semver-analyzer-core

Language-agnostic foundation for the semver-analyzer workspace. Defines shared data types, trait abstractions, the structural diff engine, and concurrent shared state for the TD/BU analysis pipelines.

No language-specific logic lives here. Language crates (e.g., semver-analyzer-ts) depend on this crate and implement its traits.

Key Traits

`Language`

The primary extension point. Language crates implement this to plug into the analysis pipeline. Composes LanguageSemantics + MessageFormatter + Send + Sync + 'static.

pub trait Language: LanguageSemantics + MessageFormatter + Send + Sync + 'static {
    type Category;           // Behavioral change categories (e.g., DOM, CSS, a11y)
    type ManifestChangeType; // Package manifest change types
    type Evidence;           // Evidence data for behavioral changes
    type ReportData;         // Language-specific report data

    const NAME: &'static str;
    const MANIFEST_FILES: &'static [&'static str];
    const SOURCE_FILE_PATTERNS: &'static [&'static str];

    fn extract(&self, repo: &Path, git_ref: &str) -> Result<ApiSurface>;
    fn parse_changed_functions(&self, repo: &Path, from: &str, to: &str) -> Result<Vec<ChangedFunction>>;
    fn find_callers(&self, file: &Path, symbol: &str) -> Result<Vec<Caller>>;
    fn find_tests(&self, repo: &Path, source: &Path) -> Result<Vec<TestFile>>;
    fn diff_test_assertions(&self, repo: &Path, test: &TestFile, from: &str, to: &str) -> Result<TestDiff>;
    fn build_report(results: &AnalysisResult<Self>, repo: &Path, from: &str, to: &str) -> AnalysisReport<Self>;
    // ... and more
}

`LanguageSemantics`

Encodes language-specific breaking-change rules consumed by the diff engine.

Method	Purpose
`is_member_addition_breaking`	Whether adding a member to a container is breaking
`same_family`	Whether two symbols belong to the same logical group
`same_identity`	Whether two symbols represent the same concept at different paths
`visibility_rank`	Numeric visibility rank (higher = more visible)
`parse_union_values`	Parse union/constrained type values for fine-grained diffing
`post_process`	Language-specific post-processing of the change list

`BehaviorAnalyzer`

Language-agnostic LLM-based behavioral analysis interface.

Method	Purpose
`infer_spec`	Infer a function's behavioral spec from its body
`infer_spec_with_test_context`	Infer a spec grounded by test assertion diffs
`specs_are_breaking`	Two-tier comparison (structural then LLM fallback)
`check_propagation`	Check if a caller propagates a behavioral break

Optional Capability Traits

HierarchySemantics -- Component hierarchy inference (React, Vue, etc.)
RenameSemantics -- LLM-based rename pattern detection
BodyAnalysisSemantics -- Deterministic body-level behavioral change detection

Diff Engine

The structural diff engine compares two ApiSurface snapshots and produces StructuralChange entries using language-specific semantic rules.

// With language-specific semantics
let changes = diff_surfaces_with_semantics(&old_surface, &new_surface, &ts_semantics);

// With minimal (language-agnostic) semantics
let changes = diff_surfaces(&old_surface, &new_surface);

The engine runs a 6-phase pipeline:

Relocation detection (moved to deprecated/next)
Rename detection (fingerprint + LCS matching)
Unmatched symbol collection (added/removed)
Matched symbol comparison (signatures, types, visibility, members)
Structural migration detection (interface absorption/decomposition)
Language-specific post-processing

Shared State

SharedFindings<L> provides concurrent coordination between the TD and BU pipelines:

DashMap for structural/behavioral breaks
Broadcast channel for real-time TD-to-BU notifications
OnceCell for API surfaces (BU blocks until TD sets them)

let shared = Arc::new(SharedFindings::<TypeScript>::new());

// TD pipeline sets surfaces and broadcasts breaking changes
shared.set_old_surface(old_surface);
shared.insert_structural_breaks(breaking_changes);

// BU pipeline checks before analyzing each function
if should_skip_for_bu(&shared, &mut receiver, &qualified_name) {
    continue; // Already covered by TD
}

Core Types

API Surface

ApiSurface -- Collection of exported symbols at a git ref
Symbol -- A single exported symbol (name, kind, visibility, signature, members, etc.)
SymbolKind -- Function, Class, Interface, TypeAlias, Enum, Property, etc.
Visibility -- Exported, Public, Protected, Internal, Private
Signature -- Parameters, return type, type parameters, async flag
Parameter -- Name, type, optional/default/variadic flags

Changes

StructuralChange -- Internal diff engine output with full detail
StructuralChangeType -- Added, Removed, Changed, Renamed, Relocated
ChangeSubject -- What aspect changed (Symbol, Member, Parameter, ReturnType, etc.)
BehavioralBreak<L> -- A detected behavioral breaking change with evidence

Reports

AnalysisReport<L> -- Full language-specific analysis report
ReportEnvelope -- Self-describing, language-dispatched report container
AnalysisResult<L> -- Raw pipeline output (input to build_report)

CLI

Shared clap argument structs: CommonAnalyzeArgs, CommonExtractArgs, DiffArgs, CommonKonveyorArgs.

License

Apache-2.0

semver-analyzer-core 0.0.4