Module: Parselly

Defined in:
lib/parselly.rb,
lib/parselly.rb,
lib/parselly/node.rb,
lib/parselly/lexer.rb,
lib/parselly/parser.rb,
lib/parselly/version.rb

Defined Under Namespace

Classes: LexError, Lexer, Node, ParseError, ParseResult, Parser, SyntaxError

Constant Summary collapse

VERSION = 
'1.3.0'

Class Method Summary collapse

Class Method Details

.escaped_hex(char) ⇒ Object 



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# File 'lib/parselly.rb', line 107

def escaped_hex(char)
  "\\#{char.ord.to_s(16)} "
end

.parse(selector, **options) ⇒ Object 



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# File 'lib/parselly.rb', line 66

def parse(selector, **options)
  Parser.new.parse(selector, **options)
end

.sanitize(selector) ⇒ Object 



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# File 'lib/parselly.rb', line 70

def sanitize(selector)
  scanner = StringScanner.new(selector)
  result = +''

  # Special case: if the selector is of length 1 and
  # the first character is `-`
  return "\\#{selector}" if selector.length == 1 && scanner.peek(1) == '-'

  until scanner.eos?
    # NULL character (U+0000)
    if scanner.scan(/\0/)
      result << "\uFFFD"
    # Control characters (U+0001 to U+001F, U+007F)
    elsif scanner.scan(/[\x01-\x1F\x7F]/)
      result << escaped_hex(scanner.matched)
    # First character is a digit (U+0030 to U+0039)
    elsif scanner.pos.zero? && scanner.scan(/\d/)
      result << escaped_hex(scanner.matched)
    # Second character is a digit and first is `-`
    elsif scanner.pos == 1 && scanner.peek(1).match?(/\d/) &&
          scanner.string.start_with?('-') && scanner.scan(/\d/)
      result << escaped_hex(scanner.matched)
    # Alphanumeric characters, `-`, `_`
    elsif scanner.scan(/[a-zA-Z0-9\-_]/)
      result << scanner.matched
    # Non-ASCII characters are valid CSS identifier characters.
    elsif scanner.scan(/[^\x00-\x7F]/)
      result << scanner.matched
    # Any other characters, escape them
    elsif scanner.scan(/./)
      result << "\\#{scanner.matched}"
    end
  end

  result
end