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/*
* narrative.c
*
* Copyright © 2019 Thomas White <taw@bitwiz.org.uk>
*
* This file is part of Colloquium.
*
* Colloquium 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "narrative.h"
#include "narrative_priv.h"
Narrative *narrative_new()
{
Narrative *n;
n = malloc(sizeof(*n));
if ( n == NULL ) return NULL;
n->n_items = 0;
n->items = NULL;
return n;
}
static void narrative_item_destroy(struct narrative_item *item)
{
free(item->text);
#ifdef HAVE_PANGO
if ( item->layout != NULL ) {
g_object_unref(item->layout);
}
#endif
#ifdef HAVE_CAIRO
if ( item->slide_thumbnail != NULL ) {
cairo_surface_destroy(item->slide_thumbnail);
}
#endif
}
void narrative_free(Narrative *n)
{
int i;
for ( i=0; i<n->n_items; i++ ) {
narrative_item_destroy(&n->items[i]);
}
free(n->items);
free(n);
}
static struct narrative_item *add_item(Narrative *n)
{
struct narrative_item *new_items;
struct narrative_item *item;
new_items = realloc(n->items, (n->n_items+1)*sizeof(struct narrative_item));
if ( new_items == NULL ) return NULL;
n->items = new_items;
item = &n->items[n->n_items++];
item->layout = NULL;
item->text = NULL;
item->slide = NULL;
item->slide_thumbnail = NULL;
return item;
}
void narrative_add_prestitle(Narrative *n, char *text)
{
struct narrative_item *item;
item = add_item(n);
if ( item == NULL ) return;
item->type = NARRATIVE_ITEM_PRESTITLE;
item->text = text;
item->align = ALIGN_LEFT;
item->layout = NULL;
}
void narrative_add_bp(Narrative *n, char *text)
{
struct narrative_item *item;
item = add_item(n);
if ( item == NULL ) return;
item->type = NARRATIVE_ITEM_BP;
item->text = text;
item->align = ALIGN_LEFT;
item->layout = NULL;
}
void narrative_add_text(Narrative *n, char *text)
{
struct narrative_item *item;
item = add_item(n);
if ( item == NULL ) return;
item->type = NARRATIVE_ITEM_TEXT;
item->text = text;
item->align = ALIGN_LEFT;
item->layout = NULL;
}
void narrative_add_slide(Narrative *n, Slide *slide)
{
struct narrative_item *item;
item = add_item(n);
if ( item == NULL ) return;
item->type = NARRATIVE_ITEM_SLIDE;
item->slide = slide;
item->slide_thumbnail = NULL;
}
static void delete_item(Narrative *n, int del)
{
int i;
narrative_item_destroy(&n->items[del]);
for ( i=del; i<n->n_items-1; i++ ) {
n->items[i] = n->items[i+1];
}
n->n_items--;
}
/* Delete from item i1 offset o1 to item i2 offset o2, inclusive */
void narrative_delete_block(Narrative *n, int i1, size_t o1, int i2, size_t o2)
{
int i;
int merge = 1;
/* Starting item */
if ( n->items[i1].type == NARRATIVE_ITEM_SLIDE ) {
delete_item(n, i1);
i1--;
i2--;
merge = 0;
} else {
if ( i1 == i2 ) {
memmove(&n->items[i1].text[o1],
&n->items[i1].text[o2],
strlen(n->items[i1].text)-o2+1);
return; /* easy case */
} else {
n->items[i1].text[o1] = '\0';
}
}
/* Middle items */
for ( i=i1+1; i<i2; i++ ) {
delete_item(n, i);
i2--;
}
/* Last item */
if ( n->items[i2].type == NARRATIVE_ITEM_SLIDE ) {
delete_item(n, i2);
merge = 0;
} else {
memmove(&n->items[i2].text[0],
&n->items[i2].text[o2], o2);
}
/* If the start and end points are in different paragraphs, and both
* of them are text (any kind), merge them. Note that at this point,
* we know that i1 and i2 are different because otherwise we would've
* returned earlier ("easy case"). */
assert(i1 != i2);
if ( merge ) {
char *new_text;
size_t len = strlen(n->items[i1].text);
len += strlen(n->items[i2].text);
new_text = malloc(len+1);
if ( new_text == NULL ) return;
strcpy(new_text, n->items[i1].text);
strcat(new_text, n->items[i2].text);
free(n->items[i1].text);
n->items[i1].text = new_text;
delete_item(n, i2);
}
}
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