From 2bb5c3d83132a711e91f033aabe80fdba7ef8f1d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=C3=A9a=20Saviot?= <lea.saviot@numworks.com>
Date: Fri, 13 Jul 2018 10:53:18 +0200
Subject: [PATCH] [poincare] LayoutCursor::addEmptyExponentialLayout

---
 poincare/include/poincare/layout_cursor.h  |  2 +-
 poincare/include/poincare/tree_reference.h |  4 ++++
 poincare/src/layout_cursor.cpp             | 12 ++++++++++++
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/poincare/include/poincare/layout_cursor.h b/poincare/include/poincare/layout_cursor.h
index 761649306..8bb911329 100644
--- a/poincare/include/poincare/layout_cursor.h
+++ b/poincare/include/poincare/layout_cursor.h
@@ -107,7 +107,7 @@ public:
   }
 
   /* Layout modification */
-  void addEmptyExponentialLayout() {} //TODO
+  void addEmptyExponentialLayout();
   void addEmptyMatrixLayout() {} //TODO
   void addEmptyPowerLayout();
   void addEmptySquareRootLayout() {} //TODO
diff --git a/poincare/include/poincare/tree_reference.h b/poincare/include/poincare/tree_reference.h
index d4e0d4bdc..096dab0ae 100644
--- a/poincare/include/poincare/tree_reference.h
+++ b/poincare/include/poincare/tree_reference.h
@@ -91,6 +91,10 @@ public:
     assert(isDefined());
     return node()->hasSibling(t.node());
   }
+  bool hasAncestor(TreeReference<TreeNode> t, bool includeSelf) const {
+    assert(isDefined());
+    return node()->hasAncestor(t.node(), includeSelf);
+  }
   int numberOfChildren() const {
     assert(isDefined());
     return node()->numberOfChildren();
diff --git a/poincare/src/layout_cursor.cpp b/poincare/src/layout_cursor.cpp
index abbf723d0..7957eb7f5 100644
--- a/poincare/src/layout_cursor.cpp
+++ b/poincare/src/layout_cursor.cpp
@@ -65,6 +65,18 @@ void LayoutCursor::moveUnder(bool * shouldRecomputeLayout) {
 
 /* Layout modification */
 
+void LayoutCursor::addEmptyExponentialLayout() {
+  EmptyLayoutRef emptyLayout;
+  HorizontalLayoutRef sibling = HorizontalLayoutRef(
+      CharLayoutRef(Ion::Charset::Exponential),
+      VerticalOffsetLayoutRef(emptyLayout, VerticalOffsetLayoutNode::Type::Superscript));
+  LayoutRef rootRef = m_layoutRef.root();
+  m_layoutRef.addSibling(this, sibling, false);
+  if (emptyLayout.hasAncestor(rootRef, false) && !emptyLayout.isAllocationFailure()) {
+    m_layoutRef = emptyLayout;
+  }
+}
+
 void LayoutCursor::addEmptyPowerLayout() {
   VerticalOffsetLayoutRef offsetLayout = VerticalOffsetLayoutRef(EmptyLayoutRef(), VerticalOffsetLayoutNode::Type::Superscript);
   privateAddEmptyPowerLayout(offsetLayout);