Class: Parser::Source::Buffer

Inherits:
Object
  • Object
show all
Defined in:
lib/parser/source/buffer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, first_line = 1) ⇒ Buffer

Returns a new instance of Buffer.



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# File 'lib/parser/source/buffer.rb', line 7

def initialize(name, first_line = 1)
  @name       = name
  @first_line = first_line
  @source     = nil
end

Instance Attribute Details

#first_line ⇒ Object (readonly)

Returns the value of attribute first_line.



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# File 'lib/parser/source/buffer.rb', line 5

def first_line
  @first_line
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/parser/source/buffer.rb', line 5

def name
  @name
end

Instance Method Details

#decompose_position(position) ⇒ Object 



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# File 'lib/parser/source/buffer.rb', line 33

def decompose_position(position)
  line       = line_for(position)
  line_begin = line_begin_positions[line]

  [ @first_line + line, position - line_begin ]
end

#read ⇒ Object 



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# File 'lib/parser/source/buffer.rb', line 13

def read
  self.source = File.read(@name)

  self
end

#source ⇒ Object 



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# File 'lib/parser/source/buffer.rb', line 19

def source
  if @source.nil?
    raise RuntimeError, 'Cannot extract source from uninitialized Source::Buffer'
  end

  @source
end

#source=(source) ⇒ Object 



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# File 'lib/parser/source/buffer.rb', line 27

def source=(source)
  @source = source.freeze

  freeze
end

#source_line(line) ⇒ Object 



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# File 'lib/parser/source/buffer.rb', line 40

def source_line(line)
  mapped_line = line - @first_line

  # Consider improving this naïve implementation.
  source_line = source.lines.drop(mapped_line).first

  # Line endings will be commonly present for all lines
  # except the last one. It does not make sense to keep them.
  if source_line.end_with? "\n"
    source_line.chomp
  else
    source_line
  end
end