feat: 用分支语句重写了封面多行标题的判断

coverinfo.sty

@@ -3,7 +3,6 @@
 \tl_const:Nn \TitleA {曲率引擎的研究}% 第一行标题
 \tl_const:Nn \TitleB {}% 第二行标题
 \tl_const:Nn \TitleC {}% 第三行标题
-\tl_const:Nn \Title {\TitleA\TitleB\TitleC}
 \tl_const:Nn \Title_EN {Curvature~engine~research}
 \tl_const:Nn \Grade {2017}
 \tl_const:Nn \StudentID {17184xxx}
@@ -18,5 +17,3 @@
 \tl_const:Nn \MentorTitle {教授}
 \tl_const:Nn \MentorTitle_EN {Professor}
 \tl_const:Nn \SubmitDate {2077年12月31日}
-\tl_const:Nn \Degree {UG}% 学位 本科：UG
-\tl_const:Nn \Type {thesis}% thesis：毕业论文，design:毕业设计
\ No newline at end of file

njuthesis.cls

@@ -21,6 +21,8 @@
   ]{ctexbook}[2018/04/01]
 
 \DeclareStringOption[1]{TitleLength}
+\DeclareStringOption[UG]{Degree}
+\DeclareStringOption[thesis]{Type}
 
 \ProcessKeyvalOptions*\relax
 

njuthesis.tex

 \documentclass[
     TitleLength=1,% 选择标题行数，范围是1~3
+    Degree=UG,% 学位 本科：UG
+    Type=thesis% thesis：毕业论文，design:毕业设计
 ]{njuthesis}
 
 \addbibresource{njuthesis.bib}

profile/abstract.sty

-\ProvidesExplPackage{profile/abstract}{2021-09-04}{0.1}{NJU Thesis Undergraduate abstract design} 
+\ProvidesExplPackage{profile/abstract}{2021-09-04}{0.1}{NJU Thesis Undergraduate abstract design}
+
+% 拼合标题
+\tl_const:Nn \Title {\TitleA\TitleB\TitleC}
 
 % 摘要环境
 \NewDocumentEnvironment{abstract} {}

profile/cover.sty

@@ -19,20 +19,21 @@
     \coverbox:n {专\hfill 业}
     & \cover_underline:nn {250pt}{\songti\Major}\\
 
-    \coverbox:n {题\hfill 目}
-    & \cover_underline:nn {250pt}{\textbf{\songti\TitleA}} \\
-
-    \int_compare:nNnTF { \TitleLength } = { 2 }  { 
-      \coverbox:n {\hfill}
-      & \cover_underline:nn {250pt}{\textbf{\songti\TitleB}} \\
-    }{}
-    
-    \int_compare:nNnTF { \TitleLength } = { 3 }  { 
-      \coverbox:n {\hfill}
-      & \cover_underline:nn {250pt}{\textbf{\songti\TitleB}} \\
-      \coverbox:n {\hfill}
-      & \cover_underline:nn {250pt}{\textbf{\songti\TitleC}} \\
-    }{}
+    \int_case:nn {\TitleLength}
+      {
+        { 1 } { 
+          \coverbox:n {题\hfill 目}
+          & \cover_underline:nn {250pt}{\textbf{\songti\TitleA}} \\ }
+        { 2 } {
+          \coverbox:n {题\hfill 目}
+          & \cover_underline:nn {250pt}{\textbf{\songti\TitleA}} \\
+          & \cover_underline:nn {250pt}{\textbf{\songti\TitleB}} \\ }
+        { 3 } { 
+          \coverbox:n {题\hfill 目}
+          & \cover_underline:nn {250pt}{\textbf{\songti\TitleA}} \\
+          & \cover_underline:nn {250pt}{\textbf{\songti\TitleB}} \\
+          & \cover_underline:nn {250pt}{\textbf{\songti\TitleC}} \\}
+      }
   \end{tabular}\\
 
   \begin{tabular}{p{4.2em}cp{4.2em}c}
@@ -68,6 +69,10 @@
 }
 
 % 判断类型
+\int_compare:nNnTF { \TitleLength } = { 2 }  { 
+      \coverbox:n {\hfill}
+      & \cover_underline:nn {250pt}{\textbf{\songti\TitleB}} \\
+    }{}
 \ifthenelse{\equal{\Degree}{UG}}
 {
   \NewDocumentCommand \Degreename {} {\hfill 本\hfill 科\hfill }