immutable class CHAR < $IS_LT{CHAR}, $HASH, $STR, $FMT
****
Objects which represent characters. This version is for ASCII. Other implementations might use UNICODE, etc.


Ancestors
$FMT $STR $HASH $IS_EQ
$IS_LT{_}



Public


Constants
const asize:=SYS::char_size;

Features
ascii_int:INT
**** The ASCII integer associated with each character in the minimal Sather character set. Returns -1 for other characters.
digit_value:INT
**** The numerical value of self as a decimal digit. -1 if it isn't.
fmt( f: STR ): STR
from_ascii_int(i:INT):SAME
**** The ASCII character corresponding to `i' for characters in the Sather set, and the character with code `i' for the remainder.
hash:INT
**** A very cheap, but not very good hash value. It just returns the hash of the integer representation of the char.
hex_digit_value:INT
**** The numerical value of self as a hexadecimal digit. -1 if it isn't.
int:INT
**** The integer version of self. Returns unsigned value. Built-in.
is_alpha:BOOL
**** True if self is an alphabetic character.
is_alphanum:BOOL
**** True if self is alphanumeric.
is_control:BOOL
**** True if self is a control character.
is_digit:BOOL
**** True if self is a digit.
is_eq(c:SAME):BOOL
**** True if self and `c' are equal.
is_eq(arg: $OB): BOOL .. Included as is_eq
is_hex_digit:BOOL
**** True if self is a hexadecimal digit.
is_lower:BOOL
**** True if self is lowercase.
is_lt(c:SAME):BOOL
**** True if self is earlier than `c' in the ordering of characters.
is_octal_digit:BOOL
**** True if self is an octal digit.
is_print:BOOL
**** True if self is a printing character.
is_punct:BOOL
**** True if self is punctuation.
is_space:BOOL
**** True if self is one of the whitespace characters: space, form feed, newline, carriage return, tab, vertical tab. NOTE: temporarily Ctrl-Z will be treated as whitespace. This
_______ensures_OS/2_compatibility_until_FILE_classes_are_fixed.
is_upper:BOOL
**** True if self is uppercase.
lower:CHAR
**** A lower case version of self. Leaves non-alphabetic chars unchanged.
octal_digit_value:INT
**** The numerical value of self as an octal digit. -1 if not.
pretty:STR
**** A pretty version of self. It includes single quotes around self and uses special codes or the octal representation for non printing characters.
str:STR
upper:CHAR
**** An upper case version of self. Leaves non-alphabetic chars unchanged.

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