FEATURE: jq Literals and String Interpolation

Field	Value
Version	20260822 V1
Description	Parse jq literals, strings, escapes, interpolation, and format expressions.
Depends On	ARCHITECTURE.md, FEATURE-PARSE-001.md
Provides	JSON literals, jq strings, escapes, interpolation, format literals
Consumes	jq lexer and token stream

Scope

This story extends the lexer and parser with JSON-compatible numeric, boolean, and null literals; quoted jq strings; Unicode and JSON escapes; \(expression) interpolation; and @text, @json, @uri, and related format literals. Invalid escapes and malformed interpolation must be compile failures with exit status 3.

Programmatic Acceptance

=== AC parse-002-conformance ===
Intent: The executable passes every selected corpus case covering interpolation, URI formatting, and Base64 formatting.
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 ===

User Acceptance

None.

Guardrails

Use only Python standard-library facilities.
Preserve Unicode code points and jq generator behavior during interpolation.
Do not alter any file under sources/.