Adjusts the sum operator to act as boolean OR when all inputs are booleans

1 files changed, 15 insertions, 5 deletions

diff --git a/subex/subexstate.go b/subex/subexstate.go
index dbc8340..0a4f1bb 100644
--- a/subex/subexstate.go
+++ b/subex/subexstate.go
@@ -174,33 +174,43 @@ func (state SubexRangeState) accepting(store Store, outputStack OutputStack) []O
 	return nil
 }
 
-func sumValues(atoms []walk.Atom) (walk.ValueNumber, error) {
+func sumValues(atoms []walk.Atom) (walk.WalkValue, error) {
+	allBools := true
 	var sum float64 = 0
+	var any bool = false
 	values, err := walk.MemoryCompound(atoms)
 	if err != nil {
-		return 0, err
+		return walk.ValueNull{}, err
 	}
 	for _, value := range values {
 		switch v := value.(type) {
 			case walk.ValueNull:
+				allBools = false
 			case walk.ValueBool:
 				if (bool(v)) {
 					sum += 1
+					any = true
 				}
 			case walk.ValueNumber:
+				allBools = false
 				sum += float64(v)
 			case walk.ValueString:
+				allBools = false
 				num, err := strconv.ParseFloat(string(v), 64)
 				if err == nil {
 					sum += num
 				} else {
-					return 0, errors.New("Tried to sum non-castable string")
+					return walk.ValueNull{}, errors.New("Tried to sum non-castable string")
 				}
 			default:
-				return 0, errors.New("Tried to sum non-number")
+				return walk.ValueNull{}, errors.New("Tried to sum non-number")
 		}
 	}
-	return walk.ValueNumber(sum), nil
+	if allBools {
+		return walk.ValueBool(any), nil
+	} else {
+		return walk.ValueNumber(sum), nil
+	}
 }
 
 // At the start of a sum, just pushes to the OutputStack allowing the end to capture what was output in the middle