DFUtilitiesImpl.mesa
Copyright © 1984, 1985 by Xerox Corporation. All rights reserved.
Levin on December 7, 1983 11:00 am
Russ Atkinson, March 19, 1985 1:21:01 pm PST
Doug Wyatt, December 28, 1984 3:57:57 pm PST (add UsingToken in ParseFromStream)
DIRECTORY
Ascii USING [CR, SP, TAB],
BasicTime USING [minutesPerHour, nullGMT, OutOfRange, Pack, TimeParametersNotKnown, Unpacked, Unpack, unspecifiedZone],
DFUtilities USING [CommentItem, Date, DirectoryItem, FileItem, Filter, FilterA, FilterB, FilterC, ImportsItem, IncludeItem, ProcessItemProc, SupplyItemProc, UsingEntry, UsingForm, UsingList, WhiteSpaceItem],
IO USING [Backup, BreakProc, EndOfStream, Error, GetChar, GetLineRope, GetToken, GetUnpackedTime, PeekChar, PutChar, PutF, PutFR, PutRope, STREAM, TokenProc],
RefText USING [Equal, Fetch, Length, ObtainScratch, ReleaseScratch, TrustTextAsRope],
Rope USING [Compare, Concat, Fetch, FromRefText, InlineFetch, Length, ROPE, Run, Substr];
DFUtilitiesImpl:
CEDAR
PROGRAM
IMPORTS BasicTime, IO, RefText, Rope
EXPORTS DFUtilities = BEGIN
ROPE: TYPE = Rope.ROPE;
STREAM: TYPE = IO.STREAM;
Exported Procedures
ParseFromStream:
PUBLIC
PROC [in:
STREAM, proc: DFUtilities.ProcessItemProc, filter: DFUtilities.Filter ← []] = {
Abort: ERROR = CODE;
ParseInner:
PROC = {
passFileItems: BOOL ← TRUE;
underDirectory: BOOL ← FALSE;
blankLineCount: NAT ← 0;
bufferT is used for terminals, like "Directory". bufferN is used for non-terminals, like file names, dates, and the like. Separate buffers are used to simplify the REF TEXT handling by clients of GetTokenAsRefText. They are not released if ParseInner exits with an uncaught signal, but this is claimed to be OK.
bufferT: REF TEXT = RefText.ObtainScratch[20];
bufferN: REF TEXT = RefText.ObtainScratch[100];
SimpleToken:
IO.BreakProc
-- [char: CHAR] RETURNS [IO.CharClass] -- = {
SELECT char
FROM
Ascii.SP, Ascii.TAB => RETURN[$sepr];
Ascii.CR => RETURN[$break];
ENDCASE => RETURN[$other];
};
UsingToken:
IO.BreakProc
-- [char: CHAR] RETURNS [IO.CharClass] -- = {
SELECT char
FROM
'- => RETURN[$other];
ENDCASE => RETURN[IO.TokenProc[char]];
};
GetTokenAsRefText:
PROC [breakProc:
IO.BreakProc]
RETURNS [token: REF TEXT ← "\N"] = {
token ← in.GetToken[breakProc, bufferT ! IO.EndOfStream => CONTINUE].token;
};
GetToken:
PROC [breakProc:
IO.BreakProc]
RETURNS [
ROPE] = {
token: REF TEXT ← "\N";
token ← in.GetToken[breakProc, bufferN ! IO.EndOfStream => CONTINUE].token;
RETURN[Rope.FromRefText[token]]
};
PutBack:
PROC [x:
REF
TEXT] = {
FOR i:
INT
DECREASING
IN [0..RefText.Length[x])
DO
in.Backup[RefText.Fetch[x, i]];
ENDLOOP;
};
EndOfLineText:
PROC [t:
REF
TEXT]
RETURNS [
BOOL] = {
RETURN[RefText.Length[t] = 1 AND RefText.Fetch[t, 0] = Ascii.CR]
};
EndOfLineRope:
PROC [t:
ROPE]
RETURNS [
BOOL] = {
RETURN[t.Length[] = 1 AND t.Fetch[0] = Ascii.CR]
};
CheckEndOfLine:
PROC = {
IF ~EndOfLineText[GetTokenAsRefText[SimpleToken]]
THEN
ERROR SyntaxError["Unrecognizable text where end-of-line was expected."];
};
FlushWhiteSpace:
PROC = {
IF blankLineCount ~= 0
AND filter.comments
THEN {
IF proc[NEW[DFUtilities.WhiteSpaceItem ← [lines: blankLineCount]]] THEN ERROR Abort;
CancelWhiteSpace[];
};
};
CancelWhiteSpace: PROC = {blankLineCount ← 0};
CancelDirectory: PROC = {underDirectory ← FALSE};
GetDate:
PROC
RETURNS [DFUtilities.Date] = {
DO
char: CHAR = in.GetChar[ ! IO.EndOfStream => GO TO omitted];
SELECT char
FROM
Ascii.SP, Ascii.TAB => NULL; -- leading white space
Ascii.CR => {in.Backup[char]; GO TO omitted};
'# => RETURN[[$notEqual, BasicTime.nullGMT]];
'~ =>
IF in.GetChar[] = '= THEN RETURN[[$notEqual, BasicTime.nullGMT]]
ELSE GO TO bogus;
'> => RETURN[[$greaterThan, BasicTime.nullGMT]];
ENDCASE => {
up: BasicTime.Unpacked;
in.Backup[char];
up ← in.GetUnpackedTime[ ! IO.Error => GO TO bogus];
Since GetUnpackedTime didn't raise Error, we must have either a complete date or a complete time (with or without zone) or both. We want to complain unless both were specified. Therefore, it suffices to test one field each of the date and time for "out-of-bounds" values.
IF up.year = 0
OR up.hour = 24
OR
up.zone = BasicTime.unspecifiedZone OR up.dst = unspecified THEN GO TO bogus;
RETURN[[$explicit, BasicTime.Pack[unpacked: up]]]
};
ENDLOOP;
EXITS
omitted => RETURN[[$omitted, BasicTime.nullGMT]];
bogus => ERROR SyntaxError["Illegal date specification."];
};
ParseDirectoryItem:
PROC [exported:
BOOL, readOnly:
BOOL, path1:
ROPE ←
NIL]
RETURNS [
REF DFUtilities.DirectoryItem] = {
directoryFilterB: DFUtilities.FilterB = IF exported THEN $public ELSE $private;
directoryFilterC: DFUtilities.FilterC = IF readOnly THEN $imported ELSE $defining;
ConsiderDefiningInstance:
PROC
RETURNS [
BOOL] = {
RETURN[
(filter.filterB = $all OR filter.filterB = directoryFilterB) AND
(filter.filterC = $all OR filter.filterC = directoryFilterC)
];
};
path2: ROPE ← NIL;
path2IsCameFrom: BOOL ← FALSE;
x: REF TEXT;
IF path1 =
NIL
AND EndOfLineRope[path1 ← GetToken[SimpleToken]]
THEN
ERROR SyntaxError["Missing directory path."];
IF ~EndOfLineText[x ← GetTokenAsRefText[SimpleToken]]
THEN {
SELECT
TRUE
FROM
RefText.Equal[x, "ReleaseAs", FALSE] => path2IsCameFrom ← FALSE;
RefText.Equal[x, "CameFrom", FALSE] => path2IsCameFrom ← TRUE;
ENDCASE => ERROR SyntaxError["Unrecognized construct following directory path."];
IF EndOfLineRope[path2 ← GetToken[SimpleToken]]
THEN
RaiseSyntaxError["Missing directory path following", x];
CheckEndOfLine[];
};
underDirectory ← TRUE;
RETURN[
IF (passFileItems ← ConsiderDefiningInstance[])
THEN
NEW[DFUtilities.DirectoryItem ← [
path1: path1,
path2: path2,
path2IsCameFrom: path2IsCameFrom,
exported: exported,
readOnly: readOnly
]]
ELSE NIL
]
};
ParseFileItem:
PROC [verifyRoot:
BOOL ←
FALSE, name:
ROPE ←
NIL]
RETURNS [
REF DFUtilities.FileItem] = {
PassesNameFilter:
PROC [file:
ROPE]
RETURNS [
BOOL] = {
SELECT
TRUE
FROM
filter.list # NIL => {};
filter.filterA = $all => {};
ClassifyFileExtension[file] = filter.filterA => {};
ENDCASE => RETURN[FALSE];
RETURN[SearchUsingList[file, filter.list].found]
};
date: DFUtilities.Date;
IF ~underDirectory THEN ERROR SyntaxError["Missing directory statement"];
IF name =
NIL
AND EndOfLineRope[name ← GetToken[SimpleToken]]
THEN
ERROR SyntaxError["Missing file name."];
date ← GetDate[];
CheckEndOfLine[];
RETURN[
IF passFileItems
AND PassesNameFilter[RemoveVersionNumber[name]]
THEN
NEW[DFUtilities.FileItem ← [
name: name,
date: date,
verifyRoot: verifyRoot
]]
ELSE NIL
]
};
ParseImportsItem:
PROC [exported:
BOOL]
RETURNS [
REF DFUtilities.ImportsItem] = {
x: REF TEXT;
path1, path2: ROPE ← NIL;
date: DFUtilities.Date;
form: DFUtilities.UsingForm ← $exports;
list: REF DFUtilities.UsingList ← NIL;
ConsiderImports:
PROC
RETURNS [
BOOL] = {
IF filter.filterC = $defining THEN RETURN[FALSE];
IF exported
AND filter.list #
NIL
THEN {
RRA sez: we should consider the imports of any imports item being exported when there is an explicit filter list. Of course, if there is a null intersection (list = NIL), we don't have to consider it unless the form dictates it.
RETURN [form = $all OR form = $exports OR list # NIL];
};
SELECT filter.filterB
FROM
$private => IF exported OR form = $exports THEN RETURN[FALSE];
$public => IF ~exported THEN RETURN[FALSE];
ENDCASE;
RETURN[~(form = $list AND list = NIL)]
};
IF EndOfLineRope[path1 ← GetToken[SimpleToken]]
THEN
ERROR SyntaxError["Missing file name."];
IF EndOfLineText[x ← GetTokenAsRefText[SimpleToken]]
OR
~RefText.Equal[x, "Of", FALSE] THEN
ERROR SyntaxError["Missing 'Of' following DF name"];
date ← GetDate[];
CheckEndOfLine[];
x ← GetTokenAsRefText[SimpleToken];
IF RefText.Equal[x, "CameFrom",
FALSE]
THEN {
IF EndOfLineRope[path2 ← GetToken[SimpleToken]]
THEN
RaiseSyntaxError["Missing directory path following", x];
CheckEndOfLine[];
x ← GetTokenAsRefText[SimpleToken];
};
IF RefText.Equal[x, "Using",
FALSE]
THEN {
x ← GetTokenAsRefText[UsingToken];
SELECT
TRUE
FROM
RefText.Equal[x, "All", FALSE] => form ← $all;
RefText.Equal[x, "Exports", FALSE] => --form ← $exports-- NULL;
RefText.Equal[x, "[",
FALSE] => {
verifyRoot: BOOL ← FALSE;
form ← $list;
DO
index: NAT;
inList: BOOL;
x ← GetTokenAsRefText[UsingToken];
IF RefText.Length[x] = 1
THEN
SELECT RefText.Fetch[x, 0]
FROM
'] => EXIT;
'+ =>
IF ~verifyRoot THEN {verifyRoot ← TRUE; LOOP}
ELSE ERROR SyntaxError["Illegally placed '+' in 'Using' list."];
ENDCASE;
[inList, index] ← SearchUsingList[RefText.TrustTextAsRope[x], filter.list];
IF inList
THEN {
enter name in list
SELECT
TRUE
FROM
list =
NIL => {
length: NAT = IF filter.list = NIL THEN 20 ELSE filter.list.nEntries;
list ← NEW[DFUtilities.UsingList[length]];
list.nEntries ← 0;
};
list.nEntries = list.length => {
This case can only happen if filter.list = NIL
newList: REF DFUtilities.UsingList ← NEW[DFUtilities.UsingList[(list.length*3)/2]];
newList.nEntries ← list.nEntries;
FOR i:
NAT
IN [0..list.nEntries)
DO
newList.u[i] ← list.u[i];
ENDLOOP;
list ← newList;
};
ENDCASE;
list.u[list.nEntries] ← [
verifyRoot: verifyRoot,
name:
IF filter.list = NIL THEN Rope.FromRefText[x]
ELSE filter.list.u[index].name
];
list.nEntries ← list.nEntries.SUCC;
};
verifyRoot ← FALSE;
ENDLOOP;
};
ENDCASE => ERROR SyntaxError["Unrecognized construct following 'Using'."];
CheckEndOfLine[];
}
ELSE {
PutBack[x];
--form ← $exports--
};
CancelDirectory[];
RETURN [
IF ConsiderImports[]
THEN
NEW[DFUtilities.ImportsItem ← [
path1: path1,
date: date,
path2: path2,
exported: exported,
form: form,
list: list
]]
ELSE NIL
]
};
ParseIncludeItem:
PROC
RETURNS [
REF DFUtilities.IncludeItem] = {
item:
REF DFUtilities.IncludeItem =
NEW[DFUtilities.IncludeItem ← [
path1: GetToken[SimpleToken],
date: ,
path2: NIL,
path2IsCameFrom:
]];
x: REF TEXT;
IF EndOfLineRope[item.path1] THEN ERROR SyntaxError["Missing file name."];
IF EndOfLineText[x ← GetTokenAsRefText[SimpleToken]]
OR
~RefText.Equal[x, "Of", FALSE] THEN
ERROR SyntaxError["Missing 'Of' following DF name"];
item.date ← GetDate[];
CheckEndOfLine[];
x ← GetTokenAsRefText[SimpleToken];
SELECT
TRUE
FROM
RefText.Equal[x, "ReleaseAs", FALSE] => item.path2IsCameFrom ← FALSE;
RefText.Equal[x, "CameFrom", FALSE] => item.path2IsCameFrom ← TRUE;
ENDCASE => {PutBack[x]; RETURN[item]};
IF EndOfLineRope[item.path2 ← GetToken[SimpleToken]]
THEN
RaiseSyntaxError["Missing directory path following", x];
CheckEndOfLine[];
CancelDirectory[];
RETURN[item]
};
Main parsing loop
DO
item: REF ANY ← NIL;
char: CHAR = in.GetChar[ ! IO.EndOfStream => EXIT];
SELECT char
FROM
Ascii.SP, Ascii.TAB => LOOP; -- leading white space on line
Ascii.
CR => {
blank line
IF filter.comments THEN blankLineCount ← blankLineCount.SUCC;
LOOP
};
'+ => {
FlushWhiteSpace[];
item ← ParseFileItem[verifyRoot: TRUE];
};
'- => {
FlushWhiteSpace[];
IF in.PeekChar[] = '-
THEN {
Comment line
comment: ROPE = Rope.Concat["-", in.GetLineRope[]];
IF filter.comments THEN item ← NEW[DFUtilities.CommentItem ← [text: comment]];
}
ELSE {in.Backup[char]; item ← ParseFileItem[]};
};
'/ => {
Remove this code when old-style comments are no longer supported.
FlushWhiteSpace[];
IF in.GetChar[] = '/
THEN {
comment: ROPE ← NIL;
comment ← in.GetLineRope[ ! IO.EndOfStream => CONTINUE];
convert to new style
IF filter.comments
THEN
item ← NEW[DFUtilities.CommentItem ← [text: Rope.Concat["--", comment]]];
}
ELSE ERROR SyntaxError["'/' is illegal at the start of a line."];
};
ENDCASE => {
x: REF TEXT;
in.Backup[char];
x ← GetTokenAsRefText[SimpleToken];
SELECT
TRUE
FROM
RefText.Equal[x, "Directory",
FALSE] =>
item ← ParseDirectoryItem[exported: FALSE, readOnly: FALSE];
RefText.Equal[x, "ReadOnly",
FALSE] =>
item ← ParseDirectoryItem[exported: FALSE, readOnly: TRUE];
RefText.Equal[x, "Imports", FALSE] => item ← ParseImportsItem[exported: FALSE];
RefText.Equal[x, "Include", FALSE],
RefText.Equal[x, "Includes", FALSE] => item ← ParseIncludeItem[];
RefText.Equal[x, "Exports",
FALSE] => {
IF EndOfLineText[x ← GetTokenAsRefText[SimpleToken]]
THEN
ERROR SyntaxError["Missing directory path following 'Exports'."];
SELECT
TRUE
FROM
RefText.Equal[x, "Directory",
FALSE] =>
item ← ParseDirectoryItem[exported: TRUE, readOnly: FALSE];
RefText.Equal[x, "ReadOnly",
FALSE] =>
item ← ParseDirectoryItem[exported: TRUE, readOnly: TRUE];
RefText.Equal[x, "Imports",
FALSE] =>
item ← ParseImportsItem[exported: TRUE];
ENDCASE =>
item ← ParseDirectoryItem[
exported: TRUE, readOnly: FALSE, path1: Rope.FromRefText[x]];
};
ENDCASE => item ← ParseFileItem[name: Rope.FromRefText[x]];
};
IF item ~=
NIL
THEN {
FlushWhiteSpace[];
IF proc[item] THEN ERROR Abort;
}
ELSE CancelWhiteSpace[];
ENDLOOP;
RefText.ReleaseScratch[bufferN];
RefText.ReleaseScratch[bufferT];
};
SortUsingList[usingList: filter.list, nearlySorted: TRUE];
ParseInner[ !
Abort => CONTINUE;
IO.EndOfStream => ERROR SyntaxError["Unexpected end of DF."];
IO.Error => ERROR SyntaxError[NIL];
]
};
SyntaxError:
PUBLIC
ERROR [reason:
ROPE] =
CODE;
WriteToStream:
PUBLIC
PROC [out:
STREAM, proc: DFUtilities.SupplyItemProc] = {
haveDirectory: BOOL ← FALSE;
DO
item: REF ANY = proc[];
IF item = NIL THEN EXIT;
WITH item
SELECT
FROM
directory: REF DFUtilities.DirectoryItem => haveDirectory ← TRUE;
file:
REF DFUtilities.FileItem =>
IF ~haveDirectory
THEN
ERROR SyntaxError["File item without preceding Directory item."];
imports: REF DFUtilities.ImportsItem => haveDirectory ← FALSE;
include: REF DFUtilities.IncludeItem => haveDirectory ← FALSE;
ENDCASE;
WriteItemToStream[out, item];
ENDLOOP;
};
WriteItemToStream:
PUBLIC
PROC [out:
STREAM, item:
REF
ANY] = {
maxUsingLineLength: INT = 90;
maxReasonableFileNameLength: INT = 45;
WITH item
SELECT
FROM
directory:
REF DFUtilities.DirectoryItem => {
IF directory.exported THEN out.PutRope["Exports "];
IF directory.readOnly THEN out.PutRope["ReadOnly "];
IF ~(directory.exported OR directory.readOnly) THEN out.PutRope["Directory "];
out.PutRope[directory.path1];
};
file:
REF DFUtilities.FileItem => {
out.PutRope[" "];
out.PutChar[IF file.verifyRoot THEN '+ ELSE Ascii.SP];
out.PutRope[file.name];
THROUGH [0..
MAX[maxReasonableFileNameLength-file.name.Length[], 1])
DO
out.PutChar[Ascii.SP];
ENDLOOP;
DateToStream[out, file.date];
};
imports:
REF DFUtilities.ImportsItem => {
IF imports.exported THEN out.PutRope["Exports "];
out.PutRope["Imports "];
out.PutRope[imports.path1];
out.PutRope[" Of "];
DateToStream[out, imports.date];
SELECT imports.form
FROM
When compatibility is no longer needed, replace the following NULL with
out.PutRope["\N Using Exports"]
exports => NULL;
all => out.PutRope["\N Using All"];
list => {
intro: ROPE = "\N Using [";
charsOnLine: INT ← intro.Length[].PRED;
out.PutRope[intro];
IF imports.list ~=
NIL
THEN {
FOR i:
NAT
IN [0..imports.list.nEntries)
DO
The following is an approximate check; the line may get a bit longer than `maxUsingLineLength'.
entry: DFUtilities.UsingEntry = imports.list.u[i];
IF charsOnLine + entry.name.Length[] > maxUsingLineLength
THEN {
indent: ROPE = "\N ";
IF i ~= 0 THEN out.PutChar[',];
out.PutRope[indent];
charsOnLine ← indent.Length[].PRED;
}
ELSE
IF i ~= 0 THEN {out.PutRope[", "]; charsOnLine ← charsOnLine + 2};
IF entry.verifyRoot THEN {out.PutChar['+]; charsOnLine ← charsOnLine.SUCC};
out.PutRope[entry.name];
charsOnLine ← charsOnLine + entry.name.Length[];
ENDLOOP;
};
out.PutChar[']];
};
ENDCASE;
};
include:
REF DFUtilities.IncludeItem => {
out.PutRope["Include "];
out.PutRope[include.path1];
out.PutRope[" Of "];
DateToStream[out, include.date];
};
comment:
REF DFUtilities.CommentItem =>
out.PutRope[comment.text];
whiteSpace:
REF DFUtilities.WhiteSpaceItem =>
THROUGH [0..whiteSpace.lines-1) DO out.PutChar[Ascii.CR]; ENDLOOP;
ENDCASE => ERROR SyntaxError["Unrecognizable item."];
out.PutChar[Ascii.CR];
};
SortUsingList:
PUBLIC
PROC [usingList:
REF DFUtilities.UsingList, nearlySorted:
BOOL ←
FALSE] = {
IF usingList = NIL THEN RETURN;
IF nearlySorted
THEN {
Insertion sort
FOR i:
NAT
IN [1..usingList.nEntries)
DO
item: DFUtilities.UsingEntry = usingList.u[i];
j: NAT ← i; -- 'j' can't be a loop control variable; we want its value on termination.
WHILE Rope.Compare[item.name, usingList.u[j-1].name,
FALSE] = less
DO
usingList.u[j] ← usingList.u[j-1];
IF (j ← j.PRED) = 0 THEN EXIT;
ENDLOOP;
IF j ~= i THEN usingList.u[j] ← item; -- test avoids unnecessary reference counting.
ENDLOOP;
}
ELSE {
Heap sort
SiftUp:
PROC [low, high:
NAT] = {
k: NAT ← low;
DO
twoK: NAT = k*2;
son: NAT ← twoK;
IF twoK > high THEN EXIT;
IF twoK+1 <= high AND Rope.Compare[usingList.u[twoK+1-1].name, usingList.u[twoK-1].name, FALSE] ~= less THEN son ← twoK+1;
IF Rope.Compare[usingList.u[son-1].name, usingList.u[k-1].name, FALSE] = less THEN EXIT;
Exchange[son-1, k-1];
k ← son;
ENDLOOP;
};
Exchange:
PROC [a, b:
NAT] = {
temp: DFUtilities.UsingEntry = usingList.u[a];
usingList.u[a] ← usingList.u[b];
usingList.u[b] ← temp;
};
FOR i:
NAT
DECREASING
IN [1..usingList.nEntries/2]
DO
SiftUp[i, usingList.nEntries];
ENDLOOP;
FOR i:
NAT
DECREASING
IN [1..usingList.nEntries)
DO
Exchange[0, i];
SiftUp[1, i];
ENDLOOP;
};
};
SearchUsingList:
PUBLIC
PROC [file:
ROPE, list:
REF DFUtilities.UsingList]
RETURNS [found:
BOOL ←
FALSE, index:
NAT] = {
Do a binary search for "file" in "list".
IF list = NIL THEN found ← TRUE -- NIL list is interpreted as "everything"
ELSE {
low: INTEGER ← 0;
high: INTEGER ← list.nEntries.PRED;
UNTIL low > high
DO
probe: NAT ← (low + high) / 2;
SELECT file.Compare[list.u[probe].name,
FALSE]
FROM
equal => RETURN[TRUE, probe];
less => IF probe = 0 THEN EXIT ELSE high ← probe.PRED;
greater => IF probe = list.nEntries.PRED THEN EXIT ELSE low ← probe.SUCC;
ENDCASE;
ENDLOOP;
found ← FALSE;
};
};
DifferenceOfUsingLists:
PUBLIC
PROC [a, b:
REF DFUtilities.UsingList]
RETURNS [diff:
REF DFUtilities.UsingList] = {
aI, bI: NAT ← 0;
aL: NAT = a.nEntries;
bL: NAT = b.nEntries;
diff ← NEW[DFUtilities.UsingList[a.nEntries]];
diff.nEntries ← 0;
UNTIL aI = aL
OR bI = bL
DO
SELECT a.u[aI].name.Compare[b.u[bI].name,
FALSE]
FROM
equal => {aI ← aI.SUCC; bI ← bI.SUCC};
less => {
diff.u[diff.nEntries] ← a.u[aI];
diff.nEntries ← diff.nEntries.SUCC;
aI ← aI.SUCC;
};
greater => bI ← bI.SUCC;
ENDCASE;
ENDLOOP;
UNTIL aI = aL
DO
diff.u[diff.nEntries] ← a.u[aI];
diff.nEntries ← diff.nEntries.SUCC;
aI ← aI.SUCC;
ENDLOOP;
};
DateToRope:
PUBLIC
PROC [date: DFUtilities.Date]
RETURNS [
ROPE ←
NIL] = {
SELECT date.format
FROM
$explicit => {
months: ROPE = "JanFebMarAprMayJunJulAugSepOctNovDec";
up: BasicTime.Unpacked = BasicTime.Unpack[date.gmt
! BasicTime.OutOfRange, BasicTime.TimeParametersNotKnown => GO TO noDate];
ConvertZone:
PROC
RETURNS [
ROPE] = {
dst: BOOL = up.dst = yes;
SELECT up.zone
FROM
0 => IF ~dst THEN RETURN["GMT"];
NAT[5*BasicTime.minutesPerHour] => RETURN[IF dst THEN "EDT" ELSE "EST"];
NAT[6*BasicTime.minutesPerHour] => RETURN[IF dst THEN "CDT" ELSE "CST"];
NAT[7*BasicTime.minutesPerHour] => RETURN[IF dst THEN "MDT" ELSE "MST"];
NAT[8*BasicTime.minutesPerHour] => RETURN[IF dst THEN "PDT" ELSE "PST"];
ENDCASE;
RETURN[
IO.PutFR["%g%02d%02d",
[character[IF up.zone < 0 THEN '- ELSE '+]],
[cardinal[up.zone.ABS/BasicTime.minutesPerHour]],
[cardinal[up.zone.ABS MOD BasicTime.minutesPerHour]]
]
]
};
RETURN[
IO.PutFR[
"%02d-%g-%02d %g",
[cardinal[up.day]],
[rope[months.Substr[start: up.month.ORD*3, len: 3]]],
[cardinal[up.year MOD 100]],
[rope[
IO.PutFR[
"%02d:%02d:%02d %g",
[cardinal[up.hour]], [cardinal[up.minute]], [cardinal[up.second]],
[rope[ConvertZone[]]]
]]]
]
]
};
$notEqual => RETURN["~="];
$greaterThan => RETURN[">"];
ENDCASE;
};
DateToStream:
PUBLIC
PROC [s:
STREAM, date: DFUtilities.Date] = {
SELECT date.format
FROM
$explicit => {
months: ROPE = "JanFebMarAprMayJunJulAugSepOctNovDec";
up: BasicTime.Unpacked = BasicTime.Unpack[date.gmt
! BasicTime.OutOfRange, BasicTime.TimeParametersNotKnown => GO TO noDate];
ConvertZone:
PROC = {
dst: BOOL = up.dst = yes;
SELECT up.zone
FROM
0 => IF ~dst THEN s.PutRope["GMT"];
NAT[5*BasicTime.minutesPerHour] => s.PutRope[IF dst THEN "EDT" ELSE "EST"];
NAT[6*BasicTime.minutesPerHour] => s.PutRope[IF dst THEN "CDT" ELSE "CST"];
NAT[7*BasicTime.minutesPerHour] => s.PutRope[IF dst THEN "MDT" ELSE "MST"];
NAT[8*BasicTime.minutesPerHour] => s.PutRope[IF dst THEN "PDT" ELSE "PST"];
ENDCASE =>
s.PutF["%g%02d%02d",
[character[IF up.zone < 0 THEN '- ELSE '+]],
[cardinal[up.zone.ABS/BasicTime.minutesPerHour]],
[cardinal[up.zone.ABS MOD BasicTime.minutesPerHour]]
]
};
s.PutF["%02d-%g-%02d ",
[cardinal[up.day]],
[rope[months.Substr[start: up.month.ORD*3, len: 3]]],
[cardinal[up.year MOD 100]]
];
s.PutF["%02d:%02d:%02d ",
[cardinal[up.hour]], [cardinal[up.minute]], [cardinal[up.second]]];
ConvertZone[];
};
$notEqual => s.PutRope["~="];
$greaterThan => s.PutChar['>];
ENDCASE;
};
derivedList: LIST OF ROPE ← LIST[".bcd", ".boot", ".press", ".signals"];
ClassifyFileExtension:
PUBLIC
PROC [file:
ROPE]
RETURNS [DFUtilities.FilterA] = {
dot, bang, len: INT;
[dot, bang, len] ← FindPlaces[file];
IF dot >= bang THEN RETURN [$source];
len ← bang-dot;
FOR each:
LIST
OF
ROPE ← derivedList, each.rest
WHILE each #
NIL
DO
IF Rope.Run[each.first, 0, file, dot, FALSE] = len THEN RETURN [$derived];
ENDLOOP;
RETURN[$source]
};
GetVersionNumber:
PUBLIC
PROC [r:
ROPE]
RETURNS [
ROPE] = {
RETURN[r.Substr[start: FindVersionNumber[r]]]
};
RemoveVersionNumber:
PUBLIC
PROC [r:
ROPE]
RETURNS [
ROPE] = {
RETURN[r.Substr[len: FindVersionNumber[r]]]
};
FindVersionNumber:
PROC [r:
ROPE]
RETURNS [
INT] = {
len: INT ← Rope.Length[r];
pos: INT ← len;
WHILE (pos ← pos-1) >= 0
DO
SELECT Rope.InlineFetch[r, pos]
FROM
'! => RETURN [pos];
'., '>, '] => RETURN [len];
ENDCASE;
ENDLOOP;
RETURN [len];
};
FindPlaces:
PROC [r:
ROPE]
RETURNS [dot, bang, len:
INT] = {
bang ← dot ← len ← Rope.Length[r];
WHILE dot # 0
DO
SELECT Rope.InlineFetch[r, dot ← dot-1]
FROM
'! => bang ← dot;
'. => RETURN;
'>, '] => EXIT;
ENDCASE;
ENDLOOP;
dot ← len;
};
RaiseSyntaxError:
PROC [prefix:
ROPE, text:
REF
TEXT] = {
ERROR SyntaxError[IO.PutFR["%g '%g'.", [rope[prefix]], [text[text]] ] ];
};
END.