From 88609024447dcf7b25aa163095676cdc3c4ea856 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89milie=20Feral?= <emilie.feral@numworks.com>
Date: Fri, 13 Jan 2017 15:21:39 +0100
Subject: [PATCH] [poincare] Create a class n_context

Change-Id: Icce8f8fe79c07e73587d8c0563e930c1b1e6b308
---
 poincare/Makefile                     |  1 +
 poincare/include/poincare.h           |  1 +
 poincare/include/poincare/n_context.h | 17 +++++++++++++++++
 poincare/include/poincare/x_context.h |  4 ++--
 poincare/src/n_context.cpp            | 24 ++++++++++++++++++++++++
 5 files changed, 45 insertions(+), 2 deletions(-)
 create mode 100644 poincare/include/poincare/n_context.h
 create mode 100644 poincare/src/n_context.cpp

diff --git a/poincare/Makefile b/poincare/Makefile
index 8bee4c7ef..492f7ad16 100644
--- a/poincare/Makefile
+++ b/poincare/Makefile
@@ -23,6 +23,7 @@ objs += $(addprefix poincare/src/,\
   logarithm.o\
   matrix.o\
   matrix_data.o\
+  n_context.o\
   nth_root.o\
   opposite.o\
   parenthesis.o\
diff --git a/poincare/include/poincare.h b/poincare/include/poincare.h
index 9d74b0107..f58ed3da7 100644
--- a/poincare/include/poincare.h
+++ b/poincare/include/poincare.h
@@ -18,6 +18,7 @@
 #include <poincare/logarithm.h>
 #include <poincare/matrix.h>
 #include <poincare/matrix_data.h>
+#include <poincare/n_context.h>
 #include <poincare/nth_root.h>
 #include <poincare/opposite.h>
 #include <poincare/parenthesis.h>
diff --git a/poincare/include/poincare/n_context.h b/poincare/include/poincare/n_context.h
new file mode 100644
index 000000000..d569c4ce1
--- /dev/null
+++ b/poincare/include/poincare/n_context.h
@@ -0,0 +1,17 @@
+#ifndef POINCARE_N_CONTEXT_H
+#define POINCARE_N_CONTEXT_H
+
+#include <poincare/context.h>
+#include <poincare/float.h>
+
+class NContext : public Context {
+public:
+  NContext(Context * parentContext = nullptr);
+  void setExpressionForSymbolName(Expression * expression, const Symbol * symbol) override;
+  const Expression * expressionForSymbol(const Symbol * symbol) override;
+private:
+  Float m_nValue;
+  Context * m_parentContext;
+};
+
+#endif
\ No newline at end of file
diff --git a/poincare/include/poincare/x_context.h b/poincare/include/poincare/x_context.h
index bee9ac94b..0755bf68e 100644
--- a/poincare/include/poincare/x_context.h
+++ b/poincare/include/poincare/x_context.h
@@ -1,5 +1,5 @@
-#ifndef POINCARE_LOCAL_CONTEXT_H
-#define POINCARE_LOCAL_CONTEXT_H
+#ifndef POINCARE_X_CONTEXT_H
+#define POINCARE_X_CONTEXT_H
 
 #include <poincare/context.h>
 #include <poincare/float.h>
diff --git a/poincare/src/n_context.cpp b/poincare/src/n_context.cpp
new file mode 100644
index 000000000..985a60489
--- /dev/null
+++ b/poincare/src/n_context.cpp
@@ -0,0 +1,24 @@
+#include <poincare/n_context.h>
+
+NContext::NContext(::Context * parentContext) :
+  m_nValue(Float(0.0f)),
+  m_parentContext(parentContext)
+{
+}
+
+void NContext::setExpressionForSymbolName(Expression * expression, const Symbol * symbol) {
+  if (symbol->name() == 'n') {
+  	m_nValue = Float((int)expression->approximate(*m_parentContext));
+  } else {
+    m_parentContext->setExpressionForSymbolName(expression, symbol);
+  }
+}
+
+const Expression * NContext::expressionForSymbol(const Symbol * symbol) {
+  if (symbol->name() == 'n') {
+    return &m_nValue;
+  } else {
+    return m_parentContext->expressionForSymbol(symbol);
+  }
+}
+