Class: REXML::Parsers::BaseParser
- Defined in:
- lib/extensions/rexml/rexml/parsers/baseparser.rb,
lib/extensions/rhoxml/rexml/document.rb,
lib/extensions/rhoxml/rexml/parsers/baseparser.rb
Overview
Using the Pull Parser
This API is experimental, and subject to change.
parser = PullParser.new( "<a>text<b att='val'/>txet</a>" )
while parser.has_next?
res = parser.next
puts res[1]['att'] if res.start_tag? and res[0] == 'b'
end
See the PullEvent class for information on the content of the results. The data is identical to the arguments passed for the various events to the StreamListener API.
Notice that:
parser = PullParser.new( "<a>BAD DOCUMENT" )
while parser.has_next?
res = parser.next
raise res[1] if res.error?
end
Nat Price gave me some good ideas for the API.
Constant Summary collapse
- LETTER =
Ruby < 1.9 [doesn’t understand unicode]
'a-zA-Z'
- DIGIT =
'\d'
- COMBININGCHAR =
TODO
''
- EXTENDER =
TODO
''
- NCNAME_STR =
"[#{LETTER}_:][-#{LETTER}#{DIGIT}._:#{COMBININGCHAR}#{EXTENDER}]*"
- NAME_STR =
"(?:(#{NCNAME_STR}):)?(#{NCNAME_STR})"
- UNAME_STR =
"(?:#{NCNAME_STR}:)?#{NCNAME_STR}"
- NAMECHAR =
'[\-\w\d\.:]'
- NAME =
"([\\w:]#{NAMECHAR}*)"
- NMTOKEN =
"(?:#{NAMECHAR})+"
- NMTOKENS =
"#{NMTOKEN}(\\s+#{NMTOKEN})*"
- REFERENCE =
"&(?:#{NAME};|#\\d+;|#x[0-9a-fA-F]+;)"
- REFERENCE_RE =
/#{REFERENCE}/
- DOCTYPE_START =
/\A\s*<!DOCTYPE\s/um
- DOCTYPE_PATTERN =
/\s*<!DOCTYPE\s+(.*?)(\[|>)/um
- ATTRIBUTE_PATTERN =
/\s*(#{NAME_STR})\s*=\s*(["'])(.*?)\4/um
- COMMENT_START =
/\A<!--/u
- COMMENT_PATTERN =
/<!--(.*?)-->/um
- CDATA_START =
/\A<!\[CDATA\[/u
- CDATA_END =
/^\s*\]\s*>/um
- CDATA_PATTERN =
/<!\[CDATA\[(.*?)\]\]>/um
- XMLDECL_START =
/\A<\?xml\s/u
- XMLDECL_PATTERN =
/<\?xml\s+(.*?)\?>/um
- INSTRUCTION_START =
/\A<\?/u
- INSTRUCTION_PATTERN =
/<\?(.*?)(\s+.*?)?\?>/um
- TAG_MATCH =
/^<((?>#{NAME_STR}))\s*((?>\s+#{UNAME_STR}\s*=\s*(["']).*?\5)*)\s*(\/)?>/um
- CLOSE_MATCH =
/^\s*<\/(#{NAME_STR})\s*>/um
- VERSION =
/\bversion\s*=\s*["'](.*?)['"]/um
- ENCODING =
/\bencoding\s*=\s*["'](.*?)['"]/um
- STANDALONE =
/\bstandalone\s*=\s["'](.*?)['"]/um
- ENTITY_START =
/^\s*<!ENTITY/
- IDENTITY =
/^([!\*\w\-]+)(\s+#{NCNAME_STR})?(\s+["'](.*?)['"])?(\s+['"](.*?)["'])?/u
- ELEMENTDECL_START =
/^\s*<!ELEMENT/um
- ELEMENTDECL_PATTERN =
/^\s*(<!ELEMENT.*?)>/um
- SYSTEMENTITY =
/^\s*(%.*?;)\s*$/um
- ENUMERATION =
"\\(\\s*#{NMTOKEN}(?:\\s*\\|\\s*#{NMTOKEN})*\\s*\\)"
- NOTATIONTYPE =
"NOTATION\\s+\\(\\s*#{NAME}(?:\\s*\\|\\s*#{NAME})*\\s*\\)"
- ENUMERATEDTYPE =
"(?:(?:#{NOTATIONTYPE})|(?:#{ENUMERATION}))"
- ATTTYPE =
"(CDATA|ID|IDREF|IDREFS|ENTITY|ENTITIES|NMTOKEN|NMTOKENS|#{ENUMERATEDTYPE})"
- ATTVALUE =
"(?:\"((?:[^<&\"]|#{REFERENCE})*)\")|(?:'((?:[^<&']|#{REFERENCE})*)')"
- DEFAULTDECL =
"(#REQUIRED|#IMPLIED|(?:(#FIXED\\s+)?#{ATTVALUE}))"
- ATTDEF =
"\\s+#{NAME}\\s+#{ATTTYPE}\\s+#{DEFAULTDECL}"
- ATTDEF_RE =
/#{ATTDEF}/
- ATTLISTDECL_START =
/^\s*<!ATTLIST/um
- ATTLISTDECL_PATTERN =
/^\s*<!ATTLIST\s+#{NAME}(?:#{ATTDEF})*\s*>/um
- NOTATIONDECL_START =
/^\s*<!NOTATION/um
- PUBLIC =
/^\s*<!NOTATION\s+(\w[\-\w]*)\s+(PUBLIC)\s+(["'])(.*?)\3(?:\s+(["'])(.*?)\5)?\s*>/um
- SYSTEM =
/^\s*<!NOTATION\s+(\w[\-\w]*)\s+(SYSTEM)\s+(["'])(.*?)\3\s*>/um
- TEXT_PATTERN =
/\A([^<]*)/um
- PUBIDCHAR =
Entity constants
"\x20\x0D\x0Aa-zA-Z0-9\\-()+,./:=?;!*@$_%#"
- SYSTEMLITERAL =
%Q{((?:"[^"]*")|(?:'[^']*'))}
- PUBIDLITERAL =
%Q{("[#{PUBIDCHAR}']*"|'[#{PUBIDCHAR}]*')}
- EXTERNALID =
"(?:(?:(SYSTEM)\\s+#{SYSTEMLITERAL})|(?:(PUBLIC)\\s+#{PUBIDLITERAL}\\s+#{SYSTEMLITERAL}))"
- NDATADECL =
"\\s+NDATA\\s+#{NAME}"
- PEREFERENCE =
"%#{NAME};"
- ENTITYVALUE =
%Q{((?:"(?:[^%&"]|#{PEREFERENCE}|#{REFERENCE})*")|(?:'([^%&']|#{PEREFERENCE}|#{REFERENCE})*'))}
- PEDEF =
"(?:#{ENTITYVALUE}|#{EXTERNALID})"
- ENTITYDEF =
"(?:#{ENTITYVALUE}|(?:#{EXTERNALID}(#{NDATADECL})?))"
- PEDECL =
"<!ENTITY\\s+(%)\\s+#{NAME}\\s+#{PEDEF}\\s*>"
- GEDECL =
"<!ENTITY\\s+#{NAME}\\s+#{ENTITYDEF}\\s*>"
- ENTITYDECL =
/\s*(?:#{GEDECL})|(?:#{PEDECL})/um
- EREFERENCE =
/&(?!#{NAME};)/
- DEFAULT_ENTITIES =
{ 'gt' => [/>/, '>', '>', />/], 'lt' => [/</, '<', '<', /</], 'quot' => [/"/, '"', '"', /"/], "apos" => [/'/, "'", "'", /'/] }
- MISSING_ATTRIBUTE_QUOTES =
These are patterns to identify common markup errors, to make the error messages more informative.
/^<#{NAME_STR}\s+#{NAME_STR}\s*=\s*[^"']/um
Instance Attribute Summary collapse
-
#source ⇒ Object
readonly
Returns the value of attribute source.
Instance Method Summary collapse
- #add_listener(listener) ⇒ Object
-
#empty? ⇒ Boolean
Returns true if there are no more events.
- #entity(reference, entities) ⇒ Object
-
#has_next? ⇒ Boolean
Returns true if there are more events.
-
#initialize(source) ⇒ BaseParser
constructor
A new instance of BaseParser.
-
#normalize(input, entities = nil, entity_filter = nil) ⇒ Object
Escapes all possible entities.
-
#peek(depth = 0) ⇒ Object
Peek at the
depth
event in the stack. - #position ⇒ Object
-
#pull ⇒ Object
Returns the next event.
- #stream=(source) ⇒ Object
-
#unnormalize(string, entities = nil, filter = nil) ⇒ Object
Unescapes all possible entities.
-
#unshift(token) ⇒ Object
Push an event back on the head of the stream.
Constructor Details
#initialize(source) ⇒ BaseParser
Returns a new instance of BaseParser.
122 123 124 |
# File 'lib/extensions/rexml/rexml/parsers/baseparser.rb', line 122 def initialize( source ) self.stream = source end |
Instance Attribute Details
#source ⇒ Object (readonly)
Returns the value of attribute source.
143 144 145 |
# File 'lib/extensions/rexml/rexml/parsers/baseparser.rb', line 143 def source @source end |
Instance Method Details
#add_listener(listener) ⇒ Object
126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 |
# File 'lib/extensions/rexml/rexml/parsers/baseparser.rb', line 126 def add_listener( listener ) if !defined?(@listeners) or !@listeners @listeners = [] instance_eval <<-EOL alias :_old_pull :pull def pull event = _old_pull @listeners.each do |listener| listener.receive event end event end EOL end @listeners << listener end |
#empty? ⇒ Boolean
Returns true if there are no more events
165 166 167 |
# File 'lib/extensions/rexml/rexml/parsers/baseparser.rb', line 165 def empty? return (@source.empty?() and @stack.empty?()) end |
#entity(reference, entities) ⇒ Object
454 455 456 457 458 459 460 461 462 |
# File 'lib/extensions/rexml/rexml/parsers/baseparser.rb', line 454 def entity( reference, entities ) value = nil value = entities[ reference ] if entities if not value value = DEFAULT_ENTITIES[ reference ] value = value[2] if value end unnormalize( value, entities ) if value end |
#has_next? ⇒ Boolean
Returns true if there are more events. Synonymous with !empty?
170 171 172 |
# File 'lib/extensions/rexml/rexml/parsers/baseparser.rb', line 170 def has_next? return !(@source.empty?() and @stack.empty?()) end |
#normalize(input, entities = nil, entity_filter = nil) ⇒ Object
Escapes all possible entities
465 466 467 468 469 470 471 472 473 474 475 476 477 478 |
# File 'lib/extensions/rexml/rexml/parsers/baseparser.rb', line 465 def normalize( input, entities=nil, entity_filter=nil ) copy = input.clone # Doing it like this rather than in a loop improves the speed copy.gsub!( EREFERENCE, '&' ) entities.each do |key, value| copy.gsub!( value, "&#{key};" ) unless entity_filter and entity_filter.include?(entity) end if entities copy.gsub!( EREFERENCE, '&' ) DEFAULT_ENTITIES.each do |key, value| copy.gsub!( value[3], value[1] ) end copy end |
#peek(depth = 0) ⇒ Object
Peek at the depth
event in the stack. The first element on the stack is at depth 0. If depth
is -1, will parse to the end of the input stream and return the last event, which is always :end_document. Be aware that this causes the stream to be parsed up to the depth
event, so you can effectively pre-parse the entire document (pull the entire thing into memory) using this method.
186 187 188 189 190 191 192 193 194 195 196 197 198 |
# File 'lib/extensions/rexml/rexml/parsers/baseparser.rb', line 186 def peek depth=0 raise %Q[Illegal argument "#{depth}"] if depth < -1 temp = [] if depth == -1 temp.push(pull()) until empty? else while @stack.size+temp.size < depth+1 temp.push(pull()) end end @stack += temp if temp.size > 0 @stack[depth] end |
#position ⇒ Object
155 156 157 158 159 160 161 162 |
# File 'lib/extensions/rexml/rexml/parsers/baseparser.rb', line 155 def position if @source.respond_to? :position @source.position else # FIXME 0 end end |
#pull ⇒ Object
Returns the next event. This is a PullEvent
object.
201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 |
# File 'lib/extensions/rexml/rexml/parsers/baseparser.rb', line 201 def pull if @closed x, @closed = @closed, nil return [ :end_element, x ] end return [ :end_document ] if empty? return @stack.shift if @stack.size > 0 #STDERR.puts @source.encoding @source.read if @source.buffer.size<2 #STDERR.puts "BUFFER = #{@source.buffer.inspect}" if @document_status == nil #@source.consume( /^\s*/um ) word = @source.match( /^((?:\s+)|(?:<[^>]*>))/um ) word = word[1] unless word.nil? #STDERR.puts "WORD = #{word.inspect}" case word when COMMENT_START return [ :comment, @source.match( COMMENT_PATTERN, true )[1] ] when XMLDECL_START #STDERR.puts "XMLDECL" results = @source.match( XMLDECL_PATTERN, true )[1] version = VERSION.match( results ) version = version[1] unless version.nil? encoding = ENCODING.match(results) encoding = encoding[1] unless encoding.nil? @source.encoding = encoding standalone = STANDALONE.match(results) standalone = standalone[1] unless standalone.nil? return [ :xmldecl, version, encoding, standalone ] when INSTRUCTION_START return [ :processing_instruction, *@source.match(INSTRUCTION_PATTERN, true)[1,2] ] when DOCTYPE_START md = @source.match( DOCTYPE_PATTERN, true ) @nsstack.unshift(curr_ns=Set.new) identity = md[1] close = md[2] identity =~ IDENTITY name = $1 raise REXML::ParseException.new("DOCTYPE is missing a name") if name.nil? pub_sys = $2.nil? ? nil : $2.strip long_name = $4.nil? ? nil : $4.strip uri = $6.nil? ? nil : $6.strip args = [ :start_doctype, name, pub_sys, long_name, uri ] if close == ">" @document_status = :after_doctype @source.read if @source.buffer.size<2 md = @source.match(/^\s*/um, true) @stack << [ :end_doctype ] else @document_status = :in_doctype end return args when /^\s+/ else @document_status = :after_doctype @source.read if @source.buffer.size<2 md = @source.match(/\s*/um, true) if @source.encoding == "UTF-8" if @source.buffer.respond_to? :force_encoding @source.buffer.force_encoding("UTF-8") #Encoding::UTF_8) end end end end if @document_status == :in_doctype md = @source.match(/\s*(.*?>)/um) case md[1] when SYSTEMENTITY match = @source.match( SYSTEMENTITY, true )[1] return [ :externalentity, match ] when ELEMENTDECL_START return [ :elementdecl, @source.match( ELEMENTDECL_PATTERN, true )[1] ] when ENTITY_START match = @source.match( ENTITYDECL, true ).to_a.compact match[0] = :entitydecl ref = false if match[1] == '%' ref = true match.delete_at 1 end # Now we have to sort out what kind of entity reference this is if match[2] == 'SYSTEM' # External reference match[3] = match[3][1..-2] # PUBID match.delete_at(4) if match.size > 4 # Chop out NDATA decl # match is [ :entity, name, SYSTEM, pubid(, ndata)? ] elsif match[2] == 'PUBLIC' # External reference match[3] = match[3][1..-2] # PUBID match[4] = match[4][1..-2] # HREF # match is [ :entity, name, PUBLIC, pubid, href ] else match[2] = match[2][1..-2] match.pop if match.size == 4 # match is [ :entity, name, value ] end match << '%' if ref return match when ATTLISTDECL_START md = @source.match( ATTLISTDECL_PATTERN, true ) raise REXML::ParseException.new( "Bad ATTLIST declaration!", @source ) if md.nil? element = md[1] contents = md[0] pairs = {} values = md[0].scan( ATTDEF_RE ) values.each do |attdef| unless attdef[3] == "#IMPLIED" attdef.compact! val = attdef[3] val = attdef[4] if val == "#FIXED " pairs[attdef[0]] = val if attdef[0] =~ /^xmlns:(.*)/ @nsstack[0] << $1 end end end return [ :attlistdecl, element, pairs, contents ] when NOTATIONDECL_START md = nil if @source.match( PUBLIC ) md = @source.match( PUBLIC, true ) vals = [md[1],md[2],md[4],md[6]] elsif @source.match( SYSTEM ) md = @source.match( SYSTEM, true ) vals = [md[1],md[2],nil,md[4]] else raise REXML::ParseException.new( "error parsing notation: no matching pattern", @source ) end return [ :notationdecl, *vals ] when CDATA_END @document_status = :after_doctype @source.match( CDATA_END, true ) return [ :end_doctype ] end end begin if @source.buffer[0] == ?< if @source.buffer[1] == ?/ @nsstack.shift last_tag = @tags.pop #md = @source.match_to_consume( '>', CLOSE_MATCH) md = @source.match( CLOSE_MATCH, true ) raise REXML::ParseException.new( "Missing end tag for "+ "'#{last_tag}' (got \"#{md[1]}\")", @source) unless last_tag == md[1] return [ :end_element, last_tag ] elsif @source.buffer[1] == ?! md = @source.match(/\A(\s*[^>]*>)/um) #STDERR.puts "SOURCE BUFFER = #{source.buffer}, #{source.buffer.size}" raise REXML::ParseException.new("Malformed node", @source) unless md if md[0][2] == ?- md = @source.match( COMMENT_PATTERN, true ) case md[1] when /--/, /-$/ raise REXML::ParseException.new("Malformed comment", @source) end return [ :comment, md[1] ] if md else md = @source.match( CDATA_PATTERN, true ) return [ :cdata, md[1] ] if md end raise REXML::ParseException.new( "Declarations can only occur "+ "in the doctype declaration.", @source) elsif @source.buffer[1] == ?? md = @source.match( INSTRUCTION_PATTERN, true ) return [ :processing_instruction, md[1], md[2] ] if md raise REXML::ParseException.new( "Bad instruction declaration", @source) else # Get the next tag md = @source.match(TAG_MATCH, true) unless md # Check for missing attribute quotes raise REXML::ParseException.new("missing attribute quote", @source) if @source.match(MISSING_ATTRIBUTE_QUOTES ) raise REXML::ParseException.new("malformed XML: missing tag start", @source) end attributes = {} prefixes = Set.new prefixes << md[2] if md[2] @nsstack.unshift(curr_ns=Set.new) if md[4].size > 0 attrs = md[4].scan( ATTRIBUTE_PATTERN ) raise ::REXML::ParseException.new( "error parsing attributes: [#{attrs.join ', '}], excess = \"#$'\"", @source) if $' and $'.strip.size > 0 attrs.each { |a,b,c,d,e| if b == "xmlns" if c == "xml" if d != "http://www.w3.org/XML/1998/namespace" msg = "The 'xml' prefix must not be bound to any other namespace "+ "(http://www.w3.org/TR/REC-xml-names/#ns-decl)" raise ::REXML::ParseException.new( msg, @source, self ) end elsif c == "xmlns" msg = "The 'xmlns' prefix must not be declared "+ "(http://www.w3.org/TR/REC-xml-names/#ns-decl)" raise ::REXML::ParseException.new( msg, @source, self) end curr_ns << c elsif b prefixes << b unless b == "xml" end if attributes.has_key? a msg = "Duplicate attribute #{a.inspect}" raise ::REXML::ParseException.new( msg, @source, self) end attributes[a] = e } end # Verify that all of the prefixes have been defined #for prefix in prefixes prefixes.each do |prefix| unless @nsstack.find{|k| k.member?(prefix)} raise ::REXML::UndefinedNamespaceException.new(prefix,@source,self) end end if md[6] @closed = md[1] @nsstack.shift else @tags.push( md[1] ) end return [ :start_element, md[1], attributes ] end else md = @source.match( TEXT_PATTERN, true ) if md[0].length == 0 @source.match( /(\s+)/, true ) end #STDERR.puts "GOT #{md[1].inspect}" unless md[0].length == 0 #return [ :text, "" ] if md[0].length == 0 # unnormalized = Text::unnormalize( md[1], self ) # return PullEvent.new( :text, md[1], unnormalized ) return [ :text, md[1] ] end rescue REXML::UndefinedNamespaceException raise rescue REXML::ParseException raise rescue Exception, NameError => error raise REXML::ParseException.new( "Exception parsing", @source, self, (error ? error : $!) ) end return [ :dummy ] end |
#stream=(source) ⇒ Object
145 146 147 148 149 150 151 152 153 |
# File 'lib/extensions/rexml/rexml/parsers/baseparser.rb', line 145 def stream=( source ) @source = SourceFactory.create_from( source ) @closed = nil @document_status = nil @tags = [] @stack = [] @entities = [] @nsstack = [] end |
#unnormalize(string, entities = nil, filter = nil) ⇒ Object
Unescapes all possible entities
481 482 483 |
# File 'lib/extensions/rexml/rexml/parsers/baseparser.rb', line 481 def unnormalize( string, entities=nil, filter=nil ) string end |
#unshift(token) ⇒ Object
Push an event back on the head of the stream. This method has (theoretically) infinite depth.
176 177 178 |
# File 'lib/extensions/rexml/rexml/parsers/baseparser.rb', line 176 def unshift token @stack.unshift(token) end |