assert.jam

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# Copyright 2001, 2002, 2003 Dave Abrahams
# Copyright 2006 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)

import errors ;
import modules ;


################################################################################
#
# Private implementation details.
#
################################################################################

# Rule added as a replacement for the regular Jam = operator but which does not
# ignore trailing empty string elements.
#
local rule exact-equal-test ( lhs * : rhs * )
{
    local lhs_extended = $(lhs) xxx ;
    local rhs_extended = $(rhs) xxx ;
    if $(lhs_extended) = $(rhs_extended)
    {
        return true ;
    }
}


# Two lists are considered set-equal if they contain the same elements, ignoring
# duplicates and ordering.
#
local rule set-equal-test ( set1 * : set2 * )
{
    if ( $(set1) in $(set2) ) && ( $(set2) in $(set1) )
    {
        return true ;
    }
}


################################################################################
#
# Public interface.
#
################################################################################

# Assert the equality of A and B, ignoring trailing empty string elements.
#
rule equal ( a * : b * )
{
    if $(a) != $(b)
    {
        errors.error-skip-frames 3 assertion failure: \"$(a)\" "==" \"$(b)\"
            (ignoring trailing empty strings) ;
    }
}


# Assert that the result of calling RULE-NAME on the given arguments has a false
# logical value (is either an empty list or all empty strings).
#
rule false ( rule-name args * : * )
{
    local result ;
    module [ CALLER_MODULE ]
    {
        modules.poke assert : result : [ $(1) : $(2) : $(3) : $(4) : $(5) : $(6)
            : $(7) : $(8) : $(9) ] ;
    }

    if $(result)
    {
        errors.error-skip-frames 3 assertion failure: Expected false result from
            "[" $(rule-name) [ errors.lol->list $(args) : $(2) : $(3) : $(4) :
            $(5) : $(6) : $(7) : $(8) : $(9) ] "]" : Got: "[" \"$(result)\" "]" ;
    }
}


# Assert that ELEMENT is present in LIST.
#
rule "in" ( element : list * )
{
    if ! $(element) in $(list)
    {
        errors.error-skip-frames 3 assertion failure: Expected \"$(element)\" in
            "[" \"$(list)\" "]" ;
    }
}


# Assert the inequality of A and B, ignoring trailing empty string elements.
#
rule not-equal ( a * : b * )
{
    if $(a) = $(b)
    {
        errors.error-skip-frames 3 assertion failure: \"$(a)\" "!=" \"$(b)\"
            (ignoring trailing empty strings) ;
    }
}


# Assert that ELEMENT is not present in LIST.
#
rule not-in ( element : list * )
{
    if $(element) in $(list)
    {
        errors.error-skip-frames 3 assertion failure: Did not expect
            \"$(element)\" in "[" \"$(list)\" "]" ;
    }
}


# Assert the inequality of A and B as sets.
#
rule not-set-equal ( a * : b * )
{
    if [ set-equal-test $(a) : $(b) ]
    {
        errors.error-skip-frames 3 assertion failure: Expected "[" \"$(a)\" "]"
            and "[" \"$(b)\" "]" to not be equal as sets ;
    }
}


# Assert that A and B are not exactly equal, not ignoring trailing empty string
# elements.
#
rule not-exact-equal ( a * : b * )
{
    if [ exact-equal-test $(a) : $(b) ]
    {
        errors.error-skip-frames 3 assertion failure: \"$(a)\" "!=" \"$(b)\" ;
    }
}


# Assert that EXPECTED is the result of calling RULE-NAME with the given
# arguments.
#
rule result ( expected * : rule-name args * : * )
{
    local result ;
    module [ CALLER_MODULE ]
    {
        modules.poke assert : result : [ $(2) : $(3) : $(4) : $(5) : $(6) : $(7)
            : $(8) : $(9) ] ;
    }

    if ! [ exact-equal-test $(result) : $(expected) ]
    {
        errors.error-skip-frames 3 assertion failure: "[" $(rule-name) [
            errors.lol->list $(args) : $(3) : $(4) : $(5) : $(6) : $(7) : $(8) :
            $(9) ] "]" : Expected: "[" \"$(expected)\" "]" : Got: "["
            \"$(result)\" "]" ;
    }
}


# Assert that EXPECTED is set-equal (i.e. duplicates and ordering are ignored)
# to the result of calling RULE-NAME with the given arguments. Note that rules
# called this way may accept at most 8 parameters.
#
rule result-set-equal ( expected * : rule-name args * : * )
{
    local result ;
    module [ CALLER_MODULE ]
    {
        modules.poke assert : result : [ $(2) : $(3) : $(4) : $(5) : $(6) : $(7)
            : $(8) : $(9) ] ;
    }

    if ! [ set-equal-test $(result) : $(expected) ]
    {
        errors.error-skip-frames 3 assertion failure: "[" $(rule-name) [
            errors.lol->list $(args) : $(3) : $(4) : $(5) : $(6) : $(7) : $(8) :
            $(9) ] "]" : Expected: "[" \"$(expected)\" "]" : Got: "["
            \"$(result)\" "]" ;
    }
}


# Assert the equality of A and B as sets.
#
rule set-equal ( a * : b * )
{
    if ! [ set-equal-test $(a) : $(b) ]
    {
        errors.error-skip-frames 3 assertion failure: Expected "[" \"$(a)\" "]"
            and "[" \"$(b)\" "]" to be equal as sets ;
    }
}


# Assert that the result of calling RULE-NAME on the given arguments has a true
# logical value (is neither an empty list nor all empty strings).
#
rule true ( rule-name args * : * )
{
    local result ;
    module [ CALLER_MODULE ]
    {
        modules.poke assert : result : [ $(1) : $(2) : $(3) : $(4) : $(5) : $(6)
            : $(7) : $(8) : $(9) ] ;
    }

    if ! $(result)
    {
        errors.error-skip-frames 3 assertion failure: Expected true result from
            "[" $(rule-name) [ errors.lol->list $(args) : $(2) : $(3) : $(4) :
            $(5) : $(6) : $(7) : $(8) : $(9) ] "]" ;
    }
}


# Assert the exact equality of A and B, not ignoring trailing empty string
# elements.
#
rule exact-equal ( a * : b * )
{
    if ! [ exact-equal-test $(a) : $(b) ]
    {
        errors.error-skip-frames 3 assertion failure: \"$(a)\" "==" \"$(b)\" ;
    }
}


# Assert that the given variable is not an empty list.
#
rule variable-not-empty ( name )
{
    local value = [ modules.peek [ CALLER_MODULE ] : $(name) ] ;
    if ! $(value)-is-not-empty
    {
        errors.error-skip-frames 3 assertion failure: Expected variable
            \"$(name)\" not to be an empty list ;
    }
}


rule __test__ ( )
{
    # Helper rule used to avoid test duplication related to different list
    # equality test rules.
    #
    local rule run-equality-test ( equality-assert : ignore-trailing-empty-strings ? )
    {
        local not-equality-assert = not-$(equality-assert) ;

        # When the given equality test is expected to ignore trailing empty
        # strings some of the test results should be inverted.
        local not-equality-assert-i = not-$(equality-assert) ;
        if $(ignore-trailing-empty-strings)
        {
            not-equality-assert-i = $(equality-assert) ;
        }

            $(equality-assert)         :       ;
            $(equality-assert)   "" "" : "" "" ;
        $(not-equality-assert-i)       : "" "" ;
            $(equality-assert)   x     : x     ;
        $(not-equality-assert)         : x     ;
        $(not-equality-assert)   ""    : x     ;
        $(not-equality-assert)   "" "" : x     ;
        $(not-equality-assert-i) x     : x ""  ;
            $(equality-assert)   x ""  : x ""  ;
        $(not-equality-assert)   x     : "" x  ;
            $(equality-assert)   "" x  : "" x  ;

            $(equality-assert) 1 2 3 : 1 2 3   ;
        $(not-equality-assert) 1 2 3 : 3 2 1   ;
        $(not-equality-assert) 1 2 3 : 1 5 3   ;
        $(not-equality-assert) 1 2 3 : 1 "" 3  ;
        $(not-equality-assert) 1 2 3 : 1 1 2 3 ;
        $(not-equality-assert) 1 2 3 : 1 2 2 3 ;
        $(not-equality-assert) 1 2 3 : 5 6 7   ;

        # Extra variables used here just to make sure Boost Jam or Boost Build
        # do not handle lists with empty strings differently depending on
        # whether they are literals or stored in variables.

        local empty           =         ;
        local empty-strings   = "" ""   ;
        local x-empty-strings = x "" "" ;
        local empty-strings-x = "" "" x ;

            $(equality-assert)                      : $(empty)           ;
        $(not-equality-assert-i) ""                 : $(empty)           ;
        $(not-equality-assert-i) "" ""              : $(empty)           ;
        $(not-equality-assert-i)                    : $(empty-strings)   ;
        $(not-equality-assert-i) ""                 : $(empty-strings)   ;
            $(equality-assert)   "" ""              : $(empty-strings)   ;
            $(equality-assert)   $(empty)           : $(empty)           ;
            $(equality-assert)   $(empty-strings)   : $(empty-strings)   ;
        $(not-equality-assert-i) $(empty)           : $(empty-strings)   ;
            $(equality-assert)   $(x-empty-strings) : $(x-empty-strings) ;
            $(equality-assert)   $(empty-strings-x) : $(empty-strings-x) ;
        $(not-equality-assert)   $(empty-strings-x) : $(x-empty-strings) ;
        $(not-equality-assert-i) x                  : $(x-empty-strings) ;
        $(not-equality-assert)   x                  : $(empty-strings-x) ;
        $(not-equality-assert-i) x                  : $(x-empty-strings) ;
        $(not-equality-assert-i) x ""               : $(x-empty-strings) ;
            $(equality-assert)   x "" ""            : $(x-empty-strings) ;
        $(not-equality-assert)   x                  : $(empty-strings-x) ;
        $(not-equality-assert)   "" x               : $(empty-strings-x) ;
            $(equality-assert)   "" "" x            : $(empty-strings-x) ;
    }                                    


    # ---------------
    # Equality tests.
    # ---------------

    run-equality-test equal : ignore-trailing-empty-strings ;
    run-equality-test exact-equal ;


    # -------------------------
    # assert.set-equal() tests.
    # -------------------------

        set-equal         :         ;
    not-set-equal "" ""   :         ;
        set-equal "" ""   : ""      ;
        set-equal "" ""   : "" ""   ;
        set-equal a b c   : a b c   ;
        set-equal a b c   : b c a   ;
        set-equal a b c a : a b c   ;
        set-equal a b c   : a b c a ;
    not-set-equal a b c   : a b c d ;
    not-set-equal a b c d : a b c   ;
}