[shared] Clean unused classes

apps/shared/expression_model.cpp

@@ -1,59 +0,0 @@
-#include "function.h"
-#include "poincare_helpers.h"
-#include <string.h>
-#include <cmath>
-#include <assert.h>
-
-using namespace Poincare;
-
-namespace Shared {
-
-ExpressionModel::ExpressionModel() :
-  m_text{0},
-  m_expression(),
-  m_layout()
-{
-}
-
-const char * ExpressionModel::text() const {
-  return m_text;
-}
-
-Poincare::Expression ExpressionModel::expression(Poincare::Context * context) const {
-  if (m_expression.isUninitialized()) {
-    m_expression = PoincareHelpers::ParseAndSimplify(m_text, *context);
-  }
-  return m_expression;
-}
-
-Layout ExpressionModel::layout() {
-  if (m_layout.isUninitialized()) {
-    Expression nonSimplifiedExpression = Expression::Parse(m_text);
-    m_layout = PoincareHelpers::CreateLayout(nonSimplifiedExpression);
-  }
-  return m_layout;
-}
-
-bool ExpressionModel::isDefined() {
-  return m_text[0] != 0;
-}
-
-bool ExpressionModel::isEmpty() {
-  return m_text[0] == 0;
-}
-
-void ExpressionModel::setContent(const char * c) {
-  strlcpy(m_text, c, sizeof(m_text));
-  /* We cannot call tidy here because tidy is a virtual function and does not
-   * do the same thing for all children class. And here we want to delete only
-   * the m_layout and m_expression. */
-  m_layout = Layout();
-  m_expression = Expression();
-}
-
-void ExpressionModel::tidy() {
-  m_layout = Layout();
-  m_expression = Expression();
-}
-
-}