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📄 Makefile(7.34 KB)
📄 lapi.c(34.08 KB)
📄 lapi.h(1.27 KB)
📄 lauxlib.c(30.94 KB)
📄 lauxlib.h(8.64 KB)
📄 lbaselib.c(14.44 KB)
📄 lcode.c(49.85 KB)
📄 lcode.h(3.71 KB)
📄 lcorolib.c(4.57 KB)
📄 lctype.c(2.4 KB)
📄 lctype.h(2.07 KB)
📄 ldblib.c(12.94 KB)
📄 ldebug.c(24.61 KB)
📄 ldebug.h(1.87 KB)
📄 ldo.c(27.19 KB)
📄 ldo.h(2.77 KB)
📄 ldump.c(4.66 KB)
📄 lfunc.c(8.95 KB)
📄 lfunc.h(1.72 KB)
📄 lgc.c(54.47 KB)
📄 lgc.h(5.87 KB)
📄 linit.c(1.58 KB)
📄 liolib.c(21.25 KB)
📄 ljumptab.h(1.62 KB)
📄 llex.c(16.38 KB)
📄 llex.h(2.35 KB)
📄 llimits.h(8.72 KB)
📄 lmathlib.c(18.43 KB)
📄 lmem.c(5.83 KB)
📄 lmem.h(3.29 KB)
📄 loadlib.c(22.39 KB)
📄 lobject.c(18.45 KB)
📄 lobject.h(21.49 KB)
📄 lopcodes.c(4.03 KB)
📄 lopcodes.h(12.38 KB)
📄 lopnames.h(1.12 KB)
📄 loslib.c(11.53 KB)
📄 lparser.c(54.72 KB)
📄 lparser.h(5.8 KB)
📄 lprefix.h(828 B)
📄 lstate.c(10.73 KB)
📄 lstate.h(13.24 KB)
📄 lstring.c(7.32 KB)
📄 lstring.h(1.57 KB)
📄 lstrlib.c(52.83 KB)
📄 ltable.c(29.89 KB)
📄 ltable.h(1.92 KB)
📄 ltablib.c(12.82 KB)
📄 ltm.c(7.97 KB)
📄 ltm.h(2.84 KB)
📄 lua.c(18.46 KB)
📄 lua.h(15.4 KB)
📄 lua.hpp(191 B)
📄 luac.c(14.79 KB)
📄 luaconf.h.dist(20.27 KB)
📄 lualib.h(1.16 KB)
📄 lundump.c(7.68 KB)
📄 lundump.h(863 B)
📄 lutf8lib.c(7.9 KB)
📄 lvm.c(55.76 KB)
📄 lvm.h(4.25 KB)
📄 lzio.c(1.29 KB)
📄 lzio.h(1.4 KB)

Editing: lutf8lib.c

/*
** $Id: lutf8lib.c $
** Standard library for UTF-8 manipulation
** See Copyright Notice in lua.h
*/

#define lutf8lib_c
#define LUA_LIB

#include "lprefix.h"

#include <assert.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>

#include "lua.h"

#include "lauxlib.h"
#include "lualib.h"

#define MAXUNICODE	0x10FFFFu

#define MAXUTF		0x7FFFFFFFu

/*
** Integer type for decoded UTF-8 values; MAXUTF needs 31 bits.
*/
#if (UINT_MAX >> 30) >= 1
typedef unsigned int utfint;
#else
typedef unsigned long utfint;
#endif

#define iscont(p)	((*(p) & 0xC0) == 0x80)

/* from strlib */
/* translate a relative string position: negative means back from end */
static lua_Integer u_posrelat (lua_Integer pos, size_t len) {
  if (pos >= 0) return pos;
  else if (0u - (size_t)pos > len) return 0;
  else return (lua_Integer)len + pos + 1;
}

/*
** Decode one UTF-8 sequence, returning NULL if byte sequence is
** invalid.  The array 'limits' stores the minimum value for each
** sequence length, to check for overlong representations. Its first
** entry forces an error for non-ascii bytes with no continuation
** bytes (count == 0).
*/
static const char *utf8_decode (const char *s, utfint *val, int strict) {
  static const utfint limits[] =
        {~(utfint)0, 0x80, 0x800, 0x10000u, 0x200000u, 0x4000000u};
  unsigned int c = (unsigned char)s[0];
  utfint res = 0;  /* final result */
  if (c < 0x80)  /* ascii? */
    res = c;
  else {
    int count = 0;  /* to count number of continuation bytes */
    for (; c & 0x40; c <<= 1) {  /* while it needs continuation bytes... */
      unsigned int cc = (unsigned char)s[++count];  /* read next byte */
      if ((cc & 0xC0) != 0x80)  /* not a continuation byte? */
        return NULL;  /* invalid byte sequence */
      res = (res << 6) | (cc & 0x3F);  /* add lower 6 bits from cont. byte */
    }
    res |= ((utfint)(c & 0x7F) << (count * 5));  /* add first byte */
    if (count > 5 || res > MAXUTF || res < limits[count])
      return NULL;  /* invalid byte sequence */
    s += count;  /* skip continuation bytes read */
  }
  if (strict) {
    /* check for invalid code points; too large or surrogates */
    if (res > MAXUNICODE || (0xD800u <= res && res <= 0xDFFFu))
      return NULL;
  }
  if (val) *val = res;
  return s + 1;  /* +1 to include first byte */
}

/*
** utf8len(s [, i [, j [, lax]]]) --> number of characters that
** start in the range [i,j], or nil + current position if 's' is not
** well formed in that interval
*/
static int utflen (lua_State *L) {
  lua_Integer n = 0;  /* counter for the number of characters */
  size_t len;  /* string length in bytes */
  const char *s = luaL_checklstring(L, 1, &len);
  lua_Integer posi = u_posrelat(luaL_optinteger(L, 2, 1), len);
  lua_Integer posj = u_posrelat(luaL_optinteger(L, 3, -1), len);
  int lax = lua_toboolean(L, 4);
  luaL_argcheck(L, 1 <= posi && --posi <= (lua_Integer)len, 2,
                   "initial position out of bounds");
  luaL_argcheck(L, --posj < (lua_Integer)len, 3,
                   "final position out of bounds");
  while (posi <= posj) {
    const char *s1 = utf8_decode(s + posi, NULL, !lax);
    if (s1 == NULL) {  /* conversion error? */
      luaL_pushfail(L);  /* return fail ... */
      lua_pushinteger(L, posi + 1);  /* ... and current position */
      return 2;
    }
    posi = s1 - s;
    n++;
  }
  lua_pushinteger(L, n);
  return 1;
}

/*
** codepoint(s, [i, [j [, lax]]]) -> returns codepoints for all
** characters that start in the range [i,j]
*/
static int codepoint (lua_State *L) {
  size_t len;
  const char *s = luaL_checklstring(L, 1, &len);
  lua_Integer posi = u_posrelat(luaL_optinteger(L, 2, 1), len);
  lua_Integer pose = u_posrelat(luaL_optinteger(L, 3, posi), len);
  int lax = lua_toboolean(L, 4);
  int n;
  const char *se;
  luaL_argcheck(L, posi >= 1, 2, "out of bounds");
  luaL_argcheck(L, pose <= (lua_Integer)len, 3, "out of bounds");
  if (posi > pose) return 0;  /* empty interval; return no values */
  if (pose - posi >= INT_MAX)  /* (lua_Integer -> int) overflow? */
    return luaL_error(L, "string slice too long");
  n = (int)(pose -  posi) + 1;  /* upper bound for number of returns */
  luaL_checkstack(L, n, "string slice too long");
  n = 0;  /* count the number of returns */
  se = s + pose;  /* string end */
  for (s += posi - 1; s < se;) {
    utfint code;
    s = utf8_decode(s, &code, !lax);
    if (s == NULL)
      return luaL_error(L, "invalid UTF-8 code");
    lua_pushinteger(L, code);
    n++;
  }
  return n;
}

static void pushutfchar (lua_State *L, int arg) {
  lua_Unsigned code = (lua_Unsigned)luaL_checkinteger(L, arg);
  luaL_argcheck(L, code <= MAXUTF, arg, "value out of range");
  lua_pushfstring(L, "%U", (long)code);
}

/*
** utfchar(n1, n2, ...)  -> char(n1)..char(n2)...
*/
static int utfchar (lua_State *L) {
  int n = lua_gettop(L);  /* number of arguments */
  if (n == 1)  /* optimize common case of single char */
    pushutfchar(L, 1);
  else {
    int i;
    luaL_Buffer b;
    luaL_buffinit(L, &b);
    for (i = 1; i <= n; i++) {
      pushutfchar(L, i);
      luaL_addvalue(&b);
    }
    luaL_pushresult(&b);
  }
  return 1;
}

/*
** offset(s, n, [i])  -> index where n-th character counting from
**   position 'i' starts; 0 means character at 'i'.
*/
static int byteoffset (lua_State *L) {
  size_t len;
  const char *s = luaL_checklstring(L, 1, &len);
  lua_Integer n  = luaL_checkinteger(L, 2);
  lua_Integer posi = (n >= 0) ? 1 : len + 1;
  posi = u_posrelat(luaL_optinteger(L, 3, posi), len);
  luaL_argcheck(L, 1 <= posi && --posi <= (lua_Integer)len, 3,
                   "position out of bounds");
  if (n == 0) {
    /* find beginning of current byte sequence */
    while (posi > 0 && iscont(s + posi)) posi--;
  }
  else {
    if (iscont(s + posi))
      return luaL_error(L, "initial position is a continuation byte");
    if (n < 0) {
       while (n < 0 && posi > 0) {  /* move back */
         do {  /* find beginning of previous character */
           posi--;
         } while (posi > 0 && iscont(s + posi));
         n++;
       }
     }
     else {
       n--;  /* do not move for 1st character */
       while (n > 0 && posi < (lua_Integer)len) {
         do {  /* find beginning of next character */
           posi++;
         } while (iscont(s + posi));  /* (cannot pass final '\0') */
         n--;
       }
     }
  }
  if (n == 0)  /* did it find given character? */
    lua_pushinteger(L, posi + 1);
  else  /* no such character */
    luaL_pushfail(L);
  return 1;
}

static int iter_aux (lua_State *L, int strict) {
  size_t len;
  const char *s = luaL_checklstring(L, 1, &len);
  lua_Integer n = lua_tointeger(L, 2) - 1;
  if (n < 0)  /* first iteration? */
    n = 0;  /* start from here */
  else if (n < (lua_Integer)len) {
    n++;  /* skip current byte */
    while (iscont(s + n)) n++;  /* and its continuations */
  }
  if (n >= (lua_Integer)len)
    return 0;  /* no more codepoints */
  else {
    utfint code;
    const char *next = utf8_decode(s + n, &code, strict);
    if (next == NULL)
      return luaL_error(L, "invalid UTF-8 code");
    lua_pushinteger(L, n + 1);
    lua_pushinteger(L, code);
    return 2;
  }
}

static int iter_auxstrict (lua_State *L) {
  return iter_aux(L, 1);
}

static int iter_auxlax (lua_State *L) {
  return iter_aux(L, 0);
}

static int iter_codes (lua_State *L) {
  int lax = lua_toboolean(L, 2);
  luaL_checkstring(L, 1);
  lua_pushcfunction(L, lax ? iter_auxlax : iter_auxstrict);
  lua_pushvalue(L, 1);
  lua_pushinteger(L, 0);
  return 3;
}

/* pattern to match a single UTF-8 character */
#define UTF8PATT	"[\0-\x7F\xC2-\xFD][\x80-\xBF]*"

static const luaL_Reg funcs[] = {
  {"offset", byteoffset},
  {"codepoint", codepoint},
  {"char", utfchar},
  {"len", utflen},
  {"codes", iter_codes},
  /* placeholders */
  {"charpattern", NULL},
  {NULL, NULL}
};

LUAMOD_API int luaopen_utf8 (lua_State *L) {
  luaL_newlib(L, funcs);
  lua_pushlstring(L, UTF8PATT, sizeof(UTF8PATT)/sizeof(char) - 1);
  lua_setfield(L, -2, "charpattern");
  return 1;
}

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Editing: lutf8lib.c

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