feat(xslt): implement standalone XSLT engine - #157
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Implement the standalone bounded XSLT 1.0 engine, shared XML input layer, complete pinned interoperability corpus, and the required integration, documentation, CI, and no_std validation paths. Closes #141
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- Preserve RFC URI schemes and logical document cache identities - Track embedded modules by resource fragment - Correct retained-memory accounting before resource processing
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe change adds shared XML input and lexical writing crates, a safe XSLT 1.0 engine, vendored safe DOM/XPath implementations, namespace and decoding limits, XML security adapter updates, compatibility fixtures, and CI/release integration. ChangesXML platform and XSLT engine
Priority: ➖ Normal Estimated code review effort: 5 (Critical) | ~120 minutes Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to The change adds bounded XML and XSLT processing capabilities, including safe DOM namespace visitation behavior. No concrete merge-blocking correctness, security, or runtime risk remains identified. Sequence Diagram(s)sequenceDiagram
participant Caller
participant XmlInput
participant XmlDocument
participant XsltEngine
participant Resolver
participant Serializer
Caller->>XmlInput: decode bounded XML bytes
XmlInput->>XmlDocument: provide normalized XML events
Caller->>XsltEngine: compile and execute stylesheet
XsltEngine->>Resolver: resolve explicit external resources
Resolver-->>XsltEngine: return bounded resource bytes
XsltEngine->>Serializer: serialize transformation result
Serializer-->>Caller: return encoded output
🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (1 warning, 1 inconclusive)
✅ Passed checks (3 passed)
Full details: Linked Issues checkExplanation The changes clearly add the standalone XSLT crate, XPath and XML foundations, budgets, resolver contracts, serialization, EXSLT support, interoperability fixtures, and integration support. The provided summaries do not verify every required XSLT instruction, declaration, and acceptance test from issue [ Resolution Provide implementation and test evidence for all required XSLT 1.0 instructions and declarations, template conflict resolution, result-tree fragments, namespace fixup, whitespace handling, keys, numbering, sorting, serialization behavior, independent crate builds, and required workspace, feature, clippy, unit, integration, and doctest checks.
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Actionable comments posted: 1
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In `@vendor/sxd-document-no-unsafe/src/dom_no_unsafe.rs`:
- Around line 330-337: Update try_visit_element_namespace_declarations in the
safe backend to collect namespace declarations into a temporary snapshot before
invoking callbacks, releasing the storage borrow so visitors may mutate the
document. Align the callback contract and namespace_declaration_workspace_bytes
with the snapshot allocation, and add the equivalent reentrancy test to verify
registration during visitation succeeds.
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| state.charge_owned(new_resolved_identity_retained_bytes(&resolved))?; | ||
| (Arc::new(resolved), true) | ||
| }; | ||
| if !state.module_documents.contains_key(&resource.canonical_uri) { |
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When two include/import requests return distinct ResourceIdentity values but the same canonical_uri, this URI-keyed cache retains only the first semantic document even though both modules are compiled from their respective resource bytes. At execution time the stylesheet-document cache is consequently seeded with only the first tree, so an expression in the second module that calls document('') reads the wrong stylesheet document. The resolver contract identifies provenance through ResourceIdentity and does not require canonical URIs to be unique across returned representations; preserve that identity through the module-document and runtime caches, or reject conflicting canonical-URI mappings explicitly.
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| self.initializing_globals.len().saturating_add(1), | ||
| EXECUTION_RECURSION_DEPTH_CEILING, | ||
| )?; | ||
| self.initializing_globals.push(name.clone()); |
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When globals form a long dependency chain—especially a circular chain with large QNames—each recursive initialization clones the full ExpandedName into this vector without reserving either the vector capacity or the cloned strings against ExecutionBudget::owned_bytes. The cycle diagnostic then performs additional unmetered collection and joining, so an execution whose owned-byte allowance is already exhausted can still allocate up to the compile-budget-sized names before returning a dynamic error. Reserve and release stack capacity and name storage through the execution meter, and construct the diagnostic within the same bound.
AGENTS.md reference: AGENTS.md:L30-L33
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| name: name.clone(), | ||
| prefix: prefix.clone(), | ||
| attributes: Vec::new(), | ||
| namespaces: namespaces.clone(), |
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When xsl:copy processes an element with large in-scope namespace bindings, namespaces is an Arc<Vec<Namespace>>, so this clone only increments the reference count and does not allocate another namespace vector or duplicate its strings. Nevertheless, copied_bytes includes all namespace strings and push_node_with_base subsequently charges the vector and those strings through node_kind_owned_bytes, causing ExecutionBudget::owned_bytes to reject transformations whose actual live allocations fit the limit. Charge only the newly cloned name and prefix here, or materialize an actual independently metered namespace copy.
AGENTS.md reference: AGENTS.md:L30-L33
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Summary
quick-xmlpaths with shared bounded XML input handlingValidation
cargo nextest run --workspace --all-features(3037 passed)cargo test --workspace --all-features --doc(15 passed)cargo clippy --workspace --all-targets --all-features -- -D warningscargo build --workspace --all-featurescargo check --workspace --all-targets --all-featuresthumbv7em-none-eabihfchecksCloses #141
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