mirror of
https://github.com/KolibriOS/kolibrios.git
synced 2024-12-17 04:12:34 +03:00
970 lines
26 KiB
C
970 lines
26 KiB
C
/*
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** $Id: lstrlib.c,v 1.173 2011/11/30 18:24:56 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 lstrlib_c
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#define LUA_LIB
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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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/*
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** maximum number of captures that a pattern can do during
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** pattern-matching. This limit is arbitrary.
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*/
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#if !defined(LUA_MAXCAPTURES)
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#define LUA_MAXCAPTURES 32
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#endif
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/* macro to `unsign' a character */
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#define uchar(c) ((unsigned char)(c))
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static int str_len (lua_State *L) {
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size_t l;
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luaL_checklstring(L, 1, &l);
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lua_pushinteger(L, (lua_Integer)l);
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return 1;
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}
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/* translate a relative string position: negative means back from end */
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static size_t posrelat (ptrdiff_t pos, size_t len) {
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if (pos >= 0) return (size_t)pos;
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else if (0u - (size_t)pos > len) return 0;
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else return len - ((size_t)-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 char *s = luaL_checklstring(L, 1, &l);
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size_t start = posrelat(luaL_checkinteger(L, 2), l);
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size_t end = posrelat(luaL_optinteger(L, 3, -1), l);
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if (start < 1) start = 1;
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if (end > 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, "");
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return 1;
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}
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static int str_reverse (lua_State *L) {
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size_t l, i;
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luaL_Buffer b;
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const char *s = luaL_checklstring(L, 1, &l);
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char *p = luaL_buffinitsize(L, &b, l);
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for (i = 0; i < l; i++)
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p[i] = s[l - i - 1];
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luaL_pushresultsize(&b, l);
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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 char *s = luaL_checklstring(L, 1, &l);
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char *p = luaL_buffinitsize(L, &b, l);
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for (i=0; i<l; i++)
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p[i] = tolower(uchar(s[i]));
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luaL_pushresultsize(&b, l);
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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 char *s = luaL_checklstring(L, 1, &l);
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char *p = luaL_buffinitsize(L, &b, l);
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for (i=0; i<l; i++)
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p[i] = toupper(uchar(s[i]));
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luaL_pushresultsize(&b, l);
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return 1;
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}
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/* reasonable limit to avoid arithmetic overflow */
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#define MAXSIZE ((~(size_t)0) >> 1)
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static int str_rep (lua_State *L) {
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size_t l, lsep;
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const char *s = luaL_checklstring(L, 1, &l);
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int n = luaL_checkint(L, 2);
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const char *sep = luaL_optlstring(L, 3, "", &lsep);
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if (n <= 0) lua_pushliteral(L, "");
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else if (l + lsep < l || l + lsep >= MAXSIZE / n) /* may overflow? */
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return luaL_error(L, "resulting string too large");
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else {
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size_t totallen = n * l + (n - 1) * lsep;
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luaL_Buffer b;
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char *p = luaL_buffinitsize(L, &b, totallen);
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while (n-- > 1) { /* first n-1 copies (followed by separator) */
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memcpy(p, s, l * sizeof(char)); p += l;
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memcpy(p, sep, lsep * sizeof(char)); p += lsep;
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}
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memcpy(p, s, l * sizeof(char)); /* last copy (not followed by separator) */
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luaL_pushresultsize(&b, totallen);
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}
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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 char *s = luaL_checklstring(L, 1, &l);
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size_t posi = posrelat(luaL_optinteger(L, 2, 1), l);
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size_t pose = posrelat(luaL_optinteger(L, 3, posi), l);
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int n, i;
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if (posi < 1) posi = 1;
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if (pose > l) pose = l;
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if (posi > pose) return 0; /* empty interval; return no values */
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n = (int)(pose - posi + 1);
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if (posi + n <= pose) /* (size_t -> int) overflow? */
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return luaL_error(L, "string slice too long");
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luaL_checkstack(L, n, "string slice too long");
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for (i=0; i<n; i++)
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lua_pushinteger(L, uchar(s[posi+i-1]));
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return n;
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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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char *p = luaL_buffinitsize(L, &b, n);
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for (i=1; i<=n; i++) {
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int c = luaL_checkint(L, i);
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luaL_argcheck(L, uchar(c) == c, i, "value out of range");
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p[i - 1] = uchar(c);
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}
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luaL_pushresultsize(&b, n);
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return 1;
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}
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static int writer (lua_State *L, const void* b, size_t size, void* B) {
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(void)L;
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luaL_addlstring((luaL_Buffer*) B, (const char *)b, size);
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return 0;
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}
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static int str_dump (lua_State *L) {
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luaL_Buffer b;
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luaL_checktype(L, 1, LUA_TFUNCTION);
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lua_settop(L, 1);
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luaL_buffinit(L,&b);
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if (lua_dump(L, writer, &b) != 0)
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return luaL_error(L, "unable to dump given function");
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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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#define CAP_UNFINISHED (-1)
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#define CAP_POSITION (-2)
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typedef struct MatchState {
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const char *src_init; /* init of source string */
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const char *src_end; /* end ('\0') of source string */
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const char *p_end; /* end ('\0') of pattern */
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lua_State *L;
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int level; /* total number of captures (finished or unfinished) */
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struct {
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const char *init;
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ptrdiff_t len;
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} capture[LUA_MAXCAPTURES];
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} MatchState;
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#define L_ESC '%'
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#define SPECIALS "^$*+?.([%-"
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static int check_capture (MatchState *ms, int l) {
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l -= '1';
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if (l < 0 || l >= ms->level || ms->capture[l].len == CAP_UNFINISHED)
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return luaL_error(ms->L, "invalid capture index %%%d", l + 1);
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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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return luaL_error(ms->L, "invalid pattern capture");
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}
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static const char *classend (MatchState *ms, const char *p) {
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switch (*p++) {
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case L_ESC: {
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if (p == ms->p_end)
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luaL_error(ms->L, "malformed pattern (ends with " LUA_QL("%%") ")");
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return p+1;
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}
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case '[': {
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if (*p == '^') p++;
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do { /* look for a `]' */
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if (p == ms->p_end)
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luaL_error(ms->L, "malformed pattern (missing " LUA_QL("]") ")");
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if (*(p++) == L_ESC && p < ms->p_end)
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p++; /* skip escapes (e.g. `%]') */
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} while (*p != ']');
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return p+1;
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}
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default: {
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return p;
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}
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}
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}
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static int match_class (int c, int cl) {
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int res;
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switch (tolower(cl)) {
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case 'a' : res = isalpha(c); break;
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case 'c' : res = iscntrl(c); break;
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case 'd' : res = isdigit(c); break;
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case 'g' : res = isgraph(c); break;
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case 'l' : res = islower(c); break;
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case 'p' : res = ispunct(c); break;
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case 's' : res = isspace(c); break;
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case 'u' : res = isupper(c); break;
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case 'w' : res = isalnum(c); break;
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case 'x' : res = isxdigit(c); break;
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case 'z' : res = (c == 0); break; /* deprecated option */
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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 (int c, const char *p, const char *ec) {
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int sig = 1;
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if (*(p+1) == '^') {
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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 == L_ESC) {
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p++;
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if (match_class(c, uchar(*p)))
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return sig;
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}
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else if ((*(p+1) == '-') && (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 singlematch (int c, const char *p, const char *ep) {
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switch (*p) {
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case '.': return 1; /* matches any char */
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case L_ESC: return match_class(c, uchar(*(p+1)));
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case '[': return matchbracketclass(c, p, ep-1);
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default: return (uchar(*p) == c);
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}
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}
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static const char *match (MatchState *ms, const char *s, const char *p);
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static const char *matchbalance (MatchState *ms, const char *s,
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const char *p) {
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if (p >= ms->p_end - 1)
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luaL_error(ms->L, "malformed pattern "
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"(missing arguments to " LUA_QL("%%b") ")");
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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 char *max_expand (MatchState *ms, const char *s,
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const char *p, const char *ep) {
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ptrdiff_t i = 0; /* counts maximum expand for item */
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while ((s+i)<ms->src_end && 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 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 char *min_expand (MatchState *ms, const char *s,
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const char *p, const char *ep) {
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for (;;) {
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const 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 && 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 char *start_capture (MatchState *ms, const char *s,
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const char *p, int what) {
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const char *res;
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int level = ms->level;
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if (level >= LUA_MAXCAPTURES) luaL_error(ms->L, "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 char *end_capture (MatchState *ms, const char *s,
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const char *p) {
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int l = capture_to_close(ms);
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const 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 char *match_capture (MatchState *ms, const 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 char *match (MatchState *ms, const char *s, const char *p) {
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init: /* using goto's to optimize tail recursion */
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if (p == ms->p_end) /* end of pattern? */
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return s; /* match succeeded */
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switch (*p) {
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case '(': { /* start capture */
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if (*(p+1) == ')') /* 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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}
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case ')': { /* end capture */
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return end_capture(ms, s, p+1);
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}
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case '$': {
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if ((p+1) == ms->p_end) /* 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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}
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case L_ESC: { /* escaped sequences not in the format class[*+?-]? */
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switch (*(p+1)) {
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case '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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case 'f': { /* frontier? */
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const char *ep; char previous;
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p += 2;
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if (*p != '[')
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luaL_error(ms->L, "missing " LUA_QL("[") " after "
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LUA_QL("%%f") " in pattern");
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ep = classend(ms, p); /* points to what is next */
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previous = (s == ms->src_init) ? '\0' : *(s-1);
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if (matchbracketclass(uchar(previous), p, ep-1) ||
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!matchbracketclass(uchar(*s), p, ep-1)) return NULL;
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p=ep; goto init; /* else return match(ms, s, ep); */
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}
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case '0': case '1': case '2': case '3':
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case '4': case '5': case '6': case '7':
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case '8': case '9': { /* capture results (%0-%9)? */
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s = match_capture(ms, s, uchar(*(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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default: goto dflt;
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}
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}
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default: dflt: { /* pattern class plus optional suffix */
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const char *ep = classend(ms, p); /* points to what is next */
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int m = s < ms->src_end && singlematch(uchar(*s), p, ep);
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switch (*ep) {
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case '?': { /* optional */
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const 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 '*': { /* 0 or more repetitions */
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return max_expand(ms, s, p, ep);
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}
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case '+': { /* 1 or more repetitions */
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return (m ? max_expand(ms, s+1, p, ep) : NULL);
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}
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case '-': { /* 0 or more repetitions (minimum) */
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return min_expand(ms, s, p, ep);
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}
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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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}
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static const char *lmemfind (const char *s1, size_t l1,
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const 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 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 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, const char *s,
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const char *e) {
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if (i >= ms->level) {
|
|
if (i == 0) /* ms->level == 0, too */
|
|
lua_pushlstring(ms->L, s, e - s); /* add whole match */
|
|
else
|
|
luaL_error(ms->L, "invalid capture index");
|
|
}
|
|
else {
|
|
ptrdiff_t l = ms->capture[i].len;
|
|
if (l == CAP_UNFINISHED) luaL_error(ms->L, "unfinished capture");
|
|
if (l == CAP_POSITION)
|
|
lua_pushinteger(ms->L, ms->capture[i].init - ms->src_init + 1);
|
|
else
|
|
lua_pushlstring(ms->L, ms->capture[i].init, l);
|
|
}
|
|
}
|
|
|
|
|
|
static int push_captures (MatchState *ms, const char *s, const char *e) {
|
|
int i;
|
|
int nlevels = (ms->level == 0 && s) ? 1 : ms->level;
|
|
luaL_checkstack(ms->L, nlevels, "too many captures");
|
|
for (i = 0; i < nlevels; i++)
|
|
push_onecapture(ms, i, s, e);
|
|
return nlevels; /* number of strings pushed */
|
|
}
|
|
|
|
|
|
/* check whether pattern has no special characters */
|
|
static int nospecials (const char *p, size_t l) {
|
|
size_t upto = 0;
|
|
do {
|
|
if (strpbrk(p + upto, SPECIALS))
|
|
return 0; /* pattern has a special character */
|
|
upto += strlen(p + upto) + 1; /* may have more after \0 */
|
|
} while (upto <= l);
|
|
return 1; /* no special chars found */
|
|
}
|
|
|
|
|
|
static int str_find_aux (lua_State *L, int find) {
|
|
size_t ls, lp;
|
|
const char *s = luaL_checklstring(L, 1, &ls);
|
|
const char *p = luaL_checklstring(L, 2, &lp);
|
|
size_t init = posrelat(luaL_optinteger(L, 3, 1), ls);
|
|
if (init < 1) init = 1;
|
|
else if (init > ls + 1) { /* start after string's end? */
|
|
lua_pushnil(L); /* cannot find anything */
|
|
return 1;
|
|
}
|
|
/* explicit request or no special characters? */
|
|
if (find && (lua_toboolean(L, 4) || nospecials(p, lp))) {
|
|
/* do a plain search */
|
|
const char *s2 = lmemfind(s + init - 1, ls - init + 1, p, lp);
|
|
if (s2) {
|
|
lua_pushinteger(L, s2 - s + 1);
|
|
lua_pushinteger(L, s2 - s + lp);
|
|
return 2;
|
|
}
|
|
}
|
|
else {
|
|
MatchState ms;
|
|
const char *s1 = s + init - 1;
|
|
int anchor = (*p == '^');
|
|
if (anchor) {
|
|
p++; lp--; /* skip anchor character */
|
|
}
|
|
ms.L = L;
|
|
ms.src_init = s;
|
|
ms.src_end = s + ls;
|
|
ms.p_end = p + lp;
|
|
do {
|
|
const char *res;
|
|
ms.level = 0;
|
|
if ((res=match(&ms, s1, p)) != NULL) {
|
|
if (find) {
|
|
lua_pushinteger(L, s1 - s + 1); /* start */
|
|
lua_pushinteger(L, res - s); /* end */
|
|
return push_captures(&ms, NULL, 0) + 2;
|
|
}
|
|
else
|
|
return push_captures(&ms, s1, res);
|
|
}
|
|
} while (s1++ < ms.src_end && !anchor);
|
|
}
|
|
lua_pushnil(L); /* not found */
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int str_find (lua_State *L) {
|
|
return str_find_aux(L, 1);
|
|
}
|
|
|
|
|
|
static int str_match (lua_State *L) {
|
|
return str_find_aux(L, 0);
|
|
}
|
|
|
|
|
|
static int gmatch_aux (lua_State *L) {
|
|
MatchState ms;
|
|
size_t ls, lp;
|
|
const char *s = lua_tolstring(L, lua_upvalueindex(1), &ls);
|
|
const char *p = lua_tolstring(L, lua_upvalueindex(2), &lp);
|
|
const char *src;
|
|
ms.L = L;
|
|
ms.src_init = s;
|
|
ms.src_end = s+ls;
|
|
ms.p_end = p + lp;
|
|
for (src = s + (size_t)lua_tointeger(L, lua_upvalueindex(3));
|
|
src <= ms.src_end;
|
|
src++) {
|
|
const char *e;
|
|
ms.level = 0;
|
|
if ((e = match(&ms, src, p)) != NULL) {
|
|
lua_Integer newstart = e-s;
|
|
if (e == src) newstart++; /* empty match? go at least one position */
|
|
lua_pushinteger(L, newstart);
|
|
lua_replace(L, lua_upvalueindex(3));
|
|
return push_captures(&ms, src, e);
|
|
}
|
|
}
|
|
return 0; /* not found */
|
|
}
|
|
|
|
|
|
static int gmatch (lua_State *L) {
|
|
luaL_checkstring(L, 1);
|
|
luaL_checkstring(L, 2);
|
|
lua_settop(L, 2);
|
|
lua_pushinteger(L, 0);
|
|
lua_pushcclosure(L, gmatch_aux, 3);
|
|
return 1;
|
|
}
|
|
|
|
|
|
static void add_s (MatchState *ms, luaL_Buffer *b, const char *s,
|
|
const char *e) {
|
|
size_t l, i;
|
|
const char *news = lua_tolstring(ms->L, 3, &l);
|
|
for (i = 0; i < l; i++) {
|
|
if (news[i] != L_ESC)
|
|
luaL_addchar(b, news[i]);
|
|
else {
|
|
i++; /* skip ESC */
|
|
if (!isdigit(uchar(news[i]))) {
|
|
if (news[i] != L_ESC)
|
|
luaL_error(ms->L, "invalid use of " LUA_QL("%c")
|
|
" in replacement string", L_ESC);
|
|
luaL_addchar(b, news[i]);
|
|
}
|
|
else if (news[i] == '0')
|
|
luaL_addlstring(b, s, e - s);
|
|
else {
|
|
push_onecapture(ms, news[i] - '1', s, e);
|
|
luaL_addvalue(b); /* add capture to accumulated result */
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static void add_value (MatchState *ms, luaL_Buffer *b, const char *s,
|
|
const char *e, int tr) {
|
|
lua_State *L = ms->L;
|
|
switch (tr) {
|
|
case LUA_TFUNCTION: {
|
|
int n;
|
|
lua_pushvalue(L, 3);
|
|
n = push_captures(ms, s, e);
|
|
lua_call(L, n, 1);
|
|
break;
|
|
}
|
|
case LUA_TTABLE: {
|
|
push_onecapture(ms, 0, s, e);
|
|
lua_gettable(L, 3);
|
|
break;
|
|
}
|
|
default: { /* LUA_TNUMBER or LUA_TSTRING */
|
|
add_s(ms, b, s, e);
|
|
return;
|
|
}
|
|
}
|
|
if (!lua_toboolean(L, -1)) { /* nil or false? */
|
|
lua_pop(L, 1);
|
|
lua_pushlstring(L, s, e - s); /* keep original text */
|
|
}
|
|
else if (!lua_isstring(L, -1))
|
|
luaL_error(L, "invalid replacement value (a %s)", luaL_typename(L, -1));
|
|
luaL_addvalue(b); /* add result to accumulator */
|
|
}
|
|
|
|
|
|
static int str_gsub (lua_State *L) {
|
|
size_t srcl, lp;
|
|
const char *src = luaL_checklstring(L, 1, &srcl);
|
|
const char *p = luaL_checklstring(L, 2, &lp);
|
|
int tr = lua_type(L, 3);
|
|
size_t max_s = luaL_optinteger(L, 4, srcl+1);
|
|
int anchor = (*p == '^');
|
|
size_t n = 0;
|
|
MatchState ms;
|
|
luaL_Buffer b;
|
|
luaL_argcheck(L, tr == LUA_TNUMBER || tr == LUA_TSTRING ||
|
|
tr == LUA_TFUNCTION || tr == LUA_TTABLE, 3,
|
|
"string/function/table expected");
|
|
luaL_buffinit(L, &b);
|
|
if (anchor) {
|
|
p++; lp--; /* skip anchor character */
|
|
}
|
|
ms.L = L;
|
|
ms.src_init = src;
|
|
ms.src_end = src+srcl;
|
|
ms.p_end = p + lp;
|
|
while (n < max_s) {
|
|
const char *e;
|
|
ms.level = 0;
|
|
e = match(&ms, src, p);
|
|
if (e) {
|
|
n++;
|
|
add_value(&ms, &b, src, e, tr);
|
|
}
|
|
if (e && e>src) /* non empty match? */
|
|
src = e; /* skip it */
|
|
else if (src < ms.src_end)
|
|
luaL_addchar(&b, *src++);
|
|
else break;
|
|
if (anchor) break;
|
|
}
|
|
luaL_addlstring(&b, src, ms.src_end-src);
|
|
luaL_pushresult(&b);
|
|
lua_pushinteger(L, n); /* number of substitutions */
|
|
return 2;
|
|
}
|
|
|
|
/* }====================================================== */
|
|
|
|
|
|
|
|
/*
|
|
** {======================================================
|
|
** STRING FORMAT
|
|
** =======================================================
|
|
*/
|
|
|
|
/*
|
|
** LUA_INTFRMLEN is the length modifier for integer conversions in
|
|
** 'string.format'; LUA_INTFRM_T is the integer type corresponding to
|
|
** the previous length
|
|
*/
|
|
#if !defined(LUA_INTFRMLEN) /* { */
|
|
#if defined(LUA_USE_LONGLONG)
|
|
|
|
#define LUA_INTFRMLEN "ll"
|
|
#define LUA_INTFRM_T long long
|
|
|
|
#else
|
|
|
|
#define LUA_INTFRMLEN "l"
|
|
#define LUA_INTFRM_T long
|
|
|
|
#endif
|
|
#endif /* } */
|
|
|
|
#define MAX_UINTFRM ((lua_Number)(~(unsigned LUA_INTFRM_T)0))
|
|
#define MAX_INTFRM ((lua_Number)((~(unsigned LUA_INTFRM_T)0)/2))
|
|
#define MIN_INTFRM (-(lua_Number)((~(unsigned LUA_INTFRM_T)0)/2) - 1)
|
|
|
|
/*
|
|
** LUA_FLTFRMLEN is the length modifier for float conversions in
|
|
** 'string.format'; LUA_FLTFRM_T is the float type corresponding to
|
|
** the previous length
|
|
*/
|
|
#if !defined(LUA_FLTFRMLEN)
|
|
|
|
#define LUA_FLTFRMLEN ""
|
|
#define LUA_FLTFRM_T double
|
|
|
|
#endif
|
|
|
|
|
|
/* maximum size of each formatted item (> len(format('%99.99f', -1e308))) */
|
|
#define MAX_ITEM 512
|
|
/* valid flags in a format specification */
|
|
#define FLAGS "-+ #0"
|
|
/*
|
|
** maximum size of each format specification (such as '%-099.99d')
|
|
** (+10 accounts for %99.99x plus margin of error)
|
|
*/
|
|
#define MAX_FORMAT (sizeof(FLAGS) + sizeof(LUA_INTFRMLEN) + 10)
|
|
|
|
|
|
static void addquoted (lua_State *L, luaL_Buffer *b, int arg) {
|
|
size_t l;
|
|
const char *s = luaL_checklstring(L, arg, &l);
|
|
luaL_addchar(b, '"');
|
|
while (l--) {
|
|
if (*s == '"' || *s == '\\' || *s == '\n') {
|
|
luaL_addchar(b, '\\');
|
|
luaL_addchar(b, *s);
|
|
}
|
|
else if (*s == '\0' || iscntrl(uchar(*s))) {
|
|
char buff[10];
|
|
if (!isdigit(uchar(*(s+1))))
|
|
sprintf(buff, "\\%d", (int)uchar(*s));
|
|
else
|
|
sprintf(buff, "\\%03d", (int)uchar(*s));
|
|
luaL_addstring(b, buff);
|
|
}
|
|
else
|
|
luaL_addchar(b, *s);
|
|
s++;
|
|
}
|
|
luaL_addchar(b, '"');
|
|
}
|
|
|
|
static const char *scanformat (lua_State *L, const char *strfrmt, char *form) {
|
|
const char *p = strfrmt;
|
|
while (*p != '\0' && strchr(FLAGS, *p) != NULL) p++; /* skip flags */
|
|
if ((size_t)(p - strfrmt) >= sizeof(FLAGS)/sizeof(char))
|
|
luaL_error(L, "invalid format (repeated flags)");
|
|
if (isdigit(uchar(*p))) p++; /* skip width */
|
|
if (isdigit(uchar(*p))) p++; /* (2 digits at most) */
|
|
if (*p == '.') {
|
|
p++;
|
|
if (isdigit(uchar(*p))) p++; /* skip precision */
|
|
if (isdigit(uchar(*p))) p++; /* (2 digits at most) */
|
|
}
|
|
if (isdigit(uchar(*p)))
|
|
luaL_error(L, "invalid format (width or precision too long)");
|
|
*(form++) = '%';
|
|
memcpy(form, strfrmt, (p - strfrmt + 1) * sizeof(char));
|
|
form += p - strfrmt + 1;
|
|
*form = '\0';
|
|
return p;
|
|
}
|
|
|
|
|
|
/*
|
|
** add length modifier into formats
|
|
*/
|
|
static void addlenmod (char *form, const char *lenmod) {
|
|
size_t l = strlen(form);
|
|
size_t lm = strlen(lenmod);
|
|
char spec = form[l - 1];
|
|
strcpy(form + l - 1, lenmod);
|
|
form[l + lm - 1] = spec;
|
|
form[l + lm] = '\0';
|
|
}
|
|
|
|
|
|
static int str_format (lua_State *L) {
|
|
int top = lua_gettop(L);
|
|
int arg = 1;
|
|
size_t sfl;
|
|
const char *strfrmt = luaL_checklstring(L, arg, &sfl);
|
|
const char *strfrmt_end = strfrmt+sfl;
|
|
luaL_Buffer b;
|
|
luaL_buffinit(L, &b);
|
|
while (strfrmt < strfrmt_end) {
|
|
if (*strfrmt != L_ESC)
|
|
luaL_addchar(&b, *strfrmt++);
|
|
else if (*++strfrmt == L_ESC)
|
|
luaL_addchar(&b, *strfrmt++); /* %% */
|
|
else { /* format item */
|
|
char form[MAX_FORMAT]; /* to store the format (`%...') */
|
|
char *buff = luaL_prepbuffsize(&b, MAX_ITEM); /* to put formatted item */
|
|
int nb = 0; /* number of bytes in added item */
|
|
if (++arg > top)
|
|
luaL_argerror(L, arg, "no value");
|
|
strfrmt = scanformat(L, strfrmt, form);
|
|
switch (*strfrmt++) {
|
|
case 'c': {
|
|
nb = sprintf(buff, form, luaL_checkint(L, arg));
|
|
break;
|
|
}
|
|
case 'd': case 'i': {
|
|
lua_Number n = luaL_checknumber(L, arg);
|
|
luaL_argcheck(L, (MIN_INTFRM - 1) < n && n < (MAX_INTFRM + 1), arg,
|
|
"not a number in proper range");
|
|
addlenmod(form, LUA_INTFRMLEN);
|
|
nb = sprintf(buff, form, (LUA_INTFRM_T)n);
|
|
break;
|
|
}
|
|
case 'o': case 'u': case 'x': case 'X': {
|
|
lua_Number n = luaL_checknumber(L, arg);
|
|
luaL_argcheck(L, 0 <= n && n < (MAX_UINTFRM + 1), arg,
|
|
"not a non-negative number in proper range");
|
|
addlenmod(form, LUA_INTFRMLEN);
|
|
nb = sprintf(buff, form, (unsigned LUA_INTFRM_T)n);
|
|
break;
|
|
}
|
|
case 'e': case 'E': case 'f':
|
|
#if defined(LUA_USE_AFORMAT)
|
|
case 'a': case 'A':
|
|
#endif
|
|
case 'g': case 'G': {
|
|
addlenmod(form, LUA_FLTFRMLEN);
|
|
nb = sprintf(buff, form, (LUA_FLTFRM_T)luaL_checknumber(L, arg));
|
|
break;
|
|
}
|
|
case 'q': {
|
|
addquoted(L, &b, arg);
|
|
break;
|
|
}
|
|
case 's': {
|
|
size_t l;
|
|
const char *s = luaL_tolstring(L, arg, &l);
|
|
if (!strchr(form, '.') && l >= 100) {
|
|
/* no precision and string is too long to be formatted;
|
|
keep original string */
|
|
luaL_addvalue(&b);
|
|
break;
|
|
}
|
|
else {
|
|
nb = sprintf(buff, form, s);
|
|
lua_pop(L, 1); /* remove result from 'luaL_tolstring' */
|
|
break;
|
|
}
|
|
}
|
|
default: { /* also treat cases `pnLlh' */
|
|
return luaL_error(L, "invalid option " LUA_QL("%%%c") " to "
|
|
LUA_QL("format"), *(strfrmt - 1));
|
|
}
|
|
}
|
|
luaL_addsize(&b, nb);
|
|
}
|
|
}
|
|
luaL_pushresult(&b);
|
|
return 1;
|
|
}
|
|
|
|
/* }====================================================== */
|
|
|
|
|
|
static const luaL_Reg strlib[] = {
|
|
{"byte", str_byte},
|
|
{"char", str_char},
|
|
{"dump", str_dump},
|
|
{"find", str_find},
|
|
{"format", str_format},
|
|
{"gmatch", gmatch},
|
|
{"gsub", str_gsub},
|
|
{"len", str_len},
|
|
{"lower", str_lower},
|
|
{"match", str_match},
|
|
{"rep", str_rep},
|
|
{"reverse", str_reverse},
|
|
{"sub", str_sub},
|
|
{"upper", str_upper},
|
|
{NULL, NULL}
|
|
};
|
|
|
|
|
|
static void createmetatable (lua_State *L) {
|
|
lua_createtable(L, 0, 1); /* table to be metatable for strings */
|
|
lua_pushliteral(L, ""); /* dummy string */
|
|
lua_pushvalue(L, -2); /* copy table */
|
|
lua_setmetatable(L, -2); /* set table as metatable for strings */
|
|
lua_pop(L, 1); /* pop dummy string */
|
|
lua_pushvalue(L, -2); /* get string library */
|
|
lua_setfield(L, -2, "__index"); /* metatable.__index = string */
|
|
lua_pop(L, 1); /* pop metatable */
|
|
}
|
|
|
|
|
|
/*
|
|
** Open string library
|
|
*/
|
|
LUAMOD_API int luaopen_string (lua_State *L) {
|
|
luaL_newlib(L, strlib);
|
|
createmetatable(L);
|
|
return 1;
|
|
}
|
|
|