Class: Stupidedi::Reader::DelegatedInput

Inherits:
AbstractInput show all
Defined in:
lib/stupidedi/reader/input/delegated_input.rb

Querying the Position collapse

Querying the Position collapse

Advancing the Cursor collapse

Instance Method Summary collapse

Methods inherited from AbstractInput

#index

Methods included from Inspect

#inspect

Constructor Details

#initialize(delegate, offset = 0, line = 1, column = 1) ⇒ DelegatedInput

Returns a new instance of DelegatedInput


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# File 'lib/stupidedi/reader/input/delegated_input.rb', line 9

def initialize(delegate, offset = 0, line = 1, column = 1)
  @delegate, @offset, @line, @column =
    delegate, offset, line, column
end

Instance Attribute Details

#column (readonly)

Returns the value of attribute column


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# File 'lib/stupidedi/reader/input/delegated_input.rb', line 24

def column
  @column
end

#line (readonly)

Returns the value of attribute line


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# File 'lib/stupidedi/reader/input/delegated_input.rb', line 21

def line
  @line
end

#offset (readonly)

Returns the value of attribute offset


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# File 'lib/stupidedi/reader/input/delegated_input.rb', line 18

def offset
  @offset
end

Instance Method Details

#drop(n) ⇒ AbstractInput

Advance the cursor forward n elements

Parameters:

  • n (Integer)

    the number of elements to advance (n >= 0)

Returns:

Raises:

  • (ArgumentError)

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# File 'lib/stupidedi/reader/input/delegated_input.rb', line 49

def drop(n)
  raise ArgumentError, "n must be positive" unless n >= 0

  suffix = @delegate.drop(n)
  prefix = @delegate.take(n)

  length = prefix.length
  count  = prefix.count("\n")

  column = unless count.zero?
             length - prefix.rindex("\n")
           else
             @column + length
           end

  copy(:delegate => suffix,
       :offset   => @offset + length,
       :line     => @line + count,
       :column   => column)
end

#positionString

The file name, URI, etc that identifies the input stream

Returns:

  • (String)

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# File 'lib/stupidedi/reader/input/delegated_input.rb', line 27

def position
  Position.new(@offset, @line, @column, nil)
end

#pretty_print(q)

This method returns an undefined value.


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# File 'lib/stupidedi/reader/input/delegated_input.rb', line 87

def pretty_print(q)
  q.text("DelegateInput")
  q.group(2, "(", ")") do
    preview = @delegate.take(4)
    preview = if preview.empty?
                "EOF"
              elsif preview.length <= 3
                preview.inspect
              else
                (preview.take(3) + "...").inspect
              end

    q.text preview
    q.text " at line #{@line}, column #{@column}, offset #{@offset}"
  end
end