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Define choice and sequence with define_parser method.

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Jakob Rath 2013-12-02 17:00:34 +01:00 • committed by Dan Hirsch
parent 5ea0b727d0
commit d3ff5f5b1e
1 changed files with 13 additions and 26 deletions
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39
src/bindings/ruby/lib/hammer/parser.rb
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@ -40,48 +40,35 @@ module Hammer
return parser
end
def self.sequence(*parsers)
args = parsers.flat_map { |p| [:pointer, p.h_parser] }
h_parser = Hammer::Internal.h_sequence(*args, :pointer, nil)
sub_parsers = parsers # store them so they don't get garbage-collected (probably not needed, though)
# TODO: Use (managed?) FFI struct instead of void pointers
parser = Hammer::Parser.new
parser.instance_variable_set :@h_parser, h_parser
parser.instance_variable_set :@sub_parsers, sub_parsers
return parser
end
def self.choice(*parsers)
args = parsers.flat_map { |p| [:pointer, p.h_parser] }
h_parser = Hammer::Internal.h_choice(*args, :pointer, nil)
sub_parsers = parsers # store them so they don't get garbage-collected (probably not needed, though)
# TODO: Use (managed?) FFI struct instead of void pointers
parser = Hammer::Parser.new
parser.instance_variable_set :@h_parser, h_parser
parser.instance_variable_set :@sub_parsers, sub_parsers
return parser
end
# Defines a parser constructor with the given name.
# Options:
# hammer_function: name of the hammer function to call (default: 'h_'+name)
# varargs: Whether the function is taking a variable number of arguments (default: false)
def self.define_parser(name, options = {})
hammer_function = options[:hammer_function] || ('h_' + name.to_s)
varargs = options[:varargs] || false
# Define a new class method
define_singleton_method name do |*parsers|
#args = parsers.map { |p| p.instance_variable_get :@h_parser }
h_parser = Hammer::Internal.send hammer_function, *parsers.map(&:h_parser)
if varargs
args = parsers.flat_map { |p| [:pointer, p.h_parser] }
args += [:pointer, nil]
else
args = parsers.map(&:h_parser)
end
h_parser = Hammer::Internal.send hammer_function, *args
parser = Hammer::Parser.new
parser.instance_variable_set :@h_parser, h_parser
parser.instance_variable_set :@sub_parsers, parsers # store sub parsers to prevent them from being garbage-collected
return parser
end
end
private_class_method :define_parser
define_parser :sequence, varargs: true
define_parser :choice, varargs: true
define_parser :int64
define_parser :int32
define_parser :int16