mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
d371e3583e
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31641 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
247 lines
8.6 KiB
Ruby
247 lines
8.6 KiB
Ruby
require 'rexml/parsers/baseparser'
|
|
require 'rexml/parseexception'
|
|
require 'rexml/namespace'
|
|
require 'rexml/text'
|
|
|
|
module REXML
|
|
module Parsers
|
|
# SAX2Parser
|
|
class SAX2Parser
|
|
def initialize source
|
|
@parser = BaseParser.new(source)
|
|
@listeners = []
|
|
@procs = []
|
|
@namespace_stack = []
|
|
@has_listeners = false
|
|
@tag_stack = []
|
|
@entities = {}
|
|
end
|
|
|
|
def source
|
|
@parser.source
|
|
end
|
|
|
|
def add_listener( listener )
|
|
@parser.add_listener( listener )
|
|
end
|
|
|
|
# Listen arguments:
|
|
#
|
|
# Symbol, Array, Block
|
|
# Listen to Symbol events on Array elements
|
|
# Symbol, Block
|
|
# Listen to Symbol events
|
|
# Array, Listener
|
|
# Listen to all events on Array elements
|
|
# Array, Block
|
|
# Listen to :start_element events on Array elements
|
|
# Listener
|
|
# Listen to All events
|
|
#
|
|
# Symbol can be one of: :start_element, :end_element,
|
|
# :start_prefix_mapping, :end_prefix_mapping, :characters,
|
|
# :processing_instruction, :doctype, :attlistdecl, :elementdecl,
|
|
# :entitydecl, :notationdecl, :cdata, :xmldecl, :comment
|
|
#
|
|
# There is an additional symbol that can be listened for: :progress.
|
|
# This will be called for every event generated, passing in the current
|
|
# stream position.
|
|
#
|
|
# Array contains regular expressions or strings which will be matched
|
|
# against fully qualified element names.
|
|
#
|
|
# Listener must implement the methods in SAX2Listener
|
|
#
|
|
# Block will be passed the same arguments as a SAX2Listener method would
|
|
# be, where the method name is the same as the matched Symbol.
|
|
# See the SAX2Listener for more information.
|
|
def listen( *args, &blok )
|
|
if args[0].kind_of? Symbol
|
|
if args.size == 2
|
|
args[1].each { |match| @procs << [args[0], match, blok] }
|
|
else
|
|
add( [args[0], nil, blok] )
|
|
end
|
|
elsif args[0].kind_of? Array
|
|
if args.size == 2
|
|
args[0].each { |match| add( [nil, match, args[1]] ) }
|
|
else
|
|
args[0].each { |match| add( [ :start_element, match, blok ] ) }
|
|
end
|
|
else
|
|
add([nil, nil, args[0]])
|
|
end
|
|
end
|
|
|
|
def deafen( listener=nil, &blok )
|
|
if listener
|
|
@listeners.delete_if {|item| item[-1] == listener }
|
|
@has_listeners = false if @listeners.size == 0
|
|
else
|
|
@procs.delete_if {|item| item[-1] == blok }
|
|
end
|
|
end
|
|
|
|
def parse
|
|
@procs.each { |sym,match,block| block.call if sym == :start_document }
|
|
@listeners.each { |sym,match,block|
|
|
block.start_document if sym == :start_document or sym.nil?
|
|
}
|
|
context = []
|
|
while true
|
|
event = @parser.pull
|
|
case event[0]
|
|
when :end_document
|
|
handle( :end_document )
|
|
break
|
|
when :start_doctype
|
|
handle( :doctype, *event[1..-1])
|
|
when :end_doctype
|
|
context = context[1]
|
|
when :start_element
|
|
@tag_stack.push(event[1])
|
|
# find the observers for namespaces
|
|
procs = get_procs( :start_prefix_mapping, event[1] )
|
|
listeners = get_listeners( :start_prefix_mapping, event[1] )
|
|
if procs or listeners
|
|
# break out the namespace declarations
|
|
# The attributes live in event[2]
|
|
event[2].each {|n, v| event[2][n] = @parser.normalize(v)}
|
|
nsdecl = event[2].find_all { |n, value| n =~ /^xmlns(:|$)/ }
|
|
nsdecl.collect! { |n, value| [ n[6..-1], value ] }
|
|
@namespace_stack.push({})
|
|
nsdecl.each do |n,v|
|
|
@namespace_stack[-1][n] = v
|
|
# notify observers of namespaces
|
|
procs.each { |ob| ob.call( n, v ) } if procs
|
|
listeners.each { |ob| ob.start_prefix_mapping(n, v) } if listeners
|
|
end
|
|
end
|
|
event[1] =~ Namespace::NAMESPLIT
|
|
prefix = $1
|
|
local = $2
|
|
uri = get_namespace(prefix)
|
|
# find the observers for start_element
|
|
procs = get_procs( :start_element, event[1] )
|
|
listeners = get_listeners( :start_element, event[1] )
|
|
# notify observers
|
|
procs.each { |ob| ob.call( uri, local, event[1], event[2] ) } if procs
|
|
listeners.each { |ob|
|
|
ob.start_element( uri, local, event[1], event[2] )
|
|
} if listeners
|
|
when :end_element
|
|
@tag_stack.pop
|
|
event[1] =~ Namespace::NAMESPLIT
|
|
prefix = $1
|
|
local = $2
|
|
uri = get_namespace(prefix)
|
|
# find the observers for start_element
|
|
procs = get_procs( :end_element, event[1] )
|
|
listeners = get_listeners( :end_element, event[1] )
|
|
# notify observers
|
|
procs.each { |ob| ob.call( uri, local, event[1] ) } if procs
|
|
listeners.each { |ob|
|
|
ob.end_element( uri, local, event[1] )
|
|
} if listeners
|
|
|
|
namespace_mapping = @namespace_stack.pop
|
|
# find the observers for namespaces
|
|
procs = get_procs( :end_prefix_mapping, event[1] )
|
|
listeners = get_listeners( :end_prefix_mapping, event[1] )
|
|
if procs or listeners
|
|
namespace_mapping.each do |ns_prefix, ns_uri|
|
|
# notify observers of namespaces
|
|
procs.each { |ob| ob.call( ns_prefix ) } if procs
|
|
listeners.each { |ob| ob.end_prefix_mapping(ns_prefix) } if listeners
|
|
end
|
|
end
|
|
when :text
|
|
#normalized = @parser.normalize( event[1] )
|
|
#handle( :characters, normalized )
|
|
copy = event[1].clone
|
|
|
|
esub = proc { |match|
|
|
if @entities.has_key?($1)
|
|
@entities[$1].gsub(Text::REFERENCE, &esub)
|
|
else
|
|
match
|
|
end
|
|
}
|
|
|
|
copy.gsub!( Text::REFERENCE, &esub )
|
|
copy.gsub!( Text::NUMERICENTITY ) {|m|
|
|
m=$1
|
|
m = "0#{m}" if m[0] == ?x
|
|
[Integer(m)].pack('U*')
|
|
}
|
|
handle( :characters, copy )
|
|
when :entitydecl
|
|
@entities[ event[1] ] = event[2] if event.size == 3
|
|
handle( *event )
|
|
when :processing_instruction, :comment, :attlistdecl,
|
|
:elementdecl, :cdata, :notationdecl, :xmldecl
|
|
handle( *event )
|
|
end
|
|
handle( :progress, @parser.position )
|
|
end
|
|
end
|
|
|
|
private
|
|
def handle( symbol, *arguments )
|
|
tag = @tag_stack[-1]
|
|
procs = get_procs( symbol, tag )
|
|
listeners = get_listeners( symbol, tag )
|
|
# notify observers
|
|
procs.each { |ob| ob.call( *arguments ) } if procs
|
|
listeners.each { |l|
|
|
l.send( symbol.to_s, *arguments )
|
|
} if listeners
|
|
end
|
|
|
|
# The following methods are duplicates, but it is faster than using
|
|
# a helper
|
|
def get_procs( symbol, name )
|
|
return nil if @procs.size == 0
|
|
@procs.find_all do |sym, match, block|
|
|
#puts sym.inspect+"=="+symbol.inspect+ "\t"+match.inspect+"=="+name.inspect+ "\t"+( (sym.nil? or symbol == sym) and ((name.nil? and match.nil?) or match.nil? or ( (name == match) or (match.kind_of? Regexp and name =~ match)))).to_s
|
|
(
|
|
(sym.nil? or symbol == sym) and
|
|
((name.nil? and match.nil?) or match.nil? or (
|
|
(name == match) or
|
|
(match.kind_of? Regexp and name =~ match)
|
|
)
|
|
)
|
|
)
|
|
end.collect{|x| x[-1]}
|
|
end
|
|
def get_listeners( symbol, name )
|
|
return nil if @listeners.size == 0
|
|
@listeners.find_all do |sym, match, block|
|
|
(
|
|
(sym.nil? or symbol == sym) and
|
|
((name.nil? and match.nil?) or match.nil? or (
|
|
(name == match) or
|
|
(match.kind_of? Regexp and name =~ match)
|
|
)
|
|
)
|
|
)
|
|
end.collect{|x| x[-1]}
|
|
end
|
|
|
|
def add( pair )
|
|
if pair[-1].respond_to? :call
|
|
@procs << pair unless @procs.include? pair
|
|
else
|
|
@listeners << pair unless @listeners.include? pair
|
|
@has_listeners = true
|
|
end
|
|
end
|
|
|
|
def get_namespace( prefix )
|
|
uris = (@namespace_stack.find_all { |ns| not ns[prefix].nil? }) ||
|
|
(@namespace_stack.find { |ns| not ns[nil].nil? })
|
|
uris[-1][prefix] unless uris.nil? or 0 == uris.size
|
|
end
|
|
end
|
|
end
|
|
end
|