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gitea/vendor/github.com/mgechev/revive/rule/string-of-int.go

95 lines
1.7 KiB

package rule
import (
"go/ast"
"go/types"
"github.com/mgechev/revive/lint"
)
// StringOfIntRule warns when logic expressions contains Boolean literals.
type StringOfIntRule struct{}
// Apply applies the rule to given file.
func (r *StringOfIntRule) Apply(file *lint.File, _ lint.Arguments) []lint.Failure {
var failures []lint.Failure
onFailure := func(failure lint.Failure) {
failures = append(failures, failure)
}
astFile := file.AST
file.Pkg.TypeCheck()
w := &lintStringInt{file, onFailure}
ast.Walk(w, astFile)
return failures
}
// Name returns the rule name.
func (r *StringOfIntRule) Name() string {
return "string-of-int"
}
type lintStringInt struct {
file *lint.File
onFailure func(lint.Failure)
}
func (w *lintStringInt) Visit(node ast.Node) ast.Visitor {
ce, ok := node.(*ast.CallExpr)
if !ok {
return w
}
if !w.isCallStringCast(ce.Fun) {
return w
}
if !w.isIntExpression(ce.Args) {
return w
}
w.onFailure(lint.Failure{
Confidence: 1,
Node: ce,
Failure: "dubious convertion of an integer into a string, use strconv.Itoa",
})
return w
}
func (w *lintStringInt) isCallStringCast(e ast.Expr) bool {
t := w.file.Pkg.TypeOf(e)
if t == nil {
return false
}
tb, _ := t.Underlying().(*types.Basic)
return tb != nil && tb.Kind() == types.String
}
func (w *lintStringInt) isIntExpression(es []ast.Expr) bool {
if len(es) != 1 {
return false
}
t := w.file.Pkg.TypeOf(es[0])
if t == nil {
return false
}
ut, _ := t.Underlying().(*types.Basic)
if ut == nil || ut.Info()&types.IsInteger == 0 {
return false
}
switch ut.Kind() {
case types.Byte, types.Rune, types.UntypedRune:
return false
}
return true
}