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https://github.com/storytold/designcraft.git
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noah1400
1bddba0e75
The cross-reference index composed its destination stories through the cache. One with a running header asked for the running-header index, which composed the story holding the cross-reference, which asked for the cross-reference index again: the stack overflowed and the app aborted. Destination stories with a running header are now composed without it, like those with cross-references already were.
77 lines
2.9 KiB
Rust
77 lines
2.9 KiB
Rust
//! Cross-reference resolution: the page each text anchor lands on (from composition) and the
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//! generated text of each cross-reference.
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use std::collections::HashMap;
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use std::sync::Arc;
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use designcraft_doc::{Document, Story, StoryId, XREF_MARK, xref};
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use crate::ComposedStory;
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/// Page name of every text anchor in the document.
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#[derive(Debug, Default)]
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pub struct XrefIndex {
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pages: HashMap<u64, (usize, String)>,
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}
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pub fn has_xrefs(st: &Story) -> bool {
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!st.xrefs.is_empty()
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}
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impl XrefIndex {
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/// `get` composes a story (normally through the cache). Stories that hold cross-references or
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/// running headers are composed without resolving them (their anchors' pages hardly move):
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/// through the cache they would build this index again, directly or by way of the running-header index.
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pub fn build(doc: &Document, get: &dyn Fn(StoryId) -> Arc<ComposedStory>) -> XrefIndex {
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let mut pages = HashMap::new();
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for (sid, st) in &doc.stories {
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if st.anchors.is_empty() {
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continue;
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}
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let indexed = has_xrefs(st) || crate::vars::has_running(doc, st);
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let cs = if indexed { Arc::new(crate::compose_story(doc, *sid, &Default::default())) } else { get(*sid) };
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for a in &st.anchors {
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let Some(pos) = st.anchor_pos(a.id) else { continue };
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if let Some((page, ..)) = crate::vars::place(doc, &cs, pos) {
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pages.insert(a.id, (page, doc.page_name(page)));
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}
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}
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}
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XrefIndex { pages }
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}
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/// Page name of an anchor.
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pub fn page(&self, anchor: u64) -> Option<&str> {
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self.pages.get(&anchor).map(|p| p.1.as_str())
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}
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/// Absolute page index of an anchor.
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pub fn page_index(&self, anchor: u64) -> Option<usize> {
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self.pages.get(&anchor).map(|p| p.0)
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}
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}
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/// The text a cross-reference shows ("??" when its destination is gone, like an unresolved
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/// reference in typesetting).
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pub fn xref_text(doc: &Document, x: &xref::CrossRef, index: Option<&XrefIndex>) -> String {
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let Some(mut v) = doc.xref_values(x.target) else { return "??".into() };
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v.page = index.and_then(|i| i.page(x.target)).unwrap_or("?").to_string();
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let def = doc.xref_format(&x.format).map_or("<fullPara />", |f| f.definition.as_str());
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xref::expand(def, &v)
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}
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/// Generated text of the cross-references in `range` of `story`, by byte of their mark.
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pub fn texts_in(doc: &Document, story: &Story, range: std::ops::Range<usize>, index: Option<&XrefIndex>) -> HashMap<usize, String> {
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let mut out = HashMap::new();
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if story.xrefs.is_empty() {
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return out;
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}
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let before = story.text[..range.start].matches(XREF_MARK).count();
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for (k, (i, _)) in story.text[range.clone()].match_indices(XREF_MARK).enumerate() {
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if let Some(x) = story.xrefs.get(before + k) {
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out.insert(range.start + i, xref_text(doc, x, index));
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}
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}
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out
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}
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