Class: YARP::LibRubyParser::YPBuffer

Inherits:
Object
  • Object
show all
Defined in:
lib/yarp/ffi.rb

Overview

This object represents a yp_buffer_t. We only use it as an opaque pointer, so it doesn’t need to know the fields of yp_buffer_t.

Constant Summary collapse

SIZEOF = 
LibRubyParser.yp_buffer_sizeof

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(pointer) ⇒ YPBuffer

Returns a new instance of YPBuffer.



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# File 'lib/yarp/ffi.rb', line 102

def initialize(pointer)
  @pointer = pointer
end

Instance Attribute Details

#pointer ⇒ Object (readonly)

Returns the value of attribute pointer.



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# File 'lib/yarp/ffi.rb', line 100

def pointer
  @pointer
end

Class Method Details

.with(&block) ⇒ Object

Initialize a new buffer and yield it to the block. The buffer will be automatically freed when the block returns.



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# File 'lib/yarp/ffi.rb', line 120

def self.with(&block)
  pointer = FFI::MemoryPointer.new(SIZEOF)

  begin
    raise unless LibRubyParser.yp_buffer_init(pointer)
    yield new(pointer)
  ensure
    LibRubyParser.yp_buffer_free(pointer)
    pointer.free
  end
end

Instance Method Details

#length ⇒ Object 



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# File 'lib/yarp/ffi.rb', line 110

def length
  LibRubyParser.yp_buffer_length(pointer)
end

#read ⇒ Object 



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# File 'lib/yarp/ffi.rb', line 114

def read
  value.read_string(length)
end

#value ⇒ Object 



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# File 'lib/yarp/ffi.rb', line 106

def value
  LibRubyParser.yp_buffer_value(pointer)
end