OpenMW/components/misc/stringops.hpp

#ifndef MISC_STRINGOPS_H
#define MISC_STRINGOPS_H

#include <cctype>
#include <string>
#include <algorithm>

namespace Misc
{
class StringUtils
{
    struct ci
    {
        bool operator()(char x, char y) const {
            return tolower(x) < tolower(y);
        }
    };

public:
    static bool ciLess(const std::string &x, const std::string &y) {
        return std::lexicographical_compare(x.begin(), x.end(), y.begin(), y.end(), ci());
    }

    static bool ciEqual(const std::string &x, const std::string &y) {
        if (x.size() != y.size()) {
            return false;
        }
        std::string::const_iterator xit = x.begin();
        std::string::const_iterator yit = y.begin();
        for (; xit != x.end(); ++xit, ++yit) {
            if (tolower(*xit) != tolower(*yit)) {
                return false;
            }
        }
        return true;
    }

    static bool cEqual(const std::string &x, const std::string &y) {
        if (x.size() != y.size()) {
            return false;
        }
        std::string::const_iterator xit = x.begin();
        std::string::const_iterator yit = y.begin();
        for (; xit != x.end(); ++xit, ++yit) {
            if (*xit != *yit) {
                return false;
            }
        }
        return true;
    }

    static int ciCompareLen(const std::string &x, const std::string &y, size_t len)
    {
        std::string::const_iterator xit = x.begin();
        std::string::const_iterator yit = y.begin();
        for(;xit != x.end() && yit != y.end() && len > 0;++xit,++yit,--len)
        {
            int res = *xit - *yit;
            if(res != 0 && tolower(*xit) != tolower(*yit))
                return (res > 0) ? 1 : -1;
        }
        if(len > 0)
        {
            if(xit != x.end())
                return 1;
            if(yit != y.end())
                return -1;
        }
        return 0;
    }

    /// Transforms input string to lower case w/o copy
    static void lowerCaseInPlace(std::string &inout) {
        for (unsigned int i=0; i<inout.size(); ++i)
            inout[i] = tolower(inout[i]);
    }

    /// Returns lower case copy of input string
    static std::string lowerCase(const std::string &in)
    {
        std::string out = in;
        lowerCaseInPlace(out);
        return out;
    }
};

}

#endif