Giant blob of minor changes

[dotfiles/.git] / .config / coc / extensions / coc-go-data / tools / pkg / mod / golang.org / x / tools@v0.0.0-20201028153306-37f0764111ff / internal / lsp / analysis / nonewvars / nonewvars.go

diff --git a/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201028153306-37f0764111ff/internal/lsp/analysis/nonewvars/nonewvars.go b/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201028153306-37f0764111ff/internal/lsp/analysis/nonewvars/nonewvars.go
new file mode 100644 (file)
index 0000000..e7fa430
--- /dev/null
+++ b/.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201028153306-37f0764111ff/internal/lsp/analysis/nonewvars/nonewvars.go
@@ -0,0 +1,93 @@
+// Copyright 2020 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 nonewvars defines an Analyzer that applies suggested fixes
+// to errors of the type "no new variables on left side of :=".
+package nonewvars
+
+import (
+       "bytes"
+       "go/ast"
+       "go/format"
+       "go/token"
+
+       "golang.org/x/tools/go/analysis"
+       "golang.org/x/tools/go/analysis/passes/inspect"
+       "golang.org/x/tools/go/ast/inspector"
+       "golang.org/x/tools/internal/analysisinternal"
+)
+
+const Doc = `suggested fixes for "no new vars on left side of :="
+
+This checker provides suggested fixes for type errors of the
+type "no new vars on left side of :=". For example:
+       z := 1
+       z := 2
+will turn into
+       z := 1
+       z = 2
+`
+
+var Analyzer = &analysis.Analyzer{
+       Name:             string(analysisinternal.NoNewVars),
+       Doc:              Doc,
+       Requires:         []*analysis.Analyzer{inspect.Analyzer},
+       Run:              run,
+       RunDespiteErrors: true,
+}
+
+func run(pass *analysis.Pass) (interface{}, error) {
+       inspect := pass.ResultOf[inspect.Analyzer].(*inspector.Inspector)
+       errors := analysisinternal.GetTypeErrors(pass)
+
+       nodeFilter := []ast.Node{(*ast.AssignStmt)(nil)}
+       inspect.Preorder(nodeFilter, func(n ast.Node) {
+               assignStmt, _ := n.(*ast.AssignStmt)
+               // We only care about ":=".
+               if assignStmt.Tok != token.DEFINE {
+                       return
+               }
+
+               var file *ast.File
+               for _, f := range pass.Files {
+                       if f.Pos() <= assignStmt.Pos() && assignStmt.Pos() < f.End() {
+                               file = f
+                               break
+                       }
+               }
+               if file == nil {
+                       return
+               }
+
+               for _, err := range errors {
+                       if !FixesError(err.Msg) {
+                               continue
+                       }
+                       if assignStmt.Pos() > err.Pos || err.Pos >= assignStmt.End() {
+                               continue
+                       }
+                       var buf bytes.Buffer
+                       if err := format.Node(&buf, pass.Fset, file); err != nil {
+                               continue
+                       }
+                       pass.Report(analysis.Diagnostic{
+                               Pos:     err.Pos,
+                               End:     analysisinternal.TypeErrorEndPos(pass.Fset, buf.Bytes(), err.Pos),
+                               Message: err.Msg,
+                               SuggestedFixes: []analysis.SuggestedFix{{
+                                       Message: "Change ':=' to '='",
+                                       TextEdits: []analysis.TextEdit{{
+                                               Pos: err.Pos,
+                                               End: err.Pos + 1,
+                                       }},
+                               }},
+                       })
+               }
+       })
+       return nil, nil
+}
+
+func FixesError(msg string) bool {
+       return msg == "no new variables on left side of :="
+}