A document has been updated:
http://cocoon.zones.apache.org/daisy/documentation/855.html
Document ID: 855
Branch: main
Language: default
Name: Variable substitution (unchanged)
Document Type: Cocoon Document (unchanged)
Updated on: 3/14/06 7:14:18 PM
Updated by: Bruno Dumon
A new version has been created, state: publish
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using putting an expression between curly braces: <tt>{expression}</tt>.
These
expressions will then be evaluted and replaced with their value.</p>
+++ <p>To enter an opening curly brace that is not the start of an expression,
use
+++ the escape sequence <tt>\{</tt>.</p>
+++
<h1>Summary</h1>
<p>There are basically two types of expressions:</p>
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<li>an expression that uses an input module to retrieve some value</li>
</ul>
--- <h2>Expressions that retrieve a value returned from a matcher or action</h2>
+++ <h1>Expressions that retrieve a value returned from a matcher or action</h1>
<p>Matchers and actions can return a map of values to the sitemap.</p>
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ever use this <tt>sitemap:</tt> syntax.</li>
</ul>
--- <h2>Expressions that uses an input module to retrieve some value</h2>
+++ <h1>Expressions that uses an input module to retrieve some value</h1>
<p>The syntax for these is:</p>
<pre>{<input module name>:<input module specific string>}</pre>
--- <p>Input modules are basically components that get some value from
somewhere.
--- For example, the "request-param" input module retrieves the value of request
--- parameters. The following example takes the name of the stylesheet to apply
from
--- a request parameter called "style":</p>
+++ <p>Input modules are basically components that get some value from
somewhere (in
+++ other words, the map a key to a value). For example, the "request-param"
input
+++ module retrieves the value of request parameters. The following example
takes
+++ the name of the stylesheet to apply from a request parameter called
"style":</p>
<pre><map:match pattern="*.html">
<map:generate src="{1}.xml"/>
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<p class="fixme">Add link to input module docs, once we have these.</p>
+++ <h1>Nesting variable substitution</h1>
+++
+++ <p>Variable substitutions can be nested. For example:</p>
+++
+++ <pre>{url-encode:{request-param:foo}}
+++ </pre>
+++
+++ <p>This will first resolve the expression <tt>{request-param:foo}</tt>, and
the
+++ result thereof will be passed to the url-encode input module.</p>
+++
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