Module: Pbind::Minify

Defined in:
lib/pbind/minify.rb

Class Method Summary collapse

Class Method Details

.json(str) ⇒ Object 



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# File 'lib/pbind/minify.rb', line 8

def json(str)

  ss = StringScanner.new(str)
  buf = ''

  until ss.eos?
    # Remove whitespace
    if s = ss.scan(/\s+/)

    # Scan punctuation
    elsif s = ss.scan(/[{},:\]\[]/)
      buf << s

    # Scan strings
    elsif s = ss.scan(/""|(".*?[^\\])?"/)
      buf << s

    # Scan reserved words
    elsif s = ss.scan(/(true|false|null)/)
      buf << s

    # Scan numbers
    elsif s = ss.scan(/-?\d+([.]\d+)?([eE][-+]?[0-9]+)?/)
      buf << s

    # Remove C++ style comments
    elsif s = ss.scan(%r{//})
      ss.scan_until(/(\r?\n|$)/)

    # Remove C style comments
    elsif s = ss.scan(%r{/[*]})
      ss.scan_until(%r{[*]/}) || raise(SyntaxError, "Unterminated /*...*/ comment - #{ss.rest}")

    # Anything else is invalid JSON
    else
      raise SyntaxError, "Unable to pre-scan string: #{ss.rest}"
    end
  end
  buf
end