Class: Rack::Lint::InputWrapper

Inherits:
Object
  • Object
show all
Includes:
Assertion
Defined in:
lib/rack/lint.rb

Instance Method Summary collapse

Methods included from Assertion

#assert

Constructor Details

#initialize(input) ⇒ InputWrapper

Returns a new instance of InputWrapper.



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# File 'lib/rack/lint.rb', line 357

def initialize(input)
  @input = input
end

Instance Method Details

#close(*args) ⇒ Object

  • close must never be called on the input stream.



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# File 'lib/rack/lint.rb', line 450

def close(*args)
  assert("rack.input#close must not be called") { false }
end

#each(*args) ⇒ Object

  • each must be called without arguments and only yield Strings.



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# File 'lib/rack/lint.rb', line 422

def each(*args)
  assert("rack.input#each called with arguments") { args.size == 0 }
  @input.each { |line|
    assert("rack.input#each didn't yield a String") {
      line.kind_of? String
    }
    yield line
  }
end

#gets(*args) ⇒ Object

  • gets must be called without arguments and return a string, or nil on EOF.



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# File 'lib/rack/lint.rb', line 363

def gets(*args)
  assert("rack.input#gets called with arguments") { args.size == 0 }
  v = @input.gets
  assert("rack.input#gets didn't return a String") {
    v.nil? or v.kind_of? String
  }
  v
end

#read(*args) ⇒ Object

  • read behaves like IO#read. Its signature is read([length, [buffer]]).

    If given, length must be a non-negative Integer (>= 0) or nil, and buffer must be a String and may not be nil.

    If length is given and not nil, then this method reads at most length bytes from the input stream.

    If length is not given or nil, then this method reads all data until EOF.

    When EOF is reached, this method returns nil if length is given and not nil, or “” if length is not given or is nil.

    If buffer is given, then the read data will be placed into buffer instead of a newly created String object.



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# File 'lib/rack/lint.rb', line 389

def read(*args)
  assert("rack.input#read called with too many arguments") {
    args.size <= 2
  }
  if args.size >= 1
    assert("rack.input#read called with non-integer and non-nil length") {
      args.first.kind_of?(Integer) || args.first.nil?
    }
    assert("rack.input#read called with a negative length") {
      args.first.nil? || args.first >= 0
    }
  end
  if args.size >= 2
    assert("rack.input#read called with non-String buffer") {
      args[1].kind_of?(String)
    }
  end

  v = @input.read(*args)

  assert("rack.input#read didn't return nil or a String") {
    v.nil? or v.kind_of? String
  }
  if args[0].nil?
    assert("rack.input#read(nil) returned nil on EOF") {
      !v.nil?
    }
  end

  v
end

#rewind(*args) ⇒ Object

  • rewind must be called without arguments. It rewinds the input stream back to the beginning. It must not raise Errno::ESPIPE: that is, it may not be a pipe or a socket. Therefore, handler developers must buffer the input data into some rewindable object if the underlying input stream is not rewindable.



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# File 'lib/rack/lint.rb', line 437

def rewind(*args)
  assert("rack.input#rewind called with arguments") { args.size == 0 }
  assert("rack.input#rewind raised Errno::ESPIPE") {
    begin
      @input.rewind
      true
    rescue Errno::ESPIPE
      false
    end
  }
end