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{"type":"item.completed","item":{"id":"item_0","type":"agent_message","text":"=== BEGIN ARTIFACT ARCHITECTURE.md ===\n# ARCHITECTURE: jq\n\n| Field | Value |\n|-------------|-------|\n| Version | 20260822 V1 |\n| Description | Modular standard-library Python architecture for a standalone jq interpreter. |\n| Depends On | — |\n| Provides | interpreter architecture, executable boundary, generator evaluation model |\n| Consumes | — |\n\n## Questions\n\n- None.\n\n## Architecture\n\nThe implementation is a modular Python executable named `jq` at the application root. The process boundary parses `-c '<program>'`, reads JSON values from standard input, evaluates the parsed filter as an ordered generator, and serializes each produced value as one compact JSON value per output line.\n\nThe implementation is divided into:\n\n- CLI and process boundary: argument validation, input framing, output serialization, diagnostics, and exit codes.\n- Lexer and parser: jq tokenization, precedence, syntax validation, and AST construction.\n- Value model: JSON values, numeric literals, NaN, infinities, immutable update helpers, and structural comparison.\n- Evaluator: generator execution, lexical environments, function calls, backtracking, errors, labels, and reductions.\n- Builtins: accessors, operators, collections, strings, regular expressions, dates, paths, assignments, I/O, and streaming.\n\nValues are treated immutably at jq-language boundaries. Filters yield zero or more values; downstream filters execute once for every upstream value, preserving order and multiplicity.\n\n### Module ownership\n\n| Boundary | Owner | Responsibility |\n|---|---|---|\n| CLI and process execution | executable entry point | `-c`, stdin, stdout, stderr, exit status |\n| Lexical analysis | lexer module | tokens, comments, literals, interpolation states |\n| Syntax | parser module | AST and compile errors |\n| Runtime values | value module | JSON-compatible values and numeric behavior |\n| Evaluation | evaluator module | streams, environments, control flow, errors |\n| Builtins | builtin modules | jq primitives and standard-library definitions |\n| Paths and mutation | path module | path discovery and immutable updates |\n| Conformance | staged `sources/` assets | corpus execution and scoring |\n\nNo system `jq`, third-party jq implementation, package installation, network access, or external runtime dependency is permitted.\n\n## Technology Stack\n\n- Python 3.11 or newer, using only the standard library.\n- POSIX `sh` for the supplied scoring entry point.\n\n## Programmatic Acceptance\n\n=== AC architecture-boundary ===\nIntent: The implementation exposes the declared executable boundary and remains runnable with the standard-library runtime.\n\nfrom pathlib import Path\nimport os\nimport subprocess\nimport sys\n\nexecutable = Path(\"jq\")\nassert executable.is_file()\nassert os.access(executable, os.X_OK)\n\nresult = subprocess.run(\n [sys.executable, \"-c\", \"import json, decimal, math, re, datetime, time\"],\n capture_output=True,\n text=True,\n)\nassert result.returncode == 0\n=== END AC architecture-boundary ===\n\n=== AC architecture-conformance-start ===\nIntent: The staged conformance assets can be imported and parsed from the declared architecture boundary.\n\nimport sys\n\nsys.path.insert(0, \"sources\")\nimport run_conformance as harness\n\ncases = harness.parse_corpus(harness.CORPUS.read_text(encoding=\"utf-8\"))\nexcluded = harness.apply_exclusions(\n cases, harness.parse_exclusions(harness.EXCLUSIONS)\n)\nassert cases\nassert excluded\n=== END AC architecture-conformance-start ===\n\n## User Acceptance\n\n- None.\n\n## Guardrails\n\n- Do not shell out to a system `jq`.\n- Do not use a third-party jq implementation or binding.\n- Preserve generator ordering, multiplicity, backtracking, and immutable value semantics.\n- Keep staged scoring assets unchanged.\n=== END ARTIFACT ===\n=== BEGIN ARTIFACT FEATURE-Executable-Entry-Point.md ===\n# FEATURE: Executable Entry Point\n\n| Field | Value |\n|-------------|-------|\n| Version | 20260822 V1 |\n| Description | Provides the executable jq command-line entry point for compact filter execution. |\n| Depends On | ARCHITECTURE.md, FEATURE-Conformance-Asset-Staging.md |\n| Provides | executable jq, -c filter invocation |\n| Consumes | interpreter architecture, JSON input stream |\n\n## Questions\n\n- None.\n\n## Intent\n\nThe application root contains an executable named `jq`. It accepts the exercised `-c '<program>'` interface, reads JSON values from standard input, evaluates the filter, and emits every generated result as a compact JSON value on its own output line.\n\nThe entry point is self-contained within the modular Python implementation and does not require installation or environment configuration beyond the standard Python runtime.\n\n## Programmatic Acceptance\n\n=== AC executable-basic-filters ===\nIntent: The executable accepts the required -c interface and executes the basic corpus slice.\n\nimport json\nimport os\nimport subprocess\nimport sys\n\nresult = subprocess.run(\n [sys.executable, \"sources/run_conformance.py\", \"--select\", r\"^(true|false|null|1)$\", \"--json\"],\n capture_output=True,\n text=True,\n env={**os.environ, \"JQ\": f\"{os.getcwd()}/jq\"},\n)\nprint(result.stdout)\nprint(result.stderr, file=sys.stderr)\nreport = json.loads(result.stdout)\nsummary = report[\"summary\"]\nassert sum(summary.values()) > 0\nassert summary[\"fail\"] == 0 and summary[\"error\"] == 0\nassert result.returncode == 0\n=== END AC executable-basic-filters ===\n\n=== AC executable-stdin-output ===\nIntent: The executable reads JSON from stdin and emits one result for each generated output.\n\nimport json\nimport subprocess\n\npayload = \"[1,2,3]\\n\"\nresult = subprocess.run(\n [\"./jq\", \"-c\", \".[]\"],\n input=payload,\n capture_output=True,\n text=True,\n)\nprint(result.stdout)\nprint(result.stderr, file=__import__(\"sys\").stderr)\nassert result.returncode == 0\nactual = [json.loads(line) for line in result.stdout.splitlines()]\nexpected = json.loads(payload)\nassert actual == expected\n=== END AC executable-stdin-output ===\n\n## User Acceptance\n\n- None.\n\n## Guardrails\n\n- The executable must be named exactly `jq` and be executable at the application root.\n- Only the exercised `-c` interface is required.\n- Output must remain one compact JSON value per line.\n=== END ARTIFACT ===\n=== BEGIN ARTIFACT FEATURE-Process-Contract.md ===\n# FEATURE: Process Contract\n\n| Field | Value |\n|-------------|-------|\n| Version | 20260822 V1 |\n| Description | Defines jq compilation, runtime failure, success, and diagnostic process behavior. |\n| Depends On | FEATURE-Executable-Entry-Point.md, FEATURE-Declarations-And-Control-Syntax.md, FEATURE-Errors-And-Optional-Evaluation.md |\n| Provides | compile exit 3, runtime exit 5, success exit 0, stderr diagnostics |\n| Consumes | executable jq, parser, evaluator |\n\n## Questions\n\n- None.\n\n## Intent\n\nThe process distinguishes compilation failures from runtime failures:\n\n- Exit `0` means compilation and execution completed.\n- Exit `3` means the filter was rejected before execution.\n- Exit `5` means execution raised a runtime error.\n- Diagnostics are written to standard error.\n- Values produced before a runtime error remain on standard output.\n\n## Programmatic Acceptance\n\n=== AC compile-exit-status ===\nIntent: Invalid jq syntax is rejected with compile exit status 3.\n\nimport subprocess\n\nresult = subprocess.run(\n [\"./jq\", \"-c\", \"{\"],\n input=\"null\\n\",\n capture_output=True,\n text=True,\n)\nprint(result.stdout)\nprint(result.stderr, file=__import__(\"sys\").stderr)\nassert result.returncode == 3\n=== END AC compile-exit-status ===\n\n=== AC runtime-exit-status ===\nIntent: A compiled filter that raises at runtime exits 5 and keeps diagnostics off stdout.\n\nimport subprocess\n\nresult = subprocess.run(\n [\"./jq\", \"-c\", \"error\"],\n input=\"null\\n\",\n capture_output=True,\n text=True,\n)\nprint(result.stdout)\nprint(result.stderr, file=__import__(\"sys\").stderr)\nassert result.returncode == 5\nassert result.stderr != \"\"\nassert result.stdout == \"\"\n=== END AC runtime-exit-status ===\n\n=== AC partial-runtime-output ===\nIntent: Values emitted before a runtime error remain available on stdout.\n\nimport subprocess\n\nresult = subprocess.run(\n [\"./jq\", \"-c\", \"1, error\"],\n input=\"null\\n\",\n capture_output=True,\n text=True,\n)\nprint(result.stdout)\nprint(result.stderr, file=__import__(\"sys\").stderr)\nassert result.returncode == 5\nassert result.stdout.splitlines() == [\"1\"]\n=== END AC partial-runtime-output ===\n\n## User Acceptance\n\n- None.\n\n## Guardrails\n\n- Compile failures must remain distinct from runtime failures.\n- Runtime diagnostics must never be emitted as JSON output.\n- Partial output before a runtime failure must not be discarded.\n=== END ARTIFACT ===\n=== BEGIN ARTIFACT FEATURE-JSON-IO-Boundary.md ===\n# FEATURE: JSON I/O Boundary\n\n| Field | Value |\n|-------------|-------|\n| Version | 20260822 V1 |\n| Description | Handles JSON input decoding and compact serialization of jq output values. |\n| Depends On | ARCHITECTURE.md, FEATURE-Executable-Entry-Point.md, FEATURE-Value-Model.md |\n| Provides | JSON stdin decoding, compact JSON line serialization, Unicode and special-number handling |\n| Consumes | executable jq, JSON value model |\n\n## Questions\n\n- None.\n\n## Intent\n\nThe process accepts the JSON values supplied by the conformance harness on standard input. Every value generated by the filter is serialized compactly and independently on one output line. Ordering and multiplicity are preserved. Unicode strings and jq numeric values, including NaN and infinities where the corpus requires them, use the representation expected by the harness.\n\n## Programmatic Acceptance\n\n=== AC json-stream-boundary ===\nIntent: Multiple JSON input values are decoded and emitted in generator order.\n\nimport json\nimport subprocess\n\npayload = \"1\\n2\\n3\\n\"\nresult = subprocess.run(\n [\"./jq\", \"-c\", \".\"],\n input=payload,\n capture_output=True,\n text=True,\n)\nprint(result.stdout)\nprint(result.stderr, file=__import__(\"sys\").stderr)\nassert result.returncode == 0\nactual = [json.loads(line) for line in result.stdout.splitlines()]\nexpected = [json.loads(line) for line in payload.splitlines()]\nassert actual == expected\n=== END AC json-stream-boundary ===\n\n=== AC json-compact-unicode ===\nIntent: Compact JSON serialization preserves supplied Unicode input as a JSON value.\n\nimport json\nimport subprocess\n\nvalue = \"Unicode \\u03bc\"\npayload = json.dumps(value, ensure_ascii=False) + \"\\n\"\nresult = subprocess.run(\n [\"./jq\", \"-c\", \".\"],\n input=payload,\n capture_output=True,\n text=True,\n)\nprint(result.stdout)\nprint(result.stderr, file=__import__(\"sys\").stderr)\nassert result.returncode == 0\nassert json.loads(result.stdout) == value\nassert \"\\n\" not in result.stdout.rstrip(\"\\n\")\n=== END AC json-compact-unicode ===\n\n=== AC json-special-numbers ===\nIntent: The JSON boundary executes the authoritative numeric-value slice without failures.\n\nimport json\nimport os\nimport subprocess\nimport sys\n\nresult = subprocess.run(\n [sys.executable, \"sources/run_conformance.py\", \"--select\", r\"nan|infinite|tojson|fromjson\", \"--json\"],\n capture_output=True,\n text=True,\n env={**os.environ, \"JQ\": f\"{os.getcwd()}/jq\"},\n)\nprint(result.stdout)\nprint(result.stderr, file=sys.stderr)\nreport = json.loads(result.stdout)\nsummary = report[\"summary\"]\nassert sum(summary.values()) > 0\nassert summary[\"fail\"] == 0 and summary[\"error\"] == 0\nassert result.returncode == 0\n=== END AC json-special-numbers ===\n\n## User Acceptance\n\n- None.\n\n## Guardrails\n\n- Emit one compact JSON value per output line.\n- Preserve output order and multiplicity.\n- Do not use text formatting as a substitute for structural JSON values.\n- Preserve Unicode and the numeric behaviors required by the supplied corpus.\n=== END ARTIFACT ===\n=== BEGIN ARTIFACT FEATURE-Lexer.md ===\n# FEATURE: Lexer\n\n| Field | Value |\n|-------------|-------|\n| Version | 20260822 V1 |\n| Description | Tokenizes jq programs according to the supplied lexical specification. |\n| Depends On | ARCHITECTURE.md |\n| Provides | jq tokens, comments, delimiters, identifiers, literals, bindings |\n| Consumes | interpreter architecture |\n\n## Questions\n\n- None.\n\n## Intent\n\nThe lexer recognizes jq keywords, identifiers, field selectors, variable bindings, literals, operators, comments, delimiters, format tokens, and string/interpolation state transitions. Comments are ignored without altering adjacent program structure. Invalid characters and malformed literals are reported as compile failures.\n\n## Programmatic Acceptance\n\n=== AC lexer-basic-syntax ===\nIntent: The authoritative lexer-focused corpus slice executes successfully.\n\nimport json\nimport os\nimport subprocess\nimport sys\n\nresult = subprocess.run(\n [sys.executable, \"sources/run_conformance.py\", \"--select\", r\"^(true|false|null|1|\\.)$\", \"--json\"],\n capture_output=True,\n text=True,\n env={**os.environ, \"JQ\": f\"{os.getcwd()}/jq\"},\n)\nprint(result.stdout)\nprint(result.stderr, file=sys.stderr)\nreport = json.loads(result.stdout)\nsummary = report[\"summary\"]\nassert sum(summary.values()) > 0\nassert summary[\"fail\"] == 0 and summary[\"error\"] == 0\nassert result.returncode == 0\n=== END AC lexer-basic-syntax ===\n\n=== AC lexer-comments ===\nIntent: Comments are ignored while the surrounding filter remains executable.\n\nimport subprocess\n\nresult = subprocess.run(\n [\"./jq\", \"-c\", \"1 # comment\\n, 2\"],\n input=\"null\\n\",\n capture_output=True,\n text=True,\n)\nprint(result.stdout)\nprint(result.stderr, file=__import__(\"sys\").stderr)\nassert result.returncode == 0\nassert result.stdout.splitlines() == [\"1\", \"2\"]\n=== END AC lexer-comments ===\n\n=== AC lexer-invalid-token ===\nIntent: Invalid lexical input is rejected as a compile failure.\n\nimport subprocess\n\nresult = subprocess.run(\n [\"./jq\", \"-c\", \"%::wat\"],\n input=\"null\\n\",\n capture_output=True,\n text=True,\n)\nprint(result.stdout)\nprint(result.stderr, file=__import__(\"sys\").stderr)\nassert result.returncode == 3\n=== END AC lexer-invalid-token ===\n\n## User Acceptance\n\n- None.\n\n## Guardrails\n\n- Follow `sources/lexer.l` for token boundaries and lexical states.\n- Do not silently reinterpret invalid escapes or characters.\n- Preserve comments, delimiters, bindings, and interpolation distinctions for the parser.\n=== END ARTIFACT ==="}}
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