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{
fpGUI - Free Pascal GUI Library
Copyright (C) 2006 - 2008 See the file AUTHORS.txt, included in this
distribution, for details of the copyright.
See the file COPYING.modifiedLGPL, included in this distribution,
for details about redistributing fpGUI.
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.
Description:
This unit handles the load, save and merge functions. Doing
marker searching.
}
unit vfdfile;
{$mode objfpc}{$H+}
interface
uses
SysUtils,
Classes,
gfx_utils;
type
TVFDFileBlock = class
public
BlockID: string;
FormName: string;
Position: integer;
Data: string;
end;
TVFDFile = class
protected
FFileData: string;
FParsedData: string;
FBlocks: TList;
public
NewFormsDecl: string;
NewFormsImpl: string;
constructor Create;
destructor Destroy; override;
function LoadFile(fname: string): boolean;
procedure AddBlock(aposition: integer; ablockid, aformname, ablockdata: string);
function BlockCount: integer;
function Block(index: integer): TVFDFileBlock;
procedure FreeBlocks;
function GetBlocks: integer; // parse file
function MergeBlocks: string; // store file
procedure AddNewFormDecl(formname, formheadblock: string);
procedure AddNewFormImpl(formname, formbody: string);
function FindFormBlock(blockid, formname: string): TVFDFileBlock;
procedure SetFormData(formname, headblock, bodyblock: string);
procedure NewFileSkeleton(unitname: string);
end;
implementation
{ TVFDFile }
procedure TVFDFile.AddBlock(aposition: integer; ablockid, aformname, ablockdata: string);
var
fb: TVFDFileBlock;
begin
fb := TVFDFileBlock.Create;
fb.Position := aposition;
fb.BlockID := ablockid;
fb.FormName := aformname;
fb.Data := ablockdata;
FBlocks.Add(fb);
end;
procedure TVFDFile.AddNewFormDecl(formname, formheadblock: string);
var
s: string;
begin
s :=
' T' + formname + ' = class(TfpgForm)' + LineEnding +
' public' + LineEnding +
' {@VFD_HEAD_BEGIN: ' + formname + '}' + LineEnding +
formheadblock +
' {@VFD_HEAD_END: ' + formname + '}' + LineEnding +
' procedure AfterCreate; override;' + LineEnding
+ ' end;' + LineEnding + LineEnding;
NewFormsDecl := NewFormsDecl + s;
end;
procedure TVFDFile.AddNewFormImpl(formname, formbody: string);
var
s: string;
begin
s := LineEnding + LineEnding +
'procedure T' + formname + '.AfterCreate;' + LineEnding +
'begin' + LineEnding +
' {@VFD_BODY_BEGIN: ' + formname + '}' + LineEnding +
formbody +
' {@VFD_BODY_END: ' + formname + '}' + LineEnding +
'end;' + LineEnding;
NewFormsImpl := NewFormsImpl + s;
end;
function TVFDFile.Block(index: integer): TVFDFileBlock;
begin
Result := nil;
if (index < 1) or (index > FBlocks.Count) then
Exit;
Result := TVFDFileBlock(FBlocks[index - 1]);
end;
function TVFDFile.BlockCount: integer;
begin
Result := FBlocks.Count;
end;
constructor TVFDFile.Create;
begin
FFileData := '';
FParsedData := '';
NewFormsDecl := '';
NewFormsImpl := '';
FBlocks := TList.Create;
end;
destructor TVFDFile.Destroy;
begin
FreeBlocks;
FBlocks.Free;
inherited;
end;
function TVFDFile.FindFormBlock(blockid, formname: string): TVFDFileBlock;
var
n: integer;
fb: TVFDFileBlock;
begin
Result := nil;
for n := 1 to BlockCount do
begin
fb := Block(n);
if (fb.BlockID = blockid) and (UpperCase(fb.FormName) = UpperCase(formname)) then
begin
Result := fb;
Exit;
end;
end;
end;
procedure TVFDFile.FreeBlocks;
var
n: integer;
begin
for n := 0 to FBlocks.Count - 1 do
TVFDFileBlock(FBlocks[n]).Free;
FBlocks.Clear;
NewFormsDecl := '';
NewFormsImpl := '';
end;
function TVFDFile.GetBlocks: integer;
var
n: integer;
s: string;
startp, endp: integer;
formname: string;
bname, startmarker, endmarker: string;
datablock: string;
deletelen: integer;
dropmarker: boolean;
begin
FreeBlocks;
FParsedData := FFileData;
// searching blocks:
repeat
bname := '';
formname := '';
datablock := '';
s := '{@VFD_';
startp := pos(s, FParsedData);
if startp > 0 then
begin
// marker found
n := startp + 2;
while (n < length(FParsedData)) and (FParsedData[n] in ['_', 'A'..'Z']) do
begin
bname := bname + FParsedData[n];
Inc(n);
end;
if FParsedData[n] = ':' then
Inc(n, 2);
while (n < length(FParsedData)) and (FParsedData[n] <> '}') do
begin
formname := formname + FParsedData[n];
Inc(n);
end;
startmarker := copy(FParsedData, startp, n - startp + 1);
deletelen := length(startmarker);
dropmarker := False;
// Writeln('marker: ', startmarker);
// block marker ?
endmarker := '';
if bname = 'VFD_HEAD_BEGIN' then //or (bname = 'VFD_BODY_BEGIN') then
endmarker := '{@VFD_HEAD_END: ' + formname + '}'
else if bname = 'VFD_BODY_BEGIN' then
endmarker := '{@VFD_BODY_END: ' + formname + '}';
if endmarker <> '' then
begin
//Writeln('Block: ',bname,' form: ',formname);
// find the end of the block
endp := pos(endmarker, FParsedData);
if endp > 0 then
begin
//Writeln('end marker found.');
datablock := copy(FParsedData, startp + length(startmarker), endp - startp - length(startmarker));
//Writeln('data block:');
//writeln(datablock);
//writeln('.');
deletelen := endp - startp + length(endmarker);
end
else
dropmarker := True// error: end marker did not found
//Writeln('file error: ',endmarker,' marker wasn''t found.');
// block length = 0
;
end;
Delete(FParsedData, startp, deletelen);
if not dropmarker then
AddBlock(startp, bname, formname, datablock);
end;
until startp <= 0;
//writeln(FParsedData);
Result := BlockCount;
end;
function TVFDFile.LoadFile(fname: string): boolean;
var
ff: file;
s: string;
cnt: integer;
begin
Result := False;
AssignFile(ff, fpgToOSEncoding(fname));
try
Reset(ff, 1);
except
Exit;
end;
FFileData := '';
try
while not EOF(ff) do
begin
SetLength(s, 4096);
BlockRead(ff, s[1], length(s), cnt);
FFileData := FFileData + copy(s, 1, cnt);
if cnt < length(s) then
break;
end;
Result := True;
finally
CloseFile(ff);
end;
//Writeln('data length: ',length(FFileData));
end;
function TVFDFile.MergeBlocks: string;
var
rs: string;
n: integer;
iofs, startp: integer;
fb: TVFDFileBlock;
startmarker, endmarker: string;
iblock: string;
newsaved: boolean;
begin
// Writeln('merging blocks: ');
newsaved := False;
rs := FParsedData;
iofs := 0;
for n := 0 to FBlocks.Count - 1 do
begin
fb := TVFDFileBlock(FBlocks[n]);
startmarker := '{@' + fb.BlockID;
if fb.formname <> '' then
startmarker := startmarker + ': ' + fb.FormName;
startmarker := startmarker + '}';
if fb.BlockID = 'VFD_HEAD_BEGIN' then
endmarker := ' {@VFD_HEAD_END: ' + fb.FormName + '}'
else if fb.BlockID = 'VFD_BODY_BEGIN' then
endmarker := ' {@VFD_BODY_END: ' + fb.FormName + '}'
else
endmarker := '';
iblock := startmarker;
if endmarker <> '' then
iblock := iblock + LineEnding + fb.Data + endmarker;
if fb.BlockID = 'VFD_NEWFORM_DECL' then
iblock := NewFormsDecl + iblock
else if fb.BlockID = 'VFD_NEWFORM_IMPL' then
begin
iblock := iblock + NewFormsImpl;
newsaved := True;
end;
startp := fb.Position + iofs;
insert(iblock, rs, startp);
Inc(iofs, length(iblock));
end;
if not newsaved and (NewFormsImpl <> '') then
rs := rs + NewFormsImpl// do not loose new form data.
;
//writeln(rs);
Result := rs;
end;
procedure TVFDFile.NewFileSkeleton(unitname: string);
begin
FFileData :=
'unit ' + unitname + ';'+ LineEnding + LineEnding +
'{$mode objfpc}{$H+}' + LineEnding + LineEnding +
'interface' + LineEnding + LineEnding +
'uses' + LineEnding +
' SysUtils, Classes, gfxbase, fpgfx, gui_edit, ' + LineEnding +
' gfx_widget, gui_form, gui_label, gui_button,' + LineEnding +
' gui_listbox, gui_memo, gui_combobox, gui_basegrid, gui_grid, ' + LineEnding +
' gui_dialogs, gui_checkbox, gui_tree, gui_trackbar, ' + LineEnding +
' gui_progressbar, gui_radiobutton, gui_tab, gui_menu,' + LineEnding +
' gui_panel, gui_popupcalendar, gui_gauge;' + LineEnding + LineEnding +
'type' + LineEnding + LineEnding +
'{@VFD_NEWFORM_DECL}' + LineEnding + LineEnding +
'implementation' + LineEnding + LineEnding +
'{@VFD_NEWFORM_IMPL}' + LineEnding + LineEnding +
'end.' + LineEnding;
GetBlocks;
end;
procedure TVFDFile.SetFormData(formname, headblock, bodyblock: string);
var
fb: TVFDFileBlock;
begin
fb := FindFormBlock('VFD_HEAD_BEGIN', formname);
if fb <> nil then
fb.Data := HeadBlock
else
AddNewFormDecl(formname, headblock);
fb := FindFormBlock('VFD_BODY_BEGIN', formname);
if fb <> nil then
fb.Data := bodyblock
else
AddNewFormImpl(formname, bodyblock);
end;
end.
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