Add rudimentary css parser

Doesn't actually parse declaration values yet.

Cargo.lock

@@ -1,3 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
 [[package]]
 name = "autocfg"
 version = "0.1.2"
@@ -8,6 +10,14 @@ name = "bitflags"
 version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "c2-chacha"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "ppv-lite86 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "cfg-if"
 version = "0.1.6"
@@ -21,6 +31,44 @@ dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "cssparser"
+version = "0.27.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cssparser-macros 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "dtoa-short 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "matches 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "phf 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "cssparser-macros"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "quote 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "dtoa"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "dtoa-short"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "dtoa 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "fuchsia-cprng"
 version = "0.1.1"
@@ -35,6 +83,16 @@ dependencies = [
  "new_debug_unreachable 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "getrandom"
+version = "0.1.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasi 0.9.0+wasi-snapshot-preview1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "html5ever"
 version = "0.22.5"
@@ -50,7 +108,7 @@ dependencies = [
 
 [[package]]
 name = "idna"
-version = "0.1.5"
+version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "matches 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -65,12 +123,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "lazy_static"
-version = "1.3.0"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libc"
-version = "0.2.49"
+version = "0.2.67"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -88,7 +146,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "maplit"
-version = "1.0.1"
+version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -118,7 +176,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "percent-encoding"
-version = "1.0.1"
+version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -129,6 +187,16 @@ dependencies = [
  "phf_shared 0.7.24 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "phf"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "phf_macros 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "phf_shared 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro-hack 0.5.11 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "phf_codegen"
 version = "0.7.24"
@@ -147,6 +215,28 @@ dependencies = [
  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "phf_generator"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "phf_shared 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "phf_macros"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "phf_generator 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "phf_shared 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro-hack 0.5.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "phf_shared"
 version = "0.7.24"
@@ -155,11 +245,34 @@ dependencies = [
  "siphasher 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "phf_shared"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "siphasher 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "ppv-lite86"
+version = "0.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "precomputed-hash"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "proc-macro-hack"
+version = "0.5.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.16 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "proc-macro2"
 version = "0.4.27"
@@ -168,6 +281,14 @@ dependencies = [
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "proc-macro2"
+version = "1.0.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "quote"
 version = "0.6.11"
@@ -176,13 +297,21 @@ dependencies = [
  "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "quote"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rand"
 version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_chacha 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_hc 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -194,6 +323,19 @@ dependencies = [
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rand"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "getrandom 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_chacha 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_hc 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_pcg 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rand_chacha"
 version = "0.1.1"
@@ -203,6 +345,15 @@ dependencies = [
  "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rand_chacha"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "c2-chacha 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rand_core"
 version = "0.3.1"
@@ -216,6 +367,14 @@ name = "rand_core"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "rand_core"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "getrandom 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rand_hc"
 version = "0.1.0"
@@ -224,6 +383,14 @@ dependencies = [
  "rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rand_hc"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rand_isaac"
 version = "0.1.1"
@@ -237,7 +404,7 @@ name = "rand_jitter"
 version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -249,7 +416,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.49 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -264,6 +431,14 @@ dependencies = [
  "rand_core 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rand_pcg"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rand_xorshift"
 version = "0.1.1"
@@ -289,12 +464,13 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 name = "sanitizer"
 version = "0.1.0"
 dependencies = [
+ "cssparser 0.27.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "html5ever 0.22.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "maplit 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "maplit 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "string_cache 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "string_cache 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "typed-arena 1.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "typed-arena 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "url 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -327,17 +503,27 @@ name = "siphasher"
 version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "siphasher"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "smallvec"
 version = "0.6.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "smallvec"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "string_cache"
 version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "new_debug_unreachable 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "phf_shared 0.7.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "precomputed-hash 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -346,6 +532,18 @@ dependencies = [
  "string_cache_shared 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "string_cache"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "new_debug_unreachable 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "phf_shared 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "precomputed-hash 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.88 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "string_cache_codegen"
 version = "0.4.2"
@@ -373,6 +571,16 @@ dependencies = [
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "syn"
+version = "1.0.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "tendril"
 version = "0.4.1"
@@ -385,7 +593,7 @@ dependencies = [
 
 [[package]]
 name = "typed-arena"
-version = "1.4.1"
+version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -409,14 +617,19 @@ name = "unicode-xid"
 version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "unicode-xid"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "url"
-version = "1.7.2"
+version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "idna 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "idna 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "matches 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "percent-encoding 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -424,6 +637,11 @@ name = "utf-8"
 version = "0.7.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "wasi"
+version = "0.9.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "winapi"
 version = "0.3.6"
@@ -446,38 +664,57 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [metadata]
 "checksum autocfg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "a6d640bee2da49f60a4068a7fae53acde8982514ab7bae8b8cea9e88cbcfd799"
 "checksum bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "228047a76f468627ca71776ecdebd732a3423081fcf5125585bcd7c49886ce12"
+"checksum c2-chacha 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "214238caa1bf3a496ec3392968969cab8549f96ff30652c9e56885329315f6bb"
 "checksum cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "082bb9b28e00d3c9d39cc03e64ce4cea0f1bb9b3fde493f0cbc008472d22bdf4"
 "checksum cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ddfc5b9aa5d4507acaf872de71051dfd0e309860e88966e1051e462a077aac4f"
+"checksum cssparser 0.27.2 (registry+https://github.com/rust-lang/crates.io-index)" = "754b69d351cdc2d8ee09ae203db831e005560fc6030da058f86ad60c92a9cb0a"
+"checksum cssparser-macros 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "dfae75de57f2b2e85e8768c3ea840fd159c8f33e2b6522c7835b7abac81be16e"
+"checksum dtoa 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)" = "4358a9e11b9a09cf52383b451b49a169e8d797b68aa02301ff586d70d9661ea3"
+"checksum dtoa-short 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "59020b8513b76630c49d918c33db9f4c91638e7d3404a28084083b87e33f76f2"
 "checksum fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "a06f77d526c1a601b7c4cdd98f54b5eaabffc14d5f2f0296febdc7f357c6d3ba"
 "checksum futf 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "7c9c1ce3fa9336301af935ab852c437817d14cd33690446569392e65170aac3b"
+"checksum getrandom 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)" = "7abc8dd8451921606d809ba32e95b6111925cd2906060d2dcc29c070220503eb"
 "checksum html5ever 0.22.5 (registry+https://github.com/rust-lang/crates.io-index)" = "c213fa6a618dc1da552f54f85cba74b05d8e883c92ec4e89067736938084c26e"
-"checksum idna 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "38f09e0f0b1fb55fdee1f17470ad800da77af5186a1a76c026b679358b7e844e"
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+"checksum rand_pcg 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "16abd0c1b639e9eb4d7c50c0b8100b0d0f849be2349829c740fe8e6eb4816429"
 "checksum rand_xorshift 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cbf7e9e623549b0e21f6e97cf8ecf247c1a8fd2e8a992ae265314300b2455d5c"
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@@ -485,18 +722,24 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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Cargo.toml

@@ -5,9 +5,10 @@ authors = ["Tyler Hallada <tyler@consider.co>"]
 edition = "2018"
 
 [dependencies]
+cssparser = "0.27.2"
 html5ever = "*"
-lazy_static = "1.3.0"
+lazy_static = "1.4.0"
-maplit = "1.0.1"
+maplit = "1.0.2"
-string_cache = "0.7"
+string_cache = "0.8"
-typed-arena = "1.4.1"
+typed-arena = "2.0.1"
-url = "1.7.2"
+url = "2.1.1"

src/arena_dom.rs

@@ -58,6 +58,7 @@ pub struct Sink<'arena> {
     quirks_mode: QuirksMode,
 }
 
+#[derive(Debug)]
 pub struct Node<'arena> {
     pub parent: Link<'arena>,
     pub next_sibling: Link<'arena>,
@@ -67,6 +68,7 @@ pub struct Node<'arena> {
     pub data: NodeData<'arena>,
 }
 
+#[derive(Debug)]
 pub enum NodeData<'arena> {
     Document,
     Doctype {

src/css_parser.rs

@@ -0,0 +1,136 @@
+use cssparser::{
+    AtRuleParser, CowRcStr, DeclarationListParser, DeclarationParser, ParseError, Parser,
+    ParserInput, QualifiedRuleParser, RuleListParser, SourceLocation,
+};
+use std::error::Error;
+
+#[derive(Debug)]
+pub struct CssRule {
+    pub selectors: String,
+    pub declarations: Vec<CssDeclaration>,
+}
+
+#[derive(Debug)]
+pub struct CssDeclaration {
+    pub property: String,
+    pub value: String,
+}
+
+#[derive(Debug)]
+pub enum CssError {}
+
+pub type CssParseError<'i> = ParseError<'i, CssError>;
+
+struct CssParser;
+
+impl<'i> AtRuleParser<'i> for CssParser {
+    type PreludeBlock = ();
+    type PreludeNoBlock = ();
+    type AtRule = CssRule;
+    type Error = CssError;
+}
+
+impl<'i> QualifiedRuleParser<'i> for CssParser {
+    type Prelude = String;
+    type QualifiedRule = CssRule;
+    type Error = CssError;
+
+    fn parse_prelude<'t>(
+        &mut self,
+        input: &mut Parser<'i, 't>,
+    ) -> Result<Self::Prelude, CssParseError<'i>> {
+        let location = input.current_source_location();
+        dbg!(&location);
+        let position = input.position();
+        dbg!(&position);
+        while input.next().is_ok() {}
+        Ok(input.slice_from(position).to_string())
+    }
+
+    fn parse_block<'t>(
+        &mut self,
+        selectors: Self::Prelude,
+        _location: SourceLocation,
+        input: &mut Parser<'i, 't>,
+    ) -> Result<CssRule, CssParseError<'i>> {
+        dbg!(&selectors);
+        Ok(CssRule {
+            selectors,
+            declarations: parse_declarations(input).unwrap(),
+        })
+    }
+}
+
+pub fn parse_css_stylesheet(css: &str) -> Vec<CssRule> {
+    let mut parser_input = ParserInput::new(css);
+    let mut parser = Parser::new(&mut parser_input);
+
+    let rule_list_parser = RuleListParser::new_for_stylesheet(&mut parser, CssParser);
+
+    let mut rules = Vec::new();
+
+    for result in rule_list_parser {
+        let rule = match result {
+            Ok(r) => r,
+            Err((error, string)) => {
+                eprintln!("Rule dropped: {:?}, {:?}", error, string);
+                continue;
+            }
+        };
+        rules.push(rule);
+    }
+
+    rules
+}
+
+pub fn parse_css_style_attribute(css: &str) -> Vec<CssDeclaration> {
+    let mut parser_input = ParserInput::new(css);
+    let mut parser = Parser::new(&mut parser_input);
+
+    parse_declarations(&mut parser).unwrap()
+}
+
+#[derive(Debug)]
+struct CssDeclarationParser;
+
+impl<'i> DeclarationParser<'i> for CssDeclarationParser {
+    type Declaration = Vec<CssDeclaration>;
+    type Error = CssError;
+
+    fn parse_value<'t>(
+        &mut self,
+        name: CowRcStr<'i>,
+        mut input: &mut Parser<'i, 't>,
+    ) -> Result<Self::Declaration, ParseError<'i, CssError>> {
+        Ok(vec![])
+    }
+}
+
+impl<'i> AtRuleParser<'i> for CssDeclarationParser {
+    type PreludeBlock = ();
+    type PreludeNoBlock = ();
+    type AtRule = Vec<CssDeclaration>;
+    type Error = CssError;
+}
+
+pub fn parse_declarations<'i>(
+    input: &mut Parser<'i, '_>,
+) -> Result<Vec<CssDeclaration>, Box<dyn Error>> {
+    let mut declarations = Vec::new();
+    let declaration_list_parser = DeclarationListParser::new(input, CssDeclarationParser);
+
+    for declaration_list in declaration_list_parser {
+        let declaration_list = match declaration_list {
+            Ok(l) => l,
+            Err(e) => {
+                eprintln!("CSS declaration dropped: {:?}", e);
+                continue;
+            }
+        };
+        for declaration in declaration_list {
+            declarations.push(declaration);
+        }
+    }
+
+    Ok(declarations)
+}

src/main.rs

@@ -1,3 +1,4 @@
+#![warn(clippy::all)]
 #[macro_use]
 extern crate lazy_static;
 #[macro_use]
@@ -5,6 +6,7 @@ extern crate html5ever;
 #[macro_use]
 extern crate maplit;
 extern crate typed_arena;
+extern crate cssparser;
 
 use std::collections::HashSet;
 use std::default::Default;
@@ -17,7 +19,9 @@ use url::{ParseError, Url};
 
 mod arena_dom;
 mod config;
+mod css_parser;
 
+use css_parser::{parse_css_style_attribute, parse_css_stylesheet};
 use arena_dom::{create_element, html5ever_parse_slice_into_arena, Arena, NodeData, Ref};
 use config::permissive::{ADD_ATTRIBUTES, ALL_ATTRIBUTES, ATTRIBUTES, ELEMENTS, PROTOCOLS};
 
@@ -66,9 +70,22 @@ fn transform_node<'arena>(node: Ref<'arena>, arena: Arena<'arena>) {
     match node.data {
         NodeData::Document
         | NodeData::Doctype { .. }
-        | NodeData::Text { .. }
         | NodeData::Comment { .. }
         | NodeData::ProcessingInstruction { .. } => {}
+        NodeData::Text { ref contents } => {
+            dbg!(contents);
+            // TODO: seems rather expensive to lookup the parent on every Text node. Better
+            // solution would be to pass some sort of context from the parent that marks that this
+            // Text node is inside a <style>.
+            if let Some(parent) = node.parent.get() {
+                if let NodeData::Element { ref name, .. } = parent.data {
+                    if name.local == local_name!("style") {
+                        let rules = parse_css_stylesheet(&contents.borrow());
+                        dbg!(&rules);
+                    }
+                }
+            }
+        }
         NodeData::Element {
             ref attrs,
             ref name,
@@ -80,7 +97,6 @@ fn transform_node<'arena>(node: Ref<'arena>, arena: Arena<'arena>) {
             if let Some(element_attrs) = ATTRIBUTES.get(&name.local) {
                 allowed_attrs = allowed_attrs
                     .union(element_attrs)
-                    .into_iter()
                     .cloned()
                     .collect();
             }
@@ -89,6 +105,12 @@ fn transform_node<'arena>(node: Ref<'arena>, arena: Arena<'arena>) {
                 if !allowed_attrs.contains(&attrs[i].name.local) {
                     attrs.remove(i);
                 } else {
+                    if attrs[i].name.local == local_name!("style") {
+                        let css_str = &attrs[i].value;
+                        dbg!(&css_str);
+                        let declarations = parse_css_style_attribute(css_str);
+                        dbg!(&declarations);
+                    }
                     i += 1;
                 }
             }