rainmeter-studio/Library/MeasureCalc.cpp

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/*
Copyright (C) 2004 Kimmo Pekkola
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "StdAfx.h"
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#include "MeasureCalc.h"
#include "Rainmeter.h"
#include <cstdlib>
#include <ctime>
#include <sstream>
using namespace std;
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hqStrMap* CMeasureCalc::c_VarMap = NULL;
bool CMeasureCalc::c_RandSeeded = false;
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/*
** CMeasureCalc
**
** The constructor
**
*/
CMeasureCalc::CMeasureCalc(CMeterWindow* meterWindow) : CMeasure(meterWindow)
{
if(!c_RandSeeded)
{
c_RandSeeded = true;
srand((unsigned)time(0));
}
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m_Parser = MathParser_Create(NULL);
m_LowBound = 0;
m_HighBound = 100;
m_UpdateRandom = false;
rand();
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}
/*
** ~CMeasureCalc
**
** The destructor
**
*/
CMeasureCalc::~CMeasureCalc()
{
MathParser_Destroy(m_Parser);
if (c_VarMap)
{
StrMap_Destroy(c_VarMap);
c_VarMap = NULL;
}
}
/*
** Update
**
** Updates the calculation
**
*/
bool CMeasureCalc::Update()
{
if (!CMeasure::PreUpdate()) return false;
m_Parser->Parameters = c_VarMap;
if (m_UpdateRandom)
{
FormulaReplace();
}
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char* errMsg = MathParser_Parse(m_Parser, ConvertToAscii(m_Formula.c_str()).c_str(), &m_Value);
if (errMsg != NULL)
{
DebugLog(ConvertToWide(errMsg).c_str());
}
return PostUpdate();
}
void CMeasureCalc::UpdateVariableMap(CMeterWindow& meterWindow)
{
// Delete the old map
if (c_VarMap)
{
StrMap_Destroy(c_VarMap);
c_VarMap = NULL;
}
// Create the variable map
c_VarMap = Strmap_Create(sizeof(double), 0);
std::list<CMeasure*>& measures = meterWindow.GetMeasures();
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std::list<CMeasure*>::const_iterator iter = measures.begin();
for( ; iter != measures.end(); ++iter)
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{
const char* name = (*iter)->GetANSIName();
double val = (*iter)->GetValue();
StrMap_AddString(c_VarMap, name, &val);
}
// Add the counter
double counter = meterWindow.GetUpdateCounter();
StrMap_AddString(c_VarMap, "Counter", &counter);
}
/*
** ReadConfig
**
** Reads the measure specific configs.
**
*/
void CMeasureCalc::ReadConfig(CConfigParser& parser, const WCHAR* section)
{
CMeasure::ReadConfig(parser, section);
// Store the current values so we know if the value needs to be updated
int oldLowBound = m_LowBound;
int oldHighBound = m_HighBound;
bool oldUpdateRandom = m_UpdateRandom;
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m_Formula = parser.ReadString(section, L"Formula", L"");
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m_LowBound = parser.ReadInt(section, L"LowBound", 0);
m_HighBound = parser.ReadInt(section, L"HighBound", 100);
m_UpdateRandom = 0!=parser.ReadInt(section, L"UpdateRandom", 0);
if (!m_Initialized ||
m_FormulaHolder != m_Formula ||
oldLowBound != m_LowBound ||
oldHighBound != m_HighBound ||
oldUpdateRandom != m_UpdateRandom)
{
// Hold onto the formula, we are going to change it
m_FormulaHolder = m_Formula;
if (!m_UpdateRandom)
{
FormulaReplace();
}
}
}
/*
** FormulaReplace
**
** This replaces the word Random in m_Formula with a random number
**
*/
void CMeasureCalc::FormulaReplace()
{
//To implement random numbers the word "Random" in the string
//formula is being replaced by the random number value
m_Formula = m_FormulaHolder;
std::wstring::size_type loc = 0;
while ((loc = m_Formula.find_first_of(L"Rr", loc)) != std::wstring::npos)
{
if (wcsnicmp(L"Random", m_Formula.c_str() + loc, 6) == 0 &&
(loc == 0 || IsDelimiter(*(m_Formula.c_str() + loc - 1))) &&
(loc == (m_Formula.length() - 6) || IsDelimiter(*(m_Formula.c_str() + loc + 6))))
{
int range = (m_HighBound - m_LowBound) + 1;
srand((unsigned) rand());
int randNumber = m_LowBound + (int)(range * rand()/(RAND_MAX + 1.0));
WCHAR buffer[32];
wsprintf(buffer, L"%i", randNumber);
m_Formula.replace(loc, 6, buffer);
loc += wcslen(buffer);
}
else
{
++loc;
}
}
}
/*
** IsDelimiter
**
** Checks whether the given character is a operator or a delimiter.
**
*/
bool CMeasureCalc::IsDelimiter(WCHAR ch)
{
const WCHAR symbols[] = L" \t\n()+-/*^~<>%$,?:=&|;";
for (size_t i = 0, len = wcslen(symbols); i < len; ++i)
{
if (ch == symbols[i])
{
return true;
}
}
return false;
}