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| 1 | <?php |
| 2 | declare( strict_types = 1 ); |
| 3 | |
| 4 | namespace Wikimedia\Parsoid\Wt2Html; |
| 5 | |
| 6 | use Wikimedia\Parsoid\Config\Env; |
| 7 | use Wikimedia\Parsoid\Core\Source; |
| 8 | use Wikimedia\Parsoid\Core\SourceRange; |
| 9 | use Wikimedia\Parsoid\Tokens\EOFTk; |
| 10 | use Wikimedia\Parsoid\Tokens\KV; |
| 11 | use Wikimedia\Parsoid\Tokens\Token; |
| 12 | use Wikimedia\Parsoid\Utils\PHPUtils; |
| 13 | use Wikimedia\Parsoid\Utils\PipelineUtils; |
| 14 | use Wikimedia\Parsoid\Utils\Title; |
| 15 | use Wikimedia\Parsoid\Utils\TokenUtils; |
| 16 | |
| 17 | /** |
| 18 | * A frame represents a template expansion scope including parameters passed |
| 19 | * to the template (args). It provides a generic 'expand' method which |
| 20 | * expands / converts individual parameter values in its scope. It also |
| 21 | * provides methods to check if another expansion would lead to loops or |
| 22 | * exceed the maximum expansion depth. |
| 23 | */ |
| 24 | class Frame { |
| 25 | /** @var ?Frame */ |
| 26 | private $parentFrame; |
| 27 | |
| 28 | /** @var Env */ |
| 29 | private $env; |
| 30 | |
| 31 | /** @var Title */ |
| 32 | private $title; |
| 33 | |
| 34 | /** @var Params */ |
| 35 | private $args; |
| 36 | |
| 37 | private Source $source; |
| 38 | |
| 39 | /** @var int */ |
| 40 | private $depth; |
| 41 | |
| 42 | /** |
| 43 | * @param Title $title |
| 44 | * @param Env $env |
| 45 | * @param KV[] $args |
| 46 | * @param Source $source |
| 47 | * @param ?Frame $parentFrame |
| 48 | */ |
| 49 | public function __construct( |
| 50 | Title $title, Env $env, array $args, Source $source, |
| 51 | ?Frame $parentFrame = null |
| 52 | ) { |
| 53 | $this->title = $title; |
| 54 | $this->env = $env; |
| 55 | $this->args = new Params( $args ); |
| 56 | $this->source = $source; |
| 57 | |
| 58 | if ( $parentFrame ) { |
| 59 | $this->parentFrame = $parentFrame; |
| 60 | $this->depth = $parentFrame->depth + 1; |
| 61 | } else { |
| 62 | $this->parentFrame = null; |
| 63 | $this->depth = 0; |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | public function getEnv(): Env { |
| 68 | return $this->env; |
| 69 | } |
| 70 | |
| 71 | public function getTitle(): Title { |
| 72 | return $this->title; |
| 73 | } |
| 74 | |
| 75 | public function getArgs(): Params { |
| 76 | return $this->args; |
| 77 | } |
| 78 | |
| 79 | // XXX: T405759: Frame should be decoupled from Source; try to avoid |
| 80 | // using this method. |
| 81 | public function getSource(): Source { |
| 82 | return $this->source; |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * Create a new child frame. |
| 87 | * @param Title $title |
| 88 | * @param KV[] $args |
| 89 | * @param string|Source $srcText |
| 90 | * @return Frame |
| 91 | */ |
| 92 | public function newChild( Title $title, array $args, string|Source $srcText ): Frame { |
| 93 | return new Frame( $title, $this->env, $args, $srcText, $this ); |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * Expand / convert a thunk (a chunk of tokens not yet fully expanded). |
| 98 | * @param list<Token|string> $chunk |
| 99 | * @param array{expandTemplates:bool,inTemplate:bool,attrExpansion?:bool,srcOffsets?:?SourceRange} $options |
| 100 | * @return list<Token|string> |
| 101 | */ |
| 102 | public function expand( array $chunk, array $options ): array { |
| 103 | $this->env->log( 'debug', 'Frame.expand', $chunk ); |
| 104 | |
| 105 | if ( !$chunk ) { |
| 106 | return $chunk; |
| 107 | } |
| 108 | |
| 109 | // Add an EOFTk if it isn't present |
| 110 | $content = $chunk; |
| 111 | if ( !( PHPUtils::lastItem( $chunk ) instanceof EOFTk ) ) { |
| 112 | $content[] = new EOFTk(); |
| 113 | } |
| 114 | |
| 115 | // Downstream template uses should be tracked and wrapped only if: |
| 116 | // - not in a nested template Ex: {{Templ:Foo}} and we are processing Foo |
| 117 | // - not in a template use context Ex: {{ .. | {{ here }} | .. }} |
| 118 | // - the attribute use is wrappable Ex: [[ ... | {{ .. link text }} ]] |
| 119 | |
| 120 | $opts = [ |
| 121 | 'pipelineType' => 'peg-tokens-to-expanded-tokens', |
| 122 | 'pipelineOpts' => [ |
| 123 | 'expandTemplates' => $options['expandTemplates'], |
| 124 | 'inTemplate' => $options['inTemplate'], |
| 125 | 'attrExpansion' => $options['attrExpansion'] ?? false |
| 126 | ], |
| 127 | 'sol' => true, |
| 128 | 'srcOffsets' => $options['srcOffsets'] ?? null, |
| 129 | 'tplArgs' => [ 'name' => null, 'title' => null, 'attribs' => [] ] |
| 130 | ]; |
| 131 | |
| 132 | $tokens = PipelineUtils::processContentInPipeline( $this->env, $this, $content, $opts ); |
| 133 | TokenUtils::stripEOFTkFromTokens( $tokens ); |
| 134 | return $tokens; |
| 135 | } |
| 136 | |
| 137 | /** |
| 138 | * Check if expanding a template would lead to a loop, or would exceed the |
| 139 | * maximum expansion depth. |
| 140 | * |
| 141 | * @param Title $title |
| 142 | * @param int $maxDepth |
| 143 | * @param bool $ignoreLoop |
| 144 | * @return ?string null => no error; non-null => error message |
| 145 | */ |
| 146 | public function loopAndDepthCheck( Title $title, int $maxDepth, bool $ignoreLoop ): ?string { |
| 147 | if ( $this->depth > $maxDepth ) { |
| 148 | // Too deep |
| 149 | return "Template recursion depth limit exceeded ($maxDepth): "; |
| 150 | } |
| 151 | |
| 152 | if ( $ignoreLoop ) { |
| 153 | return null; |
| 154 | } |
| 155 | |
| 156 | $frame = $this; |
| 157 | do { |
| 158 | if ( $title->equals( $frame->title ) ) { |
| 159 | // Loop detected |
| 160 | return 'Template loop detected: '; |
| 161 | } |
| 162 | $frame = $frame->parentFrame; |
| 163 | } while ( $frame ); |
| 164 | |
| 165 | // No loop detected. |
| 166 | return null; |
| 167 | } |
| 168 | |
| 169 | /** |
| 170 | * @param mixed $arg |
| 171 | * @param SourceRange $srcOffsets |
| 172 | * |
| 173 | * @return list<Token|string> |
| 174 | */ |
| 175 | private function expandArg( $arg, SourceRange $srcOffsets ): array { |
| 176 | if ( is_string( $arg ) ) { |
| 177 | return [ $arg ]; |
| 178 | } else { |
| 179 | return $this->expand( $arg, [ |
| 180 | 'expandTemplates' => true, |
| 181 | 'inTemplate' => true, |
| 182 | 'srcOffsets' => $srcOffsets, |
| 183 | ] ); |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | /** |
| 188 | * @param Token $tplArgToken |
| 189 | * @return array tokens representing the arg value |
| 190 | */ |
| 191 | public function expandTemplateArg( Token $tplArgToken ): array { |
| 192 | $args = $this->args->named(); |
| 193 | $attribs = $tplArgToken->attribs; |
| 194 | |
| 195 | $expandedKeyToks = $this->expandArg( |
| 196 | $attribs[0]->k, |
| 197 | $attribs[0]->srcOffsets->key |
| 198 | ); |
| 199 | |
| 200 | $argName = trim( TokenUtils::tokensToString( $expandedKeyToks ) ); |
| 201 | $res = $args['dict'][$argName] ?? null; |
| 202 | |
| 203 | if ( $res !== null ) { |
| 204 | $res = isset( $args['namedArgs'][$argName] ) ? |
| 205 | TokenUtils::tokenTrim( $res ) : $res; |
| 206 | return is_string( $res ) ? [ $res ] : $res; |
| 207 | } elseif ( count( $attribs ) > 1 ) { |
| 208 | return $this->expandArg( |
| 209 | $attribs[1]->v, |
| 210 | $attribs[1]->srcOffsets->value |
| 211 | ); |
| 212 | } else { |
| 213 | return array_merge( [ '{{{' ], $expandedKeyToks, [ '}}}' ] ); |
| 214 | } |
| 215 | } |
| 216 | } |