ]
+ {
+ return [ $(a).equal $(b) ] ;
+ }
+ else
+ {
+ if $(a) = $(b)
+ {
+ return true ;
+ }
+ }
+}
+
+
+# Tests if 'a' is less than 'b'. If 'a' is a class instance, calls its 'less'
+# method. Uses ordinary jam's comparison otherwise.
+#
+rule less ( a b )
+{
+ if [ is-instance $(a) ]
+ {
+ return [ $(a).less $(b) ] ;
+ }
+ else
+ {
+ if $(a) < $(b)
+ {
+ return true ;
+ }
+ }
+}
+
+
+# Returns the textual representation of argument. If it is a class instance,
+# class its 'str' method. Otherwise, returns the argument.
+#
+rule str ( value )
+{
+ if [ is-instance $(value) ]
+ {
+ return [ $(value).str ] ;
+ }
+ else
+ {
+ return $(value) ;
+ }
+}
+
+
+# Accepts a list of gristed values and returns them ungristed. Reports an error
+# in case any of the passed parameters is not gristed, i.e. surrounded in angle
+# brackets < and >.
+#
+rule ungrist ( names * )
+{
+ local result ;
+ for local name in $(names)
+ {
+ local stripped = [ MATCH ^<(.*)>$ : $(name) ] ;
+ if ! $(stripped)
+ {
+ errors.error "in ungrist $(names) : $(name) is not of the form <.*>" ;
+ }
+ result += $(stripped) ;
+ }
+ return $(result) ;
+}
+
+
+# If the passed value is quoted, unquotes it. Otherwise returns the value
+# unchanged.
+#
+rule unquote ( value ? )
+{
+ local match-result = [ MATCH ^(\")(.*)(\")$ : $(value) ] ;
+ if $(match-result)
+ {
+ return $(match-result[2]) ;
+ }
+ else
+ {
+ return $(value) ;
+ }
+}
+
+
+rule __test__ ( )
+{
+ import assert ;
+ import "class" : new ;
+ import errors : try catch ;
+
+ assert.result 123 : str 123 ;
+
+ class test-class__
+ {
+ rule __init__ ( ) { }
+ rule str ( ) { return "str-test-class" ; }
+ rule less ( a ) { return "yes, of course!" ; }
+ rule equal ( a ) { return "not sure" ; }
+ }
+
+ assert.result "str-test-class" : str [ new test-class__ ] ;
+ assert.true less 1 2 ;
+ assert.false less 2 1 ;
+ assert.result "yes, of course!" : less [ new test-class__ ] 1 ;
+ assert.true equal 1 1 ;
+ assert.false equal 1 2 ;
+ assert.result "not sure" : equal [ new test-class__ ] 1 ;
+
+ assert.result foo.lib foo.lib : apply-default-suffix .lib : foo.lib foo.lib
+ ;
+
+ assert.result foo : basename foo ;
+ assert.result foo : basename foo.so ;
+ assert.result foo.so : basename foo.so.1 ;
+
+ assert.result : unquote ;
+ assert.result "" : unquote "" ;
+ assert.result foo : unquote foo ;
+ assert.result \"foo : unquote \"foo ;
+ assert.result foo\" : unquote foo\" ;
+ assert.result foo : unquote \"foo\" ;
+ assert.result \"foo\" : unquote \"\"foo\"\" ;
+
+ assert.result : ungrist ;
+ assert.result foo : ungrist <foo> ;
+ assert.result <foo> : ungrist <<foo>> ;
+ assert.result foo bar : ungrist <foo> <bar> ;
+
+ try ;
+ {
+ ungrist "" ;
+ }
+ catch "in ungrist : is not of the form <.*>" ;
+
+ try ;
+ {
+ ungrist <> ;
+ }
+ catch "in ungrist <> : <> is not of the form <.*>" ;
+
+ try ;
+ {
+ ungrist foo ;
+ }
+ catch "in ungrist foo : foo is not of the form <.*>" ;
+
+ try ;
+ {
+ ungrist <foo ;
+ }
+ catch "in ungrist <foo : <foo is not of the form <.*>" ;
+
+ try ;
+ {
+ ungrist foo> ;
+ }
+ catch "in ungrist foo> : foo> is not of the form <.*>" ;
+
+ try ;
+ {
+ ungrist foo bar ;
+ }
+ catch "in ungrist foo : foo is not of the form <.*>" ;
+
+ try ;
+ {
+ ungrist foo <bar> ;
+ }
+ catch "in ungrist foo : foo is not of the form <.*>" ;
+
+ try ;
+ {
+ ungrist <foo> bar ;
+ }
+ catch "in ungrist bar : bar is not of the form <.*>" ;
+}