#include "nuklear.h"
#include "nuklear_internal.h"

/* ===============================================================
 *
 *                              UTIL
 *
 * ===============================================================*/
NK_INTERN int nk_str_match_here(const char *regexp, const char *text);
NK_INTERN int nk_str_match_star(int c, const char *regexp, const char *text);
NK_LIB nk_bool nk_is_lower(int c) {return (c >= 'a' && c <= 'z') || (c >= 0xE0 && c <= 0xFF);}
NK_LIB nk_bool nk_is_upper(int c){return (c >= 'A' && c <= 'Z') || (c >= 0xC0 && c <= 0xDF);}
NK_LIB int nk_to_upper(int c) {return (c >= 'a' && c <= 'z') ? (c - ('a' - 'A')) : c;}
NK_LIB int nk_to_lower(int c) {return (c >= 'A' && c <= 'Z') ? (c - ('a' + 'A')) : c;}

#ifdef NK_MEMCPY_NEEDED
NK_LIB void*
nk_memcopy(void *dst0, const void *src0, nk_size length)
{
    nk_ptr t;
    char *dst = (char*)dst0;
    const char *src = (const char*)src0;
    if (length == 0 || dst == src)
        goto done;

    #define nk_word int
    #define nk_wsize sizeof(nk_word)
    #define nk_wmask (nk_wsize-1)
    #define NK_TLOOP(s) if (t) NK_TLOOP1(s)
    #define NK_TLOOP1(s) do { s; } while (--t)

    if (dst < src) {
        t = (nk_ptr)src; /* only need low bits */
        if ((t | (nk_ptr)dst) & nk_wmask) {
            if ((t ^ (nk_ptr)dst) & nk_wmask || length < nk_wsize)
                t = length;
            else
                t = nk_wsize - (t & nk_wmask);
            length -= t;
            NK_TLOOP1(*dst++ = *src++);
        }
        t = length / nk_wsize;
        NK_TLOOP(*(nk_word*)(void*)dst = *(const nk_word*)(const void*)src;
            src += nk_wsize; dst += nk_wsize);
        t = length & nk_wmask;
        NK_TLOOP(*dst++ = *src++);
    } else {
        src += length;
        dst += length;
        t = (nk_ptr)src;
        if ((t | (nk_ptr)dst) & nk_wmask) {
            if ((t ^ (nk_ptr)dst) & nk_wmask || length <= nk_wsize)
                t = length;
            else
                t &= nk_wmask;
            length -= t;
            NK_TLOOP1(*--dst = *--src);
        }
        t = length / nk_wsize;
        NK_TLOOP(src -= nk_wsize; dst -= nk_wsize;
            *(nk_word*)(void*)dst = *(const nk_word*)(const void*)src);
        t = length & nk_wmask;
        NK_TLOOP(*--dst = *--src);
    }
    #undef nk_word
    #undef nk_wsize
    #undef nk_wmask
    #undef NK_TLOOP
    #undef NK_TLOOP1
done:
    return (dst0);
}
#endif
#ifdef NK_MEMSET_NEEDED
NK_LIB void
nk_memset(void *ptr, int c0, nk_size size)
{
    #define nk_word unsigned
    #define nk_wsize sizeof(nk_word)
    #define nk_wmask (nk_wsize - 1)
    nk_byte *dst = (nk_byte*)ptr;
    unsigned c = 0;
    nk_size t = 0;

    if ((c = (nk_byte)c0) != 0) {
        c = (c << 8) | c; /* at least 16-bits  */
        if (sizeof(unsigned int) > 2)
            c = (c << 16) | c; /* at least 32-bits*/
    }

    /* too small of a word count */
    dst = (nk_byte*)ptr;
    if (size < 3 * nk_wsize) {
        while (size--) *dst++ = (nk_byte)c0;
        return;
    }

    /* align destination */
    if ((t = NK_PTR_TO_UINT(dst) & nk_wmask) != 0) {
        t = nk_wsize -t;
        size -= t;
        do {
            *dst++ = (nk_byte)c0;
        } while (--t != 0);
    }

    /* fill word */
    t = size / nk_wsize;
    do {
        *(nk_word*)((void*)dst) = c;
        dst += nk_wsize;
    } while (--t != 0);

    /* fill trailing bytes */
    t = (size & nk_wmask);
    if (t != 0) {
        do {
            *dst++ = (nk_byte)c0;
        } while (--t != 0);
    }

    #undef nk_word
    #undef nk_wsize
    #undef nk_wmask
}
#endif
NK_LIB void
nk_zero(void *ptr, nk_size size)
{
    NK_ASSERT(ptr);
    NK_MEMSET(ptr, 0, size);
}
NK_API int
nk_strlen(const char *str)
{
    int siz = 0;
    NK_ASSERT(str);
    while (str && *str++ != '\0') siz++;
    return siz;
}
NK_API int
nk_strtoi(const char *str, char **endptr)
{
    int neg = 1;
    const char *p = str;
    int value = 0;

    NK_ASSERT(str);
    if (!str) return 0;

    /* skip whitespace */
    while (*p == ' ') p++;
    if (*p == '-') {
        neg = -1;
        p++;
    }
    while (*p && *p >= '0' && *p <= '9') {
        value = value * 10 + (int) (*p - '0');
        p++;
    }
    if (endptr)
        *endptr = (char *)p;
    return neg*value;
}
#ifdef NK_STRTOD_NEEDED
NK_API double
nk_strtod(const char *str, char **endptr)
{
    double m;
    double neg = 1.0;
    char *p = (char *)str;
    double value = 0;
    double number = 0;

    NK_ASSERT(str);
    if (!str) return 0;

    /* skip whitespace */
    while (*p == ' ') p++;
    if (*p == '-') {
        neg = -1.0;
        p++;
    }

    while (*p && *p != '.' && *p != 'e') {
        value = value * 10.0 + (double) (*p - '0');
        p++;
    }

    if (*p == '.') {
        p++;
        for(m = 0.1; *p && *p != 'e'; p++ ) {
            value = value + (double) (*p - '0') * m;
            m *= 0.1;
        }
    }
    if (*p == 'e') {
        int i, pow, div;
        p++;
        if (*p == '-') {
            div = nk_true;
            p++;
        } else if (*p == '+') {
            div = nk_false;
            p++;
        } else div = nk_false;

        for (pow = 0; *p; p++)
            pow = pow * 10 + (int) (*p - '0');

        for (m = 1.0, i = 0; i < pow; i++)
            m *= 10.0;

        if (div)
            value /= m;
        else value *= m;
    }
    number = value * neg;
    if (endptr)
        *endptr = (char *)p;
    return number;
}
#endif
NK_API float
nk_strtof(const char *str, char **endptr)
{
    float float_value;
    double double_value;
    double_value = NK_STRTOD(str, endptr);
    float_value = (float)double_value;
    return float_value;
}
NK_API int
nk_stricmp(const char *s1, const char *s2)
{
    nk_int c1,c2,d;
    do {
        c1 = *s1++;
        c2 = *s2++;
        d = c1 - c2;
        while (d) {
            if (c1 <= 'Z' && c1 >= 'A') {
                d += ('a' - 'A');
                if (!d) break;
            }
            if (c2 <= 'Z' && c2 >= 'A') {
                d -= ('a' - 'A');
                if (!d) break;
            }
            return ((d >= 0) << 1) - 1;
        }
    } while (c1);
    return 0;
}
NK_API int
nk_stricmpn(const char *s1, const char *s2, int n)
{
    int c1,c2,d;
    NK_ASSERT(n >= 0);
    do {
        c1 = *s1++;
        c2 = *s2++;
        if (!n--) return 0;

        d = c1 - c2;
        while (d) {
            if (c1 <= 'Z' && c1 >= 'A') {
                d += ('a' - 'A');
                if (!d) break;
            }
            if (c2 <= 'Z' && c2 >= 'A') {
                d -= ('a' - 'A');
                if (!d) break;
            }
            return ((d >= 0) << 1) - 1;
        }
    } while (c1);
    return 0;
}
NK_INTERN int
nk_str_match_here(const char *regexp, const char *text)
{
    if (regexp[0] == '\0')
        return 1;
    if (regexp[1] == '*')
        return nk_str_match_star(regexp[0], regexp+2, text);
    if (regexp[0] == '$' && regexp[1] == '\0')
        return *text == '\0';
    if (*text!='\0' && (regexp[0]=='.' || regexp[0]==*text))
        return nk_str_match_here(regexp+1, text+1);
    return 0;
}
NK_INTERN int
nk_str_match_star(int c, const char *regexp, const char *text)
{
    do {/* a '* matches zero or more instances */
        if (nk_str_match_here(regexp, text))
            return 1;
    } while (*text != '\0' && (*text++ == c || c == '.'));
    return 0;
}
NK_API int
nk_strfilter(const char *text, const char *regexp)
{
    /*
    c    matches any literal character c
    .    matches any single character
    ^    matches the beginning of the input string
    $    matches the end of the input string
    *    matches zero or more occurrences of the previous character*/
    if (regexp[0] == '^')
        return nk_str_match_here(regexp+1, text);
    do {    /* must look even if string is empty */
        if (nk_str_match_here(regexp, text))
            return 1;
    } while (*text++ != '\0');
    return 0;
}
NK_API int
nk_strmatch_fuzzy_text(const char *str, int str_len,
    const char *pattern, int *out_score)
{
    /* Returns true if each character in pattern is found sequentially within str
     * if found then out_score is also set. Score value has no intrinsic meaning.
     * Range varies with pattern. Can only compare scores with same search pattern. */

    /* bonus for adjacent matches */
    #define NK_ADJACENCY_BONUS 5
    /* bonus if match occurs after a separator */
    #define NK_SEPARATOR_BONUS 10
    /* bonus if match is uppercase and prev is lower */
    #define NK_CAMEL_BONUS 10
    /* penalty applied for every letter in str before the first match */
    #define NK_LEADING_LETTER_PENALTY (-3)
    /* maximum penalty for leading letters */
    #define NK_MAX_LEADING_LETTER_PENALTY (-9)
    /* penalty for every letter that doesn't matter */
    #define NK_UNMATCHED_LETTER_PENALTY (-1)

    /* loop variables */
    int score = 0;
    char const * pattern_iter = pattern;
    int str_iter = 0;
    int prev_matched = nk_false;
    int prev_lower = nk_false;
    /* true so if first letter match gets separator bonus*/
    int prev_separator = nk_true;

    /* use "best" matched letter if multiple string letters match the pattern */
    char const * best_letter = 0;
    int best_letter_score = 0;

    /* loop over strings */
    NK_ASSERT(str);
    NK_ASSERT(pattern);
    if (!str || !str_len || !pattern) return 0;
    while (str_iter < str_len)
    {
        const char pattern_letter = *pattern_iter;
        const char str_letter = str[str_iter];

        int next_match = *pattern_iter != '\0' &&
            nk_to_lower(pattern_letter) == nk_to_lower(str_letter);
        int rematch = best_letter && nk_to_upper(*best_letter) == nk_to_upper(str_letter);

        int advanced = next_match && best_letter;
        int pattern_repeat = best_letter && *pattern_iter != '\0';
        pattern_repeat = pattern_repeat &&
            nk_to_lower(*best_letter) == nk_to_lower(pattern_letter);

        if (advanced || pattern_repeat) {
            score += best_letter_score;
            best_letter = 0;
            best_letter_score = 0;
        }

        if (next_match || rematch)
        {
            int new_score = 0;
            /* Apply penalty for each letter before the first pattern match */
            if (pattern_iter == pattern) {
                int count = (int)(&str[str_iter] - str);
                int penalty = NK_LEADING_LETTER_PENALTY * count;
                if (penalty < NK_MAX_LEADING_LETTER_PENALTY)
                    penalty = NK_MAX_LEADING_LETTER_PENALTY;

                score += penalty;
            }

            /* apply bonus for consecutive bonuses */
            if (prev_matched)
                new_score += NK_ADJACENCY_BONUS;

            /* apply bonus for matches after a separator */
            if (prev_separator)
                new_score += NK_SEPARATOR_BONUS;

            /* apply bonus across camel case boundaries */
            if (prev_lower && nk_is_upper(str_letter))
                new_score += NK_CAMEL_BONUS;

            /* update pattern iter IFF the next pattern letter was matched */
            if (next_match)
                ++pattern_iter;

            /* update best letter in str which may be for a "next" letter or a rematch */
            if (new_score >= best_letter_score) {
                /* apply penalty for now skipped letter */
                if (best_letter != 0)
                    score += NK_UNMATCHED_LETTER_PENALTY;

                best_letter = &str[str_iter];
                best_letter_score = new_score;
            }
            prev_matched = nk_true;
        } else {
            score += NK_UNMATCHED_LETTER_PENALTY;
            prev_matched = nk_false;
        }

        /* separators should be more easily defined */
        prev_lower = nk_is_lower(str_letter) != 0;
        prev_separator = str_letter == '_' || str_letter == ' ';

        ++str_iter;
    }

    /* apply score for last match */
    if (best_letter)
        score += best_letter_score;

    /* did not match full pattern */
    if (*pattern_iter != '\0')
        return nk_false;

    if (out_score)
        *out_score = score;
    return nk_true;
}
NK_API int
nk_strmatch_fuzzy_string(char const *str, char const *pattern, int *out_score)
{
    return nk_strmatch_fuzzy_text(str, nk_strlen(str), pattern, out_score);
}
NK_LIB int
nk_string_float_limit(char *string, int prec)
{
    int dot = 0;
    char *c = string;
    while (*c) {
        if (*c == '.') {
            dot = 1;
            c++;
            continue;
        }
        if (dot == (prec+1)) {
            *c = 0;
            break;
        }
        if (dot > 0) dot++;
        c++;
    }
    return (int)(c - string);
}
NK_INTERN void
nk_strrev_ascii(char *s)
{
    int len = nk_strlen(s);
    int end = len / 2;
    int i = 0;
    char t;
    for (; i < end; ++i) {
        t = s[i];
        s[i] = s[len - 1 - i];
        s[len -1 - i] = t;
    }
}
NK_LIB char*
nk_itoa(char *s, long n)
{
    long i = 0;
    if (n == 0) {
        s[i++] = '0';
        s[i] = 0;
        return s;
    }
    if (n < 0) {
        s[i++] = '-';
        n = -n;
    }
    while (n > 0) {
        s[i++] = (char)('0' + (n % 10));
        n /= 10;
    }
    s[i] = 0;
    if (s[0] == '-')
        ++s;

    nk_strrev_ascii(s);
    return s;
}
#ifdef NK_DTOA_NEEDED
NK_LIB char*
nk_dtoa(char *s, double n)
{
    int useExp = 0;
    int digit = 0, m = 0, m1 = 0;
    char *c = s;
    int neg = 0;

    NK_ASSERT(s);
    if (!s) return 0;

    if (n == 0.0) {
        s[0] = '0'; s[1] = '\0';
        return s;
    }

    neg = (n < 0);
    if (neg) n = -n;

    /* calculate magnitude */
    m = nk_log10(n);
    useExp = (m >= 14 || (neg && m >= 9) || m <= -9);
    if (neg) *(c++) = '-';

    /* set up for scientific notation */
    if (useExp) {
        if (m < 0)
           m -= 1;
        n = n / (double)nk_pow(10.0, m);
        m1 = m;
        m = 0;
    }
    if (m < 1.0) {
        m = 0;
    }

    /* convert the number */
    while (n > NK_FLOAT_PRECISION || m >= 0) {
        double weight = nk_pow(10.0, m);
        if (weight > 0) {
            double t = (double)n / weight;
            digit = nk_ifloord(t);
            n -= ((double)digit * weight);
            *(c++) = (char)('0' + (char)digit);
        }
        if (m == 0 && n > 0)
            *(c++) = '.';
        m--;
    }

    if (useExp) {
        /* convert the exponent */
        int i, j;
        *(c++) = 'e';
        if (m1 > 0) {
            *(c++) = '+';
        } else {
            *(c++) = '-';
            m1 = -m1;
        }
        m = 0;
        while (m1 > 0) {
            *(c++) = (char)('0' + (char)(m1 % 10));
            m1 /= 10;
            m++;
        }
        c -= m;
        for (i = 0, j = m-1; i<j; i++, j--) {
            /* swap without temporary */
            c[i] ^= c[j];
            c[j] ^= c[i];
            c[i] ^= c[j];
        }
        c += m;
    }
    *(c) = '\0';
    return s;
}
#endif
#ifdef NK_INCLUDE_STANDARD_VARARGS
#ifndef NK_INCLUDE_STANDARD_IO
NK_INTERN int
nk_vsnprintf(char *buf, int buf_size, const char *fmt, va_list args)
{
    enum nk_arg_type {
        NK_ARG_TYPE_CHAR,
        NK_ARG_TYPE_SHORT,
        NK_ARG_TYPE_DEFAULT,
        NK_ARG_TYPE_LONG
    };
    enum nk_arg_flags {
        NK_ARG_FLAG_LEFT = 0x01,
        NK_ARG_FLAG_PLUS = 0x02,
        NK_ARG_FLAG_SPACE = 0x04,
        NK_ARG_FLAG_NUM = 0x10,
        NK_ARG_FLAG_ZERO = 0x20
    };

    char number_buffer[NK_MAX_NUMBER_BUFFER];
    enum nk_arg_type arg_type = NK_ARG_TYPE_DEFAULT;
    int precision = NK_DEFAULT;
    int width = NK_DEFAULT;
    nk_flags flag = 0;

    int len = 0;
    int result = -1;
    const char *iter = fmt;

    NK_ASSERT(buf);
    NK_ASSERT(buf_size);
    if (!buf || !buf_size || !fmt) return 0;
    for (iter = fmt; *iter && len < buf_size; iter++) {
        /* copy all non-format characters */
        while (*iter && (*iter != '%') && (len < buf_size))
            buf[len++] = *iter++;
        if (!(*iter) || len >= buf_size) break;
        iter++;

        /* flag arguments */
        while (*iter) {
            if (*iter == '-') flag |= NK_ARG_FLAG_LEFT;
            else if (*iter == '+') flag |= NK_ARG_FLAG_PLUS;
            else if (*iter == ' ') flag |= NK_ARG_FLAG_SPACE;
            else if (*iter == '#') flag |= NK_ARG_FLAG_NUM;
            else if (*iter == '0') flag |= NK_ARG_FLAG_ZERO;
            else break;
            iter++;
        }

        /* width argument */
        width = NK_DEFAULT;
        if (*iter >= '1' && *iter <= '9') {
            char *end;
            width = nk_strtoi(iter, &end);
            if (end == iter)
                width = -1;
            else iter = end;
        } else if (*iter == '*') {
            width = va_arg(args, int);
            iter++;
        }

        /* precision argument */
        precision = NK_DEFAULT;
        if (*iter == '.') {
            iter++;
            if (*iter == '*') {
                precision = va_arg(args, int);
                iter++;
            } else {
                char *end;
                precision = nk_strtoi(iter, &end);
                if (end == iter)
                    precision = -1;
                else iter = end;
            }
        }

        /* length modifier */
        if (*iter == 'h') {
            if (*(iter+1) == 'h') {
                arg_type = NK_ARG_TYPE_CHAR;
                iter++;
            } else arg_type = NK_ARG_TYPE_SHORT;
            iter++;
        } else if (*iter == 'l') {
            arg_type = NK_ARG_TYPE_LONG;
            iter++;
        } else arg_type = NK_ARG_TYPE_DEFAULT;

        /* specifier */
        if (*iter == '%') {
            NK_ASSERT(arg_type == NK_ARG_TYPE_DEFAULT);
            NK_ASSERT(precision == NK_DEFAULT);
            NK_ASSERT(width == NK_DEFAULT);
            if (len < buf_size)
                buf[len++] = '%';
        } else if (*iter == 's') {
            /* string  */
            const char *str = va_arg(args, const char*);
            NK_ASSERT(str != buf && "buffer and argument are not allowed to overlap!");
            NK_ASSERT(arg_type == NK_ARG_TYPE_DEFAULT);
            NK_ASSERT(precision == NK_DEFAULT);
            NK_ASSERT(width == NK_DEFAULT);
            if (str == buf) return -1;
            while (str && *str && len < buf_size)
                buf[len++] = *str++;
        } else if (*iter == 'n') {
            /* current length callback */
            signed int *n = va_arg(args, int*);
            NK_ASSERT(arg_type == NK_ARG_TYPE_DEFAULT);
            NK_ASSERT(precision == NK_DEFAULT);
            NK_ASSERT(width == NK_DEFAULT);
            if (n) *n = len;
        } else if (*iter == 'c' || *iter == 'i' || *iter == 'd') {
            /* signed integer */
            long value = 0;
            const char *num_iter;
            int num_len, num_print, padding;
            int cur_precision = NK_MAX(precision, 1);
            int cur_width = NK_MAX(width, 0);

            /* retrieve correct value type */
            if (arg_type == NK_ARG_TYPE_CHAR)
                value = (signed char)va_arg(args, int);
            else if (arg_type == NK_ARG_TYPE_SHORT)
                value = (signed short)va_arg(args, int);
            else if (arg_type == NK_ARG_TYPE_LONG)
                value = va_arg(args, signed long);
            else if (*iter == 'c')
                value = (unsigned char)va_arg(args, int);
            else value = va_arg(args, signed int);

            /* convert number to string */
            nk_itoa(number_buffer, value);
            num_len = nk_strlen(number_buffer);
            padding = NK_MAX(cur_width - NK_MAX(cur_precision, num_len), 0);
            if ((flag & NK_ARG_FLAG_PLUS) || (flag & NK_ARG_FLAG_SPACE))
                padding = NK_MAX(padding-1, 0);

            /* fill left padding up to a total of `width` characters */
            if (!(flag & NK_ARG_FLAG_LEFT)) {
                while (padding-- > 0 && (len < buf_size)) {
                    if ((flag & NK_ARG_FLAG_ZERO) && (precision == NK_DEFAULT))
                        buf[len++] = '0';
                    else buf[len++] = ' ';
                }
            }

            /* copy string value representation into buffer */
            if ((flag & NK_ARG_FLAG_PLUS) && value >= 0 && len < buf_size)
                buf[len++] = '+';
            else if ((flag & NK_ARG_FLAG_SPACE) && value >= 0 && len < buf_size)
                buf[len++] = ' ';

            /* fill up to precision number of digits with '0' */
            num_print = NK_MAX(cur_precision, num_len);
            while (precision && (num_print > num_len) && (len < buf_size)) {
                buf[len++] = '0';
                num_print--;
            }

            /* copy string value representation into buffer */
            num_iter = number_buffer;
            while (precision && *num_iter && len < buf_size)
                buf[len++] = *num_iter++;

            /* fill right padding up to width characters */
            if (flag & NK_ARG_FLAG_LEFT) {
                while ((padding-- > 0) && (len < buf_size))
                    buf[len++] = ' ';
            }
        } else if (*iter == 'o' || *iter == 'x' || *iter == 'X' || *iter == 'u') {
            /* unsigned integer */
            unsigned long value = 0;
            int num_len = 0, num_print, padding = 0;
            int cur_precision = NK_MAX(precision, 1);
            int cur_width = NK_MAX(width, 0);
            unsigned int base = (*iter == 'o') ? 8: (*iter == 'u')? 10: 16;

            /* print oct/hex/dec value */
            const char *upper_output_format = "0123456789ABCDEF";
            const char *lower_output_format = "0123456789abcdef";
            const char *output_format = (*iter == 'x') ?
                lower_output_format: upper_output_format;

            /* retrieve correct value type */
            if (arg_type == NK_ARG_TYPE_CHAR)
                value = (unsigned char)va_arg(args, int);
            else if (arg_type == NK_ARG_TYPE_SHORT)
                value = (unsigned short)va_arg(args, int);
            else if (arg_type == NK_ARG_TYPE_LONG)
                value = va_arg(args, unsigned long);
            else value = va_arg(args, unsigned int);

            do {
                /* convert decimal number into hex/oct number */
                int digit = output_format[value % base];
                if (num_len < NK_MAX_NUMBER_BUFFER)
                    number_buffer[num_len++] = (char)digit;
                value /= base;
            } while (value > 0);

            num_print = NK_MAX(cur_precision, num_len);
            padding = NK_MAX(cur_width - NK_MAX(cur_precision, num_len), 0);
            if (flag & NK_ARG_FLAG_NUM)
                padding = NK_MAX(padding-1, 0);

            /* fill left padding up to a total of `width` characters */
            if (!(flag & NK_ARG_FLAG_LEFT)) {
                while ((padding-- > 0) && (len < buf_size)) {
                    if ((flag & NK_ARG_FLAG_ZERO) && (precision == NK_DEFAULT))
                        buf[len++] = '0';
                    else buf[len++] = ' ';
                }
            }

            /* fill up to precision number of digits */
            if (num_print && (flag & NK_ARG_FLAG_NUM)) {
                if ((*iter == 'o') && (len < buf_size)) {
                    buf[len++] = '0';
                } else if ((*iter == 'x') && ((len+1) < buf_size)) {
                    buf[len++] = '0';
                    buf[len++] = 'x';
                } else if ((*iter == 'X') && ((len+1) < buf_size)) {
                    buf[len++] = '0';
                    buf[len++] = 'X';
                }
            }
            while (precision && (num_print > num_len) && (len < buf_size)) {
                buf[len++] = '0';
                num_print--;
            }

            /* reverse number direction */
            while (num_len > 0) {
                if (precision && (len < buf_size))
                    buf[len++] = number_buffer[num_len-1];
                num_len--;
            }

            /* fill right padding up to width characters */
            if (flag & NK_ARG_FLAG_LEFT) {
                while ((padding-- > 0) && (len < buf_size))
                    buf[len++] = ' ';
            }
        } else if (*iter == 'f') {
            /* floating point */
            const char *num_iter;
            int cur_precision = (precision < 0) ? 6: precision;
            int prefix, cur_width = NK_MAX(width, 0);
            double value = va_arg(args, double);
            int num_len = 0, frac_len = 0, dot = 0;
            int padding = 0;

            NK_ASSERT(arg_type == NK_ARG_TYPE_DEFAULT);
            NK_DTOA(number_buffer, value);
            num_len = nk_strlen(number_buffer);

            /* calculate padding */
            num_iter = number_buffer;
            while (*num_iter && *num_iter != '.')
                num_iter++;

            prefix = (*num_iter == '.')?(int)(num_iter - number_buffer)+1:0;
            padding = NK_MAX(cur_width - (prefix + NK_MIN(cur_precision, num_len - prefix)) , 0);
            if ((flag & NK_ARG_FLAG_PLUS) || (flag & NK_ARG_FLAG_SPACE))
                padding = NK_MAX(padding-1, 0);

            /* fill left padding up to a total of `width` characters */
            if (!(flag & NK_ARG_FLAG_LEFT)) {
                while (padding-- > 0 && (len < buf_size)) {
                    if (flag & NK_ARG_FLAG_ZERO)
                        buf[len++] = '0';
                    else buf[len++] = ' ';
                }
            }

            /* copy string value representation into buffer */
            num_iter = number_buffer;
            if ((flag & NK_ARG_FLAG_PLUS) && (value >= 0) && (len < buf_size))
                buf[len++] = '+';
            else if ((flag & NK_ARG_FLAG_SPACE) && (value >= 0) && (len < buf_size))
                buf[len++] = ' ';
            while (*num_iter) {
                if (dot) frac_len++;
                if (len < buf_size)
                    buf[len++] = *num_iter;
                if (*num_iter == '.') dot = 1;
                if (frac_len >= cur_precision) break;
                num_iter++;
            }

            /* fill number up to precision */
            while (frac_len < cur_precision) {
                if (!dot && len < buf_size) {
                    buf[len++] = '.';
                    dot = 1;
                }
                if (len < buf_size)
                    buf[len++] = '0';
                frac_len++;
            }

            /* fill right padding up to width characters */
            if (flag & NK_ARG_FLAG_LEFT) {
                while ((padding-- > 0) && (len < buf_size))
                    buf[len++] = ' ';
            }
        } else {
            /* Specifier not supported: g,G,e,E,p,z */
            NK_ASSERT(0 && "specifier is not supported!");
            return result;
        }
    }
    buf[(len >= buf_size)?(buf_size-1):len] = 0;
    result = (len >= buf_size)?-1:len;
    return result;
}
#endif
NK_LIB int
nk_strfmt(char *buf, int buf_size, const char *fmt, va_list args)
{
    int result = -1;
    NK_ASSERT(buf);
    NK_ASSERT(buf_size);
    if (!buf || !buf_size || !fmt) return 0;
#ifdef NK_INCLUDE_STANDARD_IO
    result = NK_VSNPRINTF(buf, (nk_size)buf_size, fmt, args);
    result = (result >= buf_size) ? -1: result;
    buf[buf_size-1] = 0;
#else
    result = nk_vsnprintf(buf, buf_size, fmt, args);
#endif
    return result;
}
#endif
NK_API nk_hash
nk_murmur_hash(const void * key, int len, nk_hash seed)
{
    /* 32-Bit MurmurHash3: https://code.google.com/p/smhasher/wiki/MurmurHash3*/
    #define NK_ROTL(x,r) ((x) << (r) | ((x) >> (32 - r)))

    nk_uint h1 = seed;
    nk_uint k1;
    const nk_byte *data = (const nk_byte*)key;
    const nk_byte *keyptr = data;
    nk_byte *k1ptr;
    const int bsize = sizeof(k1);
    const int nblocks = len/4;

    const nk_uint c1 = 0xcc9e2d51;
    const nk_uint c2 = 0x1b873593;
    const nk_byte *tail;
    int i;

    /* body */
    if (!key) return 0;
    for (i = 0; i < nblocks; ++i, keyptr += bsize) {
        k1ptr = (nk_byte*)&k1;
        k1ptr[0] = keyptr[0];
        k1ptr[1] = keyptr[1];
        k1ptr[2] = keyptr[2];
        k1ptr[3] = keyptr[3];

        k1 *= c1;
        k1 = NK_ROTL(k1,15);
        k1 *= c2;

        h1 ^= k1;
        h1 = NK_ROTL(h1,13);
        h1 = h1*5+0xe6546b64;
    }

    /* tail */
    tail = (const nk_byte*)(data + nblocks*4);
    k1 = 0;
    switch (len & 3) {
        case 3: k1 ^= (nk_uint)(tail[2] << 16); /* fallthrough */
        case 2: k1 ^= (nk_uint)(tail[1] << 8u); /* fallthrough */
        case 1: k1 ^= tail[0];
            k1 *= c1;
            k1 = NK_ROTL(k1,15);
            k1 *= c2;
            h1 ^= k1;
            break;
        default: break;
    }

    /* finalization */
    h1 ^= (nk_uint)len;
    /* fmix32 */
    h1 ^= h1 >> 16;
    h1 *= 0x85ebca6b;
    h1 ^= h1 >> 13;
    h1 *= 0xc2b2ae35;
    h1 ^= h1 >> 16;

    #undef NK_ROTL
    return h1;
}
#ifdef NK_INCLUDE_STANDARD_IO
NK_LIB char*
nk_file_load(const char* path, nk_size* siz, const struct nk_allocator *alloc)
{
    char *buf;
    FILE *fd;
    long ret;

    NK_ASSERT(path);
    NK_ASSERT(siz);
    NK_ASSERT(alloc);
    if (!path || !siz || !alloc)
        return 0;

    fd = fopen(path, "rb");
    if (!fd) return 0;
    fseek(fd, 0, SEEK_END);
    ret = ftell(fd);
    if (ret < 0) {
        fclose(fd);
        return 0;
    }
    *siz = (nk_size)ret;
    fseek(fd, 0, SEEK_SET);
    buf = (char*)alloc->alloc(alloc->userdata,0, *siz);
    NK_ASSERT(buf);
    if (!buf) {
        fclose(fd);
        return 0;
    }
    *siz = (nk_size)fread(buf, 1,*siz, fd);
    fclose(fd);
    return buf;
}
#endif
NK_LIB int
nk_text_clamp(const struct nk_user_font *font, const char *text,
    int text_len, float space, int *glyphs, float *text_width,
    nk_rune *sep_list, int sep_count)
{
    int i = 0;
    int glyph_len = 0;
    float last_width = 0;
    nk_rune unicode = 0;
    float width = 0;
    int len = 0;
    int g = 0;
    float s;

    int sep_len = 0;
    int sep_g = 0;
    float sep_width = 0;
    sep_count = NK_MAX(sep_count,0);

    glyph_len = nk_utf_decode(text, &unicode, text_len);
    while (glyph_len && (width < space) && (len < text_len)) {
        len += glyph_len;
        s = font->width(font->userdata, font->height, text, len);
        for (i = 0; i < sep_count; ++i) {
            if (unicode != sep_list[i]) continue;
            sep_width = last_width = width;
            sep_g = g+1;
            sep_len = len;
            break;
        }
        if (i == sep_count){
            last_width = sep_width = width;
            sep_g = g+1;
        }
        width = s;
        glyph_len = nk_utf_decode(&text[len], &unicode, text_len - len);
        g++;
    }
    if (len >= text_len) {
        *glyphs = g;
        *text_width = last_width;
        return len;
    } else {
        *glyphs = sep_g;
        *text_width = sep_width;
        return (!sep_len) ? len: sep_len;
    }
}
NK_LIB struct nk_vec2
nk_text_calculate_text_bounds(const struct nk_user_font *font,
    const char *begin, int byte_len, float row_height, const char **remaining,
    struct nk_vec2 *out_offset, int *glyphs, int op)
{
    float line_height = row_height;
    struct nk_vec2 text_size = nk_vec2(0,0);
    float line_width = 0.0f;

    float glyph_width;
    int glyph_len = 0;
    nk_rune unicode = 0;
    int text_len = 0;
    if (!begin || byte_len <= 0 || !font)
        return nk_vec2(0,row_height);

    glyph_len = nk_utf_decode(begin, &unicode, byte_len);
    if (!glyph_len) return text_size;
    glyph_width = font->width(font->userdata, font->height, begin, glyph_len);

    *glyphs = 0;
    while ((text_len < byte_len) && glyph_len) {
        if (unicode == '\n') {
            text_size.x = NK_MAX(text_size.x, line_width);
            text_size.y += line_height;
            line_width = 0;
            *glyphs+=1;
            if (op == NK_STOP_ON_NEW_LINE)
                break;

            text_len++;
            glyph_len = nk_utf_decode(begin + text_len, &unicode, byte_len-text_len);
            continue;
        }

        if (unicode == '\r') {
            text_len++;
            *glyphs+=1;
            glyph_len = nk_utf_decode(begin + text_len, &unicode, byte_len-text_len);
            continue;
        }

        *glyphs = *glyphs + 1;
        text_len += glyph_len;
        line_width += (float)glyph_width;
        glyph_len = nk_utf_decode(begin + text_len, &unicode, byte_len-text_len);
        glyph_width = font->width(font->userdata, font->height, begin+text_len, glyph_len);
        continue;
    }

    if (text_size.x < line_width)
        text_size.x = line_width;
    if (out_offset)
        *out_offset = nk_vec2(line_width, text_size.y + line_height);
    if (line_width > 0 || text_size.y == 0.0f)
        text_size.y += line_height;
    if (remaining)
        *remaining = begin+text_len;
    return text_size;
}

