From 497a2a39cf02a6be9a2b60c7a332f9a7542882b1 Mon Sep 17 00:00:00 2001
From: Willem Jiang <willem.jiang@gmail.com>
Date: Fri, 17 Oct 2025 15:34:43 +0800
Subject: [PATCH] fix:the formual display error after report editing (#627)

---
 web/src/core/utils/markdown.ts         | 34 ++++++++++++++++++++++++++
 web/tests/markdown-math-editor.test.ts | 12 +++++++++
 2 files changed, 46 insertions(+)

diff --git a/web/src/core/utils/markdown.ts b/web/src/core/utils/markdown.ts
index 50add92..04888d7 100644
--- a/web/src/core/utils/markdown.ts
+++ b/web/src/core/utils/markdown.ts
@@ -21,6 +21,23 @@ export function normalizeMathForEditor(markdown: string): string {
     .replace(/\\\\\(([^)]*)\\\\\)/g, (_match, content) => `$${content}$`)  // \\(...\\) → $...$
     .replace(/\\\(([^)]*)\\\)/g, (_match, content) => `$${content}$`);    // \(...\) → $...$
   
+  // Replace double backslashes with single in math contexts
+  // For inline math: $...$
+  normalized = normalized.replace(
+    /\$([^\$]+?)\$/g,
+    (match, mathContent) => {
+      return `$${mathContent.replace(/\\\\/g, '\\')}$`;
+    }
+  );
+  
+  // For display math: $$...$$
+  normalized = normalized.replace(
+    /\$\$([\s\S]+?)\$\$/g,
+    (match, mathContent) => {
+      return `$$${mathContent.replace(/\\\\/g, '\\')}$$`;
+    }
+  );
+
   return normalized;
 }
 
@@ -41,6 +58,23 @@ export function normalizeMathForDisplay(markdown: string): string {
     .replace(/\\\\\(([^)]*)\\\\\)/g, (_match, content) => `$$${content}$$`)   // \\(...\\) → $$...$$
     .replace(/\\\(([^)]*)\\\)/g, (_match, content) => `$$${content}$$`);       // \(...\) → $$...$$
   
+  // Replace double backslashes with single in math contexts
+  // For inline math: $...$
+  normalized = normalized.replace(
+    /\$([^\$]+?)\$/g,
+    (match, mathContent) => {
+      return `$${mathContent.replace(/\\\\/g, '\\')}$`;
+    }
+  );
+  
+  // For display math: $$...$$
+  normalized = normalized.replace(
+    /\$\$([\s\S]+?)\$\$/g,
+    (match, mathContent) => {
+      return `$$${mathContent.replace(/\\\\/g, '\\')}$$`;
+    }
+  );
+    
   return normalized;
 }
 
diff --git a/web/tests/markdown-math-editor.test.ts b/web/tests/markdown-math-editor.test.ts
index 372eee4..ccdf992 100644
--- a/web/tests/markdown-math-editor.test.ts
+++ b/web/tests/markdown-math-editor.test.ts
@@ -10,6 +10,18 @@ describe("markdown math normalization for editor", () => {
     assert.strictEqual(output, "Here is a formula $$E=mc^2$$ in the text.");
   });
 
+  it("converts LaTeX display delimiters to $ with \\ for editor", () => {
+    const input = "Here is a formula \\(F = k\\frac{q_1q_2}{r^2}\\) in the text.";
+    const output = normalizeMathForEditor(input);
+    assert.strictEqual(output, "Here is a formula $F = k\\frac{q_1q_2}{r^2}$ in the text.");
+  });
+
+  it("converts LaTeX display delimiters to $ with \\\\ for editor", () => {
+    const input = "Here is a formula \\(F = k\\\\frac{q_1q_2}{r^2}\\) in the text.";
+    const output = normalizeMathForEditor(input);
+    assert.strictEqual(output, "Here is a formula $F = k\\frac{q_1q_2}{r^2}$ in the text.");
+  });
+
   it("converts escaped LaTeX display delimiters to $$ for editor", () => {
     const input = "Formula \\\\[x^2 + y^2 = z^2\\\\] here.";
     const output = normalizeMathForEditor(input);