Class: IO
- Inherits:
-
Object
- Object
- IO
- Defined in:
- lib/scanf.rb
Instance Method Summary collapse
-
#scanf(str, &b) ⇒ Object
Scans the current string until the match is exhausted, yielding each match as it is encountered in the string.
Instance Method Details
#scanf(str, &b) ⇒ Object
Scans the current string until the match is exhausted, yielding each match as it is encountered in the string. A block is not necessary though, as the results will simply be aggregated into the final array.
"123 456".block_scanf("%d")
# => [123, 456]
If a block is given, the value from that is returned from the yield is added to an output array.
"123 456".block_scanf("%d") do |digit,| # the ',' unpacks the Array
digit + 100
end
# => [223, 556]
See Scanf for details on creating a format string.
You will need to require ‘scanf’ to use IO#scanf.
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# File 'lib/scanf.rb', line 614 def scanf(str,&b) #:yield: current_match return block_scanf(str,&b) if b return [] unless str.size > 0 start_position = pos rescue 0 matched_so_far = 0 source_buffer = "" result_buffer = [] final_result = [] fstr = Scanf::FormatString.new(str) loop do if eof || (tty? &&! fstr.match(source_buffer)) final_result.concat(result_buffer) break end source_buffer << gets current_match = fstr.match(source_buffer) spec = fstr.last_spec_tried if spec.matched if spec.mid_match? result_buffer.replace(current_match) next end elsif (fstr.matched_count == fstr.spec_count - 1) if /\A\s*\z/.match(fstr.string_left) break if spec.count_space? result_buffer.replace(current_match) next end end final_result.concat(current_match) matched_so_far += source_buffer.size source_buffer.replace(fstr.string_left) matched_so_far -= source_buffer.size break if fstr.last_spec fstr.prune end begin seek(start_position + matched_so_far, IO::SEEK_SET) rescue Errno::ESPIPE end soak_up_spaces if fstr.last_spec && fstr.space return final_result end |