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#include <cstdlib>
#include <cstring>
#include <iostream>
#include "rangeparser.h"
using namespace std;
RangeParser::RangeParser(const char *range,int max)
: max(max), range(NULL), ptr(NULL), prev(0), target(0)
{
if(range)
this->range=strdup(range);
else
this->range=strdup("");
ptr=this->range;
while(Next());
}
RangeParser::~RangeParser()
{
if(range)
free(range);
}
int RangeParser::Next()
{
// If we're in the middle of a range, continue through the range...
if(target)
{
if(prev<target)
++prev;
else
prev=target=0;
}
if(!target)
{
// Skip over whitespace and commas.
while(*ptr==' ' || *ptr==',')
++ptr;
// Check for end of string...
// If reached, then we set the point back to the beginning;
// This allows the constructor to do a "dummy run" through the
// range, to verify that the specification is valid.
if(!*ptr)
{
ptr=range;
prev=target=0;
return(0);
}
// Find end of current number...
char *p2=ptr;
if(*p2<'0' || *p2>'9')
throw "Bad range specified";
while(*p2>='0' && *p2<='9')
++p2;
// Replace character after number with 0, temporarily...
char tmp=*p2;
prev=atoi(ptr);
*p2=tmp;
while(*p2!=0 && *p2==' ')
++p2;
ptr=p2;
// Is a range specified?
if(*ptr=='-')
{
++ptr;
// Skip over whitespace
while(*ptr==' ' || *ptr==',')
++ptr;
p2=ptr;
if(!*ptr)
target=max;
else
{
if(*p2<'0' || *p2>'9')
throw "Bad range specified";
while(*p2>='0' && *p2<='9')
++p2;
// Replace character after number with 0, temporarily...
char tmp=*p2;
target=atoi(ptr);
*p2=tmp;
}
ptr=p2;
}
}
if(max>0 && prev>max)
throw "Bad range specified";
return(prev);
}
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