From 3cd15cdcf2a2d6e81a296831323c57981fececfc Mon Sep 17 00:00:00 2001
From: Knut Sveidqvist <knsv@sveido.com>
Date: Thu, 19 Jan 2023 20:50:36 +0100
Subject: [PATCH] #4012 Handling rows with only spaces in them

---
 packages/mermaid-mindmap/src/mindmap.spec.js      | 12 ++++++++++++
 packages/mermaid-mindmap/src/parser/mindmap.jison |  5 ++++-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/packages/mermaid-mindmap/src/mindmap.spec.js b/packages/mermaid-mindmap/src/mindmap.spec.js
index e3f018350..2a2dd13bb 100644
--- a/packages/mermaid-mindmap/src/mindmap.spec.js
+++ b/packages/mermaid-mindmap/src/mindmap.spec.js
@@ -347,4 +347,16 @@ root
     expect(child.children.length).toEqual(2);
     expect(child.children[1].nodeId).toEqual('b');
   });
+  it('MMP-23 Rows with only spaces should not interfere', function () {
+    let str = 'mindmap\nroot\n A\n \n\n B';
+    mindmap.parse(str);
+    const mm = mindmap.yy.getMindmap();
+    expect(mm.nodeId).toEqual('root');
+    expect(mm.children.length).toEqual(2);
+
+    const child = mm.children[0];
+    expect(child.nodeId).toEqual('A');
+    const child2 = mm.children[1];
+    expect(child2.nodeId).toEqual('B');
+  });
 });
diff --git a/packages/mermaid-mindmap/src/parser/mindmap.jison b/packages/mermaid-mindmap/src/parser/mindmap.jison
index a96ee6261..651d9dc09 100644
--- a/packages/mermaid-mindmap/src/parser/mindmap.jison
+++ b/packages/mermaid-mindmap/src/parser/mindmap.jison
@@ -25,6 +25,7 @@
 <CLASS>\n				   { this.popState();}
 // [\s]*"::icon("   { this.begin('ICON'); }
 "::icon("   { yy.getLogger().trace('Begin icon');this.begin('ICON'); }
+[\s]+[\n]     {yy.getLogger().trace('SPACELINE');return 'SPACELINE'                 /* skip all whitespace */    ;}
 [\n]+               return 'NL';
 <ICON>[^\)]+			 { return 'ICON'; }
 <ICON>\)				   {yy.getLogger().trace('end icon');this.popState();}
@@ -72,6 +73,7 @@ start
 stop
   : NL {yy.getLogger().trace('Stop NL ');}
   | EOF {yy.getLogger().trace('Stop EOF ');}
+  | SPACELINE
   | stop NL {yy.getLogger().trace('Stop NL2 ');}
   | stop EOF {yy.getLogger().trace('Stop EOF2 ');}
   ;
@@ -81,9 +83,10 @@ document
 	;
 
 statement
-	: SPACELIST node       { yy.getLogger().trace('Node: ',$2.id);yy.addNode($1.length, $2.id, $2.descr, $2.type);  }
+	: SPACELIST node       { yy.getLogger().info('Node: ',$2.id);yy.addNode($1.length, $2.id, $2.descr, $2.type);  }
 	| SPACELIST ICON       { yy.getLogger().trace('Icon: ',$2);yy.decorateNode({icon: $2}); }
 	| SPACELIST CLASS      { yy.decorateNode({class: $2}); }
+  | SPACELINE { yy.getLogger().trace('SPACELIST');}
 	| node					       { yy.getLogger().trace('Node: ',$1.id);yy.addNode(0, $1.id, $1.descr, $1.type);  }
 	| ICON                 { yy.decorateNode({icon: $1}); }
 	| CLASS                { yy.decorateNode({class: $1}); }