Parslet::Source

# File lib/parslet/source.rb, line 10
def initialize(str)
  raise ArgumentError unless str.respond_to?(:to_str)

  @pos = 0
  @str = str
  
  @line_cache = LineCache.new
  @line_cache.scan_for_line_endings(0, @str)
end

# File lib/parslet/source.rb, line 46
def chars_left
  @str.size - @pos
end

# File lib/parslet/source.rb, line 33
def consume(n)
  slice_str = @str.slice(@pos, n)
  slice = Parslet::Slice.new(
    slice_str, 
    pos,
    @line_cache)
  
  @pos += slice_str.size
  return slice
end

# File lib/parslet/source.rb, line 50
def eof?
  @pos >= @str.size
end

# File lib/parslet/source.rb, line 62
def line_and_column(position=nil)
  @line_cache.line_and_column(position || self.pos)
end

# File lib/parslet/source.rb, line 25
def matches?(pattern)
  @str.index(pattern, @pos) == @pos
end