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PureXML 0.4.1

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@mihaelamj mihaelamj released this 25 Jun 08:46
· 70 commits to main since this release
v0.4.1
c62e02f
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Learn about vigilant mode.

Post-0.4.0 XPath performance work. Backward compatible, identical query results.

Performance (xpath vs libxml2, 20k-item generated corpus)

~5.5x -> ~1.3x slower than libxml2 across five passes:

  • single-accumulator descendant traversal, replacing per-node array concatenation (#285)
  • fuse the node test into the descendant walk, so a rejected node is never wrapped or reference-counted (#286)
  • the same node-test fusion for the attribute axis (#287)
  • share the focus-independent evaluation state (variables, functions, namespaces, budget) through one Environment reference instead of copying three dictionaries per node (#288)
  • compile the step node test once per query rather than per node, dropping a per-node namespace-dictionary retain on the dominant traversal, the single largest pass (#289)

Verification

Full local suite (1707 tests), Apache Xalan XSLT gold-output corpus, and the WASM cross-platform build, all green across macOS, Linux, and Windows. Each correctness-sensitive change (the three node-test fusions and the compiled node test) is covered by a dedicated differential test asserting the fast path selects exactly what the unfused path does, plus an adversarial equivalence review. swiftformat and swiftlint --strict clean.

Full changelog: https://github.com/mihaelamj/PureXML/blob/main/CHANGELOG.md

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