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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 3.2//EN">
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<html>
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<head>
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<title>HTMLArea Spell Checker</title>
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</head>
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<body>
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<h1>HTMLArea Spell Checker</h1>
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<p>The HTMLArea Spell Checker subsystem consists of the following
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files:</p>
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<ul>
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<li>spell-checker.js — the spell checker plugin interface for
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HTMLArea</li>
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<li>spell-checker-ui.html — the HTML code for the user
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interface</li>
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<li>spell-checker-ui.js — functionality of the user
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interface</li>
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<li>spell-checker-logic.cgi — Perl CGI script that checks a text
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given through POST for spelling errors</li>
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<li>spell-checker-style.css — style for mispelled words</li>
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<li>lang/en.js — main language file (English).</li>
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</ul>
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<h2>Process overview</h2>
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<p>
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When an end-user clicks the "spell-check" button in the HTMLArea
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editor, a new window is opened with the URL of "spell-check-ui.html".
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This window initializes itself with the text found in the editor (uses
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<tt>window.opener.SpellChecker.editor</tt> global variable) and it
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submits the text to the server-side script "spell-check-logic.cgi".
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The target of the FORM is an inline frame which is used both to
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display the text and correcting.
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</p>
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<p>
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Further, spell-check-logic.cgi calls Aspell for each portion of plain
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text found in the given HTML. It rebuilds an HTML file that contains
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clear marks of which words are incorrect, along with suggestions for
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each of them. This file is then loaded in the inline frame. Upon
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loading, a JavaScript function from "spell-check-ui.js" is called.
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This function will retrieve all mispelled words from the HTML of the
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iframe and will setup the user interface so that it allows correction.
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</p>
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<h2>The server-side script (spell-check-logic.cgi)</h2>
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<p>
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<strong>Unicode safety</strong> — the program <em>is</em>
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Unicode safe. HTML entities are expanded into their corresponding
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Unicode characters. These characters will be matched as part of the
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word passed to Aspell. All texts passed to Aspell are in Unicode
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(when appropriate). <strike>However, Aspell seems to not support Unicode
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yet (<a
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href="http://mail.gnu.org/archive/html/aspell-user/2000-11/msg00007.html">thread concerning Aspell and Unicode</a>).
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This mean that words containing Unicode
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characters that are not in 0..255 are likely to be reported as "mispelled" by Aspell.</strike>
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</p>
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<p>
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<strong style="font-variant: small-caps; color:
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red;">Update:</strong> though I've never seen it mentioned
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anywhere, it looks that Aspell <em>does</em>, in fact, speak
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Unicode. Or else, maybe <code>Text::Aspell</code> does
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transparent conversion; anyway, this new version of our
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SpellChecker plugin is, as tests show so far, fully
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Unicode-safe... well, probably the <em>only</em> freeware
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Web-based spell-checker which happens to have Unicode support.
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</p>
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<p>
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The Perl Unicode manual (man perluniintro) states:
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</p>
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<blockquote>
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<em>
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Starting from Perl 5.6.0, Perl has had the capacity to handle Unicode
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natively. Perl 5.8.0, however, is the first recommended release for
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serious Unicode work. The maintenance release 5.6.1 fixed many of the
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problems of the initial Unicode implementation, but for example regular
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expressions still do not work with Unicode in 5.6.1.
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</em>
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</blockquote>
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<p>In other words, do <em>not</em> assume that this script is
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Unicode-safe on Perl interpreters older than 5.8.0.</p>
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<p>The following Perl modules are required:</p>
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<ul>
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<li><a href="http://search.cpan.org/search?query=Text%3A%3AAspell&mode=all" target="_blank">Text::Aspell</a></li>
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<li><a href="http://search.cpan.org/search?query=XML%3A%3ADOM&mode=all" target="_blank">XML::DOM</a></li>
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<li><a href="http://search.cpan.org/search?query=CGI&mode=all" target="_blank">CGI</a></li>
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</ul>
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<p>Of these, only Text::Aspell might need to be installed manually. The
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others are likely to be available by default in most Perl distributions.</p>
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<hr />
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<address><a href="http://dynarch.com/mishoo/">Mihai Bazon</a></address>
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<!-- Created: Thu Jul 17 13:22:27 EEST 2003 -->
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<!-- hhmts start --> Last modified: Fri Jan 30 19:14:11 EET 2004 <!-- hhmts end -->
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<!-- doc-lang: English -->
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</body>
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</html>
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