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internal/lsp/source: do not allow extraction of an import spec

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Fixes golang/go#40635

Change-Id: Iab8ca37d251a95334c19f32873f9ba9cc1bdd2f4
Reviewed-on: https://go-review.googlesource.com/c/tools/+/251018
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
This commit is contained in:
Rebecca Stambler 2020-08-27 00:51:55 -04:00
parent df83f4e7c1
commit 989ebae23e
1 changed files with 8 additions and 4 deletions
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12
internal/lsp/source/extract.go
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@ -31,10 +31,9 @@ func extractVariable(fset *token.FileSet, rng span.Range, src []byte, file *ast.
var lhsNames []string
switch expr := expr.(type) {
// TODO: stricter rules for selectorExpr.
case *ast.BasicLit, *ast.CompositeLit, *ast.IndexExpr, *ast.SliceExpr, *ast.UnaryExpr,
*ast.BinaryExpr, *ast.SelectorExpr:
lhsNames = append(lhsNames,
generateAvailableIdentifier(expr.Pos(), file, path, info, "x", 0))
case *ast.BasicLit, *ast.CompositeLit, *ast.IndexExpr, *ast.SliceExpr,
*ast.UnaryExpr, *ast.BinaryExpr, *ast.SelectorExpr:
lhsNames = append(lhsNames, generateAvailableIdentifier(expr.Pos(), file, path, info, "x", 0))
case *ast.CallExpr:
tup, ok := info.TypeOf(expr).(*types.Tuple)
if !ok {
@ -101,6 +100,11 @@ func canExtractVariable(rng span.Range, file *ast.File) (ast.Expr, []ast.Node, b
if len(path) == 0 {
return nil, nil, false, fmt.Errorf("no path enclosing interval")
}
for _, n := range path {
if _, ok := n.(*ast.ImportSpec); ok {
return nil, nil, false, fmt.Errorf("cannot extract variable in an import block")
}
}
node := path[0]
if rng.Start != node.Pos() || rng.End != node.End() {
return nil, nil, false, fmt.Errorf("range does not map to an AST node")