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{
Copyright (c) 2013 by Yury Sidorov and the FPC Development Team
JSON output of a PPU File
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************}
unit ppujson;
{$mode objfpc}{$H+}
interface
uses
SysUtils, Classes, ppuout;
type
{ TPpuJsonOutput }
TPpuJsonOutput = class(TPpuOutput)
private
FNeedDelim: array of boolean;
function JsonStr(const s: string): string;
procedure BeforeWriteElement;
procedure WriteAttr(const AName, AValue: string);
protected
procedure WriteObjectStart(const AName: string; Def: TPpuDef); override;
procedure WriteObjectEnd(const AName: string; Def: TPpuDef); override;
procedure WriteArrayStart(const AName: string); override;
procedure WriteArrayEnd(const AName: string); override;
procedure WriteStr(const AName, AValue: string); override;
procedure WriteInt(const AName: string; AValue: Int64; Signed: boolean); override;
procedure WriteFloat(const AName: string; AValue: extended); override;
procedure WriteBool(const AName: string; AValue: boolean); override;
procedure WriteNull(const AName: string); override;
public
constructor Create(OutFileHandle: THandle); override;
procedure IncI; override;
procedure DecI; override;
end;
implementation
{ TPpuJsonOutput }
function TPpuJsonOutput.JsonStr(const s: string): string;
var
ws: widestring;
ps: PWideChar;
pd: PAnsiChar;
i, slen, dlen, dpos: integer;
procedure _AddChar(c: ansichar);
begin
if dpos = dlen then begin
dlen:=dlen*2;
SetLength(Result, dlen);
pd:=PAnsiChar(Result) + dpos;
end;
pd^:=c;
Inc(pd);
Inc(dpos);
end;
var
c: widechar;
ss: shortstring;
begin
ws:=UTF8Decode(s);
ps:=PWideChar(ws);
slen:=Length(ws);
dlen:=slen + 2;
SetLength(Result, dlen);
pd:=PAnsiChar(Result);
dpos:=0;
_AddChar('"');
while slen > 0 do begin
c:=ps^;
case c of
'"', '\', '/':
begin
_AddChar('\');
_AddChar(c);
end;
#8:
begin
_AddChar('\');
_AddChar('b');
end;
#9:
begin
_AddChar('\');
_AddChar('t');
end;
#10:
begin
_AddChar('\');
_AddChar('n');
end;
#13:
begin
_AddChar('\');
_AddChar('r');
end;
#12:
begin
_AddChar('\');
_AddChar('f');
end;
else
if (c < #32) or (c > #127) then begin
_AddChar('\');
_AddChar('u');
ss:=hexStr(integer(c), 4);
for i:=1 to 4 do
_AddChar(ss[i]);
end
else
_AddChar(c);
end;
Inc(ps);
Dec(slen);
end;
_AddChar('"');
SetLength(Result, dpos);
end;
procedure TPpuJsonOutput.BeforeWriteElement;
begin
if FNeedDelim[Indent] then
WriteLn(',');
FNeedDelim[Indent]:=True;
end;
procedure TPpuJsonOutput.WriteAttr(const AName, AValue: string);
begin
BeforeWriteElement;
if AName <> '' then
Write(Format('"%s": %s', [AName, AValue]))
else
Write(AValue);
end;
procedure TPpuJsonOutput.WriteStr(const AName, AValue: string);
begin
WriteAttr(AName, JsonStr(AValue));
end;
procedure TPpuJsonOutput.WriteInt(const AName: string; AValue: Int64; Signed: boolean);
begin
if Signed then
WriteAttr(AName, IntToStr(AValue))
else
WriteAttr(AName, IntToStr(QWord(AValue)));
end;
procedure TPpuJsonOutput.WriteFloat(const AName: string; AValue: extended);
var
s: string;
begin
Str(AValue, s);
WriteAttr(AName, s);
end;
procedure TPpuJsonOutput.WriteBool(const AName: string; AValue: boolean);
begin
if AValue then
WriteAttr(AName, 'true')
else
WriteAttr(AName, 'false');
end;
procedure TPpuJsonOutput.WriteNull(const AName: string);
begin
WriteAttr(AName, 'null');
end;
procedure TPpuJsonOutput.WriteArrayStart(const AName: string);
begin
WriteAttr(AName, '[');
WriteLn;
inherited;
end;
procedure TPpuJsonOutput.WriteArrayEnd(const AName: string);
begin
inherited;
Write(']');
end;
procedure TPpuJsonOutput.WriteObjectStart(const AName: string; Def: TPpuDef);
begin
WriteAttr(AName, '{');
WriteLn;
inherited;
end;
procedure TPpuJsonOutput.WriteObjectEnd(const AName: string; Def: TPpuDef);
begin
inherited;
Write('}');
end;
constructor TPpuJsonOutput.Create(OutFileHandle: THandle);
begin
inherited Create(OutFileHandle);
SetLength(FNeedDelim, 10);
FNeedDelim[0]:=False;
end;
procedure TPpuJsonOutput.IncI;
begin
inherited IncI;
if Length(FNeedDelim) >= Indent then
SetLength(FNeedDelim, Indent + 1);
FNeedDelim[Indent]:=False;
end;
procedure TPpuJsonOutput.DecI;
begin
if FNeedDelim[Indent] then
WriteLn;
inherited DecI;
end;
end.
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