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+{
+ This file is part of the Free Component Library
+
+ JSON Parser demo
+ Copyright (c) 2007 by Michael Van Canneyt michael@freepascal.org
+
+ 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.
+
+ **********************************************************************}
+program parsedemo;
+
+{$mode objfpc}{$H+}
+
+uses
+ Classes, SysUtils, fpjson,jsonparser;
+
+Procedure DoParse(P : TJSONParser);
+
+Var
+ J : TJSONData;
+
+begin
+ Try
+ J:=P.Parse;
+ Try
+ Writeln('Parse succesful. Dumping JSON data : ');
+ If Assigned(J) then
+ begin
+ Writeln('Returned JSON structure has class : ',J.ClassName);
+ Writeln(J.AsJSON)
+ end
+ else
+ Writeln('No JSON data available');
+ Finally
+ FreeAndNil(J);
+ end;
+ except
+ On E : Exception do
+ Writeln('An Exception occurred when parsing : ',E.Message);
+ end;
+end;
+
+
+Procedure ParseFile (FileName : String);
+
+Var
+ F : TFileStream;
+ P : TJSONParser;
+
+begin
+ F:=TFileStream.Create(FileName,fmopenRead);
+ try
+ // Create parser with Stream as source.
+ P:=TJSONParser.Create(F);
+ try
+ DoParse(P);
+ finally
+ FreeAndNil(P);
+ end;
+ finally
+ F.Destroy;
+ end;
+end;
+
+Procedure ParseString(S : String);
+
+Var
+ P : TJSONParser;
+begin
+ // Create parser with Stream as source.
+ P:=TJSONParser.Create(S);
+ try
+ DoParse(P);
+ finally
+ FreeAndNil(P);
+ end;
+end;
+
+Procedure DefaultParsing;
+
+Const
+ // From JSON website
+ SAddr ='{ "addressbook": { "name": "Mary Lebow", '+
+ ' "address": {'+
+ ' "street": "5 Main Street",'+LineEnding+
+ ' "city": "San Diego, CA",'+LineEnding+
+ ' "zip": 91912,'+LineEnding+
+ ' },'+LineEnding+
+ ' "phoneNumbers": [ '+LineEnding+
+ ' "619 332-3452",'+LineEnding+
+ ' "664 223-4667"'+LineEnding+
+ ' ]'+LineEnding+
+ ' }'+LineEnding+
+ '}';
+
+
+begin
+ ParseString('');
+ ParseString('NULL');
+ ParseString('1');
+ ParseString('2.3');
+ ParseString('True');
+ ParseString('False');
+ ParseString('"A string"');
+ ParseString('[ Null, False, 1 , 2.3, "a" , { "b" : 1 }]');
+ ParseString('{ "a" : 1, "b" : "Something" }');
+ ParseString(SAddr);
+end;
+
+Procedure Usage;
+
+begin
+ Writeln('Usage : parsedemo arg1 [arg2 [arg3 ...[argN]]]');
+ Writeln(' ArgN can be the name of an existing file, or a JSON string');
+end;
+
+Var
+ I : Integer;
+
+begin
+ If (ParamCount=0) then
+ DefaultParsing
+ else if (ParamCount=1) and ((Paramstr(1)='-h') or (ParamStr(1)='--help')) then
+ Usage
+ else
+ For I:=1 to ParamCount do
+ If FileExists(Paramstr(i)) then
+ ParseFile(ParamStr(I))
+ else
+ ParseString(Paramstr(I));
+end.
+