update: add cache

src/cache.zig

@@ -0,0 +1,57 @@
+const std = @import("std");
+const Allocator = std.heap.ArenaAllocator;
+
+const parser = @import("parser.zig");
+
+pub const TemplateCache = struct {
+    arena: Allocator,
+    cache: std.StringHashMapUnmanaged([]parser.Node),
+
+    pub fn init(child_allocator: std.mem.Allocator) TemplateCache {
+        const arena = std.heap.ArenaAllocator.init(child_allocator);
+        return .{
+            .arena = arena,
+            .cache = .{},
+        };
+    }
+
+
+    pub fn deinit(self: *TemplateCache) void {
+        self.arena.deinit();
+    }
+
+    pub fn allocator(self: *TemplateCache) std.mem.Allocator {
+        return self.arena.allocator();
+    }
+
+    pub fn get(self: *const TemplateCache, key: []const u8) ?[]parser.Node {
+        return self.cache.get(key);
+    }
+
+    pub fn add(self: *TemplateCache, key: []const u8, nodes: []parser.Node) !void {
+        // const key_copy = try self.arena.dupe(u8, key);
+        // errdefer self.arena.free(key_copy);
+
+        // try self.cache.put(self.arena, key, nodes);
+        const gop = try self.cache.getOrPut(self.allocator(), key);
+        if (!gop.found_existing) {
+            gop.key_ptr.* = try self.allocator().dupe(u8, key);
+            gop.value_ptr.* = nodes;
+        }
+        gop.value_ptr.* = nodes;
+    }
+
+    pub fn invalidate(self: *TemplateCache, key: []const u8) void {
+        if (self.cache.getEntry(key)) |entry| {
+            self.arena.free(entry.key_ptr.*);
+            for (entry.value_ptr.*) |node| node.deinit(self.arena);
+            self.arena.free(entry.value_ptr.*);
+            _ = self.cache.remove(key);
+        }
+    }
+
+    pub fn clear(self: *TemplateCache) void {
+        self.deinit();
+        self.cache = .{};
+    }
+};

src/renderer.zig

@@ -9,6 +9,7 @@ const Value = @import("context.zig").Value;
 const builtin_filters = @import("filters.zig").builtin_filters;
 const FilterError = @import("filters.zig").FilterError;
 const parser = @import("parser.zig");
+const TemplateCache = @import("cache.zig").TemplateCache;
 
 pub const RenderError = FilterError || error{
     OutOfMemory,
@@ -44,11 +45,13 @@ pub const RenderError = FilterError || error{
 pub const Renderer = struct {
     context: *Context,
     allocator: Allocator,
+    cache: *TemplateCache,
 
-    pub fn init(context: *Context) Renderer {
+    pub fn init(context: *Context, cache: *TemplateCache) Renderer {
         return .{
             .context = context,
             .allocator = context.allocator(),
+            .cache = cache,
         };
     }
 
@@ -72,24 +75,7 @@ pub const Renderer = struct {
         };
     }
 
-    pub fn render(self: *const Renderer, template: []const u8, writer: anytype) RenderError!void {
-        const base_template = try self.readTemplateFile(template);
-        defer self.allocator.free(base_template);
-        return self.renderString(base_template, writer);
-    }
-
-    pub fn renderString(self: *const Renderer, template: []const u8, writer: anytype) RenderError!void {
-        var arena = std.heap.ArenaAllocator.init(self.allocator);
-        defer arena.deinit();
-        const alloc = arena.allocator();
-
-        var p = parser.Parser.init(template);
-        const nodes = try p.parse(alloc);
-        defer {
-            for (nodes) |node| node.deinit(alloc);
-            alloc.free(nodes);
-        }
-
+    fn renderNodes(self: *const Renderer, alloc: Allocator, nodes: []parser.Node, writer: anytype) RenderError!void {
         const extends_node = self.checkForExtends(nodes);
 
         if (extends_node) |ext| {
@@ -110,6 +96,50 @@ pub const Renderer = struct {
         }
     }
 
+    fn renderTemplate(self: *const Renderer, template: []const u8, writer: anytype, cache_key: ?[]const u8) RenderError!void {
+        var arena = std.heap.ArenaAllocator.init(self.allocator);
+        defer arena.deinit();
+        const alloc = arena.allocator();
+
+        if (cache_key) |ck| {
+            if (self.cache.get(ck)) |cached_nodes| {
+                try self.renderNodes(alloc, cached_nodes, writer);
+                return;
+            }
+        }
+
+        var p = parser.Parser.init(template);
+        const nodes = try p.parse(alloc);
+        defer {
+            for (nodes) |node| node.deinit(alloc);
+            alloc.free(nodes);
+        }
+
+        if (cache_key) |ck| {
+            var alc = self.cache.allocator();
+            var cached_nodes = try alc.alloc(parser.Node, nodes.len);
+            errdefer alc.free(cached_nodes);
+            for (nodes, 0..) |node, i| {
+                cached_nodes[i] = try node.clone(self.allocator);
+                std.debug.print("clonou {any}\n", .{cached_nodes[i]});
+            }
+            try self.cache.add(ck, nodes);
+        }
+
+        return try self.renderNodes(alloc, nodes, writer);
+    }
+
+    pub fn render(self: *const Renderer, template_path: []const u8, writer: anytype) RenderError!void {
+        const base_template = try self.readTemplateFile(template_path);
+        defer self.allocator.free(base_template);
+
+        return try self.renderTemplate(base_template, writer, template_path);
+    }
+
+    pub fn renderString(self: *const Renderer, template: []const u8, writer: anytype) RenderError!void {
+        return try self.renderTemplate(template, writer, null);
+    }
+
     fn renderWithInheritance(self: *const Renderer, alloc: Allocator, base_nodes: []parser.Node, child_nodes: []parser.Node, writer: anytype) RenderError!void {
         for (base_nodes) |base_node| {
             if (base_node.type == .block) {