Update lastIndex handling in RegExpBuiltinExec (#4010)

JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai daniel.batyai@h-lab.eu

tests/jerry/es.next/regexp-lastindex.js

@@ -12,11 +12,56 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-var t = new RegExp ("abc","g");
-t.lastIndex = -12;
+var t = /abc/g;
+t.lastIndex = -12.5;
 result = t.exec("abc   abc");
 assert(result[0] === "abc");
 assert(result.index === 0);
 assert(t.lastIndex === 3);
 
 assert(RegExp.prototype.lastIndex === undefined)
+
+var r = /./y
+r.lastIndex = -1;
+assert (JSON.stringify(r.exec("abca")) === '["a"]');
+assert (r.lastIndex === 1);
+assert (JSON.stringify(r.exec("abca")) === '["b"]');
+assert (r.lastIndex === 2);
+
+r.lastIndex = 5;
+assert (JSON.stringify(r.exec("abca")) === 'null');
+assert (r.lastIndex === 0);
+
+var r = /a/y
+assert (JSON.stringify(r.exec("abca")) === '["a"]');
+assert (r.lastIndex === 1);
+assert (JSON.stringify(r.exec("abca")) === 'null');
+assert (r.lastIndex === 0);
+
+var r = /./g
+r.lastIndex = -1;
+assert (JSON.stringify(r.exec("abca")) === '["a"]');
+assert (r.lastIndex === 1);
+assert (JSON.stringify(r.exec("abca")) === '["b"]');
+assert (r.lastIndex === 2);
+
+r.lastIndex = 5;
+assert (JSON.stringify(r.exec("abca")) === 'null');
+assert (r.lastIndex === 0);
+
+var r = /a/g
+assert (JSON.stringify(r.exec("abca")) === '["a"]');
+assert (r.lastIndex === 1);
+assert (JSON.stringify(r.exec("abca")) === '["a"]');
+assert (r.lastIndex === 4);
+assert (JSON.stringify(r.exec("abca")) === 'null');
+assert (r.lastIndex === 0);
+
+var r = /./uim
+r.lastIndex = 2;
+assert (JSON.stringify(r.exec("abcd")) === '["a"]');
+assert (r.lastIndex === 2);
+
+r.lastIndex = "lastIndex";
+assert (JSON.stringify(r.exec("abcd")) === '["a"]');
+assert (r.lastIndex === "lastIndex");

tests/jerry/es5.1/regexp-lastindex.js

@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-var t = new RegExp ("abc","g");
-t.lastIndex = -12;
+var t = /abc/g;
+t.lastIndex = -12.5;
 result = t.exec("abc   abc");
 assert(!result);
 assert(t.lastIndex === 0);

tests/jerry/regexp-routines.js

@@ -101,3 +101,17 @@ assert (re2.ignoreCase === re1.ignoreCase);
 assert (re2.multiline === re1.multiline);
 assert (re2.source === re1.source);
 assert (re2.lastIndex === 0);
+
+var r = /./
+r.lastIndex = {
+  valueOf: function() {
+    throw "abrupt lastIndex"
+  }
+}
+
+try {
+  r.exec("a");
+  assert(false);
+} catch (e) {
+  assert (e === "abrupt lastIndex");
+}