src/build/property.jam

# Copyright 2001, 2002, 2003 Dave Abrahams
# Copyright 2006 Rene Rivera
# Copyright 2002, 2003, 2004, 2005, 2006 Vladimir Prus
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or copy at
# http://www.boost.org/LICENSE_1_0.txt)

import feature ;
import indirect ;
import path ;
import regex ;
import string ;
import sequence ;
import set ;
import utility ;


# Refines 'properties' by overriding any non-free and non-conditional properties
# for which a different value is specified in 'requirements'. Returns the
# resulting list of properties.
#
rule refine ( properties * : requirements * )
{
    local result ;
    local unset ;

    # Collect all non-free features in requirements
    for local r in $(requirements)
    {
        # Do not consider conditional requirements.
        if ! [ MATCH "(:<)" : $(r:G=) ] && ! free in [ feature.attributes $(r:G) ]
        {
            if ! $(r) in $(properties)
            {
                # Kill subfeatures of properties that we're changing
                local sub = [ modules.peek feature : $(r:G).subfeatures ] ;
                if $(sub)
                {
                    # non-specific subfeatures are still valid
                    sub = [ MATCH "(.*:.*)" : $(sub) ] ;
                    local name = [ utility.ungrist $(r:G) ] ;
                    unset += <$(name)-$(sub)> ;
                }
            }
            unset += $(r:G) ;
        }
    }

    # Remove properties that are overridden by requirements
    for local p in $(properties)
    {
        if [ MATCH "(:<)" : $(p:G=) ] || ! $(p:G) in $(unset)
        {
            result += $(p) ;
        }
    }

    return [ sequence.unique $(result) $(requirements) ] ;
}


# Removes all conditional properties whose conditions are not met. For those
# with met conditions, removes the condition. Properties in conditions are
# looked up in 'context'.
#
rule evaluate-conditionals-in-context ( properties * : context * )
{
    local base ;
    local conditionals ;
    local indirect ;
    for local p in $(properties)
    {
        if [ MATCH "(:<)" : $(p) ] && ! free in [ feature.attributes $(p:G) ]
        {
            conditionals += $(p) ;
        }
        else if $(p:G) = <conditional>
        {
            indirect += $(p) ;
        }
        else
        {
            base += $(p) ;
        }
    }

    local result = $(base) ;
    for local p in $(conditionals)
    {
        # Separate condition and property.
        local s = [ MATCH "^(.*):(<.*)" : $(p) ] ;
        # Split condition into individual properties.
        local condition = [ regex.split $(s[1]) "," ] ;
        # Evaluate condition.
        if ! [ MATCH ^(!).* : $(condition:G=) ]
        {
            # Only positive checks
            if $(condition) in $(context)
            {
                result += $(s[2]) ;
            }
        }
        else
        {
            # Have negative checks
            local fail ;
            while $(condition)
            {
                local c = $(condition[1]) ;
                local m = [ MATCH ^!(.*) : $(c) ] ;
                if $(m)
                {
                    local p = $(m:G=$(c:G)) ;
                    if $(p) in $(context)
                    {
                        fail = true ;
                        c = ;
                    }
                }
                else
                {
                    if ! $(c) in $(context)
                    {
                        fail = true ;
                        c = ;
                    }
                }
                condition = $(condition[2-]) ;
            }
            if ! $(fail)
            {
                result += $(s[2]) ;
            }
        }
    }
    # Import here to avoid cyclic dependency
    import project ;
    for local i in [ MATCH "^@(.*)" : $(indirect:G=) ]
    {
        # If the rule was set in a project module, translate paths
        # relative to that project's location.
        local m = [ indirect.get-module $(i) ] ;
        local p = [ project.target $(m) : allow-missing ] ;
        local new = [ indirect.call $(i) $(context) ] ;
        if $(p) && [ $(p).location ]
        {
            local location = [ $(p).location ] ;
            local project-id = [ project.attribute $(m) id ] ;
            project-id ?= [ path.root $(location) [ path.pwd ] ] ;
            result +=
                [ translate $(new) : $(project-id) : $(location) : $(m) ] ;
        }
        else
        {
            result += $(new) ;
        }
    }
    return $(result) ;
}


# Returns <relevant> properties indicating how the conditionals in
# properties affect feature relevance.  If the optional argument cond
# is passed, it is treated as extra conditions for all properties.
#
rule evaluate-conditional-relevance ( properties * :  cond * )
{
    cond = [ sequence.transform utility.ungrist : $(cond:G) ] ;
    local result ;
    for local p in $(properties)
    {
        # Separate condition and property.
        local s = [ MATCH "^(.*):(<.*)" : $(p) ] ;
        if ! $(s) || free in [ feature.attributes $(p:G) ]
        {
            local value = [ utility.ungrist $(p:G) ] ;
            result += <relevant>$(value):<relevant>$(cond) ;
        }
        else
        {
            local condition = [ regex.split $(s[1]) "," ] ;
            condition = [ MATCH "^!?(.*)" : $(condition) ] ;
            condition = [ sequence.transform utility.ungrist : $(condition:G) ] $(cond) ;
            local value = [ utility.ungrist $(s[2]:G) ] ;
            result += <relevant>$(value):<relevant>$(condition) ;
        }
    }
    return [ sequence.unique $(result) ] ;
}


rule expand-subfeatures-in-conditions ( properties * )
{
    local result ;
    for local p in $(properties)
    {
        local s = [ MATCH "^(.*):(<.*)" : $(p) ] ;
        if ! $(s)
        {
            result += $(p) ;
        }
        else
        {
            local condition = $(s[1]) ;
            local value     = $(s[2]) ;
            # Condition might include several elements.
            condition = [ regex.split $(condition) "," ] ;
            local e ;
            for local c in $(condition)
            {
                # It is common for a condition to include a toolset or
                # subfeatures that have not been defined. In that case we want
                # the condition to simply 'never be satisfied' and validation
                # would only produce a spurious error so we prevent it by
                # passing 'true' as the second parameter.
                e += [ feature.expand-subfeatures $(c) : true ] ;
            }
            if $(e) = $(condition)
            {
                # (todo)
                #   This is just an optimization and possibly a premature one at
                # that.
                #                             (todo) (12.07.2008.) (Jurko)
                result += $(p) ;
            }
            else
            {
                result += "$(e:J=,):$(value)" ;
            }
        }
    }
    return $(result) ;
}


# Helper for as-path, below. Orders properties with the implicit ones first, and
# within the two sections in alphabetical order of feature name.
#
local rule path-order ( x y )
{
    if $(y:G) && ! $(x:G)
    {
        return true ;
    }
    else if $(x:G) && ! $(y:G)
    {
        return ;
    }
    else
    {
        if ! $(x:G)
        {
            x = [ feature.expand-subfeatures $(x) ] ;
            y = [ feature.expand-subfeatures $(y) ] ;
        }

        if $(x[1]) < $(y[1])
        {
            return true ;
        }
    }
}


local rule abbreviate-dashed ( string )
{
    local r ;
    for local part in [ regex.split $(string) - ]
    {
        r += [ string.abbreviate $(part) ] ;
    }
    return $(r:J=-) ;
}


local rule identity ( string )
{
    return $(string) ;
}


if --abbreviate-paths in [ modules.peek : ARGV ]
{
    .abbrev = abbreviate-dashed ;
}
else
{
    .abbrev = identity ;
}


# Returns a path representing the given expanded property set.
#
rule as-path ( properties * )
{
    local entry = .result.$(properties:J=-) ;

    if ! $($(entry))
    {
        # Trim redundancy.
        properties = [ feature.minimize $(properties) ] ;

        # Sort according to path-order.
        properties = [ sequence.insertion-sort $(properties) : path-order ] ;

        local components ;
        for local p in $(properties)
        {
            if ! hidden in [ feature.attributes $(p:G) ]
            {
                if $(p:G)
                {
                    local f = [ utility.ungrist $(p:G) ] ;
                    p = $(f)-$(p:G=) ;
                 }
                 components += [ $(.abbrev) $(p) ] ;
            }
        }

        $(entry) = $(components:J=/) ;
    }

    return $($(entry)) ;
}


# Exit with error if property is not valid.
#
local rule validate1 ( property )
{
    local msg ;
    if $(property:G)
    {
        local feature = $(property:G) ;
        local value = $(property:G=) ;

        if ! [ feature.valid $(feature) ]
        {
            # Ungrist for better error messages.
            feature = [ utility.ungrist $(property:G) ] ;
            msg = "unknown feature '$(feature)'" ;
        }
        else if $(value) && ! free in [ feature.attributes $(feature) ]
        {
            feature.validate-value-string $(feature) $(value) ;
        }
        else if ! ( $(value) || ( optional in [ feature.attributes $(feature) ] ) )
        {
            # Ungrist for better error messages.
            feature = [ utility.ungrist $(property:G) ] ;
            msg = "No value specified for feature '$(feature)'" ;
        }
    }
    else
    {
        local feature = [ feature.implied-feature $(property) ] ;
        feature.validate-value-string $(feature) $(property) ;
    }
    if $(msg)
    {
        import errors ;
        errors.error "Invalid property "'$(property:J=" ")'": "$(msg:J=" "). ;
    }
}


rule validate ( properties * )
{
    for local p in $(properties)
    {
        validate1 $(p) ;
    }
}


rule validate-property-sets ( property-sets * )
{
    for local s in $(property-sets)
    {
        validate [ feature.split $(s) ] ;
    }
}


# Expands any implicit property values in the given property 'specification' so
# they explicitly state their feature.
#
rule make ( specification * )
{
    local result ;
    for local e in $(specification)
    {
        if $(e:G)
        {
            result += $(e) ;
        }
        else if [ feature.is-implicit-value $(e) ]
        {
            local feature = [ feature.implied-feature $(e) ] ;
            result += $(feature)$(e) ;
        }
        else
        {
            import errors ;
            errors.error "'$(e)' is not a valid property specification" ;
        }
    }
    return $(result) ;
}


# Returns a property set containing all the elements in 'properties' that do not
# have their attributes listed in 'attributes'.
#
rule remove ( attributes + : properties * )
{
    local result ;
    for local e in $(properties)
    {
        if ! [ set.intersection $(attributes) : [ feature.attributes $(e:G) ] ]
        {
            result += $(e) ;
        }
    }
    return $(result) ;
}


# Returns a property set containing all the elements in 'properties' that have
# their attributes listed in 'attributes'.
#
rule take ( attributes + : properties * )
{
    local result ;
    for local e in $(properties)
    {
        if [ set.intersection $(attributes) : [ feature.attributes $(e:G) ] ]
        {
            result += $(e) ;
        }
    }
    return $(result) ;
}


# Selects properties corresponding to any of the given features.
#
rule select ( features * : properties * )
{
    local result ;

    # Add any missing angle brackets.
    local empty = "" ;
    features = $(empty:G=$(features)) ;

    for local p in $(properties)
    {
        if $(p:G) in $(features)
        {
            result += $(p) ;
        }
    }
    return $(result) ;
}


# Returns a modified version of properties with all values of the given feature
# replaced by the given value. If 'value' is empty the feature will be removed.
#
rule change ( properties * : feature value ? )
{
    local result ;
    for local p in $(properties)
    {
        if $(p:G) = $(feature)
        {
            result += $(value:G=$(feature)) ;
        }
        else
        {
            result += $(p) ;
        }
    }
    return $(result) ;
}


# If 'property' is a conditional property, returns the condition and the
# property. E.g. <variant>debug,<toolset>gcc:<inlining>full will become
# <variant>debug,<toolset>gcc <inlining>full. Otherwise, returns an empty
# string.
#
rule split-conditional ( property )
{
    return [ MATCH "^(.+):(<.+)" : $(property) ] ;
}


rule translate-path-value ( value : path )
{
    local t ;
    for local v in [ regex.split $(value) "&&" ]
    {
        t += [ path.root [ path.make $(v) ] $(path) ] ;
    }
    return $(t:TJ="&&") ;
}

rule translate-dependency-value ( value : project-id : project-location )
{
    local split-target = [ regex.match ^(.*)//(.*) : $(value) ] ;
    if $(split-target)
    {
        local rooted = [ path.root [ path.make $(split-target[1]) ]
                [ path.root $(project-location) [ path.pwd ] ] ] ;
        return $(rooted)//$(split-target[2]) ;
    }
    else if [ path.is-rooted $(value) ]
    {
        return $(value) ;
    }
    else
    {
        return $(project-id)//$(value) ;
    }
}

rule translate-indirect-value ( rulename : context-module )
{
    if [ MATCH "^([^%]*)%([^%]+)$" : $(rulename) ]
    {
        # Rule is already in the 'indirect-rule' format.
        return @$(rulename) ;
    }
    else
    {
        local v ;
        if ! [ MATCH "([.])" : $(rulename) ]
        {
            # This is an unqualified rule name. The user might want to
            # set flags on this rule name and toolset.flag
            # auto-qualifies it. Need to do the same here so flag
            # setting works. We can arrange for toolset.flag to *not*
            # auto-qualify the argument but then two rules defined in
            # two Jamfiles would conflict.
            rulename = $(context-module).$(rulename) ;
        }
        v = [ indirect.make $(rulename) : $(context-module) ] ;
        return @$(v) ;
    }

}

# Equivalent to a calling all of:
#   translate-path
#   translate-indirect
#   translate-dependency
#   expand-subfeatures-in-conditions
#   make
#
rule translate ( properties * : project-id : project-location : context-module )
{
    local result ;
    for local p in $(properties)
    {
        local split = [ split-conditional $(p) ] ;
        local condition property ;

        if $(split)
        {
            condition = $(split[1]) ;
            property = $(split[2]) ;

            local e ;
            for local c in [ regex.split $(condition) "," ]
            {
                e += [ feature.expand-subfeatures $(c) : true ] ;
            }

            condition = "$(e:J=,):" ;
        }
        else
        {
            property = $(p) ;
        }

        local feature = $(property:G) ;
        if ! $(feature)
        {
            if [ feature.is-implicit-value $(property) ]
            {
                feature = [ feature.implied-feature $(property) ] ;
                result += $(condition:E=)$(feature)$(property) ;
            }
            else
            {
                import errors ;
                errors.error "'$(property)' is not a valid property specification" ;
            }
        } else {
            local attributes = [ feature.attributes $(feature) ] ;
            local value ;
            # Only free features should be translated
            if free in $(attributes)
            {
                if path in $(attributes)
                {
                    value = [ translate-path-value $(property:G=) : $(project-location) ] ;
                    result += $(condition:E=)$(feature)$(value) ;
                }
                else if dependency in $(attributes)
                {
                    value = [ translate-dependency-value $(property:G=) : $(project-id) : $(project-location) ] ;
                    result += $(condition:E=)$(feature)$(value) ;
                }
                else
                {
                    local m = [ MATCH ^@(.+) : $(property:G=) ] ;
                    if $(m)
                    {
                        value = [ translate-indirect-value $(m) : $(context-module) ] ;
                        result += $(condition:E=)$(feature)$(value) ;
                    }
                    else
                    {
                        result += $(condition:E=)$(property) ;
                    }
                }
            }
            else
            {
                result += $(condition:E=)$(property) ;
            }
        }
    }
    return $(result) ;
}

# Interpret all path properties in 'properties' as relative to 'path'. The
# property values are assumed to be in system-specific form, and will be
# translated into normalized form.
#
rule translate-paths ( properties * : path )
{
    local result ;
    for local p in $(properties)
    {
        local split = [ split-conditional $(p) ] ;
        local condition = "" ;
        if $(split)
        {
            condition = "$(split[1]):" ;
            p = $(split[2]) ;
        }

        if path in [ feature.attributes $(p:G) ]
        {
            local values = [ regex.split $(p:TG=) "&&" ] ;
            local t ;
            for local v in $(values)
            {
                t += [ path.root [ path.make $(v) ] $(path) ] ;
            }
            t = $(t:J="&&") ;
            result += $(condition)$(t:TG=$(p:G)) ;
        }
        else
        {
            result += $(condition)$(p) ;
        }
    }
    return $(result) ;
}


# Assumes that all feature values that start with '@' are names of rules, used
# in 'context-module'. Such rules can be either local to the module or global.
# Converts such values into 'indirect-rule' format (see indirect.jam), so they
# can be called from other modules. Does nothing for such values that are
# already in the 'indirect-rule' format.
#
rule translate-indirect ( specification * : context-module )
{
    local result ;
    for local p in $(specification)
    {
        local m = [ MATCH ^@(.+) : $(p:G=) ] ;
        if $(m)
        {
            local v ;
            if [ MATCH "^([^%]*)%([^%]+)$" : $(m) ]
            {
                # Rule is already in the 'indirect-rule' format.
                v = $(m) ;
            }
            else
            {
                if ! [ MATCH "([.])" : $(m) ]
                {
                    # This is an unqualified rule name. The user might want to
                    # set flags on this rule name and toolset.flag
                    # auto-qualifies it. Need to do the same here so flag
                    # setting works. We can arrange for toolset.flag to *not*
                    # auto-qualify the argument but then two rules defined in
                    # two Jamfiles would conflict.
                    m = $(context-module).$(m) ;
                }
                v = [ indirect.make $(m) : $(context-module) ] ;
            }

            v = @$(v) ;
            result += $(v:G=$(p:G)) ;
        }
        else
        {
            result += $(p) ;
        }
    }
    return $(result) ;
}


# Binds all dependency properties in a list relative to the given project.
# Targets with absolute paths will be left unchanged and targets which have a
# project specified will have the path to the project interpreted relative to
# the specified location.
#
rule translate-dependencies ( specification * : project-id : location )
{
    local result ;
    for local p in $(specification)
    {
        local split = [ split-conditional $(p) ] ;
        local condition = "" ;
        if $(split)
        {
            condition = "$(split[1]):" ;
            p = $(split[2]) ;
        }
        if dependency in [ feature.attributes $(p:G) ]
        {
            local split-target = [ regex.match ^(.*)//(.*) : $(p:G=) ] ;
            if $(split-target)
            {
                local rooted = [ path.root [ path.make $(split-target[1]) ]
                     [ path.root $(location) [ path.pwd ] ] ] ;
                result += $(condition)$(p:G)$(rooted)//$(split-target[2]) ;
            }
            else if [ path.is-rooted $(p:G=) ]
            {
                result += $(condition)$(p) ;
            }
            else
            {
                result += $(condition)$(p:G)$(project-id)//$(p:G=) ;
            }
        }
        else
        {
            result += $(condition)$(p) ;
        }
    }
    return $(result) ;
}


# Class maintaining a property set -> string mapping.
#
class property-map
{
    import numbers ;
    import sequence ;

    rule __init__ ( )
    {
        self.next-flag = 1 ;
    }

    # Associate 'value' with 'properties'.
    #
    rule insert ( properties * : value )
    {
        self.all-flags += self.$(self.next-flag) ;
        self.$(self.next-flag) = $(value) $(properties) ;

        self.next-flag = [ numbers.increment $(self.next-flag) ] ;
    }

    # Returns the value associated with 'properties' or any subset of it. If
    # more than one subset has a value assigned to it, returns the value for the
    # longest subset, if it is unique.
    #
    rule find ( property-set )
    {
        # First find all matches.
        local matches ;
        local match-ranks ;
        for local i in $(self.all-flags)
        {
            local list = $($(i)) ;
            if [ $(property-set).contains-raw $(list[2-]) ]
            {
                matches += $(list[1]) ;
                match-ranks += [ sequence.length $(list) ] ;
            }
        }
        local best = [ sequence.select-highest-ranked $(matches)
            : $(match-ranks) ] ;
        if $(best[2])
        {
            import errors : error : errors.error ;
            errors.error "Ambiguous key $(properties:J= :E=)" ;
        }
        return $(best) ;
    }

    # Returns the value associated with 'properties'. If 'value' parameter is
    # given, replaces the found value.
    #
    rule find-replace ( properties * : value ? )
    {
        # First find all matches.
        local matches ;
        local match-ranks ;
        for local i in $(self.all-flags)
        {
            if $($(i)[2-]) in $(properties)
            {
                matches += $(i) ;
                match-ranks += [ sequence.length $($(i)) ] ;
            }
        }
        local best = [ sequence.select-highest-ranked $(matches)
            : $(match-ranks) ] ;
        if $(best[2])
        {
            import errors : error : errors.error ;
            errors.error "Ambiguous key $(properties:J= :E=)" ;
        }
        local original = $($(best)[1]) ;
        if $(value)-is-set
        {
            $(best) = $(value) $($(best)[2-]) ;
        }
        return $(original) ;
    }
}


rule __test__ ( )
{
    import assert ;
    import "class" : new ;
    import errors : try catch ;
    import feature ;

    # Local rules must be explicitly re-imported.
    import property : path-order abbreviate-dashed ;

    feature.prepare-test property-test-temp ;

    feature.feature toolset : gcc : implicit symmetric ;
    feature.subfeature toolset gcc : version : 2.95.2 2.95.3 2.95.4 3.0 3.0.1
        3.0.2 : optional ;
    feature.feature define : : free ;
    feature.feature runtime-link : dynamic static : symmetric link-incompatible ;
    feature.feature optimization : on off ;
    feature.feature variant : debug release : implicit composite symmetric ;
    feature.feature rtti : on off : link-incompatible ;

    feature.compose <variant>debug : <define>_DEBUG <optimization>off ;
    feature.compose <variant>release : <define>NDEBUG <optimization>on ;

    validate <toolset>gcc <toolset>gcc-3.0.1 : $(test-space) ;

    assert.true  path-order $(test-space) debug <define>foo ;
    assert.false path-order $(test-space) <define>foo debug ;
    assert.true  path-order $(test-space) gcc debug ;
    assert.false path-order $(test-space) debug gcc ;
    assert.true  path-order $(test-space) <optimization>on <rtti>on ;
    assert.false path-order $(test-space) <rtti>on <optimization>on ;

    assert.result-set-equal <toolset>gcc <rtti>off <define>FOO
        : refine <toolset>gcc <rtti>off
        : <define>FOO
        : $(test-space) ;

    assert.result-set-equal <toolset>gcc <optimization>on
        : refine <toolset>gcc <optimization>off
        : <optimization>on
        : $(test-space) ;

    assert.result-set-equal <toolset>gcc <rtti>off
        : refine <toolset>gcc : <rtti>off : $(test-space) ;

    assert.result-set-equal <toolset>gcc <rtti>off <rtti>off:<define>FOO
        : refine <toolset>gcc : <rtti>off <rtti>off:<define>FOO
        : $(test-space) ;

    assert.result-set-equal <toolset>gcc:<define>foo <toolset>gcc:<define>bar
        : refine <toolset>gcc:<define>foo : <toolset>gcc:<define>bar
        : $(test-space) ;

    assert.result <define>MY_RELEASE
        : evaluate-conditionals-in-context
          <variant>release,<rtti>off:<define>MY_RELEASE
        : <toolset>gcc <variant>release <rtti>off ;

    assert.result debug
        : as-path <optimization>off <variant>debug
        : $(test-space) ;

    assert.result gcc/debug/rtti-off
        : as-path <toolset>gcc <optimization>off <rtti>off <variant>debug
        : $(test-space) ;

    assert.result optmz-off : abbreviate-dashed optimization-off ;
    assert.result rntm-lnk-sttc : abbreviate-dashed runtime-link-static ;

    try ;
        validate <feature>value : $(test-space) ;
    catch "Invalid property '<feature>value': unknown feature 'feature'." ;

    try ;
        validate <rtti>default : $(test-space) ;
    catch \"default\" is not a known value of feature <rtti> ;

    validate <define>WHATEVER : $(test-space) ;

    try ;
        validate <rtti> : $(test-space) ;
    catch "Invalid property '<rtti>': No value specified for feature 'rtti'." ;

    try ;
        validate value : $(test-space) ;
    catch \"value\" is not an implicit feature value ;

    assert.result-set-equal <rtti>on
        : remove free implicit : <toolset>gcc <define>foo <rtti>on : $(test-space) ;

    assert.result-set-equal <include>a
        : select include : <include>a <toolset>gcc ;

    assert.result-set-equal <include>a
        : select include bar : <include>a <toolset>gcc ;

    assert.result-set-equal <include>a <toolset>gcc
        : select include <bar> <toolset> : <include>a <toolset>gcc ;

    assert.result-set-equal <toolset>kylix <include>a
        : change <toolset>gcc <include>a : <toolset> kylix ;

    pm = [ new property-map ] ;
    $(pm).insert <toolset>gcc : o ;
    $(pm).insert <toolset>gcc <os>NT : obj ;
    $(pm).insert <toolset>gcc <os>CYGWIN : obj ;

    assert.equal o : [ $(pm).find-replace <toolset>gcc ] ;

    assert.equal obj : [ $(pm).find-replace <toolset>gcc <os>NT ] ;

    try ;
        $(pm).find-replace <toolset>gcc <os>NT <os>CYGWIN ;
    catch "Ambiguous key <toolset>gcc <os>NT <os>CYGWIN" ;

    # Test ordinary properties.
    assert.result : split-conditional <toolset>gcc ;

    # Test properties with ":".
    assert.result : split-conditional <define>"FOO=A::B" ;

    # Test conditional feature.
    assert.result-set-equal <toolset>gcc,<toolset-gcc:version>3.0 <define>FOO
        : split-conditional <toolset>gcc,<toolset-gcc:version>3.0:<define>FOO ;

    feature.finish-test property-test-temp ;
}