refactor: move extractDiagramXML function to utils and remove unused file

app/extract_xml.ts

@@ -1,69 +0,0 @@
-import * as pako from 'pako';
-
-export function extractDiagramXML(xml_svg_string: string): string {
-    try {
-        // 1. Parse the SVG string (using built-in DOMParser in a browser-like environment)
-        const svgString = atob(xml_svg_string.slice(26));
-        const parser = new DOMParser();
-        const svgDoc = parser.parseFromString(svgString, "image/svg+xml");
-        const svgElement = svgDoc.querySelector('svg');
-
-        if (!svgElement) {
-            throw new Error("No SVG element found in the input string.");
-        }
-        // 2. Extract the 'content' attribute
-        const encodedContent = svgElement.getAttribute('content');
-
-        if (!encodedContent) {
-            throw new Error("SVG element does not have a 'content' attribute.");
-        }
-
-        // 3. Decode HTML entities (using a minimal function)
-        function decodeHtmlEntities(str: string) {
-            const textarea = document.createElement('textarea'); // Use built-in element
-            textarea.innerHTML = str;
-            return textarea.value;
-        }
-        const xmlContent = decodeHtmlEntities(encodedContent);
-
-        // 4. Parse the XML content
-        const xmlDoc = parser.parseFromString(xmlContent, "text/xml");
-        const diagramElement = xmlDoc.querySelector('diagram');
-
-        if (!diagramElement) {
-            throw new Error("No diagram element found");
-        }
-        // 5. Extract base64 encoded data
-        const base64EncodedData = diagramElement.textContent;
-
-        if (!base64EncodedData) {
-            throw new Error("No encoded data found in the diagram element");
-        }
-
-        // 6. Decode base64 data
-        const binaryString = atob(base64EncodedData);
-
-        // 7. Convert binary string to Uint8Array
-        const len = binaryString.length;
-        const bytes = new Uint8Array(len);
-        for (let i = 0; i < len; i++) {
-            bytes[i] = binaryString.charCodeAt(i);
-        }
-
-        // 8. Decompress data using pako (equivalent to zlib.decompress with wbits=-15)
-        const decompressedData = pako.inflate(bytes, { windowBits: -15 });
-
-        // 9. Convert the decompressed data to a string
-        const decoder = new TextDecoder('utf-8');
-        const decodedString = decoder.decode(decompressedData);
-
-        // Decode URL-encoded content (equivalent to Python's urllib.parse.unquote)
-        const urlDecodedString = decodeURIComponent(decodedString);
-
-        return urlDecodedString;
-
-    } catch (error) {
-        console.error("Error extracting diagram XML:", error);
-        throw error; // Re-throw for caller handling
-    }
-}

contexts/diagram-context.tsx

@@ -2,7 +2,7 @@
 
 import React, { createContext, useContext, useRef, useState } from "react";
 import type { DrawIoEmbedRef } from "react-drawio";
-import { extractDiagramXML } from "@/app/extract_xml";
+import { extractDiagramXML } from "../lib/utils";
 
 interface DiagramContextType {
     chartXML: string;

lib/utils.ts

@@ -1,5 +1,6 @@
 import { clsx, type ClassValue } from "clsx"
 import { twMerge } from "tailwind-merge"
+import * as pako from 'pako';
 
 export function cn(...inputs: ClassValue[]) {
   return twMerge(clsx(inputs))
@@ -127,3 +128,73 @@ export function replaceNodes(currentXML: string, nodes: string): string {
     throw new Error(`Error replacing nodes: ${error}`);
   }
 }
+
+
+
+export function extractDiagramXML(xml_svg_string: string): string {
+  try {
+    // 1. Parse the SVG string (using built-in DOMParser in a browser-like environment)
+    const svgString = atob(xml_svg_string.slice(26));
+    const parser = new DOMParser();
+    const svgDoc = parser.parseFromString(svgString, "image/svg+xml");
+    const svgElement = svgDoc.querySelector('svg');
+
+    if (!svgElement) {
+      throw new Error("No SVG element found in the input string.");
+    }
+    // 2. Extract the 'content' attribute
+    const encodedContent = svgElement.getAttribute('content');
+
+    if (!encodedContent) {
+      throw new Error("SVG element does not have a 'content' attribute.");
+    }
+
+    // 3. Decode HTML entities (using a minimal function)
+    function decodeHtmlEntities(str: string) {
+      const textarea = document.createElement('textarea'); // Use built-in element
+      textarea.innerHTML = str;
+      return textarea.value;
+    }
+    const xmlContent = decodeHtmlEntities(encodedContent);
+
+    // 4. Parse the XML content
+    const xmlDoc = parser.parseFromString(xmlContent, "text/xml");
+    const diagramElement = xmlDoc.querySelector('diagram');
+
+    if (!diagramElement) {
+      throw new Error("No diagram element found");
+    }
+    // 5. Extract base64 encoded data
+    const base64EncodedData = diagramElement.textContent;
+
+    if (!base64EncodedData) {
+      throw new Error("No encoded data found in the diagram element");
+    }
+
+    // 6. Decode base64 data
+    const binaryString = atob(base64EncodedData);
+
+    // 7. Convert binary string to Uint8Array
+    const len = binaryString.length;
+    const bytes = new Uint8Array(len);
+    for (let i = 0; i < len; i++) {
+      bytes[i] = binaryString.charCodeAt(i);
+    }
+
+    // 8. Decompress data using pako (equivalent to zlib.decompress with wbits=-15)
+    const decompressedData = pako.inflate(bytes, { windowBits: -15 });
+
+    // 9. Convert the decompressed data to a string
+    const decoder = new TextDecoder('utf-8');
+    const decodedString = decoder.decode(decompressedData);
+
+    // Decode URL-encoded content (equivalent to Python's urllib.parse.unquote)
+    const urlDecodedString = decodeURIComponent(decodedString);
+
+    return urlDecodedString;
+
+  } catch (error) {
+    console.error("Error extracting diagram XML:", error);
+    throw error; // Re-throw for caller handling
+  }
+}