treewide: comply with the OpenBMC style guidelines
The guidelines say cpp source code filenames should be lower_snake_case:
https://github.com/openbmc/docs/blob/master/cpp-style-and-conventions.md#files
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
Change-Id: Ia04017b0eb9a65ce1303af5b6dc36e730410fd91
diff --git a/src/expression.cpp b/src/expression.cpp
new file mode 100644
index 0000000..50fcbe3
--- /dev/null
+++ b/src/expression.cpp
@@ -0,0 +1,117 @@
+/*
+// Copyright (c) 2017 Intel Corporation
+// Copyright (c) 2022 IBM Corp.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+*/
+
+#include "expression.hpp"
+
+#include <iostream>
+#include <stdexcept>
+
+namespace expression
+{
+std::optional<Operation> parseOperation(std::string& op)
+{
+ if (op == "+")
+ {
+ return Operation::addition;
+ }
+ if (op == "-")
+ {
+ return Operation::subtraction;
+ }
+ if (op == "*")
+ {
+ return Operation::multiplication;
+ }
+ if (op == R"(%)")
+ {
+ return Operation::modulo;
+ }
+ if (op == R"(/)")
+ {
+ return Operation::division;
+ }
+
+ return std::nullopt;
+}
+
+int evaluate(int a, Operation op, int b)
+{
+ switch (op)
+ {
+ case Operation::addition:
+ {
+ return a + b;
+ }
+ case Operation::subtraction:
+ {
+ return a - b;
+ }
+ case Operation::multiplication:
+ {
+ return a * b;
+ }
+ case Operation::division:
+ {
+ return a / b;
+ }
+ case Operation::modulo:
+ {
+ return a % b;
+ }
+
+ default:
+ throw std::invalid_argument("Unrecognised operation");
+ }
+}
+
+int evaluate(int substitute, std::vector<std::string>::iterator curr,
+ std::vector<std::string>::iterator& end)
+{
+ bool isOperator = true;
+ std::optional<Operation> next = Operation::addition;
+
+ for (; curr != end; curr++)
+ {
+ if (isOperator)
+ {
+ next = expression::parseOperation(*curr);
+ if (!next)
+ {
+ break;
+ }
+ }
+ else
+ {
+ try
+ {
+ int constant = std::stoi(*curr);
+ substitute = evaluate(substitute, *next, constant);
+ }
+ catch (const std::invalid_argument&)
+ {
+ std::cerr << "Parameter not supported for templates " << *curr
+ << "\n";
+ continue;
+ }
+ }
+ isOperator = !isOperator;
+ }
+
+ end = curr;
+ return substitute;
+}
+} // namespace expression