Module: Puppeteer::PSelectorParser

Defined in:
lib/puppeteer/p_selector_parser.rb

Defined Under Namespace

Classes: PseudoSelector

Constant Summary collapse

PSEUDO_PREFIX = 
'::-p-'

Class Method Summary collapse

Class Method Details

.parse(selector) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/puppeteer/p_selector_parser.rb', line 18

def self.parse(selector)
  is_pure_css = true
  has_pseudo_classes = false
  has_aria = false

  selectors = []
  compound = []
  complex = [compound]
  storage = +''

  i = 0
  length = selector.length
  in_quote = nil
  escaped = false
  paren_depth = 0

  while i < length
    char = selector[i]

    if escaped
      storage << char
      escaped = false
      i += 1
      next
    end

    if char == '\\'
      storage << char
      escaped = true
      i += 1
      next
    end

    if in_quote
      if char == in_quote
        in_quote = nil
      end
      storage << char
      i += 1
      next
    end

    if char == '"' || char == "'"
      in_quote = char
      storage << char
      i += 1
      next
    end

    if char == '('
      paren_depth += 1
      storage << char
      i += 1
      next
    end

    if char == ')'
      paren_depth = [paren_depth - 1, 0].max
      storage << char
      i += 1
      next
    end

    if paren_depth == 0
      if starts_with_at?(selector, i, '>>>>')
        flush_storage(storage, compound)
        complex << '>>>>'
        compound = []
        complex << compound
        is_pure_css = false
        i += 4
        next
      end

      if starts_with_at?(selector, i, '>>>')
        flush_storage(storage, compound)
        complex << '>>>'
        compound = []
        complex << compound
        is_pure_css = false
        i += 3
        next
      end

      if starts_with_at?(selector, i, PSEUDO_PREFIX)
        flush_storage(storage, compound)
        i += PSEUDO_PREFIX.length
        name, i = parse_name(selector, i)
        raise ArgumentError.new('Invalid PSelector name') if name.empty?

        i = skip_spaces(selector, i)
        value = ''
        if selector[i] == '('
          value, i = parse_argument(selector, i)
        end
        value = unquote(value.strip)

        compound << PseudoSelector.new(name: name, value: value)
        is_pure_css = false
        has_aria = true if name == 'aria'
        next
      end

      if char == ','
        flush_storage(storage, compound)
        selectors << complex
        compound = []
        complex = [compound]
        i += 1
        next
      end

      if char == ':' && selector[i, PSEUDO_PREFIX.length] != PSEUDO_PREFIX
        if selector[i + 1] != ':'
          has_pseudo_classes = true
        end
      end
    end

    storage << char
    i += 1
  end

  raise ArgumentError.new('Unterminated string in PSelector') if in_quote
  raise ArgumentError.new('Unterminated parentheses in PSelector') if paren_depth != 0

  flush_storage(storage, compound)
  selectors << complex if complex.any?

  [selectors, is_pure_css, has_pseudo_classes, has_aria]
end