The Lumber Mill - XSLT For Your Templates

FrOSCon Bastian Feder, Thomas Weinert "The Lumber Mill" Using XSLT For Your Templates

About Us ● Application Developer – PHP – XSLT/XPath – (some) JavaScript ● papaya CMS – PHP based Content Management System – uses XSLT for Templates

About You ● Who are you? ● Do you use XSLT? ● How often do you use XSLT? ● Do you use other template systems/languages? ● Smarty? ● TypoScript? ● ...?

Template Systems ● Bind variables ● Layout logic – Placeholders – Conditions – Loops – Callbacks ● Formatting ● Data loading

XSL ● XML – Semantic variable tree ● XPath – Query language for XML trees ● XSLT – Transforming XML ● Conditions ● Loops ● …

Comparison ● PHP based ● XSLT – Individual syntax – Standardized – Individual tools syntax – Individual – Free and documentation commercial tools – Different flavors – Documentation of for different the standard and purpose the implementations – Easy Syntax? – One to rule them all

Nodes ● texts/text[@ident='foo']/* ● texts/text[@ident='foo']/text() ● texts/text[@ident='foo']/node() ● texts/text[@ident='foo']/@value Elements Text nodes Attributes * text() @* node()

Template call/apply ● <xsl:call-template/> – Call templates by name ● <xsl:apply-templates/> – Template matching – Most exact pattern wins ● Current node ● Parameters ● Modes

Static Templates Files ● Template files should not be writable by the web server – Security – Tools ● Template files should not be generated from PHP – Same reasons – Context

Collecting Output Page (HTML) Page (XML) Part 1 (HTML) Part 2 (HTML) Main (XML) Part 1 (XML) Part 2 (XML)

Caching Output Page (HTML) Page (XML) Cache Part 1 (HTML) Part 2 (HTML) Main (XML) Part 1 (XML) Part 2 (XML)

Embedding Output ● Escaping and CDATA-Sections – CDATA is for readability and whitespaces ● <xsl:copy-of select=“...“/> ● disable-output-escaping=“yes“ ● Dangers – HTML Injection

Import templates ● Generic ● Reusable ● Encapsulation ● Inheritance

Multiple Columns Template ● Group items – Calculate positions ● Call item group templates ● Call item generic template ● Use itemType parameter to identify item template ● Call type specific template for item

XML Data Files ● Wellformed XML ● XPath: document() ● URI – Single loading

Language Templates ● Phrases – "layout texts" ● Numbers ● Date and Time

EXSLT ● Community initiative to provide extensions to XSLT – Common – Functions – Math, Random – Strings, Regular Expressions – Dates and Times – Sets – Dynamic

EXSLT: functions module ● Make templates to functions – func:function – func:result ● Namespace required – func – Own

PHP ● Streamwrapper – return XML data for document() ● Callbacks – call php source

Streamwrapper ● PHP file functions use stream wrappers – Internal: http, ftp, phar, … ● Register own stream wrappers – PHP class – Basic functions ● stream_open(), stream_read(), stream_tell(), stream_seek(), stream_eof(), – url_stat() ● No php source!

Callbacks ● Register PHP functions for xsl – registerPHPFunctions($restrict) – php::function('function', parameter, ...) – php::functionString('function', ...)

RTF Problem ● Result Tree Fragment – XML created in XSL – No CDATA – No node set ● XSLT 2.0 ● EXSLT – node-set()

Other Templates ● Repeat String ● JavaScript Escaping

ext/xslcache ● Process cache ● Performance increase ● Still evaluating – Only some checks in php requests ● Only static XSLT ● Same library like ext/xsl – eXSLT – PHP callbacks

Administration ● Single template ● About 25% saved

Output ● Several template ● About 90% saved

Links ● http://www.a-basketful-of-papayas.net/ ● http://www.w3.org/TR/xpath ● http://www.w3.org/TR/xslt ● http://www.dpawson.co.uk/xsl/sect2/sect21.html ● http://code.nytimes.com/projects/xslcache/

The Lumber Mill - XSLT For Your Templates

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