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Diffstat (limited to 'ruby_1_9_3/lib/rexml/source.rb')
| -rw-r--r-- | ruby_1_9_3/lib/rexml/source.rb | 267 |
1 files changed, 0 insertions, 267 deletions
diff --git a/ruby_1_9_3/lib/rexml/source.rb b/ruby_1_9_3/lib/rexml/source.rb deleted file mode 100644 index 112393cfd4..0000000000 --- a/ruby_1_9_3/lib/rexml/source.rb +++ /dev/null @@ -1,267 +0,0 @@ -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.respond_to? :read and - arg.respond_to? :readline and - arg.respond_to? :nil? and - arg.respond_to? :eof? - IOSource.new(arg) - elsif arg.respond_to? :to_str - require 'stringio' - IOSource.new(StringIO.new(arg)) - elsif arg.kind_of? Source - arg - else - raise "#{arg.class} is not a valid input stream. It must walk \n"+ - "like either a String, an IO, or a 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 @encoding != 'UTF-8' - @buffer = decode(@buffer) - @to_utf = true - else - @to_utf = false - @buffer.force_encoding ::Encoding::UTF_8 - 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 str[0,2] == "\xfe\xff" - @line_break = "\000>" - elsif str[0,2] == "\xff\xfe" - @line_break = ">\000" - elsif str[0,2] == "\xef\xbb" - str += @source.read(1) - str = '' if (str[2,1] == "\xBF") - @line_break = ">" - else - @line_break = ">" - end - super( @source.eof? ? str : str+@source.readline( @line_break ) ) - - if !@to_utf and - @buffer.respond_to?(:force_encoding) and - @source.respond_to?(:external_encoding) and - @source.external_encoding != ::Encoding::UTF_8 - @force_utf8 = true - else - @force_utf8 = false - end - 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 - @buffer << readline - rescue Iconv::IllegalSequence - raise - rescue - @source = nil - end - end - rv = super - end - rv.taint - rv - end - - def read - begin - @buffer << readline - 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 - @buffer << readline - 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.pos rescue 0 - 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 - - private - def readline - str = @source.readline(@line_break) - return nil if str.nil? - - if @to_utf - decode(str) - else - str.force_encoding(::Encoding::UTF_8) if @force_utf8 - str - end - end - end -end |