1 files changed, 23 insertions, 0 deletions
diff --git a/subex/subexstate.go b/subex/subexstate.go
index 3bcbdee..bf5bab9 100644
--- a/subex/subexstate.go
+++ b/subex/subexstate.go
@@ -104,6 +104,29 @@ func (state SubexCopyNumberState) accepting(aux auxiliaryState) []OutputStack {
 	return nil
 }
 
+type SubexNumberMappingState struct {
+	Range NumberExpr
+	Replace []NumberExpr
+	next SubexState
+}
+func (state SubexNumberMappingState) eat(aux auxiliaryState, edible walk.Edible) []SubexBranch {
+	number, isNumber := edible.(walk.NumberValue)
+	if !isNumber || state.Range.Eval(float64(number)) == 0.0 {
+		return nil
+	}
+	var res []walk.Value
+	for _, expr := range state.Replace {
+		res = append(res, walk.NumberValue(expr.Eval(float64(number))))
+	}
+	return []SubexBranch {{
+		state: state.next,
+		aux: aux.topAppend(res),
+	}}
+}
+func (state SubexNumberMappingState) accepting(aux auxiliaryState) []OutputStack {
+	return nil
+}
+
 // Just pushes to the OutputStack and hands over to the next state
 // Used to capture the output of the state being handed over to
 type SubexCaptureBeginState struct {