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This project forked from sovos-compliance/superobject
Automatically exported from code.google.com/p/superobject
<html> <head> <style type="text/css"> <!-- pre#excode { background-color:#FFFFFF; border:1px dashed #000000; font-family:'courier new'; font-size:8pt; padding:8px; } span#lit { color:#0000FF; } span#keyw { color:#000000; font-weight:bold; } span#cmt { color:#008000; } span#dtyp { color:#2B91AF; } --> </style> </head> <body bgcolor="#D4D0C8"> <h1>SuperObject</h1> <h3>What is JSON ?</h3> <p> JSON (JavaScript Object Notation) is a lightweight data-interchange format.<br> It is easy for humans to read and write. <br> It is easy for machines to parse and generate. <br> It is based on a subset of the JavaScript Programming Language, Standard ECMA-262 3rd Edition - December 1999. <br> JSON is a text format that is completely language independent but uses conventions that are familiar to programmers.<br> These properties make JSON an ideal data-interchange language.<br> You can get more informations on <a href="http://www.json.org">json.org</a>. <pre id="exCode"> { "name": <span id="lit">"Henri Gourvest"</span>, <span id="cmt">/* this is a comment */</span> "vip": true, "telephones": [<span id="lit">"000000000"</span>, <span id="lit">"111111111111"</span>], "age": 33, "size": 1.83, "adresses": [ { "adress": <span id="lit">"blabla"</span>, "city": <span id="lit">"Metz"</span>, "pc": 57000 }, { "adress": <span id="lit">"blabla"</span>, "city": <span id="lit">"Nantes"</span>, "pc": 44000 } ] } </pre> <h3>Parsing a JSON data structure</h3> <pre id="exCode"> <span id="keyw">var</span> obj: ISuperObject; <span id="keyw">begin</span> obj := SO(<span id="lit">'{"foo": true}'</span>); obj := TSuperObject.ParseString(<span id="lit">'{"foo": true}'</span>); obj := TSuperObject.ParseStream(stream); obj := TSuperObject.ParseFile(FileName); <span id="keyw">end;</span> </pre> <h3>Accessing data</h3> <p> There isn't individual datastructure for each supported data types.<br> They are all an object: the <b>ISuperObject</b>. </p> <pre id="exCode"> val := obj.AsString; val := obj.AsInteger; val := obj.AsBoolean; val := obj.AsDouble; val := obj.AsArray; val := obj.AsObject; val := obj.AsMethod; </pre> <h4>How to read a property value of an object ?</h4> <pre id="exCode"> val := obj.AsObject.S[<span id="lit">'foo'</span>]; <span id="cmt">// get a string</span> val := obj.AsObject.I[<span id="lit">'foo'</span>]; <span id="cmt">// get an Int64</span> val := obj.AsObject.B[<span id="lit">'foo'</span>]; <span id="cmt">// get a Boolean</span> val := obj.AsObject.D[<span id="lit">'foo'</span>]; <span id="cmt">// get a Double</span> val := obj.AsObject.O[<span id="lit">'foo'</span>]; <span id="cmt">// get an Object (default)</span> val := obj.AsObject.M[<span id="lit">'foo'</span>]; <span id="cmt">// get a Method</span> val := obj.AsObject.N[<span id="lit">'foo'</span>]; <span id="cmt">// get a null object</span> </pre> <h4>How to read a value from an array ?</h4> <pre id="exCode"> <span id="cmt">// the advanced way</span> val := obj.AsArray.S[0]; <span id="cmt">// get a string</span> val := obj.AsArray.I[0]; <span id="cmt">// get an Int64</span> val := obj.AsArray.B[0]; <span id="cmt">// get a Boolean</span> val := obj.AsArray.D[0]; <span id="cmt">// get a Double</span> val := obj.AsArray.O[0]; <span id="cmt">// get an Object (default)</span> val := obj.AsArray.M[0]; <span id="cmt">// get a Method</span> val := obj.AsArray.N[0]; <span id="cmt">// get a null object</span> </pre> <h4>Using paths</h4> <p>Using paths is a <b>very productive</b> method to find an object when you know where is it.<br> This is some usage cases: </p> <pre id="exCode"> obj[<span id="lit">'foo'</span>]; <span id="cmt">// get a property</span> obj[<span id="lit">'123'</span>]; <span id="cmt">// get an item array</span> obj[<span id="lit">'foo.list'</span>]; <span id="cmt">// get a property from an object</span> obj[<span id="lit">'foo[123]'</span>]; <span id="cmt">// get an item array from an object</span> obj[<span id="lit">'foo(1,2,3)'</span>]; <span id="cmt">// call a method</span> obj[<span id="lit">'foo[]'</span>] := value; <span id="cmt">// add an item array</span> </pre> <p>you also can encapsulate paths:</p> <pre id="exCode"> obj := so(<span id="lit">'{"index": 1, "items": ["item 1", "item 2", "item 3"]}'</span>); obj[<span id="lit">'items[index]'</span>] <span id="cmt">// return "item 2"</span> </pre> <p>or recreate a new data structure from another:</p> <pre id="exCode"> obj := so(<span id="lit">'{"index": 1, "items": ["item 1", "item 2", "item 3"]}'</span>); obj[<span id="lit">'{"item": items[index], "index": index}'</span>] <span id="cmt">// return {"item": "item 2", "index": 1}</span> </pre> <h3>Browsing data structure</h3> <h4>Using Delphi enumerator.</h4> <p>Using Delphi enumerator you can browse item's array or property's object value in the same maner.</p> <pre id="exCode"> <span id="keyw">var</span> item: ISuperObject; <span id="keyw">begin</span> <span id="keyw">for</span> item <span id="keyw">in</span> obj[<span id="lit">'items'</span>] <span id="keyw">do</span> ... </pre> <p>you can also browse the keys and values of an object like this:</p> <pre id="exCode"> <span id="keyw">var</span> item: TSuperAvlEntry; <span id="keyw">begin</span> <span id="keyw">for</span> item <span id="keyw">in</span> obj.AsObject <span id="keyw">do</span> ... <span id="keyw">begin</span> item.Name; item.Value; <span id="keyw">end</span>; </pre> <h4>Browsing object properties without enumerator</h4> <pre id="exCode"> <span id="keyw">var</span> item: TSuperObjectIter; <span id="keyw">begin</span> <span id="keyw">if</span> ObjectFindFirst(obj, item) <span id="keyw">then</span> <span id="keyw">repeat</span> item.key; item.val; <span id="keyw">until</span> <span id="keyw">not</span> ObjectFindNext(item); ObjectFindClose(item); </pre> <h4>Browsing array items without enumerator</h4> <pre id="exCode"> <span id="keyw">var</span> item: Integer; <span id="keyw">begin</span> <span id="keyw">for</span> item := 0 <span id="keyw">to</span> obj.AsArray.Length - 1 <span id="keyw">do</span> obj.AsArray[item] </pre> <h3>RTTI & marshalling in Delphi 2010</h3> <pre id="exCode"> <span id="keyw">type</span> TData = <span id="keyw">record</span> str: string; int: Integer; bool: Boolean; flt: Double; <span id="keyw">end;</span> <span id="keyw">var</span> ctx: TSuperRttiContext; data: TData; obj: ISuperObject; <span id="keyw">begin</span> ctx := TSuperRttiContext.Create; <span id="keyw">try</span> data := ctx.AsType<TData>(SO(<span id="lit">'{str: "foo", int: 123, bool: true, flt: 1.23}'</span>)); obj := ctx.AsJson<TData>(data); <span id="keyw">finally</span> ctx.Free; <span id="keyw">end;</span> <span id="keyw">end;</span> </pre> <h3>Saving data</h3> <pre id="exCode"> obj.AsJSon(options); obj.SaveTo(stream); obj.SaveTo(filename); </pre> <h3>Helpers</h3> <pre id="exCode"> SO([<span id="lit">'prop1'</span>, true, <span id="lit">'prop2'</span>, 123]); <span id="cmt">// return an object {"prop1": true, "prop2": 123}</span> SA([true, 123]); <span id="cmt">// return an array [true, 123]</span> </pre> <h3>Non canonical forms</h3> The SuperObject is able to parse non canonical forms. <pre id="exCode"> <span id="cmt">// unquoted identifiers</span> SO(<span id="lit">'{foo: true}'</span>); <span id="cmt">// unescaped or unquoted strings</span> SO(<span id="lit">'{собственность: bla bla bla}'</span>); <span id="cmt">// excadecimal</span> SO(<span id="lit">'{foo: \xFF}'</span>); </pre> </body> </html>
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