Implement number evaluation

lib/evaluator.c

@@ -0,0 +1,8 @@
+#include "evaluator.h"
+
+int evaluate(const expression_t *expression)
+{
+	if (expression->is_number)
+		return expression->number;
+	return 0;
+}

lib/include/evaluator.h

@@ -0,0 +1,8 @@
+#ifndef EVALUATOR_H
+#define EVALUATOR_H
+
+#include "expression.h"
+
+int evaluate(const expression_t *expression);
+
+#endif

scripts/build.sh

@@ -7,12 +7,16 @@ CFLAGS="$CFLAGS -Ilib/include"
 mkdir -p build
 
 # Build library
+clang $CFLAGS -c -o build/evaluator.o lib/evaluator.c
 clang $CFLAGS -c -o build/memory_pool.o lib/memory_pool.c
 clang $CFLAGS -c -o build/reader.o lib/reader.c
-ar -crs build/lib.a build/memory_pool.o build/reader.o
+ar -crs build/lib.a build/evaluator.o build/memory_pool.o build/reader.o
 
 # Build tests
 clang $CFLAGS -Itests -c -o build/testing.o tests/testing.c
+clang $CFLAGS -Itests -c -o build/evaluator_tests.o tests/evaluator_tests.c
+clang $CFLAGS -o build/evaluator_tests \
+	  build/evaluator_tests.o build/lib.a build/testing.o
 clang $CFLAGS -Itests -c -o build/reader_tests.o tests/reader_tests.c
 clang $CFLAGS -o build/reader_tests \
 	  build/reader_tests.o build/lib.a build/testing.o

scripts/test.sh

@@ -1,2 +1,3 @@
 cd "$(git rev-parse --show-toplevel)"
+echo ":: Evaluator tests ::" && build/evaluator_tests
 echo ":: Reader tests ::" && build/reader_tests

tests/evaluator_tests.c

@@ -0,0 +1,33 @@
+#include "evaluator.h"
+#include "memory_pool.h"
+#include "testing.h"
+
+static memory_pool_t pool;
+
+static void number_1234_is_evaluated_as_1234(void)
+{
+	init_memory_pool(&pool);
+	expression_t *expression = allocate_expression(&pool);
+	expression->is_number = true;
+	expression->number = 1234;
+	const int result = evaluate(expression);
+	ASSERT_EQUAL(1234, result);
+}
+
+static void number_4321_is_evaluated_as_4321(void)
+{
+	init_memory_pool(&pool);
+	expression_t *expression = allocate_expression(&pool);
+	expression->is_number = true;
+	expression->number = 4321;
+	const int result = evaluate(expression);
+	ASSERT_EQUAL(4321, result);
+}
+
+int main(void)
+{
+	TESTING_BEGIN();
+	RUN_TEST(number_1234_is_evaluated_as_1234);
+	RUN_TEST(number_4321_is_evaluated_as_4321);
+	TESTING_END();
+}