1 files changed, 58 insertions, 0 deletions
diff --git a/gopls/internal/lsp/analysis/embeddirective/embeddirective.go b/gopls/internal/lsp/analysis/embeddirective/embeddirective.go
new file mode 100644
index 000000000..1b504f7cb
--- /dev/null
+++ b/gopls/internal/lsp/analysis/embeddirective/embeddirective.go
@@ -0,0 +1,58 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package embeddirective defines an Analyzer that validates import for //go:embed directive.
+package embeddirective
+
+import (
+	"go/ast"
+	"strings"
+
+	"golang.org/x/tools/go/analysis"
+)
+
+const Doc = `check for //go:embed directive import
+
+This analyzer checks that the embed package is imported when source code contains //go:embed comment directives.
+The embed package must be imported for //go:embed directives to function.import _ "embed".`
+
+var Analyzer = &analysis.Analyzer{
+	Name:             "embed",
+	Doc:              Doc,
+	Requires:         []*analysis.Analyzer{},
+	Run:              run,
+	RunDespiteErrors: true,
+}
+
+func run(pass *analysis.Pass) (interface{}, error) {
+	for _, f := range pass.Files {
+		com := hasEmbedDirectiveComment(f)
+		if com != nil {
+			assertEmbedImport(pass, com, f)
+		}
+	}
+	return nil, nil
+}
+
+// Check if the comment contains //go:embed directive.
+func hasEmbedDirectiveComment(f *ast.File) *ast.Comment {
+	for _, cg := range f.Comments {
+		for _, c := range cg.List {
+			if strings.HasPrefix(c.Text, "//go:embed ") {
+				return c
+			}
+		}
+	}
+	return nil
+}
+
+// Verifies that "embed" import exists for //go:embed directive.
+func assertEmbedImport(pass *analysis.Pass, com *ast.Comment, f *ast.File) {
+	for _, imp := range f.Imports {
+		if "\"embed\"" == imp.Path.Value {
+			return
+		}
+	}
+	pass.Report(analysis.Diagnostic{Pos: com.Pos(), End: com.Pos() + 10, Message: "The \"embed\" package must be imported when using go:embed directives."})
+}