| /* |
| ** $Id: lstrlib.c,v 1.6 1998/01/09 14:44:55 roberto Exp $ |
| ** Standard library for strings and pattern-matching |
| ** See Copyright Notice in lua.h |
| */ |
| |
| |
| #include <ctype.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include "lauxlib.h" |
| #include "lua.h" |
| #include "lualib.h" |
| |
| |
| |
| static void addnchar (char *s, int n) |
| { |
| char *b = luaL_openspace(n); |
| strncpy(b, s, n); |
| luaL_addsize(n); |
| } |
| |
| |
| static void addstr (char *s) |
| { |
| addnchar(s, strlen(s)); |
| } |
| |
| |
| static void str_len (void) |
| { |
| lua_pushnumber(strlen(luaL_check_string(1))); |
| } |
| |
| |
| static void closeandpush (void) |
| { |
| luaL_addchar(0); |
| lua_pushstring(luaL_buffer()); |
| } |
| |
| |
| static void str_sub (void) |
| { |
| char *s = luaL_check_string(1); |
| long l = strlen(s); |
| long start = (long)luaL_check_number(2); |
| long end = (long)luaL_opt_number(3, -1); |
| if (start < 0) start = l+start+1; |
| if (end < 0) end = l+end+1; |
| if (1 <= start && start <= end && end <= l) { |
| luaL_resetbuffer(); |
| addnchar(s+start-1, end-start+1); |
| closeandpush(); |
| } |
| else lua_pushstring(""); |
| } |
| |
| |
| static void str_lower (void) |
| { |
| char *s; |
| luaL_resetbuffer(); |
| for (s = luaL_check_string(1); *s; s++) |
| luaL_addchar(tolower((unsigned char)*s)); |
| closeandpush(); |
| } |
| |
| |
| static void str_upper (void) |
| { |
| char *s; |
| luaL_resetbuffer(); |
| for (s = luaL_check_string(1); *s; s++) |
| luaL_addchar(toupper((unsigned char)*s)); |
| closeandpush(); |
| } |
| |
| static void str_rep (void) |
| { |
| char *s = luaL_check_string(1); |
| int n = (int)luaL_check_number(2); |
| luaL_resetbuffer(); |
| while (n-- > 0) |
| addstr(s); |
| closeandpush(); |
| } |
| |
| |
| static void str_ascii (void) |
| { |
| char *s = luaL_check_string(1); |
| long pos = (long)luaL_opt_number(2, 1) - 1; |
| luaL_arg_check(0<=pos && pos<strlen(s), 2, "out of range"); |
| lua_pushnumber((unsigned char)s[pos]); |
| } |
| |
| |
| |
| /* |
| ** ======================================================= |
| ** PATTERN MATCHING |
| ** ======================================================= |
| */ |
| |
| #define MAX_CAPT 9 |
| |
| struct Capture { |
| int level; /* total number of captures (finished or unfinished) */ |
| struct { |
| char *init; |
| int len; /* -1 signals unfinished capture */ |
| } capture[MAX_CAPT]; |
| }; |
| |
| |
| #define ESC '%' |
| #define SPECIALS "^$*?.([%-" |
| |
| |
| static void push_captures (struct Capture *cap) |
| { |
| int i; |
| for (i=0; i<cap->level; i++) { |
| int l = cap->capture[i].len; |
| char *buff = luaL_openspace(l+1); |
| if (l == -1) lua_error("unfinished capture"); |
| strncpy(buff, cap->capture[i].init, l); |
| buff[l] = 0; |
| lua_pushstring(buff); |
| } |
| } |
| |
| |
| static int check_cap (int l, struct Capture *cap) |
| { |
| l -= '1'; |
| if (!(0 <= l && l < cap->level && cap->capture[l].len != -1)) |
| lua_error("invalid capture index"); |
| return l; |
| } |
| |
| |
| static int capture_to_close (struct Capture *cap) |
| { |
| int level = cap->level; |
| for (level--; level>=0; level--) |
| if (cap->capture[level].len == -1) return level; |
| lua_error("invalid pattern capture"); |
| return 0; /* to avoid warnings */ |
| } |
| |
| |
| static char *bracket_end (char *p) |
| { |
| return (*p == 0) ? NULL : strchr((*p=='^') ? p+2 : p+1, ']'); |
| } |
| |
| |
| static int matchclass (int c, int cl) |
| { |
| int res; |
| if (c == 0) return 0; |
| switch (tolower((unsigned char)cl)) { |
| case 'w' : res = isalnum((unsigned char)c); break; |
| case 'd' : res = isdigit((unsigned char)c); break; |
| case 's' : res = isspace((unsigned char)c); break; |
| case 'a' : res = isalpha((unsigned char)c); break; |
| case 'p' : res = ispunct((unsigned char)c); break; |
| case 'l' : res = islower((unsigned char)c); break; |
| case 'u' : res = isupper((unsigned char)c); break; |
| case 'c' : res = iscntrl((unsigned char)c); break; |
| default: return (cl == c); |
| } |
| return (islower((unsigned char)cl) ? res : !res); |
| } |
| |
| |
| int luaI_singlematch (int c, char *p, char **ep) |
| { |
| switch (*p) { |
| case '.': |
| *ep = p+1; |
| return (c != 0); |
| case '\0': |
| *ep = p; |
| return 0; |
| case ESC: |
| if (*(++p) == '\0') |
| luaL_verror("incorrect pattern (ends with `%c')", ESC); |
| *ep = p+1; |
| return matchclass(c, *p); |
| case '[': { |
| char *end = bracket_end(p+1); |
| int sig = *(p+1) == '^' ? (p++, 0) : 1; |
| if (end == NULL) lua_error("incorrect pattern (missing `]')"); |
| *ep = end+1; |
| if (c == 0) return 0; |
| while (++p < end) { |
| if (*p == ESC) { |
| if (((p+1) < end) && matchclass(c, *++p)) return sig; |
| } |
| else if ((*(p+1) == '-') && (p+2 < end)) { |
| p+=2; |
| if (*(p-2) <= c && c <= *p) return sig; |
| } |
| else if (*p == c) return sig; |
| } |
| return !sig; |
| } |
| default: |
| *ep = p+1; |
| return (*p == c); |
| } |
| } |
| |
| |
| static char *matchbalance (char *s, int b, int e) |
| { |
| if (*s != b) return NULL; |
| else { |
| int cont = 1; |
| while (*(++s)) { |
| if (*s == e) { |
| if (--cont == 0) return s+1; |
| } |
| else if (*s == b) cont++; |
| } |
| } |
| return NULL; /* string ends out of balance */ |
| } |
| |
| |
| static char *matchitem (char *s, char *p, struct Capture *cap, char **ep) |
| { |
| if (*p == ESC) { |
| p++; |
| if (isdigit((unsigned char)*p)) { /* capture */ |
| int l = check_cap(*p, cap); |
| *ep = p+1; |
| if (strncmp(cap->capture[l].init, s, cap->capture[l].len) == 0) |
| return s+cap->capture[l].len; |
| else return NULL; |
| } |
| else if (*p == 'b') { /* balanced string */ |
| p++; |
| if (*p == 0 || *(p+1) == 0) |
| lua_error("unbalanced pattern"); |
| *ep = p+2; |
| return matchbalance(s, *p, *(p+1)); |
| } |
| else p--; /* and go through */ |
| } |
| return (luaI_singlematch(*s, p, ep) ? s+1 : NULL); |
| } |
| |
| |
| static char *match (char *s, char *p, struct Capture *cap) |
| { |
| init: /* using goto's to optimize tail recursion */ |
| switch (*p) { |
| case '(': { /* start capture */ |
| char *res; |
| if (cap->level >= MAX_CAPT) lua_error("too many captures"); |
| cap->capture[cap->level].init = s; |
| cap->capture[cap->level].len = -1; |
| cap->level++; |
| if ((res=match(s, p+1, cap)) == NULL) /* match failed? */ |
| cap->level--; /* undo capture */ |
| return res; |
| } |
| case ')': { /* end capture */ |
| int l = capture_to_close(cap); |
| char *res; |
| cap->capture[l].len = s - cap->capture[l].init; /* close capture */ |
| if ((res = match(s, p+1, cap)) == NULL) /* match failed? */ |
| cap->capture[l].len = -1; /* undo capture */ |
| return res; |
| } |
| case '\0': case '$': /* (possibly) end of pattern */ |
| if (*p == 0 || (*(p+1) == 0 && *s == 0)) |
| return s; |
| /* else go through */ |
| default: { /* it is a pattern item */ |
| char *ep; /* get what is next */ |
| char *s1 = matchitem(s, p, cap, &ep); |
| switch (*ep) { |
| case '*': { /* repetition */ |
| char *res; |
| if (s1 && (res = match(s1, p, cap))) |
| return res; |
| p=ep+1; goto init; /* else return match(s, ep+1, cap); */ |
| } |
| case '?': { /* optional */ |
| char *res; |
| if (s1 && (res = match(s1, ep+1, cap))) |
| return res; |
| p=ep+1; goto init; /* else return match(s, ep+1, cap); */ |
| } |
| case '-': { /* repetition */ |
| char *res; |
| if ((res = match(s, ep+1, cap)) != 0) |
| return res; |
| else if (s1) { |
| s = s1; |
| goto init; /* return match(s1, p, cap); */ |
| } |
| else |
| return NULL; |
| } |
| default: |
| if (s1) { s=s1; p=ep; goto init; } /* return match(s1, ep, cap); */ |
| else return NULL; |
| } |
| } |
| } |
| } |
| |
| |
| static void str_find (void) |
| { |
| char *s = luaL_check_string(1); |
| char *p = luaL_check_string(2); |
| long init = (long)luaL_opt_number(3, 1) - 1; |
| luaL_arg_check(0 <= init && init <= strlen(s), 3, "out of range"); |
| if (lua_getparam(4) != LUA_NOOBJECT || |
| strpbrk(p, SPECIALS) == NULL) { /* no special caracters? */ |
| char *s2 = strstr(s+init, p); |
| if (s2) { |
| lua_pushnumber(s2-s+1); |
| lua_pushnumber(s2-s+strlen(p)); |
| } |
| } |
| else { |
| int anchor = (*p == '^') ? (p++, 1) : 0; |
| char *s1=s+init; |
| do { |
| struct Capture cap; |
| char *res; |
| cap.level = 0; |
| if ((res=match(s1, p, &cap)) != NULL) { |
| lua_pushnumber(s1-s+1); /* start */ |
| lua_pushnumber(res-s); /* end */ |
| push_captures(&cap); |
| return; |
| } |
| } while (*s1++ && !anchor); |
| } |
| } |
| |
| |
| static void add_s (lua_Object newp, struct Capture *cap) |
| { |
| if (lua_isstring(newp)) { |
| char *news = lua_getstring(newp); |
| while (*news) { |
| if (*news != ESC || !isdigit((unsigned char)*++news)) |
| luaL_addchar(*news++); |
| else { |
| int l = check_cap(*news++, cap); |
| addnchar(cap->capture[l].init, cap->capture[l].len); |
| } |
| } |
| } |
| else if (lua_isfunction(newp)) { |
| lua_Object res; |
| int status; |
| int oldbuff; |
| lua_beginblock(); |
| push_captures(cap); |
| /* function may use buffer, so save it and create a new one */ |
| oldbuff = luaL_newbuffer(0); |
| status = lua_callfunction(newp); |
| /* restore old buffer */ |
| luaL_oldbuffer(oldbuff); |
| if (status != 0) { |
| lua_endblock(); |
| lua_error(NULL); |
| } |
| res = lua_getresult(1); |
| addstr(lua_isstring(res) ? lua_getstring(res) : ""); |
| lua_endblock(); |
| } |
| else luaL_arg_check(0, 3, "string or function expected"); |
| } |
| |
| |
| static void str_gsub (void) |
| { |
| char *src = luaL_check_string(1); |
| char *p = luaL_check_string(2); |
| lua_Object newp = lua_getparam(3); |
| int max_s = (int)luaL_opt_number(4, strlen(src)+1); |
| int anchor = (*p == '^') ? (p++, 1) : 0; |
| int n = 0; |
| luaL_resetbuffer(); |
| while (n < max_s) { |
| struct Capture cap; |
| char *e; |
| cap.level = 0; |
| e = match(src, p, &cap); |
| if (e) { |
| n++; |
| add_s(newp, &cap); |
| } |
| if (e && e>src) /* non empty match? */ |
| src = e; /* skip it */ |
| else if (*src) |
| luaL_addchar(*src++); |
| else break; |
| if (anchor) break; |
| } |
| addstr(src); |
| closeandpush(); |
| lua_pushnumber(n); /* number of substitutions */ |
| } |
| |
| |
| static void luaI_addquoted (char *s) |
| { |
| luaL_addchar('"'); |
| for (; *s; s++) { |
| if (strchr("\"\\\n", *s)) |
| luaL_addchar('\\'); |
| luaL_addchar(*s); |
| } |
| luaL_addchar('"'); |
| } |
| |
| #define MAX_FORMAT 200 |
| |
| static void str_format (void) |
| { |
| int arg = 1; |
| char *strfrmt = luaL_check_string(arg); |
| luaL_resetbuffer(); |
| while (*strfrmt) { |
| if (*strfrmt != '%') |
| luaL_addchar(*strfrmt++); |
| else if (*++strfrmt == '%') |
| luaL_addchar(*strfrmt++); /* %% */ |
| else { /* format item */ |
| char form[MAX_FORMAT]; /* store the format ('%...') */ |
| struct Capture cap; |
| char *buff; |
| char *initf = strfrmt; |
| form[0] = '%'; |
| cap.level = 0; |
| strfrmt = match(strfrmt, "%d?%$?[-+ #]*(%d*)%.?(%d*)", &cap); |
| if (cap.capture[0].len > 3 || cap.capture[1].len > 3) /* < 1000? */ |
| lua_error("invalid format (width or precision too long)"); |
| if (isdigit((unsigned char)initf[0]) && initf[1] == '$') { |
| arg = initf[0] - '0'; |
| initf += 2; /* skip the 'n$' */ |
| } |
| arg++; |
| strncpy(form+1, initf, strfrmt-initf+1); /* +1 to include convertion */ |
| form[strfrmt-initf+2] = 0; |
| buff = luaL_openspace(1000); /* to store the formatted value */ |
| switch (*strfrmt++) { |
| case 'q': |
| luaI_addquoted(luaL_check_string(arg)); |
| continue; |
| case 's': { |
| char *s = luaL_check_string(arg); |
| buff = luaL_openspace(strlen(s)); |
| sprintf(buff, form, s); |
| break; |
| } |
| case 'c': case 'd': case 'i': case 'o': |
| case 'u': case 'x': case 'X': |
| sprintf(buff, form, (int)luaL_check_number(arg)); |
| break; |
| case 'e': case 'E': case 'f': case 'g': case 'G': |
| sprintf(buff, form, luaL_check_number(arg)); |
| break; |
| default: /* also treat cases 'pnLlh' */ |
| lua_error("invalid option in `format'"); |
| } |
| luaL_addsize(strlen(buff)); |
| } |
| } |
| closeandpush(); /* push the result */ |
| } |
| |
| |
| static struct luaL_reg strlib[] = { |
| {"strlen", str_len}, |
| {"strsub", str_sub}, |
| {"strlower", str_lower}, |
| {"strupper", str_upper}, |
| {"strrep", str_rep}, |
| {"ascii", str_ascii}, |
| {"format", str_format}, |
| {"strfind", str_find}, |
| {"gsub", str_gsub} |
| }; |
| |
| |
| /* |
| ** Open string library |
| */ |
| void strlib_open (void) |
| { |
| luaL_openlib(strlib, (sizeof(strlib)/sizeof(strlib[0]))); |
| } |