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<title>Token Types</title><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="index.html" title="jEdit 5.6 User's Guide"><link rel="up" href="writing-modes.html" title="Chapter 10. Mode Definition Syntax"><link rel="prev" href="mode-rule-keywords.html" title="The KEYWORDS Tag"><link rel="next" href="mode-match-type.html" title="The MATCH_TYPE Attribute"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Token Types</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="mode-rule-keywords.html">Prev</a> </td><th width="60%" align="center">Chapter 10. Mode Definition Syntax</th><td width="20%" align="right"> <a accesskey="n" href="mode-match-type.html">Next</a></td></tr></table><hr></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="mode-syntax-tokens"></a>Token Types</h2></div></div></div><p>The various token types are used to syntax highlight particular
words in a language. This makes code easier to read. There is a wide
latitude in the usage of the token types, and really it depends on the
specifics of the language as to which token represents which type. Some
examples are given below, but these are just guidelines, not hard and
fast rules.</p><p>Many languages include constructs from other languages. One common
example is html files can include javascript and css blocks. Several of
the mode tags support a DELEGATE attribute, which will allow a section
of text to be passed to a different mode for highlighting. The html mode
delegates to the javascript mode for javascript blocks and to the css
mode for style blocks. Use of the DELEGATE attribute is highly encouraged
when appropriate since it makes writing modes easier, reduces duplication,
and promotes visual consistency across languages.</p><p>Parser rules can highlight tokens using any of the following token
types:</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p><code class="literal">NULL</code> - no special highlighting is
performed on tokens of type <code class="literal">NULL</code></p></li><li class="listitem"><p><code class="literal">COMMENT1</code></p></li><li class="listitem"><p><code class="literal">COMMENT2</code></p></li><li class="listitem"><p><code class="literal">COMMENT3</code></p></li><li class="listitem"><p><code class="literal">COMMENT4</code></p><p>jEdit supports four different types of comment tokens.
Generally, comments are programmer-readable constructs that are
ignored by compilers and interpreters. As an example, the lisp
mode defines four comment types:
</p><p><EOL_SPAN TYPE="COMMENT4">;;;;</EOL_SPAN></p><p><EOL_SPAN TYPE="COMMENT3">;;;</EOL_SPAN></p><p><EOL_SPAN TYPE="COMMENT2">;;</EOL_SPAN></p><p><EOL_SPAN TYPE="COMMENT1">;</EOL_SPAN></p></li><li class="listitem"><p><code class="literal">FUNCTION</code></p><p>The function token is intended to identify functions, methods,
procedures, routines, or named subprograms.</p></li><li class="listitem"><p><code class="literal">DIGIT</code></p><p>The digit token is to identify numbers.</p></li><li class="listitem"><p><code class="literal">INVALID</code></p><p>The invalid type is to indicate that particular words are
not to be used, for example, the java mode defined both "goto"
and "const" as invalid words. These are words that are defined
by the language, but are not to be used.</p></li><li class="listitem"><p><code class="literal">KEYWORD1</code></p></li><li class="listitem"><p><code class="literal">KEYWORD2</code></p></li><li class="listitem"><p><code class="literal">KEYWORD3</code></p></li><li class="listitem"><p><code class="literal">KEYWORD4</code></p><p>
Keywords are used to identify well-defined words within a
language. Some languages naturally divide keywords into
groups, for example, the pascal mode identifies "for" as a
KEYWORD1, "private" as a KEYWORD2, and "int" as a KEYWORD3.
</p></li><li class="listitem"><p><code class="literal">LABEL</code></p><p>A label is generally a named position within a source, for
example, the ada mode defined a label as <<foo>>.
</p></li><li class="listitem"><p><code class="literal">LITERAL1</code></p></li><li class="listitem"><p><code class="literal">LITERAL2</code></p></li><li class="listitem"><p><code class="literal">LITERAL3</code></p></li><li class="listitem"><p><code class="literal">LITERAL4</code></p><p>
Literals are usually, but not always, uninterpreted strings,
for example, "foo" or 'bar'. There are a wide variety of
usages of literals in the mode files.
</p></li><li class="listitem"><p><code class="literal">MARKUP</code></p><p>
The markup token is generally used in the various "markup"
languages, such as xml and html. Markup is used for those
elements that are not specified as words belonging to the
language. For example, in html, <body> would be
considered a keyword, where <foo> would be considered
markup.
</p></li><li class="listitem"><p><code class="literal">OPERATOR</code></p><p>
Common examples of operators are the math symbols, such as
'+', '-', and so on.
</p></li></ul></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="mode-rule-keywords.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="writing-modes.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="mode-match-type.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">The KEYWORDS Tag </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> The MATCH_TYPE Attribute</td></tr></table></div></body></html>
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