/**
* Generate an XSL stylesheet based on given rendering configuration
*
* @param Rendering $rendering
* @return string
*/
public function getXSL(Rendering $rendering)
{
$groupedTemplates = [];
$prefixes = [];
$templates = $rendering->getTemplates();
// Replace simple templates if there are at least 3 of them
TemplateHelper::replaceHomogeneousTemplates($templates, 3);
// Group tags with identical templates together
foreach ($templates as $tagName => $template) {
$template = $this->optimizer->optimizeTemplate($template);
$groupedTemplates[$template][] = $tagName;
// Record the tag's prefix if applicable
$pos = strpos($tagName, ':');
if ($pos !== false) {
$prefixes[substr($tagName, 0, $pos)] = 1;
}
}
// Declare all the namespaces in use at the top
$xsl = '<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"';
// Append the namespace declarations to the stylesheet
$prefixes = array_keys($prefixes);
sort($prefixes);
foreach ($prefixes as $prefix) {
$xsl .= ' xmlns:' . $prefix . '="urn:s9e:TextFormatter:' . $prefix . '"';
}
/**
* Exclude those prefixes to keep the HTML neat
*
* @link http://lenzconsulting.com/namespaces-in-xslt/#exclude-result-prefixes
*/
if (!empty($prefixes)) {
$xsl .= ' exclude-result-prefixes="' . implode(' ', $prefixes) . '"';
}
// Start the stylesheet with the boilerplate stuff
$xsl .= '><xsl:output method="html" encoding="utf-8" indent="no"';
$xsl .= '/>';
// Add stylesheet parameters
foreach ($rendering->getAllParameters() as $paramName => $paramValue) {
$xsl .= '<xsl:param name="' . htmlspecialchars($paramName) . '"';
if ($paramValue === '') {
$xsl .= '/>';
} else {
$xsl .= '>' . htmlspecialchars($paramValue) . '</xsl:param>';
}
}
// Add templates
foreach ($groupedTemplates as $template => $tagNames) {
// Open the template element
$xsl .= '<xsl:template match="' . implode('|', $tagNames) . '"';
// Make it a self-closing element if the template is empty
if ($template === '') {
$xsl .= '/>';
} else {
$xsl .= '>' . $template . '</xsl:template>';
}
}
$xsl .= '</xsl:stylesheet>';
return $xsl;
}
/**
* @dataProvider getOptimizeTemplateTests
* @testdox optimizeTemplate() tests
*/
public function testOptimizations($original, $expected)
{
$optimizer = new Optimizer();
$this->assertSame($expected, $optimizer->optimizeTemplate($original));
}
