Despite the name, ParseExported only hollowed out declarations -- it
didn't actually drop any from the AST. This leaves a fair amount of
unexported crud behind. Unfortunately, there are a *lot* of ways to
expose an unexported declaration from an exported one, and it can be
done across files. Because of that, discarding unexported declarations
requires a lot of work.
This CL implements a decent attempt at pruning as much as possible from
the AST in ParseExported mode.
First, we analyze the AST of all the files in the package for exported
uses of unexported identifiers, iterating to a fixed point. Then, we
type check those ASTs. If there are missing identifiers (probably due to
a bug in the dependency analysis) we use those errors to re-parse. After
that we give up and fall back to the older, less effective trimming. The
pkg type changes slightly to accomodate the new control flow.
We have to analyze all the files at once because an unexported type
might be exposed in another file. Unfortunately, that means we can't
parse a single file at a time any more -- the result of parsing a file
depends on the result of parsing its siblings. To avoid cache
corruption, we have to do the parsing directly in type checking,
uncached.
This, in turn, required changes to the PosTo* functions. Previously,
they operated just on files, but a file name is no longer sufficient to
get a ParseExported AST. Change them to work on Packages instead. I
squeezed in a bit of refactoring while I was touching them.
Change-Id: I61249144ffa43ad645ed38d79e873e3998b0f38d
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In cases like:
append([]string{}, foo<>)
we now prefer objects of type string at <>. Previously we had no
preference. In particular, we now try to infer the slice type from the
first append() arg instead of only from the outer context of the
append() call.
Fixesgolang/go#43240.
Change-Id: I59dfa3b18892c5c87fc5ff53109f51f50ee03d26
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ast.NewPackage mutates the input files, making it difficult to avoid
races with our caching model. I had avoided a race resulting from cache
handle cancellation, just to run into another race in multi-session
servers.
But there's no reason to use ast.NewPackage when we only have a single
file. We can just interrogate the file scope wherever needed.
Fixesgolang/go#45868
Change-Id: I521475b51ee3b1c3e408916affecafbc629b0191
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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}
}
},
Change-Id: I93ccc227bf4e1e30a4f23b40da4d2cbafe1cd925
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Before this change directory names were used "as is" for package completion.
It could lead to invalid suggestions (for example, 'package 1abc' or package 'ab-cd').
This change adds a check whether a directory name can be used in a package path.
If the directory name is invalid, only 'package main' will be suggested.
Otherwise, the directory name will be normalized and will be used as a package name.
Note: normalized directory names contain only lower case letters and digits.
Fixesgolang/go#44680
Change-Id: I4b710f90d1723c512e29dc3c248a1e681f1cd37f
GitHub-Last-Rev: 8ae69f1c6fdf80831e5773bdb3507a8d51a4a0cf
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In cases like:
foo.<>
bar = 123
We weren't detecting that the selector preceding <> was a statement.
The above is parsed as "foo.<>bar = 123", so it looks like <> is
contained in an AssignStmt. This matters because we give different
postfix completions depending on whether it is valid to replace the
surrounding selector with a statement or not.
Updates golang/go#45718.
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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.
Change-Id: I9fbcde34a3a9e7781568515bddab9da2fc931139
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There are 2 different anonymous struct declarations that require
different approaches:
1. var x struct{...}
2. x := struct{...}{}
For the first one we can use the existing solution with a minor update.
However, it returns the wrong docs for the fields of nested structs.
To fix this we need to visit all fields recursively.
The second one is not a generic declaration. So, the simplest solution
is to use the method Snapshot.PosToField.
Fixesgolang/go#43675
Change-Id: I46685e7985cbf2c1c5b1b74ef3cd3a70b920feba
GitHub-Last-Rev: 8a5704c2ecc3f8a007c00c7adcd637e56d99106c
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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.
Change-Id: I75ed748710cae7fa99f4ea6ea117ce245a4e9749
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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.
Change-Id: I9ecc748aa79c0d47fa6ff72d4ea671e917a2d5d6
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This CL updates addErrCheckAndReturn to return "if err != nil { t.Fatal(err) }"
if the conditions for such snippet completion are met.The CL allows for
the following condition:
The enclosing functions takes a type that implements testing.TB which allows
for tests, benchmarks and extensions to the testing object to be completed.
Also, this CL doesn't explicitly check for the Test/Benchmark function
signature so that test helpers can also get the same benefits.
The remaining conditions for the current "if err != nil" checks also apply.
In the future, more testing completions UX can be added.
Fixesgolang/go#43310
Change-Id: I45197ab25610e31fef629394c79cb3792b532e7d
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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.
Change-Id: Iba22c0980c09e99b454ce9e22813cc3a1f94a90c
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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.
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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.
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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
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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
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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).
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Previously struct fields completions are ordered alphabetically.
Now it is ordered by its order in definition.
Fixesgolang/go#42626
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It felt a little redundant to have completion duplicated in the file
names. Happy to revert if you prefer it the original way.
Change-Id: Ibf14a739688d48ecce0b86154b3cbe4807b2f8b1
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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
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Noticed these when I enabled the "unusedparams" analyzer. Not really
necessary to fix most of them, but seemed harmless.
Change-Id: I77c6e5f7c79f1abb701cd3332642486c34049736
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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
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Workspace packages seem to contain an empty package name when no
package is present, we can just ignore it since it leads to an
irrelevant completion suggestion.
Fixesgolang/go#41746
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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
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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
Reviewed-on: https://go-review.googlesource.com/c/tools/+/257974
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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
Reviewed-on: https://go-review.googlesource.com/c/tools/+/257969
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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
Reviewed-on: https://go-review.googlesource.com/c/tools/+/255837
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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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I have no idea what I did to trigger this, but I got a panic in this
codepath. Since this is for completion, it should be OK to simply make
this code defensive, without fully understanding the cause.
Here's the panic:
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x28 pc=0xc570f3]
goroutine 5914644 [running]:
golang.org/x/tools/internal/lsp/source/completion.(*completer).addFieldItems(0xc0996ee240, 0x1032020, 0xc0dd21e2a0, 0xc0b99b26f0)
/usr/local/google/home/rfindley/src/tools/internal/lsp/source/completion/completion.go:1065 +0x193
Change-Id: I82350b30172ead95b6611962c2e040cc49259dc2
Reviewed-on: https://go-review.googlesource.com/c/tools/+/254697
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gopls has many settings. We want to automatically generate
documentation, and we want to allow clients to perform their own
validation if they so desire.
Using all three of AST, type information, and reflection, generate a
JSON description of the settings and their default values. Add a gopls
command that prints it. Add a documentation generator that uses it to
write settings.md.
I assumed that everything not explicitly documented was experimental,
and moved it into that section. I also moved expandWorkspaceToModule to
experimental; I hope it's not long for this world, personally.
Along the way, rename many fields, make the enum matching case
insensitive, and add a stringer call so that the defaults print nicely.
Fixesgolang/go#33544.
Change-Id: Ibb652002933e355ed3c6038d6ca48345b39b3025
Reviewed-on: https://go-review.googlesource.com/c/tools/+/252322
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This change adds one more test for package completions (and slightly
modifies the way we pass in file content without a terminal newline).
Also, a few tiny modifications to the package completion code.
Change-Id: I3041b5ad648873881b2b8df17df6f78fbd1898e5
Reviewed-on: https://go-review.googlesource.com/c/tools/+/253177
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Completion is slowly becoming a large part of internal/lsp/source and it
makes sense to move to its own seperate package inside source to make
future refactors easier. As a part of this change, any unexported
members from source required by completion are now exported. Util
functions only required by completion are moved from
internal/lsp/source/util.go to internal/lsp/source/completion/util.go.
Change-Id: I6b7405ec598c910545e649bb0e6aa02ffa653b38
Reviewed-on: https://go-review.googlesource.com/c/tools/+/253178
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Heschi Kreinick
Rob Findley
Muir Manders
pjw
Shoshin Nikita
Marwan Sulaiman
Matheus Alcantara
Rebecca Stambler
Chiawen Chen
Danish Dua
phillc