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|
#
# stringio.rb
#
# Copyright (c) 1999-2003 Minero Aoki <aamine@loveruby.net>
#
# This program is free software.
# You can distribute/modify this program under the terms of
# the GNU Lesser General Public License version 2 or later.
#
# Id: stringio.rb,v 1.10 2003/04/27 22:02:14 aamine Exp
#
class StringInput#:nodoc:
include Enumerable
class << self
def new( str )
if block_given?
begin
f = super
yield f
ensure
f.close if f
end
else
super
end
end
alias open new
end
def initialize( str )
@src = str
@pos = 0
@closed = false
@lineno = 0
end
attr_reader :lineno
def string
@src
end
def inspect
"#<#{self.class}:#{@closed ? 'closed' : 'open'},src=#{@src[0,30].inspect}>"
end
def close
stream_check!
@pos = nil
@closed = true
end
def closed?
@closed
end
def pos
stream_check!
[@pos, @src.size].min
end
alias tell pos
def seek( offset, whence = IO::SEEK_SET )
stream_check!
case whence
when IO::SEEK_SET
@pos = offset
when IO::SEEK_CUR
@pos += offset
when IO::SEEK_END
@pos = @src.size - offset
else
raise ArgumentError, "unknown seek flag: #{whence}"
end
@pos = 0 if @pos < 0
@pos = [@pos, @src.size + 1].min
offset
end
def rewind
stream_check!
@pos = 0
end
def eof?
stream_check!
@pos > @src.size
end
def each( &block )
stream_check!
begin
@src.each(&block)
ensure
@pos = 0
end
end
def gets
stream_check!
if idx = @src.index(?\n, @pos)
idx += 1 # "\n".size
line = @src[ @pos ... idx ]
@pos = idx
@pos += 1 if @pos == @src.size
else
line = @src[ @pos .. -1 ]
@pos = @src.size + 1
end
@lineno += 1
line
end
def getc
stream_check!
ch = @src[@pos]
@pos += 1
@pos += 1 if @pos == @src.size
ch
end
def read( len = nil )
stream_check!
return read_all unless len
str = @src[@pos, len]
@pos += len
@pos += 1 if @pos == @src.size
str
end
alias sysread read
def read_all
stream_check!
return nil if eof?
rest = @src[@pos ... @src.size]
@pos = @src.size + 1
rest
end
def stream_check!
@closed and raise IOError, 'closed stream'
end
end
class StringOutput#:nodoc:
class << self
def new( str = '' )
if block_given?
begin
f = super
yield f
ensure
f.close if f
end
else
super
end
end
alias open new
end
def initialize( str = '' )
@dest = str
@closed = false
end
def close
@closed = true
end
def closed?
@closed
end
def string
@dest
end
alias value string
alias to_str string
def size
@dest.size
end
alias pos size
def inspect
"#<#{self.class}:#{@dest ? 'open' : 'closed'},#{id}>"
end
def print( *args )
stream_check!
raise ArgumentError, 'wrong # of argument (0 for >1)' if args.empty?
args.each do |s|
raise ArgumentError, 'nil not allowed' if s.nil?
@dest << s.to_s
end
nil
end
def puts( *args )
stream_check!
args.each do |str|
@dest << (s = str.to_s)
@dest << "\n" unless s[-1] == ?\n
end
@dest << "\n" if args.empty?
nil
end
def putc( ch )
stream_check!
@dest << ch.chr
nil
end
def printf( *args )
stream_check!
@dest << sprintf(*args)
nil
end
def write( str )
stream_check!
s = str.to_s
@dest << s
s.size
end
alias syswrite write
def <<( str )
stream_check!
@dest << str.to_s
self
end
private
def stream_check!
@closed and raise IOError, 'closed stream'
end
end
|
