script codegen: Avoid modifying in-place a generated file.

Cargo.lock

@@ -2299,6 +2299,7 @@ dependencies = [
  "script_traits 0.0.1",
  "selectors 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 0.8.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 0.8.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "servo_atoms 0.0.1",
  "servo_config 0.0.1",
  "servo_geometry 0.0.1",

components/script/Cargo.toml

@@ -18,7 +18,7 @@ debugmozjs = ['js/debugmozjs']
 cmake = "0.1"
 phf_codegen = "0.7.18"
 phf_shared = "0.7.18"
-regex = "0.2"
+serde_json = "0.8"
 
 [target.'cfg(any(target_os = "macos", target_os = "linux", target_os = "windows"))'.dependencies]
 tinyfiledialogs = "2.5.9"

components/script/build.rs

@@ -5,13 +5,13 @@
 extern crate cmake;
 extern crate phf_codegen;
 extern crate phf_shared;
-extern crate regex;
+extern crate serde_json;
 
-use regex::Regex;
+use serde_json::Value;
 use std::env;
 use std::fmt;
 use std::fs::File;
-use std::io::{Read, Write};
+use std::io::Write;
 use std::path::PathBuf;
 use std::time::Instant;
 
@@ -44,27 +44,17 @@ fn main() {
 
     println!("Binding generation completed in {}s", start.elapsed().as_secs());
 
-    convert_phf();
-}
-
-fn convert_phf() {
-    let filename = PathBuf::from(env::var("OUT_DIR").unwrap()).join("InterfaceObjectMap.rs");
-    let mut source = String::new();
-    File::open(&filename).unwrap().read_to_string(&mut source).unwrap();
-    let map_macro = Regex::new("phf_map! \\{([^}]+)\\}").unwrap().captures(&source).unwrap();
-    let entries_re = Regex::new("b\"([^\"]+)\" => ([^\n]+),\n").unwrap();
-    let entries = entries_re.captures_iter(&map_macro[1]);
-
+    let json = PathBuf::from(env::var("OUT_DIR").unwrap()).join("build").join("InterfaceObjectMapData.json");
+    let json: Value = serde_json::from_reader(File::open(&json).unwrap()).unwrap();
     let mut map = phf_codegen::Map::new();
-    for entry in entries {
-        map.entry(Bytes(entry.get(1).unwrap().as_str()), entry.get(2).unwrap().as_str());
+    for (key, value) in json.as_object().unwrap() {
+        map.entry(Bytes(key), value.as_str().unwrap());
     }
-
-    let mut file = File::create(&filename).unwrap();
-    let map_macro = map_macro.get(0).unwrap();
-    file.write_all(source[..map_macro.start()].as_bytes()).unwrap();
-    map.build(&mut file).unwrap();
-    file.write_all(source[map_macro.end()..].as_bytes()).unwrap();
+    let phf = PathBuf::from(env::var("OUT_DIR").unwrap()).join("InterfaceObjectMapPhf.rs");
+    let mut phf = File::create(&phf).unwrap();
+    write!(&mut phf, "pub static MAP: phf::Map<&'static [u8], unsafe fn(*mut JSContext, HandleObject)> = ").unwrap();
+    map.build(&mut phf).unwrap();
+    write!(&mut phf, ";\n").unwrap();
 }
 
 #[derive(Eq, PartialEq, Hash)]

components/script/dom/bindings/codegen/CodegenRust.py

@@ -6815,6 +6815,15 @@ class GlobalGenRoots():
         ], "\n")), pre="pub flags Globals: u8 {\n", post="\n}")
         globals_ = CGWrapper(CGIndenter(global_flags), pre="bitflags! {\n", post="\n}")
 
+        phf = CGGeneric("include!(concat!(env!(\"OUT_DIR\"), \"/InterfaceObjectMapPhf.rs\"));")
+
+        return CGList([
+            CGGeneric(AUTOGENERATED_WARNING_COMMENT),
+            CGList([imports, globals_, phf], "\n\n")
+        ])
+
+    @staticmethod
+    def InterfaceObjectMapData(config):
         pairs = []
         for d in config.getDescriptors(hasInterfaceObject=True, isInline=False):
             binding = toBindingNamespace(d.name)
@@ -6823,19 +6832,13 @@ class GlobalGenRoots():
                 pairs.append((ctor.identifier.name, binding, binding))
         pairs.sort(key=operator.itemgetter(0))
         mappings = [
-            CGGeneric('b"%s" => codegen::Bindings::%s::%s::DefineDOMInterface as unsafe fn(_, _),' % pair)
+            CGGeneric('"%s": "codegen::Bindings::%s::%s::DefineDOMInterface as unsafe fn(_, _)"' % pair)
             for pair in pairs
         ]
-        mapType = "phf::Map<&'static [u8], unsafe fn(*mut JSContext, HandleObject)>"
-        phf = CGWrapper(
-            CGIndenter(CGList(mappings, "\n")),
-            pre="pub static MAP: %s = phf_map! {\n" % mapType,
-            post="\n};\n")
-
-        return CGList([
-            CGGeneric(AUTOGENERATED_WARNING_COMMENT),
-            CGList([imports, globals_, phf], "\n\n")
-        ])
+        return CGWrapper(
+            CGList(mappings, ",\n"),
+            pre="{\n",
+            post="\n}\n")
 
     @staticmethod
     def PrototypeList(config):

components/script/dom/bindings/codegen/GlobalGen.py

@@ -76,6 +76,7 @@ def main():
             ('PrototypeList', 'PrototypeList.rs'),
             ('RegisterBindings', 'RegisterBindings.rs'),
             ('InterfaceObjectMap', 'InterfaceObjectMap.rs'),
+            ('InterfaceObjectMapData', 'InterfaceObjectMapData.json'),
             ('InterfaceTypes', 'InterfaceTypes.rs'),
             ('InheritTypes', 'InheritTypes.rs'),
             ('Bindings', os.path.join('Bindings', 'mod.rs')),