DIRECTORY
BasicTime USING [Now],
Commander USING [CommandProc, Register],
CommanderOps USING [ArgumentVector, Failed, Parse],
EditSpan USING [Copy],
FileNames USING [ResolveRelativePath],
FS USING [defaultStreamOptions, Error, FileInfo, StreamOpen, StreamOptions],
IO USING [Close, EndOfStream, GetBlock, GetCedarToken, GetCedarTokenRope, GetChar, GetIndex, noWhereStream, PeekChar, Put, PutChar, PutF, PutRope, RIS, RopeFromROS, ROS, SetIndex, SkipWhitespace, STREAM, TokenKind],
NodeProps USING [PutProp],
Process USING [CheckForAbort],
PutGet USING [FromFile, WritePlain],
RefText USING [AppendRope, Equal, Fetch, InlineAppendChar, Length, TrustTextAsRope],
Rope USING [Cat, Concat, Equal, Fetch, Flatten, FromRefText, Length, Match, ROPE],
SymTab USING [Create, EachPairAction, Fetch, FetchText, Insert, Pairs, Ref],
TextNode USING [LastWithin, Level, MakeNodeLoc, MakeNodeSpan, NodeRope, Ref, StepForward],
TiogaFileOps USING [AddLooks, CreateRoot, InsertAsLastChild, Ref, SetContents, Store];
Waterlily: CEDAR PROGRAM
IMPORTS BasicTime, Commander, CommanderOps, EditSpan, FileNames, FS, IO, NodeProps, Process, PutGet, RefText, Rope, SymTab, TextNode, TiogaFileOps = {

ROPE: TYPE = Rope.ROPE;
STREAM: TYPE = IO.STREAM;

SymbolTableEntry: TYPE = REF SymbolTableEntryRep;
SymbolTableEntryRep: TYPE = RECORD[
oldList: InstanceList,	-- the old instances
newList: InstanceList,	-- the new instances
key: ROPE		-- the key used for the lookup
];

InstanceList: TYPE = LIST OF InstanceRep;
InstanceRep: TYPE = RECORD [
line: INT,	-- -1 => not yet assigned
pos: INT,	-- -1 => not yet assigned (node number if mergeFiles)
node: TextNode.Ref_NIL,	-- the node, if mergeFiles, instead of line
len: NAT,	-- length of original token
peek: CHAR	-- non-blank character after this token
];

FileArray: TYPE = REF FileArrayRep;
FileArrayRep: TYPE = RECORD [entry: SEQUENCE index: NAT OF FileArrayEntry];

FileArrayEntry: TYPE = REF FileArrayEntryRep;
FileArrayEntryRep: TYPE = RECORD [
symEntry: SymbolTableEntry,
instance: InstanceList,
otherIndex: INT,
node: TextNode.Ref_NIL,
typeOfPntr: {symTable, lineNum},
len: NAT _ 0];

Ref: TYPE = TextNode.Ref;
Node: TYPE = REF NodeBody;
NodeBody: TYPE = RECORD [root: Ref_NIL, node: Ref_NIL ];

LongHelpMsgW: ROPE =
"Waterlily compares two source files.  The command format is one of:
	Waterlily file1 file2
	Waterlily difFile _ file1 file2
where switches are syntactically before any argument.  Differences found are written on the difFile, with default extension '.dif'.  The available switches are:
   t    Tioga format files (default: TRUE)
   b   Bravo format files (default: FALSE)
   u   Unformatted files
   i    Ignore blank lines (default: TRUE)
   s    Strip digits trailing a _ char (for c2c)
   x    Output file is a merger of input files (ran out of mnemonics already!)
   p    Treat Tioga file as plain text (ie, compare comments too)
   	Input files must be Tioga-format files.
  #m  # of matching lines (default: 3)
  #c   # of trailing context lines (default: 1)
";
LongHelpMsgC: ROPE =
"CedarLily compares two Cedar-program source files.  Comparison is made at the source-language token level, so that only lexical differences will be found (formatting changes and modified comments will not affect the comparison).  The command format is one of:
	CedarLily file1 file2
	CedarLily difFile _ file1 file2
where switches are syntactically before any argument.  Differences found are written on the difFile, with default extension '.dif'.  The available switches are:
   u   Unformatted files
   i    Ignore blank lines (default: TRUE)
   p    Treat Tioga file as plain text (ie, compare comments too)
  #m  # of matching lines (default: 3)
  #c   # of trailing context lines (default: 1)
";
LongHelpMsgM: ROPE =
"Tigerlily produces a merged version of two Tioga-format files.  Nodes unique to file1 are included and indicated by overstriking.  Nodes unique to file2 are included and indicated by underlining.  Nodes that are common to both files are unchanged.  The command format is one of:
	Tigerlily file1 file2
	Tigerlily mergedFile _ file1 file2
where switches are syntactically before any argument.  The merged file is written on the mergedFile, with default extension '.merger'.  The available switches are:
   p    Treat Tioga file as plain text (ie, compare comments too)
  #m  # of matching lines (default: 3)
  #c   # of trailing context lines (default: 1)
";

repeats: NAT _ 1;
debugging: BOOL _ FALSE;
WaterlilyProc: Commander.CommandProc = {

Alarm: ERROR = CODE;

oldArray: FileArray;
newArray: FileArray;
out: STREAM _ cmd.out;
pData: REF _ cmd.procData.clientData;

totalNewLines: INT _ 0;
totalOldLines: INT _ 0;

posInNewFile: INT _ 0;
posInOldFile: INT _ 0;
nodeCount: INT _ 0;

newFile: REF; -- IO.STREAM or Node;
oldFile: REF; -- IO.STREAM or Node;
difFile: STREAM;
difFileNode: Node _ NIL;

newFileName: ROPE _ NIL;
oldFileName: ROPE _ NIL;
difFileName: ROPE _ NIL;

Asterisks: ROPE = "**************************************";
filler: ROPE = "->->->->->->";

FileType: TYPE = {tioga, bravo, unform};
switchNewFileType, switchOldFileType: FileType _ tioga;
switchIgnoreEmptyLinesNewFile, switchIgnoreEmptyLinesOldFile: BOOL _ TRUE;
switchTokens: BOOL _ FALSE;
switchMergeFiles: BOOL _ FALSE;
stripLeadingBlanks: BOOL _ FALSE;
stripDigitsTrailingArrow: BOOL _ FALSE;

switchLinesForMatch: NAT _ 3;
switchLinesForContext: NAT _ 1;

anyDifferencesSeen: BOOL _ FALSE;
indexN: INT;
indexO: INT;

LineType: TYPE = {new, old, both};
Vintage: TYPE = LineType[new..old];

SetSymbolTableEntry: PROC
[key: ROPE, node: TextNode.Ref, newOrOld: Vintage,
line: INT, pos: INT, len: NAT, peek: CHAR] = {
symTabEntry: SymbolTableEntry _ NIL;
list: InstanceList _ LIST[[line: line, pos: pos, len: len, node: node, peek: peek]];
WITH SymTab.Fetch[symbolTable, key].val SELECT FROM
x: SymbolTableEntry => symTabEntry _ x;
ENDCASE => {
symTabEntry _ NEW[SymbolTableEntryRep _ [
oldList: NIL, newList: NIL, key: key]];
[] _ SymTab.Insert[symbolTable, key, symTabEntry];
};
SELECT newOrOld FROM
new => {
list.rest _ symTabEntry.newList;
symTabEntry.newList _ list;
};
old => {
list.rest _ symTabEntry.oldList;
symTabEntry.oldList _ list;
};
ENDCASE => ERROR;
};

PruneList: PROC [list: InstanceList, pos: INT] RETURNS [pruned: InstanceList] = {
IF list = NIL THEN RETURN [NIL];
IF list.first.pos = pos THEN RETURN [list.rest];
pruned _ list;
DO
lag: InstanceList _ list;
list _ list.rest;
IF list = NIL THEN RETURN;
IF list.first.pos = pos THEN {lag.rest _ list.rest; RETURN};
ENDLOOP;
};

ConnectEntries: PROC [symTabEntry: SymbolTableEntry, indexO, indexN: INT, entryO, entryN: FileArrayEntry] = {
entryN.typeOfPntr _ entryO.typeOfPntr _ lineNum;
entryN.otherIndex _ indexO;
entryO.otherIndex _ indexN;
symTabEntry.newList _ PruneList[symTabEntry.newList, entryN.instance.first.pos];
symTabEntry.oldList _ PruneList[symTabEntry.oldList, entryO.instance.first.pos];
};

EndOfFile: ERROR = CODE;

token: REF TEXT _ NEW[TEXT[128]];

GetLine: PROC [stream: STREAM, token: REF TEXT] RETURNS [REF TEXT] = {
token.length _ 0;
DO
c: CHAR;
IF lineBufferPos >= lineBufferLen THEN {
lineBuffer.length _ 0;
lineBufferLen _ IO.GetBlock[stream, lineBuffer, 0, lineBufferSize
! IO.EndOfStream => EXIT];
IF lineBufferLen = 0 THEN {
IF token.length = 0 THEN ERROR IO.EndOfStream[stream];
EXIT;
};
lineBuffer.length _ lineBufferLen;
lineBufferPos _ 0;
};
c _ lineBuffer[lineBufferPos];
lineBufferPos _ lineBufferPos + 1;
inputPos _ inputPos + 1;
IF IsEndOfLine[c] THEN EXIT;
token _ RefText.InlineAppendChar[token, c];
ENDLOOP;
RETURN [token];
};
lineBufferSize: NAT _ 1024;
lineBuffer: REF TEXT _ NEW[TEXT[lineBufferSize]];
lineBufferPos: NAT _ 0;
lineBufferLen: NAT _ 0;
inputPos: INT _ 0;

ReadLineFromFile: PROC
[source: REF, localFileType: FileType, localIgnoreEmpties: BOOL]
RETURNS [key: ROPE, node: TextNode.Ref, peek: CHAR, pos: INT, len: NAT] = {
SetToken: PROC [value: ROPE, append: BOOL _ FALSE] = {
IF NOT append THEN token.length _ 0;
token _ RefText.AppendRope[token, value];
};
in: STREAM;
inNode: Node;
WITH source SELECT FROM
str: STREAM => in _ str;
ref: Node => inNode _ ref;
ENDCASE => ERROR;
key _ NIL;
node _ NIL;
pos _ -1;
len _ 0;
peek _ 0C;
DO
Process.CheckForAbort[];
SELECT pData FROM
$Cedar => {
kind: IO.TokenKind;
token.length _ 0;
[] _ IO.SkipWhitespace[stream: in, flushComments: TRUE
! IO.EndOfStream => CONTINUE];
pos _ IO.GetIndex[in];
[tokenKind: kind, token: token, charsSkipped: ] _ IO.GetCedarToken[in, token
! IO.EndOfStream => ERROR EndOfFile];
IF kind = tokenEOF THEN ERROR EndOfFile;
len _ IO.GetIndex[in] - pos;
SELECT kind FROM
tokenROPE => {
len: NAT ~ RefText.Length[token];
lastChar: CHAR ~ IF ( len # 0 ) THEN RefText.Fetch[token, len.PRED] ELSE 0C;
SELECT lastChar FROM
'L => { token.length _ len.PRED }; -- disregard frame specifiers for strings!
'G => { token.length _ len.PRED }; -- disregard frame specifiers for strings!
ENDCASE;
};
tokenSINGLE => {
char: CHAR _ token[0];
SELECT char FROM
'_ => token[0] _ '¬; -- Character code finesse
'^ => token[0] _ '­; -- Character code finesse
'; => LOOP;
'} => {
[] _ IO.SkipWhitespace[stream: in, flushComments: TRUE
! IO.EndOfStream => CONTINUE];
peek _ IO.PeekChar[in
! IO.EndOfStream => {peek _ 0C; CONTINUE}];
IF peek = '. THEN ERROR EndOfFile;
};
ENDCASE;
};
tokenID => {
char: CHAR _ token[0];
[] _ IO.SkipWhitespace[stream: in, flushComments: TRUE
! IO.EndOfStream => CONTINUE];
peek _ IO.PeekChar[in
! IO.EndOfStream => {peek _ 0C; CONTINUE}];
SELECT char FROM
'B => SELECT TRUE FROM
RefText.Equal[token, "BEGIN"] => SetToken["{"];
RefText.Equal[token, "BOOLEAN"] => SetToken["BOOL"];
ENDCASE;
'C => SELECT TRUE FROM
RefText.Equal[token, "CHARACTER"] => SetToken["CHAR"];
RefText.Equal[token, "CARD"] => SetToken["CARD32"];
ENDCASE;
'E => SELECT TRUE FROM
RefText.Equal[token, "END"] => {
SetToken["}"];
IF peek = '. THEN ERROR EndOfFile;
};
ENDCASE;
'I => SELECT TRUE FROM
RefText.Equal[token, "INT"] => SetToken["INT32"];
ENDCASE;
'L => SELECT TRUE FROM
RefText.Equal[token, "LONG"] => {
key _ IO.GetCedarTokenRope[in].token;
SELECT TRUE FROM
Rope.Equal[key, "CARDINAL"] => SetToken["CARD32"];
Rope.Equal[key, "INTEGER"] => SetToken["INT32"];
ENDCASE => {SetToken["LONG "]; SetToken[key, TRUE]};
};
ENDCASE;
'P => SELECT TRUE FROM
RefText.Equal[token, "PROCEDURE"] => SetToken["PROC"];
ENDCASE;
ENDCASE;
SELECT peek FROM
'_ => {
ch: CHAR _ IO.GetChar[in];
peek _ '¬;
};
'^ => {
ch: CHAR _ IO.GetChar[in];
peek _ '­;
};
':, '¬, '­, '., ',, '~ => {
peek _ IO.GetChar[in];
};
ENDCASE => GO TO noHack;
token _ RefText.InlineAppendChar[token, peek];
len _ IO.GetIndex[in] - pos;
EXITS noHack => {};
};
ENDCASE;
WITH SymTab.FetchText[symbolTable, token].val SELECT FROM
symTabEntry: SymbolTableEntry => key _ symTabEntry.key;
ENDCASE => key _ Rope.FromRefText[token];
EXIT;
};
ENDCASE;

IF switchMergeFiles
THEN {
pos _ nodeCount;
nodeCount _ nodeCount+1;
node _ inNode.node _ inNode.node.StepForward[];
IF node = NIL THEN ERROR EndOfFile;
token.length _ 0;
token _ RefText.AppendRope[token, node.NodeRope[]];
}
ELSE {
pos _ inputPos;
token _ GetLine[in, token ! IO.EndOfStream => ERROR EndOfFile];
len _ token.length;
};
IF stripDigitsTrailingArrow OR stripLeadingBlanks OR localFileType = bravo THEN {
srcPos: NAT _ 0;
dstPos: NAT _ 0;
tLen: NAT = token.length;
IF stripLeadingBlanks THEN
WHILE srcPos < tLen DO
SELECT token[srcPos] FROM
' , '\t => srcPos _ srcPos + 1;
ENDCASE => EXIT;
ENDLOOP;
IF stripDigitsTrailingArrow OR localFileType = bravo THEN {
skipDigits: BOOL _ FALSE;
WHILE srcPos < tLen DO
c: CHAR _ token[srcPos];
srcPos _ srcPos + 1;
SELECT c FROM
'_ => skipDigits _ stripDigitsTrailingArrow;
IN ['0..'9] => IF skipDigits THEN LOOP;
'\032 => IF localFileType = bravo THEN EXIT;
ENDCASE => skipDigits _ FALSE;
token[dstPos] _ c;
dstPos _ dstPos + 1;
ENDLOOP;
};
len _ srcPos;
IF stripLeadingBlanks THEN
WHILE dstPos # 0 DO
SELECT token[dstPos-1] FROM
' , '\t => dstPos _ dstPos - 1;
ENDCASE => EXIT;
ENDLOOP;
token.length _ dstPos;
};
WITH SymTab.FetchText[symbolTable, token].val SELECT FROM
symTabEntry: SymbolTableEntry => key _ symTabEntry.key;
ENDCASE => key _ Rope.FromRefText[token];
IF localIgnoreEmpties THEN {
FOR i: NAT IN [0..token.length) DO
SELECT token[i] FROM
' , '\t => {};
ENDCASE => GO TO Gotit;
ENDLOOP;
peek _ peek;
}
ELSE GOTO Gotit;
ENDLOOP;
len _ len;
EXITS Gotit => pos _ pos
};

FinishUp: PROC [difMsg: ROPE] = {
IO.PutRope[out, difMsg];
IO.PutRope[out, "\n"];
IF switchMergeFiles THEN RETURN;
IF difFile = NIL THEN OpenDifFileAndWriteHeader[];
IO.PutRope[difFile, difMsg];
IO.PutRope[difFile, "\n"];
IO.Close[difFile];
};

WorkingMsg: PROC [char: CHAR] = {
Process.CheckForAbort[];
IO.PutChar[out, IF debugging THEN char ELSE '.];
};

OpenDifFileAndWriteHeader: PROC = {
IF anyDifferencesSeen THEN RETURN;
anyDifferencesSeen _ TRUE;
difFileName _ DefaultExtension[difFileName,
IF switchMergeFiles THEN ".merger" ELSE ".dif", TRUE];
IF switchMergeFiles THEN {
difFile _ IO.noWhereStream;
difFileNode _ NewNode[];
RETURN;
};
difFile _ FS.StreamOpen[difFileName, $create];
IO.PutRope[difFile, IF pData = $Cedar THEN "\nCedarlily" ELSE "\nWaterlily"];
IO.PutF[difFile, "\n   run on %g\n   File 1: %g\n   File 2: %g\n\n",
[time[BasicTime.Now[]]], [rope[oldFileName]], [rope[newFileName]]];
};

OpenFile: PROC [tempFileName: ROPE, switchFileType: FileType, writePlain: BOOL]
RETURNS [fileName: ROPE, file: REF] = {
streamOptions: FS.StreamOptions _ FS.defaultStreamOptions;
streamOptions[tiogaRead] _ (switchFileType = tioga);
tempFileName _ DefaultExtension[tempFileName, ".mesa", FALSE];
fileName _ FS.FileInfo[tempFileName].fullFName;
SELECT TRUE FROM
switchMergeFiles => file _ NodeFromFile[fileName];
writePlain => {
root: TextNode.Ref _ PutGet.FromFile[fileName];
s: IO.STREAM _ IO.ROS[];
PutGet.WritePlain[s, root];
file _ IO.RIS[IO.RopeFromROS[s]];
};
ENDCASE => file _ FS.StreamOpen[fileName, $read, streamOptions];
};


symbolTable: SymTab.Ref _ SymTab.Create[mod: 1023, case: TRUE];
fillerNode: Node _ NewNode[];
fillerNode.node _ TR[TiogaFileOps.InsertAsLastChild[FR[fillerNode.root]]];
TiogaFileOps.SetContents[FR[fillerNode.node], filler];
TiogaFileOps.AddLooks[FR[fillerNode.node], 0, filler.Length[], 'b, FR[fillerNode.root]];
NodeProps.PutProp[fillerNode.node, $Comment, NEW[BOOL_TRUE]];

result _ NIL;
msg _ NIL;

{
args: CommanderOps.ArgumentVector _ CommanderOps.Parse[cmd
! CommanderOps.Failed => {msg _ "Syntax error."; GO TO fatalError}
];

fileCount: NAT _ 0;
writePlain: BOOL _ FALSE;
defaultFileType: FileType _ tioga;
ignoreEmptyLines: BOOL _ TRUE;
IF pData=$Merge THEN { switchMergeFiles _ TRUE; ignoreEmptyLines _ FALSE; };

FOR i: NAT IN [1..args.argc) DO
arg: ROPE = args[i];
sense: BOOL _ TRUE;
IF Rope.Match["-*", arg] THEN {
len: NAT _ Rope.Length[arg];
number: INT _ 0;
FOR i: NAT IN [1..len) DO
c: CHAR _ Rope.Fetch[arg, i];
SELECT c FROM
'~ => sense _ NOT sense;
'b, 'B => defaultFileType _ bravo;
't, 'T => defaultFileType _ tioga;
'u, 'U => defaultFileType _ unform;
'i, 'I => ignoreEmptyLines _ sense;
's, 'S => stripDigitsTrailingArrow _ stripLeadingBlanks _ sense;
'x, 'X => {
switchMergeFiles _ sense;
IF sense THEN ignoreEmptyLines _ FALSE;
};
IN ['0..'9] => {number _ number*10 + (c-'0); LOOP};
'm, 'M => IF number >= 1 THEN switchLinesForMatch _ number;
'c, 'C => IF number >= 1 THEN switchLinesForContext _ number;
'p, 'P => writePlain _ TRUE;
ENDCASE;
number _ 0;
ENDLOOP;
LOOP;
};
IF Rope.Match["_", arg] THEN {
IF fileCount # 1 THEN GO TO usageError;
fileCount _ 0;
difFileName _ oldFileName;
LOOP;
};
SELECT fileCount FROM
0 => {
fileCount _ 1;
switchOldFileType _ defaultFileType;
switchIgnoreEmptyLinesOldFile _ ignoreEmptyLines;
oldFileName _ FileNames.ResolveRelativePath[arg];
IF difFileName = NIL THEN difFileName _ ShortName[arg];
};
1 => {
fileCount _ 2;
switchNewFileType _ defaultFileType;
switchIgnoreEmptyLinesNewFile _ ignoreEmptyLines;
newFileName _ FileNames.ResolveRelativePath[arg];
};
ENDCASE => {GO TO usageError};
ENDLOOP;
IF fileCount # 2 THEN GO TO usageError;

out.PutRope["Comparing "];
{
ENABLE FS.Error => {
IF error.group # bug THEN msg _ error.explanation;
GO TO fatalError;
};
[oldFileName, oldFile] _ OpenFile[oldFileName, switchOldFileType, writePlain];
[newFileName, newFile] _ OpenFile[newFileName, switchNewFileType, writePlain];
};
WorkingMsg['-];
};

{
nextLine: ROPE _ NIL;
nextNode: TextNode.Ref _ NIL;
peek: CHAR;
inputPos _ 0;
lineBufferLen _ 0;
lineBufferPos _ 0;
DO
key: ROPE;
len: NAT;
[key, nextNode, peek, posInNewFile, len] _ ReadLineFromFile[newFile, switchNewFileType, switchIgnoreEmptyLinesNewFile
! EndOfFile => EXIT];
SetSymbolTableEntry[key, nextNode, new, totalNewLines, posInNewFile, len, peek];
totalNewLines _ totalNewLines + 1;
ENDLOOP;
IF totalNewLines = 0 THEN GOTO emptyfile;
newArray _ NEW[FileArrayRep[totalNewLines]];
WorkingMsg['!];

inputPos _ 0;
lineBufferLen _ 0;
lineBufferPos _ 0;
DO
key: ROPE;
len: NAT;
[key, nextNode, peek, posInOldFile, len] _ ReadLineFromFile[oldFile, switchOldFileType, switchIgnoreEmptyLinesOldFile
! EndOfFile => EXIT];
SetSymbolTableEntry[key, nextNode, old, totalOldLines, posInOldFile, len, peek];
totalOldLines _ totalOldLines + 1;
ENDLOOP;
IF totalOldLines = 0 THEN GOTO emptyfile;
oldArray _ NEW[FileArrayRep[totalOldLines]];
WorkingMsg['@];

{
Test: SymTab.EachPairAction = {
symTabEntry: SymbolTableEntry _ NARROW[val];
newList: InstanceList _ symTabEntry.newList;
oldList: InstanceList _ symTabEntry.oldList;
FOR each: InstanceList _ newList, each.rest WHILE each # NIL DO
newArray[each.first.line] _ NEW[FileArrayEntryRep _ [
symEntry: symTabEntry,
instance: each,
otherIndex: -1,
node: each.first.node,
typeOfPntr: symTable,
len: each.first.len]];
ENDLOOP;
FOR each: InstanceList _ oldList, each.rest WHILE each # NIL DO
oldArray[each.first.line] _ NEW[FileArrayEntryRep _ [
symEntry: symTabEntry,
instance: each,
otherIndex: -1,
node: each.first.node,
typeOfPntr: symTable,
len: each.first.len]];
ENDLOOP;
RETURN[FALSE];
};
[] _ SymTab.Pairs[symbolTable, Test];
WorkingMsg['#];
};

EXITS emptyfile => {
FinishUp["At least one of these files is effectively empty."];
RETURN;
};
};

THROUGH [0..repeats) DO

{
Test: SymTab.EachPairAction = {
symTabEntry: SymbolTableEntry _ NARROW[val];
newList: InstanceList _ symTabEntry.newList;
oldList: InstanceList _ symTabEntry.oldList;
Process.CheckForAbort[];
SELECT TRUE FROM
newList = NIL, oldList = NIL => {};
newList.rest # NIL, oldList.rest # NIL => {
};
ENDCASE => {
indexO _ oldList.first.line;
indexN _ newList.first.line;
ConnectEntries[symTabEntry, indexO, indexN, oldArray[indexO], newArray[indexN]];
};
RETURN[FALSE];
};
[] _ SymTab.Pairs[symbolTable, Test];
WorkingMsg['$];
};

{
indexN _ 0;
WHILE indexN < totalNewLines DO
entry: FileArrayEntry = newArray[indexN];
Process.CheckForAbort[];
indexN _ indexN + 1;
IF entry.typeOfPntr = lineNum THEN {
indexO _ entry.otherIndex + 1;
WHILE indexN < totalNewLines AND indexO < totalOldLines DO
entryN: FileArrayEntry = newArray[indexN];
entryO: FileArrayEntry = oldArray[indexO];
symEntry: SymbolTableEntry _ entryN.symEntry;
SELECT TRUE FROM
entryN.typeOfPntr = symTable
AND entryO.typeOfPntr = symTable
AND symEntry = entryO.symEntry =>
ConnectEntries[symEntry, indexO, indexN, entryO, entryN];
entryN.typeOfPntr # lineNum
OR entryO.typeOfPntr # lineNum
OR entryN.otherIndex # indexO
OR entryO.otherIndex # indexN => EXIT;
ENDCASE;
indexN _ indexN + 1;
indexO _ indexO + 1;
ENDLOOP;
};
ENDLOOP;
WorkingMsg['%];
};

{
indexN _ totalNewLines - 1;
WHILE indexN >= 0 DO
entry: FileArrayEntry = newArray[indexN];
Process.CheckForAbort[];
indexN _ indexN - 1;
IF entry.typeOfPntr = lineNum THEN {
indexO _ entry.otherIndex - 1;
WHILE indexN >= 0 AND indexO >= 0 DO
entryN: FileArrayEntry = newArray[indexN];
entryO: FileArrayEntry = oldArray[indexO];
symEntry: SymbolTableEntry _ entryN.symEntry;
Process.CheckForAbort[];
SELECT TRUE FROM
entryN.typeOfPntr = symTable
AND entryO.typeOfPntr = symTable
AND symEntry = entryO.symEntry => {
ConnectEntries[symEntry, indexO, indexN, entryO, entryN];
};
entryN.typeOfPntr # lineNum
OR entryO.typeOfPntr # lineNum
OR entryN.otherIndex # indexO
OR entryO.otherIndex # indexN =>
EXIT;
ENDCASE;
indexN _ indexN - 1;
indexO _ indexO - 1;
ENDLOOP;
};
ENDLOOP;
WorkingMsg['~];
};

ENDLOOP;

{
CancelMatch: PROC [array1, array2: FileArray, totalNumOfLinesFile1, index: INT] = {
DO
entry1: FileArrayEntry _ array1[index];
IF entry1.typeOfPntr = symTable THEN EXIT;
entry1.typeOfPntr _ symTable;
array2[entry1.otherIndex].typeOfPntr _ symTable;
index _ index + 1;
IF ((index >= totalNumOfLinesFile1)
OR (entry1.otherIndex # array1[index - 1].otherIndex + 1)) THEN EXIT;
ENDLOOP;
};

IF switchLinesForMatch > 1 THEN {
indexN _ 0;
DO
oldIndexN: INT _ indexN;
indexN _ indexN + 1;
Process.CheckForAbort[];
IF indexN >= totalNewLines THEN EXIT;
IF newArray[indexN].typeOfPntr = lineNum THEN {
WHILE ((indexN < totalNewLines)
AND (newArray[indexN].otherIndex = newArray[indexN-1].otherIndex + 1)) DO
indexN _ indexN + 1;
ENDLOOP;
IF (indexN - oldIndexN) < switchLinesForMatch AND indexN < totalNewLines THEN
CancelMatch[newArray, oldArray, totalNewLines, oldIndexN];
};
ENDLOOP;
};
WorkingMsg['&];

{
LeadingNumber: PROC [char: CHAR, number: INT] = {
leadingZeroes: INTEGER _ columns - 1;
tempIndex: INT _ number;
IF switchMergeFiles THEN RETURN;
Process.CheckForAbort[];
difFile.PutF["%g/", [character[char]]];
DO
IF tempIndex < 10 THEN EXIT;
tempIndex _ tempIndex/10;
leadingZeroes _ leadingZeroes - 1;
ENDLOOP;
THROUGH [0..leadingZeroes) DO difFile.PutChar['0]; ENDLOOP;
difFile.Put[[integer[number]]];
difFile.PutRope[") "];
};
PrintDelta: PROC [file: REF, which: CHAR, entry: FileArrayEntry] = {
st: STREAM = NARROW[file];
pos: INT = entry.instance.first.pos;
LeadingNumber[which, pos];
IO.SetIndex[st, pos];
THROUGH [0..entry.len) DO
c: CHAR _ IO.GetChar[st ! IO.EndOfStream => EXIT];
IO.PutChar[difFile, c];
ENDLOOP;
IO.PutChar[difFile, '\n];
};
PrintCedarDelta: PROC [file: REF, index, start, total: INT, array: FileArray]
RETURNS [INT] = {
st: STREAM = NARROW[file];
IF start < total THEN {
leadChar: CHAR _ IF file = oldFile THEN '1 ELSE '2;
lastChar: CHAR _ 0C;
lastIndex: INT _ MIN[index+1, total] - 1;
lastEntry: FileArrayEntry = array[lastIndex];
pos: INT _ array[start].instance.first.pos;
end: INT _ lastEntry.instance.first.pos+lastEntry.instance.first.len;
WHILE pos > 0 DO
IO.SetIndex[st, pos - 1];
lastChar _ IO.GetChar[st];
IF IsEndOfLine[lastChar] THEN EXIT;
pos _ pos - 1;
ENDLOOP;
LeadingNumber[leadChar, pos];
IO.SetIndex[st, pos];
DO
lastChar _ IO.GetChar[st ! IO.EndOfStream => EXIT];
IF IsEndOfLine[lastChar]
THEN {
IF pos >= end THEN EXIT;
IO.PutChar[difFile, '\n];
LeadingNumber[leadChar, pos];
}
ELSE IO.PutChar[difFile, lastChar];
pos _ pos + 1;
ENDLOOP;
IO.PutChar[difFile, '\n];

WHILE index < total DO
IF array[index].instance.first.pos >= end THEN EXIT;
index _ index + 1;
ENDLOOP;
};
RETURN [index];
};
DumpOutDiffAndMoveAhead: PROC = {
IF NOT anyDifferencesSeen THEN {
OpenDifFileAndWriteHeader[];
difFile.PutF["%g%g\n", [rope[Asterisks]], [rope[Asterisks]]];
};
SELECT TRUE FROM
(indexN >= totalNewLines) OR (indexO >= totalOldLines) => {
indexN _ totalNewLines;
indexO _ totalOldLines;
};
newArray[indexN].typeOfPntr = lineNum =>
indexO _ newArray[indexN].otherIndex
ENDCASE =>
indexN _ oldArray[indexO].otherIndex;
SELECT pData FROM
$Cedar => {
indexO _ PrintCedarDelta[oldFile, indexO, startDifO, totalOldLines, oldArray];
difFile.PutF["%g\n", [rope[Asterisks]]];
indexN _ PrintCedarDelta[newFile, indexN, startDifN, totalNewLines, newArray];
};
ENDCASE => {
IF switchMergeFiles
THEN CopySpan[oldArray, startDifO, indexO-1, oldFile, old, totalOldLines]
ELSE {
FOR index: INT IN [startDifO..indexO) DO
entry: FileArrayEntry = oldArray[index];
PrintDelta[oldFile, '1, entry];
ENDLOOP;
FOR index: INT IN [indexO..indexO + switchLinesForContext)
WHILE (index < totalOldLines) DO
entry: FileArrayEntry = oldArray[index];
PrintDelta[oldFile, '1, entry];
ENDLOOP;
};
indexO _ indexO + switchLinesForContext;
difFile.PutF["%g\n", [rope[Asterisks]]];
IF switchMergeFiles
THEN CopySpan[newArray, startDifN, indexN-1, newFile, new, totalNewLines]
ELSE {
FOR index: INT IN [startDifN..indexN) DO
entry: FileArrayEntry = newArray[index];
PrintDelta[newFile, '2, entry];
ENDLOOP;
FOR index: INT IN [indexN..indexN + switchLinesForContext)
WHILE (index < totalNewLines) DO
entry: FileArrayEntry = newArray[index];
PrintDelta[newFile, '2, entry];
ENDLOOP;
};
indexN _ indexN + switchLinesForContext;
};

difFile.PutF["\n%g%g\n", [rope[Asterisks]], [rope[Asterisks]]];

IF switchMergeFiles THEN
CopySpan[newArray, indexN-switchLinesForContext, indexN-1, newFile, both, totalNewLines];

startDifN _ indexN;
WHILE indexN < totalNewLines AND newArray[indexN].typeOfPntr # symTable DO
IF newArray[indexN].otherIndex
# newArray[indexN - 1].otherIndex + 1 THEN EXIT;
indexN _ indexN + 1;
indexO _ indexO + 1;
ENDLOOP;

IF switchMergeFiles AND indexN>startDifN THEN
CopySpan[newArray, startDifN, indexN-1, newFile, both, totalNewLines];
startDifN _ indexN;
startDifO _ indexO;
};
TryToResolveConflicts: PROC [array1, array2: FileArray, index1, index2: INT]
RETURNS [okToDumpDiff: BOOL] = {
entry1: FileArrayEntry _ array1[index1];
lastRange1: INT _ index1 + entry1.otherIndex - index2;
FOR tempIndex: INT IN [index2..entry1.otherIndex) DO
entry2: FileArrayEntry _ array2[tempIndex];
IF entry2.typeOfPntr = lineNum THEN {
IF entry2.otherIndex > lastRange1
THEN CancelMatch[array2, array1, totalOldLines, tempIndex]
ELSE {
CancelMatch[array1, array2, totalNewLines, index1];
RETURN[FALSE];
};
};
ENDLOOP;
RETURN [TRUE];
};
CopySpan: PROC [array: FileArray, index1, index2: INT, in: REF, lineType: LineType _ both, limit: INT_-1] = {
inNode: Node = NARROW[in];
nesting: INT;
IF limit>=0 THEN { IF index1 >= limit THEN RETURN; index2 _ MIN[index2, limit-1]; };
IF index1>index2 THEN RETURN;
nesting _ TextNode.Level[array[index1].node] - TextNode.Level[difFileNode.node];
WHILE nesting > 1 DO
[]_EditSpan.Copy[difFileNode.root, fillerNode.root, TextNode.MakeNodeLoc[difFileNode.node], TextNode.MakeNodeSpan[fillerNode.node, fillerNode.node], after, 1];
nesting _ nesting - 1;
ENDLOOP;
[]_EditSpan.Copy[difFileNode.root, inNode.root, TextNode.MakeNodeLoc[difFileNode.node], TextNode.MakeNodeSpan[array[index1].node, array[index2].node], after, nesting];
IF lineType=both
THEN difFileNode.node _ TextNode.LastWithin[difFileNode.root]
ELSE {
node: TextNode.Ref;
WHILE (node_TextNode.StepForward[difFileNode.node])#NIL DO
len: INT = Rope.Length[TextNode.NodeRope[node]];
difFileNode.node _ node;
SELECT lineType FROM
old  => TiogaFileOps.AddLooks[FR[node], 0, len, 'y];
new => TiogaFileOps.AddLooks[FR[node], 0, len, 'z];
ENDCASE;
ENDLOOP;
};
};
startDifN: INT;
startDifO: INT;
dumpDiff: BOOL;
columns: NAT _ 1;
max: INT _ MAX[posInNewFile, posInOldFile];
DO
IF max < 10 THEN EXIT;
max _ max/10;
columns _ columns + 1;
ENDLOOP;
indexN _ 0;
indexO _ 0;
IF switchMergeFiles THEN OpenDifFileAndWriteHeader[];
DO
IF indexN >= totalNewLines OR indexO >= totalOldLines
THEN EXIT
ELSE {
entryN: FileArrayEntry _ newArray[indexN];
entryO: FileArrayEntry _ oldArray[indexO];
IF entryN.typeOfPntr # lineNum THEN EXIT;
IF entryO.typeOfPntr # lineNum THEN EXIT;
IF entryN.otherIndex # indexO THEN EXIT;
IF entryO.otherIndex # indexN THEN EXIT;
indexN _ indexN + 1;
indexO _ indexO + 1;
};
ENDLOOP;
IF switchMergeFiles AND indexN>0 THEN
CopySpan[newArray, 0, indexN-1, newFile, both];

startDifN _ indexN;
startDifO _ indexO;
dumpDiff _ FALSE;
WHILE ((indexN < totalNewLines) AND (indexO < totalOldLines)) DO
entryN: FileArrayEntry = newArray[indexN];
entryO: FileArrayEntry = oldArray[indexO];
IF entryN.typeOfPntr = lineNum OR entryO.typeOfPntr = lineNum THEN {
IF entryN.typeOfPntr = lineNum AND entryO.typeOfPntr = lineNum THEN {
IF entryN.otherIndex = indexO AND entryO.otherIndex = indexN THEN GOTO dumpoutthedifference;
IF (entryN.otherIndex - indexO) > (entryO.otherIndex - indexN)
THEN CancelMatch[newArray, oldArray, totalNewLines, indexN]
ELSE CancelMatch[oldArray, newArray, totalOldLines, indexO];
};
IF entryN.typeOfPntr = lineNum 
THEN dumpDiff _ TryToResolveConflicts[newArray, oldArray, indexN, indexO]
ELSE dumpDiff _ TryToResolveConflicts[oldArray, newArray, indexO, indexN];
EXITS dumpoutthedifference => dumpDiff _ TRUE;
};
IF dumpDiff
THEN {
DumpOutDiffAndMoveAhead[];
dumpDiff _ FALSE;
}
ELSE {
indexN _ indexN + 1;
indexO _ indexO + 1;
};
ENDLOOP;
IF startDifN < totalNewLines OR startDifO < totalOldLines THEN
DumpOutDiffAndMoveAhead[];
WorkingMsg['*];
IF switchMergeFiles THEN TiogaFileOps.Store[FR[difFileNode.root], difFileName];
};

IF anyDifferencesSeen
THEN FinishUp[Rope.Cat[IF switchMergeFiles THEN "merged version written on file " ELSE " differences written on file ", difFileName, ".\n"]]
ELSE {FinishUp[" no differences encountered.\n"]; result _ $NoAction};

IF ~switchMergeFiles THEN {
IO.Close[NARROW[oldFile]];
IO.Close[NARROW[newFile]];
}
};

EXITS
usageError => {msg _ "Usage error: Waterlily file1 file2\n"; result _ $Failure};
fatalError => {result _ $Failure};

};

ShortName: PROC [name: ROPE] RETURNS [ROPE] = {
bang: INT _ Rope.Length[name];
pos: INT _ bang;
WHILE (pos _ pos - 1) > 0 DO
SELECT Rope.Fetch[name, pos] FROM
'>, '/, '] => {pos _ pos + 1; EXIT};
'!, '. => bang _ pos;
ENDCASE;
ENDLOOP;
RETURN [Rope.Flatten[name, pos, bang - pos]];
};

DefaultExtension: PROC [name: ROPE, ext: ROPE, forceExt: BOOL] RETURNS [ROPE] = {
len: INT _ Rope.Length[name];
pos: INT _ len;
WHILE (pos _ pos - 1) > 0 DO
SELECT Rope.Fetch[name, pos] FROM
'>, '/, '] => EXIT;
'., '! => RETURN [name];
ENDCASE;
ENDLOOP;
IF forceExt THEN RETURN[Rope.Concat[name, ext]];
[] _ FS.FileInfo[name ! FS.Error => GOTO NoFile];
RETURN [name]; -- if file exists, don't change its name
EXITS NoFile => RETURN[Rope.Concat[name, ext]];
};


TR: PROC[ref: REF] RETURNS [TextNode.Ref] = TRUSTED INLINE {
RETURN[LOOPHOLE[ref]]; };

FR: PROC[ref: REF] RETURNS [TiogaFileOps.Ref] = TRUSTED INLINE {
RETURN[LOOPHOLE[ref]]; };

NewNode: PROC RETURNS [node: Node] = {
node _ NEW[NodeBody _ [TR[TiogaFileOps.CreateRoot[]]]];
node.node _ node.root;
NodeProps.PutProp[n: NARROW[node.root, TextNode.Ref], name: $NewlineDelimiter, value: Rope.Flatten["\n"]];
};

NodeFromFile: PROC[fileName: ROPE] RETURNS [node: Node] = {
node _ NEW[NodeBody _ []];
node.root _ PutGet.FromFile[fileName];
node.node _ node.root;
};

IsEndOfLine: PROC [c: CHAR] RETURNS [BOOL] = INLINE {
RETURN [c = '\n OR c = 015C OR c = 012C];
};

Commander.Register[key: "Waterlily", proc: WaterlilyProc, doc: LongHelpMsgW, clientData: NIL];
Commander.Register[key: "Cedarlily", proc: WaterlilyProc, doc: LongHelpMsgC, clientData: $Cedar];
Commander.Register[key: "Tigerlily",
proc: WaterlilyProc, doc: LongHelpMsgM, clientData: $Merge];
Commander.Register[key: "MergeLily",
proc: WaterlilyProc, doc: LongHelpMsgM, clientData: $Merge]; -- The old name
}.







Waterlily.mesa
Copyright Ó 1984, 1985, 1988, 1991 by Xerox Corporation.  All rights reserved.
Swinehart, November 18, 1985 2:35:32 pm PST
Russ Atkinson (RRA) December 17, 1991 7:43 pm PST
Last tweaked by Mike Spreitzer on October 17, 1988 4:48:07 pm PDT
Bill Jackson (bj) November 17, 1988 5:14:01 pm PST
Jules Bloomenthal August 5, 1991 12:21 pm PDT
Michael Plass, February 21, 1991 9:56 am PST
Willie-s, February 17, 1992 12:51 pm PST
Part of this algorithm cribbed from Heckel, Paul.  A Technique For Isolating Differences Between Files.  Comm. ACM 21,4 (April 1978), 264-268.  Pointer to which courtesy of Ed Taft.

Make this greater to experiment with multiple phases of match finding
Turn this on to get different characters for different phases of the process.
PROC [cmd: Handle] RETURNS [result: REF _ NIL, msg: ROPE _ NIL];
these switches are global or local.
these switches are global only.
We need a new buffer
We are at the end of the stream.  If the token is empty, then raise EndOfStream.
Special processing for Cedar tokens
Now do a little canonicalization to avoid reporting meaningless differences.
Semicolons are quite common, but not very important, and are often optional.  So we can safely ignore them.
This may just be the end of the interesting part of the file.
This may just be the end of the interesting part of the file.
This is an interesting little hack.  It tends to improve token uniqueness by appending the peek character, tends to reduce the number of tokens in the table (by swallowing lots of single-character tokens), and thereby improves matching.
Character code finesse
Character code finesse
We only get here when we are using full lines as tokens.
Here we process the token to make it canonical
start here.
Process arguments
Switches specified here
The old file name is really the dif file name
Pass 1 & 2
Pass 1
In Pass 1 we scan the new file (the second one mentioned in the command line) for lines (or tokens), and enter them into the symbol table.
Pass 2
Pass 2 is like Pass1, except that we are scanning the old file (the first one mentioned in the command line).
Pass 3
In Pass 3 we transform all of the instances into file array entries.
[key: SymTab.Key, val: SymTab.Val] RETURNS [quit: BOOL]
Pass 4
In Pass 4 we run through the symbol table to connect all lines (or tokens) that appear only once in both files (OR appear once with a given peek char).  Those lines (or tokens) are the places where the files are known to coincide.
[key: SymTab.Key, val: SymTab.Val] RETURNS [quit: BOOL]
Pass 5
In Pass 5 we extend matching entries outwards by scanning forwards.
Pass 6
In Pass 6 we extend matching entries outwards by scanning backwards.
Passes 7 and 8
Pass 7
In Pass 7 we cancel matches that don't extend far enough.  This is to prevent excessive context switching in reporting differences.
Pass 8
In Pass 8 we actually print the differences, skipping over the matches.
must be a better way to do this.
Dump out the line indicated by the entry
Dump out the difference indicated, extending the difference through the start of the line containing the first token, and through the end of the line containing the last token.  Return the index after the last token on the last line printed.
First, get to the preceding line start by scanning backwards
Now, put out lines until the rem count is exhausted
Now skip over tokens we inadvertently covered during our printing to the end of line.  The index returned is the one after the one we printed.
If merging, print the context lines here.
Move ahead to get beyond the last line from the old file.
Node Management

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