638 lines
17 KiB
Go
638 lines
17 KiB
Go
package stylecheck // import "honnef.co/go/tools/stylecheck"
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import (
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"fmt"
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"go/ast"
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"go/constant"
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"go/token"
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"go/types"
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"strconv"
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"strings"
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"unicode"
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"unicode/utf8"
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"honnef.co/go/tools/lint"
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. "honnef.co/go/tools/lint/lintdsl"
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"honnef.co/go/tools/ssa"
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"golang.org/x/tools/go/types/typeutil"
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)
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type Checker struct {
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CheckGenerated bool
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}
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func NewChecker() *Checker {
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return &Checker{}
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}
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func (*Checker) Name() string { return "stylecheck" }
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func (*Checker) Prefix() string { return "ST" }
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func (c *Checker) Init(prog *lint.Program) {}
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func (c *Checker) Checks() []lint.Check {
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return []lint.Check{
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{ID: "ST1000", FilterGenerated: false, Fn: c.CheckPackageComment, Doc: docST1000},
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{ID: "ST1001", FilterGenerated: true, Fn: c.CheckDotImports, Doc: docST1001},
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// {ID: "ST1002", FilterGenerated: true, Fn: c.CheckBlankImports, Doc: docST1002},
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{ID: "ST1003", FilterGenerated: true, Fn: c.CheckNames, Doc: docST1003},
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// {ID: "ST1004", FilterGenerated: false, Fn: nil, , Doc: docST1004},
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{ID: "ST1005", FilterGenerated: false, Fn: c.CheckErrorStrings, Doc: docST1005},
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{ID: "ST1006", FilterGenerated: false, Fn: c.CheckReceiverNames, Doc: docST1006},
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// {ID: "ST1007", FilterGenerated: true, Fn: c.CheckIncDec, Doc: docST1007},
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{ID: "ST1008", FilterGenerated: false, Fn: c.CheckErrorReturn, Doc: docST1008},
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// {ID: "ST1009", FilterGenerated: false, Fn: c.CheckUnexportedReturn, Doc: docST1009},
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// {ID: "ST1010", FilterGenerated: false, Fn: c.CheckContextFirstArg, Doc: docST1010},
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{ID: "ST1011", FilterGenerated: false, Fn: c.CheckTimeNames, Doc: docST1011},
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{ID: "ST1012", FilterGenerated: false, Fn: c.CheckErrorVarNames, Doc: docST1012},
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{ID: "ST1013", FilterGenerated: true, Fn: c.CheckHTTPStatusCodes, Doc: docST1013},
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{ID: "ST1015", FilterGenerated: true, Fn: c.CheckDefaultCaseOrder, Doc: docST1015},
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{ID: "ST1016", FilterGenerated: false, Fn: c.CheckReceiverNamesIdentical, Doc: docST1016},
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{ID: "ST1017", FilterGenerated: true, Fn: c.CheckYodaConditions, Doc: docST1017},
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{ID: "ST1018", FilterGenerated: false, Fn: c.CheckInvisibleCharacters, Doc: docST1018},
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}
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}
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func (c *Checker) CheckPackageComment(j *lint.Job) {
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// - At least one file in a non-main package should have a package comment
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//
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// - The comment should be of the form
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// "Package x ...". This has a slight potential for false
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// positives, as multiple files can have package comments, in
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// which case they get appended. But that doesn't happen a lot in
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// the real world.
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if j.Pkg.Name == "main" {
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return
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}
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hasDocs := false
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for _, f := range j.Pkg.Syntax {
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if IsInTest(j, f) {
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continue
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}
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if f.Doc != nil && len(f.Doc.List) > 0 {
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hasDocs = true
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prefix := "Package " + f.Name.Name + " "
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if !strings.HasPrefix(strings.TrimSpace(f.Doc.Text()), prefix) {
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j.Errorf(f.Doc, `package comment should be of the form "%s..."`, prefix)
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}
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f.Doc.Text()
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}
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}
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if !hasDocs {
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for _, f := range j.Pkg.Syntax {
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if IsInTest(j, f) {
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continue
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}
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j.Errorf(f, "at least one file in a package should have a package comment")
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}
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}
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}
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func (c *Checker) CheckDotImports(j *lint.Job) {
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for _, f := range j.Pkg.Syntax {
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imports:
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for _, imp := range f.Imports {
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path := imp.Path.Value
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path = path[1 : len(path)-1]
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for _, w := range j.Pkg.Config.DotImportWhitelist {
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if w == path {
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continue imports
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}
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}
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if imp.Name != nil && imp.Name.Name == "." && !IsInTest(j, f) {
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j.Errorf(imp, "should not use dot imports")
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}
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}
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}
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}
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func (c *Checker) CheckBlankImports(j *lint.Job) {
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fset := j.Pkg.Fset
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for _, f := range j.Pkg.Syntax {
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if IsInMain(j, f) || IsInTest(j, f) {
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continue
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}
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// Collect imports of the form `import _ "foo"`, i.e. with no
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// parentheses, as their comment will be associated with the
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// (paren-free) GenDecl, not the import spec itself.
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//
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// We don't directly process the GenDecl so that we can
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// correctly handle the following:
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//
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// import _ "foo"
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// import _ "bar"
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//
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// where only the first import should get flagged.
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skip := map[ast.Spec]bool{}
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ast.Inspect(f, func(node ast.Node) bool {
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switch node := node.(type) {
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case *ast.File:
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return true
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case *ast.GenDecl:
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if node.Tok != token.IMPORT {
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return false
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}
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if node.Lparen == token.NoPos && node.Doc != nil {
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skip[node.Specs[0]] = true
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}
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return false
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}
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return false
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})
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for i, imp := range f.Imports {
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pos := fset.Position(imp.Pos())
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if !IsBlank(imp.Name) {
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continue
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}
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// Only flag the first blank import in a group of imports,
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// or don't flag any of them, if the first one is
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// commented
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if i > 0 {
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prev := f.Imports[i-1]
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prevPos := fset.Position(prev.Pos())
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if pos.Line-1 == prevPos.Line && IsBlank(prev.Name) {
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continue
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}
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}
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if imp.Doc == nil && imp.Comment == nil && !skip[imp] {
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j.Errorf(imp, "a blank import should be only in a main or test package, or have a comment justifying it")
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}
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}
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}
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}
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func (c *Checker) CheckIncDec(j *lint.Job) {
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// TODO(dh): this can be noisy for function bodies that look like this:
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// x += 3
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// ...
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// x += 2
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// ...
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// x += 1
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fn := func(node ast.Node) {
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assign := node.(*ast.AssignStmt)
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if assign.Tok != token.ADD_ASSIGN && assign.Tok != token.SUB_ASSIGN {
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return
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}
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if (len(assign.Lhs) != 1 || len(assign.Rhs) != 1) ||
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!IsIntLiteral(assign.Rhs[0], "1") {
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return
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}
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suffix := ""
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switch assign.Tok {
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case token.ADD_ASSIGN:
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suffix = "++"
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case token.SUB_ASSIGN:
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suffix = "--"
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}
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j.Errorf(assign, "should replace %s with %s%s", Render(j, assign), Render(j, assign.Lhs[0]), suffix)
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}
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j.Pkg.Inspector.Preorder([]ast.Node{(*ast.AssignStmt)(nil)}, fn)
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}
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func (c *Checker) CheckErrorReturn(j *lint.Job) {
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fnLoop:
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for _, fn := range j.Pkg.InitialFunctions {
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sig := fn.Type().(*types.Signature)
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rets := sig.Results()
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if rets == nil || rets.Len() < 2 {
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continue
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}
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if rets.At(rets.Len()-1).Type() == types.Universe.Lookup("error").Type() {
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// Last return type is error. If the function also returns
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// errors in other positions, that's fine.
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continue
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}
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for i := rets.Len() - 2; i >= 0; i-- {
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if rets.At(i).Type() == types.Universe.Lookup("error").Type() {
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j.Errorf(rets.At(i), "error should be returned as the last argument")
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continue fnLoop
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}
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}
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}
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}
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// CheckUnexportedReturn checks that exported functions on exported
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// types do not return unexported types.
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func (c *Checker) CheckUnexportedReturn(j *lint.Job) {
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for _, fn := range j.Pkg.InitialFunctions {
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if fn.Synthetic != "" || fn.Parent() != nil {
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continue
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}
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if !ast.IsExported(fn.Name()) || IsInMain(j, fn) || IsInTest(j, fn) {
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continue
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}
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sig := fn.Type().(*types.Signature)
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if sig.Recv() != nil && !ast.IsExported(Dereference(sig.Recv().Type()).(*types.Named).Obj().Name()) {
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continue
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}
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res := sig.Results()
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for i := 0; i < res.Len(); i++ {
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if named, ok := DereferenceR(res.At(i).Type()).(*types.Named); ok &&
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!ast.IsExported(named.Obj().Name()) &&
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named != types.Universe.Lookup("error").Type() {
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j.Errorf(fn, "should not return unexported type")
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}
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}
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}
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}
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func (c *Checker) CheckReceiverNames(j *lint.Job) {
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for _, m := range j.Pkg.SSA.Members {
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if T, ok := m.Object().(*types.TypeName); ok && !T.IsAlias() {
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ms := typeutil.IntuitiveMethodSet(T.Type(), nil)
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for _, sel := range ms {
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fn := sel.Obj().(*types.Func)
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recv := fn.Type().(*types.Signature).Recv()
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if Dereference(recv.Type()) != T.Type() {
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// skip embedded methods
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continue
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}
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if recv.Name() == "self" || recv.Name() == "this" {
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j.Errorf(recv, `receiver name should be a reflection of its identity; don't use generic names such as "this" or "self"`)
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}
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if recv.Name() == "_" {
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j.Errorf(recv, "receiver name should not be an underscore, omit the name if it is unused")
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}
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}
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}
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}
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}
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func (c *Checker) CheckReceiverNamesIdentical(j *lint.Job) {
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for _, m := range j.Pkg.SSA.Members {
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names := map[string]int{}
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var firstFn *types.Func
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if T, ok := m.Object().(*types.TypeName); ok && !T.IsAlias() {
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ms := typeutil.IntuitiveMethodSet(T.Type(), nil)
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for _, sel := range ms {
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fn := sel.Obj().(*types.Func)
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recv := fn.Type().(*types.Signature).Recv()
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if Dereference(recv.Type()) != T.Type() {
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// skip embedded methods
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continue
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}
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if firstFn == nil {
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firstFn = fn
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}
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if recv.Name() != "" && recv.Name() != "_" {
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names[recv.Name()]++
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}
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}
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}
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if len(names) > 1 {
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var seen []string
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for name, count := range names {
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seen = append(seen, fmt.Sprintf("%dx %q", count, name))
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}
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j.Errorf(firstFn, "methods on the same type should have the same receiver name (seen %s)", strings.Join(seen, ", "))
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}
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}
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}
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func (c *Checker) CheckContextFirstArg(j *lint.Job) {
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// TODO(dh): this check doesn't apply to test helpers. Example from the stdlib:
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// func helperCommandContext(t *testing.T, ctx context.Context, s ...string) (cmd *exec.Cmd) {
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fnLoop:
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for _, fn := range j.Pkg.InitialFunctions {
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if fn.Synthetic != "" || fn.Parent() != nil {
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continue
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}
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params := fn.Signature.Params()
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if params.Len() < 2 {
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continue
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}
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if types.TypeString(params.At(0).Type(), nil) == "context.Context" {
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continue
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}
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for i := 1; i < params.Len(); i++ {
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param := params.At(i)
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if types.TypeString(param.Type(), nil) == "context.Context" {
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j.Errorf(param, "context.Context should be the first argument of a function")
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continue fnLoop
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}
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}
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}
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}
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func (c *Checker) CheckErrorStrings(j *lint.Job) {
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objNames := map[*ssa.Package]map[string]bool{}
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ssapkg := j.Pkg.SSA
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objNames[ssapkg] = map[string]bool{}
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for _, m := range ssapkg.Members {
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if typ, ok := m.(*ssa.Type); ok {
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objNames[ssapkg][typ.Name()] = true
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}
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}
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for _, fn := range j.Pkg.InitialFunctions {
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objNames[fn.Package()][fn.Name()] = true
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}
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for _, fn := range j.Pkg.InitialFunctions {
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if IsInTest(j, fn) {
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// We don't care about malformed error messages in tests;
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// they're usually for direct human consumption, not part
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// of an API
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continue
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}
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for _, block := range fn.Blocks {
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instrLoop:
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for _, ins := range block.Instrs {
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call, ok := ins.(*ssa.Call)
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if !ok {
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continue
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}
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if !IsCallTo(call.Common(), "errors.New") && !IsCallTo(call.Common(), "fmt.Errorf") {
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continue
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}
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k, ok := call.Common().Args[0].(*ssa.Const)
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if !ok {
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continue
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}
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s := constant.StringVal(k.Value)
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if len(s) == 0 {
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continue
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}
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switch s[len(s)-1] {
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case '.', ':', '!', '\n':
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j.Errorf(call, "error strings should not end with punctuation or a newline")
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}
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idx := strings.IndexByte(s, ' ')
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if idx == -1 {
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// single word error message, probably not a real
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// error but something used in tests or during
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// debugging
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continue
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}
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word := s[:idx]
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first, n := utf8.DecodeRuneInString(word)
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if !unicode.IsUpper(first) {
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continue
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}
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for _, c := range word[n:] {
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if unicode.IsUpper(c) {
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// Word is probably an initialism or
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// multi-word function name
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continue instrLoop
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}
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}
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word = strings.TrimRightFunc(word, func(r rune) bool { return unicode.IsPunct(r) })
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if objNames[fn.Package()][word] {
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// Word is probably the name of a function or type in this package
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continue
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}
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// First word in error starts with a capital
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// letter, and the word doesn't contain any other
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// capitals, making it unlikely to be an
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// initialism or multi-word function name.
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//
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// It could still be a proper noun, though.
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j.Errorf(call, "error strings should not be capitalized")
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}
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}
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}
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}
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func (c *Checker) CheckTimeNames(j *lint.Job) {
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suffixes := []string{
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"Sec", "Secs", "Seconds",
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"Msec", "Msecs",
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"Milli", "Millis", "Milliseconds",
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"Usec", "Usecs", "Microseconds",
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"MS", "Ms",
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}
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fn := func(T types.Type, names []*ast.Ident) {
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if !IsType(T, "time.Duration") && !IsType(T, "*time.Duration") {
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return
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}
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for _, name := range names {
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for _, suffix := range suffixes {
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if strings.HasSuffix(name.Name, suffix) {
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j.Errorf(name, "var %s is of type %v; don't use unit-specific suffix %q", name.Name, T, suffix)
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break
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}
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}
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}
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}
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for _, f := range j.Pkg.Syntax {
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ast.Inspect(f, func(node ast.Node) bool {
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switch node := node.(type) {
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case *ast.ValueSpec:
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T := j.Pkg.TypesInfo.TypeOf(node.Type)
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fn(T, node.Names)
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case *ast.FieldList:
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for _, field := range node.List {
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T := j.Pkg.TypesInfo.TypeOf(field.Type)
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fn(T, field.Names)
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}
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}
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return true
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})
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}
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}
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func (c *Checker) CheckErrorVarNames(j *lint.Job) {
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for _, f := range j.Pkg.Syntax {
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for _, decl := range f.Decls {
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gen, ok := decl.(*ast.GenDecl)
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if !ok || gen.Tok != token.VAR {
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continue
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}
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for _, spec := range gen.Specs {
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spec := spec.(*ast.ValueSpec)
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if len(spec.Names) != len(spec.Values) {
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continue
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}
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for i, name := range spec.Names {
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val := spec.Values[i]
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if !IsCallToAST(j, val, "errors.New") && !IsCallToAST(j, val, "fmt.Errorf") {
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continue
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}
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prefix := "err"
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if name.IsExported() {
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prefix = "Err"
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}
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if !strings.HasPrefix(name.Name, prefix) {
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j.Errorf(name, "error var %s should have name of the form %sFoo", name.Name, prefix)
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}
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}
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}
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}
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}
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}
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var httpStatusCodes = map[int]string{
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100: "StatusContinue",
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101: "StatusSwitchingProtocols",
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102: "StatusProcessing",
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200: "StatusOK",
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201: "StatusCreated",
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202: "StatusAccepted",
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203: "StatusNonAuthoritativeInfo",
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204: "StatusNoContent",
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205: "StatusResetContent",
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206: "StatusPartialContent",
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207: "StatusMultiStatus",
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208: "StatusAlreadyReported",
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226: "StatusIMUsed",
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300: "StatusMultipleChoices",
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301: "StatusMovedPermanently",
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302: "StatusFound",
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303: "StatusSeeOther",
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304: "StatusNotModified",
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305: "StatusUseProxy",
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307: "StatusTemporaryRedirect",
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308: "StatusPermanentRedirect",
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400: "StatusBadRequest",
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401: "StatusUnauthorized",
|
|
402: "StatusPaymentRequired",
|
|
403: "StatusForbidden",
|
|
404: "StatusNotFound",
|
|
405: "StatusMethodNotAllowed",
|
|
406: "StatusNotAcceptable",
|
|
407: "StatusProxyAuthRequired",
|
|
408: "StatusRequestTimeout",
|
|
409: "StatusConflict",
|
|
410: "StatusGone",
|
|
411: "StatusLengthRequired",
|
|
412: "StatusPreconditionFailed",
|
|
413: "StatusRequestEntityTooLarge",
|
|
414: "StatusRequestURITooLong",
|
|
415: "StatusUnsupportedMediaType",
|
|
416: "StatusRequestedRangeNotSatisfiable",
|
|
417: "StatusExpectationFailed",
|
|
418: "StatusTeapot",
|
|
422: "StatusUnprocessableEntity",
|
|
423: "StatusLocked",
|
|
424: "StatusFailedDependency",
|
|
426: "StatusUpgradeRequired",
|
|
428: "StatusPreconditionRequired",
|
|
429: "StatusTooManyRequests",
|
|
431: "StatusRequestHeaderFieldsTooLarge",
|
|
451: "StatusUnavailableForLegalReasons",
|
|
500: "StatusInternalServerError",
|
|
501: "StatusNotImplemented",
|
|
502: "StatusBadGateway",
|
|
503: "StatusServiceUnavailable",
|
|
504: "StatusGatewayTimeout",
|
|
505: "StatusHTTPVersionNotSupported",
|
|
506: "StatusVariantAlsoNegotiates",
|
|
507: "StatusInsufficientStorage",
|
|
508: "StatusLoopDetected",
|
|
510: "StatusNotExtended",
|
|
511: "StatusNetworkAuthenticationRequired",
|
|
}
|
|
|
|
func (c *Checker) CheckHTTPStatusCodes(j *lint.Job) {
|
|
whitelist := map[string]bool{}
|
|
for _, code := range j.Pkg.Config.HTTPStatusCodeWhitelist {
|
|
whitelist[code] = true
|
|
}
|
|
fn := func(node ast.Node) bool {
|
|
call, ok := node.(*ast.CallExpr)
|
|
if !ok {
|
|
return true
|
|
}
|
|
|
|
var arg int
|
|
switch CallNameAST(j, call) {
|
|
case "net/http.Error":
|
|
arg = 2
|
|
case "net/http.Redirect":
|
|
arg = 3
|
|
case "net/http.StatusText":
|
|
arg = 0
|
|
case "net/http.RedirectHandler":
|
|
arg = 1
|
|
default:
|
|
return true
|
|
}
|
|
lit, ok := call.Args[arg].(*ast.BasicLit)
|
|
if !ok {
|
|
return true
|
|
}
|
|
if whitelist[lit.Value] {
|
|
return true
|
|
}
|
|
|
|
n, err := strconv.Atoi(lit.Value)
|
|
if err != nil {
|
|
return true
|
|
}
|
|
s, ok := httpStatusCodes[n]
|
|
if !ok {
|
|
return true
|
|
}
|
|
j.Errorf(lit, "should use constant http.%s instead of numeric literal %d", s, n)
|
|
return true
|
|
}
|
|
for _, f := range j.Pkg.Syntax {
|
|
ast.Inspect(f, fn)
|
|
}
|
|
}
|
|
|
|
func (c *Checker) CheckDefaultCaseOrder(j *lint.Job) {
|
|
fn := func(node ast.Node) {
|
|
stmt := node.(*ast.SwitchStmt)
|
|
list := stmt.Body.List
|
|
for i, c := range list {
|
|
if c.(*ast.CaseClause).List == nil && i != 0 && i != len(list)-1 {
|
|
j.Errorf(c, "default case should be first or last in switch statement")
|
|
break
|
|
}
|
|
}
|
|
}
|
|
j.Pkg.Inspector.Preorder([]ast.Node{(*ast.SwitchStmt)(nil)}, fn)
|
|
}
|
|
|
|
func (c *Checker) CheckYodaConditions(j *lint.Job) {
|
|
fn := func(node ast.Node) {
|
|
cond := node.(*ast.BinaryExpr)
|
|
if cond.Op != token.EQL && cond.Op != token.NEQ {
|
|
return
|
|
}
|
|
if _, ok := cond.X.(*ast.BasicLit); !ok {
|
|
return
|
|
}
|
|
if _, ok := cond.Y.(*ast.BasicLit); ok {
|
|
// Don't flag lit == lit conditions, just in case
|
|
return
|
|
}
|
|
j.Errorf(cond, "don't use Yoda conditions")
|
|
}
|
|
j.Pkg.Inspector.Preorder([]ast.Node{(*ast.BinaryExpr)(nil)}, fn)
|
|
}
|
|
|
|
func (c *Checker) CheckInvisibleCharacters(j *lint.Job) {
|
|
fn := func(node ast.Node) {
|
|
lit := node.(*ast.BasicLit)
|
|
if lit.Kind != token.STRING {
|
|
return
|
|
}
|
|
for _, r := range lit.Value {
|
|
if unicode.Is(unicode.Cf, r) {
|
|
j.Errorf(lit, "string literal contains the Unicode format character %U, consider using the %q escape sequence", r, r)
|
|
} else if unicode.Is(unicode.Cc, r) && r != '\n' && r != '\t' && r != '\r' {
|
|
j.Errorf(lit, "string literal contains the Unicode control character %U, consider using the %q escape sequence", r, r)
|
|
}
|
|
}
|
|
}
|
|
j.Pkg.Inspector.Preorder([]ast.Node{(*ast.BasicLit)(nil)}, fn)
|
|
}
|