103 lines
2.7 KiB
Go
103 lines
2.7 KiB
Go
package rule
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import (
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"fmt"
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"go/ast"
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"go/token"
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"strings"
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"github.com/mgechev/revive/lint"
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)
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// ImportShadowingRule lints given else constructs.
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type ImportShadowingRule struct{}
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// Apply applies the rule to given file.
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func (r *ImportShadowingRule) Apply(file *lint.File, _ lint.Arguments) []lint.Failure {
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var failures []lint.Failure
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importNames := map[string]struct{}{}
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for _, imp := range file.AST.Imports {
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importNames[getName(imp)] = struct{}{}
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}
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fileAst := file.AST
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walker := importShadowing{
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importNames: importNames,
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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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alreadySeen: map[*ast.Object]struct{}{},
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}
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ast.Walk(walker, fileAst)
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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 *ImportShadowingRule) Name() string {
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return "import-shadowing"
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}
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func getName(imp *ast.ImportSpec) string {
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const pathSep = "/"
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const strDelim = `"`
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if imp.Name != nil {
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return imp.Name.Name
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}
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path := imp.Path.Value
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i := strings.LastIndex(path, pathSep)
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if i == -1 {
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return strings.Trim(path, strDelim)
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}
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return strings.Trim(path[i+1:], strDelim)
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}
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type importShadowing struct {
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importNames map[string]struct{}
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onFailure func(lint.Failure)
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alreadySeen map[*ast.Object]struct{}
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}
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// Visit visits AST nodes and checks if id nodes (ast.Ident) shadow an import name
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func (w importShadowing) Visit(n ast.Node) ast.Visitor {
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switch n := n.(type) {
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case *ast.AssignStmt:
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if n.Tok == token.DEFINE {
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return w // analyze variable declarations of the form id := expr
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}
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return nil // skip assigns of the form id = expr (not an id declaration)
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case *ast.CallExpr, // skip call expressions (not an id declaration)
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*ast.ImportSpec, // skip import section subtree because we already have the list of imports
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*ast.KeyValueExpr, // skip analysis of key-val expressions ({key:value}): ids of such expressions, even the same of an import name, do not shadow the import name
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*ast.ReturnStmt, // skip skipping analysis of returns, ids in expression were already analyzed
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*ast.SelectorExpr, // skip analysis of selector expressions (anId.otherId): because if anId shadows an import name, it was already detected, and otherId does not shadows the import name
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*ast.StructType: // skip analysis of struct type because struct fields can not shadow an import name
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return nil
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case *ast.Ident:
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id := n.Name
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if id == "_" {
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return w // skip _ id
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}
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_, isImportName := w.importNames[id]
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_, alreadySeen := w.alreadySeen[n.Obj]
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if isImportName && !alreadySeen {
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w.onFailure(lint.Failure{
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Confidence: 1,
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Node: n,
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Category: "namming",
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Failure: fmt.Sprintf("The name '%s' shadows an import name", id),
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})
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w.alreadySeen[n.Obj] = struct{}{}
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}
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}
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return w
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}
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