package tools
import (
"context"
"fmt"
"strings"
"github.com/isaacphi/mcp-language-server/internal/lsp"
"github.com/isaacphi/mcp-language-server/internal/protocol"
)
// GetHoverInfo retrieves hover information (type, documentation) for a symbol at the specified position
func GetHoverInfo(ctx context.Context, client *lsp.Client, filePath string, line, column int) (string, error) {
// Open the file if not already open
err := client.OpenFile(ctx, filePath)
if err != nil {
return "", fmt.Errorf("could not open file: %v", err)
}
params := protocol.HoverParams{}
// Convert 1-indexed line/column to 0-indexed for LSP protocol
position := protocol.Position{
Line: uint32(line - 1),
Character: uint32(column - 1),
}
uri := protocol.DocumentUri("file://" + filePath)
params.TextDocument = protocol.TextDocumentIdentifier{
URI: uri,
}
params.Position = position
// Execute the hover request
hoverResult, err := client.Hover(ctx, params)
if err != nil {
return "", fmt.Errorf("failed to get hover information: %v", err)
}
var result strings.Builder
// Process the hover contents based on Markup content
if hoverResult.Contents.Value == "" {
// Extract the line where the hover was requested
lineText, err := ExtractTextFromLocation(protocol.Location{
URI: uri,
Range: protocol.Range{
Start: protocol.Position{
Line: position.Line,
Character: 0,
},
End: protocol.Position{
Line: position.Line + 1,
Character: 0,
},
},
})
if err != nil {
toolsLogger.Warn("failed to extract line at position: %v", err)
}
result.WriteString(fmt.Sprintf("No hover information available for this position on the following line:\n%s", lineText))
} else {
result.WriteString(hoverResult.Contents.Value)
}
return result.String(), nil
}
