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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 | public string $name; |
| 16 | /** @var array<string,string> */ |
| 17 | private array $args; |
| 18 | private StatusValue $status; |
| 19 | |
| 20 | /** |
| 21 | * @param string $name Tag name, e.g. "maplink" |
| 22 | * @param array<string,string> $args |
| 23 | * @param StatusValue $status |
| 24 | */ |
| 25 | public function __construct( string $name, array $args, StatusValue $status ) { |
| 26 | $this->name = $name; |
| 27 | $this->args = $args; |
| 28 | $this->status = $status; |
| 29 | } |
| 30 | |
| 31 | /** |
| 32 | * @param string $name |
| 33 | * @return bool True if an attribute exists, even if valueless |
| 34 | */ |
| 35 | public function has( string $name ): bool { |
| 36 | return isset( $this->args[$name] ); |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * @param string $name |
| 41 | * @return int|null Null when missing or invalid |
| 42 | */ |
| 43 | public function getInt( string $name ): ?int { |
| 44 | $value = $this->getString( $name, '/^-?[0-9]+$/' ); |
| 45 | if ( $value !== null ) { |
| 46 | $value = intval( $value ); |
| 47 | } |
| 48 | |
| 49 | return $value; |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * @param string $name |
| 54 | * @return float|null Null when missing or invalid |
| 55 | */ |
| 56 | public function getFloat( string $name ): ?float { |
| 57 | $value = $this->getString( $name, '/^-?[0-9]*\.?[0-9]+$/' ); |
| 58 | if ( $value !== null ) { |
| 59 | $value = floatval( $value ); |
| 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 | } |