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| 1 | <?php |
| 2 | |
| 3 | namespace Kartographer\Tag; |
| 4 | |
| 5 | use StatusValue; |
| 6 | |
| 7 | /** |
| 8 | * Generic handler to validate and preprocess the arguments of an XML-style parser tag. This class |
| 9 | * doesn't know anything about the arguments and what they mean. |
| 10 | * |
| 11 | * @license MIT |
| 12 | */ |
| 13 | class Tag { |
| 14 | |
| 15 | /** |
| 16 | * @param string $name Tag name, e.g. "maplink" |
| 17 | * @param array<string,string> $args |
| 18 | * @param StatusValue $status |
| 19 | */ |
| 20 | public function __construct( |
| 21 | public readonly string $name, |
| 22 | private readonly array $args, |
| 23 | private readonly StatusValue $status, |
| 24 | ) { |
| 25 | } |
| 26 | |
| 27 | /** |
| 28 | * @param string $name |
| 29 | * @return bool True if an attribute exists, even if valueless |
| 30 | */ |
| 31 | public function has( string $name ): bool { |
| 32 | return isset( $this->args[$name] ); |
| 33 | } |
| 34 | |
| 35 | /** |
| 36 | * @param string $name |
| 37 | * @return int|null Null when missing or invalid |
| 38 | */ |
| 39 | public function getInt( string $name ): ?int { |
| 40 | $value = $this->getString( $name, '/^-?[0-9]+$/' ); |
| 41 | if ( $value !== null ) { |
| 42 | $value = intval( $value ); |
| 43 | } |
| 44 | |
| 45 | return $value; |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * @param string $name |
| 50 | * @param int $max Defaults to +/-360° |
| 51 | * @return float|null Null when missing or invalid |
| 52 | */ |
| 53 | public function getFloat( string $name, int $max = 360 ): ?float { |
| 54 | $value = $this->getString( $name, '/^-?[0-9]*\.?[0-9]+$/' ); |
| 55 | if ( $value !== null ) { |
| 56 | $value = floatval( $value ); |
| 57 | if ( abs( $value ) > $max ) { |
| 58 | return null; |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | return $value; |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Returns value of a named tag attribute with optional validation |
| 67 | * |
| 68 | * @param string $name Attribute name |
| 69 | * @param string|null $regexp Optional regular expression to validate against |
| 70 | * @return string|null Null when missing or invalid |
| 71 | */ |
| 72 | public function getString( string $name, ?string $regexp = null ): ?string { |
| 73 | if ( !isset( $this->args[$name] ) ) { |
| 74 | return null; |
| 75 | } |
| 76 | |
| 77 | $value = trim( $this->args[$name] ); |
| 78 | if ( $regexp && !preg_match( $regexp, $value ) ) { |
| 79 | $this->status->fatal( 'kartographer-error-bad_attr', $name ); |
| 80 | return null; |
| 81 | } |
| 82 | |
| 83 | return $value; |
| 84 | } |
| 85 | |
| 86 | } |