Replace manual code generation with procedural macro (#567)

* Replace manual code generation with procedural macros

This makes LSPs like rust-analyzer pick up the rules.rs
file, making it much easier to edit.

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

* Format rules.rs

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

---------

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

Author: simonwuelker

Cargo.toml

@@ -3,6 +3,11 @@ members = [
     "markup5ever",
     "html5ever",
     "rcdom",
-    "xml5ever"
+    "xml5ever",
+    "match_token"
 ]
+
+[workspace.dependencies]
+match_token = { path = "match_token" }
+
 resolver = "2"

html5ever/Cargo.toml

@@ -6,7 +6,6 @@ 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" ]
 keywords = ["html", "html5", "parser", "parsing"]
 edition = "2021"
@@ -19,16 +18,12 @@ trace_tokenizer = []
 log = "0.4"
 mac = "0.1"
 markup5ever = { version = "0.14", path = "../markup5ever" }
+match_token = { workspace = true }
 
 [dev-dependencies]
 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

html5ever/build.rs

@@ -43,13 +43,9 @@ pub use self::PushFlag::*;
 mod tag_sets;
 
 mod data;
+mod rules;
 mod types;
 
-#[allow(warnings)]
-mod autogenerated {
-    include!(concat!(env!("OUT_DIR"), "/rules.rs"));
-}
-
 /// Tree builder options, with an impl for Default.
 #[derive(Copy, Clone)]
 pub struct TreeBuilderOpts {

html5ever/src/tree_builder/mod.rs

@@ -10,7 +10,7 @@
 // The tree builder rules, as a single, enormous nested match expression.
 
 use crate::interface::Quirks;
-use crate::tokenizer::states::{Plaintext, Rawtext, Rcdata, ScriptData};
+use crate::tokenizer::states::{Rawtext, Rcdata, ScriptData};
 use crate::tokenizer::TagKind::{EndTag, StartTag};
 use crate::tree_builder::tag_sets::*;
 use crate::tree_builder::types::*;
@@ -19,12 +19,11 @@ use crate::tree_builder::{
     TreeSink,
 };
 use crate::QualName;
-use markup5ever::{expanded_name, local_name, namespace_prefix, namespace_url, ns};
+use markup5ever::{expanded_name, local_name, namespace_url, ns};
 use std::borrow::Cow::Borrowed;
 
-use std::borrow::ToOwned;
-
 use crate::tendril::SliceExt;
+use match_token::match_token;
 
 fn any_not_whitespace(x: &StrTendril) -> bool {
     // FIXME: this might be much faster as a byte scan
@@ -421,12 +420,9 @@ where
                         }
                     }
 
-                    match to_close {
-                        Some(name) => {
-                            self.generate_implied_end_except(name.clone());
-                            self.expect_to_close(name);
-                        }
-                        None => (),
+                    if let Some(name) = to_close {
+                        self.generate_implied_end_except(name.clone());
+                        self.expect_to_close(name);
                     }
 
                     self.close_p_element_in_button_scope();

html5ever/src/tree_builder/rules.rs

@@ -0,0 +1,12 @@
+[package]
+name = "match_token"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+syn = "2"
+quote = "1"
+proc-macro2 = "1"
+
+[lib]
+proc-macro = true