Function findDirective

internal/extgen/astutil.go:14–24

findDirective searches a comment group for a line matching re and returns the first capture group (typically the directive payload) along with the comment's source line number. Returns "" when no comment matches.

(group *ast.CommentGroup, fset *token.FileSet, re *regexp.Regexp)

// first capture group (typically the directive payload) along with the comment's
// source line number. Returns "" when no comment matches.
func findDirective(group *ast.CommentGroup, fset *token.FileSet, re *regexp.Regexp) (string, int) {
	if group == nil {
		return "", 0
	}
	for _, comment := range group.List {
		if matches := re.FindStringSubmatch(comment.Text); matches != nil {
			return strings.TrimSpace(matches[1]), fset.Position(comment.Pos()).Line
		}
	}
	return "", 0
}

// extractNodeSource returns the verbatim source text covered by node in src.
func extractNodeSource(src []byte, fset *token.FileSet, node ast.Node) string {