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| 1 | <?php |
| 2 | |
| 3 | declare( strict_types = 1 ); |
| 4 | |
| 5 | namespace MediaWiki\Extension\Math\WikiTexVC\Nodes; |
| 6 | |
| 7 | use InvalidArgumentException; |
| 8 | use MediaWiki\Extension\Math\WikiTexVC\MMLmappings\BaseMethods; |
| 9 | |
| 10 | class TexNode { |
| 11 | |
| 12 | /** @var list<TexNode|string> */ |
| 13 | protected $args; |
| 14 | |
| 15 | /** |
| 16 | * Creates a TexNode |
| 17 | * @param TexNode|string ...$args arguments for this node |
| 18 | */ |
| 19 | public function __construct( ...$args ) { |
| 20 | foreach ( $args as $arg ) { |
| 21 | if ( !( $arg instanceof TexNode || is_string( $arg ) ) ) { |
| 22 | throw new InvalidArgumentException( 'Wrong input type specified in args.' ); |
| 23 | } |
| 24 | } |
| 25 | $this->args = $args; |
| 26 | } |
| 27 | |
| 28 | protected function parseToMML( $input, $passedArgs, $operatorContent ): string { |
| 29 | $parsed = BaseMethods::checkAndParse( $input, $passedArgs, $operatorContent, $this ); |
| 30 | if ( $parsed ) { |
| 31 | return $parsed; |
| 32 | } |
| 33 | $name = strtoupper( self::class ); |
| 34 | |
| 35 | return BaseMethods::generateMMLError( "Not implemented $name for $input" ); |
| 36 | } |
| 37 | |
| 38 | /** |
| 39 | * @return TexNode[]|string[] |
| 40 | */ |
| 41 | public function getArgs(): array { |
| 42 | return $this->args; |
| 43 | } |
| 44 | |
| 45 | public function render() { |
| 46 | $out = ''; |
| 47 | foreach ( $this->args as $child ) { |
| 48 | $out .= $child instanceof self ? $child->render() : $child; |
| 49 | } |
| 50 | return $out; |
| 51 | } |
| 52 | |
| 53 | public function renderMML( $arguments = [], $state = [] ) { |
| 54 | return array_reduce( $this->args, function ( $out, $child ) use ( $arguments, $state ) { |
| 55 | return $out . $this->renderChildMML( $child, $arguments, $state ); |
| 56 | }, '' ); |
| 57 | } |
| 58 | |
| 59 | public function renderChildMML( $child, $arguments, $state ) { |
| 60 | if ( $child instanceof TexNode ) { |
| 61 | return $child->renderMML( $arguments, $state ); |
| 62 | } |
| 63 | return $child; |
| 64 | } |
| 65 | |
| 66 | public function isEmpty() { |
| 67 | foreach ( $this->args ?? [] as $arg ) { |
| 68 | if ( $arg instanceof TexNode && !$arg->isEmpty() ) { |
| 69 | return false; |
| 70 | } |
| 71 | if ( is_string( $arg ) && $arg !== '' ) { |
| 72 | return false; |
| 73 | } |
| 74 | } |
| 75 | return true; |
| 76 | } |
| 77 | |
| 78 | public function getLength(): int { |
| 79 | return count( $this->args ?? [] ); |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * Wraps the rendered result in curly brackets. |
| 84 | * @return string rendered result in curlies. |
| 85 | */ |
| 86 | public function inCurlies() { |
| 87 | return '{' . $this->render() . '}'; |
| 88 | } |
| 89 | |
| 90 | public function extractIdentifiers( $args = null ) { |
| 91 | $output = []; |
| 92 | |
| 93 | foreach ( $args ?? $this->args as $value ) { |
| 94 | if ( $value instanceof self ) { |
| 95 | $output = array_merge( $output, $value->extractIdentifiers() ); |
| 96 | } else { |
| 97 | $output[] = $value; |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | return $output; |
| 102 | } |
| 103 | |
| 104 | public function containsFunc( $target, $args = null ) { |
| 105 | foreach ( $args ?? $this->args as $value ) { |
| 106 | if ( $value instanceof self ) { |
| 107 | $ret = $value->containsFunc( $target ); |
| 108 | } else { |
| 109 | $ret = self::texContainsFunc( $target, $value ); |
| 110 | } |
| 111 | if ( $ret ) { |
| 112 | // Do not check the other items, if some function has been found already. |
| 113 | return true; |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | return false; |
| 118 | } |
| 119 | |
| 120 | public function extractSubscripts() { |
| 121 | return []; |
| 122 | } |
| 123 | |
| 124 | public function getModIdent() { |
| 125 | return []; |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * strings can contain function references only in a few specific |
| 130 | * forms, which we test for here. |
| 131 | * |
| 132 | * @param string|array $target |
| 133 | * @param string $t Tex to be checked |
| 134 | * @return string|bool rendered LaTeX string or false if not found. |
| 135 | */ |
| 136 | public static function texContainsFunc( $target, string $t ) { |
| 137 | // protect against using random strings as keys in target |
| 138 | if ( !$t || $t[0] !== '\\' ) { |
| 139 | return false; |
| 140 | } |
| 141 | |
| 142 | // may have trailing '(', '[', '\\{' or " " |
| 143 | $t = preg_replace( '/(\(|\[|\\\\{| )$/', '', $t ); |
| 144 | |
| 145 | // special case #1: \\operatorname {someword} |
| 146 | $m = preg_match( '/^\\\\operatorname \{([^\\\\]*)}$/', $t ); |
| 147 | if ( $m == 1 ) { |
| 148 | return self::match( $target, '\\operatorname' ); |
| 149 | } |
| 150 | |
| 151 | // special case #2: \\mbox{\\somefunc} |
| 152 | $matches = []; |
| 153 | $m = preg_match( '/^\\\\mbox\{(\\\\.*)}$/', $t, $matches ); |
| 154 | if ( $m == 1 ) { |
| 155 | return self::match( $target, '\\mbox' ) ?: self::match( $target, $matches[1] ); |
| 156 | } |
| 157 | |
| 158 | // special case #3: \\color, \\pagecolor, \\definecolor |
| 159 | $matches = []; |
| 160 | $m = preg_match( '/^(\\\\(?:page|define)?color) /', $t, $matches ); |
| 161 | if ( $m == 1 ) { |
| 162 | return self::match( $target, $matches[1] ); |
| 163 | } |
| 164 | |
| 165 | // special case #4: \\mathbb, \\mathrm |
| 166 | $matches = []; |
| 167 | $m = preg_match( '/^(\\\\math..) \{(\\\\.*)}$/', $t, $matches ); |
| 168 | if ( $m == 1 ) { |
| 169 | return self::match( $target, $matches[1] ) ?: self::match( $target, $matches[2] ); |
| 170 | } |
| 171 | |
| 172 | return self::match( $target, $t ); |
| 173 | } |
| 174 | |
| 175 | /** |
| 176 | * Matches a string against a string, array, or set target. |
| 177 | * @param string|array $target |
| 178 | * @param string $str |
| 179 | * @return bool|string matching value or false |
| 180 | */ |
| 181 | public static function match( $target, string $str ) { |
| 182 | if ( is_string( $target ) ) { |
| 183 | return $target === $str ? $str : false; |
| 184 | } |
| 185 | |
| 186 | foreach ( $target as $key => $value ) { |
| 187 | // In javascript both types are used to comparison in match functionality |
| 188 | if ( is_string( $key ) ) { |
| 189 | if ( $key === $str ) { |
| 190 | return $str; |
| 191 | } |
| 192 | } elseif ( is_array( $value ) ) { |
| 193 | if ( self::match( $value, $str ) !== false ) { |
| 194 | return $str; |
| 195 | } |
| 196 | } elseif ( $value === $str ) { |
| 197 | return $str; |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | return false; |
| 202 | } |
| 203 | |
| 204 | public function isCurly(): bool { |
| 205 | return false; |
| 206 | } |
| 207 | |
| 208 | } |