LSP-server-example

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// Copyright 2023 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package protocol
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import (
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	"path/filepath"
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	"strings"
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)
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// InDir checks whether path is in the file tree rooted at dir.
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// It checks only the lexical form of the file names.
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// It does not consider symbolic links.
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//
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// Copied from go/src/cmd/go/internal/search/search.go.
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func InDir(dir, path string) bool {
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	pv := strings.ToUpper(filepath.VolumeName(path))
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	dv := strings.ToUpper(filepath.VolumeName(dir))
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	path = path[len(pv):]
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	dir = dir[len(dv):]
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	switch {
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	default:
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		return false
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	case pv != dv:
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		return false
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	case len(path) == len(dir):
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		if path == dir {
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			return true
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		}
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		return false
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	case dir == "":
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		return path != ""
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	case len(path) > len(dir):
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		if dir[len(dir)-1] == filepath.Separator {
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			if path[:len(dir)] == dir {
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				return path[len(dir):] != ""
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			}
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			return false
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		}
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		if path[len(dir)] == filepath.Separator && path[:len(dir)] == dir {
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			if len(path) == len(dir)+1 {
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				return true
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			}
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			return path[len(dir)+1:] != ""
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		}
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		return false
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	}
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}
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