7 changed files with 177 additions and 32 deletions
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<?php |
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declare(strict_types=1); |
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namespace dW\HTML5; |
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|
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use MensBeam\Intl\Encoding; |
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|
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abstract class Charset { |
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/** Matches an encoding label (e.g. "utf-8") to a compatible decoder class. |
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* |
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* @param string $value The encoding label to match |
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*/ |
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public static function fromCharset(string $value): ?string { |
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$encoding = Encoding::matchLabel($value); |
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if ($encoding) { |
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return $encoding['class']; |
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} |
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return null; |
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} |
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|
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/** Extracts an encoding from an HTTP Content-Type header-field |
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* and returns the class name of a compatible decoder. |
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* |
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* @param string $contentType The value of a Content-Type header-field |
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*/ |
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public static function fromTransport(string $contentType): ?string { |
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// Try to sniff out a charset from a Content-Type header-field. |
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// This does cut some corners, but should be sufficient for practical use |
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$s = preg_replace("/\s+/", " ", strtolower($contentType)); |
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$pos = 0; |
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$end = strlen($s); |
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// skip the type |
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while ($pos < $end && @$s[$pos++] !== "/"); |
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// skip the subtype |
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while ($pos < $end && @$s[$pos++] !== ";"); |
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// check parameters in sequence |
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while ($pos < $end) { |
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// skip any leading whitespace |
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if (@$s[$pos] === " ") { |
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$pos++; |
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} |
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// collect characters for the parameter name |
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$param = ""; |
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while ($pos < $end && @$s[$pos] !== "=") { |
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$param .= @$s[$pos++]; |
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} |
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// skip the equals sign |
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$pos++; |
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if ($s[$pos] === '"') { |
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// Value is a quoted-string |
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$pos++; |
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$value = ""; |
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while (!in_array($c = @$s[$pos++], ['"', ""])) { |
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if ($c === "\\") { |
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$value .= @$s[$pos++]; |
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} else { |
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$value .= $c; |
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} |
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} |
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// only interpret the value if a closing quotation mark was seen |
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if ($c !== '"') { |
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$value = ""; |
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} |
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} else { |
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// Value is a bare token |
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$value = ""; |
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while (!in_array($c = @$s[$pos++], [';', " ", ""])) { |
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$value .= $c; |
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} |
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} |
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// if the parameter was the character set, interpret its value and return |
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if ($param === "charset") { |
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$encoding = Encoding::matchLabel($value); |
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if ($encoding) { |
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return $encoding['class']; |
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} else { |
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return null; |
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} |
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} |
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} |
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return null; |
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} |
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|
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public static function fromPrescan(string $data): ?string { |
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return null; |
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} |
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} |
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@ -0,0 +1,48 @@ |
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<?php |
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declare(strict_types=1); |
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namespace dW\HTML5\TestCase; |
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|
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use dW\HTML5\Charset; |
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use MensBeam\Intl\Encoding\UTF8; |
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use MensBeam\Intl\Encoding\Windows1252; |
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|
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/** |
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* @covers \dW\HTML5\Charset |
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*/ |
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class TestCharset extends \PHPUnit\Framework\TestCase { |
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/** @dataProvider provideCharsets */ |
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public function testDetermineEncodingFromEncodingLabel(string $in, ?string $exp) { |
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$this->assertSame($exp, Charset::fromCharset($in)); |
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} |
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|
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public function provideCharsets() { |
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return [ |
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["UTF-8", UTF8::class], |
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[" utf8 ", UTF8::class], |
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["ISO-8859-1", Windows1252::class], |
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["text/html; charset=utf8", null], |
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]; |
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} |
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|
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/** @dataProvider provideContentTypes */ |
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public function testDetermineEncodingFromContentType(string $in, ?string $exp) { |
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$this->assertSame($exp, Charset::fromTransport($in)); |
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} |
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|
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public function provideContentTypes() { |
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return [ |
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["UTF-8", null], |
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["charset=utf8", null], |
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["text/html", null], |
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["text/html charset=utf8", null], |
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["text/html; charset=utf8", UTF8::class], |
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["text/html;charset=utf8", UTF8::class], |
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["text/html; charset=\"utf8\"", UTF8::class], |
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["image/svg+xml; param=value; charset=utf8", UTF8::class], |
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["image/svg+xml; charset=utf8; charset=big5", UTF8::class], |
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["image/svg+xml; charset=utf8;charset=big5", UTF8::class], |
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["text/html; charset=not-valid; charset=big5", null], |
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["text/html; charset=not-valid", null], |
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]; |
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} |
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} |
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