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+# Copyright 2001, 2002 Dave Abrahams
+# 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)
+
+import errors ;
+
+
+rule trim-leading-zeroes ( value )
+{
+ return [ CALC $(value) + 0 ] ;
+}
+
+
+rule check ( numbers * )
+{
+ for local n in $(numbers)
+ {
+ switch $(n)
+ {
+ case *[^0-9]* :
+ errors.error $(n) "in" $(numbers) : is not a number ;
+ }
+ }
+}
+
+
+rule increment ( number )
+{
+ return [ CALC $(number) + 1 ] ;
+}
+
+
+rule decrement ( number )
+{
+ return [ CALC $(number) - 1 ] ;
+}
+
+
+rule range ( start finish ? : step ? )
+{
+ if ! $(finish)
+ {
+ finish = $(start) ;
+ start = 1 ;
+ }
+ step ?= 1 ;
+
+ check $(start) $(finish) $(step) ;
+
+ if $(finish) != 0
+ {
+ local result ;
+ while [ less $(start) $(finish) ] || $(start) = $(finish)
+ {
+ result += $(start) ;
+ start = [ CALC $(start) + $(step) ] ;
+ }
+ return $(result) ;
+ }
+}
+
+
+rule less ( n1 n2 )
+{
+ switch [ CALC $(n2) - $(n1) ]
+ {
+ case [1-9]* : return true ;
+ }
+}
+
+
+rule log10 ( number )
+{
+ switch $(number)
+ {
+ case *[^0-9]* : errors.error $(number) is not a number ;
+ case 0 : errors.error can't take log of zero ;
+ case [1-9] : return 0 ;
+ case [1-9]? : return 1 ;
+ case [1-9]?? : return 2 ;
+ case [1-9]??? : return 3 ;
+ case [1-9]???? : return 4 ;
+ case [1-9]????? : return 5 ;
+ case [1-9]?????? : return 6 ;
+ case [1-9]??????? : return 7 ;
+ case [1-9]???????? : return 8 ;
+ case [1-9]????????? : return 9 ;
+ case * :
+ {
+ import sequence ;
+ import string ;
+ local chars = [ string.chars $(number) ] ;
+ while $(chars[1]) = 0
+ {
+ chars = $(chars[2-]) ;
+ }
+ if ! $(chars)
+ {
+ errors.error can't take log of zero ;
+ }
+ else
+ {
+ return [ decrement [ sequence.length $(chars) ] ] ;
+ }
+ }
+ }
+}
+
+
+rule __test__ ( )
+{
+ import assert ;
+
+ assert.result 1 : increment 0 ;
+ assert.result 2 : increment 1 ;
+ assert.result 1 : decrement 2 ;
+ assert.result 0 : decrement 1 ;
+ assert.result 50 : increment 49 ;
+ assert.result 49 : decrement 50 ;
+ assert.result 99 : increment 98 ;
+ assert.result 99 : decrement 100 ;
+ assert.result 100 : increment 99 ;
+ assert.result 999 : decrement 1000 ;
+ assert.result 1000 : increment 999 ;
+
+ assert.result 1 2 3 : range 3 ;
+ assert.result 1 2 3 4 5 6 7 8 9 10 11 12 : range 12 ;
+ assert.result 3 4 5 6 7 8 9 10 11 : range 3 11 ;
+ assert.result : range 0 ;
+ assert.result 1 4 7 10 : range 10 : 3 ;
+ assert.result 2 4 6 8 10 : range 2 10 : 2 ;
+ assert.result 25 50 75 100 : range 25 100 : 25 ;
+
+ assert.result 0 : trim-leading-zeroes 0 ;
+ assert.result 1234 : trim-leading-zeroes 1234 ;
+ assert.result 123456 : trim-leading-zeroes 0000123456 ;
+ assert.result 1000123456 : trim-leading-zeroes 1000123456 ;
+ assert.result 10000 : trim-leading-zeroes 10000 ;
+ assert.result 10000 : trim-leading-zeroes 00010000 ;
+
+ assert.true less 1 2 ;
+ assert.true less 1 12 ;
+ assert.true less 1 21 ;
+ assert.true less 005 217 ;
+ assert.false less 0 0 ;
+ assert.false less 03 3 ;
+ assert.false less 3 03 ;
+ assert.true less 005 217 ;
+ assert.true less 0005 217 ;
+ assert.true less 5 00217 ;
+
+ # TEMPORARY disabled, because nested "try"/"catch" do not work and I do no
+ # have the time to fix that right now.
+ if $(0)
+ {
+ try ;
+ {
+ decrement 0 ;
+ }
+ catch can't decrement zero! ;
+
+ try ;
+ {
+ check foo ;
+ }
+ catch : not a number ;
+
+ try ;
+ {
+ increment foo ;
+ }
+ catch : not a number ;
+
+ try ;
+ {
+ log10 0 ;
+ }
+ catch can't take log of zero ;
+
+ try ;
+ {
+ log10 000 ;
+ }
+ catch can't take log of zero ;
+
+ }
+
+ assert.result 0 : log10 1 ;
+ assert.result 0 : log10 9 ;
+ assert.result 1 : log10 10 ;
+ assert.result 1 : log10 99 ;
+ assert.result 2 : log10 100 ;
+ assert.result 2 : log10 101 ;
+ assert.result 2 : log10 125 ;
+ assert.result 2 : log10 999 ;
+ assert.result 3 : log10 1000 ;
+ assert.result 10 : log10 12345678901 ;
+
+ for local x in [ range 75 110 : 5 ]
+ {
+ for local y in [ range $(x) 111 : 3 ]
+ {
+ if $(x) != $(y)
+ {
+ assert.true less $(x) $(y) ;
+ }
+ }
+ }
+
+ for local x in [ range 90 110 : 2 ]
+ {
+ for local y in [ range 80 $(x) : 4 ]
+ {
+ assert.false less $(x) $(y) ;
+ }
+ }
+}