Jump To …

repl.coffee

#

A very simple Read-Eval-Print-Loop. Compiles one line at a time to JavaScript and evaluates it. Good for simple tests, or poking around the Node.js API. Using it looks like this:

coffee> puts "$num bottles of beer" for num in [99..1]

             		           
                               
                            
                 #               
               
Require the coffee-script module to get access to the compiler.
             		                            
CoffeeScript: require './coffee-script'
helpers:      require('./helpers').helpers
readline:     require 'readline'
             		           
                               
                            
                 #               
               
Start by opening up stdio.
             		                            
stdio: process.openStdin()
             		           
                               
                            
                 #               
               
Quick alias for quitting the REPL.
             		                            
helpers.extend global, {
  quit: -> process.exit(0)
}
             		           
                               
                            
                 #               
               
The main REPL function. run is called every time a line of code is entered.
Attempt to evaluate the command. If there's an exception, print it out instead
of exiting.
             		                            
run: (buffer) ->
  try
    val: CoffeeScript.run buffer.toString(), {noWrap: true, globals: true, source: 'repl'}
    puts inspect val if val isnt undefined
  catch err
    puts err.stack or err.toString()
  repl.prompt()
             		           
                               
                            
                 #               
               
Create the REPL by listening to stdin.
             		                            
repl: readline.createInterface stdio
repl.setPrompt 'coffee> '
stdio.addListener 'data',   (buffer) -> repl.write buffer
repl.addListener  'close',  -> stdio.destroy()
repl.addListener  'line',   run
repl.prompt()