parser

type Command struct {
	ValCommand   []VarCommand
	IfCommand    []IfCommand
	RangeCommand []RangeCommand
}

type IfCommand struct {
	Expr  string // judgment condition
	Scope int    // affected scope
}

type RangeAction struct {
	Target string // replace the content
	Value  string // current slot value
}

type RangeCommand struct {
	Expr    string // judgment condition
	Scope   int    // affected scope
	Loop    int
	TagId   int // slot tag id
	Counter int
	Action  [][][]RangeAction
}

type VarCommand struct {
	Variable string // variable
	Target   string // replace the content
	Scope    int    // affected scope
}