Implement MallocSizeOf for cssparser types (#399)

* Implement MallocSizeOf for cssparser types

* Fix clippy lints

Signed-off-by: Nico Burns <nico@nicoburns.com>

---------

Signed-off-by: Nico Burns <nico@nicoburns.com>

Author: nicoburns

.github/workflows/main.yml

@@ -22,6 +22,7 @@ jobs:
         features:
           -
           - --features dummy_match_byte
+          - --features malloc_size_of
         include:
           - toolchain: nightly
             features: --features bench

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cssparser"
-version = "0.34.0"
+version = "0.34.1"
 authors = ["Simon Sapin <simon.sapin@exyr.org>"]
 
 description = "Rust implementation of CSS Syntax Level 3"
@@ -25,6 +25,7 @@ dtoa-short = "0.3"
 itoa = "1.0"
 phf = { version = "0.11.2", features = ["macros"] }
 serde = { version = "1.0", features = ["derive"], optional = true }
+malloc_size_of = { version = "0.1", default-features = false, optional = true }
 smallvec = "1.0"
 
 [profile.profiling]

src/serializer.rs

@@ -466,6 +466,9 @@ pub enum TokenSerializationType {
     Other,
 }
 
+#[cfg(feature = "malloc_size_of")]
+malloc_size_of::malloc_size_of_is_0!(TokenSerializationType);
+
 impl TokenSerializationType {
     /// Return a value that represents the absence of a token, e.g. before the start of the input.
     #[deprecated(

src/tokenizer.rs

@@ -533,6 +533,9 @@ impl<'a> Tokenizer<'a> {
 #[derive(PartialEq, Eq, PartialOrd, Ord, Debug, Clone, Copy)]
 pub struct SourcePosition(pub(crate) usize);
 
+#[cfg(feature = "malloc_size_of")]
+malloc_size_of::malloc_size_of_is_0!(SourcePosition);
+
 impl SourcePosition {
     /// Returns the current byte index in the original input.
     #[inline]
@@ -552,6 +555,9 @@ pub struct SourceLocation {
     pub column: u32,
 }
 
+#[cfg(feature = "malloc_size_of")]
+malloc_size_of::malloc_size_of_is_0!(SourceLocation);
+
 fn next_token<'a>(tokenizer: &mut Tokenizer<'a>) -> Result<Token<'a>, ()> {
     if tokenizer.is_eof() {
         return Err(());