internal/lsp: add outgoing calls call hierarchy

* Adds outgoing calls call hierarchy for function declarations to gopls. Returns all call ranges and call items for functions/literals being called.
* Adds tests for outgoing call.
* Updates cmd to account for call ranges and call items being in different files for outgoing calls.
* Updates prepare call hierarchy to return declaration as root instead of cursor position.

Example:
Example shows https://github.com/golang/tools/blob/master/internal/lsp/source/call_hierarchy.go

Show Call Hierarchy View: https://imgur.com/a/DA5vc6l
Peek Call Hierarchy View: https://imgur.com/a/fuiG0Be

Note:
* While incoming calls for a function defined in an interface return references to that function, outgoing calls don't return anything since we don't know what implementation to return outgoing calls for.* Outgoing calls to function literals show as variable name used to define the literal, compared to <scope>.func() for incoming calls.

Change-Id: Ib8afbd8617675d12952db0b80170ada5988e90ab
Reviewed-on: https://go-review.googlesource.com/c/tools/+/248537
Run-TryBot: Danish Dua <danishdua@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
9 files changed
tree: ea694ef4e2ec4118db32cd2053464fa57623be1e
  1. benchmark/
  2. blog/
  3. cmd/
  4. container/
  5. cover/
  6. go/
  7. godoc/
  8. gopls/
  9. imports/
  10. internal/
  11. playground/
  12. present/
  13. refactor/
  14. txtar/
  15. .gitattributes
  16. .gitignore
  17. .prettierrc
  18. AUTHORS
  19. codereview.cfg
  20. CONTRIBUTING.md
  21. CONTRIBUTORS
  22. go.mod
  23. go.sum
  24. LICENSE
  25. PATENTS
  26. README.md
README.md

Go Tools

This subrepository holds the source for various packages and tools that support the Go programming language.

Some of the tools, godoc and vet for example, are included in binary Go distributions.

Others, including the Go guru and the test coverage tool, can be fetched with go get.

Packages include a type-checker for Go and an implementation of the Static Single Assignment form (SSA) representation for Go programs.

Download/Install

The easiest way to install is to run go get -u golang.org/x/tools/.... You can also manually git clone the repository to $GOPATH/src/golang.org/x/tools.

JS/CSS Formatting

This repository uses prettier to format JS and CSS files.

The version of prettier used is 1.18.2.

It is encouraged that all JS and CSS code be run through this before submitting a change. However, it is not a strict requirement enforced by CI.

Report Issues / Send Patches

This repository uses Gerrit for code changes. To learn how to submit changes to this repository, see https://golang.org/doc/contribute.html.

The main issue tracker for the tools repository is located at https://github.com/golang/go/issues. Prefix your issue with “x/tools/(your subdir):” in the subject line, so it is easy to find.