strip

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// Copyright (C) 2010, Guy Barrand. All rights reserved.
// See the file tools.license for terms.
 
#ifndef tools_strip
#define tools_strip
 
#include <vector>
#include <string>
 
namespace tools {
 
enum what { leading, trailing, both };
 
inline bool strip(std::string& a_string,what a_type = both,char a_char = ' '){
  //return true = some stripping had been done.
 
  std::string::size_type l = a_string.length();
  if(l==0) return false;
 
  switch ( a_type ) {
  case leading:{
    char* pos = (char*)a_string.c_str();
    for(std::string::size_type i=0;i<l;i++,pos++) {
      if(*pos!=a_char) {
        a_string = a_string.substr(i,l-i);
        return (i?true:false); //i=0 : same string.
      }
    }
    // all chars are a_char :
    a_string.clear();
    return true;
    }break;
  case trailing:{
    char* pos = (char*)a_string.c_str();
    pos += (l-1);
    std::string::size_type i = l-1;
    std::string::const_reverse_iterator it;
    for(it=a_string.rbegin();it!=a_string.rend();++it,i--,pos--) {
      if(*pos!=a_char) {
        a_string = a_string.substr(0,i+1);
        return (i==(l-1)?false:true); //i==l-1 : same string.
      }
    }
    // all chars are a_char :
    a_string.clear();
    return true;
    }break;
  case both:{
    bool stat_lead = strip(a_string,leading,a_char);
    bool stat_trail = strip(a_string,trailing,a_char);
    if(stat_lead) return true;
    if(stat_trail) return true;
    }break;
  //default:break;
  }
  return false; //nothing done.
}
 
#ifdef TOOLS_DEPRECATED
inline std::string strp(const std::string& a_string,what a_type = both,char a_char = ' '){
  std::string s(a_string);
  strip(s,a_type,a_char);
  return s;
}
#endif //TOOLS_DEPRECATED
 
inline bool strip(std::vector<std::string>& a_strings,what a_type = both,char a_char = ' ') {
  bool some_done = false;
  std::vector<std::string>::iterator it;
  for(it=a_strings.begin();it!=a_strings.end();++it) {
    if(strip(*it,a_type,a_char)) some_done = true;
  }
  return some_done;
}
 
}
 
#endif