implement RegExpEngineAccess

Author: rbri

src/main/java/org/htmlunit/corejs/javascript/regexp/RegExpEngineAccess.java

@@ -0,0 +1,34 @@
+package org.htmlunit.corejs.javascript.regexp;
+
+import org.htmlunit.corejs.javascript.Context;
+
+/**
+ * Simple wrapper to to use the RegExp engine without js.
+ * This is required for implementing input validation.
+ *
+ * @author Ronald Brill
+ */
+public class RegExpEngineAccess {
+
+    public static final class CompiledRegExp {
+        private final RECompiled reCompiled_;
+
+        public CompiledRegExp(final RECompiled reCompiled) {
+            reCompiled_ = reCompiled;
+        }
+    }
+
+    public static CompiledRegExp compile(final Context cx, final String regExp, final String regExpArgs) {
+        final RECompiled reCompiled = NativeRegExp.compileRE(cx, regExp, regExpArgs, false);
+        return new CompiledRegExp(reCompiled);
+    }
+
+    public static boolean matches(final Context cx, final String input, final CompiledRegExp compiledRegExp) {
+        boolean matches = NativeRegExp.matchRegExp(cx,
+                                new REGlobalData(),
+                                compiledRegExp.reCompiled_,
+                                input, 0, input.length(),
+                                false);
+        return matches;
+    }
+}

src/test/java/org/htmlunit/corejs/javascript/regexp/RegExpImplStandaloneTest.java

@@ -0,0 +1,35 @@
+package org.htmlunit.corejs.javascript.regexp;
+
+import org.htmlunit.corejs.javascript.Context;
+import org.htmlunit.corejs.javascript.regexp.NativeRegExp;
+import org.htmlunit.corejs.javascript.regexp.RECompiled;
+import org.htmlunit.corejs.javascript.regexp.REGlobalData;
+import org.junit.Assert;
+import org.junit.jupiter.api.Test;
+
+/**
+ * Tests to use the RegExp engine without js. This is required
+ * for implementing input validation.
+ *
+ * @author Ronald Brill
+ */
+public class RegExpImplStandaloneTest {
+
+    /**
+     * @throws Exception if the test fails
+     */
+    @Test
+    public void testChangeAttributesFromSubclass() throws Exception {
+        Context cx = new Context() {};
+
+        String regExp = "^(?:HtmlU[i-t]*)$";
+        String regExpArgs = ""; // v
+
+
+        RegExpEngineAccess.CompiledRegExp compiled = RegExpEngineAccess.compile(cx, regExp, regExpArgs);
+
+        String experiment = "HtmlUniiiiiot";
+        final boolean matches = RegExpEngineAccess.matches(cx, experiment, compiled);
+        Assert.assertTrue(matches);
+    }
+}