<> <> <> <> DIRECTORY RopeReader, Rope, RopeInline, Environment, Space; RopeReaderMiscImpl: CEDAR MONITOR IMPORTS RopeReader, Rope, RopeInline, Space EXPORTS RopeReader SHARES RopeReader, Rope = BEGIN OPEN RopeReader, RopeInline; EqSubstrs: PUBLIC PROC [r1,r2: ROPE, start1,start2,len: Offset, rdr1,rdr2: Ref _ NIL] RETURNS [eq: BOOLEAN] = { <<-- uses readers rdr1 and rdr2 to read ropes r1 and r2 to test for equality>> <<-- returns TRUE if r1 is same as len chars of r2 starting at start>> free1, free2: BOOLEAN _ FALSE; size1: Offset _ InlineSize[r1]; size2: Offset _ InlineSize[r2]; start1 _ MIN[start1,size1]; start2 _ MIN[start2,size2]; IF len=MaxLen THEN { IF (len _ size1-start1) # size2-start2 THEN RETURN [FALSE] } ELSE IF start1+len > size1 THEN RETURN [FALSE] ELSE IF start2+len > size2 THEN RETURN [FALSE]; IF rdr1 = NIL THEN { rdr1 _ GetRopeReader[]; free1 _ TRUE }; IF rdr2 = NIL THEN { rdr2 _ GetRopeReader[]; free2 _ TRUE }; SetPosition[rdr1,r1,start1]; SetPosition[rdr2,r2,start2]; eq _ TRUE; WHILE len > 0 DO num: NAT _ Short[MIN[len,LAST[NAT]]]; -- loop on NAT instead of Offset len _ len-num; THROUGH [0..num) DO IF Get[rdr1]#Get[rdr2] THEN { eq _ FALSE; GOTO Finis }; ENDLOOP; REPEAT Finis => NULL; ENDLOOP; IF free1 THEN FreeRopeReader[rdr1]; IF free2 THEN FreeRopeReader[rdr2] }; CompareSubstrs: PUBLIC PROC [ r1, r2: ROPE, start1, len1, start2, len2: Offset, rdr1, rdr2: Ref _ NIL, case: BOOLEAN _ TRUE] RETURNS [result: Environment.Comparison] = { <<-- uses readers rdr1 and rdr2 to compare ropes r1 and r2>> <<-- if ~case then all characters forced lowercase for comparison>> Lower: PROC [c: CHARACTER] RETURNS [CHARACTER] = INLINE { RETURN [IF c NOT IN ['A..'Z] THEN c ELSE LOOPHOLE[LOOPHOLE[c,CARDINAL]+40B,CHARACTER]] }; size1: Offset _ InlineSize[r1]; size2: Offset _ InlineSize[r2]; rem, rem1, rem2: Offset; free1, free2: BOOLEAN _ FALSE; rem1 _ IF start1 > size1 THEN 0 ELSE size1-start1; rem2 _ IF start2 > size2 THEN 0 ELSE size2-start2; IF rdr1 = NIL THEN { rdr1 _ GetRopeReader[]; free1 _ TRUE }; IF rdr2 = NIL THEN { rdr2 _ GetRopeReader[]; free2 _ TRUE }; len1 _ MIN[len1,rem1]; len2 _ MIN[len2,rem2]; rem _ MIN[len1,len2]; SetPosition[rdr1,r1,start1]; SetPosition[rdr2,r2,start2]; result _ equal; WHILE rem > 0 DO num: NAT _ Short[MIN[rem,LAST[NAT]]]; rem _ rem-num; THROUGH [0..num) DO c1: CHARACTER _ Get[rdr1]; c2: CHARACTER _ Get[rdr2]; IF ~case THEN { c1 _ Lower[c1]; c2 _ Lower[c2] }; SELECT c1 FROM < c2 => { result _ less; GOTO Finis }; > c2 => { result _ greater; GOTO Finis }; ENDCASE; ENDLOOP; REPEAT Finis => NULL; ENDLOOP; IF free1 THEN FreeRopeReader[rdr1]; IF free2 THEN FreeRopeReader[rdr2]; RETURN [ IF result # equal THEN result ELSE SELECT TRUE FROM len1 < len2 => less, len1 > len2 => greater, ENDCASE => equal] }; <<-- implementation of ropes using character arrays>> <> <> <> numCharsArrays: INT _ 0; -- number allocated CharsRope: PUBLIC ENTRY PROC [ chars: Chars, space: Space.Handle _ Space.nullHandle] RETURNS [ROPE] = TRUSTED { ENABLE UNWIND => NULL; <> <> <> <> <> < {>> <> <> <> RETURN [NEW[Tobject _ [node[object[ charsPerArray,LOOPHOLE[chars],CharsFetch,CharsMap,NIL]]]]] }; spacesFinalized: INT _ 0; <> <> <> <> <> <> <> <> <<>> charsFinalized: INT _ 0; <> < NULL;>> <> <> <> <> <> <> <> <> <> <> <> <<>> countCList: INT _ 0; -- set by calling CountCList <> < NULL;>> <> <> <> <<>> CharsFetch: SAFE PROC [data: REF, index: Offset] RETURNS [c:CHAR] = TRUSTED { WITH data SELECT FROM x: Chars => RETURN[x[Short[index]]]; ENDCASE => ERROR Rope.NoRope }; CharsMap: SAFE PROC [base: REF, start,len: Offset, action: PROC [CHAR] RETURNS [BOOLEAN]] RETURNS [BOOLEAN] = TRUSTED { WITH base SELECT FROM x: Chars => { st: NAT _ Short[start]; FOR i: NAT IN [st..st+Short[len]) DO IF action[x[i]] THEN RETURN [TRUE]; ENDLOOP }; ENDCASE => ERROR Rope.NoRope; RETURN [FALSE] }; <<-- ***** rope reader cache>> Create: PUBLIC PROC RETURNS [Ref] = { RETURN[NEW[Body]] }; rdrs: NAT = 10; ReaderArray: TYPE = ARRAY [0..rdrs) OF Ref; readers: REF ReaderArray _ NEW[ReaderArray]; GetRopeReader: PUBLIC ENTRY PROC RETURNS [reader: Ref] = { ENABLE UNWIND => NULL; FOR i:NAT IN [0..rdrs) DO IF readers[i] # NIL THEN { reader _ readers[i]; readers[i] _ NIL; RETURN }; ENDLOOP; reader _ Create[] }; FreeRopeReader: PUBLIC ENTRY PROC [reader: Ref] = { ENABLE UNWIND => NULL; IF reader=NIL THEN RETURN; SetPosition[reader, NIL]; reader.charForEndOfRope _ FALSE; FOR i:NAT IN [0..rdrs) DO IF readers[i] = NIL THEN { readers[i] _ reader; RETURN }; ENDLOOP }; <<-- ***** Initialization>> <> StartRopeReaderMisc: PUBLIC PROC = TRUSTED { <> <> }; END.