String.h

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#ifndef _LIMBO_STRING_STRING
#define _LIMBO_STRING_STRING

#include <iostream>
#include <string>
#include <cctype>
#include <limbo/string/ToString.h>

namespace limbo 
{ 

using std::cout;
using std::endl;
using std::string;

inline bool is_integer(string const& s)
{
    if (s.empty()) return false;
    for (string::const_iterator it = s.begin(); it != s.end(); ++it)
    {
        if (!isdigit(*it)) return false;
    }
    return true;
}

inline bool is_float(string const& s)
{
    if (s.empty()) return false;
    short dp_cnt = 0; // count how many times the decimal point appears 
                    // if it appears more than 1, then s is not a floating point number 
    for (string::const_iterator it = s.begin(); it != s.end(); ++it)
    {
        if (!isdigit(*it))
        {
            if (*it == '.' && dp_cnt < 1) // dp_cnt should be <= 1 
                ++dp_cnt;
            else return false;
        }
    }
    // for floating point we assume decimal point should be there 
    return dp_cnt == 1;
}

inline bool is_number(string const& s)
{
    if (s.empty()) return false;
    short dp_cnt = 0; // count how many times the decimal point appears 
                    // if it appears more than 1, then s is not a floating point number 
    for (string::const_iterator it = s.begin(); it != s.end(); ++it)
    {
        if (!isdigit(*it))
        {
            if (*it == '.' && dp_cnt < 1) // dp_cnt should be <= 1 
                ++dp_cnt;
            else return false;
        }
    }
    // no requirement for floating point here 
    return true;
}

inline string toupper(string const& s)
{
    string s_up;
    s_up.reserve(s.size());
    for (string::const_iterator it = s.begin(); it != s.end(); ++it)
        s_up.push_back(::toupper(*it));
    return s_up;
}

inline string tolower(string const& s)
{
    string s_low;
    s_low.reserve(s.size());
    for (string::const_iterator it = s.begin(); it != s.end(); ++it)
        s_low.push_back(::tolower(*it));
    return s_low;
}

inline bool iequals(string const& s1, string const& s2)
{
    string s1_up = toupper(s1);
    string s2_up = toupper(s2);
    return s1_up == s2_up;
}

inline string get_file_path(const string& s)
{
    size_t found = s.rfind('/');
    if (found != string::npos) return s.substr(0, found);
    else return ".";
}
inline string get_file_name(const string& s)
{
    size_t found = s.rfind('/');
    if (found != string::npos) return s.substr(found+1);
    else return s;
}
inline string get_file_suffix(const string& s)
{
    size_t found = s.rfind('.');
    if (found != string::npos) return s.substr(found+1);
    else return string("");
}
inline string trim_file_suffix(string const& s)
{
    size_t found = s.rfind('.');
    if (found != string::npos) return s.substr(0, found);
    else return s;
}
inline string get_first_word(string const& str)
{
    size_t pos1 = std::string::npos;
    size_t pos2 = std::string::npos;
    for (size_t i = 0; i < str.size(); i++)
    {
        if (pos1 == std::string::npos && str[i] != ' ' && str[i] != '\t')
            pos1 = i;
        else if (pos1 != std::string::npos && (str[i] == ' ' || str[i] == '\t'))
        {
            pos2 = i;
            break;
        }
    }
    return str.substr(pos1, pos2 - pos1);
}

} // namespace limbo 

#endif