usvg/parser/svgtree/
parse.rs

1// Copyright 2021 the Resvg Authors
2// SPDX-License-Identifier: Apache-2.0 OR MIT
3
4use std::collections::HashMap;
5
6use roxmltree::Error;
7use simplecss::Declaration;
8use svgtypes::FontShorthand;
9
10use super::{AId, Attribute, Document, EId, NodeData, NodeId, NodeKind, ShortRange};
11
12const SVG_NS: &str = "http://www.w3.org/2000/svg";
13const XLINK_NS: &str = "http://www.w3.org/1999/xlink";
14const XML_NAMESPACE_NS: &str = "http://www.w3.org/XML/1998/namespace";
15
16impl<'input> Document<'input> {
17    /// Parses a [`Document`] from a [`roxmltree::Document`].
18    pub fn parse_tree(
19        xml: &roxmltree::Document<'input>,
20        injected_stylesheet: Option<&'input str>,
21    ) -> Result<Document<'input>, Error> {
22        parse(xml, injected_stylesheet)
23    }
24
25    pub(crate) fn append(&mut self, parent_id: NodeId, kind: NodeKind) -> NodeId {
26        let new_child_id = NodeId::from(self.nodes.len());
27        self.nodes.push(NodeData {
28            parent: Some(parent_id),
29            next_sibling: None,
30            children: None,
31            kind,
32        });
33
34        let last_child_id = self.nodes[parent_id.get_usize()].children.map(|(_, id)| id);
35
36        if let Some(id) = last_child_id {
37            self.nodes[id.get_usize()].next_sibling = Some(new_child_id);
38        }
39
40        self.nodes[parent_id.get_usize()].children = Some(
41            if let Some((first_child_id, _)) = self.nodes[parent_id.get_usize()].children {
42                (first_child_id, new_child_id)
43            } else {
44                (new_child_id, new_child_id)
45            },
46        );
47
48        new_child_id
49    }
50
51    fn append_attribute(
52        &mut self,
53        name: AId,
54        value: roxmltree::StringStorage<'input>,
55        important: bool,
56    ) {
57        self.attrs.push(Attribute {
58            name,
59            value,
60            important,
61        });
62    }
63}
64
65fn parse<'input>(
66    xml: &roxmltree::Document<'input>,
67    injected_stylesheet: Option<&'input str>,
68) -> Result<Document<'input>, Error> {
69    let mut doc = Document {
70        nodes: Vec::new(),
71        attrs: Vec::new(),
72        links: HashMap::new(),
73    };
74
75    // build a map of id -> node for resolve_href
76    let mut id_map = HashMap::new();
77    for node in xml.descendants() {
78        if let Some(id) = node.attribute("id") {
79            if !id_map.contains_key(id) {
80                id_map.insert(id, node);
81            }
82        }
83    }
84
85    // Add a root node.
86    doc.nodes.push(NodeData {
87        parent: None,
88        next_sibling: None,
89        children: None,
90        kind: NodeKind::Root,
91    });
92
93    let style_sheet = resolve_css(xml, injected_stylesheet);
94
95    parse_xml_node_children(
96        xml.root(),
97        xml.root(),
98        doc.root().id,
99        &style_sheet,
100        false,
101        0,
102        &mut doc,
103        &id_map,
104    )?;
105
106    // Check that the root element is `svg`.
107    match doc.root().first_element_child() {
108        Some(child) => {
109            if child.tag_name() != Some(EId::Svg) {
110                return Err(roxmltree::Error::NoRootNode);
111            }
112        }
113        None => return Err(roxmltree::Error::NoRootNode),
114    }
115
116    // Collect all elements with `id` attribute.
117    let mut links = HashMap::new();
118    for node in doc.descendants() {
119        if let Some(id) = node.attribute::<&str>(AId::Id) {
120            links.insert(id.to_string(), node.id);
121        }
122    }
123    doc.links = links;
124
125    fix_recursive_patterns(&mut doc);
126    fix_recursive_links(EId::ClipPath, AId::ClipPath, &mut doc);
127    fix_recursive_links(EId::Mask, AId::Mask, &mut doc);
128    fix_recursive_links(EId::Filter, AId::Filter, &mut doc);
129    fix_recursive_fe_image(&mut doc);
130
131    Ok(doc)
132}
133
134pub(crate) fn parse_tag_name(node: roxmltree::Node) -> Option<EId> {
135    if !node.is_element() {
136        return None;
137    }
138
139    if !matches!(node.tag_name().namespace(), None | Some(SVG_NS)) {
140        return None;
141    }
142
143    EId::from_str(node.tag_name().name())
144}
145
146fn parse_xml_node_children<'input>(
147    parent: roxmltree::Node<'_, 'input>,
148    origin: roxmltree::Node,
149    parent_id: NodeId,
150    style_sheet: &simplecss::StyleSheet,
151    ignore_ids: bool,
152    depth: u32,
153    doc: &mut Document<'input>,
154    id_map: &HashMap<&str, roxmltree::Node<'_, 'input>>,
155) -> Result<(), Error> {
156    for node in parent.children() {
157        parse_xml_node(
158            node,
159            origin,
160            parent_id,
161            style_sheet,
162            ignore_ids,
163            depth,
164            doc,
165            id_map,
166        )?;
167    }
168
169    Ok(())
170}
171
172fn parse_xml_node<'input>(
173    node: roxmltree::Node<'_, 'input>,
174    origin: roxmltree::Node,
175    parent_id: NodeId,
176    style_sheet: &simplecss::StyleSheet,
177    ignore_ids: bool,
178    depth: u32,
179    doc: &mut Document<'input>,
180    id_map: &HashMap<&str, roxmltree::Node<'_, 'input>>,
181) -> Result<(), Error> {
182    if depth > 1024 {
183        return Err(Error::NodesLimitReached);
184    }
185
186    let mut tag_name = match parse_tag_name(node) {
187        Some(id) => id,
188        None => return Ok(()),
189    };
190
191    if tag_name == EId::Style {
192        return Ok(());
193    }
194
195    // TODO: remove?
196    // Treat links as groups.
197    if tag_name == EId::A {
198        tag_name = EId::G;
199    }
200
201    let node_id = parse_svg_element(node, parent_id, tag_name, style_sheet, ignore_ids, doc)?;
202    if tag_name == EId::Text {
203        super::text::parse_svg_text_element(node, node_id, style_sheet, doc)?;
204    } else if tag_name == EId::Use {
205        parse_svg_use_element(node, origin, node_id, style_sheet, depth + 1, doc, id_map)?;
206    } else {
207        parse_xml_node_children(
208            node,
209            origin,
210            node_id,
211            style_sheet,
212            ignore_ids,
213            depth + 1,
214            doc,
215            id_map,
216        )?;
217    }
218
219    Ok(())
220}
221
222pub(crate) fn parse_svg_element<'input>(
223    xml_node: roxmltree::Node<'_, 'input>,
224    parent_id: NodeId,
225    tag_name: EId,
226    style_sheet: &simplecss::StyleSheet,
227    ignore_ids: bool,
228    doc: &mut Document<'input>,
229) -> Result<NodeId, Error> {
230    let attrs_start_idx = doc.attrs.len();
231
232    // Copy presentational attributes first.
233    for attr in xml_node.attributes() {
234        match attr.namespace() {
235            None | Some(SVG_NS) | Some(XLINK_NS) | Some(XML_NAMESPACE_NS) => {}
236            _ => continue,
237        }
238
239        let aid = match AId::from_str(attr.name()) {
240            Some(v) => v,
241            None => continue,
242        };
243
244        // During a `use` resolving, all `id` attributes must be ignored.
245        // Otherwise we will get elements with duplicated id's.
246        if ignore_ids && aid == AId::Id {
247            continue;
248        }
249
250        // For some reason those properties are allowed only inside a `style` attribute and CSS.
251        if matches!(aid, AId::MixBlendMode | AId::Isolation | AId::FontKerning) {
252            continue;
253        } else if aid == AId::ImageRendering
254            && matches!(
255                attr.value(),
256                "smooth" | "high-quality" | "crisp-edges" | "pixelated"
257            )
258        {
259            continue;
260        }
261
262        append_attribute(
263            parent_id,
264            tag_name,
265            aid,
266            attr.value_storage().clone(),
267            false,
268            doc,
269        );
270    }
271
272    let mut insert_attribute = |aid, value: &str, important: bool| {
273        // Check that attribute already exists.
274        let idx = doc.attrs[attrs_start_idx..]
275            .iter_mut()
276            .position(|a| a.name == aid);
277
278        // Append an attribute as usual.
279        let added = append_attribute(
280            parent_id,
281            tag_name,
282            aid,
283            roxmltree::StringStorage::new_owned(value),
284            important,
285            doc,
286        );
287
288        // Check that attribute was actually added, because it could be skipped.
289        if added {
290            if let Some(idx) = idx {
291                let last_idx = doc.attrs.len() - 1;
292                let existing_idx = attrs_start_idx + idx;
293
294                // See https://developer.mozilla.org/en-US/docs/Web/CSS/important
295                // When a declaration is important, the order of precedence is reversed.
296                // Declarations marked as important in the user-agent style sheets override
297                // all important declarations in the user style sheets. Similarly, all important
298                // declarations in the user style sheets override all important declarations in the
299                // author's style sheets. Finally, all important declarations take precedence over
300                // all animations.
301                //
302                // Which means:
303                // 1) Existing is not important, new is not important -> swap
304                // 2) Existing is important, new is not important -> don't swap
305                // 3) Existing is not important, new is important -> swap
306                // 4) Existing is important, new is important -> don't swap (since the order
307                // is reversed, so existing important attributes take precedence over new
308                // important attributes)
309                let has_precedence = !doc.attrs[existing_idx].important;
310
311                if has_precedence {
312                    doc.attrs.swap(existing_idx, last_idx);
313                }
314
315                // Remove last.
316                doc.attrs.pop();
317            }
318        }
319    };
320
321    let mut write_declaration = |declaration: &Declaration| {
322        // TODO: perform XML attribute normalization
323        let imp = declaration.important;
324        let val = declaration.value;
325
326        if declaration.name == "marker" {
327            insert_attribute(AId::MarkerStart, val, imp);
328            insert_attribute(AId::MarkerMid, val, imp);
329            insert_attribute(AId::MarkerEnd, val, imp);
330        } else if declaration.name == "font" {
331            if let Ok(shorthand) = FontShorthand::from_str(val) {
332                // First we need to reset all values to their default.
333                insert_attribute(AId::FontStyle, "normal", imp);
334                insert_attribute(AId::FontVariant, "normal", imp);
335                insert_attribute(AId::FontWeight, "normal", imp);
336                insert_attribute(AId::FontStretch, "normal", imp);
337                insert_attribute(AId::LineHeight, "normal", imp);
338                insert_attribute(AId::FontSizeAdjust, "none", imp);
339                insert_attribute(AId::FontKerning, "auto", imp);
340                insert_attribute(AId::FontVariantCaps, "normal", imp);
341                insert_attribute(AId::FontVariantLigatures, "normal", imp);
342                insert_attribute(AId::FontVariantNumeric, "normal", imp);
343                insert_attribute(AId::FontVariantEastAsian, "normal", imp);
344                insert_attribute(AId::FontVariantPosition, "normal", imp);
345
346                // Then, we set the properties that have been declared.
347                shorthand
348                    .font_stretch
349                    .map(|s| insert_attribute(AId::FontStretch, s, imp));
350                shorthand
351                    .font_weight
352                    .map(|s| insert_attribute(AId::FontWeight, s, imp));
353                shorthand
354                    .font_variant
355                    .map(|s| insert_attribute(AId::FontVariant, s, imp));
356                shorthand
357                    .font_style
358                    .map(|s| insert_attribute(AId::FontStyle, s, imp));
359                insert_attribute(AId::FontSize, shorthand.font_size, imp);
360                insert_attribute(AId::FontFamily, shorthand.font_family, imp);
361            } else {
362                log::warn!(
363                    "Failed to parse {} value: '{}'",
364                    AId::Font,
365                    declaration.value
366                );
367            }
368        } else if let Some(aid) = AId::from_str(declaration.name) {
369            // Parse only the presentation attributes.
370            if aid.is_presentation() {
371                insert_attribute(aid, val, imp);
372            }
373        }
374    };
375
376    // Apply CSS.
377    for rule in &style_sheet.rules {
378        if rule.selector.matches(&XmlNode(xml_node)) {
379            for declaration in &rule.declarations {
380                write_declaration(declaration);
381            }
382        }
383    }
384
385    // Split a `style` attribute.
386    if let Some(value) = xml_node.attribute("style") {
387        for declaration in simplecss::DeclarationTokenizer::from(value) {
388            write_declaration(&declaration);
389        }
390    }
391
392    if doc.nodes.len() > 1_000_000 {
393        return Err(Error::NodesLimitReached);
394    }
395
396    let node_id = doc.append(
397        parent_id,
398        NodeKind::Element {
399            tag_name,
400            attributes: ShortRange::new(attrs_start_idx as u32, doc.attrs.len() as u32),
401        },
402    );
403
404    Ok(node_id)
405}
406
407fn append_attribute<'input>(
408    parent_id: NodeId,
409    tag_name: EId,
410    aid: AId,
411    value: roxmltree::StringStorage<'input>,
412    important: bool,
413    doc: &mut Document<'input>,
414) -> bool {
415    match aid {
416        // The `style` attribute will be split into attributes, so we don't need it.
417        AId::Style |
418        // No need to copy a `class` attribute since CSS were already resolved.
419        AId::Class => return false,
420        _ => {}
421    }
422
423    // Ignore `xlink:href` on `tspan` (which was originally `tref` or `a`),
424    // because we will convert `tref` into `tspan` anyway.
425    if tag_name == EId::Tspan && aid == AId::Href {
426        return false;
427    }
428
429    if aid.allows_inherit_value() && &*value == "inherit" {
430        return resolve_inherit(parent_id, aid, doc);
431    }
432
433    doc.append_attribute(aid, value, important);
434    true
435}
436
437fn resolve_inherit(parent_id: NodeId, aid: AId, doc: &mut Document) -> bool {
438    if aid.is_inheritable() {
439        // Inheritable attributes can inherit a value from an any ancestor.
440        let node_id = doc
441            .get(parent_id)
442            .ancestors()
443            .find(|n| n.has_attribute(aid))
444            .map(|n| n.id);
445        if let Some(node_id) = node_id {
446            if let Some(attr) = doc
447                .get(node_id)
448                .attributes()
449                .iter()
450                .find(|a| a.name == aid)
451                .cloned()
452            {
453                doc.attrs.push(Attribute {
454                    name: aid,
455                    value: attr.value,
456                    important: attr.important,
457                });
458
459                return true;
460            }
461        }
462    } else {
463        // Non-inheritable attributes can inherit a value only from a direct parent.
464        if let Some(attr) = doc
465            .get(parent_id)
466            .attributes()
467            .iter()
468            .find(|a| a.name == aid)
469            .cloned()
470        {
471            doc.attrs.push(Attribute {
472                name: aid,
473                value: attr.value,
474                important: attr.important,
475            });
476
477            return true;
478        }
479    }
480
481    // Fallback to a default value if possible.
482    let value = match aid {
483        AId::ImageRendering | AId::ShapeRendering | AId::TextRendering => "auto",
484
485        AId::ClipPath
486        | AId::Filter
487        | AId::MarkerEnd
488        | AId::MarkerMid
489        | AId::MarkerStart
490        | AId::Mask
491        | AId::Stroke
492        | AId::StrokeDasharray
493        | AId::TextDecoration => "none",
494
495        AId::FontStretch
496        | AId::FontStyle
497        | AId::FontVariant
498        | AId::FontWeight
499        | AId::LetterSpacing
500        | AId::WordSpacing => "normal",
501
502        AId::Fill | AId::FloodColor | AId::StopColor => "black",
503
504        AId::FillOpacity
505        | AId::FloodOpacity
506        | AId::Opacity
507        | AId::StopOpacity
508        | AId::StrokeOpacity => "1",
509
510        AId::ClipRule | AId::FillRule => "nonzero",
511
512        AId::BaselineShift => "baseline",
513        AId::ColorInterpolationFilters => "linearRGB",
514        AId::Direction => "ltr",
515        AId::Display => "inline",
516        AId::FontSize => "medium",
517        AId::Overflow => "visible",
518        AId::StrokeDashoffset => "0",
519        AId::StrokeLinecap => "butt",
520        AId::StrokeLinejoin => "miter",
521        AId::StrokeMiterlimit => "4",
522        AId::StrokeWidth => "1",
523        AId::TextAnchor => "start",
524        AId::Visibility => "visible",
525        AId::WritingMode => "lr-tb",
526        _ => return false,
527    };
528
529    doc.append_attribute(aid, roxmltree::StringStorage::Borrowed(value), false);
530    true
531}
532
533fn resolve_href<'a, 'input: 'a>(
534    node: roxmltree::Node<'a, 'input>,
535    id_map: &HashMap<&str, roxmltree::Node<'a, 'input>>,
536) -> Option<roxmltree::Node<'a, 'input>> {
537    let link_value = node
538        .attribute((XLINK_NS, "href"))
539        .or_else(|| node.attribute("href"))?;
540
541    let link_id = svgtypes::IRI::from_str(link_value).ok()?.0;
542
543    id_map.get(link_id).copied()
544}
545
546fn parse_svg_use_element<'input>(
547    node: roxmltree::Node<'_, 'input>,
548    origin: roxmltree::Node,
549    parent_id: NodeId,
550    style_sheet: &simplecss::StyleSheet,
551    depth: u32,
552    doc: &mut Document<'input>,
553    id_map: &HashMap<&str, roxmltree::Node<'_, 'input>>,
554) -> Result<(), Error> {
555    let link = match resolve_href(node, id_map) {
556        Some(v) => v,
557        None => return Ok(()),
558    };
559
560    if link == node || link == origin {
561        log::warn!(
562            "Recursive 'use' detected. '{}' will be skipped.",
563            node.attribute((SVG_NS, "id")).unwrap_or_default()
564        );
565        return Ok(());
566    }
567
568    // Make sure we're linked to an SVG element.
569    if parse_tag_name(link).is_none() {
570        return Ok(());
571    }
572
573    // Check that none of the linked node's children reference current `use` node
574    // via other `use` node.
575    //
576    // Example:
577    // <g id="g1">
578    //     <use xlink:href="#use1" id="use2"/>
579    // </g>
580    // <use xlink:href="#g1" id="use1"/>
581    //
582    // `use2` should be removed.
583    //
584    // Also, child should not reference its parent:
585    // <g id="g1">
586    //     <use xlink:href="#g1" id="use1"/>
587    // </g>
588    //
589    // `use1` should be removed.
590    let mut is_recursive = false;
591    for link_child in link
592        .descendants()
593        .skip(1)
594        .filter(|n| n.has_tag_name((SVG_NS, "use")))
595    {
596        if let Some(link2) = resolve_href(link_child, id_map) {
597            if link2 == node || link2 == link {
598                is_recursive = true;
599                break;
600            }
601        }
602    }
603
604    if is_recursive {
605        log::warn!(
606            "Recursive 'use' detected. '{}' will be skipped.",
607            node.attribute((SVG_NS, "id")).unwrap_or_default()
608        );
609        return Ok(());
610    }
611
612    parse_xml_node(
613        link,
614        node,
615        parent_id,
616        style_sheet,
617        true,
618        depth + 1,
619        doc,
620        id_map,
621    )
622}
623
624fn resolve_css<'a>(
625    xml: &'a roxmltree::Document<'a>,
626    style_sheet: Option<&'a str>,
627) -> simplecss::StyleSheet<'a> {
628    let mut sheet = simplecss::StyleSheet::new();
629
630    // Injected style sheets do not override internal ones (we mimic the logic of rsvg-convert),
631    // so we need to parse it first.
632    if let Some(style_sheet) = style_sheet {
633        sheet.parse_more(style_sheet);
634    }
635
636    for node in xml.descendants().filter(|n| n.has_tag_name("style")) {
637        match node.attribute("type") {
638            Some("text/css") => {}
639            Some(_) => continue,
640            None => {}
641        }
642
643        let text = match node.text() {
644            Some(v) => v,
645            None => continue,
646        };
647
648        sheet.parse_more(text);
649    }
650
651    sheet
652}
653
654struct XmlNode<'a, 'input: 'a>(roxmltree::Node<'a, 'input>);
655
656impl simplecss::Element for XmlNode<'_, '_> {
657    fn parent_element(&self) -> Option<Self> {
658        self.0.parent_element().map(XmlNode)
659    }
660
661    fn prev_sibling_element(&self) -> Option<Self> {
662        self.0.prev_sibling_element().map(XmlNode)
663    }
664
665    fn has_local_name(&self, local_name: &str) -> bool {
666        self.0.tag_name().name() == local_name
667    }
668
669    fn attribute_matches(&self, local_name: &str, operator: simplecss::AttributeOperator) -> bool {
670        match self.0.attribute(local_name) {
671            Some(value) => operator.matches(value),
672            None => false,
673        }
674    }
675
676    fn pseudo_class_matches(&self, class: simplecss::PseudoClass) -> bool {
677        match class {
678            simplecss::PseudoClass::FirstChild => self.prev_sibling_element().is_none(),
679            // TODO: lang
680            _ => false, // Since we are querying a static SVG we can ignore other pseudo-classes.
681        }
682    }
683}
684
685fn fix_recursive_patterns(doc: &mut Document) {
686    while let Some(node_id) = find_recursive_pattern(AId::Fill, doc) {
687        let idx = doc.get(node_id).attribute_id(AId::Fill).unwrap();
688        doc.attrs[idx].value = roxmltree::StringStorage::Borrowed("none");
689    }
690
691    while let Some(node_id) = find_recursive_pattern(AId::Stroke, doc) {
692        let idx = doc.get(node_id).attribute_id(AId::Stroke).unwrap();
693        doc.attrs[idx].value = roxmltree::StringStorage::Borrowed("none");
694    }
695}
696
697fn find_recursive_pattern(aid: AId, doc: &mut Document) -> Option<NodeId> {
698    for pattern_node in doc
699        .root()
700        .descendants()
701        .filter(|n| n.tag_name() == Some(EId::Pattern))
702    {
703        for node in pattern_node.descendants() {
704            let value = match node.attribute(aid) {
705                Some(v) => v,
706                None => continue,
707            };
708
709            if let Ok(svgtypes::Paint::FuncIRI(link_id, _)) = svgtypes::Paint::from_str(value) {
710                if link_id == pattern_node.element_id() {
711                    // If a pattern child has a link to the pattern itself
712                    // then we have to replace it with `none`.
713                    // Otherwise we will get endless loop/recursion and stack overflow.
714                    return Some(node.id);
715                } else {
716                    // Check that linked node children doesn't link this pattern.
717                    if let Some(linked_node) = doc.element_by_id(link_id) {
718                        for node2 in linked_node.descendants() {
719                            let value2 = match node2.attribute(aid) {
720                                Some(v) => v,
721                                None => continue,
722                            };
723
724                            if let Ok(svgtypes::Paint::FuncIRI(link_id2, _)) =
725                                svgtypes::Paint::from_str(value2)
726                            {
727                                if link_id2 == pattern_node.element_id() {
728                                    return Some(node2.id);
729                                }
730                            }
731                        }
732                    }
733                }
734            }
735        }
736    }
737
738    None
739}
740
741fn fix_recursive_links(eid: EId, aid: AId, doc: &mut Document) {
742    while let Some(node_id) = find_recursive_link(eid, aid, doc) {
743        let idx = doc.get(node_id).attribute_id(aid).unwrap();
744        doc.attrs[idx].value = roxmltree::StringStorage::Borrowed("none");
745    }
746}
747
748fn find_recursive_link(eid: EId, aid: AId, doc: &Document) -> Option<NodeId> {
749    for node in doc
750        .root()
751        .descendants()
752        .filter(|n| n.tag_name() == Some(eid))
753    {
754        for child in node.descendants() {
755            if let Some(link) = child.node_attribute(aid) {
756                if link == node {
757                    // If an element child has a link to the element itself
758                    // then we have to replace it with `none`.
759                    // Otherwise we will get endless loop/recursion and stack overflow.
760                    return Some(child.id);
761                } else {
762                    // Check that linked node children doesn't link this element.
763                    for node2 in link.descendants() {
764                        if let Some(link2) = node2.node_attribute(aid) {
765                            if link2 == node {
766                                return Some(node2.id);
767                            }
768                        }
769                    }
770                }
771            }
772        }
773    }
774
775    None
776}
777
778/// Detects cases like:
779///
780/// ```xml
781/// <filter id="filter1">
782///   <feImage xlink:href="#rect1"/>
783/// </filter>
784/// <rect id="rect1" x="36" y="36" width="120" height="120" fill="green" filter="url(#filter1)"/>
785/// ```
786fn fix_recursive_fe_image(doc: &mut Document) {
787    let mut ids = Vec::new();
788    for fe_node in doc
789        .root()
790        .descendants()
791        .filter(|n| n.tag_name() == Some(EId::FeImage))
792    {
793        if let Some(link) = fe_node.node_attribute(AId::Href) {
794            if let Some(filter_uri) = link.attribute::<&str>(AId::Filter) {
795                let filter_id = fe_node.parent().unwrap().element_id();
796                for func in svgtypes::FilterValueListParser::from(filter_uri).flatten() {
797                    if let svgtypes::FilterValue::Url(url) = func {
798                        if url == filter_id {
799                            ids.push(link.id);
800                        }
801                    }
802                }
803            }
804        }
805    }
806
807    for id in ids {
808        let idx = doc.get(id).attribute_id(AId::Filter).unwrap();
809        doc.attrs[idx].value = roxmltree::StringStorage::Borrowed("none");
810    }
811}
usvg/parser/svgtree/parse.rs

usvg/parser/svgtree/
parse.rs
