class StructureButcher

# File lib/structurebutcher.rb, line 22
def amputate(body, slot)
    keys = split_escape(slot)
    result = body
    while (key = keys.shift)
        result = result[key]
    end
    return result
end

# File lib/structurebutcher.rb, line 49
def amputate_file(body_file, slot, part_file, format)
    parser = StructureButcher::Parser.new
    body   = parser.load_structure(body_file, "yaml")

    butcher = StructureButcher.new
    part = butcher.amputate(body, slot)

    storer = StructureButcher::Storer.new
    storer.save_structure(part, part_file, format)
end

# File lib/structurebutcher.rb, line 31
def implantate(body, slot, part)
    keys = split_escape(slot)
    last_key = keys.pop
    area = body

    if not area
        area = Hash.new
    end

    while (key = keys.shift)
        if not area.has_key?(key)
            then area[key] = {}
        end
        area = area[key]
    end
    area[last_key] = part
end

# File lib/structurebutcher.rb, line 60
def implantate_file(body_file, slot, part_file, format)
    parser = StructureButcher::Parser.new
    body   = parser.load_structure(body_file, "yaml")
    part   = parser.load_structure(part_file, format)

    # make sure we work with hash
    # it does not make sense to work with anything else
    if not body.is_a?(Hash)
        body = Hash.new
    end

    butcher = StructureButcher.new
    part = butcher.implantate(body, slot, part)

    storer = StructureButcher::Storer.new

    storer.save_structure(body, body_file, "yaml")
end

# File lib/structurebutcher.rb, line 79
def implantate_struct_into_file(body_file, slot, part_struct)
    parser = StructureButcher::Parser.new
    body   = parser.load_structure(body_file, "yaml")

    # make sure we work with hash
    # it does not make sense to work with anything else
    if not body.is_a?(Hash)
        body = Hash.new
    end

    butcher = StructureButcher.new
    butcher.implantate(body, slot, part_struct)

    storer = StructureButcher::Storer.new
    storer.save_structure(body, body_file, "yaml")
end

# File lib/structurebutcher.rb, line 14
def split_escape(str)
    output = []
    str.scan(/(?>\\.|[^\\.])+/) do |chunk|
        output.push( chunk.gsub(/\\(.)/, '\1') )
    end
    return output
end