# 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 http://www.boost.org/LICENSE_1_0.txt)

import errors ;
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 error ;

    # All the 'requirements' elements should be present in the result. Record
    # them so that we can handle 'properties'.
    for local r in $(requirements)
    {
        # Do not consider conditional requirements.
        if ! [ MATCH (:) : $(r:G=) ]
        {
            # Note: cannot use a local variable here, so use an ugly name.
            __require__$(r:G) = $(r:G=) ;
        }
    }

    for local p in $(properties)
    {
        if [ MATCH (:) : $(p:G=) ]
        {
            # Do not modify conditional properties.
            result += $(p) ;
        }
        else if free in [ feature.attributes $(p:G) ]
        {
            # Do not modify free properties.
            result += $(p) ;
        }
        else
        {
            local required-value = $(__require__$(p:G)) ;
            if $(required-value)
            {
                if $(p:G=) != $(required-value)
                {
                    result += $(p:G)$(required-value) ;
                }
                else
                {
                    result += $(p) ;
                }
            }
            else
            {
                result += $(p) ;
            }
        }
    }

    # Unset our ugly map.
    for local r in $(requirements)
    {
        __require__$(r:G) = ;
    }

    if $(error)
    {
        return $(error) ;
    }
    else
    {
        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 ;
    for local p in $(properties)
    {
        if [ MATCH (:<) : $(p) ]
        {
            conditionals += $(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 c = [ regex.split $(s[1]) "," ] ;
        # Evaluate condition.
        if $(c) in $(context)
        {
            result += $(s[2]) ;
        }
    }
    return $(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 $(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 $(msg)
    {
        errors.error "Invalid property "'$(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
        {
            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 )
{
    local m = [ MATCH "(.+):<(.+)" : $(property) ] ;
    if $(m)
    {
        return $(m[1]) <$(m[2]) ;
    }
}


# 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 errors ;
    import numbers ;
    import sequence ;

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

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

        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 ( properties + )
    {
        return [ find-replace $(properties) ] ;
    }

    # 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 $(self.properties.$(i)) in $(properties)
            {
                matches += $(i) ;
                match-ranks += [ sequence.length $(self.properties.$(i)) ] ;
            }
        }
        local best = [ sequence.select-highest-ranked $(matches)
            : $(match-ranks) ] ;
        if $(best[2])
        {            
            errors.error "Ambiguous key $(properties:J= :E=)" ;
        }
        local original = $(self.value.$(best)) ;
        if $(value)
        {
            self.value.$(best) = $(value) ;
        }
        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 a value of an implicit feature ;

    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 <toolset>gcc ] ;

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

    try ;
        $(pm).find <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 ;
}