V0.4.0/dsl foundation#122
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New files:
- lib/ex_datalog/schema.ex — ExDatalog.Schema macro module + ExDatalog.UnsupportedFeature struct
- test/ex_datalog/schema_test.exs — 23 integration tests
Key features implemented:
- relation/2 macro — declare typed relations
- fact/1 and facts/2 macros — declare ground facts
- rule/2 macro — declare rules with lowercase vars, not_ negation, named constraints (gt, eq, add, etc.)
- query/2 macro — declare named post-materialization queries with find/where
- __before_compile__ generates program/0, materialize/0,1, queries/0, query/2
- Aggregate syntax (agg) parsed but returns %UnsupportedFeature{feature: :aggregates}
Convention: Uppercase identifiers (X, Y) in rule/query bodies are logic variables. Lowercase atoms and atoms starting with : are constants. _ is wildcard.
Results: 741 tests (718 existing + 23 new), 0 failures, credo clean.
Add Ecto-inspired macro DSL (use ExDatalog.Schema) with relation, fact, facts, rule, query, and wildcard macros that compile into the existing Program/Rule/Fact/Constraint/Knowledge builder APIs. Generated functions: program/0, materialize/0,1, queries/0, query/2 New modules: - ExDatalog.Schema — macro module with __before_compile__ - ExDatalog.DSL.CompileError — readable compile-time errors - ExDatalog.UnsupportedFeature — forward-compatible aggregate stub DSL features: - relation/2: typed field schemas (:atom, :integer, :string, :any) - fact/1, facts/2: single and bulk fact declaration - rule/2: lowercase vars, :atom constants, _/wildcard(), not_ negation, 16 named constraint predicates (gt, eq, add, member, etc.) - query/2: post-materialization queries with find/where and projection - Compile-time validation: undefined relations, unsafe variables, arity mismatches with descriptive error messages - Aggregate syntax parsed but not executable (returns UnsupportedFeature) Documentation: - README updated with DSL quickstart - docs/migration_dsl.md — builder API → DSL migration guide - docs/articles/ — 5 educational articles - livebooks/ex_datalog_dsl.livemd — interactive tutorial - CHANGELOG.md — v0.4.0 entry - mix.exs — extras for livebooks, articles, migration guide; DSL module group
…e before the Enum.each(constraint_ops, ...) expansion, since Elixir matches function clauses in definition order and the expanded constraint ops all match {atom(), _, list()} which would shadow {:agg, _, list}.
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v0.4.0: Schema DSL for declaring Datalog programs
Add Ecto-inspired macro DSL (use ExDatalog.Schema) with relation,
fact, facts, rule, query, and wildcard macros that compile into the
existing Program/Rule/Fact/Constraint/Knowledge builder APIs.
Generated functions: program/0, materialize/0,1, queries/0, query/2
New modules:
DSL features:
16 named constraint predicates (gt, eq, add, member, etc.)
arity mismatches with descriptive error messages
Documentation:
Tests: 786 total (718 existing + 68 new), 93.5% coverage, 0 failures.
Quality: mix format, compile --warnings-as-errors, credo --strict,
dialyzer, mix docs all clean. No breaking changes