refactor: make vertical digit conersion more robust

app/src/main/assets/process_text_nodes.js

@@ -1,7 +1,8 @@
 function convertToVerticalStyle(node) {
     if (node.nodeType === Node.TEXT_NODE) {
-        let text = node.nodeValue;
-        const regex = /(\d{1,4}\.?|[a-zA-Z]{1,50}\.?)/g;
+        let text = convertToFullWidth(node.nodeValue);
+        // 1.1 | 1. | 2024 | a.
+        const regex = /(\b\d\.\d\b|\d{1}\.(?=\s|\b)|\d{1,4}|\b[a-zA-Z]\.)/g;
         let match;
         let lastIndex = 0;
         const fragment = document.createDocumentFragment();
@@ -10,20 +11,22 @@ function convertToVerticalStyle(node) {
             // exclude english words longer than 2 characters, e.g. "Hello" but keep a. b. c.
             if (match[0].length > 1 && isLetter(match[0][0]) && isLetter(match[0][1])) { continue }
 
-            // digits longer than 4 characters are excluded, e.g. 12345, keep 2024 similar year numbers
-            if (match[0].length > 2) {
-                if (lastIndex < match.index) {
-                    fragment.appendChild(document.createTextNode(text.slice(lastIndex, match.index)));
-                }
+            // digits longer than 3 characters , e.g. 12345, keep 2024 similar year numbers
+            if (match[0].length >= 3) {
+                if (match[0][1] != '.') {
+                    if (lastIndex < match.index) {
+                        fragment.appendChild(document.createTextNode(text.slice(lastIndex, match.index)));
+                    }
 
-                // Create span element for the matched part
-                const span = document.createElement('span');
-                span.className = 'verticalSingleChr';
-                span.textContent = match[0];
-                fragment.appendChild(span);
+                    // Create span element for the matched part
+                    const span = document.createElement('span');
+                    span.className = 'verticalSingleChr';
+                    span.textContent = match[0];
+                    fragment.appendChild(span);
 
-                lastIndex = regex.lastIndex;
-                continue;
+                    lastIndex = regex.lastIndex;
+                    continue;
+                }
             }
             // Create text node for the part before the match
             if (lastIndex < match.index) {
@@ -52,6 +55,10 @@ function convertToVerticalStyle(node) {
     }
 }
 
+function convertToFullWidth(str) {
+  return str.replace(/%/g, '％');
+}
+
 function isLetter(char) {
     return /[a-zA-Z]/.test(char); // Returns true if the character is a letter
 }