1 files changed, 90 insertions, 0 deletions
diff --git a/vendor/github.com/Djarvur/go-err113/err113.go b/vendor/github.com/Djarvur/go-err113/err113.go
new file mode 100644
index 000000000..e9d93a7a0
--- /dev/null
+++ b/vendor/github.com/Djarvur/go-err113/err113.go
@@ -0,0 +1,90 @@
+// Package err113 is a Golang linter to check the errors handling expressions
+package err113
+
+import (
+	"bytes"
+	"go/ast"
+	"go/printer"
+	"go/token"
+
+	"golang.org/x/tools/go/analysis"
+)
+
+// NewAnalyzer creates a new analysis.Analyzer instance tuned to run err113 checks
+func NewAnalyzer() *analysis.Analyzer {
+	return &analysis.Analyzer{
+		Name: "err113",
+		Doc:  "checks the error handling rules according to the Go 1.13 new error type",
+		Run:  run,
+	}
+}
+
+func run(pass *analysis.Pass) (interface{}, error) {
+	for _, file := range pass.Files {
+		tlds := enumerateFileDecls(file)
+
+		ast.Inspect(
+			file,
+			func(n ast.Node) bool {
+				return inspectComparision(pass, n) &&
+					inspectDefinition(pass, tlds, n)
+			},
+		)
+	}
+
+	return nil, nil
+}
+
+// render returns the pretty-print of the given node
+func render(fset *token.FileSet, x interface{}) string {
+	var buf bytes.Buffer
+	if err := printer.Fprint(&buf, fset, x); err != nil {
+		panic(err)
+	}
+
+	return buf.String()
+}
+
+func enumerateFileDecls(f *ast.File) map[*ast.CallExpr]struct{} {
+	res := make(map[*ast.CallExpr]struct{})
+
+	var ces []*ast.CallExpr // nolint: prealloc
+
+	for _, d := range f.Decls {
+		ces = append(ces, enumerateDeclVars(d)...)
+	}
+
+	for _, ce := range ces {
+		res[ce] = struct{}{}
+	}
+
+	return res
+}
+
+func enumerateDeclVars(d ast.Decl) (res []*ast.CallExpr) {
+	td, ok := d.(*ast.GenDecl)
+	if !ok || td.Tok != token.VAR {
+		return nil
+	}
+
+	for _, s := range td.Specs {
+		res = append(res, enumerateSpecValues(s)...)
+	}
+
+	return res
+}
+
+func enumerateSpecValues(s ast.Spec) (res []*ast.CallExpr) {
+	vs, ok := s.(*ast.ValueSpec)
+	if !ok {
+		return nil
+	}
+
+	for _, v := range vs.Values {
+		if ce, ok := v.(*ast.CallExpr); ok {
+			res = append(res, ce)
+		}
+	}
+
+	return res
+}