diff options
Diffstat (limited to 'src/lua/lstrlib.c')
-rw-r--r-- | src/lua/lstrlib.c | 621 |
1 files changed, 0 insertions, 621 deletions
diff --git a/src/lua/lstrlib.c b/src/lua/lstrlib.c deleted file mode 100644 index 051eccf7..00000000 --- a/src/lua/lstrlib.c +++ /dev/null @@ -1,621 +0,0 @@ -/* -** $Id: lstrlib.c,v 1.3 2001/11/26 23:00:26 darkgod Exp $ -** Standard library for string operations and pattern-matching -** See Copyright Notice in lua.h -*/ - - -#include <ctype.h> -#include <stddef.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> - -#include "lua.h" - -#include "lauxlib.h" -#include "lualib.h" - - - -static int str_len (lua_State *L) { - size_t l; - luaL_check_lstr(L, 1, &l); - lua_pushnumber(L, l); - return 1; -} - - -static long posrelat (long pos, size_t len) { - /* relative string position: negative means back from end */ - return (pos>=0) ? pos : (long)len+pos+1; -} - - -static int str_sub (lua_State *L) { - size_t l; - const char *s = luaL_check_lstr(L, 1, &l); - long start = posrelat(luaL_check_long(L, 2), l); - long end = posrelat(luaL_opt_long(L, 3, -1), l); - if (start < 1) start = 1; - if (end > (long)l) end = l; - if (start <= end) - lua_pushlstring(L, s+start-1, end-start+1); - else lua_pushstring(L, ""); - return 1; -} - - -static int str_lower (lua_State *L) { - size_t l; - size_t i; - luaL_Buffer b; - const char *s = luaL_check_lstr(L, 1, &l); - luaL_buffinit(L, &b); - for (i=0; i<l; i++) - luaL_putchar(&b, tolower((unsigned char)(s[i]))); - luaL_pushresult(&b); - return 1; -} - - -static int str_upper (lua_State *L) { - size_t l; - size_t i; - luaL_Buffer b; - const char *s = luaL_check_lstr(L, 1, &l); - luaL_buffinit(L, &b); - for (i=0; i<l; i++) - luaL_putchar(&b, toupper((unsigned char)(s[i]))); - luaL_pushresult(&b); - return 1; -} - -static int str_rep (lua_State *L) { - size_t l; - luaL_Buffer b; - const char *s = luaL_check_lstr(L, 1, &l); - int n = luaL_check_int(L, 2); - luaL_buffinit(L, &b); - while (n-- > 0) - luaL_addlstring(&b, s, l); - luaL_pushresult(&b); - return 1; -} - - -static int str_byte (lua_State *L) { - size_t l; - const char *s = luaL_check_lstr(L, 1, &l); - long pos = posrelat(luaL_opt_long(L, 2, 1), l); - luaL_arg_check(L, 0<pos && (size_t)pos<=l, 2, "out of range"); - lua_pushnumber(L, (unsigned char)s[pos-1]); - return 1; -} - - -static int str_char (lua_State *L) { - int n = lua_gettop(L); /* number of arguments */ - int i; - luaL_Buffer b; - luaL_buffinit(L, &b); - for (i=1; i<=n; i++) { - int c = luaL_check_int(L, i); - luaL_arg_check(L, (unsigned char)c == c, i, "invalid value"); - luaL_putchar(&b, (unsigned char)c); - } - luaL_pushresult(&b); - return 1; -} - - - -/* -** {====================================================== -** PATTERN MATCHING -** ======================================================= -*/ - -#ifndef MAX_CAPTURES -#define MAX_CAPTURES 32 /* arbitrary limit */ -#endif - - -struct Capture { - const char *src_end; /* end ('\0') of source string */ - int level; /* total number of captures (finished or unfinished) */ - struct { - const char *init; - long len; /* -1 signals unfinished capture */ - } capture[MAX_CAPTURES]; -}; - - -#define ESC '%' -#define SPECIALS "^$*+?.([%-" - - -static int check_capture (lua_State *L, int l, struct Capture *cap) { - l -= '1'; - if (!(0 <= l && l < cap->level && cap->capture[l].len != -1)) - lua_error(L, "invalid capture index"); - return l; -} - - -static int capture_to_close (lua_State *L, struct Capture *cap) { - int level = cap->level; - for (level--; level>=0; level--) - if (cap->capture[level].len == -1) return level; - lua_error(L, "invalid pattern capture"); - return 0; /* to avoid warnings */ -} - - -const char *luaI_classend (lua_State *L, const char *p) { - switch (*p++) { - case ESC: - if (*p == '\0') lua_error(L, "malformed pattern (ends with `%')"); - return p+1; - case '[': - if (*p == '^') p++; - do { /* look for a ']' */ - if (*p == '\0') lua_error(L, "malformed pattern (missing `]')"); - if (*(p++) == ESC && *p != '\0') p++; /* skip escapes (e.g. '%]') */ - } while (*p != ']'); - return p+1; - default: - return p; - } -} - - -static int match_class (int c, int cl) { - int res; - switch (tolower(cl)) { - case 'a' : res = isalpha(c); break; - case 'c' : res = iscntrl(c); break; - case 'd' : res = isdigit(c); break; - case 'l' : res = islower(c); break; - case 'p' : res = ispunct(c); break; - case 's' : res = isspace(c); break; - case 'u' : res = isupper(c); break; - case 'w' : res = isalnum(c); break; - case 'x' : res = isxdigit(c); break; - case 'z' : res = (c == '\0'); break; - default: return (cl == c); - } - return (islower(cl) ? res : !res); -} - - - -static int matchbracketclass (int c, const char *p, const char *endclass) { - int sig = 1; - if (*(p+1) == '^') { - sig = 0; - p++; /* skip the '^' */ - } - while (++p < endclass) { - if (*p == ESC) { - p++; - if (match_class(c, (unsigned char)*p)) - return sig; - } - else if ((*(p+1) == '-') && (p+2 < endclass)) { - p+=2; - if ((int)(unsigned char)*(p-2) <= c && c <= (int)(unsigned char)*p) - return sig; - } - else if ((int)(unsigned char)*p == c) return sig; - } - return !sig; -} - - - -int luaI_singlematch (int c, const char *p, const char *ep) { - switch (*p) { - case '.': /* matches any char */ - return 1; - case ESC: - return match_class(c, (unsigned char)*(p+1)); - case '[': - return matchbracketclass(c, p, ep-1); - default: - return ((unsigned char)*p == c); - } -} - - -static const char *match (lua_State *L, const char *s, const char *p, - struct Capture *cap); - - -static const char *matchbalance (lua_State *L, const char *s, const char *p, - struct Capture *cap) { - if (*p == 0 || *(p+1) == 0) - lua_error(L, "unbalanced pattern"); - if (*s != *p) return NULL; - else { - int b = *p; - int e = *(p+1); - int cont = 1; - while (++s < cap->src_end) { - if (*s == e) { - if (--cont == 0) return s+1; - } - else if (*s == b) cont++; - } - } - return NULL; /* string ends out of balance */ -} - - -static const char *max_expand (lua_State *L, const char *s, const char *p, - const char *ep, struct Capture *cap) { - long i = 0; /* counts maximum expand for item */ - while ((s+i)<cap->src_end && luaI_singlematch((unsigned char)*(s+i), p, ep)) - i++; - /* keeps trying to match with the maximum repetitions */ - while (i>=0) { - const char *res = match(L, (s+i), ep+1, cap); - if (res) return res; - i--; /* else didn't match; reduce 1 repetition to try again */ - } - return NULL; -} - - -static const char *min_expand (lua_State *L, const char *s, const char *p, - const char *ep, struct Capture *cap) { - for (;;) { - const char *res = match(L, s, ep+1, cap); - if (res != NULL) - return res; - else if (s<cap->src_end && luaI_singlematch((unsigned char)*s, p, ep)) - s++; /* try with one more repetition */ - else return NULL; - } -} - - -static const char *start_capture (lua_State *L, const char *s, const char *p, - struct Capture *cap) { - const char *res; - int level = cap->level; - if (level >= MAX_CAPTURES) lua_error(L, "too many captures"); - cap->capture[level].init = s; - cap->capture[level].len = -1; - cap->level = level+1; - if ((res=match(L, s, p+1, cap)) == NULL) /* match failed? */ - cap->level--; /* undo capture */ - return res; -} - - -static const char *end_capture (lua_State *L, const char *s, const char *p, - struct Capture *cap) { - int l = capture_to_close(L, cap); - const char *res; - cap->capture[l].len = s - cap->capture[l].init; /* close capture */ - if ((res = match(L, s, p+1, cap)) == NULL) /* match failed? */ - cap->capture[l].len = -1; /* undo capture */ - return res; -} - - -static const char *match_capture (lua_State *L, const char *s, int level, - struct Capture *cap) { - int l = check_capture(L, level, cap); - size_t len = cap->capture[l].len; - if ((size_t)(cap->src_end-s) >= len && - memcmp(cap->capture[l].init, s, len) == 0) - return s+len; - else return NULL; -} - - -static const char *match (lua_State *L, const char *s, const char *p, - struct Capture *cap) { - init: /* using goto's to optimize tail recursion */ - switch (*p) { - case '(': /* start capture */ - return start_capture(L, s, p, cap); - case ')': /* end capture */ - return end_capture(L, s, p, cap); - case ESC: /* may be %[0-9] or %b */ - if (isdigit((unsigned char)(*(p+1)))) { /* capture? */ - s = match_capture(L, s, *(p+1), cap); - if (s == NULL) return NULL; - p+=2; goto init; /* else return match(L, s, p+2, cap) */ - } - else if (*(p+1) == 'b') { /* balanced string? */ - s = matchbalance(L, s, p+2, cap); - if (s == NULL) return NULL; - p+=4; goto init; /* else return match(L, s, p+4, cap); */ - } - else goto dflt; /* case default */ - case '\0': /* end of pattern */ - return s; /* match succeeded */ - case '$': - if (*(p+1) == '\0') /* is the '$' the last char in pattern? */ - return (s == cap->src_end) ? s : NULL; /* check end of string */ - else goto dflt; - default: dflt: { /* it is a pattern item */ - const char *ep = luaI_classend(L, p); /* points to what is next */ - int m = s<cap->src_end && luaI_singlematch((unsigned char)*s, p, ep); - switch (*ep) { - case '?': { /* optional */ - const char *res; - if (m && ((res=match(L, s+1, ep+1, cap)) != NULL)) - return res; - p=ep+1; goto init; /* else return match(L, s, ep+1, cap); */ - } - case '*': /* 0 or more repetitions */ - return max_expand(L, s, p, ep, cap); - case '+': /* 1 or more repetitions */ - return (m ? max_expand(L, s+1, p, ep, cap) : NULL); - case '-': /* 0 or more repetitions (minimum) */ - return min_expand(L, s, p, ep, cap); - default: - if (!m) return NULL; - s++; p=ep; goto init; /* else return match(L, s+1, ep, cap); */ - } - } - } -} - - - -static const char *lmemfind (const char *s1, size_t l1, - const char *s2, size_t l2) { - if (l2 == 0) return s1; /* empty strings are everywhere */ - else if (l2 > l1) return NULL; /* avoids a negative `l1' */ - else { - const char *init; /* to search for a `*s2' inside `s1' */ - l2--; /* 1st char will be checked by `memchr' */ - l1 = l1-l2; /* `s2' cannot be found after that */ - while (l1 > 0 && (init = (const char *)memchr(s1, *s2, l1)) != NULL) { - init++; /* 1st char is already checked */ - if (memcmp(init, s2+1, l2) == 0) - return init-1; - else { /* correct `l1' and `s1' to try again */ - l1 -= init-s1; - s1 = init; - } - } - return NULL; /* not found */ - } -} - - -static int push_captures (lua_State *L, struct Capture *cap) { - int i; - luaL_checkstack(L, cap->level, "too many captures"); - for (i=0; i<cap->level; i++) { - int l = cap->capture[i].len; - if (l == -1) lua_error(L, "unfinished capture"); - lua_pushlstring(L, cap->capture[i].init, l); - } - return cap->level; /* number of strings pushed */ -} - - -static int str_find (lua_State *L) { - size_t l1, l2; - const char *s = luaL_check_lstr(L, 1, &l1); - const char *p = luaL_check_lstr(L, 2, &l2); - long init = posrelat(luaL_opt_long(L, 3, 1), l1) - 1; - struct Capture cap; - luaL_arg_check(L, 0 <= init && (size_t)init <= l1, 3, "out of range"); - if (lua_gettop(L) > 3 || /* extra argument? */ - strpbrk(p, SPECIALS) == NULL) { /* or no special characters? */ - const char *s2 = lmemfind(s+init, l1-init, p, l2); - if (s2) { - lua_pushnumber(L, s2-s+1); - lua_pushnumber(L, s2-s+l2); - return 2; - } - } - else { - int anchor = (*p == '^') ? (p++, 1) : 0; - const char *s1=s+init; - cap.src_end = s+l1; - do { - const char *res; - cap.level = 0; - if ((res=match(L, s1, p, &cap)) != NULL) { - lua_pushnumber(L, s1-s+1); /* start */ - lua_pushnumber(L, res-s); /* end */ - return push_captures(L, &cap) + 2; - } - } while (s1++<cap.src_end && !anchor); - } - lua_pushnil(L); /* not found */ - return 1; -} - - -static void add_s (lua_State *L, luaL_Buffer *b, struct Capture *cap) { - if (lua_isstring(L, 3)) { - const char *news = lua_tostring(L, 3); - size_t l = lua_strlen(L, 3); - size_t i; - for (i=0; i<l; i++) { - if (news[i] != ESC) - luaL_putchar(b, news[i]); - else { - i++; /* skip ESC */ - if (!isdigit((unsigned char)news[i])) - luaL_putchar(b, news[i]); - else { - int level = check_capture(L, news[i], cap); - luaL_addlstring(b, cap->capture[level].init, cap->capture[level].len); - } - } - } - } - else { /* is a function */ - int n; - lua_pushvalue(L, 3); - n = push_captures(L, cap); - lua_rawcall(L, n, 1); - if (lua_isstring(L, -1)) - luaL_addvalue(b); /* add return to accumulated result */ - else - lua_pop(L, 1); /* function result is not a string: pop it */ - } -} - - -static int str_gsub (lua_State *L) { - size_t srcl; - const char *src = luaL_check_lstr(L, 1, &srcl); - const char *p = luaL_check_string(L, 2); - int max_s = luaL_opt_int(L, 4, srcl+1); - int anchor = (*p == '^') ? (p++, 1) : 0; - int n = 0; - struct Capture cap; - luaL_Buffer b; - luaL_arg_check(L, - lua_gettop(L) >= 3 && (lua_isstring(L, 3) || lua_isfunction(L, 3)), - 3, "string or function expected"); - luaL_buffinit(L, &b); - cap.src_end = src+srcl; - while (n < max_s) { - const char *e; - cap.level = 0; - e = match(L, src, p, &cap); - if (e) { - n++; - add_s(L, &b, &cap); - } - if (e && e>src) /* non empty match? */ - src = e; /* skip it */ - else if (src < cap.src_end) - luaL_putchar(&b, *src++); - else break; - if (anchor) break; - } - luaL_addlstring(&b, src, cap.src_end-src); - luaL_pushresult(&b); - lua_pushnumber(L, n); /* number of substitutions */ - return 2; -} - -/* }====================================================== */ - - -static void luaI_addquoted (lua_State *L, luaL_Buffer *b, int arg) { - size_t l; - const char *s = luaL_check_lstr(L, arg, &l); - luaL_putchar(b, '"'); - while (l--) { - switch (*s) { - case '"': case '\\': case '\n': - luaL_putchar(b, '\\'); - luaL_putchar(b, *s); - break; - case '\0': luaL_addlstring(b, "\\000", 4); break; - default: luaL_putchar(b, *s); - } - s++; - } - luaL_putchar(b, '"'); -} - -/* maximum size of each formatted item (> len(format('%99.99f', -1e308))) */ -#define MAX_ITEM 512 -/* maximum size of each format specification (such as '%-099.99d') */ -#define MAX_FORMAT 20 - -static int str_format (lua_State *L) { - int arg = 1; - const char *strfrmt = luaL_check_string(L, arg); - luaL_Buffer b; - luaL_buffinit(L, &b); - while (*strfrmt) { - if (*strfrmt != '%') - luaL_putchar(&b, *strfrmt++); - else if (*++strfrmt == '%') - luaL_putchar(&b, *strfrmt++); /* %% */ - else { /* format item */ - struct Capture cap; - char form[MAX_FORMAT]; /* to store the format ('%...') */ - char buff[MAX_ITEM]; /* to store the formatted item */ - const char *initf = strfrmt; - form[0] = '%'; - if (isdigit((unsigned char)*initf) && *(initf+1) == '$') { - arg = *initf - '0'; - initf += 2; /* skip the 'n$' */ - } - arg++; - cap.src_end = strfrmt+strlen(strfrmt)+1; - cap.level = 0; - strfrmt = match(L, initf, "[-+ #0]*(%d*)%.?(%d*)", &cap); - if (cap.capture[0].len > 2 || cap.capture[1].len > 2 || /* < 100? */ - strfrmt-initf > MAX_FORMAT-2) - lua_error(L, "invalid format (width or precision too long)"); - strncpy(form+1, initf, strfrmt-initf+1); /* +1 to include conversion */ - form[strfrmt-initf+2] = 0; - switch (*strfrmt++) { - case 'c': case 'd': case 'i': - sprintf(buff, form, luaL_check_int(L, arg)); - break; - case 'o': case 'u': case 'x': case 'X': - sprintf(buff, form, (unsigned int)luaL_check_number(L, arg)); - break; - case 'e': case 'E': case 'f': case 'g': case 'G': - sprintf(buff, form, luaL_check_number(L, arg)); - break; - case 'q': - luaI_addquoted(L, &b, arg); - continue; /* skip the "addsize" at the end */ - case 's': { - size_t l; - const char *s = luaL_check_lstr(L, arg, &l); - if (cap.capture[1].len == 0 && l >= 100) { - /* no precision and string is too long to be formatted; - keep original string */ - lua_pushvalue(L, arg); - luaL_addvalue(&b); - continue; /* skip the "addsize" at the end */ - } - else { - sprintf(buff, form, s); - break; - } - } - default: /* also treat cases 'pnLlh' */ - lua_error(L, "invalid option in `format'"); - } - luaL_addlstring(&b, buff, strlen(buff)); - } - } - luaL_pushresult(&b); - return 1; -} - - -static const struct luaL_reg strlib[] = { -{"strlen", str_len}, -{"strsub", str_sub}, -{"strlower", str_lower}, -{"strupper", str_upper}, -{"strchar", str_char}, -{"strrep", str_rep}, -{"ascii", str_byte}, /* for compatibility with 3.0 and earlier */ -{"strbyte", str_byte}, -{"format", str_format}, -{"strfind", str_find}, -{"gsub", str_gsub} -}; - - -/* -** Open string library -*/ -LUALIB_API void lua_strlibopen (lua_State *L) { - luaL_openl(L, strlib); -} |