Refacter the way to get node tag

Author: vidy

src/flow.rs

@@ -268,7 +268,7 @@ pub(crate) fn build<E: Encoder>(mut flow: &mut Flow, spans: &[TextSpan<E>], node
                                 });
                                 para_start = line_start;
                             }
-                            //Always add a line break for new line, which will be treated as whitespace in concat_text method
+                            //Always add a line break for new line, which will be treated as whitespace in the concat_text method
                             text.push('\n');
                         }
                         if end > line_start {

src/node.rs

@@ -200,20 +200,10 @@ fn split<E: Encoder>(boxes: &mut [(RectF, usize)], spans: &[TextSpan<E>], lines:
         }
     }
 
-    let tag = if y_gaps.len() == 0 {
-        if cells.iter().all(|n| n.tag() <= NodeTag::Line) {
-            NodeTag::Line
-        } else {
-            NodeTag::Complex
-        }
-    } else if x_gaps.len() == 0 {
-        if cells.iter().all(|n| n.tag() <= NodeTag::Line) {
-            NodeTag::Paragraph
-        } else {
-            NodeTag::Complex
-        }
-    } else {
-        NodeTag::Complex
+    let tag = match (y_gaps.is_empty(), x_gaps.is_empty()) {
+        (true, _) if cells.iter().all(|n| n.tag() <= NodeTag::Line) => NodeTag::Line,
+        (_, true) if cells.iter().all(|n| n.tag() <= NodeTag::Line) => NodeTag::Paragraph,
+        _ => NodeTag::Complex
     };
 
     Node::Grid {