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<?php |
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/** |
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* Add MathML elements and attributes to wp_kses_allowed_html. |
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* |
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* @package gutenberg |
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*/ |
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|
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/** |
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* Add MathML elements to the allowed tags array. |
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* |
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* This enables MathML content (e.g. converted from LaTeX, but also directly |
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* imported or pasted) to pass through WordPress's content sanitization. |
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* |
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* @param array $allowedtags The allowed tags. |
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* |
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* @return array The allowed tags with MathML elements added. |
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*/ |
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function gutenberg_kses_allow_mathml( $allowedtags ) { |
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// https://www.w3.org/TR/mathml-core/#global-attributes |
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// Except common attributes added by _wp_add_global_attributes. |
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$math_global_attributes = array( |
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'displaystyle' => true, |
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'scriptlevel' => true, |
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'mathbackground' => true, |
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'mathcolor' => true, |
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'mathsize' => true, |
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// Common attributes also defined by _wp_add_global_attributes. |
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// We do not want to add all those global attributes though. |
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'class' => true, |
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'data-*' => true, |
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'dir' => true, |
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'id' => true, |
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'style' => true, |
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); |
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|
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$math_overunder_attributes = array( |
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'accentunder' => true, |
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'accent' => true, |
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); |
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|
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return array_merge( |
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$allowedtags, |
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array( |
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// https://www.w3.org/TR/mathml-core/#the-top-level-math-element |
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'math' => array_merge( |
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$math_global_attributes, |
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array( |
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'display' => true, |
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) |
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), |
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|
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// https://www.w3.org/TR/mathml-core/#token-elements |
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// https://www.w3.org/TR/mathml-core/#text-mtext |
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'mtext' => $math_global_attributes, |
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// https://www.w3.org/TR/mathml-core/#the-mi-element |
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'mi' => array_merge( |
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$math_global_attributes, |
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array( |
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'mathvariant' => true, |
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) |
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), |
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// https://www.w3.org/TR/mathml-core/#number-mn |
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'mn' => $math_global_attributes, |
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// https://www.w3.org/TR/mathml-core/#operator-fence-separator-or-accent-mo |
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'mo' => array_merge( |
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$math_global_attributes, |
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array( |
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'form' => true, |
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'fence' => true, |
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'separator' => true, |
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'lspace' => true, |
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'rspace' => true, |
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'stretchy' => true, |
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'symmetric' => true, |
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'maxsize' => true, |
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'minsize' => true, |
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'largeop' => true, |
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'movablelimits' => true, |
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) |
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), |
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// https://www.w3.org/TR/mathml-core/#space-mspace |
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'mspace' => array_merge( |
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$math_global_attributes, |
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array( |
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'width' => true, |
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'height' => true, |
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'depth' => true, |
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) |
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), |
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// https://www.w3.org/TR/mathml-core/#string-literal-ms |
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'ms' => $math_global_attributes, |
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|
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// https://www.w3.org/TR/mathml-core/#general-layout-schemata |
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// https://www.w3.org/TR/mathml-core/#horizontally-group-sub-expressions-mrow |
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'mrow' => $math_global_attributes, |
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// https://www.w3.org/TR/mathml-core/#fractions-mfrac |
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'mfrac' => array_merge( |
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$math_global_attributes, |
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array( |
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'linethickness' => true, |
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) |
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), |
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// https://www.w3.org/TR/mathml-core/#radicals-msqrt-mroot |
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'msqrt' => $math_global_attributes, |
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'mroot' => $math_global_attributes, |
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// https://www.w3.org/TR/mathml-core/#style-change-mstyle |
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'mstyle' => $math_global_attributes, |
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// https://www.w3.org/TR/mathml-core/#error-message-merror |
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'merror' => $math_global_attributes, |
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// https://www.w3.org/TR/mathml-core/#adjust-space-around-content-mpadded |
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'mpadded' => array_merge( |
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$math_global_attributes, |
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array( |
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'width' => true, |
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'height' => true, |
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'depth' => true, |
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'lspace' => true, |
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'voffset' => true, |
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) |
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), |
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// https://www.w3.org/TR/mathml-core/#making-sub-expressions-invisible-mphantom |
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'mphantom' => $math_global_attributes, |
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|
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// https://www.w3.org/TR/mathml-core/#script-and-limit-schemata |
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// https://www.w3.org/TR/mathml-core/#subscripts-and-superscripts-msub-msup-msubsup |
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'msub' => $math_global_attributes, |
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'msup' => $math_global_attributes, |
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'msubsup' => $math_global_attributes, |
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// https://www.w3.org/TR/mathml-core/#underscripts-and-overscripts-munder-mover-munderover |
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'munder' => array_merge( $math_global_attributes, $math_overunder_attributes ), |
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'mover' => array_merge( $math_global_attributes, $math_overunder_attributes ), |
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'munderover' => array_merge( $math_global_attributes, $math_overunder_attributes ), |
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// https://www.w3.org/TR/mathml-core/#prescripts-and-tensor-indices-mmultiscripts |
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'mmultiscripts' => $math_global_attributes, |
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'mprescripts' => $math_global_attributes, |
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|
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// https://www.w3.org/TR/mathml-core/#tabular-math |
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// https://www.w3.org/TR/mathml-core/#table-or-matrix-mtable |
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'mtable' => array_merge( |
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$math_global_attributes, |
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array( |
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// Non-standard, used by temml/katex. |
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// https://developer.mozilla.org/en-US/docs/Web/MathML/Reference/Element/mtable |
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'columnalign' => true, |
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'rowspacing' => true, |
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'columnspacing' => true, |
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'align' => true, |
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'rowalign' => true, |
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'columnlines' => true, |
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'rowlines' => true, |
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'frame' => true, |
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'framespacing' => true, |
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'width' => true, |
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) |
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), |
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// https://www.w3.org/TR/mathml-core/#row-in-table-or-matrix-mtr |
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'mtr' => array_merge( |
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$math_global_attributes, |
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array( |
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// Non-standard, used by temml/katex. |
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// https://developer.mozilla.org/en-US/docs/Web/MathML/Reference/Element/mtr |
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'columnalign' => true, |
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'rowalign' => true, |
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) |
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), |
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// https://www.w3.org/TR/mathml-core/#entry-in-table-or-matrix-mtd |
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'mtd' => array_merge( |
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$math_global_attributes, |
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array( |
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'columnspan' => true, |
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'rowspan' => true, |
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// Non-standard, used by temml/katex. |
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// https://developer.mozilla.org/en-US/docs/Web/MathML/Reference/Element/mtd |
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'columnalign' => true, |
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'rowalign' => true, |
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) |
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), |
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|
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// https://www.w3.org/TR/mathml-core/#semantics-and-presentation |
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'semantics' => $math_global_attributes, |
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'annotation' => array_merge( |
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$math_global_attributes, |
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array( |
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'encoding' => true, |
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) |
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), |
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|
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// Non-standard but widely supported, used by temml/katex. |
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'menclose' => array_merge( |
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$math_global_attributes, |
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array( |
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'notation' => true, |
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) |
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), |
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) |
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); |
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} |
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add_filter( 'wp_kses_allowed_html', 'gutenberg_kses_allow_mathml' ); |
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|
