Fix str.split and add some test cases for it

src/runtime/float.cpp

@@ -453,7 +453,7 @@ Box* floatNew2(BoxedClass *cls, Box* a) {
         if (s == "-inf")
             return boxFloat(-INFINITY);
 
-        RELEASE_ASSERT(0, "%s", s.c_str());
+        return boxFloat(strtod(s.c_str(), NULL));
     }
     RELEASE_ASSERT(0, "%s", getTypeName(a)->c_str());
 }

src/runtime/str.cpp

@@ -330,12 +330,18 @@ Box* strSplit1(BoxedString* self) {
 
     std::ostringstream os("");
     for (char c : self->s) {
-        if (c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '\f') {
-            listAppendInternal(rtn, boxString(os.str()));
-            os.str("");
+        if (c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '\f' || c == '\v') {
+            if (os.tellp()) {
+                listAppendInternal(rtn, boxString(os.str()));
+                os.str("");
+            }
+        } else {
+            os << c;
         }
     }
-    listAppendInternal(rtn, boxString(os.str()));
+    if (os.tellp()) {
+        listAppendInternal(rtn, boxString(os.str()));
+    }
     return rtn;
 }
 

test/tests/str_functions.py

@@ -4,3 +4,7 @@ print repr(chr(0) + chr(180))
 print repr('"')
 # print repr("'") // don't feel like handling this right now; this should print out (verbatim) "'", ie realize it can use double quotes
 print repr("'\"")
+
+print "hello world\tmore\nwords\va\fb\ao".split()
+print "  test  ".split()
+# print "  test  ".split(' ')