Module: HTML5::OptionalTags

Defined in:: lib/h5-min/optional.rb

Constant Summary collapse

OPTIONAL = Optional tags as per www.whatwg.org/specs/web-apps/current-work/multipage/syntax.html#optional-tags

[
  # An html element's start tag may be omitted if the first thing inside
  # the html element is not a comment.
  %r{<html>},
  # An html element's end tag may be omitted if the html element is not
  # immediately followed by a comment.
  %r{</html>},
  # A head element's start tag may be omitted if the element is empty, or
  # if the first thing inside the head element is an element.
  %r{<head>},
  # A head element's end tag may be omitted if the head element is not
  # immediately followed by a space character or a comment.
  %r{</head>},
  # A body element's start tag may be omitted if the element is empty, or
  # if the first thing inside the body element is not a space character or
  # a comment, except if the first thing inside the body element is a
  # script or style element.
  %r{<body>\s?(?!<(script|style))},
  # A body element's end tag may be omitted if the body element is not
  # immediately followed by a comment.
  %r{</body>},
  # A li element's end tag may be omitted if the li element is immediately
  # followed by another li element or if there is no more content in the
  # parent element.
  %r{</li>\s?(?=(<li|</[uo]l))},
  # A dt element's end tag may be omitted if the dt element is immediately
  # followed by another dt element or a dd element.
  %r{</dt>\s?(?=<d[td])},
  # A dd element's end tag may be omitted if the dd element is immediately
  # followed by another dd element or a dt element, or if there is no more
  # content in the parent element.
  %r{</dd>\s?(?=(<d[dt]|</dl))},
  # A p element's end tag may be omitted if the p element is immediately
  # followed by an address, article, aside, blockquote, dir, div, dl,
  # fieldset, footer, form, h1, h2, h3, h4, h5, h6, header, hgroup, hr,
  # menu, nav, ol, p, pre, section, table, or ul, element, or if there is
  # no more content in the parent element and the parent element is not an
  # a element.
  %r{</p>\s?(?=(<(address|article|aside|blockquote|dir|div|dl|fieldset|footer|
  form|h\d|header|hgroup|hr|menu|nav|ol|p|pre|section|table|ul)|</))}x,
  %r{</p>\s?\Z},  
  # An rt element's end tag may be omitted if the rt element is
  # immediately followed by an rt or rp element, or if there is no more
  # content in the parent element.
  %r{</rt>\s?(?=(<r[tp]|</))}, 
  # An rp element's end tag may be omitted if the rp element is
  # immediately followed by an rt or rp element, or if there is no more
  # content in the parent element.
  %r{</rp>\s?(?=(<r[tp]|</))},
  # An optgroup element's end tag may be omitted if the optgroup element
  # is immediately followed by another optgroup element, or if there is no
  # more content in the parent element.
  %r{</optgroup>\s?(?=(<optgroup|</))},
  # An option element's end tag may be omitted if the option element is
  # immediately followed by another option element, or if it is
  # immediately followed by an optgroup element, or if there is no more
  # content in the parent element.
  %r{</option>\s?(?=(<(option|optgroup)|</))},
  # A colgroup element's start tag may be omitted if the first thing
  # inside the colgroup element is a col element, and if the element is
  # not immediately preceded by another colgroup element whose end tag has
  # been omitted. (It can't be omitted if the element is empty.)
  %r{<colgroup>\s?(?=<col)}, # FIXME: Incomplete
  # A colgroup element's end tag may be omitted if the colgroup element is
  # not immediately followed by a space character or a comment.
  %r{</colgroup>},
  # A thead element's end tag may be omitted if the thead element is
  # immediately followed by a tbody or tfoot element.
  %r{</thead>\s?(?=<t(body|foot))},
  # A tbody element's start tag may be omitted if the first thing inside
  # the tbody element is a tr element, and if the element is not
  # immediately preceded by a tbody, thead, or tfoot element whose end tag
  # has been omitted. (It can't be omitted if the element is empty.)
  %r{(?<=</t(head|body|foot)>)\s?<tbody>\s?(?=<tr)}x, # TODO: Look again
  # A tbody element's end tag may be omitted if the tbody element is
  # immediately followed by a tbody or tfoot element, or if there is no
  # more content in the parent element.
  %r{</tbody>\s?(?=(<t(body|foot)|</))},
  # A tfoot element's end tag may be omitted if the tfoot element is
  # immediately followed by a tbody element, or if there is no more
  # content in the parent element.
  %r{</tfoot>\s?(?=(<tbody|</))},
  # A tr element's end tag may be omitted if the tr element is immediately
  # followed by another tr element, or if there is no more content in the
  # parent element.
  %r{</tr>\s?(?=(<tr|</))},
  %r{</tr>\s?(?=(<t(body|foot|head)))}, # We may have already removed the
                                        # parent's end tag
  # A td element's end tag may be omitted if the td element is immediately
  # followed by a td or th element, or if there is no more content in the
  # parent element.
  %r{</td>\s?(?=(<t[dhr]|</))},
  # A th element's end tag may be omitted if the th element is immediately
  # followed by a td or th element, or if there is no more content in the
  # parent element.
  %r{</th>\s?(?=(<t[dhr]|</))},
  %r{</th>\s?(?=((<t(body|foot))|</))},

  #However, a start tag must never be omitted if it has any attributes.

  # The following are void elements
  # (http://www.whatwg.org/specs/web-apps/current-work/multipage/syntax.html#void-elements)
  # Therefore, their end tag must always be omitted
  %r{</area}, 
  %r{</base>}, 
  %r{</br>}, 
  %r{</col>}, 
  %r{</command>}, 
  %r{</embed>}, 
  %r{</hr>}, 
  %r{</img>}, 
  %r{</input>}, 
  %r{</keygen>}, 
  %r{</link>}, 
  %r{</meta>}, 
  %r{</param>}, 
  %r{</source>}, 
  %r{</track>}, 
  %r{</wbr>},
]

Class Method Summary collapse

.remove(html) ⇒ Object

Class Method Details

.remove(html) ⇒ `Object`

# File 'lib/h5-min/optional.rb', line 127

def self.remove html
  OPTIONAL.each do |regex|
    html.gsub!(/#{regex}/i, '')
  end
  html
end

Module: HTML5::OptionalTags

Constant Summary collapse

Class Method Summary collapse

Class Method Details

.remove(html) ⇒ Object

.remove(html) ⇒ `Object`