Giant blob of minor changes

[dotfiles/.git] / .config / coc / extensions / coc-go-data / tools / pkg / mod / golang.org / x / tools@v0.0.0-20201105173854-bc9fc8d8c4bc / go / analysis / passes / nilfunc / nilfunc.go

diff --git a/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201105173854-bc9fc8d8c4bc/go/analysis/passes/nilfunc/nilfunc.go b/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201105173854-bc9fc8d8c4bc/go/analysis/passes/nilfunc/nilfunc.go
new file mode 100644 (file)
index 0000000..cd42c98
--- /dev/null
+++ b/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201105173854-bc9fc8d8c4bc/go/analysis/passes/nilfunc/nilfunc.go
@@ -0,0 +1,74 @@
+// Copyright 2013 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 nilfunc defines an Analyzer that checks for useless
+// comparisons against nil.
+package nilfunc
+
+import (
+       "go/ast"
+       "go/token"
+       "go/types"
+
+       "golang.org/x/tools/go/analysis"
+       "golang.org/x/tools/go/analysis/passes/inspect"
+       "golang.org/x/tools/go/ast/inspector"
+)
+
+const Doc = `check for useless comparisons between functions and nil
+
+A useless comparison is one like f == nil as opposed to f() == nil.`
+
+var Analyzer = &analysis.Analyzer{
+       Name:     "nilfunc",
+       Doc:      Doc,
+       Requires: []*analysis.Analyzer{inspect.Analyzer},
+       Run:      run,
+}
+
+func run(pass *analysis.Pass) (interface{}, error) {
+       inspect := pass.ResultOf[inspect.Analyzer].(*inspector.Inspector)
+
+       nodeFilter := []ast.Node{
+               (*ast.BinaryExpr)(nil),
+       }
+       inspect.Preorder(nodeFilter, func(n ast.Node) {
+               e := n.(*ast.BinaryExpr)
+
+               // Only want == or != comparisons.
+               if e.Op != token.EQL && e.Op != token.NEQ {
+                       return
+               }
+
+               // Only want comparisons with a nil identifier on one side.
+               var e2 ast.Expr
+               switch {
+               case pass.TypesInfo.Types[e.X].IsNil():
+                       e2 = e.Y
+               case pass.TypesInfo.Types[e.Y].IsNil():
+                       e2 = e.X
+               default:
+                       return
+               }
+
+               // Only want identifiers or selector expressions.
+               var obj types.Object
+               switch v := e2.(type) {
+               case *ast.Ident:
+                       obj = pass.TypesInfo.Uses[v]
+               case *ast.SelectorExpr:
+                       obj = pass.TypesInfo.Uses[v.Sel]
+               default:
+                       return
+               }
+
+               // Only want functions.
+               if _, ok := obj.(*types.Func); !ok {
+                       return
+               }
+
+               pass.ReportRangef(e, "comparison of function %v %v nil is always %v", obj.Name(), e.Op, e.Op == token.NEQ)
+       })
+       return nil, nil
+}