Class: Stupidedi::Reader::DelegatedInput

Inherits:

AbstractInput

• Object
• AbstractInput
• Stupidedi::Reader::DelegatedInput

show all

Defined in:

lib/stupidedi/reader/input/delegated_input.rb

Querying the Position (collapse)

• - (Integer) column readonly

  The column of the current position.

• - (Integer) line readonly

  The line of the current position.

• - (Integer) offset readonly

  The current position as the number of elements previously read.

Querying the Position (collapse)

• - (Position) position

  The Position value that describes the position of the input stream.

Advancing the Cursor (collapse)

• - (AbstractInput) drop(n)

  Advance the cursor forward n elements.

Instance Method Summary (collapse)

• - (DelegatedInput) initialize(delegate, offset = 0, line = 1, column = 1) constructor

  A new instance of DelegatedInput.

• - pretty_print(q)

Methods inherited from AbstractInput

#index, #path

Methods included from Inspect

#inspect

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# File 'lib/stupidedi/reader/input/delegated_input.rb', line 6

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

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

def column
  @column
end

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

def line
  @line
end

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# File 'lib/stupidedi/reader/input/delegated_input.rb', line 15

def offset
  @offset
end

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# File 'lib/stupidedi/reader/input/delegated_input.rb', line 44

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

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

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

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# File 'lib/stupidedi/reader/input/delegated_input.rb', line 81

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