Rewrite double.parse.

runtime/lib/string_patch.dart

Index: runtime/lib/string_patch.dart
diff --git a/runtime/lib/string_patch.dart b/runtime/lib/string_patch.dart
index 3fb0f721ee8ba398e5d9b24246fe188ac7b2aa04..f728341268f04bff2c54afdf027a76127e8bea87 100644
--- a/runtime/lib/string_patch.dart
+++ b/runtime/lib/string_patch.dart
@@ -200,12 +200,48 @@ class _StringBase {
       native "StringBase_substringUnchecked";
 
   // Checks for one-byte whitespaces only.
-  // TODO(srdjan): Investigate if 0x85 (NEL) and 0xA0 (NBSP) are valid
-  // whitespaces for one byte strings.
   static bool _isOneByteWhitespace(int codePoint) {
     return
       (codePoint == 32) || // Space.
-      ((9 <= codePoint) && (codePoint <= 13)); // CR, LF, TAB, etc.
+      ((9 <= codePoint) && (codePoint <= 13)) || // CR, LF, TAB, etc.
+      (codePoint == 0x85) ||  // NEL
+      (codePoint == 0xA0);  // NBSP
+  }
+
+  // Characters in the Zl category:
+  //  U+0020  SPACE
+  //  U+00A0  NO-BREAK SPACE
+  //  U+1680  OGHAM SPACE MARK
+  //  U+180E  MONGOLIAN VOWEL SEPARATOR
+  //  U+2000  EN QUAD
+  //  U+2001  EM QUAD
+  //  U+2002  EN SPACE
+  //  U+2003  EM SPACE
+  //  U+2004  THREE-PER-EM SPACE
+  //  U+2005  FOUR-PER-EM SPACE
+  //  U+2006  SIX-PER-EM SPACE
+  //  U+2007  FIGURE SPACE
+  //  U+2008  PUNCTUATION SPACE
+  //  U+2009  THIN SPACE
+  //  U+200A  HAIR SPACE
+  //  U+202F  NARROW NO-BREAK SPACE
+  //  U+205F  MEDIUM MATHEMATICAL SPACE
+  //  U+3000  IDEOGRAPHIC SPACE
+  //
+  // Characters in the Zl category: 0x2028
+  // Characters in the Zp category: 0x2029
+  // BOM: 0xFEFF
+  static bool _isTwoByteWhitespace(int codePoint) {
+    if (codePoint < 256) return _isOneByteWhitespace(codePoint);
+    return (codePoint == 0x1680) ||
+        (codePoint == 0x180E) ||
+        ((0x2000 <= codePoint) && (codePoint <= 0x200A)) ||
+        (codePoint == 0x202F) ||
+        (codePoint == 0x205F) ||
+        (codePoint == 0x3000) ||
+        (codePoint == 0x2028) ||
+        (codePoint == 0x2029) ||
+        (codePoint == 0xFEFF);
   }
 
   String trim() {
@@ -573,8 +609,7 @@ class _TwoByteString extends _StringBase implements String {
   }
 
   bool _isWhitespace(int codePoint) {
-    // For now we only check for one byte white space characters.
-    return _StringBase._isOneByteWhitespace(codePoint);
+    return _StringBase._isTwoByteWhitespace(codePoint);
   }
 }
 
@@ -598,8 +633,7 @@ class _ExternalTwoByteString extends _StringBase implements String {
   }
 
   bool _isWhitespace(int codePoint) {
-    // For now we only check for one byte white space characters.
-    return _StringBase._isOneByteWhitespace(codePoint);
+    return _StringBase._isTwoByteWhitespace(codePoint);
   }
 }