moved winix directories to winixd subdirectory

git-svn-id: svn://ttmath.org/publicrep/winix/trunk@1027 e52654a7-88a9-db11-a3e9-0013d4bc506e

winixd/core/rebus.cpp

@@ -0,0 +1,196 @@
+/*
+ * This file is a part of Winix
+ * and is distributed under the 2-Clause BSD licence.
+ * Author: Tomasz Sowa <t.sowa@ttmath.org>
+ */
+
+/* 
+ * Copyright (c) 2008-2014, Tomasz Sowa
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ * 
+ */
+ 
+#include <cstdlib>
+#include <limits.h>
+#include "log.h"
+#include "rebus.h"
+#include "misc.h"
+#include "cur.h"
+
+
+namespace Winix
+{
+
+
+
+
+void Rebus::SetCur(Cur * pcur)
+{
+	cur = pcur;
+}
+
+
+bool Rebus::InitPair(int a, int b, Item & item)
+{
+wchar_t buffer[100];
+size_t buffer_len = sizeof(buffer) / sizeof(wchar_t);
+bool add = false;
+
+	if( a+b <= 15 )
+	{
+		swprintf(buffer, buffer_len, L"%d+%d", a, b);
+		item.question = buffer;
+		item.answer = a+b;
+		add = true;
+	}
+
+	if( a-b >= 0 )
+	{
+		swprintf(buffer, buffer_len, L"%d-%d", a, b);
+		item.question = buffer;
+		item.answer = a-b;
+		add = true;
+	}
+
+return add;
+}
+
+
+
+void Rebus::Init()
+{
+int a, b;
+Item item;
+
+	item.key = 0;
+
+	for(a=1 ; a<10 ; ++a)
+	{
+		for(b=1 ; b<10 ; ++b)
+		{
+			if( InitPair(a, b, item) )
+			{
+				table.push_back(item);
+				item.key += 1;
+			}
+		}
+	}
+}
+
+
+Rebus::Item * Rebus::Rand()
+{
+size_t len = table.size();
+
+	if( len == 0 )
+		// empty table, call Init() first
+		return 0;
+
+	size_t i = size_t( ((double)rand()*(double)len) / (double(RAND_MAX)+1.0) );
+
+	if( i >= table.size() )
+	{
+		log << log1 << "Rebus: Rand() index too big" << logend;
+		// oops, it should not be greater then table.size()
+		return &table[0];
+	}
+
+return &table[0] + i;
+}
+
+
+
+bool Rebus::IsAnswerOk(Rebus::Item * item, const std::wstring & answer)
+{
+	if( item == 0 )
+		return false;
+
+	wchar_t * end;
+	const wchar_t * a = answer.c_str();
+	a = SkipWhite(a);
+
+	int value = (int)wcstol(a, &end, 10);
+
+	if( a == end )
+		// nothing has been read
+		return false;
+
+	log << log2 << "Rebus: your answer is: " << value << logend;
+	end = (wchar_t*)SkipWhite(end);
+
+	if( *end != 0 )
+	{
+		// something is at the end
+		return false;
+	}
+
+	bool result = (item->answer == value);
+
+	if( result )
+		log << log3 << "Rebus: the answer is correct" << logend;
+
+return result;
+}
+
+
+
+bool Rebus::CheckRebus()
+{
+	if( !cur->session )
+		return false;
+
+	if( cur->session->puser )
+		// logged users don't have to use the rebus
+		return true;
+
+	if( cur->session->rebus_checked )
+		return true;
+
+	cur->session->rebus_checked = true;
+
+	if( !cur->session->rebus_item )
+	{
+		log << log1 << "Rebus: rebus not set" << logend;
+		return false;
+	}
+
+	if( IsAnswerOk(cur->session->rebus_item, cur->request->PostVar(L"rebus")) )
+		return true;
+
+	log << log1 << "Rebus: rebus has an incorrect answer, expected: "
+		<< cur->session->rebus_item->answer << logend;
+
+	// don't add cur->session->spam_score when the rebus has incorrect answer
+	// a user could have made a mistake
+
+return false;
+}
+
+
+
+
+
+} // namespace Winix
+