From 3951f8c09b3f49253cf0d354df708069223d0316 Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Sun, 23 Jul 2023 12:24:32 -0230
Subject: constant and function parsing skeleton

---
 func.go | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 func.go

(limited to 'func.go')

diff --git a/func.go b/func.go
new file mode 100644
index 0000000..914cb61
--- /dev/null
+++ b/func.go
@@ -0,0 +1,18 @@
+package main
+
+import "math"
+
+// parseFunction returns nil is s is not a valid function.
+func parseFunction(s string) func(Stack) {
+	switch s {
+	case "sin":
+		return sin
+	}
+	return nil
+}
+
+func sin(stack Stack) {
+	if len(stack) > 0 {
+		stack[len(stack)-1] = math.Sin(stack[len(stack)-1])
+	}
+}
-- 
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