Combines sum and product into an arithmetic state that contains a function for it's operation

Creates arithmetic.go which will house all of these functions

1 files changed, 4 insertions, 2 deletions

diff --git a/subex/subexast.go b/subex/subexast.go
index 431ea26..abf0ca6 100644
--- a/subex/subexast.go
+++ b/subex/subexast.go
@@ -190,8 +190,9 @@ type SubexASTSum struct {
 }
 func (ast SubexASTSum) compileWith(next SubexState) SubexState {
 	return &SubexCaptureBeginState {
-		next: ast.content.compileWith(&SubexSumEndState {
+		next: ast.content.compileWith(&SubexArithmeticEndState {
 			next: next,
+			calculate: sumValues,
 		}),
 	}
 }
@@ -202,8 +203,9 @@ type SubexASTProduct struct {
 }
 func (ast SubexASTProduct) compileWith(next SubexState) SubexState {
 	return &SubexCaptureBeginState {
-		next: ast.content.compileWith(&SubexProductEndState {
+		next: ast.content.compileWith(&SubexArithmeticEndState {
 			next: next,
+			calculate: multiplyValues,
 		}),
 	}
 }