merge backend refactoring from main

1 files changed, 28 insertions, 0 deletions

diff --git a/mass.go b/mass.go
new file mode 100644
index 0000000..158bc37
--- /dev/null
+++ b/mass.go
@@ -0,0 +1,28 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+)
+
+type MassFlowRate float32
+
+const (
+	KilogramsPerSecond MassFlowRate = 1
+	PoundsPerMinute    MassFlowRate = 0.007_559_872_833
+)
+
+var MassFlowRateUnits = []string{"kg/s", "lb/min"}
+
+func ParseMassFlowRateUnit(s string) (MassFlowRate, error) {
+	// Each case corresponds to a value in MassFlowRateUnits.
+	switch s {
+	case "kg/s":
+		return KilogramsPerSecond, nil
+	case "lb/min":
+		return PoundsPerMinute, nil
+	default:
+		return *new(MassFlowRate), errors.New(
+			fmt.Sprintf("invalid mass flow rate unit: '%s'", s))
+	}
+}