[poincare] Override setSign on all Numbers

poincare/include/poincare/decimal.h

@@ -12,7 +12,10 @@ namespace Poincare {
  *  - native_uint_t m_mantissa[] = { 1234 }
  */
 
+class Decimal;
+
 class DecimalNode : public NumberNode {
+  friend class Decimal;
 public:
   DecimalNode() :
     m_negative(false),
@@ -44,6 +47,7 @@ public:
   // Properties
   Type type() const override { return Type::Decimal; }
   Sign sign() const override { return m_negative ? Sign::Negative : Sign::Positive; }
+  Expression setSign(Sign s, Context & context, Preferences::AngleUnit angleUnit) const override;
 
   // Approximation
   Evaluation<float> approximate(SinglePrecision p, Context& context, Preferences::AngleUnit angleUnit) const override {
@@ -71,7 +75,7 @@ private:
   constexpr static int k_maxBufferSize = PrintFloat::k_numberOfStoredSignificantDigits+1+1+1+1+4+1;
   int convertToText(char * buffer, int bufferSize, Preferences::PrintFloatMode mode, int numberOfSignificantDigits) const;
   template<typename T> Evaluation<T> templatedApproximate() const;
-
+  void setNegative(bool negative) { m_negative = negative; }
   bool m_negative;
   int m_exponent;
   size_t m_numberOfDigitsInMantissa;
@@ -96,6 +100,7 @@ private:
   DecimalNode * node() const override { return static_cast<DecimalNode *>(Number::node()); }
   template <typename T> Decimal(T f);
   Decimal(size_t size, Integer m, int e);
+  Expression setSign(ExpressionNode::Sign s, Context & context, Preferences::AngleUnit angleUnit) const;
   // Simplification
   Expression shallowReduce(Context& context, Preferences::AngleUnit angleUnit) const;
   Expression shallowBeautify(Context& context, Preferences::AngleUnit angleUnit) const;

poincare/include/poincare/infinity.h

@@ -13,6 +13,7 @@ public:
   InfinityNode * failedAllocationStaticNode() override { return FailedAllocationStaticNode(); }
 
   void setNegative(bool negative) { m_negative = negative; }
+  Expression setSign(Sign s, Context & context, Preferences::AngleUnit angleUnit) const override;
 
   // TreeNode
   size_t size() const override { return sizeof(InfinityNode); }

poincare/include/poincare/undefined.h

@@ -22,6 +22,7 @@ public:
   // Properties
   Type type() const override { return Type::Undefined; }
   int polynomialDegree(char symbolName) const override;
+  Expression setSign(Sign s, Context & context, Preferences::AngleUnit angleUnit) const override;
 
   // Approximation
   Evaluation<float> approximate(SinglePrecision p, Context& context, Preferences::AngleUnit angleUnit) const override {

poincare/src/decimal.cpp

@@ -44,6 +44,10 @@ size_t DecimalNode::size() const {
   return sizeof(DecimalNode)+ sizeof(native_uint_t)*m_numberOfDigitsInMantissa;
 }
 
+Expression DecimalNode::setSign(Sign s, Context & context, Preferences::AngleUnit angleUnit) const {
+  return Decimal(this).setSign(s, context, angleUnit);
+}
+
 int DecimalNode::simplificationOrderSameType(const ExpressionNode * e, bool canBeInterrupted) const {
   assert(e->type() == Type::Decimal);
   const DecimalNode * other = static_cast<const DecimalNode *>(e);
@@ -273,6 +277,12 @@ Decimal::Decimal(size_t size, Integer m, int e) : Number(TreePool::sharedPool()-
   node()->setValue(m.node()->digits(), m.node()->numberOfDigits(), e, m.isNegative());
 }
 
+Expression Decimal::setSign(ExpressionNode::Sign s, Context & context, Preferences::AngleUnit angleUnit) const {
+  Decimal result = *this;
+  result.node()->setNegative(s == ExpressionNode::Sign::Negative);
+  return result;
+}
+
 Expression Decimal::shallowReduce(Context& context, Preferences::AngleUnit angleUnit) const {
   Expression e = Expression::defaultShallowReduce(context, angleUnit);
   if (e.isUndefinedOrAllocationFailure()) {

poincare/src/infinity.cpp

@@ -16,6 +16,10 @@ InfinityNode * InfinityNode::FailedAllocationStaticNode() {
   return &failure;
 }
 
+Expression InfinityNode::setSign(Sign s, Context & context, Preferences::AngleUnit angleUnit) const {
+  return Infinity(s == Sign::Negative);
+}
+
 LayoutRef InfinityNode::createLayout(Preferences::PrintFloatMode floatDisplayMode, int numberOfSignificantDigits) const {
   char buffer[5];
   int numberOfChars = serialize(buffer, 5, floatDisplayMode, numberOfSignificantDigits);

poincare/src/undefined.cpp

@@ -19,6 +19,10 @@ int UndefinedNode::polynomialDegree(char symbolName) const {
   return -1;
 }
 
+Expression UndefinedNode::setSign(Sign s, Context & context, Preferences::AngleUnit angleUnit) const {
+  return Undefined();
+}
+
 LayoutRef UndefinedNode::createLayout(Preferences::PrintFloatMode floatDisplayMode, int numberOfSignificantDigits) const {
   char buffer[6];
   int numberOfChars = PrintFloat::convertFloatToText<float>(NAN, buffer, 6, numberOfSignificantDigits, floatDisplayMode);