feat: add the TreeConstructor module

WIP: The implementation of this module is in progress.

Package.swift

@@ -14,7 +14,8 @@ let package = Package(
         .visionOS(.v1),
     ],
     products: [
-        .library(name: "Tokenizer", targets: ["Tokenizer"])
+        .library(name: "Tokenizer", targets: ["Tokenizer"]),
+        .library(name: "TreeConstructor", targets: ["TreeConstructor"]),
     ],
     dependencies: [
         .package(url: "https://github.com/apple/swift-syntax", "509.0.0"..<"601.0.0"),
@@ -36,6 +37,17 @@ let package = Package(
                 .enableUpcomingFeature("ExistentialAny"),
             ]
         ),
+        .target(
+            name: "TreeConstructor",
+            dependencies: [
+                "Tokenizer"
+            ],
+            swiftSettings: [
+                .unsafeFlags(["-Xfrontend", "-warn-long-function-bodies=100"], .when(configuration: .debug)),
+                .unsafeFlags(["-Xfrontend", "-warn-long-expression-type-checking=100"], .when(configuration: .debug)),
+                .enableUpcomingFeature("ExistentialAny"),
+            ]
+        ),
         .macro(
             name: "TokenizerMacros",
             dependencies: [

README.md

@@ -13,9 +13,9 @@ Zyphy is (or will be) a fast web browser engine written in Swift.
   - (Nothing)
 - 🚧 Work in Progress
   - `Tokenizer` - An HTML tokenizer ([specs](https://html.spec.whatwg.org/multipage/parsing.html#tokenization))
+  - `TreeConstructor` - An HTML tree constructor ([specs](https://html.spec.whatwg.org/multipage/parsing.html#tree-construction))
 - 🥚 To Do
   - `Zyphy` - The main module
-  - `TreeConstructor` - An HTML tree constructor ([specs](https://html.spec.whatwg.org/multipage/parsing.html#tree-construction))
 
 ## Prerequisites
 

Sources/TreeConstructor/InsertionMode.swift

@@ -0,0 +1,25 @@
+enum InsertionMode {
+    case initial
+    case beforeHTML
+    case beforeHead
+    case inHead
+    case inHeadNoscript
+    case afterHead
+    case inBody
+    case text
+    case inTable
+    case inTableText
+    case inCaption
+    case inColumnGroup
+    case inTableBody
+    case inRow
+    case inCell
+    case inSelect
+    case inSelectInTable
+    case inTemplate
+    case afterBody
+    case inFrameset
+    case afterFrameset
+    case afterAfterBody
+    case afterAfterFrameset
+}

Sources/TreeConstructor/TreeConstructor.swift

@@ -0,0 +1,15 @@
+import Tokenizer
+
+public struct TreeConstructor {
+    private var mode: InsertionMode
+
+    public init() {
+        self.mode = .initial
+    }
+}
+
+extension TreeConstructor: TokenSink {
+    mutating func process(_ token: consuming Token) {
+        // TODO: Implement here
+    }
+}