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unicode.c
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unicode.c
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#include "chibicc.h"
#define UNICODE_C "unicode.c"
// Encode a given character in UTF-8.
int encode_utf8(char *buf, uint32_t c)
{
if (c <= 0x7F)
{
buf[0] = c;
return 1;
}
if (c <= 0x7FF)
{
buf[0] = 0b11000000 | (c >> 6);
buf[1] = 0b10000000 | (c & 0b00111111);
return 2;
}
if (c <= 0xFFFF)
{
buf[0] = 0b11100000 | (c >> 12);
buf[1] = 0b10000000 | ((c >> 6) & 0b00111111);
buf[2] = 0b10000000 | (c & 0b00111111);
return 3;
}
buf[0] = 0b11110000 | (c >> 18);
buf[1] = 0b10000000 | ((c >> 12) & 0b00111111);
buf[2] = 0b10000000 | ((c >> 6) & 0b00111111);
buf[3] = 0b10000000 | (c & 0b00111111);
return 4;
}
// Read a UTF-8-encoded Unicode code point from a source file.
// We assume that source files are always in UTF-8.
//
// UTF-8 is a variable-width encoding in which one code point is
// encoded in one to four bytes. One byte UTF-8 code points are
// identical to ASCII. Non-ASCII characters are encoded using more
// than one byte.
uint32_t decode_utf8(char **new_pos, char *p)
{
if ((unsigned char)*p < 128)
{
*new_pos = p + 1;
return *p;
}
char *start = p;
int len;
uint32_t c;
if ((unsigned char)*p >= 0b11110000)
{
len = 4;
c = *p & 0b111;
}
else if ((unsigned char)*p >= 0b11100000)
{
len = 3;
c = *p & 0b1111;
}
else if ((unsigned char)*p >= 0b11000000)
{
len = 2;
c = *p & 0b11111;
}
else
{
error_at(start, "%s invalid UTF-8 sequence", UNICODE_C);
}
for (int i = 1; i < len; i++)
{
if ((unsigned char)p[i] >> 6 != 0b10)
error_at(start, "%s invalid UTF-8 sequence", UNICODE_C);
c = (c << 6) | (p[i] & 0b111111);
}
*new_pos = p + len;
return c;
}
static bool in_range(uint32_t *range, uint32_t c)
{
for (int i = 0; range[i] != -1; i += 2)
if (range[i] <= c && c <= range[i + 1])
return true;
return false;
}
// [https://www.sigbus.info/n1570#D] C11 allows not only ASCII but
// some multibyte characters in certan Unicode ranges to be used in an
// identifier.
//
// This function returns true if a given character is acceptable as
// the first character of an identifier.
//
// For example, ¾ (U+00BE) is a valid identifier because characters in
// 0x00BE-0x00C0 are allowed, while neither ⟘ (U+27D8) nor ' '
// (U+3000, full-width space) are allowed because they are out of range.
// to solve issue #117 I had to add 0--9 range to be allowed because some generics parameters
// are defined after ## (double hashtag). Exemple in openssl ...(void))fromtype##2obj_decode},
// In this case chibicc manages 2 as a number because identifier should not start by a numeric value!
// creating is_ident3 to manage it
bool is_ident1(uint32_t c)
{
static uint32_t range[] = {
'_',
'_',
'a',
'z',
'A',
'Z',
'$',
'$',
0x00A8,
0x00A8,
0x00AA,
0x00AA,
0x00AD,
0x00AD,
0x00AF,
0x00AF,
0x00B2,
0x00B5,
0x00B7,
0x00BA,
0x00BC,
0x00BE,
0x00C0,
0x00D6,
0x00D8,
0x00F6,
0x00F8,
0x00FF,
0x0100,
0x02FF,
0x0370,
0x167F,
0x1681,
0x180D,
0x180F,
0x1DBF,
0x1E00,
0x1FFF,
0x200B,
0x200D,
0x202A,
0x202E,
0x203F,
0x2040,
0x2054,
0x2054,
0x2060,
0x206F,
0x2070,
0x20CF,
0x2100,
0x218F,
0x2460,
0x24FF,
0x2776,
0x2793,
0x2C00,
0x2DFF,
0x2E80,
0x2FFF,
0x3004,
0x3007,
0x3021,
0x302F,
0x3031,
0x303F,
0x3040,
0xD7FF,
0xF900,
0xFD3D,
0xFD40,
0xFDCF,
0xFDF0,
0xFE1F,
0xFE30,
0xFE44,
0xFE47,
0xFFFD,
0x10000,
0x1FFFD,
0x20000,
0x2FFFD,
0x30000,
0x3FFFD,
0x40000,
0x4FFFD,
0x50000,
0x5FFFD,
0x60000,
0x6FFFD,
0x70000,
0x7FFFD,
0x80000,
0x8FFFD,
0x90000,
0x9FFFD,
0xA0000,
0xAFFFD,
0xB0000,
0xBFFFD,
0xC0000,
0xCFFFD,
0xD0000,
0xDFFFD,
0xE0000,
0xEFFFD,
-1,
};
return in_range(range, c);
}
// Returns true if a given character is acceptable as a non-first
// character of an identifier.
bool is_ident2(uint32_t c)
{
static uint32_t range[] = {
'_',
'_',
'a',
'z',
'A',
'Z',
'0',
'9',
'$',
'$',
0x0300,
0x036F,
0x1DC0,
0x1DFF,
0x20D0,
0x20FF,
0xFE20,
0xFE2F,
-1,
};
return is_ident1(c) || in_range(range, c);
}
// For now the solution I found is to add here the range 0-9 has valid character for identifier.
// it means that some incorrect values would be allowed. To avoid it, I need to check if the previous character
// is hashtag to allow in this case an identifier starting with numeric character
bool is_ident3(uint32_t c)
{
static uint32_t range[] = {
'_',
'_',
'a',
'z',
'A',
'Z',
'0',
'9',
'$',
'$',
0x00A8,
0x00A8,
0x00AA,
0x00AA,
0x00AD,
0x00AD,
0x00AF,
0x00AF,
0x00B2,
0x00B5,
0x00B7,
0x00BA,
0x00BC,
0x00BE,
0x00C0,
0x00D6,
0x00D8,
0x00F6,
0x00F8,
0x00FF,
0x0100,
0x02FF,
0x0370,
0x167F,
0x1681,
0x180D,
0x180F,
0x1DBF,
0x1E00,
0x1FFF,
0x200B,
0x200D,
0x202A,
0x202E,
0x203F,
0x2040,
0x2054,
0x2054,
0x2060,
0x206F,
0x2070,
0x20CF,
0x2100,
0x218F,
0x2460,
0x24FF,
0x2776,
0x2793,
0x2C00,
0x2DFF,
0x2E80,
0x2FFF,
0x3004,
0x3007,
0x3021,
0x302F,
0x3031,
0x303F,
0x3040,
0xD7FF,
0xF900,
0xFD3D,
0xFD40,
0xFDCF,
0xFDF0,
0xFE1F,
0xFE30,
0xFE44,
0xFE47,
0xFFFD,
0x10000,
0x1FFFD,
0x20000,
0x2FFFD,
0x30000,
0x3FFFD,
0x40000,
0x4FFFD,
0x50000,
0x5FFFD,
0x60000,
0x6FFFD,
0x70000,
0x7FFFD,
0x80000,
0x8FFFD,
0x90000,
0x9FFFD,
0xA0000,
0xAFFFD,
0xB0000,
0xBFFFD,
0xC0000,
0xCFFFD,
0xD0000,
0xDFFFD,
0xE0000,
0xEFFFD,
-1,
};
return in_range(range, c);
}
// Returns the number of columns needed to display a given
// character in a fixed-width font.
//
// Based on https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
static int char_width(uint32_t c)
{
static uint32_t range1[] = {
0x0000,
0x001F,
0x007f,
0x00a0,
0x0300,
0x036F,
0x0483,
0x0486,
0x0488,
0x0489,
0x0591,
0x05BD,
0x05BF,
0x05BF,
0x05C1,
0x05C2,
0x05C4,
0x05C5,
0x05C7,
0x05C7,
0x0600,
0x0603,
0x0610,
0x0615,
0x064B,
0x065E,
0x0670,
0x0670,
0x06D6,
0x06E4,
0x06E7,
0x06E8,
0x06EA,
0x06ED,
0x070F,
0x070F,
0x0711,
0x0711,
0x0730,
0x074A,
0x07A6,
0x07B0,
0x07EB,
0x07F3,
0x0901,
0x0902,
0x093C,
0x093C,
0x0941,
0x0948,
0x094D,
0x094D,
0x0951,
0x0954,
0x0962,
0x0963,
0x0981,
0x0981,
0x09BC,
0x09BC,
0x09C1,
0x09C4,
0x09CD,
0x09CD,
0x09E2,
0x09E3,
0x0A01,
0x0A02,
0x0A3C,
0x0A3C,
0x0A41,
0x0A42,
0x0A47,
0x0A48,
0x0A4B,
0x0A4D,
0x0A70,
0x0A71,
0x0A81,
0x0A82,
0x0ABC,
0x0ABC,
0x0AC1,
0x0AC5,
0x0AC7,
0x0AC8,
0x0ACD,
0x0ACD,
0x0AE2,
0x0AE3,
0x0B01,
0x0B01,
0x0B3C,
0x0B3C,
0x0B3F,
0x0B3F,
0x0B41,
0x0B43,
0x0B4D,
0x0B4D,
0x0B56,
0x0B56,
0x0B82,
0x0B82,
0x0BC0,
0x0BC0,
0x0BCD,
0x0BCD,
0x0C3E,
0x0C40,
0x0C46,
0x0C48,
0x0C4A,
0x0C4D,
0x0C55,
0x0C56,
0x0CBC,
0x0CBC,
0x0CBF,
0x0CBF,
0x0CC6,
0x0CC6,
0x0CCC,
0x0CCD,
0x0CE2,
0x0CE3,
0x0D41,
0x0D43,
0x0D4D,
0x0D4D,
0x0DCA,
0x0DCA,
0x0DD2,
0x0DD4,
0x0DD6,
0x0DD6,
0x0E31,
0x0E31,
0x0E34,
0x0E3A,
0x0E47,
0x0E4E,
0x0EB1,
0x0EB1,
0x0EB4,
0x0EB9,
0x0EBB,
0x0EBC,
0x0EC8,
0x0ECD,
0x0F18,
0x0F19,
0x0F35,
0x0F35,
0x0F37,
0x0F37,
0x0F39,
0x0F39,
0x0F71,
0x0F7E,
0x0F80,
0x0F84,
0x0F86,
0x0F87,
0x0F90,
0x0F97,
0x0F99,
0x0FBC,
0x0FC6,
0x0FC6,
0x102D,
0x1030,
0x1032,
0x1032,
0x1036,
0x1037,
0x1039,
0x1039,
0x1058,
0x1059,
0x1160,
0x11FF,
0x135F,
0x135F,
0x1712,
0x1714,
0x1732,
0x1734,
0x1752,
0x1753,
0x1772,
0x1773,
0x17B4,
0x17B5,
0x17B7,
0x17BD,
0x17C6,
0x17C6,
0x17C9,
0x17D3,
0x17DD,
0x17DD,
0x180B,
0x180D,
0x18A9,
0x18A9,
0x1920,
0x1922,
0x1927,
0x1928,
0x1932,
0x1932,
0x1939,
0x193B,
0x1A17,
0x1A18,
0x1B00,
0x1B03,
0x1B34,
0x1B34,
0x1B36,
0x1B3A,
0x1B3C,
0x1B3C,
0x1B42,
0x1B42,
0x1B6B,
0x1B73,
0x1DC0,
0x1DCA,
0x1DFE,
0x1DFF,
0x200B,
0x200F,
0x202A,
0x202E,
0x2060,
0x2063,
0x206A,
0x206F,
0x20D0,
0x20EF,
0x302A,
0x302F,
0x3099,
0x309A,
0xA806,
0xA806,
0xA80B,
0xA80B,
0xA825,
0xA826,
0xFB1E,
0xFB1E,
0xFE00,
0xFE0F,
0xFE20,
0xFE23,
0xFEFF,
0xFEFF,
0xFFF9,
0xFFFB,
0x10A01,
0x10A03,
0x10A05,
0x10A06,
0x10A0C,
0x10A0F,
0x10A38,
0x10A3A,
0x10A3F,
0x10A3F,
0x1D167,
0x1D169,
0x1D173,
0x1D182,
0x1D185,
0x1D18B,
0x1D1AA,
0x1D1AD,
0x1D242,
0x1D244,
0xE0001,
0xE0001,
0xE0020,
0xE007F,
0xE0100,
0xE01EF,
-1,
};
if (in_range(range1, c))
return 0;
static uint32_t range2[] = {
0x1100,
0x115F,
0x2329,
0x2329,
0x232A,
0x232A,
0x2E80,
0x303E,
0x3040,
0xA4CF,
0xAC00,
0xD7A3,
0xF900,
0xFAFF,
0xFE10,
0xFE19,
0xFE30,
0xFE6F,
0xFF00,
0xFF60,
0xFFE0,
0xFFE6,
0x1F000,
0x1F644,
0x20000,
0x2FFFD,
0x30000,
0x3FFFD,
-1,
};
if (in_range(range2, c))
return 2;
return 1;
}
// Returns the number of columns needed to display a given
// string in a fixed-width font.
int display_width(char *p, int len)
{
char *start = p;
int w = 0;
while (p - start < len)
{
uint32_t c = decode_utf8(&p, p);
w += char_width(c);
}
return w;
}