#include "yarp/enc/yp_encoding.h"

// Each element of the following table contains a bitfield that indicates a
// piece of information about the corresponding ASCII character.
static unsigned char yp_encoding_ascii_table[256] = {
//  0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0x
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 1x
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 2x
    2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, // 3x
    0, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, // 4x
    7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 0, 0, 0, 0, 0, // 5x
    0, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, // 6x
    3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 0, 0, 0, 0, 0, // 7x
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 8x
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 9x
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Ax
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Bx
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Cx
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Dx
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Ex
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // Fx
};

static size_t
yp_encoding_ascii_char_width(const char *c) {
    const unsigned char v = (const unsigned char) *c;
    return v < 0x80 ? 1 : 0;
}

size_t
yp_encoding_ascii_alpha_char(const char *c) {
    const unsigned char v = (const unsigned char) *c;
    return (yp_encoding_ascii_table[v] & YP_ENCODING_ALPHABETIC_BIT) ? 1 : 0;
}

size_t
yp_encoding_ascii_alnum_char(const char *c) {
    const unsigned char v = (const unsigned char) *c;
    return (yp_encoding_ascii_table[v] & YP_ENCODING_ALPHANUMERIC_BIT) ? 1 : 0;
}

bool
yp_encoding_ascii_isupper_char(const char *c) {
    const unsigned char v = (const unsigned char) *c;
    return (yp_encoding_ascii_table[v] & YP_ENCODING_UPPERCASE_BIT) ? true : false;
}

yp_encoding_t yp_encoding_ascii = {
    .name = "ascii",
    .char_width = yp_encoding_ascii_char_width,
    .alnum_char = yp_encoding_ascii_alnum_char,
    .alpha_char = yp_encoding_ascii_alpha_char,
    .isupper_char = yp_encoding_ascii_isupper_char,
    .multibyte = false
};

yp_encoding_t yp_encoding_ascii_8bit = {
    .name = "ascii-8bit",
    .char_width = yp_encoding_single_char_width,
    .alnum_char = yp_encoding_ascii_alnum_char,
    .alpha_char = yp_encoding_ascii_alpha_char,
    .isupper_char = yp_encoding_ascii_isupper_char,
    .multibyte = false
};