so... jai :D

src/lsp/document.zig

@@ -0,0 +1,48 @@
+const std = @import("std");
+
+pub const DocumentStore = struct {
+    documents: std.StringHashMap(Document),
+    allocator: std.mem.Allocator,
+
+    pub const Document = struct {
+        uri: []const u8,
+        text: []const u8,
+        version: i64,
+    };
+
+    pub fn init(allocator: std.mem.Allocator) DocumentStore {
+        return .{
+            .documents = std.StringHashMap(Document).init(allocator),
+            .allocator = allocator,
+        };
+    }
+
+    pub fn open(self: *DocumentStore, uri: []const u8, text: []const u8, version: i64) !void {
+        const uri_copy = try self.allocator.dupe(u8, uri);
+        const text_copy = try self.allocator.dupe(u8, text);
+        try self.documents.put(uri_copy, .{
+            .uri = uri_copy,
+            .text = text_copy,
+            .version = version,
+        });
+    }
+
+    pub fn update(self: *DocumentStore, uri: []const u8, text: []const u8, version: i64) !void {
+        if (self.documents.getPtr(uri)) |doc| {
+            self.allocator.free(doc.text);
+            doc.text = try self.allocator.dupe(u8, text);
+            doc.version = version;
+        }
+    }
+
+    pub fn close(self: *DocumentStore, uri: []const u8) void {
+        if (self.documents.fetchRemove(uri)) |kv| {
+            self.allocator.free(kv.value.text);
+            self.allocator.free(kv.key);
+        }
+    }
+
+    pub fn get(self: *const DocumentStore, uri: []const u8) ?*const Document {
+        return self.documents.getPtr(uri);
+    }
+};