class Sass::Repl

and prints the result.
evaluates them,
reads in SassScript expressions,
It presents a prompt on the terminal,
Runs a SassScript read-eval-print loop.

def initialize(options = {})

Parameters:
  • options ({Symbol => Object}) -- An options hash. 
def initialize(options = {})
  @options = options
end

def parse_input(environment, text) 

def parse_input(environment, text)
  case text
  when Script::MATCH
    name = $1
    guarded = !!$3
    val = Script::Parser.parse($2, @line, text.size - ($3 || '').size - $2.size)
    unless guarded && environment.var(name)
      environment.set_var(name, val.perform(environment))
    end
    p environment.var(name)
  else
    p Script::Parser.parse(text, @line, 0).perform(environment)
  end
rescue Sass::SyntaxError => e
  puts "SyntaxError: #{e.message}"
  if @options[:trace]
    e.backtrace.each do |line|
      puts "\tfrom #{line}"
    end
  end
end

def run

Starts the read-eval-print loop. 
def run
  environment = Environment.new
  @line = 0
  loop do
    @line += 1
    unless (text = Readline.readline('>> '))
      puts
      return
    end
    Readline::HISTORY << text
    parse_input(environment, text)
  end
end