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ruby--ruby/lib/rexml/source.rb
ser 1d8c98a486 Merges upstream changes for REXML v3.1.7
http://www.germane-software.com/repos/rexml/tags/3.1.7

 r1278@bean:  ser | 2007-06-07 00:53:06 -0400
 Fixed a double-encoding bug.  This was a regression, related
 to ticket:48.
 r1292@bean:  ser | 2007-07-25 08:19:36 -0400
  r1279@bean:  ser | 2007-06-09 23:19:02 -0400
  Fixes ticket:89 -- encoding CP-1252 was broken.  ISO-8859-15 had the same
  problem.
  
  Also in this patch is a fix to merge.rb (unused, but it should at least
  contain no errors), and a unit test for ticket:88.
 
 r1293@bean:  ser | 2007-07-25 08:19:37 -0400
  r1281@bean:  ser | 2007-07-24 11:08:48 -0400
  Addresses ticket:85
  
  This is a major rewrite of the XML formatting code.  The XML writers have all
  been extracted out of the classes and put into their own class containers.
  This makes writing parsers easier, and cleaner.
  
  There are three formatters, which correspond to the previous three XML writing
  modes:
  
    REXML::Formatters::Default    
        Prints the XML document exactly as it was parsed
    REXML::Formatters::Pretty     
        Pretty prints the XML document, destroying whitespace in the document
    REXML::Formatters::Transitive 
        Pretty prints the XML document, preserving whitespace
  
  All of the write() functions have been deprecated (some are still used, but
  these will also go away) except the write() function on Document, which is left
  for convenience.  To pretty print an XML document the canonical way:
  
    formatter = REXML::Formatters::Pretty.new( 5 ) # indent by 5 spaces
    formatter.write( document, output )
  
 
 r1294@bean:  ser | 2007-07-25 08:19:38 -0400
  r1283@bean:  ser | 2007-07-24 19:53:30 -0400
  This goes with the previous commit.
 
 r1295@bean:  ser | 2007-07-25 08:19:39 -0400
  r1285@bean:  ser | 2007-07-24 20:02:07 -0400
  And THIS goes with the previous two patches.  Dammit.
 
 r1296@bean:  ser | 2007-07-25 08:19:40 -0400
  r1287@bean:  ser | 2007-07-24 20:12:25 -0400
  Applied patch from Jeff Barczewski.  Note that this changes what the values of
  the name and IDs are from the previous behavior -- the values no longer include
  the quotes.  This is the correct behavior, so I'm leaving it in, but it is not
  backwards compatible.  Also fixes the serializer so that it outputs the doctype
  in a correct format (needed as a result of this change).
 
 r1297@bean:  ser | 2007-07-25 08:38:38 -0400
 Version update


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@12844 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2007-07-25 12:47:23 +00:00

247 lines
7 KiB
Ruby

require 'rexml/encoding'
module REXML
# Generates Source-s. USE THIS CLASS.
class SourceFactory
# Generates a Source object
# @param arg Either a String, or an IO
# @return a Source, or nil if a bad argument was given
def SourceFactory::create_from(arg)
if arg.kind_of? String
Source.new(arg)
elsif arg.respond_to? :read and
arg.respond_to? :readline and
arg.respond_to? :nil? and
arg.respond_to? :eof?
IOSource.new(arg)
elsif arg.kind_of? Source
arg
else
raise "#{source.class} is not a valid input stream. It must walk \n"+
"like either a String, IO, or Source."
end
end
end
# A Source can be searched for patterns, and wraps buffers and other
# objects and provides consumption of text
class Source
include Encoding
# The current buffer (what we're going to read next)
attr_reader :buffer
# The line number of the last consumed text
attr_reader :line
attr_reader :encoding
# Constructor
# @param arg must be a String, and should be a valid XML document
# @param encoding if non-null, sets the encoding of the source to this
# value, overriding all encoding detection
def initialize(arg, encoding=nil)
@orig = @buffer = arg
if encoding
self.encoding = encoding
else
self.encoding = check_encoding( @buffer )
end
@line = 0
end
# Inherited from Encoding
# Overridden to support optimized en/decoding
def encoding=(enc)
return unless super
@line_break = encode( '>' )
if enc != UTF_8
@buffer = decode(@buffer)
@to_utf = true
else
@to_utf = false
end
end
# Scans the source for a given pattern. Note, that this is not your
# usual scan() method. For one thing, the pattern argument has some
# requirements; for another, the source can be consumed. You can easily
# confuse this method. Originally, the patterns were easier
# to construct and this method more robust, because this method
# generated search regexes on the fly; however, this was
# computationally expensive and slowed down the entire REXML package
# considerably, since this is by far the most commonly called method.
# @param pattern must be a Regexp, and must be in the form of
# /^\s*(#{your pattern, with no groups})(.*)/. The first group
# will be returned; the second group is used if the consume flag is
# set.
# @param consume if true, the pattern returned will be consumed, leaving
# everything after it in the Source.
# @return the pattern, if found, or nil if the Source is empty or the
# pattern is not found.
def scan(pattern, cons=false)
return nil if @buffer.nil?
rv = @buffer.scan(pattern)
@buffer = $' if cons and rv.size>0
rv
end
def read
end
def consume( pattern )
@buffer = $' if pattern.match( @buffer )
end
def match_to( char, pattern )
return pattern.match(@buffer)
end
def match_to_consume( char, pattern )
md = pattern.match(@buffer)
@buffer = $'
return md
end
def match(pattern, cons=false)
md = pattern.match(@buffer)
@buffer = $' if cons and md
return md
end
# @return true if the Source is exhausted
def empty?
@buffer == ""
end
def position
@orig.index( @buffer )
end
# @return the current line in the source
def current_line
lines = @orig.split
res = lines.grep @buffer[0..30]
res = res[-1] if res.kind_of? Array
lines.index( res ) if res
end
end
# A Source that wraps an IO. See the Source class for method
# documentation
class IOSource < Source
#attr_reader :block_size
# block_size has been deprecated
def initialize(arg, block_size=500, encoding=nil)
@er_source = @source = arg
@to_utf = false
# Determining the encoding is a deceptively difficult issue to resolve.
# First, we check the first two bytes for UTF-16. Then we
# assume that the encoding is at least ASCII enough for the '>', and
# we read until we get one of those. This gives us the XML declaration,
# if there is one. If there isn't one, the file MUST be UTF-8, as per
# the XML spec. If there is one, we can determine the encoding from
# it.
@buffer = ""
str = @source.read( 2 )
if encoding
self.encoding = encoding
elsif /\A(?:\xfe\xff|\xff\xfe)/n =~ str
self.encoding = check_encoding( str )
elsif (0xef == str[0] && 0xbb == str[1])
str += @source.read(1)
str = '' if (0xbf == str[2])
else
@line_break = '>'
end
super str+@source.readline( @line_break )
end
def scan(pattern, cons=false)
rv = super
# You'll notice that this next section is very similar to the same
# section in match(), but just a liiittle different. This is
# because it is a touch faster to do it this way with scan()
# than the way match() does it; enough faster to warrent duplicating
# some code
if rv.size == 0
until @buffer =~ pattern or @source.nil?
begin
# READLINE OPT
#str = @source.read(@block_size)
str = @source.readline(@line_break)
str = decode(str) if @to_utf and str
@buffer << str
rescue Iconv::IllegalSequence
raise
rescue
@source = nil
end
end
rv = super
end
rv.taint
rv
end
def read
begin
str = @source.readline(@line_break)
str = decode(str) if @to_utf and str
@buffer << str
rescue Exception, NameError
@source = nil
end
end
def consume( pattern )
match( pattern, true )
end
def match( pattern, cons=false )
rv = pattern.match(@buffer)
@buffer = $' if cons and rv
while !rv and @source
begin
str = @source.readline(@line_break)
str = decode(str) if @to_utf and str
@buffer << str
rv = pattern.match(@buffer)
@buffer = $' if cons and rv
rescue
@source = nil
end
end
rv.taint
rv
end
def empty?
super and ( @source.nil? || @source.eof? )
end
def position
@er_source.stat.pipe? ? 0 : @er_source.pos
end
# @return the current line in the source
def current_line
begin
pos = @er_source.pos # The byte position in the source
lineno = @er_source.lineno # The XML < position in the source
@er_source.rewind
line = 0 # The \r\n position in the source
begin
while @er_source.pos < pos
@er_source.readline
line += 1
end
rescue
end
rescue IOError
pos = -1
line = -1
end
[pos, lineno, line]
end
end
end