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