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/** \file
* Routines for resolving ID clashes when importing or pasting.
*
* Authors:
* Stephen Silver <sasilver@users.sourceforge.net>
* Jon A. Cruz <jon@joncruz.org>
* Abhishek Sharma
*
* Copyright (C) 2008 authors
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include <cstdlib>
#include <cstring>
#include <list>
#include <map>
#include <string>
#include <utility>
#include "extract-uri.h"
#include "id-clash.h"
#include "sp-object.h"
#include "style.h"
#include "sp-paint-server.h"
#include "xml/node.h"
#include "xml/repr.h"
#include "sp-root.h"
typedef enum { REF_HREF, REF_STYLE, REF_URL, REF_CLIPBOARD } ID_REF_TYPE;
struct IdReference {
ID_REF_TYPE type;
SPObject *elem;
const char *attr; // property or href-like attribute
};
typedef std::map<std::string, std::list<IdReference> > refmap_type;
typedef std::pair<SPObject*, std::string> id_changeitem_type;
typedef std::list<id_changeitem_type> id_changelist_type;
const char *href_like_attributes[] = {
"inkscape:connection-end",
"inkscape:connection-start",
"inkscape:href",
"inkscape:path-effect",
"inkscape:perspectiveID",
"inkscape:tiled-clone-of",
"xlink:href",
};
#define NUM_HREF_LIKE_ATTRIBUTES (sizeof(href_like_attributes) / sizeof(*href_like_attributes))
const SPIPaint SPStyle::* SPIPaint_members[] = {
&SPStyle::color,
&SPStyle::fill,
&SPStyle::stroke,
};
const char* SPIPaint_properties[] = {
"color",
"fill",
"stroke",
};
#define NUM_SPIPAINT_PROPERTIES (sizeof(SPIPaint_properties) / sizeof(*SPIPaint_properties))
const char* other_url_properties[] = {
"clip-path",
"color-profile",
"cursor",
"marker-end",
"marker-mid",
"marker-start",
"mask",
};
#define NUM_OTHER_URL_PROPERTIES (sizeof(other_url_properties) / sizeof(*other_url_properties))
const char* clipboard_properties[] = {
"color",
"fill",
"filter",
"stroke",
};
#define NUM_CLIPBOARD_PROPERTIES (sizeof(clipboard_properties) / sizeof(*clipboard_properties))
/**
* Build a table of places where IDs are referenced, for a given element.
* FIXME: There are some types of references not yet dealt with here
* (e.g., ID selectors in CSS stylesheets, and references in scripts).
*/
static void
find_references(SPObject *elem, refmap_type *refmap)
{
if (elem->cloned) return;
Inkscape::XML::Node *repr_elem = elem->getRepr();
if (!repr_elem) return;
if (repr_elem->type() != Inkscape::XML::ELEMENT_NODE) return;
/* check for references in inkscape:clipboard elements */
if (!std::strcmp(repr_elem->name(), "inkscape:clipboard")) {
SPCSSAttr *css = sp_repr_css_attr(repr_elem, "style");
if (css) {
for (unsigned i = 0; i < NUM_CLIPBOARD_PROPERTIES; ++i) {
const char *attr = clipboard_properties[i];
const gchar *value = sp_repr_css_property(css, attr, NULL);
if (value) {
gchar *uri = extract_uri(value);
if (uri && uri[0] == '#') {
IdReference idref = { REF_CLIPBOARD, elem, attr };
(*refmap)[uri+1].push_back(idref);
}
g_free(uri);
}
}
}
return; // nothing more to do for inkscape:clipboard elements
}
/* check for xlink:href="#..." and similar */
for (unsigned i = 0; i < NUM_HREF_LIKE_ATTRIBUTES; ++i) {
const char *attr = href_like_attributes[i];
const gchar *val = repr_elem->attribute(attr);
if (val && val[0] == '#') {
std::string id(val+1);
IdReference idref = { REF_HREF, elem, attr };
(*refmap)[id].push_back(idref);
}
}
SPStyle *style = elem->style;
/* check for url(#...) references in 'fill' or 'stroke' */
for (unsigned i = 0; i < NUM_SPIPAINT_PROPERTIES; ++i) {
const SPIPaint SPStyle::*prop = SPIPaint_members[i];
const SPIPaint *paint = &(style->*prop);
if (paint->isPaintserver() && paint->value.href) {
const SPObject *obj = paint->value.href->getObject();
if (obj) {
const gchar *id = obj->getId();
IdReference idref = { REF_STYLE, elem, SPIPaint_properties[i] };
(*refmap)[id].push_back(idref);
}
}
}
/* check for url(#...) references in 'filter' */
const SPIFilter *filter = &(style->filter);
if (filter->href) {
const SPObject *obj = filter->href->getObject();
if (obj) {
const gchar *id = obj->getId();
IdReference idref = { REF_STYLE, elem, "filter" };
(*refmap)[id].push_back(idref);
}
}
/* check for other url(#...) references */
for (unsigned i = 0; i < NUM_OTHER_URL_PROPERTIES; ++i) {
const char *attr = other_url_properties[i];
const gchar *value = repr_elem->attribute(attr);
if (value) {
gchar *uri = extract_uri(value);
if (uri && uri[0] == '#') {
IdReference idref = { REF_URL, elem, attr };
(*refmap)[uri+1].push_back(idref);
}
g_free(uri);
}
}
// recurse
for (SPObject *child = elem->firstChild(); child; child = child->getNext() )
{
find_references(child, refmap);
}
}
/**
* Change any IDs that clash with IDs in the current document, and make
* a list of those changes that will require fixing up references.
*/
static void
change_clashing_ids(SPDocument *imported_doc, SPDocument *current_doc,
SPObject *elem, const refmap_type *refmap,
id_changelist_type *id_changes)
{
const gchar *id = elem->getId();
if (id && current_doc->getObjectById(id)) {
// Choose a new ID.
// To try to preserve any meaningfulness that the original ID
// may have had, the new ID is the old ID followed by a hyphen
// and one or more digits.
std::string old_id(id);
std::string new_id(old_id + '-');
for (;;) {
new_id += "0123456789"[std::rand() % 10];
const char *str = new_id.c_str();
if (current_doc->getObjectById(str) == NULL &&
imported_doc->getObjectById(str) == NULL) break;
}
// Change to the new ID
elem->getRepr()->setAttribute("id", new_id.c_str());
// Make a note of this change, if we need to fix up refs to it
if (refmap->find(old_id) != refmap->end())
id_changes->push_back(id_changeitem_type(elem, old_id));
}
// recurse
for (SPObject *child = elem->firstChild(); child; child = child->getNext() )
{
change_clashing_ids(imported_doc, current_doc, child, refmap, id_changes);
}
}
/**
* Fix up references to changed IDs.
*/
static void
fix_up_refs(const refmap_type *refmap, const id_changelist_type &id_changes)
{
id_changelist_type::const_iterator pp;
const id_changelist_type::const_iterator pp_end = id_changes.end();
for (pp = id_changes.begin(); pp != pp_end; ++pp) {
SPObject *obj = pp->first;
refmap_type::const_iterator pos = refmap->find(pp->second);
std::list<IdReference>::const_iterator it;
const std::list<IdReference>::const_iterator it_end = pos->second.end();
for (it = pos->second.begin(); it != it_end; ++it) {
if (it->type == REF_HREF) {
gchar *new_uri = g_strdup_printf("#%s", obj->getId());
it->elem->getRepr()->setAttribute(it->attr, new_uri);
g_free(new_uri);
} else if (it->type == REF_STYLE) {
sp_style_set_property_url(it->elem, it->attr, obj, false);
} else if (it->type == REF_URL) {
gchar *url = g_strdup_printf("url(#%s)", obj->getId());
it->elem->getRepr()->setAttribute(it->attr, url);
g_free(url);
} else if (it->type == REF_CLIPBOARD) {
SPCSSAttr *style = sp_repr_css_attr(it->elem->getRepr(), "style");
gchar *url = g_strdup_printf("url(#%s)", obj->getId());
sp_repr_css_set_property(style, it->attr, url);
g_free(url);
gchar *style_string = sp_repr_css_write_string(style);
it->elem->getRepr()->setAttribute("style", style_string);
g_free(style_string);
} else {
g_assert(0); // shouldn't happen
}
}
}
}
/**
* This function resolves ID clashes between the document being imported
* and the current open document: IDs in the imported document that would
* clash with IDs in the existing document are changed, and references to
* those IDs are updated accordingly.
*/
void
prevent_id_clashes(SPDocument *imported_doc, SPDocument *current_doc)
{
refmap_type *refmap = new refmap_type;
id_changelist_type id_changes;
SPObject *imported_root = imported_doc->getRoot();
find_references(imported_root, refmap);
change_clashing_ids(imported_doc, current_doc, imported_root, refmap,
&id_changes);
fix_up_refs(refmap, id_changes);
delete refmap;
}
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
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