Does Obsidian or Codemirror optimizes render of invisible parts?

coffeedevonne · July 27, 2024, 10:54am

I’m trying to filter blocks by their types using a method from the API reference example

syntaxTree(editorView.state).iterate({
  from: range.from,
  to: range.to,
  enter: (node) => {
    // some manipulations with this field
    // node.type.name
  },
}));

But in a big document I’m getting different results depending on a scroll position. So I can’t reliably identify block types with this recommended method.
Why results differ, and how to deal with it?

ush · July 27, 2024, 12:42pm

The short answer is yes; codemirror does that.
The codemirror docs (which you should consult whenever having trouble with codemirror) mentions the ensureSyntaxTree function:

https://codemirror.net/docs/ref/#language.ensureSyntaxTree

Usage example:

github.com

RyotaUshio/obsidian-latex-theorem-equation-referencer/blob/978f8dc28459fb8c96bf5b732c0f0fa301e2eeea/src/theorem-callouts/state-field.ts#L68


      
                      filter: () => false,
                      filterFrom: minChangedPosition,
                  });
              }
          });
          
          
          function getTheoremCalloutInfos(plugin: LatexReferencer, state: EditorState, doc: Text, from: number, init: number): Range<TheoremCalloutInfo>[] {
              const ranges: Range<TheoremCalloutInfo>[] = [];
              // syntaxTree returns a potentially imcomplete tree (limited by viewport), so we need to ensure it's complete
              const tree = ensureSyntaxTree(state, doc.length) ?? syntaxTree(state);
          
              let theoremIndex = init; // incremented when a auto-numbered theorem is found
          
              tree.iterate({
                  from, to: doc.length,
                  enter(node) {
                      if (node.name === 'Document') return; // skip the node for the entire document
          
                      if (node.node.parent?.name !== 'Document') return false; // skip sub-nodes of a line

system · October 25, 2024, 12:42pm

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