fix: Qt.btoa warning

Signed-off-by: Patrizio Bekerle <patrizio@bekerle.com>

Author: pbek

latex-math/info.json

@@ -2,7 +2,7 @@
   "name": "Latex Math",
   "identifier": "latex-math",
   "script": "latex-math.qml",
-  "version": "0.0.6",
+  "version": "0.0.7",
   "platforms": ["linux", "macos", "windows"],
   "minAppVersion": "20.8.0",
   "authors": ["@r00tr4v3n", "@Aganel"],

latex-math/latex-math.qml

@@ -121,7 +121,7 @@ QtObject {
     }
     function getBashCmd(path, latexBase64) {
         const exec = executable;
-        const preamble = Qt.btoa(getPreamble());
+        const preamble = toBase64(getPreamble());
         const quiet = " --quiet 1"; // --quiet OFF does not work (klatexformula bug?)
         const cmd = `"${exec}" -f "${formulaColor}" -b "${formulaBgColor}" --base64arg --preamble="${preamble}" --base64arg --latexinput="${latexBase64}" --dpi ${settingDPI} ${quiet} --output ${path}`;
         //log("cmd: "+cmd)
@@ -155,6 +155,55 @@ QtObject {
         }
     }
 
+    /**
+     * Encodes a string as base64 of its UTF-8 representation
+     *
+     * This replaces the deprecated Qt.btoa(string) call, which emits a
+     * deprecation warning in newer Qt versions
+     *
+     * @param {string} text - the text to encode
+     * @return {string} the base64 encoded text
+     */
+    function toBase64(text) {
+        const alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+        var bytes = [];
+
+        // encode the string as UTF-8
+        for (var i = 0; i < text.length; i++) {
+            var cp = text.codePointAt(i);
+
+            if (cp > 0xFFFF) {
+                // skip the low surrogate of the surrogate pair
+                i++;
+            }
+
+            if (cp < 0x80) {
+                bytes.push(cp);
+            } else if (cp < 0x800) {
+                bytes.push(0xC0 | (cp >> 6), 0x80 | (cp & 0x3F));
+            } else if (cp < 0x10000) {
+                bytes.push(0xE0 | (cp >> 12), 0x80 | ((cp >> 6) & 0x3F), 0x80 | (cp & 0x3F));
+            } else {
+                bytes.push(0xF0 | (cp >> 18), 0x80 | ((cp >> 12) & 0x3F), 0x80 | ((cp >> 6) & 0x3F), 0x80 | (cp & 0x3F));
+            }
+        }
+
+        var result = "";
+
+        for (var j = 0; j < bytes.length; j += 3) {
+            const b0 = bytes[j];
+            const b1 = j + 1 < bytes.length ? bytes[j + 1] : -1;
+            const b2 = j + 2 < bytes.length ? bytes[j + 2] : -1;
+
+            result += alphabet[b0 >> 2];
+            result += alphabet[((b0 & 0x03) << 4) | (b1 < 0 ? 0 : b1 >> 4)];
+            result += b1 < 0 ? "=" : alphabet[((b1 & 0x0F) << 2) | (b2 < 0 ? 0 : b2 >> 6)];
+            result += b2 < 0 ? "=" : alphabet[b2 & 0x3F];
+        }
+
+        return result;
+    }
+
     /**
      * This function is called when the markdown html of a note is generated
      *
@@ -183,7 +232,7 @@ QtObject {
 
             latex = formulaPrefix + latex; // add prefix from settings
             latex = latex.trim();
-            const latexBase64 = Qt.btoa(latex);
+            const latexBase64 = toBase64(latex);
             const filename = Qt.md5(latex);
             const path = workDir + "/" + filename + ".png";
 

mermaid/info.json

@@ -4,7 +4,7 @@
   "script": "mermaid.qml",
   "authors": ["@dohliam", "@cyclops1982"],
   "platforms": ["linux", "macos", "windows"],
-  "version": "0.0.4",
+  "version": "0.0.5",
   "minAppVersion": "22.1.1",
   "description": "Support for rendering mermaid diagrams in mermaid code blocks as image. Uses the external API from <a href='https://mermaid.ink/'>mermaid.ink</a>."
 }

mermaid/mermaid.qml

@@ -2,6 +2,55 @@ import QtQml 2.0
 import QOwnNotesTypes 1.0
 
 QtObject {
+    /**
+    * Encodes a string as base64 of its UTF-8 representation
+    *
+    * This replaces the deprecated Qt.btoa(string) call, which emits a
+    * deprecation warning in newer Qt versions
+    *
+    * @param {string} text - the text to encode
+    * @return {string} the base64 encoded text
+    */
+    function toBase64(text) {
+        const alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+        var bytes = [];
+
+        // encode the string as UTF-8
+        for (var i = 0; i < text.length; i++) {
+            var cp = text.codePointAt(i);
+
+            if (cp > 0xFFFF) {
+                // skip the low surrogate of the surrogate pair
+                i++;
+            }
+
+            if (cp < 0x80) {
+                bytes.push(cp);
+            } else if (cp < 0x800) {
+                bytes.push(0xC0 | (cp >> 6), 0x80 | (cp & 0x3F));
+            } else if (cp < 0x10000) {
+                bytes.push(0xE0 | (cp >> 12), 0x80 | ((cp >> 6) & 0x3F), 0x80 | (cp & 0x3F));
+            } else {
+                bytes.push(0xF0 | (cp >> 18), 0x80 | ((cp >> 12) & 0x3F), 0x80 | ((cp >> 6) & 0x3F), 0x80 | (cp & 0x3F));
+            }
+        }
+
+        var result = "";
+
+        for (var j = 0; j < bytes.length; j += 3) {
+            const b0 = bytes[j];
+            const b1 = j + 1 < bytes.length ? bytes[j + 1] : -1;
+            const b2 = j + 2 < bytes.length ? bytes[j + 2] : -1;
+
+            result += alphabet[b0 >> 2];
+            result += alphabet[((b0 & 0x03) << 4) | (b1 < 0 ? 0 : b1 >> 4)];
+            result += b1 < 0 ? "=" : alphabet[((b1 & 0x0F) << 2) | (b2 < 0 ? 0 : b2 >> 6)];
+            result += b2 < 0 ? "=" : alphabet[b2 & 0x3F];
+        }
+
+        return result;
+    }
+
     /**
     * This function is called before the markdown html of a note is generated
     *
@@ -20,7 +69,7 @@ QtObject {
     function preNoteToMarkdownHtmlHook(note, markdown, forExport) {
         var re = /```mermaid\n([\s\S]*?)\n```/gim;
         markdown = markdown.replace(re, function (_, diag) {
-            var encodedData = Qt.btoa(diag);
+            var encodedData = toBase64(diag);
             var ink = '![](https://mermaid.ink/img/' + encodedData + ')';
             return ink;
         });