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-rw-r--r--src/lua/lstrlib.c621
1 files changed, 621 insertions, 0 deletions
diff --git a/src/lua/lstrlib.c b/src/lua/lstrlib.c
new file mode 100644
index 00000000..051eccf7
--- /dev/null
+++ b/src/lua/lstrlib.c
@@ -0,0 +1,621 @@
+/*
+** $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);
+}
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