by Jim Meehan and Henri Gouraud Last modified on Sat May 29 17:44:21 PDT 1993 by meehan

INTERFACEISO Latin-1 Characters and Character SetsISOChar ;

ISOChar deals with individual characters, including the ISO Latin-1 8-bit characters. It classifies characters into groups, like digits or punctuation; each group is represented as a set of characters. Finally, it provides mapping tables that translate lower-case letters into upper-case and the like.

TYPE T = CHAR; CONST All = SET OF T {'\000'.. '\377'}; Controls = SET OF T {'\000'.. '\037', '\177'.. '\217', '\231', '\234'}; Spaces = SET OF T {' ', '\t', '\n', '\r', '\f', '\240'}; Digits = SET OF T {'0'.. '9'}; Uppers = SET OF T {'A'.. 'Z', '\300'.. '\326', '\330'.. '\336'}; Lowers = SET OF T {'a'.. 'z', '\337'.. '\366', '\367'.. '\377'}; Letters = Uppers + Lowers; AlphaNumerics = Letters + Digits; Graphics = Asciis - Controls; Punctuation = Graphics - AlphaNumerics; Asciis = All; VAR Upper : ARRAY T OF T; Lower : ARRAY T OF T; Control : ARRAY T OF T; (* These constant arrays implement character conversions (mappings): Upper[c] = the upper-case equivalent of c if c is a letter, else c Lower[c] = the lower-case equivalent of c if c is a letter, else c Control[c] = the control-shifted equivalent of c if c is in Graphics (i.e. BitAnd (c, 037B)), else c *) END ISOChar.