Add some additional logging to help debug golang/go#53586
For golang/go#53586
Change-Id: I0574fb01be47b265cd6e412855794bc2cb836dff
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It turns out PointSpan was only ever used as part of an oft repeated
pattern to get a token.Pos from a protocol position. Cut out the
middle.
Change-Id: I0b2c0fc3d335e6bbd3c1ac72c6f75e2c40c60ca5
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The TokenConverter has been trimmed down to a thin wrapper around
token.File, and can now be removed.
Change-Id: I9985492274c88e6a13e6d62dadab5595c75c7840
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Eliminate the need to work around newline terminated files in
completion, by storing selection ranges as token.Pos and using an
lsppos.TokenMapper derived from the file content, which does not have
problems with newline termination.
This simplifies the completion logic, and removes the last use of
MappedRange.SpanRange, which is an inconisitent API in that it returns
positions in the compiled source, rather than edited source.
Change-Id: I65232787956325172b48fd42d85cbb598039ee5a
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In cases like:
type foo[T any] struct{}
func bar[T any](foo[T]) {}
bar[int](<A>)
bar(<B>)
At <A> we will now offer "foo[int]{}". At <B> we will now offer a
snippet "foo[<T>]{}" which lets the user fill in the type arg.
Note that we have no knowledge of type inference, so you can be left
with superfluous type args after completion.
Change-Id: Ia7d63284f3317d9367864fdae3e3f9ae68fdff1a
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In cases like:
func foo[T int | string](T) {}
foo[int](<>)
Previously at <> we would favor int and string candidates. This is
because go/types doesn't instantiate foo in this case (for some
reason). Work around the issue by using types.CheckExpr to re-check
the *ast.CallExpr.Fun. CheckExpr seems to do a better than a full type
check in the face of errors.
Updates golang/go#52291
Updates golang/go#52503
Change-Id: Ide436428f3232db2e06ea3cc22ea250edbf28685
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In cases like:
func foo[A int|string](a A) {}
foo[_](<>)
We now prefer ints and strings at <> by matching against the type
constraint. Note that even if "_" is replaced with "int", we still
prefer strings since the type checker doesn't seem to want to
instantiate foo unless the params check out.
Change-Id: I0e7acfef0775752a96fcfe23e7e2e3d939820eee
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As of golang/go#50827, gopls no longer supports building at 1.12, and so
usage of golang.org/x/xerrors can be replaced with the native support for
error wrapping introduced in Go 1.13.
Remove this usage as a step toward eliminating the xerrors dependency
from x/tools.
For golang/go#52442
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Change-Id: I13cf73d7e043dda1a06c28bb09e413a76a68df1f
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For example:
func foo[A int | float64](a A) A { return a }
var _ int = fo<>
Previously at <> we would complete to "int(foo[A int|float64](a A))".
We added the int() type conversion because the returned type param A
was convertible to the expected "int" (i.e. both "int" and "float64"
can be converted). This is a premature suggestion, though, so fix by
suppressing such type conversions for type parameters.
Fixesgolang/go#51780.
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In this example:
func foo[A []int | []float64]() {}
foo[<>]
When completing at <> you were getting the creative candidate
"[]int | []float64". This came from some code that makes the expected
type available as a candidate if it wouldn't otherwise be found by a
lexical search. I tweaked the code in this case to instead look at
each structural type in the type constraint rather than the constraint
as a whole. In the above example you now get the candidates "[]int"
and "[]float64".
Change-Id: Ib8e422df3009cb4253ec66005b4a53851564c4e1
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Now when instantiating a generic function, we prefer type names that
are assignable to the corresponding constraint. For example:
func foo[A int|string]() {}
foo[<>]()
At <> we prefer the type names "int" and "string". Previously we had
no preference at all.
Updates golang/go#51782.
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The argument to f.Fuzz is determined, up to the names of arguments,
by the types of the arguments to f.Add. Inside the function argument
of f.Fuzz, only f.Name and f.Failed are allowed.
(The fset passed to fuzz was for debugging. When the change seems solid
it can be removed.)
Fixesgolang/go#51089
Change-Id: Icf8b8cdfd29e499bcc605a358ca9edaef5baa835
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In test files, function definitions starting with
Test, Bench, or Fuzz can be completed almost automatically.
For the snippets the user hits tab, completes the name, hits
tab again, and the function is defined, except (of course) for its
body.
Otherwise a completion that fills in the signature is proposed.
Where appropriate, 'TestMain(m *testing.M)' is also offered as
a completion.
Fixesgolang/go#46896 and golang/go#51089
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Guard against the panic in golang/go#49397, though it should not be
possible with well-formed AST.
Updates golang/go#49397
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The predeclared 'any' type is only valid when completing constraints. We
should support that properly, but for now exclude it from results so
that our completion tests don't fail on Go 1.18.
For golang/go#47669
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Tweak a few things to reduce garbage:
- Pre-allocate a couple hot error objects in format.go.
- Change methodsAndFields and packageMembers to take a callback
instead of returning a slice.
- Use two queues for breadth first search. This allows us to alternate
between and reuse the queues for each search level instead of
appending to a single queue indefinitely with no reuse.
- Get rid of candidate.names field. This tracked the string name of
each object in the deep completion path. Unlike with DFS before,
due to BFS this has to be copied for every candidate we inspect. Now
we get the object names from each types.Object in candidate.path,
with the addition of a new bitmask field to remember whether each
object needs "()" appended to it.
Using TestBenchmarkFuncDeepCompletion as a benchmark:
name old time/op new time/op delta
Statistics 14.2ms ± 7% 10.3ms ± 1% -27.41% (p=0.016 n=5+4)
name old alloc/op new alloc/op delta
Statistics 4.31MB ± 1% 3.03MB ± 0% -29.60% (p=0.016 n=5+4)
name old allocs/op new allocs/op delta
Statistics 52.7k ± 1% 44.0k ± 5% -16.52% (p=0.008 n=5+5)
Change-Id: I52f619d9a2e8553115be91f05cf8cc5cfa89123e
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For array, slice, maps and chan candidates, we now support
transforming them to their element type in completions. For example:
var m map[string]int
var _ int = m<>
At <> we complete to "m[]" because we see that the map value type
matches our expected type.
Fixesgolang/go#46045.
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Now we search up to three levels for candidate modifiers. For example,
we can now complete "foo" to "foo()()" (double invocation).
Granted this is rarely useful, but it generalizes and simplifies the
searching we did for dereference modifiers.
Updates golang/go#46045.
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"type mod" refers to agglutinative expressions such as dereference
"*", invocation "()", and slicing "[:]". When considering an object as
a completion candidate, we check whether applying a type mod would
make it a better candidate.
Previously we tracked the type mods we wanted to apply to a candidate
by setting bool fields. Now instead we keep a slice of the type mods.
This has two main advantages:
- The mods are now ordered which will allow us to format candidates
properly when the same mods can appear in different order (e.g.
"<-*foo" or *<-foo").
- We can now record any mod multiple times allowing for "<-<-foo" or
"foo()()".
I changed the formatting code to always create a snippet object since
that made things simpler. I had to tweak a few snippet helper methods
to accept a snippet argument rather than creating a new snippet.
This commit's only functional change is that we no longer show any
type mods in candidate labels. For example, the user will now see
"foo" in the completion popup instead of "*foo". Showing the operators
adds noise to the candidate list, and we didn't display them
consistently.
Updates golang/go#46045.
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In cases like:
var foo func(...interface{})
var one int
var two func() (int, int)
foo(<>)
At <> we were preferring "two()" over "one" because we were really
excited that the multi return value function was usable. "one" was not
preferred because the expected value is interface{} (we default to
saying candidates _don't_ match interface{} to give non-type based
aspects of candidate inference a chance to shine).
Fix by applying the corresponding interface{} logic to the assignees
checking: ignore the case of completing into func(...interface{})
since all multi return value functions would match.
Fixesgolang/go#46378.
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In LSP, CompletionItems can say if they are for deprecated names. This
CL implements that for items where the doc comments contain a line
starting // Deprecated.
Semantic tokens now similarly mark deprecated tokens, but in vscode
the default theme doesn't change the display, and the customization
options seem limited to:
"editor.semanticTokenColorCustomizations": {
"rules": {
// only foreground, bold, underline, italic
"*.deprecated": {"italic": true}
}
},
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For example:
var b [4]byte
var s []byte = <>
At <> we now prefer "b" and insert as "b[:]".
Fixesgolang/go#40277.
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Don't offer deep completions when completing the name of unimported
packages.
For example:
var _ int = <>
Completing at <> previously would offer an eclectic array of
candidates such as "bits.LeadingZeros()", "time.Now().Day()", or
"zlib.BestCompression", depending on your luck. These candidates stem
from unimported packages candidates such as "bits" which we continue
searching into for deep candidates.
There are two main reasons these deep completions are not useful:
1. They are not dependable. Not all unimported packages are even
searched (it stops as soon as it finds a set number).
2. Fuzzy matching does not work (e.g. typing "bilz" will not filter to
"bits.LeadingZeros" as it does in other cases).
2) could be remedied, but there are so many unimported
package members that I'm not sure it is possible to reduce false
positive deep completions to a satisfactory level.
I also made a couple relevant minor tweaks:
- Fallback sort the unimported packages by path to keep a consistent
order.
- Don't offer unimported packages at all if there is no prefix.
Updates golang/go#43374.
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Move postfix completion functionality behind an experimental option
flag. For now users can enable it by setting
"experimentalPostfixCompletions" or "allExperiments".
I added a RunnerOption so regtest tests can tweak *source.Options. I
didn't refactor the "Experimental" mode to use the new RunnerOption
because I didn't fully understand its purpose.
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Postfix snippets are artificial methods that allow the user to compose
common operations in an "argument oriented" fashion. For example,
instead of "sort.Slice(someSlice, ...)" a user can expand
"someSlice.sort!". The snippet labels end in "!" to make it clearer
they do something potentially unexpected. The postfix snippets have
low scores so they should not interfere with normal completions.
The snippets are represented (almost) entirely as Go text/template
templates. This way the user can create custom snippets to match their
general preferences or to capture common patterns in their codebase.
There is currently no way for the user to create snippets, but it
could be accomplished with a configuration file, custom LSP command,
or similar.
I started by implementing a variety of snippets to help flesh out the
various facilities needed by the templates. The most interesting
template capabilities are:
- The ability to import packages as necessary (e.g. "sort" must be
imported to call sort.Slice()).
- The ability to generate unique variable names to avoid accidental
shadowing issues.
- The ability to weave LSP snippets into the template. Currently,
only {{.Cursor}} is exposed, which corresponds to the snippet's
final tab stop.
Briefly, these are the postfix snippets in this commit:
- foo.sort => sort.Slice(foo, func(...){}) (slices)
- foo.last => foo[len(foo)-1] (slices)
- foo.reverse (slices)
- foo.range => for i, v := range foo {} (slices/maps)
- foo.append
This snippet inserts a self-assignment append statement when
appropriate, otherwise just an append expression.
- foo.copy creates a copy of a slice
- foo.clear empties out a map
- foo.keys creates slice of keys
- foo().var assigns result value(s) to variables
- foo.print prints foo to stdout
Some of these are probably not very useful in practice, and I'm sure
there are lots of great ones I didn't think of.
Updates golang/go#39507.
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The comparable interface is introduced on the dev.typeparams branch.
Filter it out from gopls completion results so that it doesn't break
tests on the dev.typeparams branch.
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For index expressions, optional "make" args, and composite literal
slice/array keys, we were inferring an expected type of int instead of
untyped int. This caused candidate rankings to not be quite right in
general, and in particular, after support for automatic type
conversions was added, the issue manifested as:
var foo []int
var bar int32
foo[ba<>] // completed to "int(bar)" instead of "bar"
Fixesgolang/go#43375.
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In cases like:
type foo struct { a int; b float64 }
foo{b<>}
We were completing to "foo{int(b: <float64>)}" (the problem being the
nonsensical int() conversion).
The expected type at "<>" is int to allow completions to match "a".
When we pass the *types.Var representing "b" through the candidate
matching machinery, we say "Oh, a float64! I can convert that to my
expected type of int!".
Fix by bailing out of candidate matching early if the candidate is a
composite literal struct field name. Field names aren't really objects
you can do anything to.
Fixesgolang/go#43789.
Change-Id: Ie4dab166973dfcdcb519f864532ead1f792d25a3
Reviewed-on: https://go-review.googlesource.com/c/tools/+/289130
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In cases like:
foo<> == 100
We weren't preferring floats at <>. Fix the basic type comparison
logic to know that an untyped int is always compatible with a float.
Fixesgolang/go#44066.
Change-Id: I9cf9bac1632178db100c0a5447351be208b4a2af
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Autocompleting a import without quotes appends to the completion,
producing this result: `import math "math/"`.
This commit changes to skip completions when typing a import without
quotes, because the users can be typing the alias of the import.
Fixes: golang/go#42748
Change-Id: I7050989f1f90a6720c17f71f338e50fad1f01456
GitHub-Last-Rev: e7b189a04acd8e501d6d7ac944d25de19156d0da
GitHub-Pull-Request: golang/tools#263
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When -mod=readonly and GOPROXY=off are set, the newly imported package
is not type-checked with the new import until it is reflected in the
go.mod file. In such cases, we can continue treating the package as
unimported and get symbols through unimported completions.
Fixesgolang/go#43339
Change-Id: I864c2c6738b537093c0670a266e9030af33f2d36
Reviewed-on: https://go-review.googlesource.com/c/tools/+/280095
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For example:
func wantsInt64(int64) {}
func wantsDuration(time.Duration) {}
func _() {
for i := range []string{} {
// inserts "i" as "int64(i)"
wantsInt64(i<>)
// inserts "i" as "time.Duration(i)"
wantsDuration(i<>)
}
}
Type converted candidates have a significant score penalty so they
should never outrank a directly assignable candidate, other factors
being equal.
To minimize false positive completions, we don't offer converted
candidates if either:
- The candidate is a deep completion into another package. This avoids
random "float64(somepkg.SomeVar)" popping up when completing a
float64.
- Don't offer to convert ints to strings since that's not normally
what the user wants.
After going back and forth I decided not to include the type
conversion in the candidate label. This means you will just see the
candidate "i" in the completion popup instead of "float64(i)". Type
names add a lot of noise to the candidate list.
I also tweaked the untyped constant penalty to interplay better with
the new type conversion penalty. I wanted untyped constants to be
ranked above type conversion candidates since they are directly
assignable, so I reduced untyped constants' penalty. However, to
continue suppressing untyped constants from random other packages, I
applied a similar heuristic to above where we give a bigger penalty if
the untyped constant is a deep completion from another package.
Fixesgolang/go#42764.
Updates golang/go#39207 (untyped constant penalty tweak may improve
this situation).
Change-Id: I565114b3a1c9628285d07200b9dfc45c61e5d898
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Previously struct fields completions are ordered alphabetically.
Now it is ordered by its order in definition.
Fixesgolang/go#42626
Change-Id: I8c404205b97fa9f1a5a66a95a84033b6f0f48eae
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I had originally wanted to create a shared code path for hover in all
cases, but hover has a lot more differences from the documentation in
signature help and completion than I expected. You can't use markdown,
and you probably don't want links--it would take a bigger refactor to
extract something that worked for each feature.
Handling the Structured and SingleLine hover setting also doesn't seem
necessary--those settings are really specific to the way the client
presents the hover, which isn't related to signature help or completion.
For completion, all we need is an extra check on the hover kind for the
NoDocumentation option.
Fixesgolang/go#38577
Change-Id: Ib2037906c13f5be26813fcd2c20989e4d1b6c9bd
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Type-checking can be very expensive for large packages and leave no
budget for shallow completions. This change adds a minimum budget of
10ms so we show the user at least some shallow suggestions.
Updates golang/go#41434
Change-Id: If2ef59c3fbdcfa2ebaabb21256cf606a4f9c14d6
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This changes bumps relevance for modules with major versions >1 so the
results for unimported members are ordered by major version.
Updates golang/go#41800
Change-Id: I64f4a1cf78a101acf4229433d06b5793246962f5
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This change eliminates any special scenarios where we need to call
c.item instead of going through deepSearch by adding support for all the
cases in deepSearch and c.addItem (previously c.item).
Change-Id: Ifb250be54da2f8c7b656475fcafaa38a4e306244
Reviewed-on: https://go-review.googlesource.com/c/tools/+/258858
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This change adds calls to c.matcher.score for commment completion so
comments match the prefix (or fuzzy match depending on user settings)
and don't end up giving the user too many irrelevant suggestions.
Change-Id: Ie660f82c491c17d52e68e781a812bf8053e501f8
Reviewed-on: https://go-review.googlesource.com/c/tools/+/258322
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This change removes contexts from functions that don't use them. Passing
down context unnecessarily leads to us having to propagate them
everywhere.
Change-Id: I1723721faf4f487b6cc92b9daef3f23747d9cbc1
Reviewed-on: https://go-review.googlesource.com/c/tools/+/258285
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Unimported completions are expensive and can use up a large portion of
completion budget just to find initial deep search candidates. This
change moves these expensive operations which search through the module
cache to after normal deep completions so we search through more useful
candidates first.
Fixesgolang/go#41434Fixesgolang/go#41665
Change-Id: I6f3963f8c65c1a97833a35738d2e96420de2f6ee
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This change switches over load and RunProcessEnvFunc to use the
snapshot's modules instead of the view's modURI. These do not seem to
have been the racy parts of CL 257417.
Change-Id: I317a350fc4b0c62d77858455a0e2e61148804ecd
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This change moves package selection to before type checking so we don't
unnecessarily type-check both variants of a package. As a result, exec
time and memory usage for features making calls to GetParsedFile are cut
by half since we only type check either the narrowest or the widest
package.
Change-Id: Ifd076f8c38e33de2bd3509fe17feafccd59d7419
Reviewed-on: https://go-review.googlesource.com/c/tools/+/257240
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This change refactors deep completion to move search path to a candidate
instead of pointing to it in search queue. This removes the idea of
"being in deep completion" and instead a deep candidate is just a
candidate with a path from search root.
Change-Id: Iec6a0f4409c0c8793986d5c1063000205ed43477
Reviewed-on: https://go-review.googlesource.com/c/tools/+/256417
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Currently, we deep search top level candidates as soon as they're found,
which isn't necessarily leading to an overall breadth first search
approach. This change refactors completion to add candidates to search
queue instead and only call deepSearch once at the end.
Change-Id: I712b03c98b57680a1f1c95df2385f7f2ea6e1ed0
Reviewed-on: https://go-review.googlesource.com/c/tools/+/256259
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This change improves the labels for import suggestions to only show the
last part of the path. Since VSCode fuzzy searches for labels in text
edit, we now return only the last part of path as text edit instead of
replacing the full import path. Just changing label while returning full
path leads to bad user experience.
Closesgolang/go#35877
Change-Id: Ib10e7a3e030dc9b850ff1d9ec8d45240b75b64a3
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This change converts deep completion from depth first search to breadth
first search.
Change-Id: Iebc7ba8d3acb44928220596065d4e8de53ea9b48
Reviewed-on: https://go-review.googlesource.com/c/tools/+/254542
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Robert Findley
Muir Manders
Dan Kortschak
Peter Weinberger
Matheus Alcantara
Rebecca Stambler
Chiawen Chen
Danish Dua