Allow @supports and @Viewport (without checking)

This change is a temporary workaround that adds an interim/initial/partial level
of support for allowing the @supports and @Viewport at-rules. The intent is that
we’ll add full support for them later, and then at that time back this change
out — or else at least just use it as a starting point for full support.

This change simply causes no errors to be reported for stylesheets that use
@supports and @Viewport. Beyond that, it doesn’t add any checking to report an
error if the content of a particular @supports at-rule or @Viewport at-rule
doesn’t conform to the requirements in the relevant CSS specs.

Addresses #111

Author: sideshowbarker

org/w3c/css/parser/analyzer/CssParser.java

@@ -2412,7 +2412,10 @@ final public void ignoreStatement() throws ParseException {
                                 addAtRuleError();
                         }
                 } else {
-                        addAtRuleError();
+                        if (!n.toString().startsWith("@supports")
+                                && !n.toString().startsWith("@viewport")) {
+                                addAtRuleError();
+                        }
                 }
             skipStatement();
   }
@@ -5731,30 +5734,6 @@ private boolean jj_2_5(int xla)
     finally { jj_save(4, xla); }
   }
 
-  private boolean jj_3R_175()
- {
-    if (jj_scan_token(STRING)) return true;
-    return false;
-  }
-
-  private boolean jj_3R_154()
- {
-    if (jj_scan_token(PLUS)) return true;
-    return false;
-  }
-
-  private boolean jj_3R_174()
- {
-    if (jj_3R_183()) return true;
-    return false;
-  }
-
-  private boolean jj_3R_173()
- {
-    if (jj_3R_152()) return true;
-    return false;
-  }
-
   private boolean jj_3R_172()
  {
     if (jj_3R_151()) return true;
@@ -6375,6 +6354,30 @@ private boolean jj_3R_176()
     return false;
   }
 
+  private boolean jj_3R_175()
+ {
+    if (jj_scan_token(STRING)) return true;
+    return false;
+  }
+
+  private boolean jj_3R_154()
+ {
+    if (jj_scan_token(PLUS)) return true;
+    return false;
+  }
+
+  private boolean jj_3R_174()
+ {
+    if (jj_3R_183()) return true;
+    return false;
+  }
+
+  private boolean jj_3R_173()
+ {
+    if (jj_3R_152()) return true;
+    return false;
+  }
+
   /** Generated Token Manager. */
   public CssParserTokenManager token_source;
   SimpleCharStream jj_input_stream;

org/w3c/css/parser/analyzer/CssParser.jj

@@ -1553,7 +1553,10 @@ void atRuleDeclaration() :
 				addAtRuleError();
 			}
 		} else {
-			addAtRuleError();
+			if (!n.toString().startsWith("@supports")
+				&& !n.toString().startsWith("@viewport")) {
+				addAtRuleError();
+			}
 		}
 	    skipStatement();
 	}