Auto merge of #15099 - servo:phf-no-macros, r=jdm

Remove usage of phf_macros.

It’s a compiler plugin that uses unstable compiler APIs that are not on a path to stabilization.

With this changes, there is one less thing that might break when we update the compiler. For example: https://github.com/sfackler/rust-phf/pull/101

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---
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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).

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- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because _____

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components/script/Cargo.toml

@@ -16,6 +16,9 @@ debugmozjs = ['js/debugmozjs']
 
 [build-dependencies]
 cmake = "0.1"
+phf_codegen = "0.7.18"
+phf_shared = "0.7.18"
+serde_json = "0.8"
 
 [target.'cfg(any(target_os = "macos", target_os = "linux", target_os = "windows"))'.dependencies]
 tinyfiledialogs = "2.5.9"
@@ -57,7 +60,6 @@ offscreen_gl_context = "0.5.0"
 open = "1.1.1"
 parking_lot = "0.3"
 phf = "0.7.18"
-phf_macros = "0.7.18"
 plugins = {path = "../plugins"}
 profile_traits = {path = "../profile_traits"}
 range = {path = "../range"}

components/script/build.rs

@@ -3,7 +3,16 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 extern crate cmake;
+extern crate phf_codegen;
+extern crate phf_shared;
+extern crate serde_json;
+
+use serde_json::Value;
 use std::env;
+use std::fmt;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
 use std::time::Instant;
 
 fn main() {
@@ -34,4 +43,33 @@ fn main() {
     build.build();
 
     println!("Binding generation completed in {}s", start.elapsed().as_secs());
+
+    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 (key, value) in json.as_object().unwrap() {
+        map.entry(Bytes(key), value.as_str().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)]
+struct Bytes<'a>(&'a str);
+
+impl<'a> fmt::Debug for Bytes<'a> {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("b\"")?;
+        formatter.write_str(self.0)?;
+        formatter.write_str("\" as &'static [u8]")
+    }
+}
+
+impl<'a> phf_shared::PhfHash for Bytes<'a> {
+    fn phf_hash<H: std::hash::Hasher>(&self, hasher: &mut H) {
+        self.0.as_bytes().phf_hash(hasher)
+    }
 }

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

@@ -6840,6 +6840,15 @@ 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)
@@ -6848,19 +6857,13 @@ 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')),

components/script/lib.rs

@@ -23,7 +23,6 @@
 
 #![doc = "The script crate contains all matters DOM."]
 
-#![plugin(phf_macros)]
 #![plugin(plugins)]
 
 extern crate angle;