Class: BetterSGMLParser

Inherits:
HTML::SGMLParser
  • Object
show all
Defined in:
lib/rfeedparser/better_sgmlparser.rb

Direct Known Subclasses

FeedParser::LooseFeedParser

Constant Summary collapse

Interesting =

Replaced Tagfind and Charref Regexps with the ones in feedparser.py This makes things work.

/[&<]/u
Incomplete = 
Regexp.compile('&([a-zA-Z][a-zA-Z0-9]*|#[0-9]*)?|<([a-zA-Z][^<>]*|/([a-zA-Z][^<>]*)?|![^<>]*)?', 64)
Entityref =

64 is the unicode flag

/&([a-zA-Z][-.a-zA-Z0-9]*)[^-.a-zA-Z0-9]/u
Charref = 
/&#(x?[0-9A-Fa-f]+)[^0-9A-Fa-f]/u
Shorttagopen = 
/'<[a-zA-Z][-.a-zA-Z0-9]*/u
Shorttag = 
/'<([a-zA-Z][-.a-zA-Z0-9]*)\/([^\/]*)\//u
Endtagopen =

Changed the RegExps to match the Python SGMLParser

/<\//u
Endbracket = 
/[<>]/u
Declopen = 
/<!/u
Piopenbegin = 
/^<\?/u
Piclose = 
/>/u
Commentopen = 
/<!--/u
Commentclose = 
/--\s*>/u
Tagfind = 
/[a-zA-Z][-_.:a-zA-Z0-9]*/u
Attrfind = 
Regexp.compile('\s*([a-zA-Z_][-:.a-zA-Z_0-9]*)(\s*=\s*'+
'(\'[^\']*\'|"[^"]*"|[\]\[\-a-zA-Z0-9./,:;+*%?!&$\(\)_#=~\'"@]*))?',
64)
Endtagfind = 
/\s*\/\s*>/u

Instance Method Summary collapse

Constructor Details

#initialize(verbose = false) ⇒ BetterSGMLParser

Returns a new instance of BetterSGMLParser.



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# File 'lib/rfeedparser/better_sgmlparser.rb', line 30

def initialize(verbose=false)
  super(verbose)
end

Instance Method Details

#error(message) ⇒ Object

Raises:



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# File 'lib/rfeedparser/better_sgmlparser.rb', line 255

def error(message)
  raise BetterSGMLParserError.new(message)
end

#feed(*args) ⇒ Object 



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# File 'lib/rfeedparser/better_sgmlparser.rb', line 33

def feed(*args)
  super(*args)
end

#goahead(_end) ⇒ Object 



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# File 'lib/rfeedparser/better_sgmlparser.rb', line 37

def goahead(_end)
  rawdata = @rawdata # woo, utf-8 magic
  i = 0
  n = rawdata.length
  while i < n
    if @nomoretags
      # handle_data_range does nothing more than set a "Range" that is never used. wtf?
      handle_data(rawdata[i...n]) # i...n means "range from i to n not including n" 
      i = n
      break
    end
    j = rawdata.index(Interesting, i) 
    j = n unless j
    handle_data(rawdata[i...j]) if i < j
    i = j
    break if (i == n)
    if rawdata[i..i] == '<' # Yeah, ugly, but I prefer it to rawdata[i] == ?<
      if rawdata.index(Starttagopen,i) == i
        if @literal
          handle_data(rawdata[i..i])
          i = i+1
          next
        end
        k = parse_starttag(i)
        break unless k
        i = k
        next
      end
      if rawdata.index(Endtagopen,i) == i #Don't use Endtagopen
        k = parse_endtag(i)
        break unless k
        i = k
        @literal = false
        next
      end
      if @literal
        if n > (i+1)
          handle_data("<")
          i = i+1
        else
          #incomplete
          break
        end
        next
      end
      if rawdata.index(Commentopen,i) == i 
        k = parse_comment(i)
        break unless k
        i = k
        next
      end
      if rawdata.index(Piopenbegin,i) == i # Like Piopen but must be at beginning of rawdata
        k = parse_pi(i)
        break unless k
        i += k
        next
      end
      if rawdata.index(Declopen,i) == i
        # This is some sort of declaration; in "HTML as
        # deployed," this should only be the document type
        # declaration ("<!DOCTYPE html...>").
        k = parse_declaration(i)
        break unless k
        i = k
        next
      end
    elsif rawdata[i..i] == '&'
      if @literal # FIXME BUGME SGMLParser totally does not check this. Bug it.
        handle_data(rawdata[i..i])
        i += 1
        next
      end

      # the Char must come first as its #=~ method is the only one that is UTF-8 safe 
      ni,match = index_match(rawdata, Charref, i)
      if ni and ni == i # See? Ugly
        handle_charref(match[1]) # $1 is just the first group we captured (with parentheses)
        i += match[0].length  # $& is the "all" of the match.. it includes the full match we looked for not just the stuff we put parentheses around to capture. 
        i -= 1 unless rawdata[i-1..i-1] == ";"
        next
      end
      ni,match = index_match(rawdata, Entityref, i)
      if ni and ni == i
        handle_entityref(match[1])
        i += match[0].length
        i -= 1 unless rawdata[i-1..i-1] == ";"
        next
      end
    else
      error('neither < nor & ??')
    end
    # We get here only if incomplete matches but
    # nothing else
    ni,match = index_match(rawdata,Incomplete,i)
    unless ni and ni == 0
      handle_data(rawdata[i...i+1]) # str[i...i+1] == str[i..i]
      i += 1
      next
    end
    j = ni + match[0].length 
    break if j == n # Really incomplete
    handle_data(rawdata[i...j])
    i = j
  end # end while

  if _end and i < n
    handle_data(rawdata[i...n])
    i = n
  end

  @rawdata = rawdata[i..-1] 
  # @offset += i # FIXME BUGME another unused variable in SGMLParser?
end

#handle_decl(text) ⇒ Object 



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# File 'lib/rfeedparser/better_sgmlparser.rb', line 260

def handle_decl(text)
end

#handle_pi(text) ⇒ Object 



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# File 'lib/rfeedparser/better_sgmlparser.rb', line 258

def handle_pi(text)
end

#output ⇒ Object 



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# File 'lib/rfeedparser/better_sgmlparser.rb', line 250

def output
  # Return processed HTML as a single string
  return @pieces.map{|p| p.to_s}.join
end

#parse_comment(i) ⇒ Object 



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# File 'lib/rfeedparser/better_sgmlparser.rb', line 166

def parse_comment(i)
  rawdata = @rawdata
  if rawdata[i...i+4] != "<!--"
    error("unexpected call to parse_comment()")
  end
  ni,match = index_match(rawdata, Commentclose,i)
  return nil unless match
  handle_comment(rawdata[i+4..(ni-1)])
  return ni+match[0].length # Length from i to just past the closing comment tag
end

#parse_endtag(i) ⇒ Object 



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# File 'lib/rfeedparser/better_sgmlparser.rb', line 238

def parse_endtag(i)
  rawdata = @rawdata
  j, match = index_match(rawdata, /[<>]/,i+1)
  return nil unless j
  tag = rawdata[i+2...j].strip.downcase
  if rawdata[j..j] == ">"
    j += 1
  end
  finish_endtag(tag)
  return j
end

#parse_pi(i) ⇒ Object

Internal – parse processing instr, return length or -1 if not terminated



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# File 'lib/rfeedparser/better_sgmlparser.rb', line 153

def parse_pi(i)
  rawdata = @rawdata 
  if rawdata[i...i+2] != '<?' 
    error("unexpected call to parse_pi()")
  end
  ni,match = index_match(rawdata,Piclose,i+2)
  return nil unless match
  j = ni
  handle_pi(rawdata[i+2...j])
  j = (j + match[0].length)
  return j-i
end

#parse_starttag(i) ⇒ Object 



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# File 'lib/rfeedparser/better_sgmlparser.rb', line 178

def parse_starttag(i)
  @_starttag_text = nil
  start_pos = i
  rawdata = @rawdata
  ni,match = index_match(rawdata,Shorttagopen,i)
  if ni == i 
    # SGML shorthand: <tag/data/ == <tag>data</tag>
    # XXX Can data contain &... (entity or char refs)?
    # XXX Can data contain < or > (tag characters)?
    # XXX Can there be whitespace before the first /?
    k,match = index_match(rawdata,Shorttag,i)
    return nil unless match
    tag, data = match[1], match[2]
    @_starttag_text = "<#{tag}/"
    tag.downcase!
    second_end = rawdata.index(Shorttagopen,k)
    finish_shorttag(tag, data)
    @_starttag_text = rawdata[start_pos...second_end+1]
    return k
  end

  j = rawdata.index(Endbracket, i+1)
  return nil unless j
  attrsd = []
  if rawdata[i...i+2] == '<>'
    # SGML shorthand: <> == <last open tag seen>
    k = j
    tag = @lasttag
  else
    ni,match = index_match(rawdata,Tagfind,i+1)
    unless match
      error('unexpected call to parse_starttag')
    end
    k = ni+match[0].length+1
    tag = match[0].downcase
    @lasttag = tag
  end

  while k < j
    break if rawdata.index(Endtagfind, k) == k
    ni,match = index_match(rawdata,Attrfind,k)
    break unless ni
    matched_length = match[0].length
    attrname, rest, attrvalue = match[1],match[2],match[3]
    if rest.nil? or rest.empty?
      attrvalue = '' # was: = attrname # Why the change?
    elsif [?',?'] == [attrvalue[0..0], attrvalue[-1..-1]] or [?",?"] == [attrvalue[0],attrvalue[-1]]
      attrvalue = attrvalue[1...-1]
    end
    attrsd << [attrname.downcase, attrvalue]
    k += matched_length
  end
  if rawdata[j..j] == ">"
    j += 1
  end
  @_starttag_text = rawdata[start_pos...j]
  finish_starttag(tag, attrsd)
  return j
end