Class: Kaiseki::Stream

Inherits:
Object show all
Defined in:
lib/stream.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(string) ⇒ Stream

Returns a new instance of Stream.



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# File 'lib/stream.rb', line 5

def initialize string
	if string.is_a? File
		@string = string.to_a.join
	else
		@string = string.to_s
	end
	@pos = 0
	@newlines = []
	index_lines
end

Instance Attribute Details

#pos ⇒ Object (readonly)

Returns the value of attribute pos.



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# File 'lib/stream.rb', line 3

def pos
  @pos
end

Instance Method Details

#column ⇒ Object 



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# File 'lib/stream.rb', line 81

def column
	@pos - @newlines[self.line][0]
end

#eof? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/stream.rb', line 25

def eof?
	@pos == @string.length
end

#getc ⇒ Object 



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# File 'lib/stream.rb', line 16

def getc
	if @pos < @string.length
		@pos += 1
		@string[@pos - 1]
	else
		nil
	end
end

#goto(pos) ⇒ Object 



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# File 'lib/stream.rb', line 39

def goto pos
	if pos < 0
		@pos = 0
	elsif pos > @string.length
		@pos = @string.length
	end
end

#length ⇒ Object Also known as: size 



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# File 'lib/stream.rb', line 71

def length
	@string.length
end

#line ⇒ Object 



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# File 'lib/stream.rb', line 77

def line
	bsearch @pos, 0, @newlines.length
end

#lock(&block) ⇒ Object 



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# File 'lib/stream.rb', line 47

def lock &block
	safe_pos = @pos
	begin
		catch :PredicateSuccess do
			return block.call
		end
		@pos = safe_pos
		throw :SkipSuccess
	rescue ParseError => e
		@pos = safe_pos
		e.line ||= self.line
		e.column ||= self.column
		raise e
	end
end

#match(regexp) ⇒ Object 



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# File 'lib/stream.rb', line 29

def match regexp
	match = @string[@pos..-1].match /\A#{regexp}/
	if match
		@pos += match.to_s.length
		match
	else
		nil
	end
end

#to_s ⇒ Object 



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# File 'lib/stream.rb', line 63

def to_s
	@string.dup
end

#to_stream ⇒ Object 



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# File 'lib/stream.rb', line 67

def to_stream
	self
end