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Document the error on over-long hex character constants. 2008-07-26 Aidan Kehoe <kehoea@parhasard.net> * lispref/objects.texi (Character Type): Document the error provoked when the reader sees an over-long hexadecimal constant.
author Aidan Kehoe <kehoea@parhasard.net>
date Sat, 26 Jul 2008 11:46:13 +0200
parents a99eb40f0b5b
children 95b04754ea8c
comparison
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4485:57db42ba54fb 4486:f9104f0e9b91
645 645
646 The first consists of a question mark 646 The first consists of a question mark
647 followed by a backslash and the character code in octal (up to three 647 followed by a backslash and the character code in octal (up to three
648 octal digits); thus, @samp{?\101} for the character @kbd{A}, 648 octal digits); thus, @samp{?\101} for the character @kbd{A},
649 @samp{?\001} for the character @kbd{C-a}, and @code{?\002} for the 649 @samp{?\001} for the character @kbd{C-a}, and @code{?\002} for the
650 character @kbd{C-b}. 650 character @kbd{C-b}. The reader will finalize the character and start
651 reading the next token when a non-octal-digit is encountered or three
652 octal digits are read.
651 653
652 The second consists of a question mark followed by a backslash, the 654 The second consists of a question mark followed by a backslash, the
653 character @samp{x}, and the character code in hexadecimal (up to two 655 character @samp{x}, and the character code in hexadecimal (up to two
654 hexadecimal digits); thus, @samp{?\x41} for the character @kbd{A}, 656 hexadecimal digits); thus, @samp{?\x41} for the character @kbd{A},
655 @samp{?\x1} for the character @kbd{C-a}, and @code{?\x2} for the 657 @samp{?\x1} for the character @kbd{C-a}, and @code{?\x2} for the
656 character @kbd{C-b}. 658 character @kbd{C-b}. If more than two hexadecimal codes are given, the
657 659 reader signals an error.
658 In both cases, the reader will finalize the character when a non-digit
659 is encountered or the maximum length of a character code is reached. It
660 then starts reading the next token.
661 660
662 @example 661 @example
663 @group 662 @group
664 ;; @r{Under XEmacs 20:} 663 ;; @r{Under XEmacs 20:}
665 ?\012 @result{} ?\n ?\n @result{} ?\n ?\C-j @result{} ?\n 664 ?\012 @result{} ?\n ?\n @result{} ?\n ?\C-j @result{} ?\n