### Complete Go LSP Server Example

Source: https://context7.com/modern-dev/go-lsp/llms.txt

A comprehensive Go example demonstrating the setup of a Language Server Protocol (LSP) server. It includes bidirectional communication logic suitable for testing via net.Pipe or for production environments using stdio.

```go
package main

import (
    "context"
    "fmt"
    "net"
    "os"

    "github.com/modern-dev/go-lsp/protocol"
    "go.lsp.dev/jsonrpc2"
)

type completeServer struct {
    client    protocol.Client
    documents map[protocol.DocumentURI]string
}

func newCompleteServer() *completeServer {
    return &completeServer{documents: make(map[protocol.DocumentURI]string)}
}

func (s *completeServer) Initialize(ctx context.Context, params *protocol.InitializeParams) (*protocol.InitializeResult, error) {
    return &protocol.InitializeResult{
        Capabilities: protocol.ServerCapabilities{
            TextDocumentSync: &protocol.TextDocumentSyncOptions{
                OpenClose: new(true),
                Change:    new(protocol.TextDocumentSyncKindFull),
                Save:      &protocol.SaveOptions{IncludeText: new(true)},
            },
            HoverProvider:          true,
            CompletionProvider:     &protocol.CompletionOptions{TriggerCharacters: []string{".", ":"}},
            DefinitionProvider:     true,
            ReferencesProvider:     true,
            DocumentSymbolProvider: true,
            WorkspaceSymbolProvider: true,
            CodeActionProvider:     true,
            RenameProvider:         &protocol.RenameOptions{PrepareProvider: new(true)},
        },
        ServerInfo: &protocol.ServerInfo{Name: "complete-server", Version: new("1.0.0")},
    }, nil
}

func (s *completeServer) Initialized(ctx context.Context, params *protocol.InitializedParams) error {
    // Server can now send requests to client
    if s.client != nil {
        _ = s.client.LogMessage(ctx, &protocol.LogMessageParams{
            Type:    protocol.MessageTypeInfo,
            Message: "Server initialized successfully",
        })
    }
    return nil
}

func (s *completeServer) DidOpen(ctx context.Context, params *protocol.DidOpenTextDocumentParams) error {
    s.documents[params.TextDocument.URI] = params.TextDocument.Text
    // Analyze and publish diagnostics
    if s.client != nil {
        _ = s.client.PublishDiagnostics(ctx, &protocol.PublishDiagnosticsParams{
            URI:         params.TextDocument.URI,
            Diagnostics: []protocol.Diagnostic{}, // Empty = no errors
        })
    }
    return nil
}

// For stdio communication (production)
func runStdio() {
    server := newCompleteServer()
    handler := protocol.ServerHandler(server, nil)

    stream := jsonrpc2.NewStream(os.Stdin, os.Stdout)
    conn := jsonrpc2.NewConn(stream)

    // Set up client dispatcher for server-to-client messages
    server.client = protocol.ClientDispatcher(conn, nil)

    conn.Go(context.Background(), handler)
    <-conn.Done()
}

// For testing with net.Pipe
func runTest() {
    server := newCompleteServer()
    handler := protocol.ServerHandler(server, nil)

    clientConn, serverConn := net.Pipe()

    serverStream := jsonrpc2.NewStream(serverConn)
    sConn := jsonrpc2.NewConn(serverStream)
    server.client = protocol.ClientDispatcher(sConn, nil)
    sConn.Go(context.Background(), handler)

    clientStream := jsonrpc2.NewStream(clientConn)
    cConn := jsonrpc2.NewConn(clientStream)
    cConn.Go(context.Background(), jsonrpc2.MethodNotFoundHandler)

    // Client can now send requests
    ctx := context.Background()
    var result protocol.InitializeResult
    _, _ = cConn.Call(ctx, "initialize", protocol.InitializeParams{
        ProcessId:    new(int32),
        RootURI:      "file:///workspace",
        Capabilities: protocol.ClientCapabilities{},
    }, &result)

    fmt.Printf("Server: %s v%s\n", result.ServerInfo.Name, *result.ServerInfo.Version)

    // Cleanup
    _ = cConn.Close()
    _ = sConn.Close()
}

```

--------------------------------

### Install go-lsp dependency

Source: https://github.com/modern-dev/go-lsp/blob/main/README.md

Use the go get command to add the library to your Go project.

```bash
go get github.com/modern-dev/go-lsp@latest
```

--------------------------------

### Implement LSP Server in Go

Source: https://github.com/modern-dev/go-lsp/blob/main/README.md

Shows how to implement the Server interface and initialize a connection using the ServerHandler. This example demonstrates handling Initialize and Hover requests.

```go
package main

import (
    "context"
    "os"

    "github.com/modern-dev/go-lsp/protocol"
    "go.lsp.dev/jsonrpc2"
)

type myServer struct {}

func (s *myServer) Initialize(ctx context.Context, params *protocol.InitializeParams) (*protocol.InitializeResult, error) {
    return &protocol.InitializeResult{
        Capabilities: protocol.ServerCapabilities{
            HoverProvider: true,
        },
        ServerInfo: &protocol.ServerInfo{Name: "my-server"},
    }, nil
}

func (s *myServer) Hover(ctx context.Context, params *protocol.HoverParams) (*protocol.Hover, error) {
    return &protocol.Hover{
        Contents: protocol.MarkupContent{
            Kind:  protocol.MarkupKindMarkdown,
            Value: "Hello from **my-server**!",
        },
    }, nil
}

func main() {
    server := &myServer{}
    handler := protocol.ServerHandler(server, nil)

    stream := jsonrpc2.NewStream(os.Stdin, os.Stdout)
    conn := jsonrpc2.NewConn(stream)
    conn.Go(context.Background(), handler)
    <-conn.Done()
}
```

--------------------------------

### Implement LSP Server with ServerHandler

Source: https://context7.com/modern-dev/go-lsp/llms.txt

Demonstrates how to implement the Server interface and use ServerHandler to dispatch JSON-RPC requests. This setup connects the server to standard input/output for communication with an LSP client.

```go
package main

import (
    "context"
    "os"

    "github.com/modern-dev/go-lsp/protocol"
    "go.lsp.dev/jsonrpc2"
)

type myServer struct{}

func (s *myServer) Initialize(ctx context.Context, params *protocol.InitializeParams) (*protocol.InitializeResult, error) {
    return &protocol.InitializeResult{
        Capabilities: protocol.ServerCapabilities{
            HoverProvider:      true,
            DefinitionProvider: true,
            CompletionProvider: &protocol.CompletionOptions{},
            TextDocumentSync: &protocol.TextDocumentSyncOptions{
                OpenClose: new(true),
                Change:    new(protocol.TextDocumentSyncKindFull),
            },
        },
        ServerInfo: &protocol.ServerInfo{Name: "my-server", Version: new("1.0.0")},
    }, nil
}

func main() {
    server := &myServer{}
    handler := protocol.ServerHandler(server, nil)

    stream := jsonrpc2.NewStream(os.Stdin, os.Stdout)
    conn := jsonrpc2.NewConn(stream)
    conn.Go(context.Background(), handler)
    <-conn.Done()
}
```

--------------------------------

### Implement Logger Interface for LSP in Go

Source: https://context7.com/modern-dev/go-lsp/llms.txt

Shows how to use the `Logger` interface for leveled logging within the protocol package. It includes an example of disabling logging with `NopLogger` and implementing a custom logger compatible with zap-style logging without requiring the zap dependency.

```go
package main

import (
    "fmt"

    "github.com/modern-dev/go-lsp/protocol"
)

// Custom logger implementation
type customLogger struct{}

func (l *customLogger) Debug(msg string, fields ...any) {
    fmt.Printf("[DEBUG] %s %v\n", msg, fields)
}

func (l *customLogger) Info(msg string, fields ...any) {
    fmt.Printf("[INFO] %s %v\n", msg, fields)
}

func (l *customLogger) Warn(msg string, fields ...any) {
    fmt.Printf("[WARN] %s %v\n", msg, fields)
}

func (l *customLogger) Error(msg string, fields ...any) {
    fmt.Printf("[ERROR] %s %v\n", msg, fields)
}

func loggerExample() {
    // Use NopLogger to disable all logging
    nopLogger := protocol.NopLogger()
    handler := protocol.ServerHandler(&myServer{}, nopLogger)

    // Use custom logger for debugging
    customLog := &customLogger{}
    handlerWithLogging := protocol.ServerHandler(&myServer{}, customLog)

    _, _ = handler, handlerWithLogging
}

type myServer struct{}
// ... implement Server interface ...

```

--------------------------------

### Implement LSP Server Interface in Go

Source: https://context7.com/modern-dev/go-lsp/llms.txt

Demonstrates how to implement the Server interface to handle lifecycle events and document operations. It shows initialization, document tracking, and hover request handling.

```go
package main

import (
    "context"
    "fmt"

    "github.com/modern-dev/go-lsp/protocol"
)

type languageServer struct {
    documents map[protocol.DocumentURI]string
}

func newLanguageServer() *languageServer {
    return &languageServer{documents: make(map[protocol.DocumentURI]string)}
}

func (s *languageServer) Initialize(ctx context.Context, params *protocol.InitializeParams) (*protocol.InitializeResult, error) {
    return &protocol.InitializeResult{
        Capabilities: protocol.ServerCapabilities{
            HoverProvider:          true,
            DefinitionProvider:     true,
            DocumentSymbolProvider: true,
            CompletionProvider:     &protocol.CompletionOptions{TriggerCharacters: []string{"."}},
        },
        ServerInfo: &protocol.ServerInfo{Name: "example-lsp"},
    }, nil
}

func (s *languageServer) DidOpen(ctx context.Context, params *protocol.DidOpenTextDocumentParams) error {
    s.documents[params.TextDocument.URI] = params.TextDocument.Text
    return nil
}

func (s *languageServer) Hover(ctx context.Context, params *protocol.HoverParams) (*protocol.Hover, error) {
    text, ok := s.documents[params.TextDocument.URI]
    if !ok {
        return nil, nil
    }
    return &protocol.Hover{
        Contents: protocol.MarkupContent{
            Kind:  protocol.MarkupKindMarkdown,
            Value: fmt.Sprintf("**Line %d, Character %d**\n\n```\n%s\n```", params.Position.Line, params.Position.Character, text),
        },
    }, nil
}
```

--------------------------------

### Migrate to go-lsp/protocol Compatibility Layer in Go

Source: https://context7.com/modern-dev/go-lsp/llms.txt

Demonstrates how to use the compatibility layer for seamless migration from 'go.lsp.dev/protocol'. By changing the import path to 'github.com/modern-dev/go-lsp/protocol', existing code continues to work due to type and constant aliases. This includes aliases for server capabilities, markup kinds, code action kinds, and folding range kinds.

```go
package main

import (
    // Change this import:
    // "go.lsp.dev/protocol"
    // To this:
    "github.com/modern-dev/go-lsp/protocol"
)

func compatibilityExample() {
    // Type aliases work the same
    var wsCapabilities protocol.ServerCapabilitiesWorkspace
    var folderCaps protocol.ServerCapabilitiesWorkspaceFolders
    var fileOps protocol.ServerCapabilitiesWorkspaceFileOperations

    // Short-form constants are available
    _ = protocol.PlainText  // alias for protocol.MarkupKindPlainText
    _ = protocol.Markdown   // alias for protocol.MarkupKindMarkdown

    // Code action kinds
    _ = protocol.QuickFix              // alias for protocol.CodeActionKindQuickFix
    _ = protocol.SourceOrganizeImports // alias for protocol.CodeActionKindSourceOrganizeImports

    // Folding range kinds
    _ = protocol.CommentFoldingRange // alias for protocol.FoldingRangeKindComment
    _ = protocol.ImportsFoldingRange // alias for protocol.FoldingRangeKindImports
    _ = protocol.RegionFoldingRange  // alias for protocol.FoldingRangeKindRegion

    // ContentChangeEvent for incremental document changes
    change := protocol.ContentChangeEvent{
        Range: &protocol.Range{
            Start: protocol.Position{Line: 5, Character: 0},
            End:   protocol.Position{Line: 5, Character: 10},
        },
        RangeLength: 10,
        Text:        "new text",
    }

    _, _, _, _ = wsCapabilities, folderCaps, fileOps, change
}
```

--------------------------------

### Initialize Semantic Token Provider in Go

Source: https://context7.com/modern-dev/go-lsp/llms.txt

Implements the Initialize method for a semantic token provider in Go. It configures the server capabilities, including the legend for semantic token types and modifiers, and enables full and range semantic token requests. Dependencies include the 'context' package and the 'github.com/modern-dev/go-lsp/protocol' package.

```go
package main

import (
    "context"

    "github.com/modern-dev/go-lsp/protocol"
)

type semanticServer struct{}

func (s *semanticServer) Initialize(ctx context.Context, params *protocol.InitializeParams) (*protocol.InitializeResult, error) {
    return &protocol.InitializeResult{
        Capabilities: protocol.ServerCapabilities{
            SemanticTokensProvider: &protocol.SemanticTokensOptions{
                Legend: protocol.SemanticTokensLegend{
                    TokenTypes: []string{
                        string(protocol.SemanticTokenNamespace),  // compat alias
                        string(protocol.SemanticTokenType),
                        string(protocol.SemanticTokenClass),
                        string(protocol.SemanticTokenFunction),
                        string(protocol.SemanticTokenMethod),
                        string(protocol.SemanticTokenVariable),
                        string(protocol.SemanticTokenParameter),
                        string(protocol.SemanticTokenKeyword),
                        string(protocol.SemanticTokenString),
                        string(protocol.SemanticTokenNumber),
                        string(protocol.SemanticTokenComment),
                    },
                    TokenModifiers: []string{
                        string(protocol.SemanticTokenModifierDeclaration),
                        string(protocol.SemanticTokenModifierDefinition),
                        string(protocol.SemanticTokenModifierReadonly),
                        string(protocol.SemanticTokenModifierStatic),
                        string(protocol.SemanticTokenModifierDeprecated),
                    },
                },
                Full:  new(true),
                Range: new(true),
            },
        },
    }, nil
}
```

--------------------------------

### Migrate import path

Source: https://github.com/modern-dev/go-lsp/blob/main/README.md

Demonstrates the diff for migrating from the deprecated go.lsp.dev/protocol package to the modern-dev/go-lsp package.

```diff
- "go.lsp.dev/protocol"
+ "github.com/modern-dev/go-lsp/protocol"
```

--------------------------------

### Convert File Path to Document URI in Go

Source: https://context7.com/modern-dev/go-lsp/llms.txt

Demonstrates the usage of `URIFromPath` to create a `DocumentURI` from a filesystem path. It handles platform-specific path separators and shows how to convert a URI back to a path and check if it's a file URI.

```go
package main

import (
    "fmt"

    "github.com/modern-dev/go-lsp/protocol"
)

func documentURIExample() {
    // Create URI from filesystem path (Unix)
    uri := protocol.URIFromPath("/home/user/project/main.go")
    fmt.Println(uri) // Output: file:///home/user/project/main.go

    // Create URI from filesystem path (Windows)
    windowsURI := protocol.URIFromPath("C:\\Users\\user\\project\\main.go")
    fmt.Println(windowsURI) // Output: file:///C:/Users/user/project/main.go

    // Convert URI back to filesystem path
    path := uri.Path()
    fmt.Println(path) // Output: /home/user/project/main.go

    // Check if URI is a file URI
    isFile := uri.IsFile()
    fmt.Println(isFile) // Output: true

    // Filename is an alias for Path
    filename := uri.Filename()
    fmt.Println(filename) // Output: /home/user/project/main.go
}
```

--------------------------------

### Dispatch Client Notifications in Go

Source: https://context7.com/modern-dev/go-lsp/llms.txt

Shows how to use the ClientDispatcher to send notifications such as diagnostics, messages, and logs from the server to the client over a JSON-RPC connection.

```go
func serverWithClientNotifications() {
    clientConn, serverConn := net.Pipe()
    serverStream := jsonrpc2.NewStream(serverConn)
    sConn := jsonrpc2.NewConn(serverStream)

    client := protocol.ClientDispatcher(sConn, nil)

    ctx := context.Background()
    err := client.PublishDiagnostics(ctx, &protocol.PublishDiagnosticsParams{
        URI: "file:///workspace/main.go",
        Diagnostics: []protocol.Diagnostic{
            {
                Range: protocol.Range{
                    Start: protocol.Position{Line: 10, Character: 0},
                    End:   protocol.Position{Line: 10, Character: 15},
                },
                Message: "undefined: someVariable",
            },
        },
    })
    
    err = client.ShowMessage(ctx, &protocol.ShowMessageParams{
        Type:    protocol.MessageTypeInfo,
        Message: "Language server initialized successfully",
    })
}
```

--------------------------------

### Implement Completion Method in Go LSP

Source: https://context7.com/modern-dev/go-lsp/llms.txt

This implementation of the Completion method extracts the current line of text from the document, filters a predefined set of completion items based on the user's input prefix, and returns a CompletionList. It utilizes the protocol package to define completion items with labels, kinds, and snippet-based insert text.

```go
func (s *completionServer) Completion(ctx context.Context, params *protocol.CompletionParams) (any, error) {
	text, ok := s.documents[params.TextDocument.URI]
	if !ok {
		return nil, nil
	}

	// Get the line being edited
	lines := strings.Split(text, "\n")
	if int(params.Position.Line) >= len(lines) {
		return nil, nil
	}
	line := lines[params.Position.Line]
	prefix := line[:params.Position.Character]

	// Build completion items based on context
	items := []protocol.CompletionItem{
		{
			Label:         "fmt.Println",
			Kind:          new(protocol.CompletionItemKindFunction),
			Detail:        new("func(a ...any) (n int, err error)"),
			Documentation: "Println formats using default formats and writes to standard output.",
			InsertText:    new("fmt.Println($0)"),
			InsertTextFormat: new(protocol.InsertTextFormatSnippet),
		},
		{
			Label:  "for",
			Kind:   new(protocol.CompletionItemKindKeyword),
			Detail: new("for loop"),
			InsertText: new("for ${1:i} := ${2:0}; $1 < ${3:n}; $1++ {\n\t$0\n}"),
			InsertTextFormat: new(protocol.InsertTextFormatSnippet),
		},
		{
			Label:  "func",
			Kind:   new(protocol.CompletionItemKindKeyword),
			Detail: new("function declaration"),
			InsertText: new("func ${1:name}(${2:params}) ${3:returnType} {\n\t$0\n}"),
			InsertTextFormat: new(protocol.InsertTextFormatSnippet),
		},
	}

	// Filter based on prefix
	var filtered []protocol.CompletionItem
	for _, item := range items {
		if strings.HasPrefix(strings.ToLower(item.Label), strings.ToLower(strings.TrimSpace(prefix))) {
			filtered = append(filtered, item)
		}
	}

	return &protocol.CompletionList{
		IsIncomplete: false,
		Items:        filtered,
	}, nil
}
```

--------------------------------

### Run code generation

Source: https://github.com/modern-dev/go-lsp/blob/main/README.md

Commands to trigger the code generator to update types from the LSP specification.

```bash
# Re-generate from the default spec ref
go generate ./protocol/...

# Or run the generator directly
go run ./cmd/generate -o ./protocol
```

--------------------------------

### Implement DocumentSymbol for Go LSP

Source: https://context7.com/modern-dev/go-lsp/llms.txt

This Go code snippet demonstrates the implementation of the `DocumentSymbol` method. It takes context and document symbol parameters and returns hierarchical document symbols, including functions, variables, structs, and fields. This functionality is essential for features like 'Go to Symbol' in IDEs.

```go
package main

import (
    "context"

    "github.com/modern-dev/go-lsp/protocol"
)

type symbolServer struct{}

func (s *symbolServer) DocumentSymbol(ctx context.Context, params *protocol.DocumentSymbolParams) (any, error) {
    // Return hierarchical document symbols
    symbols := []protocol.DocumentSymbol{
        {
            Name:   "main",
            Kind:   protocol.SymbolKindFunction,
            Detail: new("func()") ,
            Range: protocol.Range{
                Start: protocol.Position{Line: 5, Character: 0},
                End:   protocol.Position{Line: 15, Character: 1},
            },
            SelectionRange: protocol.Range{
                Start: protocol.Position{Line: 5, Character: 5},
                End:   protocol.Position{Line: 5, Character: 9},
            },
            Children: []protocol.DocumentSymbol{
                {
                    Name: "server",
                    Kind: protocol.SymbolKindVariable,
                    Range: protocol.Range{
                        Start: protocol.Position{Line: 6, Character: 1},
                        End:   protocol.Position{Line: 6, Character: 30},
                    },
                    SelectionRange: protocol.Range{
                        Start: protocol.Position{Line: 6, Character: 1},
                        End:   protocol.Position{Line: 6, Character: 7},
                    },
                },
            },
        },
        {
            Name:   "MyStruct",
            Kind:   protocol.SymbolKindStruct,
            Detail: new("type") ,
            Range: protocol.Range{
                Start: protocol.Position{Line: 17, Character: 0},
                End:   protocol.Position{Line: 22, Character: 1},
            },
            SelectionRange: protocol.Range{
                Start: protocol.Position{Line: 17, Character: 5},
                End:   protocol.Position{Line: 17, Character: 13},
            },
            Children: []protocol.DocumentSymbol{
                {
                    Name: "Name",
                    Kind: protocol.SymbolKindField,
                    Range: protocol.Range{
                        Start: protocol.Position{Line: 18, Character: 1},
                        End:   protocol.Position{Line: 18, Character: 12},
                    },
                    SelectionRange: protocol.Range{
                        Start: protocol.Position{Line: 18, Character: 1},
                        End:   protocol.Position{Line: 18, Character: 5},
                    },
                },
            },
        },
    }

    return symbols, nil
}

```

--------------------------------

### Update LSP Version using go run

Source: https://context7.com/modern-dev/go-lsp/llms.txt

This command updates the LSP protocol definitions by running a Go script. It takes a Git reference for the protocol version and an output directory for the generated files. The `-model` flag can optionally specify a local metaModel.json file.

```bash
go run ./cmd/generate -ref release/protocol/3.18.0 -o ./protocol
```

--------------------------------

### LSP Server Interface

Source: https://context7.com/modern-dev/go-lsp/llms.txt

The Server interface defines the core LSP methods for handling lifecycle, document synchronization, and language features.

```APIDOC
## [LSP] Initialize

### Description
Initializes the language server, defining capabilities and server information.

### Method
RPC/Method Call

### Endpoint
initialize

### Parameters
#### Request Body
- **params** (InitializeParams) - Required - The initialization parameters including capabilities and root URI.

### Request Example
{
  "processId": 1234,
  "rootUri": "file:///workspace"
}

### Response
#### Success Response (200)
- **capabilities** (ServerCapabilities) - The capabilities the server provides.
- **serverInfo** (ServerInfo) - Information about the server.

#### Response Example
{
  "capabilities": { "hoverProvider": true, "definitionProvider": true },
  "serverInfo": { "name": "example-lsp" }
}
```

--------------------------------

### Utilize LSP Error Codes for Server Responses in Go

Source: https://context7.com/modern-dev/go-lsp/llms.txt

Illustrates the use of standard LSP error codes, which extend JSON-RPC error codes, for returning errors from server methods. This ensures proper error semantics are communicated to clients, covering scenarios like server initialization status and request cancellation.

```go
package main

import (
    "context"
    "fmt"

    "github.com/modern-dev/go-lsp/protocol"
)

// LSP Error Codes:
// protocol.CodeServerNotInitialized (-32002) - Request before initialize
// protocol.CodeInvalidRequest       (-32600) - Invalid request in current state
// protocol.CodeMethodNotFound       (-32601) - Method not supported
// protocol.CodeInvalidParams        (-32602) - Invalid parameters
// protocol.CodeInternalError        (-32603) - Internal server error
// protocol.CodeParseError           (-32700) - JSON parsing failed
// protocol.CodeRequestCancelled     (-32800) - Client cancelled request
// protocol.CodeContentModified      (-32801) - Content modified during request

type serverWithErrorHandling struct {
    initialized bool
}

func (s *serverWithErrorHandling) Definition(ctx context.Context, params *protocol.DefinitionParams) (any, error) {
    if !s.initialized {
        return nil, fmt.Errorf("server not initialized (code: %d)", protocol.CodeServerNotInitialized)
    }

    // Check for cancelled context
    select {
    case <-ctx.Done():
        return nil, fmt.Errorf("request cancelled (code: %d)", protocol.CodeRequestCancelled)
    default:
    }

    // Return definition location
    return &protocol.Location{
        URI: params.TextDocument.URI,
        Range: protocol.Range{
            Start: protocol.Position{Line: 0, Character: 0},
            End:   protocol.Position{Line: 0, Character: 10},
        },
    }, nil
}

```

--------------------------------

### Generate LSP Protocol Code in Bash

Source: https://context7.com/modern-dev/go-lsp/llms.txt

Commands to regenerate Go source files for the LSP protocol using the code generator. It reads Microsoft's 'metaModel.json' specification to produce 'types_gen.go', 'server_gen.go', and 'client_gen.go'. This allows updating to new LSP versions or customizing generated code.

```bash
# Re-generate from the default spec ref (LSP 3.17)
go generate ./protocol/...

# Run the generator directly
go run ./cmd/generate -o ./protocol

# Use a local metaModel.json file
go run ./cmd/generate -o ./protocol -model ./path/to/metaModel.json
```

--------------------------------

### Provide Full Semantic Tokens in Go

Source: https://context7.com/modern-dev/go-lsp/llms.txt

Implements the SemanticTokensFull method to return encoded semantic tokens for a given context and parameters. Each token is represented by five integers: deltaLine, deltaStartChar, length, tokenType, and tokenModifiers. This function is crucial for rich syntax highlighting in LSP clients.

```go
func (s *semanticServer) SemanticTokensFull(ctx context.Context, params *protocol.SemanticTokensParams) (*protocol.SemanticTokens, error) {
    // Return encoded semantic tokens
    // Each token is encoded as 5 integers: deltaLine, deltaStartChar, length, tokenType, tokenModifiers
    return &protocol.SemanticTokens{
        Data: []uint32{
            0, 0, 7, 7, 0,   // "package" keyword at line 0, char 0, length 7, type=keyword(7)
            0, 8, 4, 0, 1,   // "main" namespace at line 0, char 8, length 4, type=namespace(0), modifier=declaration(1)
            2, 0, 4, 7, 0,   // "func" keyword at line 2, char 0
            0, 5, 4, 3, 1,   // "main" function at line 2, char 5, type=function(3), modifier=declaration
        },
    }, nil
}
```

--------------------------------

### ClientDispatcher Notifications

Source: https://context7.com/modern-dev/go-lsp/llms.txt

The ClientDispatcher allows the server to send notifications and requests back to the client, such as diagnostic updates or status messages.

```APIDOC
## [LSP] PublishDiagnostics

### Description
Sends diagnostic information (errors, warnings) to the client for a specific file.

### Method
RPC/Notification

### Endpoint
textDocument/publishDiagnostics

### Parameters
#### Request Body
- **uri** (DocumentURI) - Required - The URI of the document.
- **diagnostics** (Diagnostic[]) - Required - The list of diagnostics to report.

### Request Example
{
  "uri": "file:///workspace/main.go",
  "diagnostics": [{ "range": { "start": { "line": 10 }, "end": { "line": 10 } }, "message": "undefined variable" }]
}

### Response
#### Success Response (200)
- None (Notification only)
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.