Adding upstream version 1.2.2.upstream/1.2.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 197 insertions, 0 deletions

diff --git a/src/xml/rebase-hrefs.cpp b/src/xml/rebase-hrefs.cpp
new file mode 100644
index 0000000..d047280
--- /dev/null
+++ b/src/xml/rebase-hrefs.cpp
@@ -0,0 +1,197 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * TODO: insert short description here
+ *//*
+ * Authors: see git history
+ *
+ * Copyright (C) 2018 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <glibmm/convert.h>
+#include <glibmm/miscutils.h>
+#include <glibmm/uriutils.h>
+#include <glibmm/utility.h>
+
+#include "../document.h"  /* Unfortunately there's a separate xml/document.h. */
+#include "streq.h"
+
+#include "io/dir-util.h"
+#include "io/sys.h"
+
+#include "object/sp-object.h"
+#include "object/uri.h"
+
+#include "xml/node.h"
+#include "xml/rebase-hrefs.h"
+
+using Inkscape::XML::AttributeRecord;
+using Inkscape::XML::AttributeVector;
+
+/**
+ * Determine if a href needs rebasing.
+ */
+static bool href_needs_rebasing(char const *href)
+{
+    // RFC 3986 defines empty string relative URL as referring to the
+    // containing document, rather than referring to the base URI.
+    if (!href[0] || href[0] == '#') {
+        return false;
+    }
+
+    // skip document-local queries
+    if (href[0] == '?') {
+        return false;
+    }
+
+    // skip absolute-path and network-path references
+    if (href[0] == '/') {
+        return false;
+    }
+
+    // Don't change non-file URIs (like data or http)
+    auto scheme = Glib::make_unique_ptr_gfree(g_uri_parse_scheme(href));
+    return !scheme || streq(scheme.get(), "file");
+}
+
+AttributeVector
+Inkscape::XML::rebase_href_attrs(gchar const *const old_abs_base,
+                                 gchar const *const new_abs_base,
+                                 const AttributeVector &attributes)
+{
+    using Inkscape::Util::share_string;
+
+    auto ret = attributes; // copy
+
+    if (old_abs_base == new_abs_base) {
+        return ret;
+    }
+
+    static GQuark const href_key = g_quark_from_static_string("xlink:href");
+    static GQuark const absref_key = g_quark_from_static_string("sodipodi:absref");
+
+    auto const find_record = [&ret](GQuark const key) {
+        return find_if(ret.begin(), ret.end(), [key](auto const &attr) { return attr.key == key; });
+    };
+
+    auto href_it = find_record(href_key);
+    if (href_it == ret.end() || !href_needs_rebasing(href_it->value.pointer())) {
+        return ret;
+    }
+
+    auto uri = URI::from_href_and_basedir(href_it->value.pointer(), old_abs_base);
+    auto abs_href = uri.toNativeFilename();
+
+    auto absref_it = find_record(absref_key);
+    if (absref_it != ret.end()) {
+        if (g_file_test(abs_href.c_str(), G_FILE_TEST_EXISTS)) {
+            if (!streq(abs_href.c_str(), absref_it->value.pointer())) {
+                absref_it->value = share_string(abs_href.c_str());
+            }
+        } else if (g_file_test(absref_it->value.pointer(), G_FILE_TEST_EXISTS)) {
+            uri = URI::from_native_filename(absref_it->value.pointer());
+        }
+    }
+
+    std::string baseuri;
+    if (new_abs_base && new_abs_base[0]) {
+        baseuri = URI::from_dirname(new_abs_base).str();
+    }
+
+    auto new_href = uri.str(baseuri.c_str());
+    href_it->value = share_string(new_href.c_str());
+
+    return ret;
+}
+
+void Inkscape::XML::rebase_hrefs(SPDocument *const doc, gchar const *const new_base, bool const spns)
+{
+    using Inkscape::URI;
+
+    std::string old_base_url_str = URI::from_dirname(doc->getDocumentBase()).str();
+    std::string new_base_url_str;
+
+    if (new_base) {
+        new_base_url_str = URI::from_dirname(new_base).str();
+    }
+
+    /* TODO: Should handle not just image but also:
+     *
+     *    a, altGlyph, animElementAttrs, animate, animateColor, animateMotion, animateTransform,
+     *    animation, audio, color-profile, cursor, definition-src, discard, feImage, filter,
+     *    font-face-uri, foreignObject, glyphRef, handler, linearGradient, mpath, pattern,
+     *    prefetch, radialGradient, script, set, textPath, tref, use, video
+     *
+     * (taken from the union of the xlink:href elements listed at
+     * http://www.w3.org/TR/SVG11/attindex.html and
+     * http://www.w3.org/TR/SVGMobile12/attributeTable.html).
+     *
+     * Also possibly some other attributes of type <URI> or <IRI> or list-thereof, or types like
+     * <paint> that can include an IRI/URI, and stylesheets and style attributes.  (xlink:base is a
+     * special case.  xlink:role and xlink:arcrole can be assumed to be already absolute, based on
+     * http://www.w3.org/TR/SVG11/struct.html#xlinkRefAttrs .)
+     *
+     * Note that it may not useful to set sodipodi:absref for anything other than image.
+     *
+     * Note also that Inkscape only supports fragment hrefs (href="#pattern257") for many of these
+     * cases. */
+    std::vector<SPObject *> images = doc->getResourceList("image");
+    for (auto image : images) {
+        Inkscape::XML::Node *ir = image->getRepr();
+
+        auto href_cstr = ir->attribute("xlink:href");
+        if (!href_cstr) {
+            continue;
+        }
+
+        if (!href_needs_rebasing(href_cstr)) {
+            continue;
+        }
+
+        // make absolute
+        URI url;
+        try {
+            url = URI(href_cstr, old_base_url_str.c_str());
+        } catch (...) {
+            continue;
+        }
+
+        // skip non-file URLs
+        if (!url.hasScheme("file")) {
+            continue;
+        }
+
+        // if path doesn't exist, use sodipodi:absref
+        if (!g_file_test(url.toNativeFilename().c_str(), G_FILE_TEST_EXISTS)) {
+            auto spabsref = ir->attribute("sodipodi:absref");
+            if (spabsref && g_file_test(spabsref, G_FILE_TEST_EXISTS)) {
+                url = URI::from_native_filename(spabsref);
+            }
+        } else if (spns) {
+            ir->setAttributeOrRemoveIfEmpty("sodipodi:absref", url.toNativeFilename());
+        }
+
+        if (!spns) {
+            ir->removeAttribute("sodipodi:absref");
+        }
+
+        auto href_str = url.str(new_base_url_str.c_str());
+        href_str = Inkscape::uri_to_iri(href_str.c_str());
+
+        ir->setAttribute("xlink:href", href_str);
+    }
+
+    doc->setDocumentBase(new_base);
+}
+
+
+/*
+  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:
+*/
+// vi: set autoindent shiftwidth=4 tabstop=8 filetype=cpp expandtab softtabstop=4 fileencoding=utf-8 textwidth=99 :