116 lines
3.6 KiB
HTML
116 lines
3.6 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
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<html>
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<head>
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<title>PceEmacs SGML mode</title>
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</head>
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<body>
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<h1>PceEmacs SGML mode</h1>
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<p>
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This page describes the <em>PceEmacs</em> modes <b>SGML</b>, <b>HTML</b> and
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<b>XML</b>. These modes are based on the
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<a href="http://www.swi.psy.uva.nl/projects/SWI-Prolog">SWI-Prolog</a>
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package sgml2pl, an SGML/XML parser for Prolog. It exploits this parser
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to achieve both colouring syntax elements and errors as well as to
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provided menu-driven editing of SGML, HTML and XML documents.
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<h2>Syntax highlighting</h2>
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<p>
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These PceEmacs modes are designed to be simple. Colouring uses the
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following colours
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<p>
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<table align=center border="2">
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<tr><td><font color="#0000ff"><tt><b>bold blue</b></tt></font>
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<td>begin tag
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<tr><td bgcolor="#e7e7e7"><font color="#0000ff">
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<tt><b>bold blue onlight-grey</b></tt>
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</font>
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<td>SGML SHORTREF expansion
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<tr><td><font color="#0000ff"><tt>blue</tt></font>
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<td>end tag
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<tr><td><font color="#288a51">sea-green</font>
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<td>CDATA declared content element
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<tr><td bgcolor="#ffa600"><tt>orange</tt>
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<td>warning
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<tr><td bgcolor="#ff0000"><tt>red</tt>
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<td>error
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</table>
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<p>
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Colouring the whole buffer is the only really safe colouring method, but
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unfortunately doesn't scale with large files. Therefore, this mode is
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only initiated after loading a file in this mode, after typing
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<b>Control-L</b> (<b>recenter</b>) or after an explicit
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<b>colourise_buffer</b> command.
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<p>
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The more error-prone <b>colourise_element</b> is activated after many
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commands as well as after an idle-period of 2 seconds. This command
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searches backward to the first element that encloses the caret and then
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colourises this element. It is errorprone for two reasons. First of
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all, it does not validate whether the checked element itself is at a
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valid location. Second, it does not see elements allowed throught the
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DTD's <b>+(<i>Model</i>)</b> construct.
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<h2>Errors and warnings</h2>
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<p>
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Errors and warning encountered during parsing cause the suspect region
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to be coloured <font color="#ffa600">orange</font> (warning) or <font
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color="#ff0000">red</font> (error). Moving the caret in the suspect
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area causes the error to be printed in the status line at the bottom
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of the editor.
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<h2>Syntax-guided editing</h2>
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<p>
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Most syntax-guided editing is supported using a context-sensitive
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popup-menu associated with the right mouse button. To create an
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<b>new element</b>, press the right mouse-button at the desired location
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and select the desired element. The modifier buttons define how
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the element is inserted:
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<p>
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<table align="center" border="2">
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<tr><td>control <td>Insert adjacent begin- and end-tag.
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<tr><td>shift <td>Place begin- and end-tag each on their own line
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<tr><td>alt <td>(SGML only) create a <b>SHORTTAG</b> element
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</table>
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<p>
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To <b>tag the current selection</b> with a tag, first make a selection and
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then press the right mouse-button inside the selection. The same
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modifiers as above apply. If no modifier is given, the default
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is to place the tag at their own line of the selection contains
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complete lines and `in-line' otherwise.
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<p>
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To <b>add attributes</b> to an element, press the right-button inside the
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elements begin-tag and select the desired elements.
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<h2>Bugs and TODO</h2>
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<ul>
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<li>Cache the parsed DTD
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<li>Deal with included +(Group) elements properly
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<li>Display total number of encountered errors and provide navigation
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on large files
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<li>Personalise layout: style to use for certain tags, syntax
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highlighting, etc.
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<li>Take are of already present attributes and elements.
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</ul>
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</body>
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</html>
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