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Parse command line and some utility functions

Posted on | August 9, 2007 |

I was assigned to write a dictionary module for a huge MFC project. The library as well as the executable has to be fully compliance with standard c++.

Now, I have to write a parser. I know I don’t really have to write one, as there is already many out in the net. Why to make the wheel again ? Well known answer — as I can :)

//Declare
wstring CLGetKeyValue(wstring cl ,wstring key, wstring::size_type pos=0);
void ParseCommandLine(wstring cl,wstring::size_type pos=0);

std::map <wstring,wstring> tb;



//this is for parsing

void ParseCommandLine(wstring cl,wstring::size_type pos)

{

wstring::size_type p1 = cl.find(L“-”,pos);

if((int)p1 < style="">

return;

wstring::size_type p2 = cl.find(L” -”,p1+1);

if((int)p2 < style="">

p2 = cl.length();

wstring pair = cl.substr(p1,(p2-p1));

int mid = (int)pair.find(L” “);

tb.insert(make_pair(pair.substr(1,mid-1),pair.substr(mid+1,pair.length()))) ;

ParseCommandLine(cl,p2);

}

//This checks the presence of a key

inline int CLHasKey(wstring cl,wstring key)

{

if((int)cl.find(L“-”+key+L” “) < style="">

return 0;

return 1;

}

//It returns the key value, assumed that the key is present

wstring CLGetKeyValue(wstring cl, wstring key, wstring::size_type pos)

{

//should be checked CLHasKey(cl,key);

wstring::size_type p1 = cl.find(L“-”,pos);

if((int)p1 < style="">

return L“”;

wstring::size_type p2 = cl.find(L” -”,p1+1);

if((int)p2 < style="">

p2 = cl.length();

wstring pair = cl.substr(p1,(p2-p1));

int mid = (int)pair.find(L” “);

if( key.compare(pair.substr(1,mid-1)) ==0 )

{

return pair.substr(mid+1,pair.length());

}

return CLGetKeyValue(cl,key,p2);

}

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