71
vendor/honnef.co/go/tools/internal/sharedcheck/lint.go
vendored
Normal file
71
vendor/honnef.co/go/tools/internal/sharedcheck/lint.go
vendored
Normal file
@@ -0,0 +1,71 @@
|
||||
package sharedcheck
|
||||
|
||||
import (
|
||||
"go/ast"
|
||||
"go/types"
|
||||
|
||||
"golang.org/x/tools/go/analysis"
|
||||
"honnef.co/go/tools/code"
|
||||
"honnef.co/go/tools/internal/passes/buildir"
|
||||
"honnef.co/go/tools/ir"
|
||||
. "honnef.co/go/tools/lint/lintdsl"
|
||||
)
|
||||
|
||||
func CheckRangeStringRunes(pass *analysis.Pass) (interface{}, error) {
|
||||
for _, fn := range pass.ResultOf[buildir.Analyzer].(*buildir.IR).SrcFuncs {
|
||||
cb := func(node ast.Node) bool {
|
||||
rng, ok := node.(*ast.RangeStmt)
|
||||
if !ok || !code.IsBlank(rng.Key) {
|
||||
return true
|
||||
}
|
||||
|
||||
v, _ := fn.ValueForExpr(rng.X)
|
||||
|
||||
// Check that we're converting from string to []rune
|
||||
val, _ := v.(*ir.Convert)
|
||||
if val == nil {
|
||||
return true
|
||||
}
|
||||
Tsrc, ok := val.X.Type().(*types.Basic)
|
||||
if !ok || Tsrc.Kind() != types.String {
|
||||
return true
|
||||
}
|
||||
Tdst, ok := val.Type().(*types.Slice)
|
||||
if !ok {
|
||||
return true
|
||||
}
|
||||
TdstElem, ok := Tdst.Elem().(*types.Basic)
|
||||
if !ok || TdstElem.Kind() != types.Int32 {
|
||||
return true
|
||||
}
|
||||
|
||||
// Check that the result of the conversion is only used to
|
||||
// range over
|
||||
refs := val.Referrers()
|
||||
if refs == nil {
|
||||
return true
|
||||
}
|
||||
|
||||
// Expect two refs: one for obtaining the length of the slice,
|
||||
// one for accessing the elements
|
||||
if len(code.FilterDebug(*refs)) != 2 {
|
||||
// TODO(dh): right now, we check that only one place
|
||||
// refers to our slice. This will miss cases such as
|
||||
// ranging over the slice twice. Ideally, we'd ensure that
|
||||
// the slice is only used for ranging over (without
|
||||
// accessing the key), but that is harder to do because in
|
||||
// IR form, ranging over a slice looks like an ordinary
|
||||
// loop with index increments and slice accesses. We'd
|
||||
// have to look at the associated AST node to check that
|
||||
// it's a range statement.
|
||||
return true
|
||||
}
|
||||
|
||||
pass.Reportf(rng.Pos(), "should range over string, not []rune(string)")
|
||||
|
||||
return true
|
||||
}
|
||||
Inspect(fn.Source(), cb)
|
||||
}
|
||||
return nil, nil
|
||||
}
|
||||
Reference in New Issue
Block a user