Add merge command

1 files changed, 34 insertions, 0 deletions

diff --git a/main/command.go b/main/command.go
index 3f22821..6d75974 100644
--- a/main/command.go
+++ b/main/command.go
@@ -44,13 +44,47 @@ func (cmd AppendNextCommand) exec(state *ProgramState) {
 	if err != nil {
 		panic("Missing next value")
 	}
+
+	state.prevStart = nextItem.PrevStart
+	state.start = nextItem.Start
+	state.end = nextItem.End
+	state.nextEnd = nextItem.NextEnd
+
 	state.value = append(state.value, nextItem.Value)
+
 	state.pc++
 }
 func (cmd AppendNextCommand) String() string {
 	return "N"
 }
 
+type MergeCommand struct {}
+func (cmd MergeCommand) exec(state *ProgramState) {
+	nextItem, err := state.in.Read()
+	if err != nil {
+		panic("Missing next value")
+	}
+
+	state.prevStart = nextItem.PrevStart
+	state.start = nextItem.Start
+	state.end = nextItem.End
+	state.nextEnd = nextItem.NextEnd
+
+	if len(state.value) == 0 {
+		state.value = []walk.Value {nextItem.Value}
+	} else {
+		state.value = append(
+			state.value[:len(state.value) - 1],
+			walk.Merge(state.value[len(state.value) - 1], nextItem.Value)...
+		)
+	}
+
+	state.pc++
+}
+func (cmd MergeCommand) String() string {
+	return "m"
+}
+
 type DeleteValueCommand struct {}
 func (cmd DeleteValueCommand) exec(state *ProgramState) {
 	state.value = nil