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CD Fun House (Wayzata Technology).iso
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stringstuff
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1987-11-14
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3KB
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143 lines
UNIT stringf;
INTERFACE
VAR
upalpha : STRING;
lowalpha : STRING;
PROCEDURE sstrip (VAR word : STRING);
PROCEDURE wreverse (VAR word : STRING);
PROCEDURE upper (VAR word : STRING);
PROCEDURE makealpha (VAR word : STRING);
FUNCTION alphsize : integer;
FUNCTION strcmp (s, t : STRING) : integer;
IMPLEMENTATION
FUNCTION alphsize;
BEGIN
alphsize := length(upalpha);
END;
FUNCTION inpos (c : char) : integer;
VAR
i : integer;
BEGIN
i := 0;
REPEAT
i := i + 1;
UNTIL (c = lowalpha[i]) OR (i = alphsize);
IF c = lowalpha[i] THEN
inpos := i
ELSE
inpos := 0;
END;
PROCEDURE sstrip;
VAR
i : integer;
s : STRING;
BEGIN
i := 1;
s := word;
WHILE i <= length(s) DO
IF s[i] = ' ' THEN
delete(s, i, 1)
ELSE
i := i + 1;
word := s;
END;
(* returns the place in the alphabet of upalpha*)
FUNCTION index (c : char) : integer;
VAR
i : integer;
st : STRING;
BEGIN
st := upalpha;
i := 0;
IF length(st) > 0 THEN
REPEAT
i := i + 1;
UNTIL (c = st[i]) OR (i = length(st));
IF c = st[i] THEN
index := i
ELSE
index := 0;
END;
(* based on the c function with the same name*)
(*This function returns 1 if s is > t, - 1 if s < t*)
(* and 0 if s and t are identical. Comparison is done*)
(* using upalpha*)
FUNCTION strcmp;
VAR
i, j : integer;
u, v : STRING;
BEGIN
u := s;
v := t;
i := 1;
WHILE (index(u[i]) = index(v[i])) AND (i < length(u)) AND (i < length(v)) DO
i := i + 1;
IF i = length(s) THEN
strcmp := 0
ELSE IF index(u[i]) > index(v[i]) THEN
strcmp := 1
ELSE IF index(u[i]) < index(v[i]) THEN
strcmp := -1
ELSE
strcmp := 0;
END;
PROCEDURE wreverse;
VAR
i, l : integer;
s : STRING;
BEGIN
s := word;
l := length(word);
FOR i := 1 TO l DO
word[i] := s[l - i + 1];
END;
PROCEDURE upper;
VAR
i, lowtest : integer;
s : STRING;
BEGIN
s := word;
FOR i := 1 TO length(s) DO
BEGIN
lowtest := inpos(s[i]);
IF lowtest <> 0 THEN
s[i] := upalpha[lowtest];
END;
word := s;
END;
FUNCTION inup (c : char) : boolean;
VAR
i : integer;
s : STRING;
BEGIN
i := 0;
REPEAT
i := i + 1;
UNTIL (i = alphsize) OR (upalpha[i] = c);
IF upalpha[i] = c THEN
inup := true
ELSE
inup := false;
END;
PROCEDURE makealpha;
VAR
i : integer;
s : STRING;
lowers, uppers : SET OF char;
BEGIN
i := 1;
s := word;
upper(s);
WHILE i <= length(s) DO
IF NOT inup(s[i]) THEN
delete(s, i, 1) {zap that character}
ELSE
i := i + 1;
word := s;
END;
END.