feat: handle image rendor

src/lib/ommlConverter.ts

@@ -3,21 +3,45 @@
  * 
  * Uses 'mathml2omml' library to convert MathML to Office Math Markup Language (OMML).
  * This is a pure JavaScript implementation and does not require external XSLT files.
+ * 
+ * @see https://github.com/fiduswriter/mathml2omml
  */
 
 import { mml2omml } from 'mathml2omml';
 
+/**
+ * Cleans up OMML output from mathml2omml to fix known library issues.
+ * These are workarounds for bugs in mathml2omml that produce invalid OMML.
+ * 
+ * @param omml Raw OMML string from mathml2omml
+ * @returns Cleaned OMML string compatible with Microsoft Word
+ */
+function cleanOmml(omml: string): string {
+  return omml
+    // Fix: m:sty m:val="undefined" is invalid (library bug with mathvariant="normal")
+    .replace(/<m:sty m:val="undefined"\/>/g, '')
+    // Remove empty control properties that cause parsing issues in some Word versions
+    .replace(/<m:ctrlPr\/>/g, '')
+    .replace(/<w:rPr\/>/g, '')
+    // Remove inline namespace declarations (will use wrapper's namespaces)
+    .replace(/ xmlns:m="[^"]*"/g, '')
+    .replace(/ xmlns:w="[^"]*"/g, '');
+}
+
 /**
  * Converts MathML string to OMML string using mathml2omml library.
+ * 
  * @param mathml The MathML content string
- * @returns Promise resolving to OMML string
+ * @returns Promise resolving to cleaned OMML string
+ * @see https://github.com/fiduswriter/mathml2omml
  */
 export async function convertMathmlToOmml(mathml: string): Promise<string> {
   try {
-    // The library is synchronous, but we keep the async signature for compatibility 
-    // and potential future changes (e.g. if we move this to a worker).
+    // Convert using mml2omml function
     const omml = mml2omml(mathml);
-    return omml;
+    
+    // Apply fixes for known library issues
+    return cleanOmml(omml);
   } catch (error) {
     console.error('MathML to OMML conversion failed:', error);
     return '';
@@ -25,26 +49,21 @@ export async function convertMathmlToOmml(mathml: string): Promise<string> {
 }
 
 /**
- * Wraps OMML in Word XML clipboard format if needed.
- * This helps Word recognize it when pasting as text.
+ * Wraps OMML for clipboard/paste into Microsoft Word.
+ * Uses Office Open XML namespaces (Office 2007+).
+ * 
+ * @param omml Cleaned OMML string from convertMathmlToOmml
+ * @returns XML string ready for clipboard
  */
 export function wrapOmmlForClipboard(omml: string): string {
-  // Replace 2006 namespaces with 2004/2003 namespaces for Word 2003 XML compatibility
-  // This is necessary because the clipboard format uses the older Word XML structure
-  const compatibleOmml = omml
-    .replace(/http:\/\/schemas\.openxmlformats\.org\/officeDocument\/2006\/math/g, 'http://schemas.microsoft.com/office/2004/12/omml')
-    .replace(/http:\/\/schemas\.openxmlformats\.org\/wordprocessingml\/2006\/main/g, 'http://schemas.microsoft.com/office/word/2003/wordml');
+  // Extract inner content from <m:oMath> tags to avoid nesting
+  const innerContent = omml
+    .replace(/<m:oMath[^>]*>/g, '')
+    .replace(/<\/m:oMath>/g, '');
 
-  // Simple XML declaration wrapper often helps
-  return `<?xml version="1.0"?>
-<?mso-application progid="Word.Document"?>
-<w:wordDocument xmlns:w="http://schemas.microsoft.com/office/word/2003/wordml" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml">
-<w:body>
-<w:p>
-  <m:oMathPara>
-    ${compatibleOmml}
-  </m:oMathPara>
-</w:p>
-</w:body>
-</w:wordDocument>`;
+  // Return with proper Office Open XML structure
+  return `<?xml version="1.0" encoding="UTF-8"?>
+<m:oMath xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math" xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main">
+${innerContent}
+</m:oMath>`;
 }