Module: SC::Helpers::SplitCSS

Defined in:
lib/sproutcore/helpers/css_split.rb

Constant Summary collapse

UNTIL_SINGLE_QUOTE = 
/(?!\\)'/
UNTIL_DOUBLE_QUOTE = 
/(?!\\)"/
BEGIN_SCOPE = 
/\{/
END_SCOPE = 
/\}/
NORMAL_SCAN_UNTIL = 
/[^{},]+/
MAX_SELECTOR_COUNT = 
4000

Class Method Summary collapse

Class Method Details

.handle_comment(scanner) ⇒ Object 



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# File 'lib/sproutcore/helpers/css_split.rb', line 174

def self.handle_comment(scanner)
  str = '/*'
  
  scanner.pos += 2
  str << scanner.scan_until(/\*\//)
end

.handle_content(scanner) ⇒ Object 



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# File 'lib/sproutcore/helpers/css_split.rb', line 139

def self.handle_content(scanner)
  str = ""
  
  res = scanner.scan(NORMAL_SCAN_UNTIL)
  if res.nil?
    str << scanner.getch
  else
    str << res
  end
  
  str
end

.handle_scope(scanner) ⇒ Object 



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# File 'lib/sproutcore/helpers/css_split.rb', line 115

def self.handle_scope(scanner)
  str = ""
  
  # Consume the begin scope we matched
  str << scanner.scan(BEGIN_SCOPE)
  
  while not scanner.eos?
    str << handle_skip(scanner)
    
    if scanner.match? BEGIN_SCOPE
      str << self.handle_scope(scanner)
    end
    
    if scanner.match? END_SCOPE
      str << scanner.scan(END_SCOPE)
      return str
    end
    
    str << handle_content(scanner)
  end
  
  str
end

.handle_skip(scanner) ⇒ Object 



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# File 'lib/sproutcore/helpers/css_split.rb', line 152

def self.handle_skip(scanner)
  str = ""

  while true do
    if scanner.match?(/\s+/)
      str << scanner.scan(/\s+/)
      next
    end
    if scanner.match?(/\/\*/)
      str << handle_comment(scanner)
      next
    end
    if scanner.match?(/["']/)
      str << handle_string(scanner)
      next
    end
    break
  end
  
  str
end

.handle_string(scanner) ⇒ Object 



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# File 'lib/sproutcore/helpers/css_split.rb', line 181

def self.handle_string(scanner)
  str = scanner.getch
  str += scanner.scan_until(str == "'" ? UNTIL_SINGLE_QUOTE : UNTIL_DOUBLE_QUOTE)
  
  str
end

.split_css(input) ⇒ Object 



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# File 'lib/sproutcore/helpers/css_split.rb', line 49

def self.split_css(input)
  scanner = StringScanner.new(input)
  
  current = ""
  ret = [current]
  
  selectors = ""
  in_selector = false
  selector_count = 0
  
  while not scanner.eos?
    # Handle any strings, etc. This also handles whitespace, strings, blah.
    # Basically, unless we see a scope, we know we are in a selector.
    selectors << handle_skip(scanner)
    
    # Handle scope
    if scanner.match?(BEGIN_SCOPE)
      # Push the current selectors
      current << selectors
      selectors = ""
      in_selector = false
      
      current << handle_scope(scanner)
      
      # For readability and reliability in certain browsers, add a newline at the end
      # of each rule.
      current << "\n"
      next
    end
    
    # Handle , -- which would mean we are finishing a selector
    if scanner.match? /,/
      selectors << scanner.scan(/,/)
      in_selector = false
      
      next
    end
    
    if not in_selector
      # At this point we MUST be in a selector.
      in_selector = true
      selector_count += 1
      
      if selector_count > MAX_SELECTOR_COUNT
        current = ""
        ret << current
        
        selector_count = 0
      end
    end
    
    # skip over anything that our tokens do not start with. We implement this differently
    # since these are ONLY selectors, and therefore we must add them to selector instead of output.
    res = scanner.scan(NORMAL_SCAN_UNTIL)
    break if scanner.eos?
    
    if res.nil?
      selectors << scanner.getch
    else
      selectors << res
    end
  end
  
  ret
end