# Copyright (C) 2011 Apple Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
# THE POSSIBILITY OF SUCH DAMAGE.

require "config"
require "ast"

#
# node.resolveSettings(settings)
#
# Construct a new AST that does not have any IfThenElse nodes by
# substituting concrete boolean values for each Setting.
#

class Node
    def resolveSettings(settings)
        mapChildren {
            | child |
            child.resolveSettings(settings)
        }
    end
end

class True
    def resolveSettings(settings)
        self
    end
end

class False
    def resolveSettings(settings)
        self
    end
end

class Setting
    def resolveSettings(settings)
        settings[@name].asNode
    end
end

class And
    def resolveSettings(settings)
        (@left.resolveSettings(settings).value and @right.resolveSettings(settings).value).asNode
    end
end

class Or
    def resolveSettings(settings)
        (@left.resolveSettings(settings).value or @right.resolveSettings(settings).value).asNode
    end
end

class Not
    def resolveSettings(settings)
        (not @child.resolveSettings(settings).value).asNode
    end
end

class IfThenElse
    def resolveSettings(settings)
        if @predicate.resolveSettings(settings).value
            @thenCase.resolveSettings(settings)
        else
            @elseCase.resolveSettings(settings)
        end
    end
end

class Sequence
    def resolveSettings(settings)
        newList = []
        @list.each {
            | item |
            item = item.resolveSettings(settings)
            if item.is_a? Sequence
                newList.concat(item.list)
            else
                newList