146 lines
3.1 KiB
Go
146 lines
3.1 KiB
Go
package rule
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import (
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"fmt"
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"github.com/mgechev/revive/lint"
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"go/ast"
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"go/token"
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)
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// RedefinesBuiltinIDRule warns when a builtin identifier is shadowed.
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type RedefinesBuiltinIDRule struct{}
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// Apply applies the rule to given file.
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func (r *RedefinesBuiltinIDRule) Apply(file *lint.File, _ lint.Arguments) []lint.Failure {
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var failures []lint.Failure
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var builtInConstAndVars = map[string]bool{
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"true": true,
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"false": true,
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"iota": true,
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"nil": true,
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}
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var builtFunctions = map[string]bool{
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"append": true,
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"cap": true,
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"close": true,
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"complex": true,
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"copy": true,
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"delete": true,
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"imag": true,
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"len": true,
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"make": true,
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"new": true,
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"panic": true,
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"print": true,
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"println": true,
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"real": true,
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"recover": true,
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}
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var builtInTypes = map[string]bool{
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"ComplexType": true,
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"FloatType": true,
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"IntegerType": true,
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"Type": true,
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"Type1": true,
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"bool": true,
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"byte": true,
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"complex128": true,
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"complex64": true,
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"error": true,
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"float32": true,
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"float64": true,
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"int": true,
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"int16": true,
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"int32": true,
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"int64": true,
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"int8": true,
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"rune": true,
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"string": true,
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"uint": true,
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"uint16": true,
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"uint32": true,
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"uint64": true,
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"uint8": true,
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"uintptr": true,
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}
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onFailure := func(failure lint.Failure) {
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failures = append(failures, failure)
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}
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astFile := file.AST
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w := &lintRedefinesBuiltinID{builtInConstAndVars, builtFunctions, builtInTypes, onFailure}
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ast.Walk(w, astFile)
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return failures
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}
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// Name returns the rule name.
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func (r *RedefinesBuiltinIDRule) Name() string {
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return "redefines-builtin-id"
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}
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type lintRedefinesBuiltinID struct {
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constsAndVars map[string]bool
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funcs map[string]bool
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types map[string]bool
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onFailure func(lint.Failure)
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}
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func (w *lintRedefinesBuiltinID) Visit(node ast.Node) ast.Visitor {
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switch n := node.(type) {
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case *ast.GenDecl:
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if n.Tok != token.TYPE {
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return nil // skip if not type declaration
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}
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typeSpec, ok := n.Specs[0].(*ast.TypeSpec)
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if !ok {
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return nil
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}
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id := typeSpec.Name.Name
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if w.types[id] {
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w.addFailure(n, fmt.Sprintf("redefinition of the built-in type %s", id))
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}
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case *ast.FuncDecl:
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if n.Recv != nil {
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return w // skip methods
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}
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id := n.Name.Name
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if w.funcs[id] {
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w.addFailure(n, fmt.Sprintf("redefinition of the built-in function %s", id))
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}
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case *ast.AssignStmt:
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for _, e := range n.Lhs {
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id, ok := e.(*ast.Ident)
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if !ok {
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continue
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}
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if w.constsAndVars[id.Name] {
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var msg string
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if n.Tok == token.DEFINE {
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msg = fmt.Sprintf("assignment creates a shadow of built-in identifier %s", id.Name)
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} else {
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msg = fmt.Sprintf("assignment modifies built-in identifier %s", id.Name)
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}
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w.addFailure(n, msg)
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}
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}
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}
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return w
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}
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func (w lintRedefinesBuiltinID) addFailure(node ast.Node, msg string) {
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w.onFailure(lint.Failure{
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Confidence: 1,
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Node: node,
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Category: "logic",
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Failure: msg,
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})
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}
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