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go/internal/lsp/testdata/foo/foo.go
Muir Manders 920acffc3e internal/lsp: fix bad *ast.ArrayTypes for completion
Currently array and slice literals don't work very well for
completion. When go/parser is not expecting a type, it often turns
array types (e.g. "[]int") into *ast.BadExpr, which messes up
completion because we can't figure out the prefix from *ast.BadExpr,
and *ast.BadExprs don't get type checked.

This change addresses the first problem of not being able to figure
out the prefix. If we see an *ast.BadExpr, we now blindly try to
reparse it as a composite literal by adding on "{}". If we end up with
an *ast.CompositeLit with an *ast.ArrayType "Type", we swap
the *ast.BadExpr for the *ast.ArrayType. This approach is dumb but
simple, and fixes lexical completions in array types.

Change-Id: Ifa42e646bcbf2a30170d73e6dd11982384d40b43
Reviewed-on: https://go-review.googlesource.com/c/tools/+/197437
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
Reviewed-by: Rebecca Stambler <rstambler@golang.org>
2019-10-17 20:53:01 +00:00

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Go

package foo //@mark(PackageFoo, "foo"),item(PackageFoo, "foo", "\"golang.org/x/tools/internal/lsp/foo\"", "package")
type StructFoo struct { //@item(StructFoo, "StructFoo", "struct{...}", "struct")
Value int //@item(Value, "Value", "int", "field")
}
// Pre-set this marker, as we don't have a "source" for it in this package.
/* Error() */ //@item(Error, "Error", "func() string", "method")
func Foo() { //@item(Foo, "Foo", "func()", "func")
var err error
err.Error() //@complete("E", Error)
}
func _() {
var sFoo StructFoo //@mark(sFoo1, "sFoo"),complete("t", StructFoo)
if x := sFoo; x.Value == 1 { //@mark(sFoo2, "sFoo"),complete("V", Value),typdef("sFoo", StructFoo),refs("sFo", sFoo1, sFoo2)
return
}
}
func _() {
shadowed := 123
{
shadowed := "hi" //@item(shadowed, "shadowed", "string", "var"),refs("shadowed", shadowed)
sha //@complete("a", shadowed)
}
}
type IntFoo int //@item(IntFoo, "IntFoo", "int", "type"),complete("", Foo, IntFoo, StructFoo)