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| 1 | <?php |
| 2 | |
| 3 | namespace PhpOffice\Math\Writer; |
| 4 | |
| 5 | use PhpOffice\Math\Element; |
| 6 | use PhpOffice\Math\Exception\NotImplementedException; |
| 7 | use PhpOffice\Math\Math; |
| 8 | use XMLWriter; |
| 9 | |
| 10 | class MathML implements WriterInterface |
| 11 | { |
| 12 | /** @var XMLWriter */ |
| 13 | private $output; |
| 14 | |
| 15 | /** |
| 16 | * @param Math $math |
| 17 | * |
| 18 | * @return string |
| 19 | */ |
| 20 | public function write(Math $math): string |
| 21 | { |
| 22 | $this->output = new XMLWriter(); |
| 23 | $this->output->openMemory(); |
| 24 | $this->output->startDocument('1.0', 'UTF-8'); |
| 25 | $this->output->writeDtd('math', '-//W3C//DTD MathML 2.0//EN', 'http://www.w3.org/Math/DTD/mathml2/mathml2.dtd'); |
| 26 | $this->output->startElement('math'); |
| 27 | $this->output->writeAttribute('xmlns', 'http://www.w3.org/1998/Math/MathML'); |
| 28 | |
| 29 | foreach ($math->getElements() as $element) { |
| 30 | $this->writeElementItem($element); |
| 31 | } |
| 32 | |
| 33 | $this->output->endElement(); |
| 34 | $this->output->endDocument(); |
| 35 | |
| 36 | return $this->output->outputMemory(); |
| 37 | } |
| 38 | |
| 39 | protected function writeElementItem(Element\AbstractElement $element): void |
| 40 | { |
| 41 | $tagName = $this->getElementTagName($element); |
| 42 | |
| 43 | // Element\AbstractGroupElement |
| 44 | if ($element instanceof Element\AbstractGroupElement) { |
| 45 | $this->output->startElement($tagName); |
| 46 | foreach ($element->getElements() as $childElement) { |
| 47 | $this->writeElementItem($childElement); |
| 48 | } |
| 49 | $this->output->endElement(); |
| 50 | |
| 51 | return; |
| 52 | } |
| 53 | |
| 54 | // Element\Superscript |
| 55 | if ($element instanceof Element\Superscript) { |
| 56 | $this->output->startElement($tagName); |
| 57 | $this->writeElementItem($element->getBase()); |
| 58 | $this->writeElementItem($element->getSuperscript()); |
| 59 | $this->output->endElement(); |
| 60 | |
| 61 | return; |
| 62 | } |
| 63 | |
| 64 | // Element\Fraction |
| 65 | if ($element instanceof Element\Fraction) { |
| 66 | $this->output->startElement($tagName); |
| 67 | $this->writeElementItem($element->getNumerator()); |
| 68 | $this->writeElementItem($element->getDenominator()); |
| 69 | $this->output->endElement(); |
| 70 | |
| 71 | return; |
| 72 | } |
| 73 | |
| 74 | if ($element instanceof Element\Identifier |
| 75 | || $element instanceof Element\Numeric |
| 76 | || $element instanceof Element\Operator) { |
| 77 | $this->output->startElement($tagName); |
| 78 | $this->output->text((string) $element->getValue()); |
| 79 | $this->output->endElement(); |
| 80 | |
| 81 | return; |
| 82 | } |
| 83 | |
| 84 | /* |
| 85 | throw new NotImplementedException(sprintf( |
| 86 | '%s : The class `%s` is not implemented', |
| 87 | __METHOD__, |
| 88 | get_class($element) |
| 89 | )); |
| 90 | */ |
| 91 | } |
| 92 | |
| 93 | protected function getElementTagName(Element\AbstractElement $element): string |
| 94 | { |
| 95 | // Group |
| 96 | if ($element instanceof Element\Row) { |
| 97 | return 'mrow'; |
| 98 | } |
| 99 | if ($element instanceof Element\AbstractGroupElement) { |
| 100 | /* |
| 101 | throw new NotImplementedException(sprintf( |
| 102 | '%s : The element of the class `%s` has no tag name', |
| 103 | __METHOD__, |
| 104 | get_class($element) |
| 105 | )); |
| 106 | */ |
| 107 | } |
| 108 | |
| 109 | if ($element instanceof Element\Superscript) { |
| 110 | return 'msup'; |
| 111 | } |
| 112 | if ($element instanceof Element\Fraction) { |
| 113 | return 'mfrac'; |
| 114 | } |
| 115 | if ($element instanceof Element\Identifier) { |
| 116 | return 'mi'; |
| 117 | } |
| 118 | if ($element instanceof Element\Numeric) { |
| 119 | return 'mn'; |
| 120 | } |
| 121 | if ($element instanceof Element\Operator) { |
| 122 | return 'mo'; |
| 123 | } |
| 124 | |
| 125 | throw new NotImplementedException(sprintf( |
| 126 | '%s : The element of the class `%s` has no tag name', |
| 127 | __METHOD__, |
| 128 | get_class($element) |
| 129 | )); |
| 130 | } |
| 131 | } |