From 75ac0d217266dba48a887df96d37398140e22b9e Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Tue, 16 Sep 1997 16:25:59 -0300
Subject: Standard library for strings and pattern-matching
---
lstrlib.c | 534 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 534 insertions(+)
create mode 100644 lstrlib.c
(limited to 'lstrlib.c')
diff --git a/lstrlib.c b/lstrlib.c
new file mode 100644
index 00000000..eba282de
--- /dev/null
+++ 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])));
+}
--
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