struct Char::Reader

Creates a reader with the specified string positioned at byte index pos.

Creates a reader that will be positioned at the last char of the given string.

Returns the current character.

reader = Char::Reader.new("ab")
reader.current_char # => 'a'
reader.next_char
reader.current_char # => 'b'

Returns the size of the #current_char (in bytes) as if it were encoded in UTF-8.

reader = Char::Reader.new("aé")
reader.current_char_width # => 1
reader.next_char
reader.current_char_width # => 2

Yields successive characters from #string starting from #pos.

reader = Char::Reader.new("abc")
reader.next_char
reader.each do |c|
  puts c.upcase
end

B
C

If there was an error decoding the current char because of an invalid UTF-8 byte sequence, returns the byte that produced the invalid encoding. Returns 0 if the char would've been out of bounds. Otherwise returns nil.

Returns true if there is a character left to read. The terminating byte '\0' is considered a valid character by this method.

reader = Char::Reader.new("a")
reader.has_next?      # => true
reader.peek_next_char # => '\0'

Returns true if there are characters before the current one.

Reads the next character in the string, #pos is incremented. Raises IndexError if the reader is at the end of the #string.

reader = Char::Reader.new("ab")
reader.next_char # => 'b'

Returns the next character in the #string without incrementing #pos. Raises IndexError if the reader is at the end of the #string.

reader = Char::Reader.new("ab")
reader.peek_next_char # => 'b'
reader.current_char   # => 'a'

Returns the position of the current character.

reader = Char::Reader.new("ab")
reader.pos # => 0
reader.next_char
reader.pos # => 1

Sets #pos to pos.

reader = Char::Reader.new("abc")
reader.next_char
reader.next_char
reader.pos = 0
reader.current_char # => 'a'

Returns the previous character, #pos is decremented. Raises IndexError if the reader is at the beginning of the #string

Returns the reader's String.