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Standard library for strings and pattern-matching

This commit is contained in:
Roberto Ierusalimschy 1997-09-16 16:25:59 -03:00
parent 9f3785a2f3
commit 75ac0d2172
2 changed files with 134 additions and 154 deletions
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273
strlib.c → lstrlib.c
View File

@ -1,17 +1,17 @@
/* /*
** strlib.c ** $Id: lstrlib.c,v 1.1 1997/08/14 19:47:57 roberto Exp roberto $
** String library to LUA ** Standard library for strings and pattern-matching
** See Copyright Notice in lua.h
*/ */
char *rcs_strlib="$Id: strlib.c,v 1.46 1997/06/19 18:49:40 roberto Exp roberto $";
#include <string.h> #include <ctype.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <ctype.h> #include <string.h>
#include "lauxlib.h"
#include "lua.h" #include "lua.h"
#include "auxlib.h"
#include "lualib.h" #include "lualib.h"
@ -37,12 +37,14 @@ static char *strbuffer (unsigned long size)
return lbuffer.b; return lbuffer.b;
} }
static char *openspace (unsigned long size) static char *openspace (unsigned long size)
{ {
char *buff = strbuffer(lbuffer.size+size); char *buff = strbuffer(lbuffer.size+size);
return buff+lbuffer.size; return buff+lbuffer.size;
} }
char *luaI_addchar (int c) char *luaI_addchar (int c)
{ {
if (lbuffer.size >= lbuffer.max) if (lbuffer.size >= lbuffer.max)
@ -51,6 +53,7 @@ char *luaI_addchar (int c)
return lbuffer.b; return lbuffer.b;
} }
void luaI_emptybuff (void) void luaI_emptybuff (void)
{ {
lbuffer.size = 0; /* prepare for next string */ lbuffer.size = 0; /* prepare for next string */
@ -64,23 +67,19 @@ static void addnchar (char *s, int n)
lbuffer.size += n; lbuffer.size += n;
} }
static void addstr (char *s) static void addstr (char *s)
{ {
addnchar(s, strlen(s)); addnchar(s, strlen(s));
} }
/*
** Return the string length
*/
static void str_len (void) static void str_len (void)
{ {
lua_pushnumber(strlen(luaL_check_string(1))); lua_pushnumber(strlen(luaL_check_string(1)));
} }
/*
** Return the substring of a string
*/
static void str_sub (void) static void str_sub (void)
{ {
char *s = luaL_check_string(1); char *s = luaL_check_string(1);
@ -97,9 +96,7 @@ static void str_sub (void)
else lua_pushstring(""); else lua_pushstring("");
} }
/*
** Convert a string to lower case.
*/
static void str_lower (void) static void str_lower (void)
{ {
char *s; char *s;
@ -109,9 +106,7 @@ static void str_lower (void)
lua_pushstring(luaI_addchar(0)); lua_pushstring(luaI_addchar(0));
} }
/*
** Convert a string to upper case.
*/
static void str_upper (void) static void str_upper (void)
{ {
char *s; char *s;
@ -131,9 +126,7 @@ static void str_rep (void)
lua_pushstring(luaI_addchar(0)); lua_pushstring(luaI_addchar(0));
} }
/*
** get ascii value of a character in a string
*/
static void str_ascii (void) static void str_ascii (void)
{ {
char *s = luaL_check_string(1); char *s = luaL_check_string(1);
@ -143,74 +136,12 @@ static void str_ascii (void)
} }
/* pattern matching */
#define ESC '%' /*
#define SPECIALS "^$*?.([%-" ** =======================================================
** PATTERN MATCHING
static char *bracket_end (char *p) ** =======================================================
{ */
return (*p == 0) ? NULL : strchr((*p=='^') ? p+2 : p+1, ']');
}
char *luaL_item_end (char *p)
{
switch (*p++) {
case '\0': return p-1;
case ESC:
if (*p == 0) luaL_verror("incorrect pattern (ends with `%c')", ESC);
return p+1;
case '[': {
char *end = bracket_end(p);
if (end == NULL) lua_error("incorrect pattern (missing `]')");
return end+1;
}
default:
return p;
}
}
static int matchclass (int c, int cl)
{
int res;
switch (tolower((unsigned char)cl)) {
case 'a' : res = isalpha((unsigned char)c); break;
case 'c' : res = iscntrl((unsigned char)c); break;
case 'd' : res = isdigit((unsigned char)c); break;
case 'l' : res = islower((unsigned char)c); break;
case 'p' : res = ispunct((unsigned char)c); break;
case 's' : res = isspace((unsigned char)c); break;
case 'u' : res = isupper((unsigned char)c); break;
case 'w' : res = isalnum((unsigned char)c); break;
default: return (cl == c);
}
return (islower((unsigned char)cl) ? res : !res);
}
int luaL_singlematch (int c, char *p)
{
if (c == 0) return 0;
switch (*p) {
case '.': return 1;
case ESC: return matchclass(c, *(p+1));
case '[': {
char *end = bracket_end(p+1);
int sig = *(p+1) == '^' ? (p++, 0) : 1;
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: return (*p == c);
}
}
#define MAX_CAPT 9 #define MAX_CAPT 9
@ -222,6 +153,10 @@ static struct {
static int num_captures; /* only valid after a sucessful call to match */ static int num_captures; /* only valid after a sucessful call to match */
#define ESC '%'
#define SPECIALS "^$*?.([%-"
static void push_captures (void) static void push_captures (void)
{ {
int i; int i;
@ -235,6 +170,7 @@ static void push_captures (void)
} }
} }
static int check_cap (int l, int level) static int check_cap (int l, int level)
{ {
l -= '1'; l -= '1';
@ -243,6 +179,7 @@ static int check_cap (int l, int level)
return l; return l;
} }
static int capture_to_close (int level) static int capture_to_close (int level)
{ {
for (level--; level>=0; level--) for (level--; level>=0; level--)
@ -251,6 +188,71 @@ static int capture_to_close (int level)
return 0; /* to avoid warnings */ 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 'a' : res = isalpha((unsigned char)c); break;
case 'c' : res = iscntrl((unsigned char)c); break;
case 'd' : res = isdigit((unsigned char)c); break;
case 'l' : res = islower((unsigned char)c); break;
case 'p' : res = ispunct((unsigned char)c); break;
case 's' : res = isspace((unsigned char)c); break;
case 'u' : res = isupper((unsigned char)c); break;
case 'w' : res = isalnum((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 '\0':
*ep = p;
return 0;
case '.':
*ep = p+1;
return (c != 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) static char *matchbalance (char *s, int b, int e)
{ {
if (*s != b) return NULL; if (*s != b) return NULL;
@ -266,6 +268,31 @@ static char *matchbalance (char *s, int b, int e)
return NULL; /* string ends out of balance */ return NULL; /* string ends out of balance */
} }
static char *matchitem (char *s, char *p, int level, char **ep)
{
if (*p == ESC) {
p++;
if (isdigit((unsigned char)*p)) { /* capture */
int l = check_cap(*p, level);
*ep = p+1;
if (strncmp(capture[l].init, s, capture[l].len) == 0)
return s+capture[l].len;
else return NULL;
}
else if (*p == 'b') { /* balanced string */
p++;
if (*p == 0 || *(p+1) == 0)
lua_error("bad balanced pattern specification");
*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, int level) static char *match (char *s, char *p, int level)
{ {
init: /* using goto's to optimize tail recursion */ init: /* using goto's to optimize tail recursion */
@ -283,38 +310,19 @@ static char *match (char *s, char *p, int level)
capture[l].len = -1; /* undo capture */ capture[l].len = -1; /* undo capture */
return res; return res;
} }
case ESC:
if (isdigit((unsigned char)(*(p+1)))) { /* capture */
int l = check_cap(*(p+1), level);
if (strncmp(capture[l].init, s, capture[l].len) == 0) {
/* return match(p+2, s+capture[l].len, level); */
p+=2; s+=capture[l].len; goto init;
}
else return NULL;
}
else if (*(p+1) == 'b') { /* balanced string */
if (*(p+2) == 0 || *(p+3) == 0)
lua_error("bad balanced pattern specification");
s = matchbalance(s, *(p+2), *(p+3));
if (s == NULL) return NULL;
else { /* return match(p+4, s, level); */
p+=4; goto init;
}
}
else goto dflt;
case '\0': case '$': /* (possibly) end of pattern */ case '\0': case '$': /* (possibly) end of pattern */
if (*p == 0 || (*(p+1) == 0 && *s == 0)) { if (*p == 0 || (*(p+1) == 0 && *s == 0)) {
num_captures = level; num_captures = level;
return s; return s;
} }
else goto dflt; /* else go through */
default: dflt: { /* it is a pattern item */ default: { /* it is a pattern item */
int m = luaL_singlematch(*s, p); char *ep; /* get what is next */
char *ep = luaL_item_end(p); /* get what is next */ char *s1 = matchitem(s, p, level, &ep);
switch (*ep) { switch (*ep) {
case '*': { /* repetition */ case '*': { /* repetition */
char *res; char *res;
if (m && (res = match(s+1, p, level))) if (s1 && (res = match(s1, p, level)))
return res; return res;
p=ep+1; goto init; /* else return match(s, ep+1, level); */ p=ep+1; goto init; /* else return match(s, ep+1, level); */
} }
@ -322,27 +330,28 @@ static char *match (char *s, char *p, int level)
char *res; char *res;
if ((res = match(s, ep+1, level)) != 0) if ((res = match(s, ep+1, level)) != 0)
return res; return res;
else if (m) { else if (s1) {
s++; s = s1;
goto init; /* return match(s+1, p, level); */ goto init; /* return match(s1, p, level); */
} }
else else
return NULL; return NULL;
} }
case '?': { /* optional */ case '?': { /* optional */
char *res; char *res;
if (m && (res = match(s+1, ep+1, level))) if (s1 && (res = match(s1, ep+1, level)))
return res; return res;
p=ep+1; goto init; /* else return match(s, ep+1, level); */ p=ep+1; goto init; /* else return match(s, ep+1, level); */
} }
default: default:
if (m) { s++; p=ep; goto init; } /* return match(s+1, ep, level); */ if (s1) { s=s1; p=ep; goto init; } /* return match(s1, ep, level); */
else return NULL; else return NULL;
} }
} }
} }
} }
static void str_find (void) static void str_find (void)
{ {
char *s = luaL_check_string(1); char *s = luaL_check_string(1);
@ -372,7 +381,8 @@ static void str_find (void)
} }
} }
static void add_s (lua_Object newp, lua_Object table, int n)
static void add_s (lua_Object newp)
{ {
if (lua_isstring(newp)) { if (lua_isstring(newp)) {
char *news = lua_getstring(newp); char *news = lua_getstring(newp);
@ -390,12 +400,8 @@ static void add_s (lua_Object newp, lua_Object table, int n)
struct lbuff oldbuff; struct lbuff oldbuff;
int status; int status;
lua_beginblock(); lua_beginblock();
if (lua_istable(table)) {
lua_pushobject(table);
lua_pushnumber(n);
}
push_captures(); push_captures();
/* function may use lbuffer, so save it and create a new one */ /* function may use lbuffer, so save it and create a luaM_new one */
oldbuff = lbuffer; oldbuff = lbuffer;
lbuffer.b = NULL; lbuffer.max = lbuffer.size = 0; lbuffer.b = NULL; lbuffer.max = lbuffer.size = 0;
status = lua_callfunction(newp); status = lua_callfunction(newp);
@ -411,13 +417,13 @@ static void add_s (lua_Object newp, lua_Object table, int n)
else luaL_arg_check(0, 3, NULL); else luaL_arg_check(0, 3, NULL);
} }
static void str_gsub (void) static void str_gsub (void)
{ {
char *src = luaL_check_string(1); char *src = luaL_check_string(1);
char *p = luaL_check_string(2); char *p = luaL_check_string(2);
lua_Object newp = lua_getparam(3); lua_Object newp = lua_getparam(3);
lua_Object table = lua_getparam(4); int max_s = (int)luaL_opt_number(4, strlen(src)+1);
int max_s = (int)luaL_opt_number(lua_istable(table)?5:4, strlen(src)+1);
int anchor = (*p == '^') ? (p++, 1) : 0; int anchor = (*p == '^') ? (p++, 1) : 0;
int n = 0; int n = 0;
luaI_emptybuff(); luaI_emptybuff();
@ -425,7 +431,7 @@ static void str_gsub (void)
char *e = match(src, p, 0); char *e = match(src, p, 0);
if (e) { if (e) {
n++; n++;
add_s(newp, table, n); add_s(newp);
} }
if (e && e>src) /* non empty match? */ if (e && e>src) /* non empty match? */
src = e; /* skip it */ src = e; /* skip it */
@ -439,18 +445,6 @@ static void str_gsub (void)
lua_pushnumber(n); /* number of substitutions */ lua_pushnumber(n); /* number of substitutions */
} }
static void str_set (void)
{
char *item = luaL_check_string(1);
int i;
luaL_arg_check(*luaL_item_end(item) == 0, 1, "wrong format");
luaI_emptybuff();
for (i=1; i<256; i++) /* 0 cannot be part of a set */
if (luaL_singlematch(i, item))
luaI_addchar(i);
lua_pushstring(luaI_addchar(0));
}
void luaI_addquoted (char *s) void luaI_addquoted (char *s)
{ {
@ -505,7 +499,7 @@ static void str_format (void)
case 'u': case 'x': case 'X': case 'u': case 'x': case 'X':
sprintf(buff, form, (int)luaL_check_number(arg)); sprintf(buff, form, (int)luaL_check_number(arg));
break; break;
case 'e': case 'E': case 'f': case 'g': case 'e': case 'E': case 'f': case 'g': case 'G':
sprintf(buff, form, luaL_check_number(arg)); sprintf(buff, form, luaL_check_number(arg));
break; break;
default: /* also treat cases 'pnLlh' */ default: /* also treat cases 'pnLlh' */
@ -521,7 +515,6 @@ static void str_format (void)
static struct luaL_reg strlib[] = { static struct luaL_reg strlib[] = {
{"strlen", str_len}, {"strlen", str_len},
{"strsub", str_sub}, {"strsub", str_sub},
{"strset", str_set},
{"strlower", str_lower}, {"strlower", str_lower},
{"strupper", str_upper}, {"strupper", str_upper},
{"strrep", str_rep}, {"strrep", str_rep},

13
strlib.h
View File

@ -1,13 +0,0 @@
/*
** String library to LUA
** TeCGraf - PUC-Rio
** $Id: $
*/
#ifndef strlib_h
void strlib_open (void);
#endif