Migrate code generation to cargo xtask workflow

.cargo/config.toml

@@ -0,0 +1,2 @@
+[alias]
+xtask = "run --package xtask --"

.github/workflows/main.yml

@@ -21,10 +21,14 @@ jobs:
         run: |
           rustup set profile minimal
           rustup override set ${{ matrix.version }}
+          rustup component add rustfmt
 
       - name: Init submodules
         run: git submodule update --init
 
+      - name: Codegen checks
+        run: cargo xtask codegen --check
+
       - name: Cargo bench
         run: cargo bench --all
         env:

Cargo.toml

@@ -3,6 +3,7 @@ members = [
     "markup5ever",
     "html5ever",
     "rcdom",
-    "xml5ever"
+    "xml5ever",
+    "xtask",
 ]
 resolver = "2"

README.md

@@ -41,6 +41,17 @@ git submodule update --init
 
 Run `cargo doc` in the repository root to build local documentation under `target/doc/`.
 
+### Code generation
+
+Some of the components of this repository are generated through automatic
+processes. `cargo xtask codegen` runs all generation tasks. Generate code is
+commited to the git repository.
+
+In particular, `cargo xtask codegen` generates:
+
+1. `markup5ever/generated.rs` and `markup5ever/data/named_entities.rs`.
+
+2. `html5ever/src/generated.rs`
 
 ## Details
 

html5ever/Cargo.toml

@@ -7,7 +7,6 @@ license = "MIT OR Apache-2.0"
 repository = "https://github.com/servo/html5ever"
 description = "High-performance browser-grade HTML5 parser"
 documentation = "https://docs.rs/html5ever"
-build = "build.rs"
 categories = [ "parser-implementations", "web-programming" ]
 edition = "2021"
 
@@ -23,11 +22,6 @@ markup5ever = { version = "0.12", path = "../markup5ever" }
 criterion = "0.5"
 typed-arena = "2.0.2"
 
-[build-dependencies]
-quote = "1"
-syn = { version = "2", features = ["extra-traits", "full", "fold"] }
-proc-macro2 = "1"
-
 [[bench]]
 name = "html5ever"
 harness = false