any-file to PDF (Phase 1): converters/ dispatcher, images/text/md/csv/json/xml/svg/pdf-passthrough, 112 tests green

converters/json_converter.py

@@ -0,0 +1,38 @@
+"""JSON -> PDF (pretty-printed, monospace).
+
+Validation is explicit (a JSON error is a *job* error with a clear message,
+not a render failure): whitespace-only input -> "empty JSON file: ...",
+unparseable input -> "Invalid JSON: <reason>". Valid documents are
+pretty-printed (indent=2, original key order) into <pre> with PRE_CSS so
+structure and indentation survive the render.
+"""
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+from . import common
+from .text_converter import decode_bytes
+
+
+def convert(path: Path, job_id: str, progress_cb=None, output_dir=None,
+            source_name=None) -> str:
+    """Render a JSON file to a pretty-printed monospace PDF."""
+    raw = path.read_bytes()
+    if not raw.strip():
+        raise ValueError("empty JSON file: nothing to convert")
+    text = decode_bytes(raw)
+    try:
+        obj = json.loads(text)
+    except json.JSONDecodeError as exc:
+        raise ValueError(f"Invalid JSON: {exc}") from exc
+    pretty = json.dumps(obj, indent=2, ensure_ascii=False)
+
+    def _build():
+        return f"<html><body><pre>{common.escape(pretty)}</pre></body></html>", path.name
+
+    return common.convert_single(
+        path, job_id, build_html=_build, css=common.PRE_CSS,
+        progress_cb=progress_cb, output_dir=output_dir,
+        name_src=source_name or path.name,
+    )