=== BEGIN ARTIFACT FEATURE-Literals-and-Strings.md ===
# FEATURE: Literals and Strings

| Field       | Value |
|-------------|-------|
| Version     | 20260822 V1 |
| Description | Parse jq literals, escaped strings, formatted strings, and interpolation. |
| Depends On  | FEATURE-Lexer.md |
| Provides    | jq string and literal expressions |
| Consumes    | jq tokenization |

## Questions

- None.

## Scope

This feature parses JSON literals, Unicode and escaped string content, format expressions, and `\(expression)` interpolation. Invalid escapes and malformed interpolations are compile errors.

## Programmatic Acceptance

=== AC parse-002-conformance ===
Intent: The literal and string implementation passes the authoritative corpus slice selected by interpolation and format syntax.
Suite: scoped
Requires: executable=python3; scope=test

import json
import os
import subprocess
import sys

selector = r"interpolation|@base64|@uri"
result = subprocess.run(
    [sys.executable, "sources/run_conformance.py", "--select", selector, "--json"],
    capture_output=True,
    text=True,
    env={**os.environ, "JQ": f"{os.getcwd()}/jq"},
)
print(result.stdout)
print(result.stderr, file=sys.stderr)
report = json.loads(result.stdout)
summary = report["summary"]
assert sum(summary.values()) > 0
assert summary["fail"] == 0 and summary["error"] == 0
assert result.returncode == 0
=== END AC parse-002-conformance ===

=== AC parse-002-escapes ===
Intent: Invalid string escapes are rejected as compile failures by the authoritative corpus.
Suite: scoped
Requires: executable=python3; scope=test

import json
import os
import subprocess
import sys

selector = r"@base64|@uri|interpolation|Invalid escape"
result = subprocess.run(
    [sys.executable, "sources/run_conformance.py", "--select", selector, "--json"],
    capture_output=True,
    text=True,
    env={**os.environ, "JQ": f"{os.getcwd()}/jq"},
)
print(result.stdout)
print(result.stderr, file=sys.stderr)
report = json.loads(result.stdout)
summary = report["summary"]
assert sum(summary.values()) > 0
assert summary["fail"] == 0 and summary["error"] == 0
assert result.returncode == 0
=== END AC parse-002-escapes ===

## User Acceptance

- None.

## Guardrails

- Use only standard-library parsing and evaluation.
- Preserve Unicode code points and jq interpolation stream behavior.
=== END ARTIFACT ===
=== BEGIN ARTIFACT FEATURE-Filter-Grammar.md ===
# FEATURE: Filter Grammar

| Field       | Value |
|-------------|-------|
| Version     | 20260822 V1 |
| Description | Parse jq filter expressions with precedence, composition, indexing, construction, and optional operators. |
| Depends On  | FEATURE-Literals-and-Strings.md |
| Provides    | jq filter AST |
| Consumes    | jq string and literal expressions |

## Questions

- None.

## Scope

This feature implements the core expression grammar: pipes, commas, precedence, indexing, slicing, iteration, arrays, objects, unary and binary operators, parentheses, and optional expressions.

## Programmatic Acceptance

=== AC parse-003-conformance ===
Intent: The core expression grammar passes the authoritative corpus slice covering access, construction, operators, and composition syntax.
Suite: scoped
Requires: executable=python3; scope=test

import json
import os
import subprocess
import sys

selector = r"\.|\[|\{|\+|\-|\*|/|%"
result = subprocess.run(
    [sys.executable, "sources/run_conformance.py", "--select", selector, "--json"],
    capture_output=True,
    text=True,
    env={**os.environ, "JQ": f"{os.getcwd()}/jq"},
)
print(result.stdout)
print(result.stderr, file=sys.stderr)
report = json.loads(result.stdout)
summary = report["summary"]
assert sum(summary.values()) > 0
assert summary["fail"] == 0 and summary["error"] == 0
assert result.returncode == 0
=== END AC parse-003-conformance ===

=== AC parse-003-optional ===
Intent: Optional access and slicing syntax executes successfully across the authoritative grammar slice.
Suite: scoped
Requires: executable=python3; scope=test

import json
import os
import subprocess
import sys

selector = r"\?|\[.*:|\{\."
result = subprocess.run(
    [sys.executable, "sources/run_conformance.py", "--select", selector, "--json"],
    capture_output=True,
    text=True,
    env={**os.environ, "JQ": f"{os.getcwd()}/jq"},
)
print(result.stdout)
print(result.stderr, file=sys.stderr)
report = json.loads(result.stdout)
summary = report["summary"]
assert sum(summary.values()) > 0
assert summary["fail"] == 0 and summary["error"] == 0
assert result.returncode == 0
=== END AC parse-003-optional ===

## User Acceptance

- None.

## Guardrails

- Follow the supplied parser precedence and associativity.
- Preserve generator-producing syntax rather than collapsing expressions to scalar functions.
=== END ARTIFACT ===
=== BEGIN ARTIFACT FEATURE-Advanced-Grammar.md ===
# FEATURE: Advanced Grammar

| Field       | Value |
|-------------|-------|
| Version     | 20260822 V1 |
| Description | Parse jq declarations, control constructs, bindings, modules, and destructuring syntax. |
| Depends On  | FEATURE-Filter-Grammar.md |
| Provides    | declarations and control-flow AST forms |
| Consumes    | jq filter AST |

## Questions

- None.

## Scope

This feature parses function definitions, imports and modules, conditionals, try/catch, reductions, foreach, labels, bindings, destructuring, and grammar rejection cases. Module-loader fixtures are not required.

## Programmatic Acceptance

=== AC parse-004-conformance ===
Intent: Declarations and control syntax pass the authoritative corpus slice selected by their concrete jq syntax.
Suite: scoped
Requires: executable=python3; scope=test

import json
import os
import subprocess
import sys

selector = r"%%FAIL|if |try |reduce |foreach |def | as |label |module|include"
result = subprocess.run(
    [sys.executable, "sources/run_conformance.py", "--select", selector, "--json"],
    capture_output=True,
    text=True,
    env={**os.environ, "JQ": f"{os.getcwd()}/jq"},
)
print(result.stdout)
print(result.stderr, file=sys.stderr)
report = json.loads(result.stdout)
summary = report["summary"]
assert sum(summary.values()) > 0
assert summary["fail"] == 0 and summary["error"] == 0
assert result.returncode == 0
=== END AC parse-004-conformance ===

=== AC parse-004-module-rejection ===
Intent: Invalid module metadata, imports, and unbound grammar forms are rejected with compile status 3.
Suite: scoped
Requires: executable=python3; scope=test

import json
import os
import subprocess
import sys

selector = r"module|include|%::wat|break"
result = subprocess.run(
    [sys.executable, "sources/run_conformance.py", "--select", selector, "--json"],
    capture_output=True,
    text=True,
    env={**os.environ, "JQ": f"{os.getcwd()}/jq"},
)
print(result.stdout)
print(result.stderr, file=sys.stderr)
report = json.loads(result.stdout)
summary = report["summary"]
assert sum(summary.values()) > 0
assert summary["fail"] == 0 and summary["error"] == 0
assert result.returncode == 0
=== END AC parse-004-module-rejection ===

## User Acceptance

- None.

## Guardrails

- Reject invalid module grammar without reading excluded module fixtures.
- Keep compile failures distinct from runtime failures.
=== END ARTIFACT ===
=== BEGIN ARTIFACT FEATURE-Generator-Core.md ===
# FEATURE: Generator Core

| Field       | Value |
|-------------|-------|
| Version     | 20260822 V1 |
| Description | Evaluate jq filters as ordered streams with multiplicity, backtracking, and empty results. |
| Depends On  | FEATURE-Advanced-Grammar.md |
| Provides    | ordered jq generator evaluation |
| Consumes    | jq filter AST |

## Questions

- None.

## Scope

Every filter evaluates against an input and produces zero or more ordered outputs. The evaluator preserves stream order, multiplicity, backtracking, and partial results before runtime failure.

## Programmatic Acceptance

=== AC core-001-conformance ===
Intent: The generator evaluator passes the authoritative corpus slice covering identity, iteration, ranges, commas, and empty.
Suite: scoped
Requires: executable=python3; scope=test

import json
import os
import subprocess
import sys

selector = r"\.|,|\[\.\]|range|empty"
result = subprocess.run(
    [sys.executable, "sources/run_conformance.py", "--select", selector, "--json"],
    capture_output=True,
    text=True,
    env={**os.environ, "JQ": f"{os.getcwd()}/jq"},
)
print(result.stdout)
print(result.stderr, file=sys.stderr)
report = json.loads(result.stdout)
summary = report["summary"]
assert sum(summary.values()) > 0
assert summary["fail"] == 0 and summary["error"] == 0
assert result.returncode == 0
=== END AC core-001-conformance ===

=== AC core-001-ordering ===
Intent: Multi-output generator ordering and multiplicity pass the authoritative corpus cases selected by comma and iteration syntax.
Suite: scoped
Requires: executable=python3; scope=test

import json
import os
import subprocess
import sys

selector = r",|\[\]|\.\[\]"
result = subprocess.run(
    [sys.executable, "sources/run_conformance.py", "--select", selector, "--json"],
    capture_output=True,
    text=True,
    env={**os.environ, "JQ": f"{os.getcwd()}/jq"},
)
print(result.stdout)
print(result.stderr, file=sys.stderr)
report = json.loads(result.stdout)
summary = report["summary"]
assert sum(summary.values()) > 0
assert summary["fail"] == 0 and summary["error"] == 0
assert result.returncode == 0
=== END AC core-001-ordering ===

## User Acceptance

- None.

## Guardrails

- Do not replace generators with single-value functions.
- Preserve outputs emitted before a later runtime error.
=== END ARTIFACT ===
=== BEGIN ARTIFACT FEATURE-Composition.md ===
# FEATURE: Composition

| Field       | Value |
|-------------|-------|
| Version     | 20260822 V1 |
| Description | Implement jq composition, collection, object construction, and cartesian stream semantics. |
| Depends On  | FEATURE-Generator-Core.md |
| Provides    | pipe, comma, collection, object, and cartesian semantics |
| Consumes    | ordered jq generator evaluation |

## Questions

- None.

## Scope

This feature composes generator filters through pipes and commas, collects streams into arrays, constructs objects with generator-valued fields, and evaluates filter arguments as cartesian products while preserving order.

## Programmatic Acceptance

=== AC core-002-conformance ===
Intent: Composition and cartesian evaluation pass the authoritative corpus slice selected by pipe, comma, collection, and object syntax.
Suite: scoped
Requires: executable=python3; scope=test

import json
import os
import subprocess
import sys

selector = r"\||,|\[|\{"
result = subprocess.run(
    [sys.executable, "sources/run_conformance.py", "--select", selector, "--json"],
    capture_output=True,
    text=True,
    env={**os.environ, "JQ": f"{os.getcwd()}/jq"},
)
print(result.stdout)
print(result.stderr, file=sys.stderr)
report = json.loads(result.stdout)
summary = report["summary"]
assert sum(summary.values()) > 0
assert summary["fail"] == 0 and summary["error"] == 0
assert result.returncode == 0
=== END AC core-002-conformance ===

=== AC core-002-cartesian ===
Intent: Multi-output arguments and constructed values preserve the authoritative corpus ordering and multiplicity.
Suite: scoped
Requires: executable=python3; scope=test

import json
import os
import subprocess
import sys

selector = r"range\(0,1|range\(0;1|x: \(1,2\)|\[\.\["
result = subprocess.run(
    [sys.executable, "sources/run_conformance.py", "--select", selector, "--json"],
    capture_output=True,
    text=True,
    env={**os.environ, "JQ": f"{os.getcwd()}/jq"},
)
print(result.stdout)
print(result.stderr, file=sys.stderr)
report = json.loads(result.stdout)
summary = report["summary"]
assert sum(summary.values()) > 0
assert summary["fail"] == 0 and summary["error"] == 0
assert result.returncode == 0
=== END AC core-002-cartesian ===

## User Acceptance

- None.

## Guardrails

- Preserve left-to-right generator ordering.
- Evaluate each filter argument against the correct input and retain full cartesian multiplicity.
=== END ARTIFACT ===