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general.go
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general.go
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// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package lsp
import (
"context"
"fmt"
"go/ast"
"go/parser"
"go/token"
"os"
"path"
"strings"
"golang.org/x/tools/go/packages"
"golang.org/x/tools/internal/jsonrpc2"
"golang.org/x/tools/internal/lsp/cache"
"golang.org/x/tools/internal/lsp/protocol"
"golang.org/x/tools/internal/span"
)
func (s *Server) initialize(ctx context.Context, params *protocol.InitializeParams) (*protocol.InitializeResult, error) {
s.initializedMu.Lock()
defer s.initializedMu.Unlock()
if s.isInitialized {
return nil, jsonrpc2.NewErrorf(jsonrpc2.CodeInvalidRequest, "server already initialized")
}
s.isInitialized = true // mark server as initialized now
// TODO(rstambler): Change this default to protocol.Incremental (or add a
// flag). Disabled for now to simplify debugging.
s.textDocumentSyncKind = protocol.Full
s.setClientCapabilities(params.Capabilities)
// We need a "detached" context so it does not get timeout cancelled.
// TODO(iancottrell): Do we need to copy any values across?
viewContext := context.Background()
folders := params.WorkspaceFolders
if len(folders) == 0 {
if params.RootURI != "" {
folders = []protocol.WorkspaceFolder{{
URI: params.RootURI,
Name: path.Base(params.RootURI),
}}
} else {
// no folders and no root, single file mode
//TODO(iancottrell): not sure how to do single file mode yet
//issue: golang.org/issue/31168
return nil, fmt.Errorf("single file mode not supported yet")
}
}
for _, folder := range folders {
uri := span.NewURI(folder.URI)
folderPath, err := uri.Filename()
if err != nil {
return nil, err
}
s.views = append(s.views, cache.NewView(viewContext, s.log, folder.Name, uri, &packages.Config{
Context: ctx,
Dir: folderPath,
Env: os.Environ(),
Mode: packages.LoadImports,
Fset: token.NewFileSet(),
Overlay: make(map[string][]byte),
ParseFile: func(fset *token.FileSet, filename string, src []byte) (*ast.File, error) {
return parser.ParseFile(fset, filename, src, parser.AllErrors|parser.ParseComments)
},
Tests: true,
}))
}
return &protocol.InitializeResult{
Capabilities: protocol.ServerCapabilities{
CodeActionProvider: true,
CompletionProvider: &protocol.CompletionOptions{
TriggerCharacters: []string{"."},
},
DefinitionProvider: true,
DocumentFormattingProvider: true,
DocumentRangeFormattingProvider: true,
DocumentSymbolProvider: true,
HoverProvider: true,
DocumentHighlightProvider: true,
SignatureHelpProvider: &protocol.SignatureHelpOptions{
TriggerCharacters: []string{"(", ","},
},
TextDocumentSync: &protocol.TextDocumentSyncOptions{
Change: s.textDocumentSyncKind,
OpenClose: true,
},
TypeDefinitionProvider: true,
},
}, nil
}
func (s *Server) setClientCapabilities(caps protocol.ClientCapabilities) {
// Check if the client supports snippets in completion items.
s.insertTextFormat = protocol.PlainTextTextFormat
if caps.TextDocument.Completion.CompletionItem.SnippetSupport {
s.insertTextFormat = protocol.SnippetTextFormat
}
// Check if the client supports configuration messages.
s.configurationSupported = caps.Workspace.Configuration
s.dynamicConfigurationSupported = caps.Workspace.DidChangeConfiguration.DynamicRegistration
// Check which types of content format are supported by this client.
s.preferredContentFormat = protocol.PlainText
if len(caps.TextDocument.Hover.ContentFormat) > 0 {
s.preferredContentFormat = caps.TextDocument.Hover.ContentFormat[0]
}
}
func (s *Server) initialized(ctx context.Context, params *protocol.InitializedParams) error {
if s.configurationSupported {
if s.dynamicConfigurationSupported {
s.client.RegisterCapability(ctx, &protocol.RegistrationParams{
Registrations: []protocol.Registration{{
ID: "workspace/didChangeConfiguration",
Method: "workspace/didChangeConfiguration",
}},
})
}
for _, view := range s.views {
config, err := s.client.Configuration(ctx, &protocol.ConfigurationParams{
Items: []protocol.ConfigurationItem{{
ScopeURI: protocol.NewURI(view.Folder),
Section: "gopls",
}},
})
if err != nil {
return err
}
if err := s.processConfig(view, config[0]); err != nil {
return err
}
}
}
return nil
}
func (s *Server) processConfig(view *cache.View, config interface{}) error {
// TODO: We should probably store and process more of the config.
if config == nil {
return nil // ignore error if you don't have a config
}
c, ok := config.(map[string]interface{})
if !ok {
return fmt.Errorf("invalid config gopls type %T", config)
}
// Get the environment for the go/packages config.
if env := c["env"]; env != nil {
menv, ok := env.(map[string]interface{})
if !ok {
return fmt.Errorf("invalid config gopls.env type %T", env)
}
for k, v := range menv {
view.Config.Env = applyEnv(view.Config.Env, k, v)
}
}
// Check if placeholders are enabled.
if usePlaceholders, ok := c["usePlaceholders"].(bool); ok {
s.usePlaceholders = usePlaceholders
}
// Check if enhancedHover is enabled.
if enhancedHover, ok := c["enhancedHover"].(bool); ok {
s.enhancedHover = enhancedHover
}
return nil
}
func applyEnv(env []string, k string, v interface{}) []string {
prefix := k + "="
value := prefix + fmt.Sprint(v)
for i, s := range env {
if strings.HasPrefix(s, prefix) {
env[i] = value
return env
}
}
return append(env, value)
}
func (s *Server) shutdown(ctx context.Context) error {
// TODO(rstambler): Cancel contexts here?
s.initializedMu.Lock()
defer s.initializedMu.Unlock()
if !s.isInitialized {
return jsonrpc2.NewErrorf(jsonrpc2.CodeInvalidRequest, "server not initialized")
}
s.isInitialized = false
return nil
}
func (s *Server) exit(ctx context.Context) error {
if s.isInitialized {
os.Exit(1)
}
os.Exit(0)
return nil
}