Update charted to 0.4.8 and roll

packages/csslib/lib/src/tokenizer.dart

Index: packages/csslib/lib/src/tokenizer.dart
diff --git a/packages/csslib/lib/src/tokenizer.dart b/packages/csslib/lib/src/tokenizer.dart
index d423104bae92eb05e5a278fb249e603021de8486..d7677f9f211501f1c1564d1de483debc016f9ef7 100644
--- a/packages/csslib/lib/src/tokenizer.dart
+++ b/packages/csslib/lib/src/tokenizer.dart
@@ -97,7 +97,7 @@ class Tokenizer extends TokenizerBase {
       case TokenChar.HASH:
         return _finishToken(TokenKind.HASH);
       case TokenChar.PLUS:
-        if (maybeEatDigit()) return finishNumber();
+        if (_nextCharsAreNumber(ch)) return finishNumber();
         return _finishToken(TokenKind.PLUS);
       case TokenChar.MINUS:
         if (inSelectorExpression || unicodeRange) {
@@ -105,7 +105,7 @@ class Tokenizer extends TokenizerBase {
           // not part of identifier e.g., interval value range (e.g. U+400-4ff)
           // or minus operator in selector expression.
           return _finishToken(TokenKind.MINUS);
-        } else if (maybeEatDigit()) {
+        } else if (_nextCharsAreNumber(ch)) {
           return finishNumber();
         } else if (TokenizerHelpers.isIdentifierStart(ch)) {
           return finishIdentifier();
@@ -202,8 +202,13 @@ class Tokenizer extends TokenizerBase {
           } else {
             return _errorToken();
           }
-        } else if ((ch == UNICODE_U || ch == UNICODE_LOWER_U) &&
+        } else if (_inString &&
+            (ch == UNICODE_U || ch == UNICODE_LOWER_U) &&
             (_peekChar() == UNICODE_PLUS)) {
+          // `_inString` is misleading. We actually DON'T want to enter this
+          // block while tokenizing a string, but the parser sets this value to
+          // false while it IS consuming tokens within a string.
+          //
           // Unicode range: U+uNumber[-U+uNumber]
           //   uNumber = 0..10FFFF
           _nextChar(); // Skip +
@@ -260,7 +265,7 @@ class Tokenizer extends TokenizerBase {
   Token finishIdentifier() {
     // If we encounter an escape sequence, remember it so we can post-process
     // to unescape.
-    var chars = [];
+    var chars = <int>[];
 
     // backup so we can start with the first character
     int validateFrom = _index;
@@ -414,7 +419,6 @@ class Tokenizer extends TokenizerBase {
         }
       }
     }
-    return _errorToken();
   }
 }
 
@@ -446,7 +450,9 @@ class TokenizerHelpers {
         // http://www.w3.org/TR/CSS21/syndata.html#value-def-identifier
         // http://www.w3.org/TR/CSS21/syndata.html#characters
         // Also, escaped character should be allowed.
-        c == 95 /*_*/ || c >= 0xA0 || c == 92 /*\*/);
+        c == 95 /*_*/ ||
+        c >= 0xA0 ||
+        c == 92 /*\*/);
   }
 
   /** Pseudo function expressions identifiers can't have a minus sign. */