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# -----------------------------------------------------------------------------
#
# Versionomy conversion base class
#
# -----------------------------------------------------------------------------
# Copyright 2008 Daniel Azuma
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# * 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.
# * Neither the name of the copyright holder, nor the names of any other
# contributors to this software, may be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT OWNER OR 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.
# -----------------------------------------------------------------------------
;
module Versionomy
module Conversion
# The base conversion class.
#
# This base class defines the API for a conversion. All conversions must
# define the method <tt>convert_value</tt> documented here. Conversions
# need not actually extend this base class, as long as they duck-type
# this method. However, this base class does provide a few convenience
# methods such as a sane implementation of inspect.
class Base
# Create a conversion using a simple DSL.
# You can pass a block to the initializer that takes the same
# parameters as convert_value, and the conversion will use that block
# to perform the conversion.
def initialize(&block_)
@_converter = block_
end
# Convert the given value to the given format and return the converted
# value.
#
# The convert_params may be interpreted however the particular
# conversion wishes.
#
# Raises Versionomy::Errors::ConversionError if the conversion failed.
def convert_value(value_, format_, convert_params_=nil)
if @_converter
@_converter.call(value_, format_, convert_params_)
else
raise Errors::ConversionError, "Conversion not implemented"
end
end
# Inspect this conversion.
def inspect
"#<#{self.class}:0x#{object_id.to_s(16)}>"
end
# The default to_s implementation just calls inspect.
def to_s
inspect
end
end
end
end
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