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fpc/ide/whelp.pas
marco 1a7b8eaefd * minor improvements to debuginfo, and Florian's increasing of the topic size. 
git-svn-id: trunk@13536 -
2009-08-15 13:37:49 +00:00

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{
This file is part of the Free Pascal Integrated Development Environment
Copyright (c) 1998 by Berczi Gabor
Help support & Borland OA .HLP reader objects and routines
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
{$R-}
unit WHelp;
interface
uses
{$ifdef Windows}
{ placed here to avoid TRect to be found in windows unit
for Windows target whereas its found in objects unit for other targets PM }
windows,
{$endif Windows}
Objects,
WUtils;
const
hscLineBreak = #0;
hscLink = #2;
hscLineStart = #3;
hscCode = #5;
hscDirect = #6; { add the next char directly }
hscCenter = #10;
hscRight = #11;
hscNamedMark = #12;
hscTextAttr = #13;
hscTextColor = #14;
hscNormText = #15;
hscInImage = #16;
type
THelpCtx = longint;
TRecord = packed record
SClass : word;
Size : word;
Data : pointer;
end;
PIndexEntry = ^TIndexEntry;
TIndexEntry = packed record
Tag : PString;
HelpCtx : THelpCtx;
FileID : word;
end;
PKeywordDescriptor = ^TKeywordDescriptor;
TKeywordDescriptor = packed record
FileID : word;
Context : THelpCtx;
end;
PKeywordDescriptors = ^TKeywordDescriptors;
TKeywordDescriptors = array[0..MaxBytes div sizeof(TKeywordDescriptor)-1] of TKeywordDescriptor;
PTopic = ^TTopic;
TTopic = object
HelpCtx : THelpCtx;
FileOfs : longint;
TextSize : sw_word;
Text : PByteArray;
LinkCount : sw_word;
Links : PKeywordDescriptors;
LastAccess : longint;
FileID : word;
Param : PString;
StartNamedMark: integer;
NamedMarks : PUnsortedStringCollection;
ExtData : pointer;
ExtDataSize : longint;
function LinkSize: sw_word;
function GetNamedMarkIndex(const MarkName: string): sw_integer;
end;
PTopicCollection = ^TTopicCollection;
TTopicCollection = object(TSortedCollection)
function At(Index: sw_Integer): PTopic;
procedure FreeItem(Item: Pointer); virtual;
function Compare(Key1, Key2: Pointer): Sw_Integer; virtual;
function SearchTopic(AHelpCtx: THelpCtx): PTopic;
end;
PIndexEntryCollection = ^TIndexEntryCollection;
TIndexEntryCollection = object(TSortedCollection)
function At(Index: Sw_Integer): PIndexEntry;
procedure FreeItem(Item: Pointer); virtual;
function Compare(Key1, Key2: Pointer): Sw_Integer; virtual;
end;
PUnsortedIndexEntryCollection = ^TUnsortedIndexEntryCollection;
TUnsortedIndexEntryCollection = object(TCollection)
function At(Index: Sw_Integer): PIndexEntry;
procedure FreeItem(Item: Pointer); virtual;
end;
PHelpFile = ^THelpFile;
THelpFile = object(TObject)
ID : word;
Topics : PTopicCollection;
IndexEntries : PUnsortedIndexEntryCollection;
constructor Init(AID: word);
function LoadTopic(HelpCtx: THelpCtx): PTopic; virtual;
procedure AddTopic(HelpCtx: THelpCtx; Pos: longint; const Param: string;
ExtData: pointer; ExtDataSize: longint);
procedure AddIndexEntry(const Text: string; AHelpCtx: THelpCtx);
destructor Done; virtual;
public
function LoadIndex: boolean; virtual;
function SearchTopic(HelpCtx: THelpCtx): PTopic; virtual;
function ReadTopic(T: PTopic): boolean; virtual;
function GetTopicInfo(T: PTopic) : string; virtual;
private
procedure MaintainTopicCache;
end;
PHelpFileCollection = PCollection;
PHelpFacility = ^THelpFacility;
THelpFacility = object(TObject)
HelpFiles: PHelpFileCollection;
IndexTabSize: sw_integer;
constructor Init;
function AddFile(const FileName, Param: string): PHelpFile;
function AddHelpFile(H: PHelpFile): boolean;
function LoadTopic(SourceFileID: word; Context: THelpCtx): PTopic; virtual;
function GetTopicInfo(SourceFileID: word; Context: THelpCtx) : string; virtual;
function TopicSearch(Keyword: string; var FileID: word; var Context: THelpCtx): boolean; virtual;
function BuildIndexTopic: PTopic; virtual;
destructor Done; virtual;
private
LastID: word;
function SearchFile(ID: byte): PHelpFile;
function SearchTopicInHelpFile(F: PHelpFile; Context: THelpCtx): PTopic;
function SearchTopicOwner(SourceFileID: word; Context: THelpCtx): PHelpFile;
end;
THelpFileOpenProc = function(const FileName,Param: string;Index : longint): PHelpFile;
PHelpFileType = ^THelpFileType;
THelpFileType = record
OpenProc : THelpFileOpenProc;
end;
const TopicCacheSize : sw_integer = 10;
HelpStreamBufSize : sw_integer = 4096;
HelpFacility : PHelpFacility = nil;
MaxHelpTopicSize : sw_word = 1024*1024;
function NewTopic(FileID: byte; HelpCtx: THelpCtx; Pos: longint; Param: string;
ExtData: pointer; ExtDataSize: longint): PTopic;
procedure DisposeTopic(P: PTopic);
procedure RenderTopic(Lines: PUnsortedStringCollection; T: PTopic);
procedure BuildTopic(Lines: PUnsortedStringCollection; T: PTopic);
procedure AddLinkToTopic(T: PTopic; AFileID: word; ACtx: THelpCtx);
function NewIndexEntry(Tag: string; FileID: word; HelpCtx: THelpCtx): PIndexEntry;
procedure DisposeIndexEntry(P: PIndexEntry);
procedure DisposeRecord(var R: TRecord);
procedure RegisterHelpFileType(AOpenProc: THelpFileOpenProc);
function GetHelpFileTypeCount: integer;
procedure GetHelpFileType(Index: sw_integer; var HT: THelpFileType);
procedure DoneHelpFilesTypes;
{$ifdef ENDIAN_BIG}
Procedure SwapLong(var x : longint);
Procedure SwapWord(var x : word);
{$endif ENDIAN_BIG}
implementation
uses
{$ifdef Unix}
baseunix,
unix,
{$endif Unix}
{$IFDEF OS2}
DosCalls,
{$ENDIF OS2}
{$ifdef netwlibc}
Libc,
{$endif}
{$ifdef netware_clib}
nwserv,
{$endif}
Strings,
WConsts;
type
PHelpFileTypeCollection = ^THelpFileTypeCollection;
THelpFileTypeCollection = object(TCollection)
function At(Index: sw_Integer): PHelpFileType;
procedure FreeItem(Item: Pointer); virtual;
end;
const
HelpFileTypes : PHelpFileTypeCollection = nil;
{$ifdef ENDIAN_BIG}
Procedure SwapLong(var x : longint);
var
y : word;
z : word;
Begin
y := (x shr 16) and $FFFF;
y := ((y shl 8) and $FFFF) or ((y shr 8) and $ff);
z := x and $FFFF;
z := ((z shl 8) and $FFFF) or ((z shr 8) and $ff);
x := (longint(z) shl 16) or longint(y);
End;
Procedure SwapWord(var x : word);
var
z : byte;
Begin
z := (x shr 8) and $ff;
x := x and $ff;
x := (x shl 8);
x := x or z;
End;
{$endif ENDIAN_BIG}
function NewHelpFileType(AOpenProc: THelpFileOpenProc): PHelpFileType;
var P: PHelpFileType;
begin
New(P);
with P^ do begin OpenProc:=AOpenProc; end;
NewHelpFileType:=P;
end;
procedure DisposeHelpFileType(P: PHelpFileType);
begin
if Assigned(P) then
Dispose(P);
end;
procedure DoneHelpFilesTypes;
begin
if Assigned(HelpFileTypes) then
Dispose(HelpFileTypes, Done);
end;
function THelpFileTypeCollection.At(Index: sw_Integer): PHelpFileType;
begin
At:=inherited At(Index);
end;
procedure THelpFileTypeCollection.FreeItem(Item: Pointer);
begin
if Assigned(Item) then
DisposeHelpFileType(Item);
end;
procedure RegisterHelpFileType(AOpenProc: THelpFileOpenProc);
begin
if not Assigned(HelpFileTypes) then
New(HelpFileTypes, Init(10,10));
HelpFileTypes^.Insert(NewHelpFileType(AOpenProc));
end;
function GetHelpFileTypeCount: integer;
var Count: integer;
begin
if not Assigned(HelpFileTypes) then
Count:=0
else
Count:=HelpFileTypes^.Count;
GetHelpFileTypeCount:=Count;
end;
procedure GetHelpFileType(Index: sw_integer; var HT: THelpFileType);
begin
HT:=HelpFileTypes^.At(Index)^;
end;
{$R-}
{$Q-}
Function GetDosTicks:longint; { returns ticks at 18.2 Hz, just like DOS }
{$IFDEF OS2}
const
QSV_MS_COUNT = 14;
var
L: longint;
begin
DosQuerySysInfo (QSV_MS_COUNT, QSV_MS_COUNT, L, 4);
GetDosTicks := L div 55;
end;
{$ENDIF}
{$IFDEF Unix}
var
tv : TimeVal;
tz : TimeZone;
begin
fpGetTimeOfDay(@tv,@tz);
GetDosTicks:=((tv.tv_Sec mod 86400) div 60)*1092+((tv.tv_Sec mod 60)*1000000+tv.tv_USec) div 54945;
end;
{$endif Unix}
{$ifdef Windows}
begin
GetDosTicks:=(Windows.GetTickCount*5484) div 100;
end;
{$endif Windows}
{$ifdef go32v2}
begin
GetDosTicks:=MemL[$40:$6c];
end;
{$endif go32v2}
{$ifdef netwlibc}
var
tv : TTimeVal;
tz : TTimeZone;
begin
fpGetTimeOfDay(tv,tz);
GetDosTicks:=((tv.tv_sec mod 86400) div 60)*1092+((tv.tv_Sec mod 60)*1000000+tv.tv_USec) div 549
end;
{$endif}
{$ifdef netware_clib}
begin
GetDosTicks := Nwserv.GetCurrentTicks;
end;
{$endif}
{$ifdef amiga}
begin
GetDosTicks := -1;
end;
{$endif}
{$ifdef morphos}
begin
GetDosTicks := -1;
end;
{$endif}
procedure DisposeRecord(var R: TRecord);
begin
with R do
if (Size>0) and (Data<>nil) then FreeMem(Data, Size);
FillChar(R, SizeOf(R), 0);
end;
function NewTopic(FileID: byte; HelpCtx: THelpCtx; Pos: longint; Param: string;
ExtData: pointer; ExtDataSize: longint): PTopic;
var P: PTopic;
begin
New(P); FillChar(P^,SizeOf(P^), 0);
P^.HelpCtx:=HelpCtx; P^.FileOfs:=Pos; P^.FileID:=FileID;
P^.Param:=NewStr(Param);
if Assigned(ExtData) and (ExtDataSize>0) then
begin
P^.ExtDataSize:=ExtDataSize;
GetMem(P^.ExtData,ExtDataSize);
Move(ExtData^,P^.ExtData^,ExtDataSize);
end;
New(P^.NamedMarks, Init(100,100));
NewTopic:=P;
end;
procedure DisposeTopic(P: PTopic);
begin
if P<>nil then
begin
if (P^.TextSize>0) and (P^.Text<>nil) then
FreeMem(P^.Text,P^.TextSize);
P^.Text:=nil;
if {(P^.LinkCount>0) and }(P^.Links<>nil) then
FreeMem(P^.Links,P^.LinkSize);
P^.Links:=nil;
if P^.Param<>nil then DisposeStr(P^.Param); P^.Param:=nil;
if Assigned(P^.ExtData) then
FreeMem(P^.ExtData{$ifndef FPC},P^.ExtDataSize{$endif});
if Assigned(P^.NamedMarks) then Dispose(P^.NamedMarks, Done); P^.NamedMarks:=nil;
Dispose(P);
end;
end;
function CloneTopic(T: PTopic): PTopic;
var NT: PTopic;
procedure CloneMark(P: PString);
begin
NT^.NamedMarks^.InsertStr(GetStr(P));
end;
begin
New(NT);
Move(T^,NT^,SizeOf(NT^));
if NT^.Text<>nil then
begin GetMem(NT^.Text,NT^.TextSize); Move(T^.Text^,NT^.Text^,NT^.TextSize); end;
if NT^.Links<>nil then
begin
GetMem(NT^.Links,NT^.LinkSize);
Move(T^.Links^,NT^.Links^,NT^.LinkSize);
end;
if NT^.Param<>nil then
NT^.Param:=NewStr(T^.Param^);
if Assigned(T^.NamedMarks) then
begin
New(NT^.NamedMarks, Init(T^.NamedMarks^.Count,10));
T^.NamedMarks^.ForEach(@CloneMark);
end;
NT^.ExtDataSize:=T^.ExtDataSize;
if Assigned(T^.ExtData) and (T^.ExtDataSize>0) then
begin
GetMem(NT^.ExtData,NT^.ExtDataSize);
Move(T^.ExtData^,NT^.ExtData^,NT^.ExtDataSize);
end;
CloneTopic:=NT;
end;
procedure RenderTopic(Lines: PUnsortedStringCollection; T: PTopic);
var Size,CurPtr,I,MSize: sw_word;
S: string;
begin
CurPtr:=0;
for I:=0 to Lines^.Count-1 do
begin
S:=GetStr(Lines^.At(I));
Size:=length(S)+1;
Inc(CurPtr,Size);
end;
Size:=CurPtr;
T^.TextSize:=Size; GetMem(T^.Text,T^.TextSize);
CurPtr:=0;
for I:=0 to Lines^.Count-1 do
begin
S:=GetStr(Lines^.At(I)); Size:=length(S); MSize:=Size;
if CurPtr+Size>=T^.TextSize then
MSize:=T^.TextSize-CurPtr;
Move(S[1],PByteArray(T^.Text)^[CurPtr],MSize);
if MSize<>Size then
Break;
Inc(CurPtr,Size);
PByteArray(T^.Text)^[CurPtr]:=ord(hscLineBreak);
Inc(CurPtr);
if CurPtr>=T^.TextSize then Break;
end;
end;
procedure BuildTopic(Lines: PUnsortedStringCollection; T: PTopic);
var Size,CurPtr,MSize: sw_word;
I: sw_integer;
S: string;
begin
CurPtr:=0;
for I:=0 to Lines^.Count-1 do
begin
S:=GetStr(Lines^.At(I));
Size:=length(S);
Inc(CurPtr,Size);
end;
Size:=CurPtr;
T^.TextSize:=Size; GetMem(T^.Text,T^.TextSize);
CurPtr:=0;
for I:=0 to Lines^.Count-1 do
begin
S:=GetStr(Lines^.At(I)); Size:=length(S); MSize:=Size;
if Size>0 then
begin
if CurPtr+Size>=T^.TextSize then
MSize:=T^.TextSize-CurPtr;
Move(S[1],PByteArray(T^.Text)^[CurPtr],MSize);
if MSize<>Size then
Break;
Inc(CurPtr,Size);
end;
if CurPtr>=T^.TextSize then Break;
end;
end;
procedure AddLinkToTopic(T: PTopic; AFileID: word; ACtx: THelpCtx);
var NewSize: word;
NewPtr: pointer;
begin
NewSize:=longint(T^.LinkCount+1)*sizeof(T^.Links^[0]);
GetMem(NewPtr,NewSize);
if Assigned(T^.Links) then
begin
Move(T^.Links^,NewPtr^,T^.LinkSize);
FreeMem(T^.Links,T^.LinkSize);
end;
T^.Links:=NewPtr;
with T^.Links^[T^.LinkCount] do
begin
FileID:=AFileID;
Context:=ACtx;
end;
Inc(T^.LinkCount);
end;
function NewIndexEntry(Tag: string; FileID: word; HelpCtx: THelpCtx): PIndexEntry;
var P: PIndexEntry;
begin
New(P); FillChar(P^,SizeOf(P^), 0);
P^.Tag:=NewStr(Tag); P^.FileID:=FileID; P^.HelpCtx:=HelpCtx;
NewIndexEntry:=P;
end;
procedure DisposeIndexEntry(P: PIndexEntry);
begin
if P<>nil then
begin
if P^.Tag<>nil then DisposeStr(P^.Tag);
Dispose(P);
end;
end;
function TTopic.LinkSize: sw_word;
begin
LinkSize:=LinkCount*SizeOf(Links^[0]);
end;
function TTopic.GetNamedMarkIndex(const MarkName: string): sw_integer;
var I,Index: sw_integer;
begin
Index:=-1;
if Assigned(NamedMarks) then
for I:=0 to NamedMarks^.Count-1 do
if CompareText(GetStr(NamedMarks^.At(I)),MarkName)=0 then
begin
Index:=I;
Break;
end;
GetNamedMarkIndex:=Index;
end;
function TTopicCollection.At(Index: sw_Integer): PTopic;
begin
At:=inherited At(Index);
end;
procedure TTopicCollection.FreeItem(Item: Pointer);
begin
if Item<>nil then DisposeTopic(Item);
end;
function TTopicCollection.Compare(Key1, Key2: Pointer): Sw_Integer;
var K1: PTopic absolute Key1;
K2: PTopic absolute Key2;
R: Sw_integer;
begin
if K1^.HelpCtx<K2^.HelpCtx then R:=-1 else
if K1^.HelpCtx>K2^.HelpCtx then R:= 1 else
R:=0;
Compare:=R;
end;
function TTopicCollection.SearchTopic(AHelpCtx: THelpCtx): PTopic;
var T: TTopic;
P: PTopic;
Index: sw_integer;
begin
T.HelpCtx:=AHelpCtx;
if Search(@T,Index) then
P:=At(Index)
else
P:=nil;
SearchTopic:=P;
end;
function TIndexEntryCollection.At(Index: Sw_Integer): PIndexEntry;
begin
At:=inherited At(Index);
end;
procedure TIndexEntryCollection.FreeItem(Item: Pointer);
begin
if Item<>nil then DisposeIndexEntry(Item);
end;
function TUnsortedIndexEntryCollection.At(Index: Sw_Integer): PIndexEntry;
begin
At:=inherited At(Index);
end;
procedure TUnsortedIndexEntryCollection.FreeItem(Item: Pointer);
begin
if Item<>nil then DisposeIndexEntry(Item);
end;
function TIndexEntryCollection.Compare(Key1, Key2: Pointer): Sw_Integer;
var K1: PIndexEntry absolute Key1;
K2: PIndexEntry absolute Key2;
R: Sw_integer;
S1,S2: string;
T1,T2 : PTopic;
begin
S1:=UpcaseStr(K1^.Tag^); S2:=UpcaseStr(K2^.Tag^);
if S1<S2 then
begin
Compare:=-1;
exit;
end;
if S1>S2 then
begin
Compare:=1;
exit;
end;
(* if assigned(HelpFacility) then
begin
{ Try to read the title of the topic }
T1:=HelpFacility^.LoadTopic(K1^.FileID,K1^.HelpCtx);
T2:=HelpFacility^.LoadTopic(K2^.FileID,K2^.HelpCtx);
if assigned(T1^.Text) and assigned(T2^.Text) then
r:=strcomp(pchar(T1^.Text),pchar(T2^.Text))
else
r:=0;
if r>0 then
begin
Compare:=1;
exit;
end;
if r<0 then
begin
Compare:=-1;
exit;
end;
end; *)
if K1^.FileID<K2^.FileID then R:=-1
else if K1^.FileID>K2^.FileID then R:= 1
else if K1^.HelpCtx<K2^.HelpCtx then
r:=-1
else if K1^.HelpCtx>K2^.HelpCtx then
r:=1
else
R:=0;
Compare:=R;
end;
constructor THelpFile.Init(AID: word);
begin
inherited Init;
ID:=AID;
New(Topics, Init(2000,1000));
New(IndexEntries, Init(2000,1000));
end;
procedure THelpFile.AddTopic(HelpCtx: THelpCtx; Pos: longint; const Param: string; ExtData: pointer; ExtDataSize: longint);
begin
Topics^.Insert(NewTopic(ID,HelpCtx,Pos,Param,ExtData,ExtDataSize));
end;
procedure THelpFile.AddIndexEntry(const Text: string; AHelpCtx: THelpCtx);
begin
IndexEntries^.Insert(NewIndexEntry(Text,ID,AHelpCtx));
end;
function THelpFile.LoadTopic(HelpCtx: THelpCtx): PTopic;
var T: PTopic;
begin
T:=SearchTopic(HelpCtx);
if (T<>nil) then
if T^.Text=nil then
begin
MaintainTopicCache;
if ReadTopic(T)=false then
T:=nil;
if (T<>nil) and (T^.Text=nil) then T:=nil;
end;
if T<>nil then
begin
T^.LastAccess:=GetDosTicks;
T:=CloneTopic(T);
end;
LoadTopic:=T;
end;
function THelpFile.LoadIndex: boolean;
begin
Abstract;
LoadIndex:=false; { remove warning }
end;
function THelpFile.SearchTopic(HelpCtx: THelpCtx): PTopic;
var T: PTopic;
begin
T:=Topics^.SearchTopic(HelpCtx);
SearchTopic:=T;
end;
function THelpFile.ReadTopic(T: PTopic): boolean;
begin
Abstract;
ReadTopic:=false; { remove warning }
end;
function THelpFile.GetTopicInfo(T: PTopic) : string;
begin
Abstract;
GetTopicInfo:=''; { remove warning }
end;
procedure THelpFile.MaintainTopicCache;
var Count: sw_integer;
MinLRU: longint;
procedure CountThem(P: PTopic);
begin if (P^.Text<>nil) or (P^.Links<>nil) then Inc(Count); end;
procedure SearchLRU(P: PTopic);
begin if P^.LastAccess<MinLRU then begin MinLRU:=P^.LastAccess; end; end;
var P: PTopic;
begin
Count:=0; Topics^.ForEach(@CountThem);
if (Count>=TopicCacheSize) then
begin
MinLRU:=MaxLongint; P:=nil; Topics^.ForEach(@SearchLRU);
if P<>nil then
begin
FreeMem(P^.Text,P^.TextSize); P^.TextSize:=0; P^.Text:=nil;
FreeMem(P^.Links,P^.LinkSize); P^.LinkCount:=0; P^.Links:=nil;
end;
end;
end;
destructor THelpFile.Done;
begin
if Topics<>nil then Dispose(Topics, Done);
if IndexEntries<>nil then Dispose(IndexEntries, Done);
inherited Done;
end;
constructor THelpFacility.Init;
begin
inherited Init;
New(HelpFiles, Init(10,10));
IndexTabSize:=40;
end;
function THelpFacility.AddFile(const FileName, Param: string): PHelpFile;
var H: PHelpFile;
OK: boolean;
I: integer;
HT: THelpFileType;
begin
OK:=false; H:=nil;
for I:=0 to GetHelpFileTypeCount-1 do
begin
GetHelpFileType(I,HT);
H:=HT.OpenProc(FileName,Param,LastID+1);
if Assigned(H) then
Break;
end;
if Assigned(H) then
OK:=AddHelpFile(H);
if (not OK) and Assigned(H) then begin Dispose(H, Done); H:=nil; end;
AddFile:=H;
end;
function THelpFacility.AddHelpFile(H: PHelpFile): boolean;
begin
if H<>nil then
begin
HelpFiles^.Insert(H);
Inc(LastID);
{ H^.ID:=LastID; now already set by OpenProc PM }
end;
AddHelpFile:=H<>nil;
end;
function THelpFacility.SearchTopicOwner(SourceFileID: word; Context: THelpCtx): PHelpFile;
var P: PTopic;
HelpFile: PHelpFile;
function Search(F: PHelpFile): boolean;
begin
P:=SearchTopicInHelpFile(F,Context); if P<>nil then HelpFile:=F;
Search:=P<>nil;
end;
begin
HelpFile:=nil;
if SourceFileID=0 then P:=nil else
begin
HelpFile:=SearchFile(SourceFileID);
P:=SearchTopicInHelpFile(HelpFile,Context);
end;
if P=nil then HelpFiles^.FirstThat(@Search);
if P=nil then HelpFile:=nil;
SearchTopicOwner:=HelpFile;
end;
function THelpFacility.LoadTopic(SourceFileID: word; Context: THelpCtx): PTopic;
var P: PTopic;
H: PHelpFile;
begin
if (SourceFileID=0) and (Context=0) then
P:=BuildIndexTopic else
begin
H:=SearchTopicOwner(SourceFileID,Context);
if (H=nil) then P:=nil else
P:=H^.LoadTopic(Context);
end;
LoadTopic:=P;
end;
function THelpFacility.GetTopicInfo(SourceFileID: word; Context: THelpCtx) : string;
var P: PTopic;
H: PHelpFile;
begin
if (SourceFileID=0) and (Context=0) then
begin
P:=BuildIndexTopic;
end
else
begin
H:=SearchTopicOwner(SourceFileID,Context);
if (H=nil) then P:=nil else
P:=H^.SearchTopic(Context);
end;
If not assigned(P) then
GetTopicInfo:='Not found'
else
GetTopicInfo:=H^.GetTopicInfo(P);
end;
function THelpFacility.TopicSearch(Keyword: string; var FileID: word; var Context: THelpCtx): boolean;
function ScanHelpFileExact(H: PHelpFile): boolean;
function SearchExact(P: PIndexEntry): boolean;
begin
SearchExact:=UpcaseStr(P^.Tag^)=Keyword;
end;
var P: PIndexEntry;
begin
H^.LoadIndex;
P:=H^.IndexEntries^.FirstThat(@SearchExact);
if P<>nil then begin FileID:=H^.ID; Context:=P^.HelpCtx; end;
ScanHelpFileExact:=P<>nil;
end;
function ScanHelpFile(H: PHelpFile): boolean;
function Search(P: PIndexEntry): boolean;
begin
Search:=copy(UpcaseStr(P^.Tag^),1,length(Keyword))=Keyword;
end;
var P: PIndexEntry;
begin
H^.LoadIndex;
P:=H^.IndexEntries^.FirstThat(@Search);
if P<>nil then begin FileID:=H^.ID; Context:=P^.HelpCtx; end;
ScanHelpFile:=P<>nil;
end;
var
PH : PHelpFile;
begin
Keyword:=UpcaseStr(Keyword);
PH:=HelpFiles^.FirstThat(@ScanHelpFileExact);
if not assigned(PH) then
PH:=HelpFiles^.FirstThat(@ScanHelpFile);
TopicSearch:=PH<>nil;
end;
function THelpFacility.BuildIndexTopic: PTopic;
var T: PTopic;
Keywords: PIndexEntryCollection;
Lines: PUnsortedStringCollection;
procedure InsertKeywordsOfFile(H: PHelpFile);
function InsertKeywords(P: PIndexEntry): boolean;
begin
Keywords^.Insert(P);
InsertKeywords:=Keywords^.Count>=MaxCollectionSize;
end;
begin
H^.LoadIndex;
if Keywords^.Count<MaxCollectionSize then
H^.IndexEntries^.FirstThat(@InsertKeywords);
end;
procedure AddLine(S: string);
begin
if S='' then S:=' ';
Lines^.Insert(NewStr(S));
end;
var Line: string;
procedure FlushLine;
begin
if Line<>'' then AddLine(Line); Line:='';
end;
var KWCount,NLFlag: sw_integer;
LastFirstChar: char;
procedure NewSection(FirstChar: char);
begin
if FirstChar<=#64 then FirstChar:=#32;
FlushLine;
AddLine('');
AddLine(FirstChar);
AddLine('');
LastFirstChar:=FirstChar;
NLFlag:=0;
end;
function FormatAlias(Alias: string): string;
var StartP,EndP: sw_integer;
begin
repeat
StartP:=Pos(' ',Alias);
if StartP>0 then
begin
EndP:=StartP;
while (EndP+1<=length(Alias)) and (Alias[EndP+1]=' ') do Inc(EndP);
Alias:=copy(Alias,1,StartP-1)+' | '+copy(Alias,EndP+1,High(Alias));
end;
until StartP=0;
if Assigned(HelpFacility) then
if length(Alias)>IndexTabSize-4 then
Alias:=Trim(copy(Alias,1,IndexTabSize-4-2))+'..';
FormatAlias:=Alias;
end;
procedure AddKeyword(KWS: string);
begin
Inc(KWCount); if KWCount=1 then NLFlag:=0;
if (KWCount=1) or
( (Upcase(KWS[1])<>LastFirstChar) and ( (LastFirstChar>#64) or (KWS[1]>#64) ) ) then
NewSection(Upcase(KWS[1]));
KWS:=FormatAlias(KWS);
if (NLFlag mod 2)=0
then Line:=' '+#2+KWS+#2
else begin
Line:=RExpand(Line,IndexTabSize)+#2+KWS+#2;
FlushLine;
end;
Inc(NLFlag);
end;
var KW: PIndexEntry;
I,p : sw_integer;
IsMultiple : boolean;
MultiCount : longint;
St,LastTag : String;
begin
New(Keywords, Init(5000,5000));
HelpFiles^.ForEach(@InsertKeywordsOfFile);
New(Lines, Init((Keywords^.Count div 2)+100,1000));
T:=NewTopic(0,0,0,'',nil,0);
if HelpFiles^.Count=0 then
begin
AddLine('');
AddLine(msg_nohelpfilesinstalled1);
AddLine(msg_nohelpfilesinstalled2);
AddLine(msg_nohelpfilesinstalled3);
AddLine(msg_nohelpfilesinstalled4);
AddLine(msg_nohelpfilesinstalled5);
end else
begin
AddLine(' '+msg_helpindex);
KWCount:=0; Line:='';
T^.LinkCount:=Min(Keywords^.Count,MaxBytes div sizeof(T^.Links^[0])-1);
GetMem(T^.Links,T^.LinkSize);
MultiCount:=0;
LastTag:='';
for I:=0 to T^.LinkCount-1 do
begin
KW:=Keywords^.At(I);
if (LastTag<>KW^.Tag^) then
Begin
MultiCount:=0;
IsMultiple:=(I<T^.LinkCount-1) and (KW^.Tag^=Keywords^.At(I+1)^.Tag^);
End
else
IsMultiple:=true;
if IsMultiple then
Begin
Inc(MultiCount);
(* St:=Trim(strpas(pchar(HelpFacility^.LoadTopic(KW^.FileID,KW^.HelpCtx)^.Text))); *)
St:=KW^.Tag^+' ['+IntToStr(MultiCount)+']';
(* { Remove all special chars }
for p:=1 to Length(st) do
if ord(st[p])<=16 then
st[p]:=' ';
p:=pos(KW^.Tag^,St);
if (p=1) then
AddKeyword(St)
else
AddKeyword(KW^.Tag^+' '+St); *)
AddKeyWord(St);
End
else
AddKeyword(KW^.Tag^);
LastTag:=KW^.Tag^;
T^.Links^[I].Context:=longint(KW^.HelpCtx);
T^.Links^[I].FileID:=KW^.FileID;
end;
FlushLine;
AddLine('');
end;
RenderTopic(Lines,T);
Dispose(Lines, Done);
Keywords^.DeleteAll; Dispose(Keywords, Done);
BuildIndexTopic:=T;
end;
function THelpFacility.SearchFile(ID: byte): PHelpFile;
function Match(P: PHelpFile): boolean;
begin
Match:=(P^.ID=ID);
end;
begin
SearchFile:=HelpFiles^.FirstThat(@Match);
end;
function THelpFacility.SearchTopicInHelpFile(F: PHelpFile; Context: THelpCtx): PTopic;
var P: PTopic;
begin
if F=nil then P:=nil else
P:=F^.SearchTopic(Context);
SearchTopicInHelpFile:=P;
end;
destructor THelpFacility.Done;
begin
inherited Done;
Dispose(HelpFiles, Done);
end;
END.
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