/usr/lib/ruby/vendor_ruby/ffi/enum.rb is in ruby-ffi 1.9.10debian-1build2.
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# Copyright (C) 2009, 2010 Wayne Meissner
# Copyright (C) 2009 Luc Heinrich
#
# This file is part of ruby-ffi.
#
# 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 Ruby FFI project nor the names of its contributors
# 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 FFI
# An instance of this class permits to manage {Enum}s. In fact, Enums is a collection of {Enum}s.
class Enums
# @return [nil]
def initialize
@all_enums = Array.new
@tagged_enums = Hash.new
@symbol_map = Hash.new
end
# @param [Enum] enum
# Add an {Enum} to the collection.
def <<(enum)
@all_enums << enum
@tagged_enums[enum.tag] = enum unless enum.tag.nil?
@symbol_map.merge!(enum.symbol_map)
end
# @param query enum tag or part of an enum name
# @return [Enum]
# Find a {Enum} in collection.
def find(query)
if @tagged_enums.has_key?(query)
@tagged_enums[query]
else
@all_enums.detect { |enum| enum.symbols.include?(query) }
end
end
# @param symbol a symbol to find in merge symbol maps of all enums.
# @return a symbol
def __map_symbol(symbol)
@symbol_map[symbol]
end
end
# Represents a C enum.
#
# For a C enum:
# enum fruits {
# apple,
# banana,
# orange,
# pineapple
# };
# are defined this vocabulary:
# * a _symbol_ is a word from the enumeration (ie. _apple_, by example);
# * a _value_ is the value of a symbol in the enumeration (by example, apple has value _0_ and banana _1_).
class Enum
include DataConverter
attr_reader :tag
attr_reader :native_type
# @overload initialize(info, tag=nil)
# @param [nil, Enumerable] info
# @param [nil, Symbol] tag enum tag
# @overload initialize(native_type, info, tag=nil)
# @param [FFI::Type] native_type Native type for new Enum
# @param [nil, Enumerable] info symbols and values for new Enum
# @param [nil, Symbol] tag name of new Enum
def initialize(*args)
@native_type = args.first.kind_of?(FFI::Type) ? args.shift : Type::INT
info, @tag = *args
@kv_map = Hash.new
unless info.nil?
last_cst = nil
value = 0
info.each do |i|
case i
when Symbol
raise ArgumentError, "duplicate enum key" if @kv_map.has_key?(i)
@kv_map[i] = value
last_cst = i
value += 1
when Integer
@kv_map[last_cst] = i
value = i+1
end
end
end
@vk_map = @kv_map.invert
end
# @return [Array] enum symbol names
def symbols
@kv_map.keys
end
# Get a symbol or a value from the enum.
# @overload [](query)
# Get enum value from symbol.
# @param [Symbol] query
# @return [Integer]
# @overload [](query)
# Get enum symbol from value.
# @param [Integer] query
# @return [Symbol]
def [](query)
case query
when Symbol
@kv_map[query]
when Integer
@vk_map[query]
end
end
alias find []
# Get the symbol map.
# @return [Hash]
def symbol_map
@kv_map
end
alias to_h symbol_map
alias to_hash symbol_map
# @param [Symbol, Integer, #to_int] val
# @param ctx unused
# @return [Integer] value of a enum symbol
def to_native(val, ctx)
@kv_map[val] || if val.is_a?(Integer)
val
elsif val.respond_to?(:to_int)
val.to_int
else
raise ArgumentError, "invalid enum value, #{val.inspect}"
end
end
# @param val
# @return symbol name if it exists for +val+.
def from_native(val, ctx)
@vk_map[val] || val
end
end
end
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