Module: Raheui::IO

Defined in:
lib/raheui/io.rb

Overview

IO methods for user input and output.

Class Method Summary collapse

Class Method Details

Print an character from character code.

value - The Integer character code to print.

Examples

IO.print_chr(97)
# a=> nil

IO.print_chr(0xAC00)
# 가=> nil

# Rescue RangeError
IO.print_chr(-1)
# [U+..FF]=> nil

# Rescue RangeError
IO.print_chr(0x110000)
# [U+110000]=> nil

Returns nothing.



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# File 'lib/raheui/io.rb', line 55

def self.print_chr(value)
  # See https://github.com/jruby/jruby/issues/1921.
  if RUBY_PLATFORM == 'java' &&
     (0xD800 <= value && value <= 0xDFFF || value > 0x10_FFFF)
    fail RangeError, "invalid codepoint 0x#{value.to_s(16).upcase} in UTF-8"
  end
  $stdout.print value.chr(Encoding::UTF_8)
rescue RangeError
  $stdout.print format('[U+%04X]', value)
end

.print_int(value) ⇒ Object

Print an Integer.

value - The Integer to print.

Examples

IO.print_int(42)
# 42=> nil

Returns nothing.



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# File 'lib/raheui/io.rb', line 30

def self.print_int(value)
  $stdout.print value
end

.read_chr ⇒ Object

Read an character from user input.

Returns the Integer character code of the character user entered.



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# File 'lib/raheui/io.rb', line 16

def self.read_chr
  $stdin.getc.ord
end

.read_int ⇒ Object

Read an Integer from user input.

Returns the Integer user entered.



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# File 'lib/raheui/io.rb', line 9

def self.read_int
  $stdin.gets.to_i
end