From c7d7f10bdff703e4a3c0414e8a33d4e45c91eb35 Mon Sep 17 00:00:00 2001
From: Dmitry Vyukov <dvyukov@google.com>
Date: Sat, 4 Jul 2020 11:12:55 +0200
Subject: go.mod: vendor golangci-lint

---
 vendor/github.com/Djarvur/go-err113/comparison.go | 103 ++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 vendor/github.com/Djarvur/go-err113/comparison.go

(limited to 'vendor/github.com/Djarvur/go-err113/comparison.go')

diff --git a/vendor/github.com/Djarvur/go-err113/comparison.go b/vendor/github.com/Djarvur/go-err113/comparison.go
new file mode 100644
index 000000000..7e7777df6
--- /dev/null
+++ b/vendor/github.com/Djarvur/go-err113/comparison.go
@@ -0,0 +1,103 @@
+package err113
+
+import (
+	"fmt"
+	"go/ast"
+	"go/token"
+	"go/types"
+
+	"golang.org/x/tools/go/analysis"
+)
+
+func inspectComparision(pass *analysis.Pass, n ast.Node) bool { // nolint: unparam
+	// check whether the call expression matches time.Now().Sub()
+	be, ok := n.(*ast.BinaryExpr)
+	if !ok {
+		return true
+	}
+
+	// check if it is a comparison operation
+	if be.Op != token.EQL && be.Op != token.NEQ {
+		return true
+	}
+
+	// check that both left and right hand side are not nil
+	if pass.TypesInfo.Types[be.X].IsNil() || pass.TypesInfo.Types[be.Y].IsNil() {
+		return true
+	}
+
+	// check that both left and right hand side are not io.EOF
+	if isEOF(be.X, pass.TypesInfo) || isEOF(be.Y, pass.TypesInfo) {
+		return true
+	}
+
+	// check that both left and right hand side are errors
+	if !isError(be.X, pass.TypesInfo) && !isError(be.Y, pass.TypesInfo) {
+		return true
+	}
+
+	oldExpr := render(pass.Fset, be)
+
+	negate := ""
+	if be.Op == token.NEQ {
+		negate = "!"
+	}
+
+	newExpr := fmt.Sprintf("%s%s.Is(%s, %s)", negate, "errors", be.X, be.Y)
+
+	pass.Report(
+		analysis.Diagnostic{
+			Pos:     be.Pos(),
+			Message: fmt.Sprintf("do not compare errors directly, use errors.Is() instead: %q", oldExpr),
+			SuggestedFixes: []analysis.SuggestedFix{
+				{
+					Message: fmt.Sprintf("should replace %q with %q", oldExpr, newExpr),
+					TextEdits: []analysis.TextEdit{
+						{
+							Pos:     be.Pos(),
+							End:     be.End(),
+							NewText: []byte(newExpr),
+						},
+					},
+				},
+			},
+		},
+	)
+
+	return true
+}
+
+func isError(v ast.Expr, info *types.Info) bool {
+	if intf, ok := info.TypeOf(v).Underlying().(*types.Interface); ok {
+		return intf.NumMethods() == 1 && intf.Method(0).FullName() == "(error).Error"
+	}
+
+	return false
+}
+
+func isEOF(ex ast.Expr, info *types.Info) bool {
+	se, ok := ex.(*ast.SelectorExpr)
+	if !ok || se.Sel.Name != "EOF" {
+		return false
+	}
+
+	if ep, ok := asImportedName(se.X, info); !ok || ep != "io" {
+		return false
+	}
+
+	return true
+}
+
+func asImportedName(ex ast.Expr, info *types.Info) (string, bool) {
+	ei, ok := ex.(*ast.Ident)
+	if !ok {
+		return "", false
+	}
+
+	ep, ok := info.ObjectOf(ei).(*types.PkgName)
+	if !ok {
+		return "", false
+	}
+
+	return ep.Imported().Name(), true
+}
-- 
cgit mrf-deployment