spectaql/vendor/resource-embedder/src/get-line-indent.coffee

A powerful library for autogenerating static GraphQL API documentation

###
  resource-embedder
  https://github.com/callumlocke/resource-embedder
  Copyright 2013 Callum Locke
  Licensed under the MIT license.
###

# Returns the characters leading from the last newline to `index` if
# those characters are whitespace, otherwise returns an empty string.
module.exports = (index, str) ->
  indent = []
  while index >= 0
    character = str[--index]
    switch character
      when ' ', '\t'
        indent.unshift character
      when '\n'
        return indent.join ''
      else
        return ''
  indent.join ''