Quick 'n Easy template parser in CoffeeScript

templar.coffee

# ------------------------------------------------------
# Really simple template parser in CoffeeScript.
# Matches {{keyword}} syntax.
#   Input:  string, object
#   Output: string
#
# Ex: templar("Hello {{planet}}!", {planet: "World"});
#       ->  outputs "Hello World!"
# ------------------------------------------------------
templar = (input, data) ->
  pattern = ///
    (?:\{{2}) # opening braces
    (\w+)     # variable name
    (?:\}{2}) # closing braces
  ///

  output = input

  while (pattern.test(output))
    varName = output.match(pattern)[1]
    output = output.replace(pattern, "#{data[varName]}")

  return output

I wrote this really bare-bones template parser for a recent project. Comes in super handy if you need to quickly add some on-the-fly templating to your project, or don't want to weigh it down with a full-fledged library like Mustache! :)