utils

type DeadInfo struct {
	Reason   string
	Fragment posrange.PositionRange
}

type Join struct {
	On       []string
	Ignoring []string
	Src      Source              // The source we're joining with.
	Op       promParser.ItemType // The binary operation used for this join.
	Depth    int                 // Zero if this is a direct join, non-zero otherwise. sum(foo * bar) would be in-direct join.
}

type LabelPromiseType uint8

type LabelTransform struct {
	Reason   string
	Kind     LabelPromiseType
	Fragment posrange.PositionRange
}

type ReturnInfo struct {
	LogicalExpr    string
	ValuePosition  posrange.PositionRange
	ReturnedNumber float64 // If AlwaysReturns=true this is the number that's returned
	AlwaysReturns  bool    // True if this source always returns results.
	KnownReturn    bool    // True if we always know the return value.
	IsReturnBool   bool    // True if this source uses the 'bool' modifier.
}

type Source struct {
	Labels        map[string]LabelTransform
	DeadInfo      *DeadInfo
	Returns       promParser.ValueType
	Operations    SourceOperations
	Joins         []Join   // Any other sources this source joins with.
	Unless        []Source // Any other sources this source is suppressed by.
	ReturnInfo    ReturnInfo
	Position      posrange.PositionRange
	Type          SourceType
	FixedLabels   bool // Labels are fixed and only allowed labels can be present.
	IsConditional bool // True if this source is guarded by 'foo > 5' or other condition.
}

type SourceOperation struct {
	Node      promParser.Node
	Operation string
}

type SourceOperations []SourceOperation

type SourceType uint8

type Visitor func(s Source, j *Join)