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package parse
import "src.elv.sh/pkg/diag"
// Node represents a parse tree as well as an AST.
type Node interface {
diag.Ranger
parse(*parser)
n() *node
}
type node struct {
diag.Ranging
sourceText string
parent Node
children []Node
}
func (n *node) n() *node { return n }
func (n *node) addChild(ch Node) { n.children = append(n.children, ch) }
// Range returns the range within the full source text that parses to the node.
func (n *node) Range() diag.Ranging { return n.Ranging }
// Parent returns the parent of a node. It returns nil if the node is the root
// of the parse tree.
func Parent(n Node) Node { return n.n().parent }
// SourceText returns the part of the source text that parses to the node.
func SourceText(n Node) string { return n.n().sourceText }
// Children returns all children of the node in the parse tree.
func Children(n Node) []Node { return n.n().children }
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