84 lines
2.0 KiB
Go
84 lines
2.0 KiB
Go
// Copyright (C) 2019 Storj Labs, Inc.
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// See LICENSE for copying information.
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// +build ignore
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package main
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import (
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"go/ast"
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"go/token"
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"golang.org/x/tools/go/analysis"
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"golang.org/x/tools/go/analysis/passes/inspect"
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"golang.org/x/tools/go/analysis/singlechecker"
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"golang.org/x/tools/go/ast/inspector"
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"golang.org/x/tools/go/types/typeutil"
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)
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func main() { singlechecker.Main(Analyzer) }
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var Analyzer = &analysis.Analyzer{
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Name: "errs",
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Doc: "check for proper usage of errs package",
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Run: run,
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Requires: []*analysis.Analyzer{
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inspect.Analyzer,
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},
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FactTypes: []analysis.Fact{},
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}
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func run(pass *analysis.Pass) (interface{}, error) {
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inspect := pass.ResultOf[inspect.Analyzer].(*inspector.Inspector)
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nodeFilter := []ast.Node{
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(*ast.CallExpr)(nil),
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}
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inspect.Preorder(nodeFilter, func(n ast.Node) {
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call := n.(*ast.CallExpr)
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fn := typeutil.StaticCallee(pass.TypesInfo, call)
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if fn == nil {
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return // not a static call
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}
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switch fn.FullName() {
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case "github.com/zeebo/errs.Combine":
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if len(call.Args) == 0 {
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pass.Reportf(call.Lparen, "errs.Combine() can be simplified to nil")
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}
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if len(call.Args) == 1 && call.Ellipsis == token.NoPos {
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pass.Reportf(call.Lparen, "errs.Combine(x) can be simplified to x")
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}
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case "(*github.com/zeebo/errs.Class).New":
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if len(call.Args) == 0 {
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return
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}
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// Disallow things like Error.New(err.Error())
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switch arg := call.Args[0].(type) {
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case *ast.BasicLit: // allow string constants
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case *ast.Ident: // allow string variables
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default:
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// allow "alpha" + "beta" + "gamma"
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if IsConcatString(arg) {
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return
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}
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pass.Reportf(call.Lparen, "(*errs.Class).New with non-obvious format string")
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}
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}
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})
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return nil, nil
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}
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func IsConcatString(arg ast.Expr) bool {
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switch arg := arg.(type) {
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case *ast.BasicLit:
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return arg.Kind == token.STRING
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case *ast.BinaryExpr:
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return arg.Op == token.ADD && IsConcatString(arg.X) && IsConcatString(arg.Y)
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default:
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return false
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}
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}
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