Symbian3/SDK/Source/GUID-FE888721-C479-5D8A-810F-1A79575A1D58.dita
author Dominic Pinkman <Dominic.Pinkman@Nokia.com>
Thu, 11 Mar 2010 15:24:26 +0000
changeset 2 ebc84c812384
parent 0 89d6a7a84779
permissions -rw-r--r--
week 10 bug fix submission: Bug 1892, Bug 1897, Bug 1319. Also 3 or 4 documents were found to contain code blocks with SFL, which has been fixed. Partial fix for broken links, links to Forum Nokia, and the 'Symbian platform' terminology issues.
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License 
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"Eclipse Public License v1.0" which accompanies this distribution, 
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors: 
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-FE888721-C479-5D8A-810F-1A79575A1D58" xml:lang="en"><title>Introduction
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to Lexical Analysis</title><shortdesc>A <codeph>TLex</codeph> object is used to perform lexical analysis. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>The class is used to:</p>
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<ul>
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<li id="GUID-4D79DE44-4E35-56C3-B6ED-5A82CD015FE9"><p>store a string</p> </li>
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<li id="GUID-537012CB-CFCC-55C3-82DE-1D9B18539BEC"><p>maintain an extraction
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mark to indicate the current lexical element being analysed</p> </li>
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<li id="GUID-7B398A9C-42F1-5ABE-80ED-4237F72806BD"><p>maintain a pointer to
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indicate the next character to be examined.</p> </li>
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</ul>
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<p>Member functions provide facilities to allow analysis and extraction of
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lexical elements from a <codeph>TLex</codeph> object, and a variety of string-to-number
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conversions.</p>
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<p>The <codeph>TLex</codeph> class provides general-purpose lexical analysis
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functions, using the locale-dependent functions of <codeph>TChar</codeph> to
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identify whether characters are digits, letters etc. The data for these locale-dependent
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functions is held in kernel-side locale tables. Thus, <codeph>TLex</codeph> functions
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which use them, require an executive call. If an application requires very
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fast lexical analysis of a language which is not locale-specific, then there
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may be some advantage in designing and implementing a special-purpose lexical
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analyzer class.</p>
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</conbody></concept>