Class: StringIO

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# File 'opal/stdlib/stringio.rb', line 15
def initialize(string = "", mode = 'rw')
 @string = string
 @position = string.length
 if mode.include?('r') and not mode.include?('w')
 @closed = :write
 elsif mode.include?('w') and not mode.include?('r')
 @closed = :read
 end
end

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# File 'opal/stdlib/stringio.rb', line 13
def string
 @string
end

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# File 'opal/stdlib/stringio.rb', line 5
def self.open(string = "", mode = nil, &block)
 io = new(string, mode)
 res = block.call(io)
 io.close
 res
end

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# File 'opal/stdlib/stringio.rb', line 176
def check_readable
 if closed_read?
 raise IOError, "not opened for reading"
 end
end

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# File 'opal/stdlib/stringio.rb', line 170
def check_writable
 if closed_write?
 raise IOError, "not opened for writing"
 end
end

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# File 'opal/stdlib/stringio.rb', line 138
def close
 @closed = :both
end

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# File 'opal/stdlib/stringio.rb', line 142
def close_read
 if @closed == :write
 @closed = :both
 else
 @closed = :read
 end
end

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# File 'opal/stdlib/stringio.rb', line 150
def close_write
 if @closed == :read
 @closed = :both
 else
 @closed = :write
 end
end

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# File 'opal/stdlib/stringio.rb', line 158
def closed?
 @closed == :both
end

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# File 'opal/stdlib/stringio.rb', line 162
def closed_read?
 @closed == :read || @closed == :both
end

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# File 'opal/stdlib/stringio.rb', line 166
def closed_write?
 @closed == :write || @closed == :both
end

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# File 'opal/stdlib/stringio.rb', line 71
def each_byte(&block)
 return enum_for :each_byte unless block
 check_readable
 i = @position
 until eof?
 block.call(@string[i].ord)
 i += 1
 end
 self
end

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# File 'opal/stdlib/stringio.rb', line 85
def each_char(&block)
 return enum_for :each_char unless block
 check_readable
 i = @position
 until eof?
 block.call(@string[i])
 i += 1
 end
 self
end

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# File 'opal/stdlib/stringio.rb', line 26
def eof?
 check_readable
 @position == @string.length
end

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# File 'opal/stdlib/stringio.rb', line 116
def read(length = nil, outbuf = nil)
 check_readable
 return if eof?
 string = if length
 str = @string[@position, length]
 @position += length
 str
 else
 str = @string[@position .. -1]
 @position = @string.length
 str
 end
 if outbuf
 outbuf.write(string)
 else
 string
 end
end

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# File 'opal/stdlib/stringio.rb', line 67
def rewind
 seek 0
end

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# File 'opal/stdlib/stringio.rb', line 34
def seek(pos, whence = IO::SEEK_SET)
 case whence
 when IO::SEEK_SET
 raise Errno::EINVAL unless pos >= 0
 @position = pos
 when IO::SEEK_CUR
 if @position + pos > @string.length
 @position = @string.length
 else
 @position += pos
 end
 when IO::SEEK_END
 if pos > @string.length
 @position = 0
 else
 @position -= pos
 end
 end
 0
end

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# File 'opal/stdlib/stringio.rb', line 59
def tell
 @position
end

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# File 'opal/stdlib/stringio.rb', line 99
def write(string)
 check_writable
 string = String (string)
 if @string.length == @position
 @string += string
 @position += string.length
 else
 before = @string[0 .. @position - 1]
 after = @string[@position + string.length .. -1]
 @string = before + string + after
 @position += string.length
 end
end