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N3Quoter.php
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N3Quoter.php
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<?php
namespace Wikimedia\Purtle;
/**
* Helper class for quoting literals and URIs in N3 output.
* Optionally supports shorthand and prefix resolution.
*
* @license GPL-2.0-or-later
* @author Daniel Kinzler
*/
class N3Quoter {
/**
* @var UnicodeEscaper
*/
private $escaper = null;
/**
* @param bool $escapeUnicode
*/
public function setEscapeUnicode( $escapeUnicode ) {
$this->escaper = $escapeUnicode ? new UnicodeEscaper() : null;
}
/**
* @param string $iri
*
* @return string
*/
public function escapeIRI( $iri ) {
// FIXME: apply unicode escaping?!
return strtr( $iri, [
' ' => '%20',
'"' => '%22',
'<' => '%3C',
'>' => '%3E',
'\\' => '%5C',
'`' => '%60',
'^' => '%5E',
'|' => '%7C',
'{' => '%7B',
'}' => '%7D',
] );
}
/**
* @param string $s
*
* @return string
*/
public function escapeLiteral( $s ) {
// Performance: If the entire string is just (a safe subset) of ASCII, let it through.
// Ok are space (31), ! (32), # (35) - [ (91) and ] (93) to ~ (126), excludes " (34) and \ (92).
if ( preg_match( '/^[ !#-[\]-~]*\z/', $s ) ) {
return $s;
}
// String escapes. Note that the N3 spec is more restrictive than the Turtle and TR
// specifications, see <https://www.w3.org/TeamSubmission/n3/#escaping>
// and <https://www.w3.org/TR/turtle/#string>
// and <https://www.w3.org/TR/n-triples/#grammar-production-literal>.
// Allowed escapes according to the N3 spec are:
// ECHAR ::= '\' [tbnrf"'\]
// The single quote however does not require escaping when used in double quotes.
$escaped = strtr( $s, [
"\x00" => '\u0000',
"\x01" => '\u0001',
"\x02" => '\u0002',
"\x03" => '\u0003',
"\x04" => '\u0004',
"\x05" => '\u0005',
"\x06" => '\u0006',
"\x07" => '\u0007',
"\x08" => '\b',
"\x09" => '\t',
"\x0A" => '\n',
"\x0B" => '\u000B',
"\x0C" => '\f',
"\x0D" => '\r',
"\x0E" => '\u000E',
"\x0F" => '\u000F',
"\x10" => '\u0010',
"\x11" => '\u0011',
"\x12" => '\u0012',
"\x13" => '\u0013',
"\x14" => '\u0014',
"\x15" => '\u0015',
"\x16" => '\u0016',
"\x17" => '\u0017',
"\x18" => '\u0018',
"\x19" => '\u0019',
"\x1A" => '\u001A',
"\x1B" => '\u001B',
"\x1C" => '\u001C',
"\x1D" => '\u001D',
"\x1E" => '\u001E',
"\x1F" => '\u001F',
'"' => '\"',
'\\' => '\\\\',
] );
if ( $this->escaper !== null ) {
$escaped = $this->escaper->escapeString( $escaped );
}
return $escaped;
}
}

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Sat, May 16, 20:02 (3 h, 7 m)
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N3Quoter.php (2 KB)

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