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

converters/svg_converter.py

@@ -0,0 +1,55 @@
+"""SVG -> PDF (vector render via WeasyPrint).
+
+SVG is XML by spec, so the document is first well-formedness-checked with
+lxml — an unbalanced file (e.g. "<svg><g></path>") is a *job* error with
+"Invalid SVG: <reason>", never a silent blank render (HTML5 foreign-content
+parsing would otherwise swallow the mismatch and succeed with an empty page).
+
+The SVG is then embedded verbatim in a minimal A4 HTML document; WeasyPrint
+renders SVG natively as a vector (text stays sharp, no rasterization). A
+forced page break guarantees at least one PDF page even for a degenerate
+document. A WeasyPrint render failure is also reported as "Invalid SVG: ...".
+"""
+from __future__ import annotations
+
+from pathlib import Path
+
+from lxml import etree
+
+from . import common
+
+_DOC = (
+    "<!DOCTYPE html><html><head><style>"
+    "@page { size: A4; margin: 20mm; }"
+    "body { margin: 0; font-kerning: none; }"
+    "svg { max-width: 100%; height: auto; }"
+    "</style></head><body>{svg}<div style='page-break-after: always'></div>"
+    "</body></html>"
+)
+
+
+def convert(path: Path, job_id: str, progress_cb=None, output_dir=None,
+            source_name=None) -> str:
+    """Render an SVG file to a vector PDF."""
+    raw = path.read_bytes()
+    if not raw.strip():
+        raise ValueError("empty file: nothing to convert")
+    svg_text = common.decode_text(raw)
+    try:
+        etree.fromstring(svg_text.encode("utf-8"))
+    except etree.XMLSyntaxError as exc:
+        raise ValueError(f"Invalid SVG: {exc}") from exc
+
+    doc = _DOC.replace("{svg}", svg_text)
+    out_dir = common.default_output_dir(output_dir)
+
+    common.report(progress_cb, 30.0, f"Rendering {path.name} (1/1)")
+    try:
+        pdf_bytes = common.html_to_pdf_bytes(doc)
+    except ValueError:
+        raise  # empty-file errors keep their own message
+    except Exception as exc:  # noqa: BLE001 - render failure is a job error
+        raise ValueError(f"Invalid SVG: {exc}") from exc
+    filename = common.derive_export_name(source_name or path.name, out_dir)
+    return common.finalize_pdf(pdf_bytes, out_dir, filename, job_id,
+                               progress_cb=progress_cb)