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Add parser for IE conditional comments, to be used in JS concatenation

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This commit is contained in:
Kijin Sung 2016-05-04 18:06:02 +09:00
parent e22558374f
commit 90bce20794
3 changed files with 132 additions and 1 deletions
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102
common/framework/formatter.php
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@ -337,9 +337,109 @@ class Formatter
{
$content = "@media $media {\n\n$content\n\n}";
}
$result .= trim($content) . "\n\n";
$original_filename = starts_with(\RX_BASEDIR, $filename) ? substr($filename, strlen(\RX_BASEDIR)) : $filename;
$result .= '/* Original file: ' . $original_filename . ' */' . "\n\n" . trim($content) . "\n\n";
}
return $result;
}
/**
* JS concatenation subroutine.
*
* @param string|array $source_filename
* @param string $target_filename
* @return string
*/
public static function concatJS($source_filename, $target_filename)
{
$result = '';
if (!is_array($source_filename))
{
$source_filename = array($source_filename);
}
foreach ($source_filename as $filename)
{
if (is_array($filename) && count($filename) >= 2)
{
list($filename, $targetie) = $filename;
}
else
{
$targetie = null;
}
$content = utf8_clean(file_get_contents($filename));
if ($targetie !== null)
{
$content = 'if (' . self::convertIECondition($targetie) . ') {' . "\n\n" . $content . "\n\n" . '}';
}
$original_filename = starts_with(\RX_BASEDIR, $filename) ? substr($filename, strlen(\RX_BASEDIR)) : $filename;
$result .= '/* Original file: ' . $original_filename . ' */' . "\n\n" . trim($content) . "\n\n";
}
return $result;
}
/**
* Convert IE conditional comments to JS conditions.
*
* @param string $condition
* @return string
*/
public static function convertIECondition($condition)
{
$conversions = array(
'/^true$/i' => 'true',
'/^false$/i' => 'false',
'/^IE$/i' => 'window.navigator.userAgent.match(/MSIE\s/)',
'/^IE\s*(\d+)$/i' => '(/MSIE (\d+)/.exec(window.navigator.userAgent) && /MSIE (\d+)/.exec(window.navigator.userAgent)[1] == %d)',
'/^gt IE\s*(\d+)$/i' => '(/MSIE (\d+)/.exec(window.navigator.userAgent) && /MSIE (\d+)/.exec(window.navigator.userAgent)[1] > %d)',
'/^gte IE\s*(\d+)$/i' => '(/MSIE (\d+)/.exec(window.navigator.userAgent) && /MSIE (\d+)/.exec(window.navigator.userAgent)[1] >= %d)',
'/^lt IE\s*(\d+)$/i' => '(/MSIE (\d+)/.exec(window.navigator.userAgent) && /MSIE (\d+)/.exec(window.navigator.userAgent)[1] < %d)',
'/^lte IE\s*(\d+)$/i' => '(/MSIE (\d+)/.exec(window.navigator.userAgent) && /MSIE (\d+)/.exec(window.navigator.userAgent)[1] <= %d)',
);
$result = array();
$conditions = preg_split('/([\&\|])/', $condition, -1, \PREG_SPLIT_NO_EMPTY | \PREG_SPLIT_DELIM_CAPTURE);
foreach ($conditions as $condition)
{
$condition = trim(preg_replace('/[\(\)]/', '', $condition));
if ($condition === '')
{
continue;
}
if ($condition === '&' || $condition === '|')
{
$result[] = $condition . $condition;
continue;
}
$negation = $condition[0] === '!';
if ($negation)
{
$condition = trim(substr($condition, 1));
}
foreach ($conversions as $regexp => $replacement)
{
if (preg_match($regexp, $condition, $matches))
{
if (count($matches) > 1)
{
array_shift($matches);
$result[] = ($negation ? '!' : '') . vsprintf($replacement, $matches);
}
else
{
$result[] = ($negation ? '!' : '') . $replacement;
}
break;
}
}
}
return count($result) ? implode(' ', $result) : 'false';
}
}