class Covered::Coverage

def self.for(path, code = nil, line_offset = 1)
	self.new(Source.new(path, code, line_offset))
end

def self.source(path, code = nil, line_offset = 1)
	Source.new(path, code, line_offset)
end

def [] lineno
	@counts[lineno]
end

def annotate(lineno, annotation)
	@annotations[lineno] ||= []
	@annotations[lineno] << annotation
end

def executable_count
	executable_lines.count
end

def executable_lines
	@executable_lines ||= @counts.compact
end

def executed_count
	executed_lines.count
end

def executed_lines
	@executed_lines ||= executable_lines.reject(&:zero?)
end

def freeze
	return self if frozen?
	
	@counts.freeze
	@annotations.freeze
	
	executable_lines
	executed_lines
	
	super
end

def initialize(source, counts = [])
	@source = source
	@counts = counts
	@total = 0
	
	@annotations = {}
	
	@executable_lines = nil
	@executed_lines = nil
end

def mark(lineno, value = 1)
	@total += value
	
	if @counts[lineno]
		@counts[lineno] += value
	else
		@counts[lineno] = value
	end
end

def missing_count
	executable_count - executed_count
end

def path
	@source.path
end

def print(output)
	output.puts "** #{executed_count}/#{executable_count} lines executed; #{percentage.to_f.round(2)}% covered."
end

def read(&block)
	@source.read(&block)
end

def to_a
	@counts
end

def to_s
	"\#<#{self.class} path=#{@path} #{percentage.to_f.round(2)}% covered>"
end

def zero?
	@total.zero?
end