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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
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<title>Castle Game Engine: X3DLexer: Class TX3DLexer</title>
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<h2>Castle Game Engine</h2><p><a href="introduction.html" class="navigation">Introduction</a></p><p><a href="AllUnits.html" class="navigation">Units</a></p><p><a href="ClassHierarchy.html" class="navigation">Class Hierarchy</a></p><p><a href="AllClasses.html" class="navigation">Classes, Interfaces, Objects and Records</a></p><p><a href="AllTypes.html" class="navigation">Types</a></p><p><a href="AllVariables.html" class="navigation">Variables</a></p><p><a href="AllConstants.html" class="navigation">Constants</a></p><p><a href="AllFunctions.html" class="navigation">Functions and Procedures</a></p><p><a href="AllIdentifiers.html" class="navigation">Identifiers</a></p></td><td class="content">
<a name="TX3DLexer"></a><h1 class="cio">Class TX3DLexer</h1>
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<td><a class="section" href="#PasDoc-Description">Description</a></td><td><a class="section" href="#PasDoc-Hierarchy">Hierarchy</a></td><td>Fields</td><td><a class="section" href="#PasDoc-Methods">Methods</a></td><td><a class="section" href="#PasDoc-Properties">Properties</a></td></tr></table>
<a name="PasDoc-Description"></a><h2 class="unit">Unit</h2>
<p class="unitlink">
<a href="X3DLexer.html">X3DLexer</a></p>
<h2 class="declaration">Declaration</h2>
<p class="declaration">
<code>type TX3DLexer = class(TObject)</code></p>
<h2 class="description">Description</h2>
<p>
VRML/X3D (classic encoding) lexer.
<p>The lexer always "looks" (i.e. contains in Token and TokenXxx fields) at the next not yet interpreted token.
<p>Remember that VRML is case-sensitive, so <a class="normal" href="X3DLexer.TX3DLexer.html#TokenName">TokenName</a> and <a class="normal" href="X3DLexer.TX3DLexer.html#TokenString">TokenString</a> should be compared in case-sensitive manner. Also note that for VRML/X3D >= 2.0 these fields contain UTF-8 encoded strings.
<p>Note that this lexer can read only from <a class="normal" href="CastleClassUtils.TPeekCharStream.html">TPeekCharStream</a>, not just from any TStream. You may have to wrap your stream in some <a class="normal" href="CastleClassUtils.TPeekCharStream.html">TPeekCharStream</a> descendant (for example create TFileStream and then wrap it inside <a class="normal" href="CastleClassUtils.TBufferedReadStream.html">TBufferedReadStream</a>).</p>
<a name="PasDoc-Hierarchy"></a><h2 class="hierarchy">Hierarchy</h2>
<ul class="hierarchy"><li class="ancestor">TObject</li>
<li class="thisitem">TX3DLexer</li></ul><h2 class="overview">Overview</h2>
<a name="PasDoc-Methods"></a><h3 class="summary">Methods</h3>
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<td class="itemcode"><code>constructor <b><a href="X3DLexer.TX3DLexer.html#Create">Create</a></b>(AStream: <a href="CastleClassUtils.TPeekCharStream.html">TPeekCharStream</a>; AOwnsStream: boolean);</code></td>
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<td class="itemcode"><code>constructor <b><a href="X3DLexer.TX3DLexer.html#CreateForPartialStream">CreateForPartialStream</a></b>( AStream: <a href="CastleClassUtils.TPeekCharStream.html">TPeekCharStream</a>; AOwnsStream: boolean; const AVersion: <a href="X3DLexer.TX3DVersion.html">TX3DVersion</a>); overload;</code></td>
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<td class="itemcode"><code>constructor <b><a href="X3DLexer.TX3DLexer.html#CreateForPartialStream">CreateForPartialStream</a></b>(const S: string; const AVersion: <a href="X3DLexer.TX3DVersion.html">TX3DVersion</a>); overload;</code></td>
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<td class="itemcode"><code>destructor <b><a href="X3DLexer.TX3DLexer.html#Destroy">Destroy</a></b>; override;</code></td>
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<td class="itemcode"><code>function <b><a href="X3DLexer.TX3DLexer.html#NextToken">NextToken</a></b>: <a href="X3DLexer.html#TX3DToken">TX3DToken</a>;</code></td>
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<td class="itemcode"><code>procedure <b><a href="X3DLexer.TX3DLexer.html#NextTokenForceVTName">NextTokenForceVTName</a></b>;</code></td>
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<td class="itemcode"><code>procedure <b><a href="X3DLexer.TX3DLexer.html#NextTokenForceVTString">NextTokenForceVTString</a></b>;</code></td>
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<td class="itemcode"><code>function <b><a href="X3DLexer.TX3DLexer.html#TokenIsKeyword">TokenIsKeyword</a></b>(const Keyword: <a href="X3DLexer.html#TX3DKeyword">TX3DKeyword</a>): boolean; overload;</code></td>
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<td class="itemcode"><code>function <b><a href="X3DLexer.TX3DLexer.html#TokenIsKeyword">TokenIsKeyword</a></b>(const Keywords: <a href="X3DLexer.html#TX3DKeywords">TX3DKeywords</a>): boolean; overload;</code></td>
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<td class="itemcode"><code>function <b><a href="X3DLexer.TX3DLexer.html#DescribeToken">DescribeToken</a></b>: string;</code></td>
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<td class="itemcode"><code>procedure <b><a href="X3DLexer.TX3DLexer.html#CheckTokenIs">CheckTokenIs</a></b>(Tok: <a href="X3DLexer.html#TX3DToken">TX3DToken</a>); overload;</code></td>
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<td class="itemcode"><code>procedure <b><a href="X3DLexer.TX3DLexer.html#CheckTokenIs">CheckTokenIs</a></b>(Tok: <a href="X3DLexer.html#TX3DToken">TX3DToken</a>; const TokDescription: string); overload;</code></td>
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<td class="itemcode"><code>procedure <b><a href="X3DLexer.TX3DLexer.html#CheckTokenIs">CheckTokenIs</a></b>(const Toks: <a href="X3DLexer.html#TX3DTokens">TX3DTokens</a>; const ToksDescription: string); overload;</code></td>
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<td class="itemcode"><code>procedure <b><a href="X3DLexer.TX3DLexer.html#CheckTokenIsKeyword">CheckTokenIsKeyword</a></b>(const Keyword: <a href="X3DLexer.html#TX3DKeyword">TX3DKeyword</a>);</code></td>
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<a name="PasDoc-Properties"></a><h3 class="summary">Properties</h3>
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<td class="itemcode"><code>property <b><a href="X3DLexer.TX3DLexer.html#Stream">Stream</a></b>: <a href="CastleClassUtils.TPeekCharStream.html">TPeekCharStream</a> read FStream;</code></td>
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<td class="itemcode"><code>property <b><a href="X3DLexer.TX3DLexer.html#Version">Version</a></b>: <a href="X3DLexer.TX3DVersion.html">TX3DVersion</a> read fVersion;</code></td>
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<td class="itemcode"><code>property <b><a href="X3DLexer.TX3DLexer.html#Token">Token</a></b>: <a href="X3DLexer.html#TX3DToken">TX3DToken</a> read fToken;</code></td>
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<td class="itemcode"><code>property <b><a href="X3DLexer.TX3DLexer.html#TokenKeyword">TokenKeyword</a></b>: <a href="X3DLexer.html#TX3DKeyword">TX3DKeyword</a> read fTokenKeyword;</code></td>
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<td class="itemcode"><code>property <b><a href="X3DLexer.TX3DLexer.html#TokenName">TokenName</a></b>: string read fTokenName;</code></td>
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<td class="itemcode"><code>property <b><a href="X3DLexer.TX3DLexer.html#TokenFloat">TokenFloat</a></b>: <a href="CastleUtils.html#Float">Float</a> read fTokenFloat;</code></td>
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<td class="itemcode"><code>property <b><a href="X3DLexer.TX3DLexer.html#TokenInteger">TokenInteger</a></b>: Int64 read fTokenInteger;</code></td>
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<td class="itemcode"><code>property <b><a href="X3DLexer.TX3DLexer.html#TokenString">TokenString</a></b>: string read fTokenString;</code></td>
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<h2 class="description">Description</h2>
<h3 class="detail">Methods</h3>
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<td class="itemcode"><a name="Create"></a><code>constructor <b>Create</b>(AStream: <a href="CastleClassUtils.TPeekCharStream.html">TPeekCharStream</a>; AOwnsStream: boolean);</code></td>
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<p>
Standard constructor. After constructor call, <a class="normal" href="X3DLexer.TX3DLexer.html#Version">Version</a> is already set, it's checked that file is not compressed by gzip, and the first Token is already read. </p>
<h6 class="description_section">Exceptions raised</h6>
<dl class="exceptions_raised">
<dt><a class="normal" href="X3DLexer.EX3DGzipCompressed.html">EX3DGzipCompressed</a></dt>
<dd>If the Stream starts with gzip file header.</dd>
</dl>
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<td class="itemcode"><a name="CreateForPartialStream"></a><code>constructor <b>CreateForPartialStream</b>( AStream: <a href="CastleClassUtils.TPeekCharStream.html">TPeekCharStream</a>; AOwnsStream: boolean; const AVersion: <a href="X3DLexer.TX3DVersion.html">TX3DVersion</a>); overload;</code></td>
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<p>
Constructor for the case when you only have part of normal VRML tokens stream.
<p>This is particularly useful to parse fields of X3D in XML encoding. Inside XML attributes we have then a text that can parsed with a classical VRML lexer, to parse fields contents.
<p>This creates a lexer that works quite like a normal lexer. At creation time it doesn't expect header line (like <code>#VRML 2.0 utf8</code>), that why you have to supply VRML major and minor version as parameters here. Also it doesn't try to detect gzip header. It simply behaves like we're in the middle of VRML tokens stream.
<p>Overloaded version with a first parameter as string simply reads tokens from this string (wrapping it in TStringStream and <a class="normal" href="CastleClassUtils.TPeekCharStream.html">TPeekCharStream</a>).
<p></p>
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<td class="itemcode"><a name="CreateForPartialStream"></a><code>constructor <b>CreateForPartialStream</b>(const S: string; const AVersion: <a href="X3DLexer.TX3DVersion.html">TX3DVersion</a>); overload;</code></td>
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<td class="itemcode"><a name="Destroy"></a><code>destructor <b>Destroy</b>; override;</code></td>
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<td class="itemcode"><a name="NextToken"></a><code>function <b>NextToken</b>: <a href="X3DLexer.html#TX3DToken">TX3DToken</a>;</code></td>
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<p>
<code>NextToken</code> reads next token from stream, initializing appropriately all Token* properties. For comfort, this returs the new value of <a class="normal" href="X3DLexer.TX3DLexer.html#Token">Token</a> property.</p>
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<td class="itemcode"><a name="NextTokenForceVTName"></a><code>procedure <b>NextTokenForceVTName</b>;</code></td>
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<p>
Read the next token, knowing that it <i>must</i> be vtName token. This is basically a dirty hack to read some incorrect VRML files, that use not allowed characters in VRML names. This allows us to accept as a vtName some characters that normally (when using normal <a class="normal" href="X3DLexer.TX3DLexer.html#NextToken">NextToken</a>) would get interpreted as other token.
<p>For example, mgf2inv can write name <code>0</code> (a zero, that would be read as vtInteger token in normal circumstances), on some WWW page I found sample VRML models with node name <code>"Crab!"</code> (yes, with exclamation mark and double quotes as part of the node name).
<p></p>
<h6 class="description_section">Exceptions raised</h6>
<dl class="exceptions_raised">
<dt><a class="normal" href="X3DLexer.EX3DParserError.html">EX3DParserError</a></dt>
<dd>When we really really cannot interpret contents as vtName token here — currently this may happen only if end of stream is reached. Note that this is reported as a parsing error.</dd>
</dl>
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<td class="itemcode"><a name="NextTokenForceVTString"></a><code>procedure <b>NextTokenForceVTString</b>;</code></td>
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<p>
Read the next token, knowing that it <i>must</i> be vtString token.
<p>Similiar to <a class="normal" href="X3DLexer.TX3DLexer.html#NextTokenForceVTName">NextTokenForceVTName</a>: use this like a shortcut for </p>
<pre class="longcode">
NextToken;
CheckTokenIs(vtString);
</pre>
<p> but it is not equivalent to such instructions. This is because VRML 1.0 allowed rather strange thing: string may be not enclosed in double quotes if it does not contain a space. This "feature" is not present in VRML >= 2.0, but, unfortunately, I'm trying to handle VRML 1.0 here so I have to conform to this specification. In particular, Blender generates VRML 1.0 files with Texture2.filename fields not enclosed in double quotes. So this "feature" is actually used by someone... So I have to implement this.
<p>Usual <a class="normal" href="X3DLexer.TX3DLexer.html#NextToken">NextToken</a> will not be able to return vtString if it approaches a string not enclosed in double quotes. But THIS function will be able to handle it. So always use this function when you expect a string, this ensures that we will correctly parse any valid VRML 1.0 file.
<p>(unfortunately I'm not doing this now when parsing MFString, this would just require too "unclean" code; I'm using this function only before calling parse on SFString field from <a class="normal" href="X3DNodes.TX3DNode.html#Parse">TX3DNode.Parse</a>.)</p>
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<td class="itemcode"><a name="TokenIsKeyword"></a><code>function <b>TokenIsKeyword</b>(const Keyword: <a href="X3DLexer.html#TX3DKeyword">TX3DKeyword</a>): boolean; overload;</code></td>
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Returns if Token is vtKeyword and <a class="normal" href="X3DLexer.TX3DLexer.html#TokenKeyword">TokenKeyword</a> is given Keyword.</p>
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<td class="itemcode"><a name="TokenIsKeyword"></a><code>function <b>TokenIsKeyword</b>(const Keywords: <a href="X3DLexer.html#TX3DKeywords">TX3DKeywords</a>): boolean; overload;</code></td>
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<td class="itemcode"><a name="DescribeToken"></a><code>function <b>DescribeToken</b>: string;</code></td>
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<p>
Nice textual description of current token, suitable to show to user.</p>
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<td class="itemcode"><a name="CheckTokenIs"></a><code>procedure <b>CheckTokenIs</b>(Tok: <a href="X3DLexer.html#TX3DToken">TX3DToken</a>); overload;</code></td>
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Check is token = Tok, if not -> parser error "expected token 'tok'". You can provide your own description for Tok or default desciption for token will be used.</p>
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<td class="itemcode"><a name="CheckTokenIs"></a><code>procedure <b>CheckTokenIs</b>(Tok: <a href="X3DLexer.html#TX3DToken">TX3DToken</a>; const TokDescription: string); overload;</code></td>
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<td class="itemcode"><a name="CheckTokenIs"></a><code>procedure <b>CheckTokenIs</b>(const Toks: <a href="X3DLexer.html#TX3DTokens">TX3DTokens</a>; const ToksDescription: string); overload;</code></td>
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<td class="itemcode"><a name="CheckTokenIsKeyword"></a><code>procedure <b>CheckTokenIsKeyword</b>(const Keyword: <a href="X3DLexer.html#TX3DKeyword">TX3DKeyword</a>);</code></td>
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<h3 class="detail">Properties</h3>
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<td class="itemcode"><a name="Stream"></a><code>property <b>Stream</b>: <a href="CastleClassUtils.TPeekCharStream.html">TPeekCharStream</a> read FStream;</code></td>
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The stream we're reading. This is simply the AStream that you passed to the constructor of this class.
<p>Note that you can't operate on this stream from outside while lexer works, this could confuse the lexer. But you're free to read some stream properties, e.g. check Stream.Position.</p>
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<td class="itemcode"><a name="Version"></a><code>property <b>Version</b>: <a href="X3DLexer.TX3DVersion.html">TX3DVersion</a> read fVersion;</code></td>
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VRML/X3D version, as recorded in the file header.
<p>All VRML 1.0, 2.0, X3D (various 3.x) are recognized correctly. For Inventor 1.0 ascii, we set Version.Major to 0 (as historically Inventor is a predecessor to VRML 1.0).</p>
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<td class="itemcode"><a name="Token"></a><code>property <b>Token</b>: <a href="X3DLexer.html#TX3DToken">TX3DToken</a> read fToken;</code></td>
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Token we're currently standing on. <a class="normal" href="X3DLexer.TX3DLexer.html#TokenKeyword">TokenKeyword</a>, <a class="normal" href="X3DLexer.TX3DLexer.html#TokenName">TokenName</a>, <a class="normal" href="X3DLexer.TX3DLexer.html#TokenFloat">TokenFloat</a> and <a class="normal" href="X3DLexer.TX3DLexer.html#TokenInteger">TokenInteger</a> have defined values only when token type is appropriate.</p>
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<td class="itemcode"><a name="TokenKeyword"></a><code>property <b>TokenKeyword</b>: <a href="X3DLexer.html#TX3DKeyword">TX3DKeyword</a> read fTokenKeyword;</code></td>
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When Token = vtKeyword, <code>TokenKeyword</code> points to appropriate keyword.
<p>When Version.Major = 1, then you can be sure that <code>TokenKeyword</code> is in <a class="normal" href="X3DLexer.html#VRML10Keywords">VRML10Keywords</a>. Analogous for <a class="normal" href="X3DLexer.html#VRML20Keywords">VRML20Keywords</a> and <a class="normal" href="X3DLexer.html#X3DKeywords">X3DKeywords</a>. So e.g. in VRML 1.0 "PROTO" will be treated like a normal name, not a start of prototype.</p>
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<td class="itemcode"><a name="TokenName"></a><code>property <b>TokenName</b>: string read fTokenName;</code></td>
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When Token = vtName, <code>TokenName</code> contains appropriate VRML name.
<p>Name syntax as in specification on page 24 (really 32 in pdf) of vrml97specification.pdf. It can be a user name for something (for a node, for example) but it can also be a name of a node type or a node field or an enumerated field constant ... it can be <i>anything</i> except keyword.
<p>Note that this is supposed to contain UTF-8 encoded string for VRML >= 2.0.</p>
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<td class="itemcode"><a name="TokenFloat"></a><code>property <b>TokenFloat</b>: <a href="CastleUtils.html#Float">Float</a> read fTokenFloat;</code></td>
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When Token = vtFloat or vtInteger, <code>TokenFloat</code> contains a value of this token.
<p>For vtInteger you have the same thing in <a class="normal" href="X3DLexer.TX3DLexer.html#TokenInteger">TokenInteger</a>, <code>TokenFloat</code> is also initialized to the same value for your comfort (every integer value is also a float, after all).</p>
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<td class="itemcode"><a name="TokenInteger"></a><code>property <b>TokenInteger</b>: Int64 read fTokenInteger;</code></td>
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When Token = vtInteger, <code>TokenInteger</code> contains appropriate value.</p>
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<td class="itemcode"><a name="TokenString"></a><code>property <b>TokenString</b>: string read fTokenString;</code></td>
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When Token = vtString, <code>TokenString</code> contains string value.</p>
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