add initial lsp support

internal/lsp/protocol/pattern_interfaces.go

@@ -0,0 +1,58 @@
+package protocol
+
+import (
+	"fmt"
+	"strings"
+)
+
+// PatternInfo is an interface for types that represent glob patterns
+type PatternInfo interface {
+	GetPattern() string
+	GetBasePath() string
+	isPattern() // marker method
+}
+
+// StringPattern implements PatternInfo for string patterns
+type StringPattern struct {
+	Pattern string
+}
+
+func (p StringPattern) GetPattern() string  { return p.Pattern }
+func (p StringPattern) GetBasePath() string { return "" }
+func (p StringPattern) isPattern()          {}
+
+// RelativePatternInfo implements PatternInfo for RelativePattern
+type RelativePatternInfo struct {
+	RP       RelativePattern
+	BasePath string
+}
+
+func (p RelativePatternInfo) GetPattern() string  { return string(p.RP.Pattern) }
+func (p RelativePatternInfo) GetBasePath() string { return p.BasePath }
+func (p RelativePatternInfo) isPattern()          {}
+
+// AsPattern converts GlobPattern to a PatternInfo object
+func (g *GlobPattern) AsPattern() (PatternInfo, error) {
+	if g.Value == nil {
+		return nil, fmt.Errorf("nil pattern")
+	}
+
+	switch v := g.Value.(type) {
+	case string:
+		return StringPattern{Pattern: v}, nil
+	case RelativePattern:
+		// Handle BaseURI which could be string or DocumentUri
+		basePath := ""
+		switch baseURI := v.BaseURI.Value.(type) {
+		case string:
+			basePath = strings.TrimPrefix(baseURI, "file://")
+		case DocumentUri:
+			basePath = strings.TrimPrefix(string(baseURI), "file://")
+		default:
+			return nil, fmt.Errorf("unknown BaseURI type: %T", v.BaseURI.Value)
+		}
+		return RelativePatternInfo{RP: v, BasePath: basePath}, nil
+	default:
+		return nil, fmt.Errorf("unknown pattern type: %T", g.Value)
+	}
+}