feature.jam

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#
# Requires: for every subproperty, there is a parent property.  All
# features are explicitly expressed.
#
# This rule probably shouldn't be needed, but
# build-request.expand-no-defaults is being abused for unintended
# purposes and it needs help
rule compress-subproperties ( properties * )
{
    local all-subs matched-subs result ;
    
    for local p in $(properties)
    {
        if ! $(p:G)
        {
            assert.nonempty-variable p:G ; # expecting fully-gristed properties
        }
        
        
        if ! subfeature in $($(p:G).attributes)
        {
            local subs = [ 
              sequence.insertion-sort
                [ sequence.filter is-subproperty-of $(p) : $(properties) ]
            ] ;
            
            matched-subs += $(subs) ;

            local subvalues = -$(subs:G=:J=-) ;
            subvalues ?= "" ;
            result += $(p)$(subvalues) ;
        }
        else
        {
            all-subs += $(p) ;
        }
    }
    assert.result true : set.equal $(all-subs) : $(matched-subs) ;
    return $(result) ;
}
  
# given an ungristed string, finds the longest prefix which is a
# top-level feature name followed by a dash, and return a pair
# consisting of the parts before and after that dash.  More
# interesting than a simple split because feature names can contain
# dashes.
local rule split-top-feature ( feature-plus )
{
    local e = [ regex.split $(feature-plus) - ] ;
    local f = $(e[1]) ;
    
    local v ;
    while $(e)
    {
        if <$(f)> in $(.all-top-features)
        {
            v = $(f) $(e[2-]:J=-) ;
        }
        e = $(e[2-]) ;
        f = $(f)-$(e[1]) ;
    }
    return $(v) ;
}
  
# Given a set of properties, add default values for features not
# represented in the set. 
# Note: if there's there's ordinary feature F1 and composite feature
# F2, which includes some value for F1, and both feature have default values,
# then the default value of F1 will be added, not the value in F2. This might
# not be right idea: consider
#
#   feature variant : debug ... ;
#        <variant>debug : .... <runtime-debugging>on
#   feature <runtime-debugging> : off on ;
#   
#   Here, when adding default for an empty property set, we'll get
#
#     <variant>debug <runtime_debugging>off
#  
#   and that's kind of strange.
rule add-defaults ( properties * )
{
    for local v in $(properties:G=)
    {
        if $(v) in $(properties)
        {
            error add-defaults requires explicitly specified features,
                but \"$(v)\" appears to be the value of an un-expanded implicit feature ;
        }
    }
    # We don't add default for elements with ":" inside. This catches:
    # 1. Conditional properties --- we don't want <variant>debug:<define>DEBUG
    #    to be takes as specified value for <variant>
    # 2. Free properties with ":" in values. We don't care, since free properties
    #    don't have defaults.
    local xproperties = [ MATCH "^([^:]+)$" : $(properties) ] ;
    local missing-top = [ set.difference $(.all-top-features) : $(xproperties:G) ] ;
    local more =  [ defaults $(missing-top) ] ;
    properties += $(more) ;
    xproperties += $(more) ;
    
    # Add defaults for subfeatures of features which are present
    for local p in $(xproperties)
    {
        local s = $($(p:G).subfeatures) ;
        local f = [ utility.ungrist $(p:G) ] ;
        local missing-subs = [ set.difference <$(f)-$(s)> : $(properties:G) ] ;
        properties += [ defaults [ select-subfeatures $(p) : $(missing-subs) ] ] ;
    }
    
    return $(properties)  ;
}

# Given a property-set of the form
#       v1/v2/...vN-1/<fN>vN/<fN+1>vN+1/...<fM>vM
#
# Returns
#       v1 v2 ... vN-1 <fN>vN <fN+1>vN+1 ... <fM>vM
#
# Note that vN...vM may contain slashes. This is resilient to the
# substitution of backslashes for slashes, since Jam, unbidden,
# sometimes swaps slash direction on NT.
rule split ( property-set )
{
    local pieces = [ regex.split $(property-set) [\\/] ] ;
    local result ;

    for local x in $(pieces)
    {
        if ( ! $(x:G) ) && $(result[-1]:G)
        {
            result = $(result[1--2]) $(result[-1])/$(x) ;
        }
        else
        {
            result += $(x) ;
        }
    }

    return $(result) ;
}

# Appends a rule to the list of rules assigned to the given feature or property.
# That rules will be used in extending property sets by the 'run-actions' rule. 
# The rule should accept two arguments:
# - the property which is registered
# - the list of all properties 
# and return a set of additional 
# properties to be added. Property should be specified in the usual way:
# <feature>value, and feature should be specified as <feature>.
rule action ( property-or-feature : rule-name )
{
    .rules.$(property-or-feature) += [ indirect.make-qualified $(rule-name) ] ;
}

# Returns 'properties' augmented with results of calling rule associated with properties.
# If both a property and its feature have rules, only rules for the property are executed.
rule run-actions ( properties * )
{
    local added = ;
    for local e in $(properties)
    {
        local rules ;
        if $(.rules.$(e)) 
        {
            rules = $(.rules.$(e)) ;
        }
        else if $(.rules.$(e:G)) 
        {
            rules = $(.rules.$(e:G)) ;
        }
        for local r in $(rules)
        {
            added += [ indirect.call $(r) $(e) : $(properties) ] ;
        }
    }
    return $(properties) $(added) ;            
}

# tests of module feature
local rule __test__ ( )
{
    # use a fresh copy of the feature module
    prepare-test feature-test-temp ;

    # These are local rules and so must be explicitly reimported into
    # the testing module
    import feature : extend-feature validate-feature select-subfeatures ; 
    
    import errors : try catch ;
    import assert ;

    feature toolset : gcc : implicit ;
    feature define : : free ;
    feature runtime-link : dynamic static : symmetric ;
    feature optimization : on off ;
    feature variant : debug release : implicit composite symmetric ;
    feature stdlib : native stlport ;
    feature magic : : free ;

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

    extend-feature toolset : msvc metrowerks ;
    subfeature toolset gcc : version : 2.95.2 2.95.3 2.95.4
      3.0 3.0.1 3.0.2 : optional ;

    local rule handle-stlport ( property : properties * )
    {
        return <include>/path/to/stlport ;
    }

    local rule handle-magic ( property : properties * )
    {
        return <define>MAGIC=$(property:G=) ;
    }

    local rule handle-magic2 ( property : properties * )
    {
        return <define>MAGIC=BIG_MAGIC ;
    }

    local rule handle-magic3 ( property : properties * )
    {
        return <define>MAGIC=VERY_BIG_MAGIC ;
    }

    action <stdlib>stlport : handle-stlport ;
    action <magic> : handle-magic ;
    action <magic>17 : handle-magic2 ;
    action <magic>17 : handle-magic3 ;

    assert.result <toolset-gcc:version>
      : select-subfeatures <toolset>gcc
         : <toolset-gcc:version>
           <toolset-msvc:version>
           <toolset-version>
           <stdlib>
      ;
           
    subfeature stdlib : version : 3 4 : optional ;

    assert.result <stdlib-version>
      : select-subfeatures <stdlib>native
         : <toolset-gcc:version>
           <toolset-msvc:version>
           <toolset-version>
           <stdlib-version>
      ;
           
    assert.result <toolset>gcc <toolset-gcc:version>3.0.1
      : expand-subfeatures <toolset>gcc-3.0.1 ;

    assert.result <define>foo=x-y
      : expand-subfeatures <define>foo=x-y ;

    assert.result <toolset>gcc <toolset-gcc:version>3.0.1
      : expand-subfeatures gcc-3.0.1 ;

    feature dummy : dummy1 dummy2 ;
    subfeature dummy : subdummy : x y z : optional ;

    feature fu : fu1 fu2 : optional ;
    subfeature fu : subfu : x y z : optional ;
    subfeature fu : subfu2 : q r s ;
    
    assert.result a c e
      : get-values <x> : <x>a <y>b <x>c <y>d <x>e ;

    assert.result <toolset>gcc <toolset-gcc:version>3.0.1
      <variant>debug <define>_DEBUG <optimization>on
      : expand gcc-3.0.1 debug <optimization>on
      ;

    assert.result <fu>fu1 <fu-subfu2>q
      : expand-subfeatures <fu>fu1
      ;
    
    assert.result <variant>debug <define>_DEBUG <optimization>on
      : expand debug <optimization>on
      ;

    assert.result <optimization>on <variant>debug <define>_DEBUG 
      : expand <optimization>on debug 
      ;

    assert.result <runtime-link>dynamic <optimization>on
      : defaults <runtime-link> <define> <optimization>
      ;

    assert.result <runtime-link>static <define>foobar <optimization>on <toolset>gcc:<define>FOO
      <toolset>gcc <variant>debug <stdlib>native <dummy>dummy1

      : add-defaults <runtime-link>static <define>foobar
        <optimization>on <toolset>gcc:<define>FOO 
      ;
    
    assert.result <runtime-link>static <define>foobar <optimization>on <toolset>gcc:<define>FOO
      <fu>fu1 <toolset>gcc <variant>debug <stdlib>native <dummy>dummy1 <fu-subfu2>q

      : add-defaults <runtime-link>static <define>foobar
        <optimization>on <toolset>gcc:<define>FOO <fu>fu1
      ;
    
    set-default <runtime-link> : static ;
    assert.result <runtime-link>static 
      : defaults <runtime-link>
      ;
      

    assert.result  <toolset>gcc <define>foo <stdlib>stlport <magic>3 <include>/path/to/stlport <define>MAGIC=3
      : run-actions <toolset>gcc <define>foo <stdlib>stlport <magic>3
      ;

    assert.result <magic>17 <define>MAGIC=BIG_MAGIC <define>MAGIC=VERY_BIG_MAGIC
      : run-actions <magic>17 
      ;


    assert.result gcc-3.0.1 debug <optimization>on
      : minimize [ expand gcc-3.0.1 debug <optimization>on <stdlib>native ]
      ;

    assert.result gcc-3.0.1 debug <runtime-link>dynamic
      : minimize [ expand gcc-3.0.1 debug <optimization>off <runtime-link>dynamic ]
      ;

    assert.result gcc-3.0.1 debug
      : minimize [ expand gcc-3.0.1 debug <optimization>off ]
      ;

    assert.result debug <optimization>on
      : minimize [ expand debug <optimization>on ]
      ;

    assert.result gcc-3.0
      : minimize <toolset>gcc <toolset-gcc:version>3.0 
      ;

    assert.result gcc-3.0
      : minimize <toolset-gcc:version>3.0 <toolset>gcc
      ;

    assert.result <x>y/z <a>b/c <d>e/f
      : split <x>y/z/<a>b/c/<d>e/f
      ;

    assert.result <x>y/z <a>b/c <d>e/f
      : split <x>y\\z\\<a>b\\c\\<d>e\\f
      ;

    assert.result a b c <d>e/f/g <h>i/j/k
      : split a/b/c/<d>e/f/g/<h>i/j/k
      ;

    assert.result a b c <d>e/f/g <h>i/j/k
      : split a\\b\\c\\<d>e\\f\\g\\<h>i\\j\\k
      ;

    # test error checking

    try ;
    {
        expand release <optimization>off <optimization>on ;
    }
    catch explicitly-specified values of non-free feature <optimization> conflict ;

    try ;
    {
        validate-feature <foobar> ;
    }
    catch unknown feature ;

    validate-value-string <toolset> gcc ;
    validate-value-string <toolset> gcc-3.0.1 ;

    try ;
    {
        validate-value-string <toolset> digital_mars ;
    }
    catch \"digital_mars\" is not a known value of <toolset> ;

    try ;
    {
        feature foobar : : baz ;
    }
    catch unknown attributes: baz ;

    feature feature1 ;
    try ;
    {
        feature feature1 ;
    }
    catch feature already defined: ;

    try ;
    {
        feature feature2 : : free implicit ;
    }
    catch free features cannot also be implicit ;

    try ;
    {
        feature feature3 : : free propagated ;
    }
    catch free features cannot be propagated ;

    try ;
    {
        implied-feature lackluster ;
    }
    catch \"lackluster\" is not a value of an implicit feature ;

    try ;
    {
        implied-subfeature <toolset> 3.0.1 ;
    }
    catch \"3.0.1\" is not a known subfeature value of
      <toolset> ;

    try ;
    {
        implied-subfeature <toolset> not-a-version : gcc ;
    }
    catch \"not-a-version\" is not a known subfeature value of
      <toolset>gcc ;

    # leave a clean copy of the features module behind
    finish-test feature-test-temp ;
}