1 files changed, 63 insertions, 0 deletions
diff --git a/internal/lsp/transport.go b/internal/lsp/transport.go
new file mode 100644
index 0000000..671d69b
--- /dev/null
+++ b/internal/lsp/transport.go
@@ -0,0 +1,63 @@
+package lsp
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/textproto"
+	"strconv"
+	"strings"
+)
+
+func (s *Server) readMessage() ([]byte, error) {
+	tp := textproto.NewReader(s.in)
+	var contentLength int
+	for {
+		line, err := tp.ReadLine()
+		if err != nil {
+			return nil, err
+		}
+		if line == "" { // end of headers
+			break
+		}
+		parts := strings.SplitN(line, ":", 2)
+		if len(parts) != 2 {
+			continue
+		}
+		key := strings.TrimSpace(strings.ToLower(parts[0]))
+		val := strings.TrimSpace(parts[1])
+		switch key {
+		case "content-length":
+			n, err := strconv.Atoi(val)
+			if err != nil {
+				return nil, fmt.Errorf("invalid Content-Length: %v", err)
+			}
+			contentLength = n
+		}
+	}
+	if contentLength <= 0 {
+		return nil, fmt.Errorf("missing or invalid Content-Length")
+	}
+	buf := make([]byte, contentLength)
+	if _, err := io.ReadFull(s.in, buf); err != nil {
+		return nil, err
+	}
+	return buf, nil
+}
+
+func (s *Server) writeMessage(v any) {
+	data, err := json.Marshal(v)
+	if err != nil {
+		s.logger.Printf("marshal error: %v", err)
+		return
+	}
+	header := fmt.Sprintf("Content-Length: %d\r\n\r\n", len(data))
+	if _, err := io.WriteString(s.out, header); err != nil {
+		s.logger.Printf("write header error: %v", err)
+		return
+	}
+	if _, err := s.out.Write(data); err != nil {
+		s.logger.Printf("write body error: %v", err)
+		return
+	}
+}