mirror of
https://github.com/lua/lua.git
synced 2024-11-24 10:43:44 +08:00
682 lines
18 KiB
C
682 lines
18 KiB
C
/*
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** $Id: lstrlib.c,v 1.71 2001/08/31 19:46:07 roberto Exp $
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** Standard library for string operations and pattern-matching
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** See Copyright Notice in lua.h
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*/
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#include <ctype.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define LUA_PRIVATE
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#include "lua.h"
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#include "lauxlib.h"
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#include "lualib.h"
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typedef long sint32; /* a signed version for size_t */
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static int str_len (lua_State *L) {
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size_t l;
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luaL_check_lstr(L, 1, &l);
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lua_pushnumber(L, l);
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return 1;
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}
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static sint32 posrelat (sint32 pos, size_t len) {
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/* relative string position: negative means back from end */
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return (pos>=0) ? pos : (sint32)len+pos+1;
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}
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static int str_sub (lua_State *L) {
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size_t l;
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const l_char *s = luaL_check_lstr(L, 1, &l);
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sint32 start = posrelat(luaL_check_long(L, 2), l);
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sint32 end = posrelat(luaL_opt_long(L, 3, -1), l);
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if (start < 1) start = 1;
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if (end > (sint32)l) end = l;
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if (start <= end)
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lua_pushlstring(L, s+start-1, end-start+1);
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else lua_pushliteral(L, l_s(""));
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return 1;
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}
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static int str_lower (lua_State *L) {
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size_t l;
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size_t i;
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luaL_Buffer b;
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const l_char *s = luaL_check_lstr(L, 1, &l);
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luaL_buffinit(L, &b);
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for (i=0; i<l; i++)
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luaL_putchar(&b, tolower(uchar(s[i])));
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luaL_pushresult(&b);
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return 1;
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}
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static int str_upper (lua_State *L) {
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size_t l;
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size_t i;
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luaL_Buffer b;
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const l_char *s = luaL_check_lstr(L, 1, &l);
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luaL_buffinit(L, &b);
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for (i=0; i<l; i++)
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luaL_putchar(&b, toupper(uchar(s[i])));
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luaL_pushresult(&b);
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return 1;
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}
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static int str_rep (lua_State *L) {
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size_t l;
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luaL_Buffer b;
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const l_char *s = luaL_check_lstr(L, 1, &l);
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int n = luaL_check_int(L, 2);
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luaL_buffinit(L, &b);
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while (n-- > 0)
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luaL_addlstring(&b, s, l);
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luaL_pushresult(&b);
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return 1;
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}
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static int str_concat (lua_State *L) {
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luaL_Buffer b;
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size_t lsep;
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const char *sep = luaL_opt_lstr(L, 2, "", &lsep);
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int n, i;
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luaL_checktype(L, 1, LUA_TTABLE);
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luaL_buffinit(L, &b);
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n = lua_getn(L, 1);
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for (i=1; i<=n; i++) {
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lua_rawgeti(L, 1, i);
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luaL_addvalue(&b);
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if (i != n)
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luaL_addlstring(&b, sep, lsep);
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}
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luaL_pushresult(&b);
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return 1;
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}
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static int str_byte (lua_State *L) {
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size_t l;
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const l_char *s = luaL_check_lstr(L, 1, &l);
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sint32 pos = posrelat(luaL_opt_long(L, 2, 1), l);
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luaL_arg_check(L, 0 < pos && (size_t)(pos) <= l, 2, l_s("out of range"));
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lua_pushnumber(L, uchar(s[pos-1]));
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return 1;
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}
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static int str_char (lua_State *L) {
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int n = lua_gettop(L); /* number of arguments */
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int i;
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luaL_Buffer b;
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luaL_buffinit(L, &b);
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for (i=1; i<=n; i++) {
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int c = luaL_check_int(L, i);
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luaL_arg_check(L, uchar(c) == c, i, l_s("invalid value"));
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luaL_putchar(&b, uchar(c));
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}
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luaL_pushresult(&b);
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return 1;
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}
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/*
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** {======================================================
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** PATTERN MATCHING
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** =======================================================
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*/
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#ifndef MAX_CAPTURES
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#define MAX_CAPTURES 32 /* arbitrary limit */
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#endif
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#define CAP_UNFINISHED (-1)
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#define CAP_POSITION (-2)
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typedef struct MatchState {
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const l_char *src_init; /* init of source string */
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const l_char *src_end; /* end (`\0') of source string */
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int level; /* total number of captures (finished or unfinished) */
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struct {
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const l_char *init;
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sint32 len;
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} capture[MAX_CAPTURES];
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lua_State *L;
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} MatchState;
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#define ESC l_c('%')
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#define SPECIALS l_s("^$*+?.([%-")
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static int check_capture (MatchState *ms, int l) {
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l -= l_c('1');
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if (l < 0 || l >= ms->level || ms->capture[l].len == CAP_UNFINISHED)
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lua_error(ms->L, l_s("invalid capture index"));
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return l;
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}
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static int capture_to_close (MatchState *ms) {
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int level = ms->level;
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for (level--; level>=0; level--)
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if (ms->capture[level].len == CAP_UNFINISHED) return level;
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lua_error(ms->L, l_s("invalid pattern capture"));
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return 0; /* to avoid warnings */
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}
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static const l_char *luaI_classend (MatchState *ms, const l_char *p) {
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switch (*p++) {
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case ESC:
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if (*p == l_c('\0'))
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lua_error(ms->L, l_s("malformed pattern (ends with `%')"));
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return p+1;
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case l_c('['):
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if (*p == l_c('^')) p++;
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do { /* look for a `]' */
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if (*p == l_c('\0'))
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lua_error(ms->L, l_s("malformed pattern (missing `]')"));
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if (*(p++) == ESC && *p != l_c('\0'))
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p++; /* skip escapes (e.g. `%]') */
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} while (*p != l_c(']'));
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return p+1;
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default:
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return p;
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}
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}
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static int match_class (l_charint c, l_charint cl) {
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int res;
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switch (tolower(cl)) {
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case l_c('a') : res = isalpha(c); break;
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case l_c('c') : res = iscntrl(c); break;
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case l_c('d') : res = isdigit(c); break;
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case l_c('l') : res = islower(c); break;
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case l_c('p') : res = ispunct(c); break;
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case l_c('s') : res = isspace(c); break;
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case l_c('u') : res = isupper(c); break;
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case l_c('w') : res = isalnum(c); break;
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case l_c('x') : res = isxdigit(c); break;
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case l_c('z') : res = (c == 0); break;
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default: return (cl == c);
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}
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return (islower(cl) ? res : !res);
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}
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static int matchbracketclass (l_charint c, const l_char *p, const l_char *ec) {
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int sig = 1;
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if (*(p+1) == l_c('^')) {
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sig = 0;
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p++; /* skip the `^' */
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}
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while (++p < ec) {
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if (*p == ESC) {
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p++;
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if (match_class(c, *p))
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return sig;
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}
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else if ((*(p+1) == l_c('-')) && (p+2 < ec)) {
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p+=2;
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if (uchar(*(p-2)) <= c && c <= uchar(*p))
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return sig;
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}
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else if (uchar(*p) == c) return sig;
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}
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return !sig;
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}
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static int luaI_singlematch (l_charint c, const l_char *p, const l_char *ep) {
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switch (*p) {
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case l_c('.'): /* matches any char */
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return 1;
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case ESC:
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return match_class(c, *(p+1));
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case l_c('['):
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return matchbracketclass(c, p, ep-1);
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default:
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return (uchar(*p) == c);
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}
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}
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static const l_char *match (MatchState *ms, const l_char *s, const l_char *p);
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static const l_char *matchbalance (MatchState *ms, const l_char *s,
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const l_char *p) {
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if (*p == 0 || *(p+1) == 0)
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lua_error(ms->L, l_s("unbalanced pattern"));
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if (*s != *p) return NULL;
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else {
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int b = *p;
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int e = *(p+1);
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int cont = 1;
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while (++s < ms->src_end) {
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if (*s == e) {
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if (--cont == 0) return s+1;
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}
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else if (*s == b) cont++;
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}
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}
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return NULL; /* string ends out of balance */
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}
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static const l_char *max_expand (MatchState *ms, const l_char *s,
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const l_char *p, const l_char *ep) {
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sint32 i = 0; /* counts maximum expand for item */
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while ((s+i)<ms->src_end && luaI_singlematch(uchar(*(s+i)), p, ep))
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i++;
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/* keeps trying to match with the maximum repetitions */
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while (i>=0) {
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const l_char *res = match(ms, (s+i), ep+1);
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if (res) return res;
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i--; /* else didn't match; reduce 1 repetition to try again */
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}
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return NULL;
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}
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static const l_char *min_expand (MatchState *ms, const l_char *s,
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const l_char *p, const l_char *ep) {
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for (;;) {
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const l_char *res = match(ms, s, ep+1);
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if (res != NULL)
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return res;
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else if (s<ms->src_end && luaI_singlematch(uchar(*s), p, ep))
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s++; /* try with one more repetition */
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else return NULL;
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}
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}
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static const l_char *start_capture (MatchState *ms, const l_char *s,
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const l_char *p, int what) {
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const l_char *res;
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int level = ms->level;
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if (level >= MAX_CAPTURES) lua_error(ms->L, l_s("too many captures"));
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ms->capture[level].init = s;
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ms->capture[level].len = what;
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ms->level = level+1;
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if ((res=match(ms, s, p)) == NULL) /* match failed? */
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ms->level--; /* undo capture */
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return res;
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}
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static const l_char *end_capture (MatchState *ms, const l_char *s,
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const l_char *p) {
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int l = capture_to_close(ms);
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const l_char *res;
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ms->capture[l].len = s - ms->capture[l].init; /* close capture */
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if ((res = match(ms, s, p)) == NULL) /* match failed? */
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ms->capture[l].len = CAP_UNFINISHED; /* undo capture */
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return res;
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}
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static const l_char *match_capture (MatchState *ms, const l_char *s, int l) {
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size_t len;
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l = check_capture(ms, l);
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len = ms->capture[l].len;
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if ((size_t)(ms->src_end-s) >= len &&
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memcmp(ms->capture[l].init, s, len) == 0)
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return s+len;
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else return NULL;
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}
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static const l_char *match (MatchState *ms, const l_char *s, const l_char *p) {
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init: /* using goto's to optimize tail recursion */
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switch (*p) {
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case l_c('('): /* start capture */
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if (*(p+1) == l_c(')')) /* position capture? */
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return start_capture(ms, s, p+2, CAP_POSITION);
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else
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return start_capture(ms, s, p+1, CAP_UNFINISHED);
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case l_c(')'): /* end capture */
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return end_capture(ms, s, p+1);
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case ESC: /* may be %[0-9] or %b */
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if (isdigit(uchar(*(p+1)))) { /* capture? */
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s = match_capture(ms, s, *(p+1));
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if (s == NULL) return NULL;
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p+=2; goto init; /* else return match(ms, s, p+2) */
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}
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else if (*(p+1) == l_c('b')) { /* balanced string? */
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s = matchbalance(ms, s, p+2);
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if (s == NULL) return NULL;
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p+=4; goto init; /* else return match(ms, s, p+4); */
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}
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else goto dflt; /* case default */
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case l_c('\0'): /* end of pattern */
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return s; /* match succeeded */
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case l_c('$'):
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if (*(p+1) == l_c('\0')) /* is the `$' the last char in pattern? */
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return (s == ms->src_end) ? s : NULL; /* check end of string */
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else goto dflt;
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default: dflt: { /* it is a pattern item */
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const l_char *ep = luaI_classend(ms, p); /* points to what is next */
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int m = s<ms->src_end && luaI_singlematch(uchar(*s), p, ep);
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switch (*ep) {
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case l_c('?'): { /* optional */
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const l_char *res;
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if (m && ((res=match(ms, s+1, ep+1)) != NULL))
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return res;
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p=ep+1; goto init; /* else return match(ms, s, ep+1); */
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}
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case l_c('*'): /* 0 or more repetitions */
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return max_expand(ms, s, p, ep);
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case l_c('+'): /* 1 or more repetitions */
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return (m ? max_expand(ms, s+1, p, ep) : NULL);
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case l_c('-'): /* 0 or more repetitions (minimum) */
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return min_expand(ms, s, p, ep);
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default:
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if (!m) return NULL;
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s++; p=ep; goto init; /* else return match(ms, s+1, ep); */
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}
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}
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}
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}
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static const l_char *lmemfind (const l_char *s1, size_t l1,
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const l_char *s2, size_t l2) {
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if (l2 == 0) return s1; /* empty strings are everywhere */
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else if (l2 > l1) return NULL; /* avoids a negative `l1' */
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else {
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const l_char *init; /* to search for a `*s2' inside `s1' */
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l2--; /* 1st char will be checked by `memchr' */
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l1 = l1-l2; /* `s2' cannot be found after that */
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while (l1 > 0 && (init = (const l_char *)memchr(s1, *s2, l1)) != NULL) {
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init++; /* 1st char is already checked */
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if (memcmp(init, s2+1, l2) == 0)
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return init-1;
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else { /* correct `l1' and `s1' to try again */
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l1 -= init-s1;
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s1 = init;
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}
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}
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return NULL; /* not found */
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}
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}
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static void push_onecapture (MatchState *ms, int i) {
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int l = ms->capture[i].len;
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if (l == CAP_UNFINISHED) lua_error(ms->L, l_s("unfinished capture"));
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if (l == CAP_POSITION)
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lua_pushnumber(ms->L, ms->capture[i].init - ms->src_init + 1);
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else
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lua_pushlstring(ms->L, ms->capture[i].init, l);
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}
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static int push_captures (MatchState *ms) {
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int i;
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luaL_checkstack(ms->L, ms->level, l_s("too many captures"));
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for (i=0; i<ms->level; i++)
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push_onecapture(ms, i);
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return ms->level; /* number of strings pushed */
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}
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static int str_find (lua_State *L) {
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size_t l1, l2;
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const l_char *s = luaL_check_lstr(L, 1, &l1);
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const l_char *p = luaL_check_lstr(L, 2, &l2);
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sint32 init = posrelat(luaL_opt_long(L, 3, 1), l1) - 1;
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luaL_arg_check(L, 0 <= init && (size_t)(init) <= l1, 3, l_s("out of range"));
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if (lua_gettop(L) > 3 || /* extra argument? */
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strpbrk(p, SPECIALS) == NULL) { /* or no special characters? */
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const l_char *s2 = lmemfind(s+init, l1-init, p, l2);
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if (s2) {
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lua_pushnumber(L, s2-s+1);
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lua_pushnumber(L, s2-s+l2);
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return 2;
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}
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}
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else {
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MatchState ms;
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int anchor = (*p == l_c('^')) ? (p++, 1) : 0;
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const l_char *s1=s+init;
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ms.L = L;
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ms.src_init = s;
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ms.src_end = s+l1;
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do {
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const l_char *res;
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ms.level = 0;
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if ((res=match(&ms, s1, p)) != NULL) {
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lua_pushnumber(L, s1-s+1); /* start */
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lua_pushnumber(L, res-s); /* end */
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return push_captures(&ms) + 2;
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}
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} while (s1++<ms.src_end && !anchor);
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}
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lua_pushnil(L); /* not found */
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return 1;
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}
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static void add_s (MatchState *ms, luaL_Buffer *b) {
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lua_State *L = ms->L;
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if (lua_isstring(L, 3)) {
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const l_char *news = lua_tostring(L, 3);
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size_t l = lua_strlen(L, 3);
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size_t i;
|
|
for (i=0; i<l; i++) {
|
|
if (news[i] != ESC)
|
|
luaL_putchar(b, news[i]);
|
|
else {
|
|
i++; /* skip ESC */
|
|
if (!isdigit(uchar(news[i])))
|
|
luaL_putchar(b, news[i]);
|
|
else {
|
|
int level = check_capture(ms, news[i]);
|
|
push_onecapture(ms, level);
|
|
luaL_addvalue(b); /* add capture to accumulated result */
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else { /* is a function */
|
|
int n;
|
|
lua_pushvalue(L, 3);
|
|
n = push_captures(ms);
|
|
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 l_char *src = luaL_check_lstr(L, 1, &srcl);
|
|
const l_char *p = luaL_check_string(L, 2);
|
|
int max_s = luaL_opt_int(L, 4, srcl+1);
|
|
int anchor = (*p == l_c('^')) ? (p++, 1) : 0;
|
|
int n = 0;
|
|
MatchState ms;
|
|
luaL_Buffer b;
|
|
luaL_arg_check(L,
|
|
lua_gettop(L) >= 3 && (lua_isstring(L, 3) || lua_isfunction(L, 3)),
|
|
3, l_s("string or function expected"));
|
|
luaL_buffinit(L, &b);
|
|
ms.L = L;
|
|
ms.src_init = src;
|
|
ms.src_end = src+srcl;
|
|
while (n < max_s) {
|
|
const l_char *e;
|
|
ms.level = 0;
|
|
e = match(&ms, src, p);
|
|
if (e) {
|
|
n++;
|
|
add_s(&ms, &b);
|
|
}
|
|
if (e && e>src) /* non empty match? */
|
|
src = e; /* skip it */
|
|
else if (src < ms.src_end)
|
|
luaL_putchar(&b, *src++);
|
|
else break;
|
|
if (anchor) break;
|
|
}
|
|
luaL_addlstring(&b, src, ms.src_end-src);
|
|
luaL_pushresult(&b);
|
|
lua_pushnumber(L, n); /* number of substitutions */
|
|
return 2;
|
|
}
|
|
|
|
/* }====================================================== */
|
|
|
|
|
|
/* 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 void luaI_addquoted (lua_State *L, luaL_Buffer *b, int arg) {
|
|
size_t l;
|
|
const l_char *s = luaL_check_lstr(L, arg, &l);
|
|
luaL_putchar(b, l_c('"'));
|
|
while (l--) {
|
|
switch (*s) {
|
|
case l_c('"'): case l_c('\\'): case l_c('\n'):
|
|
luaL_putchar(b, l_c('\\'));
|
|
luaL_putchar(b, *s);
|
|
break;
|
|
case l_c('\0'): luaL_addlstring(b, l_s("\\000"), 4); break;
|
|
default: luaL_putchar(b, *s);
|
|
}
|
|
s++;
|
|
}
|
|
luaL_putchar(b, l_c('"'));
|
|
}
|
|
|
|
|
|
static const l_char *scanformat (lua_State *L, const l_char *strfrmt,
|
|
l_char *form, int *hasprecision) {
|
|
const l_char *p = strfrmt;
|
|
while (strchr(l_s("-+ #0"), *p)) p++; /* skip flags */
|
|
if (isdigit(uchar(*p))) p++; /* skip width */
|
|
if (isdigit(uchar(*p))) p++; /* (2 digits at most) */
|
|
if (*p == l_c('.')) {
|
|
p++;
|
|
*hasprecision = 1;
|
|
if (isdigit(uchar(*p))) p++; /* skip precision */
|
|
if (isdigit(uchar(*p))) p++; /* (2 digits at most) */
|
|
}
|
|
if (isdigit(uchar(*p)))
|
|
lua_error(L, l_s("invalid format (width or precision too long)"));
|
|
if (p-strfrmt+2 > MAX_FORMAT) /* +2 to include `%' and the specifier */
|
|
lua_error(L, l_s("invalid format (too long)"));
|
|
form[0] = l_c('%');
|
|
strncpy(form+1, strfrmt, p-strfrmt+1);
|
|
form[p-strfrmt+2] = 0;
|
|
return p;
|
|
}
|
|
|
|
|
|
static int str_format (lua_State *L) {
|
|
int arg = 1;
|
|
size_t sfl;
|
|
const l_char *strfrmt = luaL_check_lstr(L, arg, &sfl);
|
|
const l_char *strfrmt_end = strfrmt+sfl;
|
|
luaL_Buffer b;
|
|
luaL_buffinit(L, &b);
|
|
while (strfrmt < strfrmt_end) {
|
|
if (*strfrmt != l_c('%'))
|
|
luaL_putchar(&b, *strfrmt++);
|
|
else if (*++strfrmt == l_c('%'))
|
|
luaL_putchar(&b, *strfrmt++); /* %% */
|
|
else { /* format item */
|
|
l_char form[MAX_FORMAT]; /* to store the format (`%...') */
|
|
l_char buff[MAX_ITEM]; /* to store the formatted item */
|
|
int hasprecision = 0;
|
|
if (isdigit(uchar(*strfrmt)) && *(strfrmt+1) == l_c('$'))
|
|
lua_error(L, l_s("obsolete `format' option (d$)"));
|
|
arg++;
|
|
strfrmt = scanformat(L, strfrmt, form, &hasprecision);
|
|
switch (*strfrmt++) {
|
|
case l_c('c'): case l_c('d'): case l_c('i'):
|
|
sprintf(buff, form, luaL_check_int(L, arg));
|
|
break;
|
|
case l_c('o'): case l_c('u'): case l_c('x'): case l_c('X'):
|
|
sprintf(buff, form, (unsigned int)(luaL_check_number(L, arg)));
|
|
break;
|
|
case l_c('e'): case l_c('E'): case l_c('f'):
|
|
case l_c('g'): case l_c('G'):
|
|
sprintf(buff, form, luaL_check_number(L, arg));
|
|
break;
|
|
case l_c('q'):
|
|
luaI_addquoted(L, &b, arg);
|
|
continue; /* skip the `addsize' at the end */
|
|
case l_c('s'): {
|
|
size_t l;
|
|
const l_char *s = luaL_check_lstr(L, arg, &l);
|
|
if (!hasprecision && 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, l_s("invalid option in `format'"));
|
|
}
|
|
luaL_addlstring(&b, buff, strlen(buff));
|
|
}
|
|
}
|
|
luaL_pushresult(&b);
|
|
return 1;
|
|
}
|
|
|
|
|
|
static const luaL_reg strlib[] = {
|
|
{l_s("strlen"), str_len},
|
|
{l_s("strsub"), str_sub},
|
|
{l_s("strlower"), str_lower},
|
|
{l_s("strupper"), str_upper},
|
|
{l_s("strchar"), str_char},
|
|
{l_s("strrep"), str_rep},
|
|
{l_s("strbyte"), str_byte},
|
|
{l_s("concat"), str_concat},
|
|
{l_s("format"), str_format},
|
|
{l_s("strfind"), str_find},
|
|
{l_s("gsub"), str_gsub}
|
|
};
|
|
|
|
|
|
/*
|
|
** Open string library
|
|
*/
|
|
LUALIB_API int lua_strlibopen (lua_State *L) {
|
|
luaL_openl(L, strlib);
|
|
return 0;
|
|
}
|