1 files changed, 14 insertions, 0 deletions
diff --git a/subex/subexast.go b/subex/subexast.go
index abf0ca6..3c807ee 100644
--- a/subex/subexast.go
+++ b/subex/subexast.go
@@ -209,3 +209,17 @@ func (ast SubexASTProduct) compileWith(next SubexState) SubexState {
 		}),
 	}
 }
+
+// Runs the content Subex, if all outputted atoms can be cast to numbers, outputs them all negated
+// Rejects if this fails
+type SubexASTNegate struct {
+	content SubexAST
+}
+func (ast SubexASTNegate) compileWith(next SubexState) SubexState {
+	return &SubexCaptureBeginState {
+		next: ast.content.compileWith(&SubexArithmeticEndState {
+			next: next,
+			calculate: negateValues,
+		}),
+	}
+}