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/*
* SPL - The SPL Programming Language
* Copyright (C) 2004, 2005 Clifford Wolf <clifford@clifford.at>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* string.c: SPL string implementation
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <assert.h>
#include "spl.h"
#include "compat.h"
#define newlen(a,b) (a+b < a || a+b >= ~0U >> 1 ? ~0U : a+b)
struct spl_string *spl_string_new(int flags, struct spl_string *left, struct spl_string *right, char *text, struct spl_code *code)
{
struct spl_string *s = calloc(1, sizeof(struct spl_string));
if (flags & SPL_STRING_NOAUTOGET) {
s->left = left;
s->right = right;
} else {
s->left = spl_string_get(left);
s->right = spl_string_get(right);
}
if (s->left) {
s->left_len = s->left->total_len;
if (s->left->flags & SPL_STRING_UTF8)
s->flags |= SPL_STRING_UTF8;
}
if (s->right) {
s->right_len = s->right->total_len;
if (s->right->flags & SPL_STRING_UTF8)
s->flags |= SPL_STRING_UTF8;
}
s->flags = flags & ~SPL_STRING_NOAUTOGET;
s->ref_counter = 1;
if (text) {
int i = 0;
while (text[i])
if (text[i++] & 0x80)
s->flags |= SPL_STRING_UTF8;
s->text = text;
s->text_len = i;
}
if (code) {
s->code = spl_code_get(code);
s->flags |= SPL_STRING_STATIC;
}
s->total_len = newlen(s->total_len, s->left_len);
s->total_len = newlen(s->total_len, s->text_len);
s->total_len = newlen(s->total_len, s->right_len);
if (s->flags & SPL_STRING_DOTCAT)
s->total_len = newlen(s->total_len, 1);
return s;
}
struct spl_string *spl_string_printf(int flags, struct spl_string *left, struct spl_string *right, const char *fmt, ...)
{
char *text = 0;
if (fmt) {
va_list ap;
va_start(ap, fmt);
my_vasprintf(&text, fmt, ap);
va_end(ap);
}
return spl_string_new(flags, left, right, text, 0);
}
struct spl_string *spl_string_split(struct spl_string *s, unsigned int offset, unsigned int len)
{
if (!s) {
assert(len == 0);
return 0;
}
assert(offset+len <= s->total_len);
if (len < 128) {
char *text = spl_string(s);
return spl_string_new(0, 0, 0, my_strndup(text+offset, len), 0);
} else {
struct spl_string *r = spl_string_new(0, s, 0, 0, 0);
r->left_offset = offset;
r->left_len = len;
r->total_len = len;
return r;
}
}
struct spl_string *spl_string_get(struct spl_string *s)
{
if (s)
s->ref_counter++;
return s;
}
void spl_string_put(struct spl_string *s)
{
if (s && --(s->ref_counter) == 0) {
spl_string_put(s->left);
spl_string_put(s->right);
spl_code_put(s->code);
if ((s->flags & SPL_STRING_STATIC) == 0 && s->text)
free(s->text);
free(s);
}
}
static char *spl_string_write(struct spl_string *s, int *flags_p, char *t, unsigned int offset, unsigned int len)
{
if (!s) return t;
assert(offset+len <= s->total_len);
if (s->left_len > offset) {
unsigned int left_len = s->left_len - offset;
if (left_len > len)
left_len = len;
if (left_len) {
t = spl_string_write(s->left, flags_p, t, s->left_offset + offset, left_len);
len -= left_len;
}
offset = 0;
} else
offset -= s->left_len;
if ((s->flags & SPL_STRING_DOTCAT) != 0) {
if (offset) {
offset--;
} else {
*(t++) = '.';
len--;
}
}
if (s->text_len > offset) {
unsigned int text_len = s->text_len - offset;
if (text_len > len)
text_len = len;
if (text_len) {
int found_utf8 = 0;
for (unsigned int i=0; i<text_len; i++)
if ((t[i] = s->text[offset+i]) & 0x80)
found_utf8 = 1;
if (found_utf8)
*flags_p |= SPL_STRING_UTF8;
len -= text_len;
t += text_len;
}
offset = 0;
} else
offset -= s->text_len;
return spl_string_write(s->right, flags_p, t, offset, len);
}
char *spl_string(struct spl_string *s)
{
if (!s) return "";
if (!s->left && !s->right) return s->text ? s->text : "";
s->flags &= ~SPL_STRING_UTF8;
assert(s->total_len != ~0U);
char *newtext = malloc(s->total_len + 1);
*(spl_string_write(s, &s->flags, newtext, 0, s->total_len)) = 0;
spl_string_put(s->left);
spl_string_put(s->right);
spl_code_put(s->code);
s->left = s->right = 0;
s->left_offset = s->right_offset = 0;
s->left_len = s->right_len = 0;
s->code = 0;
if ( (s->flags & SPL_STRING_STATIC) == 0 && s->text )
free(s->text);
s->text_len = s->total_len;
s->text = newtext;
s->flags = s->flags & ~(SPL_STRING_STATIC|SPL_STRING_DOTCAT);
return newtext;
}
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