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internal/lsp: stop formatting on files that do not parse

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This change will stop formatting from working on any file that does not
parse. This is a temporary fix to handle the formatting problems
mentioned here: https://github.com/Microsoft/vscode-go/issues/2410, but
is not a long-term solution.

Change-Id: Ie34b1876519832d6859db95fdcad7cc37a20b769
Reviewed-on: https://go-review.googlesource.com/c/tools/+/171019
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Cottrell <iancottrell@google.com>
This commit is contained in:
Rebecca Stambler 2019-04-05 18:05:31 -04:00
parent 12dd9f86f3
commit e5b8258f49
1 changed files with 14 additions and 17 deletions
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31
internal/lsp/source/format.go
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@ -9,11 +9,11 @@ import (
"bytes"
"context"
"fmt"
"go/ast"
"go/format"
"strings"
"golang.org/x/tools/go/ast/astutil"
"golang.org/x/tools/go/packages"
"golang.org/x/tools/imports"
"golang.org/x/tools/internal/lsp/diff"
"golang.org/x/tools/internal/span"
@ -21,28 +21,16 @@ import (
// Format formats a file with a given range.
func Format(ctx context.Context, f File, rng span.Range) ([]TextEdit, error) {
pkg := f.GetPackage(ctx)
if hasParseErrors(pkg.GetErrors()) {
return nil, fmt.Errorf("%s has parse errors, not formatting", f.URI())
}
fAST := f.GetAST(ctx)
path, exact := astutil.PathEnclosingInterval(fAST, rng.Start, rng.End)
if !exact || len(path) == 0 {
return nil, fmt.Errorf("no exact AST node matching the specified range")
}
node := path[0]
// format.Node can fail when the AST contains a bad expression or
// statement. For now, we preemptively check for one.
// TODO(rstambler): This should really return an error from format.Node.
var isBad bool
ast.Inspect(node, func(n ast.Node) bool {
switch n.(type) {
case *ast.BadDecl, *ast.BadExpr, *ast.BadStmt:
isBad = true
return false
default:
return true
}
})
if isBad {
return nil, fmt.Errorf("unable to format file due to a badly formatted AST")
}
// format.Node changes slightly from one release to another, so the version
// of Go used to build the LSP server will determine how it formats code.
// This should be acceptable for all users, who likely be prompted to rebuild
@ -55,6 +43,15 @@ func Format(ctx context.Context, f File, rng span.Range) ([]TextEdit, error) {
return computeTextEdits(ctx, f, buf.String()), nil
}
func hasParseErrors(errors []packages.Error) bool {
for _, err := range errors {
if err.Kind == packages.ParseError {
return true
}
}
return false
}
// Imports formats a file using the goimports tool.
func Imports(ctx context.Context, f File, rng span.Range) ([]TextEdit, error) {
formatted, err := imports.Process(f.GetToken(ctx).Name(), f.GetContent(ctx), nil)