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// Package parseutil contains utilities built on top of the parse package.
package parseutil
import (
"strings"
"github.com/elves/elvish/pkg/parse"
)
// LeafNodeAtDot finds the leaf node at a specific position. It returns nil if
// position is out of bound.
func FindLeafNode(n parse.Node, p int) parse.Node {
descend:
for len(n.Children()) > 0 {
for _, ch := range n.Children() {
if ch.Range().From <= p && p <= ch.Range().To {
n = ch
continue descend
}
}
return nil
}
return n
}
// Wordify turns a piece of source code into words.
func Wordify(src string) []string {
n, _ := parse.AsChunk("[wordify]", src)
return wordifyInner(n, nil)
}
func wordifyInner(n parse.Node, words []string) []string {
if len(n.Children()) == 0 || isCompound(n) {
text := n.SourceText()
if strings.TrimFunc(text, parse.IsWhitespace) != "" {
return append(words, text)
}
return words
}
for _, ch := range n.Children() {
words = wordifyInner(ch, words)
}
return words
}
func isCompound(n parse.Node) bool {
_, ok := n.(*parse.Compound)
return ok
}
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