move selection updating code out of selection, to DynamicSelectionList

this avoids a lot of unnecessary (add|remove)_change_listener as
creating temporary Selections do not call that anymore.

Use can choose between a SelectionList which or a DynamicSelectionList
depending on wethear the buffer will be modified or not during the
selections lifetime.

1 files changed, 81 insertions, 0 deletions

diff --git a/src/dynamic_selection_list.cc b/src/dynamic_selection_list.cc
new file mode 100644
index 00000000..e1a78168
--- /dev/null
+++ b/src/dynamic_selection_list.cc
@@ -0,0 +1,81 @@
+#include "dynamic_selection_list.hh"
+
+namespace Kakoune
+{
+
+DynamicSelectionList::DynamicSelectionList(const Buffer& buffer,
+                                           SelectionList selections)
+    : m_buffer(&buffer), m_selections(std::move(selections))
+{
+    m_buffer->add_change_listener(*this);
+}
+
+DynamicSelectionList::~DynamicSelectionList()
+{
+    m_buffer->remove_change_listener(*this);
+}
+
+DynamicSelectionList::DynamicSelectionList(const DynamicSelectionList& other)
+    : m_selections(other.m_selections), m_buffer(other.m_buffer)
+{
+    m_buffer->add_change_listener(*this);
+}
+
+DynamicSelectionList& DynamicSelectionList::operator=(const DynamicSelectionList& other)
+{
+    m_selections = other.m_selections;
+    if (m_buffer != other.m_buffer)
+    {
+        m_buffer->remove_change_listener(*this);
+        m_buffer = other.m_buffer;
+        m_buffer->add_change_listener(*this);
+    }
+    return *this;
+}
+
+DynamicSelectionList::DynamicSelectionList(DynamicSelectionList&& other)
+    : m_selections(std::move(other.m_selections)), m_buffer(other.m_buffer)
+{
+    m_buffer->add_change_listener(*this);
+}
+
+DynamicSelectionList& DynamicSelectionList::operator=(DynamicSelectionList&& other)
+{
+    m_selections = std::move(other.m_selections);
+    if (m_buffer != other.m_buffer)
+    {
+        m_buffer->remove_change_listener(*this);
+        m_buffer = other.m_buffer;
+        m_buffer->add_change_listener(*this);
+    }
+    return *this;
+}
+
+void DynamicSelectionList::reset(SelectionList selections)
+{
+    for (auto& sel : selections)
+        assert(&sel.buffer() == m_buffer);
+     m_selections = std::move(selections);
+}
+
+void DynamicSelectionList::on_insert(const BufferIterator& begin, const BufferIterator& end)
+{
+    for (auto& sel : m_selections)
+    {
+        sel.first().on_insert(begin.coord(), end.coord());
+        sel.last().on_insert(begin.coord(), end.coord());
+        sel.check_invariant();
+    }
+}
+
+void DynamicSelectionList::on_erase(const BufferIterator& begin, const BufferIterator& end)
+{
+    for (auto& sel : m_selections)
+    {
+        sel.first().on_erase(begin.coord(), end.coord());
+        sel.last().on_erase(begin.coord(), end.coord());
+        sel.check_invariant();
+    }
+}
+
+}