init: initial commit

internal/parser/parser.go

@@ -0,0 +1,45 @@
+package parser
+
+import (
+	"fmt"
+	"path/filepath"
+	"strings"
+)
+
+// Parser interface for all document parsers.
+type Parser interface {
+	SupportedExtensions() []string
+	ParseToMarkdown(path string) (string, error)
+}
+
+// Registry holds registered parsers keyed by extension.
+type Registry struct {
+	parsers map[string]Parser
+}
+
+// NewRegistry creates a parser registry with all built-in parsers.
+func NewRegistry() *Registry {
+	r := &Registry{parsers: make(map[string]Parser)}
+	r.Register(&ExcelParser{})
+	r.Register(&PDFParser{})
+	r.Register(&CADParser{})
+	r.Register(&WordParser{})
+	return r
+}
+
+// Register adds a parser for its supported extensions.
+func (r *Registry) Register(p Parser) {
+	for _, ext := range p.SupportedExtensions() {
+		r.parsers[strings.ToLower(ext)] = p
+	}
+}
+
+// Parse dispatches to the appropriate parser based on file extension.
+func (r *Registry) Parse(path string) (string, error) {
+	ext := strings.ToLower(filepath.Ext(path))
+	p, ok := r.parsers[ext]
+	if !ok {
+		return "", fmt.Errorf("unsupported file type: %s", ext)
+	}
+	return p.ParseToMarkdown(path)
+}