Module: Rufus::Dollar

Defined in:
lib/rufus/dollar.rb

Constant Summary collapse

VERSION = 
'1.0.4'

Class Method Summary collapse

Class Method Details

.dsub(text, dict, offset = nil) ⇒ Object

Performs ‘dollar substitution’ on a piece of text with a given dictionary.

require 'rubygems'
require 'rufus/dollar'

h = {
  "name" => "Fred Brooke",
  "title" => "Silver Bullet"
}

puts Rufus::Dollar.dsub "${name} wrote '${title}'", h
  # => "Fred Brooke wrote 'Silver Bullet'"

$‘key or $“key

puts Rufus::Dollar.dsub "${name} wrote ${title}", h
  # => "Fred Brooke wrote Silver Bullet"

puts Rufus::Dollar.dsub "${name} wrote ${'title}", h
  # => 'Fred Brooke wrote "Silver Bullet"'



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# File 'lib/rufus/dollar.rb', line 63

def self.dsub(text, dict, offset=nil)

  text = text.to_s

  j = text.index('}', offset || 0)

  return text unless j

  t = text[0, j]

  i = t.rindex('${')
  ii = t.rindex("\\${")

  iii = t.rindex('{')
  iii = nil if offset

  return text unless i
  return dsub(text, dict, j+1) if (iii) and (iii-1 > i)

  return unescape(text) if (i) and (i != 0) and (ii == i-1)
    #
    # found "\${"

  key = text[i+2..j-1]
  quote = false

  if m = key.match(/^['"](.+)$/)
    key = m[1]
    quote = true
  end

  value = dict[key]

  value = if value.nil?
    ''
  elsif value.is_a?(String)
    value
  else
    value.inspect
  end

  value = value.inspect if quote

  pre = (i > 0) ? text[0..i-1] : ''

  dsub("#{pre}#{value}#{text[j+1..-1]}", dict)
end