commit 75ac0d217266dba48a887df96d37398140e22b9e
parent 9f3785a2f375989fbac59f82efe38768919cc334
Author: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Tue, 16 Sep 1997 16:25:38 -0300
Standard library for strings and pattern-matching
Diffstat:
| A | lstrlib.c | | | 534 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| D | strlib.c | | | 541 | ------------------------------------------------------------------------------- |
| D | strlib.h | | | 13 | ------------- |
3 files changed, 534 insertions(+), 554 deletions(-)
diff --git a/lstrlib.c b/lstrlib.c
@@ -0,0 +1,534 @@
+/*
+** $Id: lstrlib.c,v 1.1 1997/08/14 19:47:57 roberto Exp roberto $
+** Standard library for strings and pattern-matching
+** See Copyright Notice in lua.h
+*/
+
+
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "lauxlib.h"
+#include "lua.h"
+#include "lualib.h"
+
+
+struct lbuff {
+ char *b;
+ size_t max;
+ size_t size;
+};
+
+static struct lbuff lbuffer = {NULL, 0, 0};
+
+
+static char *strbuffer (unsigned long size)
+{
+ if (size > lbuffer.max) {
+ /* ANSI "realloc" doesn't need this test, but some machines (Sun!)
+ don't follow ANSI */
+ lbuffer.b = (lbuffer.b) ? realloc(lbuffer.b, lbuffer.max=size) :
+ malloc(lbuffer.max=size);
+ if (lbuffer.b == NULL)
+ lua_error("memory overflow");
+ }
+ return lbuffer.b;
+}
+
+
+static char *openspace (unsigned long size)
+{
+ char *buff = strbuffer(lbuffer.size+size);
+ return buff+lbuffer.size;
+}
+
+
+char *luaI_addchar (int c)
+{
+ if (lbuffer.size >= lbuffer.max)
+ strbuffer(lbuffer.max == 0 ? 100 : lbuffer.max*2);
+ lbuffer.b[lbuffer.size++] = c;
+ return lbuffer.b;
+}
+
+
+void luaI_emptybuff (void)
+{
+ lbuffer.size = 0; /* prepare for next string */
+}
+
+
+static void addnchar (char *s, int n)
+{
+ char *b = openspace(n);
+ strncpy(b, s, n);
+ lbuffer.size += n;
+}
+
+
+static void addstr (char *s)
+{
+ addnchar(s, strlen(s));
+}
+
+
+static void str_len (void)
+{
+ lua_pushnumber(strlen(luaL_check_string(1)));
+}
+
+
+static void str_sub (void)
+{
+ char *s = luaL_check_string(1);
+ long l = strlen(s);
+ long start = (long)luaL_check_number(2);
+ long end = (long)luaL_opt_number(3, -1);
+ if (start < 0) start = l+start+1;
+ if (end < 0) end = l+end+1;
+ if (1 <= start && start <= end && end <= l) {
+ luaI_emptybuff();
+ addnchar(s+start-1, end-start+1);
+ lua_pushstring(luaI_addchar(0));
+ }
+ else lua_pushstring("");
+}
+
+
+static void str_lower (void)
+{
+ char *s;
+ luaI_emptybuff();
+ for (s = luaL_check_string(1); *s; s++)
+ luaI_addchar(tolower((unsigned char)*s));
+ lua_pushstring(luaI_addchar(0));
+}
+
+
+static void str_upper (void)
+{
+ char *s;
+ luaI_emptybuff();
+ for (s = luaL_check_string(1); *s; s++)
+ luaI_addchar(toupper((unsigned char)*s));
+ lua_pushstring(luaI_addchar(0));
+}
+
+static void str_rep (void)
+{
+ char *s = luaL_check_string(1);
+ int n = (int)luaL_check_number(2);
+ luaI_emptybuff();
+ while (n-- > 0)
+ addstr(s);
+ lua_pushstring(luaI_addchar(0));
+}
+
+
+static void str_ascii (void)
+{
+ char *s = luaL_check_string(1);
+ long pos = (long)luaL_opt_number(2, 1) - 1;
+ luaL_arg_check(0<=pos && pos<strlen(s), 2, "out of range");
+ lua_pushnumber((unsigned char)s[pos]);
+}
+
+
+
+/*
+** =======================================================
+** PATTERN MATCHING
+** =======================================================
+*/
+
+#define MAX_CAPT 9
+
+static struct {
+ char *init;
+ int len; /* -1 signals unfinished capture */
+} capture[MAX_CAPT];
+
+static int num_captures; /* only valid after a sucessful call to match */
+
+
+#define ESC '%'
+#define SPECIALS "^$*?.([%-"
+
+
+static void push_captures (void)
+{
+ int i;
+ for (i=0; i<num_captures; i++) {
+ int l = capture[i].len;
+ char *buff = openspace(l+1);
+ if (l == -1) lua_error("unfinished capture");
+ strncpy(buff, capture[i].init, l);
+ buff[l] = 0;
+ lua_pushstring(buff);
+ }
+}
+
+
+static int check_cap (int l, int level)
+{
+ l -= '1';
+ if (!(0 <= l && l < level && capture[l].len != -1))
+ lua_error("invalid capture index");
+ return l;
+}
+
+
+static int capture_to_close (int level)
+{
+ for (level--; level>=0; level--)
+ if (capture[level].len == -1) return level;
+ lua_error("invalid pattern capture");
+ return 0; /* to avoid warnings */
+}
+
+
+static char *bracket_end (char *p)
+{
+ return (*p == 0) ? NULL : strchr((*p=='^') ? p+2 : p+1, ']');
+}
+
+
+static int matchclass (int c, int cl)
+{
+ int res;
+ if (c == 0) return 0;
+ switch (tolower((unsigned char)cl)) {
+ case '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)
+{
+ if (*s != b) return NULL;
+ else {
+ int cont = 1;
+ while (*(++s)) {
+ if (*s == e) {
+ if (--cont == 0) return s+1;
+ }
+ else if (*s == b) cont++;
+ }
+ }
+ return NULL; /* string ends out of balance */
+}
+
+
+static char *matchitem (char *s, char *p, 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)
+{
+ init: /* using goto's to optimize tail recursion */
+ switch (*p) {
+ case '(': /* start capture */
+ if (level >= MAX_CAPT) lua_error("too many captures");
+ capture[level].init = s;
+ capture[level].len = -1;
+ level++; p++; goto init; /* return match(s, p+1, level); */
+ case ')': { /* end capture */
+ int l = capture_to_close(level);
+ char *res;
+ capture[l].len = s - capture[l].init; /* close capture */
+ if ((res = match(s, p+1, level)) == NULL) /* match failed? */
+ capture[l].len = -1; /* undo capture */
+ return res;
+ }
+ case '\0': case '$': /* (possibly) end of pattern */
+ if (*p == 0 || (*(p+1) == 0 && *s == 0)) {
+ num_captures = level;
+ return s;
+ }
+ /* else go through */
+ default: { /* it is a pattern item */
+ char *ep; /* get what is next */
+ char *s1 = matchitem(s, p, level, &ep);
+ switch (*ep) {
+ case '*': { /* repetition */
+ char *res;
+ if (s1 && (res = match(s1, p, level)))
+ return res;
+ p=ep+1; goto init; /* else return match(s, ep+1, level); */
+ }
+ case '-': { /* repetition */
+ char *res;
+ if ((res = match(s, ep+1, level)) != 0)
+ return res;
+ else if (s1) {
+ s = s1;
+ goto init; /* return match(s1, p, level); */
+ }
+ else
+ return NULL;
+ }
+ case '?': { /* optional */
+ char *res;
+ if (s1 && (res = match(s1, ep+1, level)))
+ return res;
+ p=ep+1; goto init; /* else return match(s, ep+1, level); */
+ }
+ default:
+ if (s1) { s=s1; p=ep; goto init; } /* return match(s1, ep, level); */
+ else return NULL;
+ }
+ }
+ }
+}
+
+
+static void str_find (void)
+{
+ char *s = luaL_check_string(1);
+ char *p = luaL_check_string(2);
+ long init = (long)luaL_opt_number(3, 1) - 1;
+ luaL_arg_check(0 <= init && init <= strlen(s), 3, "out of range");
+ if (lua_getparam(4) != LUA_NOOBJECT ||
+ strpbrk(p, SPECIALS) == NULL) { /* no special caracters? */
+ char *s2 = strstr(s+init, p);
+ if (s2) {
+ lua_pushnumber(s2-s+1);
+ lua_pushnumber(s2-s+strlen(p));
+ }
+ }
+ else {
+ int anchor = (*p == '^') ? (p++, 1) : 0;
+ char *s1=s+init;
+ do {
+ char *res;
+ if ((res=match(s1, p, 0)) != NULL) {
+ lua_pushnumber(s1-s+1); /* start */
+ lua_pushnumber(res-s); /* end */
+ push_captures();
+ return;
+ }
+ } while (*s1++ && !anchor);
+ }
+}
+
+
+static void add_s (lua_Object newp)
+{
+ if (lua_isstring(newp)) {
+ char *news = lua_getstring(newp);
+ while (*news) {
+ if (*news != ESC || !isdigit((unsigned char)*++news))
+ luaI_addchar(*news++);
+ else {
+ int l = check_cap(*news++, num_captures);
+ addnchar(capture[l].init, capture[l].len);
+ }
+ }
+ }
+ else if (lua_isfunction(newp)) {
+ lua_Object res;
+ struct lbuff oldbuff;
+ int status;
+ lua_beginblock();
+ push_captures();
+ /* function may use lbuffer, so save it and create a luaM_new one */
+ oldbuff = lbuffer;
+ lbuffer.b = NULL; lbuffer.max = lbuffer.size = 0;
+ status = lua_callfunction(newp);
+ /* restore old buffer */
+ free(lbuffer.b);
+ lbuffer = oldbuff;
+ if (status != 0)
+ lua_error(NULL);
+ res = lua_getresult(1);
+ addstr(lua_isstring(res) ? lua_getstring(res) : "");
+ lua_endblock();
+ }
+ else luaL_arg_check(0, 3, NULL);
+}
+
+
+static void str_gsub (void)
+{
+ char *src = luaL_check_string(1);
+ char *p = luaL_check_string(2);
+ lua_Object newp = lua_getparam(3);
+ int max_s = (int)luaL_opt_number(4, strlen(src)+1);
+ int anchor = (*p == '^') ? (p++, 1) : 0;
+ int n = 0;
+ luaI_emptybuff();
+ while (n < max_s) {
+ char *e = match(src, p, 0);
+ if (e) {
+ n++;
+ add_s(newp);
+ }
+ if (e && e>src) /* non empty match? */
+ src = e; /* skip it */
+ else if (*src)
+ luaI_addchar(*src++);
+ else break;
+ if (anchor) break;
+ }
+ addstr(src);
+ lua_pushstring(luaI_addchar(0));
+ lua_pushnumber(n); /* number of substitutions */
+}
+
+
+void luaI_addquoted (char *s)
+{
+ luaI_addchar('"');
+ for (; *s; s++) {
+ if (strchr("\"\\\n", *s))
+ luaI_addchar('\\');
+ luaI_addchar(*s);
+ }
+ luaI_addchar('"');
+}
+
+#define MAX_FORMAT 200
+
+static void str_format (void)
+{
+ int arg = 1;
+ char *strfrmt = luaL_check_string(arg);
+ luaI_emptybuff(); /* initialize */
+ while (*strfrmt) {
+ if (*strfrmt != '%')
+ luaI_addchar(*strfrmt++);
+ else if (*++strfrmt == '%')
+ luaI_addchar(*strfrmt++); /* %% */
+ else { /* format item */
+ char form[MAX_FORMAT]; /* store the format ('%...') */
+ char *buff;
+ char *initf = strfrmt;
+ form[0] = '%';
+ strfrmt = match(strfrmt, "%d?%$?[-+ #]*(%d*)%.?(%d*)", 0);
+ if (capture[0].len > 3 || capture[1].len > 3) /* < 1000? */
+ lua_error("invalid format (width or precision too long)");
+ if (isdigit((unsigned char)initf[0]) && initf[1] == '$') {
+ arg = initf[0] - '0';
+ initf += 2; /* skip the 'n$' */
+ }
+ arg++;
+ strncpy(form+1, initf, strfrmt-initf+1); /* +1 to include convertion */
+ form[strfrmt-initf+2] = 0;
+ buff = openspace(1000); /* to store the formated value */
+ switch (*strfrmt++) {
+ case 'q':
+ luaI_addquoted(luaL_check_string(arg));
+ continue;
+ case 's': {
+ char *s = luaL_check_string(arg);
+ buff = openspace(strlen(s));
+ sprintf(buff, form, s);
+ break;
+ }
+ case 'c': case 'd': case 'i': case 'o':
+ case 'u': case 'x': case 'X':
+ sprintf(buff, form, (int)luaL_check_number(arg));
+ break;
+ case 'e': case 'E': case 'f': case 'g': case 'G':
+ sprintf(buff, form, luaL_check_number(arg));
+ break;
+ default: /* also treat cases 'pnLlh' */
+ lua_error("invalid format option in function `format'");
+ }
+ lbuffer.size += strlen(buff);
+ }
+ }
+ lua_pushstring(luaI_addchar(0)); /* push the result */
+}
+
+
+static struct luaL_reg strlib[] = {
+{"strlen", str_len},
+{"strsub", str_sub},
+{"strlower", str_lower},
+{"strupper", str_upper},
+{"strrep", str_rep},
+{"ascii", str_ascii},
+{"format", str_format},
+{"strfind", str_find},
+{"gsub", str_gsub}
+};
+
+
+/*
+** Open string library
+*/
+void strlib_open (void)
+{
+ luaL_openlib(strlib, (sizeof(strlib)/sizeof(strlib[0])));
+}
diff --git a/strlib.c b/strlib.c
@@ -1,541 +0,0 @@
-/*
-** strlib.c
-** String library to LUA
-*/
-
-char *rcs_strlib="$Id: strlib.c,v 1.46 1997/06/19 18:49:40 roberto Exp roberto $";
-
-#include <string.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <ctype.h>
-
-#include "lua.h"
-#include "auxlib.h"
-#include "lualib.h"
-
-
-struct lbuff {
- char *b;
- size_t max;
- size_t size;
-};
-
-static struct lbuff lbuffer = {NULL, 0, 0};
-
-
-static char *strbuffer (unsigned long size)
-{
- if (size > lbuffer.max) {
- /* ANSI "realloc" doesn't need this test, but some machines (Sun!)
- don't follow ANSI */
- lbuffer.b = (lbuffer.b) ? realloc(lbuffer.b, lbuffer.max=size) :
- malloc(lbuffer.max=size);
- if (lbuffer.b == NULL)
- lua_error("memory overflow");
- }
- return lbuffer.b;
-}
-
-static char *openspace (unsigned long size)
-{
- char *buff = strbuffer(lbuffer.size+size);
- return buff+lbuffer.size;
-}
-
-char *luaI_addchar (int c)
-{
- if (lbuffer.size >= lbuffer.max)
- strbuffer(lbuffer.max == 0 ? 100 : lbuffer.max*2);
- lbuffer.b[lbuffer.size++] = c;
- return lbuffer.b;
-}
-
-void luaI_emptybuff (void)
-{
- lbuffer.size = 0; /* prepare for next string */
-}
-
-
-static void addnchar (char *s, int n)
-{
- char *b = openspace(n);
- strncpy(b, s, n);
- lbuffer.size += n;
-}
-
-static void addstr (char *s)
-{
- addnchar(s, strlen(s));
-}
-
-
-/*
-** Return the string length
-*/
-static void str_len (void)
-{
- lua_pushnumber(strlen(luaL_check_string(1)));
-}
-
-/*
-** Return the substring of a string
-*/
-static void str_sub (void)
-{
- char *s = luaL_check_string(1);
- long l = strlen(s);
- long start = (long)luaL_check_number(2);
- long end = (long)luaL_opt_number(3, -1);
- if (start < 0) start = l+start+1;
- if (end < 0) end = l+end+1;
- if (1 <= start && start <= end && end <= l) {
- luaI_emptybuff();
- addnchar(s+start-1, end-start+1);
- lua_pushstring(luaI_addchar(0));
- }
- else lua_pushstring("");
-}
-
-/*
-** Convert a string to lower case.
-*/
-static void str_lower (void)
-{
- char *s;
- luaI_emptybuff();
- for (s = luaL_check_string(1); *s; s++)
- luaI_addchar(tolower((unsigned char)*s));
- lua_pushstring(luaI_addchar(0));
-}
-
-/*
-** Convert a string to upper case.
-*/
-static void str_upper (void)
-{
- char *s;
- luaI_emptybuff();
- for (s = luaL_check_string(1); *s; s++)
- luaI_addchar(toupper((unsigned char)*s));
- lua_pushstring(luaI_addchar(0));
-}
-
-static void str_rep (void)
-{
- char *s = luaL_check_string(1);
- int n = (int)luaL_check_number(2);
- luaI_emptybuff();
- while (n-- > 0)
- addstr(s);
- lua_pushstring(luaI_addchar(0));
-}
-
-/*
-** get ascii value of a character in a string
-*/
-static void str_ascii (void)
-{
- char *s = luaL_check_string(1);
- long pos = (long)luaL_opt_number(2, 1) - 1;
- luaL_arg_check(0<=pos && pos<strlen(s), 2, "out of range");
- lua_pushnumber((unsigned char)s[pos]);
-}
-
-
-/* pattern matching */
-
-#define ESC '%'
-#define SPECIALS "^$*?.([%-"
-
-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
-
-static struct {
- char *init;
- int len; /* -1 signals unfinished capture */
-} capture[MAX_CAPT];
-
-static int num_captures; /* only valid after a sucessful call to match */
-
-
-static void push_captures (void)
-{
- int i;
- for (i=0; i<num_captures; i++) {
- int l = capture[i].len;
- char *buff = openspace(l+1);
- if (l == -1) lua_error("unfinished capture");
- strncpy(buff, capture[i].init, l);
- buff[l] = 0;
- lua_pushstring(buff);
- }
-}
-
-static int check_cap (int l, int level)
-{
- l -= '1';
- if (!(0 <= l && l < level && capture[l].len != -1))
- lua_error("invalid capture index");
- return l;
-}
-
-static int capture_to_close (int level)
-{
- for (level--; level>=0; level--)
- if (capture[level].len == -1) return level;
- lua_error("invalid pattern capture");
- return 0; /* to avoid warnings */
-}
-
-static char *matchbalance (char *s, int b, int e)
-{
- if (*s != b) return NULL;
- else {
- int cont = 1;
- while (*(++s)) {
- if (*s == e) {
- if (--cont == 0) return s+1;
- }
- else if (*s == b) cont++;
- }
- }
- return NULL; /* string ends out of balance */
-}
-
-static char *match (char *s, char *p, int level)
-{
- init: /* using goto's to optimize tail recursion */
- switch (*p) {
- case '(': /* start capture */
- if (level >= MAX_CAPT) lua_error("too many captures");
- capture[level].init = s;
- capture[level].len = -1;
- level++; p++; goto init; /* return match(s, p+1, level); */
- case ')': { /* end capture */
- int l = capture_to_close(level);
- char *res;
- capture[l].len = s - capture[l].init; /* close capture */
- if ((res = match(s, p+1, level)) == NULL) /* match failed? */
- capture[l].len = -1; /* undo capture */
- 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 */
- if (*p == 0 || (*(p+1) == 0 && *s == 0)) {
- num_captures = level;
- return s;
- }
- else goto dflt;
- default: dflt: { /* it is a pattern item */
- int m = luaL_singlematch(*s, p);
- char *ep = luaL_item_end(p); /* get what is next */
- switch (*ep) {
- case '*': { /* repetition */
- char *res;
- if (m && (res = match(s+1, p, level)))
- return res;
- p=ep+1; goto init; /* else return match(s, ep+1, level); */
- }
- case '-': { /* repetition */
- char *res;
- if ((res = match(s, ep+1, level)) != 0)
- return res;
- else if (m) {
- s++;
- goto init; /* return match(s+1, p, level); */
- }
- else
- return NULL;
- }
- case '?': { /* optional */
- char *res;
- if (m && (res = match(s+1, ep+1, level)))
- return res;
- p=ep+1; goto init; /* else return match(s, ep+1, level); */
- }
- default:
- if (m) { s++; p=ep; goto init; } /* return match(s+1, ep, level); */
- else return NULL;
- }
- }
- }
-}
-
-static void str_find (void)
-{
- char *s = luaL_check_string(1);
- char *p = luaL_check_string(2);
- long init = (long)luaL_opt_number(3, 1) - 1;
- luaL_arg_check(0 <= init && init <= strlen(s), 3, "out of range");
- if (lua_getparam(4) != LUA_NOOBJECT ||
- strpbrk(p, SPECIALS) == NULL) { /* no special caracters? */
- char *s2 = strstr(s+init, p);
- if (s2) {
- lua_pushnumber(s2-s+1);
- lua_pushnumber(s2-s+strlen(p));
- }
- }
- else {
- int anchor = (*p == '^') ? (p++, 1) : 0;
- char *s1=s+init;
- do {
- char *res;
- if ((res=match(s1, p, 0)) != NULL) {
- lua_pushnumber(s1-s+1); /* start */
- lua_pushnumber(res-s); /* end */
- push_captures();
- return;
- }
- } while (*s1++ && !anchor);
- }
-}
-
-static void add_s (lua_Object newp, lua_Object table, int n)
-{
- if (lua_isstring(newp)) {
- char *news = lua_getstring(newp);
- while (*news) {
- if (*news != ESC || !isdigit((unsigned char)*++news))
- luaI_addchar(*news++);
- else {
- int l = check_cap(*news++, num_captures);
- addnchar(capture[l].init, capture[l].len);
- }
- }
- }
- else if (lua_isfunction(newp)) {
- lua_Object res;
- struct lbuff oldbuff;
- int status;
- lua_beginblock();
- if (lua_istable(table)) {
- lua_pushobject(table);
- lua_pushnumber(n);
- }
- push_captures();
- /* function may use lbuffer, so save it and create a new one */
- oldbuff = lbuffer;
- lbuffer.b = NULL; lbuffer.max = lbuffer.size = 0;
- status = lua_callfunction(newp);
- /* restore old buffer */
- free(lbuffer.b);
- lbuffer = oldbuff;
- if (status != 0)
- lua_error(NULL);
- res = lua_getresult(1);
- addstr(lua_isstring(res) ? lua_getstring(res) : "");
- lua_endblock();
- }
- else luaL_arg_check(0, 3, NULL);
-}
-
-static void str_gsub (void)
-{
- char *src = luaL_check_string(1);
- char *p = luaL_check_string(2);
- lua_Object newp = lua_getparam(3);
- lua_Object table = lua_getparam(4);
- int max_s = (int)luaL_opt_number(lua_istable(table)?5:4, strlen(src)+1);
- int anchor = (*p == '^') ? (p++, 1) : 0;
- int n = 0;
- luaI_emptybuff();
- while (n < max_s) {
- char *e = match(src, p, 0);
- if (e) {
- n++;
- add_s(newp, table, n);
- }
- if (e && e>src) /* non empty match? */
- src = e; /* skip it */
- else if (*src)
- luaI_addchar(*src++);
- else break;
- if (anchor) break;
- }
- addstr(src);
- lua_pushstring(luaI_addchar(0));
- 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)
-{
- luaI_addchar('"');
- for (; *s; s++) {
- if (strchr("\"\\\n", *s))
- luaI_addchar('\\');
- luaI_addchar(*s);
- }
- luaI_addchar('"');
-}
-
-#define MAX_FORMAT 200
-
-static void str_format (void)
-{
- int arg = 1;
- char *strfrmt = luaL_check_string(arg);
- luaI_emptybuff(); /* initialize */
- while (*strfrmt) {
- if (*strfrmt != '%')
- luaI_addchar(*strfrmt++);
- else if (*++strfrmt == '%')
- luaI_addchar(*strfrmt++); /* %% */
- else { /* format item */
- char form[MAX_FORMAT]; /* store the format ('%...') */
- char *buff;
- char *initf = strfrmt;
- form[0] = '%';
- strfrmt = match(strfrmt, "%d?%$?[-+ #]*(%d*)%.?(%d*)", 0);
- if (capture[0].len > 3 || capture[1].len > 3) /* < 1000? */
- lua_error("invalid format (width or precision too long)");
- if (isdigit((unsigned char)initf[0]) && initf[1] == '$') {
- arg = initf[0] - '0';
- initf += 2; /* skip the 'n$' */
- }
- arg++;
- strncpy(form+1, initf, strfrmt-initf+1); /* +1 to include convertion */
- form[strfrmt-initf+2] = 0;
- buff = openspace(1000); /* to store the formated value */
- switch (*strfrmt++) {
- case 'q':
- luaI_addquoted(luaL_check_string(arg));
- continue;
- case 's': {
- char *s = luaL_check_string(arg);
- buff = openspace(strlen(s));
- sprintf(buff, form, s);
- break;
- }
- case 'c': case 'd': case 'i': case 'o':
- case 'u': case 'x': case 'X':
- sprintf(buff, form, (int)luaL_check_number(arg));
- break;
- case 'e': case 'E': case 'f': case 'g':
- sprintf(buff, form, luaL_check_number(arg));
- break;
- default: /* also treat cases 'pnLlh' */
- lua_error("invalid format option in function `format'");
- }
- lbuffer.size += strlen(buff);
- }
- }
- lua_pushstring(luaI_addchar(0)); /* push the result */
-}
-
-
-static struct luaL_reg strlib[] = {
-{"strlen", str_len},
-{"strsub", str_sub},
-{"strset", str_set},
-{"strlower", str_lower},
-{"strupper", str_upper},
-{"strrep", str_rep},
-{"ascii", str_ascii},
-{"format", str_format},
-{"strfind", str_find},
-{"gsub", str_gsub}
-};
-
-
-/*
-** Open string library
-*/
-void strlib_open (void)
-{
- luaL_openlib(strlib, (sizeof(strlib)/sizeof(strlib[0])));
-}
diff --git a/strlib.h b/strlib.h
@@ -1,13 +0,0 @@
-/*
-** String library to LUA
-** TeCGraf - PUC-Rio
-** $Id: $
-*/
-
-
-#ifndef strlib_h
-
-void strlib_open (void);
-
-#endif
-
