Adds the sum operator

Currently doesn't parse strings as each atom is considered independantly. Instead individual characters in strings can be cast

1 files changed, 12 insertions, 0 deletions

diff --git a/subex/subexast.go b/subex/subexast.go
index 5e63f03..9e7067b 100644
--- a/subex/subexast.go
+++ b/subex/subexast.go
@@ -181,3 +181,15 @@ func (ast SubexASTRange) compileWith(next SubexState) SubexState {
 		next: next,
 	}
 }
+
+// Run content and then assume that output is a series of numbers, sum them and output the total
+// Will cast strings, booleans and null to numbers
+type SubexASTSum struct {
+	content SubexAST
+}
+func (ast SubexASTSum) compileWith(next SubexState) SubexState {
+	return &SubexSumState {
+		inputState: ast.content.compileWith(&SubexNoneState{}),
+		next: next,
+	}
+}