Fix escaping of \u0000 and a standalone surrogate

- ref: https://www.w3.org/TR/css-syntax-3/#consume-escaped-code-point
tabatkins · Mar 31, 2024 · 0d0fee3 · 0d0fee3
1 parent c6a916e
commit 0d0fee3
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diff --git a/parse-css.js b/parse-css.js
@@ -362,7 +362,7 @@ function tokenize(str) {
       }
       if(whitespace(next())) consume();
       var value = parseInt(digits.map(function(x){return String.fromCharCode(x);}).join(''), 16);
-      if( value > maximumallowedcodepoint ) value = 0xfffd;
+      if (value === 0x0 || between(value, 0xd800, 0xdfff) || value > maximumallowedcodepoint ) value = 0xfffd;
       return value;
     } else if(eof()) {
       return 0xfffd;

diff --git a/tests.js b/tests.js
@@ -398,6 +398,15 @@ var TESTS = [
         "value": "\uFFFD"
       },
     ]
+  }, {
+    parser: '',
+    css: `\\20000 \\0 \\D800 \\DFFF \\110000 `,
+    expected: [
+      {
+        "type": "IDENT",
+        "value": "\u{20000}\uFFFD\uFFFD\uFFFD\uFFFD"
+      },
+    ]
   }
 ];