bf27481efd
full diff: https://github.com/dominikh/go-tools/compare/2019.2.3...2020.1.3 Also updates tests to accomodate updated rules: --- FAIL: TestSourcesFromTestdataWithIssuesDir/staticcheck.go (0.43s) linters_test.go:137: [run --disable-all --print-issued-lines=false --print-linter-name=false --out-format=line-number --max-same-issues=10 -Estaticcheck --no-config testdata/staticcheck.go] linters_test.go:33: Error Trace: linters_test.go:33 linters_test.go:138 linters_test.go:53 Error: Received unexpected error: staticcheck.go:11: no match for `self-assignment of x to x` vs ["SA4006: this value of `x` is never used"] in: staticcheck.go:11:2: SA4006: this value of `x` is never used unmatched errors staticcheck.go:11:2: SA4006: this value of `x` is never used Test: TestSourcesFromTestdataWithIssuesDir/staticcheck.go Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
72 lines
1.9 KiB
Go
72 lines
1.9 KiB
Go
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
|
|
}
|