Re: The '^' character in strings
On Tue, Jul 01, 2014 at 06:10:35AM +0200, Danilo Kordic wrote: ^ starts an escape sequence. Yes. Or, perhaps to be more exact, they are read-macros. : (mapcar char (range 0 64)) - (NIL ^A ^B ^C ^D ^E ^F ^G ^H ^I ^J ^K ^L ^M ^N ^O ^P ^Q ^R ^S ^T ^U ^V ^W ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ ! \ # $ % ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; = ? @) # I think You see the pattern. : (setq v1 ^ ) - $384402410 # For example. : (length v1) - 0 : (char v1) - 0 # NULL character. I think that sequences that are not shown above are undefined and actual results are coincidence of implementation. I haven't found it in docs. Actually, this is the intended behavior. The first rule is, that '^' simply keeps the lowest 5 bits of a character. For example, he ASCII (or UTF-8) code for 'A' is 65, which is 101 binary. Keeping the lowest five bits gives 1. The second rule is that symbol names in PicoLisp cannot contain the null byte. It is used as a terminator internally (similar to C). Symbols without a name (i.e. the name consists _only_ of the null byte) are called anonymous symbols, and are printed with a leading '$' like the $384402410 above. ♪♫ Alex -- UNSUBSCRIBE: mailto:picolisp@software-lab.de?subject=Unsubscribe
The '^' character in strings
What is the special magic that ^ does in strings? If I do the following: (prinl hello ^ world) Then only hello is printed. If I read using (read) a string containing '^' it is similarly truncated. -- http://www.bluishcoder.co.nz -- UNSUBSCRIBE: mailto:picolisp@software-lab.de?subject=Unsubscribe
Re: The '^' character in strings
^ starts an escape sequence. : (mapcar char (range 0 64)) - (NIL ^A ^B ^C ^D ^E ^F ^G ^H ^I ^J ^K ^L ^M ^N ^O ^P ^Q ^R ^S ^T ^U ^V ^W ^X ^Y ^Z ^[ ^\ ^] ^^ ^_ ! \ # $ % ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; = ? @) # I think You see the pattern. : (setq v1 ^ ) - $384402410 # For example. : (length v1) - 0 : (char v1) - 0 # NULL character. I think that sequences that are not shown above are undefined and actual results are coincidence of implementation. I haven't found it in docs. Source code of interpreter should explain it best, but I can't understand it yet. On Tue, Jul 1, 2014 at 5:47 AM, Chris Double chris.dou...@double.co.nz wrote: What is the special magic that ^ does in strings? If I do the following: (prinl hello ^ world) Then only hello is printed. If I read using (read) a string containing '^' it is similarly truncated. -- http://www.bluishcoder.co.nz -- UNSUBSCRIBE: mailto:picolisp@software-lab.de?subject=Unsubscribe
