From 3f7c85e5c7f4dc7958e0bd88940a41032519e0e1 Mon Sep 17 00:00:00 2001
From: syvshc <syvshc@foxmail.com>
Date: Fri, 6 May 2022 12:40:09 +0800
Subject: [PATCH] fix #194

---
 elegantbook.cls | 45 ++++++++++++++++++++++++++++++---------------
 1 file changed, 30 insertions(+), 15 deletions(-)

diff --git a/elegantbook.cls b/elegantbook.cls
index 4c2b7a6..9ac0eca 100644
--- a/elegantbook.cls
+++ b/elegantbook.cls
@@ -920,15 +920,18 @@
           \textcolor{third}{$\spadesuit$}};}},}
   % \newtcbtheorem[auto counter,number within=chapter]{definition}{\definitionname}{defstyle}{def}
   \DeclareTColorBox[auto counter,number within=\ELEGANT@thmcnt]{definition}{ g o t\label g }{
-    common,defstyle,
-    IfValueTF={#1}
-      {title={\definitionname~\thetcbcounter\ (#1)}}
-      {
-        IfValueTF={#2} 
-          {title={\definitionname~\thetcbcounter\ (#2)}}
-          {title=\definitionname~\thetcbcounter}
-      },
-    IfBooleanTF={#3}{label={#4}}{label={def:#4}}}
+      common,defstyle,
+      IfValueTF={#1}
+        {title={\definitionname~\thetcbcounter\ (#1)}}
+        {
+          IfValueTF={#2} 
+            {title={\definitionname~\thetcbcounter\ (#2)}}
+            {title=\definitionname~\thetcbcounter}
+        },
+      IfValueT={#4}
+        {IfBooleanTF={#3}{label={#4}}{label={def:#4}}}
+      }
+    
   % \newtcbtheorem[auto counter,number within=chapter]{theorem}{\theoremname}{thmstyle}{thm}
   \DeclareTColorBox[auto counter,number within=\ELEGANT@thmcnt]{theorem}{ g o t\label g }{
     common,thmstyle,
@@ -939,7 +942,9 @@
           {title={\theoremname~\thetcbcounter\ (#2)}}
           {title=\theoremname~\thetcbcounter}
       },
-    IfBooleanTF={#3}{label={#4}}{label={thm:#4}}}
+    IfValueT={#4}
+      {IfBooleanTF={#3}{label={#4}}{label={thm:#4}}}
+    }
   % \newtcbtheorem[auto counter,number within=chapter]{postulate}{\postulatename}{thmstyle}{pos}
   \DeclareTColorBox[auto counter,number within=\ELEGANT@thmcnt]{postulate}{ g o t\label g }{
     common,thmstyle,
@@ -950,7 +955,9 @@
           {title={\postulatename~\thetcbcounter\ (#2)}}
           {title=\postulatename~\thetcbcounter}
       },
-    IfBooleanTF={#3}{label={#4}}{label={pos:#4}}}
+    IfValueT={#4}
+      {IfBooleanTF={#3}{label={#4}}{label={pos:#4}}}
+    }
   % \newtcbtheorem[auto counter,number within=chapter]{axiom}{\axiomname}{thmstyle}{axi}
   \DeclareTColorBox[auto counter,number within=\ELEGANT@thmcnt]{axiom}{ g o t\label g }{
     common,thmstyle,
@@ -961,7 +968,9 @@
           {title={\axiomname~\thetcbcounter\ (#2)}}
           {title=\axiomname~\thetcbcounter}
       },
-    IfBooleanTF={#3}{label={#4}}{label={axi:#4}}}
+    IfValueT={#4}
+      {IfBooleanTF={#3}{label={#4}}{label={axi:#4}}}
+    }
   % \newtcbtheorem[auto counter,number within=chapter]{corollary}{\corollaryname}{thmstyle}{cor}
   \DeclareTColorBox[auto counter,number within=\ELEGANT@thmcnt]{corollary}{ g o t\label g }{
     common,thmstyle,
@@ -972,7 +981,9 @@
           {title={\corollaryname~\thetcbcounter\ (#2)}}
           {title=\corollaryname~\thetcbcounter}
       },
-    IfBooleanTF={#3}{label={#4}}{label={cor:#4}}}
+    IfValueT={#4}
+      {IfBooleanTF={#3}{label={#4}}{label={cor:#4}}}
+    }
   % \newtcbtheorem[auto counter,number within=chapter]{lemma}{\lemmaname}{thmstyle}{lem}
   \DeclareTColorBox[auto counter,number within=\ELEGANT@thmcnt]{lemma}{ g o t\label g }{
     common,thmstyle,
@@ -983,7 +994,9 @@
           {title={\lemmaname~\thetcbcounter\ (#2)}}
           {title=\lemmaname~\thetcbcounter}
       },
-    IfBooleanTF={#3}{label={#4}}{label={lem:#4}}}
+    IfValueT={#4}
+      {IfBooleanTF={#3}{label={#4}}{label={lem:#4}}}
+    }
   % \newtcbtheorem[auto counter,number within=chapter]{proposition}{\propositionname}{propstyle}{pro}
   \DeclareTColorBox[auto counter,number within=\ELEGANT@thmcnt]{proposition}{ g o t\label g }{
     common,propstyle,
@@ -994,7 +1007,9 @@
           {title={\propositionname~\thetcbcounter\ (#2)}}
           {title=\propositionname~\thetcbcounter}
       },
-    IfBooleanTF={#3}{label={#4}}{label={pro:#4}}}
+    IfValueT={#4}
+        {IfBooleanTF={#3}{label={#4}}{label={pro:#4}}}
+    }
 }{\relax}