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Diffstat (limited to 'src/st/croco/cr-selector.c')
| -rw-r--r-- | src/st/croco/cr-selector.c | 305 |
1 files changed, 305 insertions, 0 deletions
diff --git a/src/st/croco/cr-selector.c b/src/st/croco/cr-selector.c new file mode 100644 index 0000000..c9aad43 --- /dev/null +++ b/src/st/croco/cr-selector.c @@ -0,0 +1,305 @@ +/* -*- Mode: C; indent-tabs-mode: nil; c-basic-offset: 8 -*- */ + +/* + * This file is part of The Croco Library + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2.1 of the GNU Lesser General Public + * License as published by the Free Software Foundation. + * + * 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 Lesser 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 + * + * See COPYRIGHTS file for copyright information. + */ + +#include <string.h> +#include "cr-selector.h" +#include "cr-parser.h" + +/** + * cr_selector_new: + * + *@a_simple_sel: the initial simple selector list + *of the current instance of #CRSelector. + * + *Creates a new instance of #CRSelector. + * + *Returns the newly built instance of #CRSelector, or + *NULL in case of failure. + */ +CRSelector * +cr_selector_new (CRSimpleSel * a_simple_sel) +{ + CRSelector *result = NULL; + + result = g_try_malloc (sizeof (CRSelector)); + if (!result) { + cr_utils_trace_info ("Out of memory"); + return NULL; + } + memset (result, 0, sizeof (CRSelector)); + result->simple_sel = a_simple_sel; + return result; +} + +CRSelector * +cr_selector_parse_from_buf (const guchar * a_char_buf, enum CREncoding a_enc) +{ + CRParser *parser = NULL; + + g_return_val_if_fail (a_char_buf, NULL); + + parser = cr_parser_new_from_buf ((guchar*)a_char_buf, strlen ((const char *) a_char_buf), + a_enc, FALSE); + g_return_val_if_fail (parser, NULL); + + return NULL; +} + +/** + * cr_selector_append: + * + *@a_this: the current instance of #CRSelector. + *@a_new: the instance of #CRSelector to be appended. + * + *Appends a new instance of #CRSelector to the current selector list. + * + *Returns the new list. + */ +CRSelector * +cr_selector_append (CRSelector * a_this, CRSelector * a_new) +{ + CRSelector *cur = NULL; + + if (!a_this) { + return a_new; + } + + /*walk forward the list headed by a_this to get the list tail */ + for (cur = a_this; cur && cur->next; cur = cur->next) ; + + cur->next = a_new; + a_new->prev = cur; + + return a_this; +} + +/** + * cr_selector_prepend: + * + *@a_this: the current instance of #CRSelector list. + *@a_new: the instance of #CRSelector. + * + *Prepends an element to the #CRSelector list. + * + *Returns the new list. + */ +CRSelector * +cr_selector_prepend (CRSelector * a_this, CRSelector * a_new) +{ + CRSelector *cur = NULL; + + a_new->next = a_this; + a_this->prev = a_new; + + for (cur = a_new; cur && cur->prev; cur = cur->prev) ; + + return cur; +} + +/** + * cr_selector_append_simple_sel: + * + *@a_this: the current instance of #CRSelector. + *@a_simple_sel: the simple selector to append. + * + *append a simple selector to the current #CRSelector list. + * + *Returns the new list or NULL in case of failure. + */ +CRSelector * +cr_selector_append_simple_sel (CRSelector * a_this, + CRSimpleSel * a_simple_sel) +{ + CRSelector *selector = NULL; + + selector = cr_selector_new (a_simple_sel); + g_return_val_if_fail (selector, NULL); + + return cr_selector_append (a_this, selector); +} + +guchar * +cr_selector_to_string (CRSelector const * a_this) +{ + guchar *result = NULL; + GString *str_buf = NULL; + + str_buf = g_string_new (NULL); + g_return_val_if_fail (str_buf, NULL); + + if (a_this) { + CRSelector const *cur = NULL; + + for (cur = a_this; cur; cur = cur->next) { + if (cur->simple_sel) { + guchar *tmp_str = NULL; + + tmp_str = cr_simple_sel_to_string + (cur->simple_sel); + + if (tmp_str) { + if (cur->prev) + g_string_append (str_buf, + ", "); + + g_string_append (str_buf, (const gchar *) tmp_str); + + g_free (tmp_str); + tmp_str = NULL; + } + } + } + } + + if (str_buf) { + result = (guchar *) g_string_free (str_buf, FALSE); + str_buf = NULL; + } + + return result; +} + +/** + * cr_selector_dump: + * + *@a_this: the current instance of #CRSelector. + *@a_fp: the destination file. + * + *Serializes the current instance of #CRSelector to a file. + */ +void +cr_selector_dump (CRSelector const * a_this, FILE * a_fp) +{ + guchar *tmp_buf = NULL; + + if (a_this) { + tmp_buf = cr_selector_to_string (a_this); + if (tmp_buf) { + fprintf (a_fp, "%s", tmp_buf); + g_free (tmp_buf); + tmp_buf = NULL; + } + } +} + +/** + * cr_selector_ref: + * + *@a_this: the current instance of #CRSelector. + * + *Increments the ref count of the current instance + *of #CRSelector. + */ +void +cr_selector_ref (CRSelector * a_this) +{ + g_return_if_fail (a_this); + + a_this->ref_count++; +} + +/** + * cr_selector_unref: + * + *@a_this: the current instance of #CRSelector. + * + *Decrements the ref count of the current instance of + *#CRSelector. + *If the ref count reaches zero, the current instance of + *#CRSelector is destroyed. + * + *Returns TRUE if this function destroyed the current instance + *of #CRSelector, FALSE otherwise. + */ +gboolean +cr_selector_unref (CRSelector * a_this) +{ + g_return_val_if_fail (a_this, FALSE); + + if (a_this->ref_count) { + a_this->ref_count--; + } + + if (a_this->ref_count == 0) { + cr_selector_destroy (a_this); + return TRUE; + } + + return FALSE; +} + +/** + * cr_selector_destroy: + * + *@a_this: the current instance of #CRSelector. + * + *Destroys the selector list. + */ +void +cr_selector_destroy (CRSelector * a_this) +{ + CRSelector *cur = NULL; + + g_return_if_fail (a_this); + + /* + *go and get the list tail. In the same time, free + *all the simple selectors contained in the list. + */ + for (cur = a_this; cur && cur->next; cur = cur->next) { + if (cur->simple_sel) { + cr_simple_sel_destroy (cur->simple_sel); + cur->simple_sel = NULL; + } + } + + if (cur) { + if (cur->simple_sel) { + cr_simple_sel_destroy (cur->simple_sel); + cur->simple_sel = NULL; + } + } + + /*in case the list has only one element */ + if (cur && !cur->prev) { + g_free (cur); + return; + } + + /*walk backward the list and free each "next element" */ + for (cur = cur->prev; cur && cur->prev; cur = cur->prev) { + if (cur->next) { + g_free (cur->next); + cur->next = NULL; + } + } + + if (!cur) + return; + + if (cur->next) { + g_free (cur->next); + cur->next = NULL; + } + + g_free (cur); +} |