better error handling

Author: rbri

src/main/java/com/gargoylesoftware/css/dom/CSSPageRuleImpl.java

@@ -21,6 +21,7 @@
 import com.gargoylesoftware.css.parser.CSSException;
 import com.gargoylesoftware.css.parser.CSSOMParser;
 import com.gargoylesoftware.css.util.LangUtils;
+import com.gargoylesoftware.css.util.ThrowCssExceptionErrorHandler;
 
 /**
  * Implementation of CSSPageRule.
@@ -80,6 +81,7 @@ public String getCssText() {
     public void setCssText(final String cssText) throws DOMException {
         try {
             final CSSOMParser parser = new CSSOMParser();
+            parser.setErrorHandler(ThrowCssExceptionErrorHandler.INSTANCE);
             final AbstractCSSRuleImpl r = parser.parseRule(cssText);
 
             // The rule must be a page rule
@@ -124,6 +126,7 @@ public String getSelectorText() {
     public void setSelectorText(final String selectorText) throws DOMException {
         try {
             final CSSOMParser parser = new CSSOMParser();
+            parser.setErrorHandler(ThrowCssExceptionErrorHandler.INSTANCE);
             final AbstractCSSRuleImpl r = parser.parseRule("@page " + selectorText + " {}");
 
             // The rule must be a page rule

src/test/java/com/gargoylesoftware/css/dom/CSSPageRuleImplTest.java

@@ -104,7 +104,7 @@ public void setSelectorTextInvalid() throws Exception {
             fail("DOMException expected");
         }
         catch (final DOMException e) {
-            assertTrue(e.getMessage().startsWith("The text does not represent a page rule (null)"), e.getMessage());
+            assertTrue(e.getMessage().startsWith("Syntax error"), e.getMessage());
         }
         assertEquals("", value.getSelectorText());
         assertEquals("@page { color: blue; }", value.getCssText());