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vendor/phpoffice/math/src/Math/Writer/MathML.php

@@ -0,0 +1,131 @@
+<?php
+
+namespace PhpOffice\Math\Writer;
+
+use PhpOffice\Math\Element;
+use PhpOffice\Math\Exception\NotImplementedException;
+use PhpOffice\Math\Math;
+use XMLWriter;
+
+class MathML implements WriterInterface
+{
+    /** @var XMLWriter */
+    private $output;
+
+    /**
+     * @param Math $math
+     *
+     * @return string
+     */
+    public function write(Math $math): string
+    {
+        $this->output = new XMLWriter();
+        $this->output->openMemory();
+        $this->output->startDocument('1.0', 'UTF-8');
+        $this->output->writeDtd('math', '-//W3C//DTD MathML 2.0//EN', 'http://www.w3.org/Math/DTD/mathml2/mathml2.dtd');
+        $this->output->startElement('math');
+        $this->output->writeAttribute('xmlns', 'http://www.w3.org/1998/Math/MathML');
+
+        foreach ($math->getElements() as $element) {
+            $this->writeElementItem($element);
+        }
+
+        $this->output->endElement();
+        $this->output->endDocument();
+
+        return $this->output->outputMemory();
+    }
+
+    protected function writeElementItem(Element\AbstractElement $element): void
+    {
+        $tagName = $this->getElementTagName($element);
+
+        // Element\AbstractGroupElement
+        if ($element instanceof Element\AbstractGroupElement) {
+            $this->output->startElement($tagName);
+            foreach ($element->getElements() as $childElement) {
+                $this->writeElementItem($childElement);
+            }
+            $this->output->endElement();
+
+            return;
+        }
+
+        // Element\Superscript
+        if ($element instanceof Element\Superscript) {
+            $this->output->startElement($tagName);
+            $this->writeElementItem($element->getBase());
+            $this->writeElementItem($element->getSuperscript());
+            $this->output->endElement();
+
+            return;
+        }
+
+        // Element\Fraction
+        if ($element instanceof Element\Fraction) {
+            $this->output->startElement($tagName);
+            $this->writeElementItem($element->getNumerator());
+            $this->writeElementItem($element->getDenominator());
+            $this->output->endElement();
+
+            return;
+        }
+
+        if ($element instanceof Element\Identifier
+          || $element instanceof Element\Numeric
+          || $element instanceof Element\Operator) {
+            $this->output->startElement($tagName);
+            $this->output->text((string) $element->getValue());
+            $this->output->endElement();
+
+            return;
+        }
+
+        /*
+        throw new NotImplementedException(sprintf(
+            '%s : The class `%s` is not implemented',
+            __METHOD__,
+            get_class($element)
+        ));
+        */
+    }
+
+    protected function getElementTagName(Element\AbstractElement $element): string
+    {
+        // Group
+        if ($element instanceof Element\Row) {
+            return 'mrow';
+        }
+        if ($element instanceof Element\AbstractGroupElement) {
+            /*
+            throw new NotImplementedException(sprintf(
+                '%s : The element of the class `%s` has no tag name',
+                __METHOD__,
+                get_class($element)
+            ));
+            */
+        }
+
+        if ($element instanceof Element\Superscript) {
+            return 'msup';
+        }
+        if ($element instanceof Element\Fraction) {
+            return 'mfrac';
+        }
+        if ($element instanceof Element\Identifier) {
+            return 'mi';
+        }
+        if ($element instanceof Element\Numeric) {
+            return 'mn';
+        }
+        if ($element instanceof Element\Operator) {
+            return 'mo';
+        }
+
+        throw new NotImplementedException(sprintf(
+            '%s : The element of the class `%s` has no tag name',
+            __METHOD__,
+            get_class($element)
+        ));
+    }
+}

vendor/phpoffice/math/src/Math/Writer/OfficeMathML.php

@@ -0,0 +1,102 @@
+<?php
+
+namespace PhpOffice\Math\Writer;
+
+use PhpOffice\Math\Element;
+use PhpOffice\Math\Exception\NotImplementedException;
+use PhpOffice\Math\Math;
+use XMLWriter;
+
+class OfficeMathML implements WriterInterface
+{
+    /** @var XMLWriter */
+    private $output;
+
+    /**
+     * @param Math $math
+     *
+     * @return string
+     */
+    public function write(Math $math): string
+    {
+        $this->output = new XMLWriter();
+        $this->output->openMemory();
+        $this->output->startElement('m:oMathPara');
+        $this->output->writeAttribute('xmlns:m', 'http://schemas.openxmlformats.org/officeDocument/2006/math');
+        $this->output->startElement('m:oMath');
+
+        foreach ($math->getElements() as $element) {
+            $this->writeElementItem($element);
+        }
+
+        $this->output->endElement();
+        $this->output->endElement();
+
+        return $this->output->outputMemory();
+    }
+
+    protected function writeElementItem(Element\AbstractElement $element): void
+    {
+        // Element\Row
+        if ($element instanceof Element\Row) {
+            foreach ($element->getElements() as $childElement) {
+                $this->writeElementItem($childElement);
+            }
+
+            return;
+        }
+
+        // Element\Fraction
+        if ($element instanceof Element\Fraction) {
+            $this->output->startElement($this->getElementTagName($element));
+            $this->output->startElement('m:num');
+            $this->writeElementItem($element->getNumerator());
+            $this->output->endElement();
+            $this->output->startElement('m:den');
+            $this->writeElementItem($element->getDenominator());
+            $this->output->endElement();
+            $this->output->endElement();
+
+            return;
+        }
+
+        if ($element instanceof Element\Identifier
+          || $element instanceof Element\Numeric
+          || $element instanceof Element\Operator) {
+            $this->output->startElement('m:r');
+            $this->output->startElement('m:t');
+            $this->output->text((string) $element->getValue());
+            $this->output->endElement();
+            $this->output->endElement();
+
+            return;
+        }
+
+        // Check if managed
+        $this->getElementTagName($element);
+    }
+
+    protected function getElementTagName(Element\AbstractElement $element): string
+    {
+        // Group
+        if ($element instanceof Element\AbstractGroupElement) {
+            /*
+            throw new NotImplementedException(sprintf(
+                '%s : The element of the class `%s` has no tag name',
+                __METHOD__,
+                get_class($element)
+            ));
+            */
+        }
+
+        if ($element instanceof Element\Fraction) {
+            return 'm:f';
+        }
+
+        throw new NotImplementedException(sprintf(
+            '%s : The element of the class `%s` has no tag name',
+            __METHOD__,
+            get_class($element)
+        ));
+    }
+}

vendor/phpoffice/math/src/Math/Writer/WriterInterface.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace PhpOffice\Math\Writer;
+
+use PhpOffice\Math\Math;
+
+interface WriterInterface
+{
+    public function write(Math $math): string;
+}