MTMiscOpsImpl.mesa
Last Edited by: HGM, March 4, 1984 0:02:34 am PST
Last Edited by: Nichols, July 13, 1983 5:13 pm
Last Edited by: Taft, February 5, 1984 1:41:45 pm PST
DIRECTORY
Ascii USING [Digit],
MTMiscOps,
Rope USING [Cat, Equal, Fetch, FromChar, IsEmpty, Length, ROPE, Translate, TranslatorType];
MTMiscOpsImpl: CEDAR PROGRAM
IMPORTS Ascii, Rope
EXPORTS MTMiscOps =
BEGIN OPEN MTMiscOps;
Lookup: PUBLIC PROC [name: Rope.ROPE, table: Table] RETURNS [BOOL] = {
Returns TRUE if name is in table.
WHILE table # NIL DO
IF name.Equal[table.first, FALSE] THEN RETURN [TRUE];
table ← table.rest;
ENDLOOP;
RETURN [FALSE];
};
AToI: PUBLIC PROC [r: Rope.ROPE] RETURNS [i: INT] ~ {
Convert the leading digits of r into an integer.
j: INT;
i ← 0;
FOR j ← 0, j+1 WHILE j < r.Length AND Ascii.Digit[r.Fetch[j]] DO
i ← i*10 + (r.Fetch[j]-'0);
ENDLOOP;
};
IToA: PUBLIC PROC [i: INT] RETURNS [r: Rope.ROPE] ~ {
Convert i into a rope.
minus: BOOL ~ i < 0;
IF minus THEN
i ← -i;
r ← NIL;
WHILE i > 0 DO
r ← Rope.Cat[Rope.FromChar[i MOD 10 + '0], r];
i ← i / 10;
ENDLOOP;
IF r.IsEmpty THEN
r ← "0";
IF minus THEN
r ← Rope.Cat["-", r];
};
Substitute: PUBLIC PROC [r: Rope.ROPE, oldChar, newChar: CHAR] RETURNS [newR: Rope.ROPE] ~ {
Return r with newChar substituted for every instance of oldChar.
Translator: Rope.TranslatorType ~ {
IF old = oldChar THEN RETURN [newChar]
ELSE RETURN [old];
};
RETURN [r.Translate[translator: Translator]];
};
END.