Poincare: Add a LeafExpression class

Parent of Symbol, Integer, Float

Change-Id: I866ec888b007ea8e486f5627039f934bddcc9ace

poincare/Makefile

@@ -1,17 +1,19 @@
 SFLAGS += -Ipoincare/include
 objs += $(addprefix poincare/src/,\
   addition.o\
+  binary_operation.o\
   commutative_operation.o\
   context.o\
   expression.o\
-  float.o\
-  integer.o\
-  fraction.o\
   expression_lexer.o\
   expression_parser.o\
-  subtraction.o\
+  float.o\
+  fraction.o\
+  integer.o\
+  leaf_expression.o\
   power.o\
   product.o\
+  subtraction.o\
   symbol.o\
 )
 objs += $(addprefix poincare/src/layout/,\
@@ -31,6 +33,7 @@ tests += $(addprefix poincare/test/,\
   integer.cpp\
   product.cpp\
   simplify.cpp\
+  simplify_addition_integer.cpp\
   subtraction.cpp\
 )
 

poincare/include/poincare/float.h

@@ -1,9 +1,9 @@
 #ifndef POINCARE_FLOAT_H
 #define POINCARE_FLOAT_H
 
-#include <poincare/expression.h>
+#include <poincare/leaf_expression.h>
 
-class Float : public Expression {
+class Float : public LeafExpression {
   public:
     Float(float f);
     ~Float();

poincare/include/poincare/integer.h

@@ -1,14 +1,14 @@
 #ifndef POINCARE_INTEGER_H
 #define POINCARE_INTEGER_H
 
-#include <poincare/expression.h>
+#include <poincare/leaf_expression.h>
 #include <stdint.h>
 
 typedef int32_t native_int_t;
 typedef uint32_t native_uint_t;
 typedef uint64_t double_native_uint_t;
 
-class Integer : public Expression {
+class Integer : public LeafExpression {
   public:
     Integer(native_int_t i);
     Integer(Integer&& other); // C++11 move constructor

poincare/include/poincare/symbol.h

@@ -1,9 +1,9 @@
 #ifndef POINCARE_SYMBOL_H
 #define POINCARE_SYMBOL_H
 
-#include <poincare/expression.h>
+#include <poincare/leaf_expression.h>
 
-class Symbol : public Expression {
+class Symbol : public LeafExpression {
   public:
     Symbol(char * name);
     ~Symbol();

poincare/src/leaf_expression.cpp

@@ -0,0 +1,14 @@
+#include <poincare/leaf_expression.h>
+extern "C" {
+#include <assert.h>
+#include <stdlib.h>
+}
+
+int LeafExpression::numberOfOperands() {
+  return 0;
+}
+
+Expression * LeafExpression::operand(int i) {
+  assert(false);
+  return nullptr;
+}