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utils.cpp
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utils.cpp
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#include "utils.h"
void trim(string & text)
{
static const bool trace = 0;
static const string white = " \t";
if(trace) cout << "\ntrim{\n" << "text: " << text << "\n";
size_t begin = text.find_first_not_of(white);
if(trace) cout << "\ntrim 1\n" << "begin: " << begin << "\n";
if(begin != string::npos)
{
size_t end = text.find_last_not_of(white);
if(trace) cout << "\ntrim 2\n" << "end: " << end << "\n";
text.substr(begin, end - begin + 1).swap(text);
}
if(trace) cout << "\n}trim\n";
}
//----------------------------------------------------------------
void toLower(string & text)
{
for(unsigned i = 0; i < text.size(); ++i)
{
text[i] = tolower(text[i]);
}
}
//----------------------------------------------------------------
bool startsWith(const string & text, const string & begin)
{
static const bool trace = false;
if(trace) cout << "\nA\n";
if(text.size() < begin.size())
{
return false;
}
if(trace) cout << "\nB\n";
for(unsigned i = 0; i < begin.size(); ++i)
{
if(trace) cout << "\nC\n";
if(trace) cout << char(text[i]);
if(trace) cout << char(begin[i]);
if(trace) cout << char(tolower(text[i]));
if(trace) cout << char(tolower(begin[i]));
if(tolower(text[i]) != tolower(begin[i]))
{
return false;
}
if(trace) cout << "\nD\n";
}
if(trace) cout << "\nE\n";
return true;
}
//----------------------------------------------------------------
size_t opening(const string & text, const int & endiec)
{
int zamkniete = 0;
size_t pozycja = endiec;
while(pozycja >= 0)
{
switch(text[pozycja])
{
case '(':
zamkniete--;
if(zamkniete == 0)
{
return pozycja;
}
break;
case ')':
zamkniete++;
break;
}
pozycja--;
}
return string::npos;
}
//----------------------------------------------------------------
string lewyArgument(const string & text)
{
if(text.empty())
{
return "";
}
if(text[text.size() - 1] == ')')
{
size_t pozycja = opening(text, text.size() - 1);
return text.substr(pozycja);
}
else
{
size_t pozycja = text.find_last_of("*/+-()");
return text.substr(pozycja + 1);
}
}
//----------------------------------------------------------------
size_t closure(const string & text, const int & begin)
{
int otwarte = 0;
size_t pozycja = begin;
while(pozycja < text.size())
{
switch(text[pozycja])
{
case '(':
otwarte++;
break;
case ')':
otwarte--;
if(otwarte == 0)
{
return pozycja;
}
break;
}
pozycja++;
}
return string::npos;
}
//----------------------------------------------------------------
string prawyArgument(const string & text)
{
if(text.empty())
{
return "";
}
if(text[0] == '(')
{
size_t pozycja = closure(text, 0);
return text.substr(0, pozycja);
}
else
{
size_t pozycja = text.find_first_of("*/+-()");
return text.substr(0, pozycja - 1);
}
}
//----------------------------------------------------------------
string parse(string text)
{
static const bool trace = 0;
for(unsigned i = 0; i < text.size(); ++i)
{
if(trace) cout << "text[" << i << "]: " << text[i] << "\n";
if(text[i] == '*' && i + 1 < text.size() && text[i + 1] == '*')
{
string lewo = text.substr(0, i - 1);
string prawo = text.substr(i + 2);
if(trace) cout << " na lewo: " << lewo << "\n";
if(trace) cout << " ^ " << "\n";
if(trace) cout << "na prawo: " << prawo << "\n";
string lewy = lewyArgument(lewo);
string prawy = prawyArgument(prawo);
if(trace) cout << "lewy: " << lewy << "\n";
if(trace) cout << "prawy: " << prawy << "\n";
string potega = "pow(" + lewy + ", " + prawy + ")";
if(trace) cout << potega << "\n";
string resztaL = text.substr(0, i - lewy.size() - 1);
string resztaP = text.substr(i + 2 + prawy.size());
if(trace) cout << "resztaL: " << resztaL << "\n";
if(trace) cout << "resztaP: " << resztaP << "\n";
if(trace) cout << resztaL << potega << resztaP << "\n";
text = resztaL + potega + resztaP;
i = resztaL.size() + potega.size();
}
}
return text;
}
//----------------------------------------------------------------