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main.go
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main.go
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package main
import (
"bufio"
"educationalsp/analysis"
"educationalsp/lsp"
"educationalsp/rpc"
"encoding/json"
"io"
"log"
"os"
)
func main() {
logger := getLogger("/home/tjdevries/git/educationalsp/log.txt")
logger.Println("Hey, I started!")
scanner := bufio.NewScanner(os.Stdin)
scanner.Split(rpc.Split)
state := analysis.NewState()
writer := os.Stdout
for scanner.Scan() {
msg := scanner.Bytes()
method, contents, err := rpc.DecodeMessage(msg)
if err != nil {
logger.Printf("Got an error: %s", err)
continue
}
handleMessage(logger, writer, state, method, contents)
}
}
func handleMessage(logger *log.Logger, writer io.Writer, state analysis.State, method string, contents []byte) {
logger.Printf("Received msg with method: %s", method)
switch method {
case "initialize":
var request lsp.InitializeRequest
if err := json.Unmarshal(contents, &request); err != nil {
logger.Printf("Hey, we couldn't parse this: %s", err)
}
logger.Printf("Connected to: %s %s",
request.Params.ClientInfo.Name,
request.Params.ClientInfo.Version)
// hey... let's reply!
msg := lsp.NewInitializeResponse(request.ID)
writeResponse(writer, msg)
logger.Print("Sent the reply")
case "textDocument/didOpen":
var request lsp.DidOpenTextDocumentNotification
if err := json.Unmarshal(contents, &request); err != nil {
logger.Printf("textDocument/didOpen: %s", err)
return
}
logger.Printf("Opened: %s", request.Params.TextDocument.URI)
diagnostics := state.OpenDocument(request.Params.TextDocument.URI, request.Params.TextDocument.Text)
writeResponse(writer, lsp.PublishDiagnosticsNotification{
Notification: lsp.Notification{
RPC: "2.0",
Method: "textDocument/publishDiagnostics",
},
Params: lsp.PublishDiagnosticsParams{
URI: request.Params.TextDocument.URI,
Diagnostics: diagnostics,
},
})
case "textDocument/didChange":
var request lsp.TextDocumentDidChangeNotification
if err := json.Unmarshal(contents, &request); err != nil {
logger.Printf("textDocument/didChange: %s", err)
return
}
logger.Printf("Changed: %s", request.Params.TextDocument.URI)
for _, change := range request.Params.ContentChanges {
diagnostics := state.UpdateDocument(request.Params.TextDocument.URI, change.Text)
writeResponse(writer, lsp.PublishDiagnosticsNotification{
Notification: lsp.Notification{
RPC: "2.0",
Method: "textDocument/publishDiagnostics",
},
Params: lsp.PublishDiagnosticsParams{
URI: request.Params.TextDocument.URI,
Diagnostics: diagnostics,
},
})
}
case "textDocument/hover":
var request lsp.HoverRequest
if err := json.Unmarshal(contents, &request); err != nil {
logger.Printf("textDocument/hover: %s", err)
return
}
// Create a response
response := state.Hover(request.ID, request.Params.TextDocument.URI, request.Params.Position)
// Write it back
writeResponse(writer, response)
case "textDocument/definition":
var request lsp.DefinitionRequest
if err := json.Unmarshal(contents, &request); err != nil {
logger.Printf("textDocument/definition: %s", err)
return
}
// Create a response
response := state.Definition(request.ID, request.Params.TextDocument.URI, request.Params.Position)
// Write it back
writeResponse(writer, response)
case "textDocument/codeAction":
var request lsp.CodeActionRequest
if err := json.Unmarshal(contents, &request); err != nil {
logger.Printf("textDocument/codeAction: %s", err)
return
}
// Create a response
response := state.TextDocumentCodeAction(request.ID, request.Params.TextDocument.URI)
// Write it back
writeResponse(writer, response)
case "textDocument/completion":
var request lsp.CompletionRequest
if err := json.Unmarshal(contents, &request); err != nil {
logger.Printf("textDocument/codeAction: %s", err)
return
}
// Create a response
response := state.TextDocumentCompletion(request.ID, request.Params.TextDocument.URI)
// Write it back
writeResponse(writer, response)
}
}
func writeResponse(writer io.Writer, msg any) {
reply := rpc.EncodeMessage(msg)
writer.Write([]byte(reply))
}
func getLogger(filename string) *log.Logger {
logfile, err := os.OpenFile(filename, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
if err != nil {
panic("hey, you didnt give me a good file")
}
return log.New(logfile, "[educationalsp]", log.Ldate|log.Ltime|log.Lshortfile)
}