pptx/custom-properties-types

Parameter axes

• type (6 values): lpwstr, bool, i4, r8, filetime, date

Spec notes

Generator source

scripts/gen_custom_properties_types_pptx.py — runs with --arg_template --type {type.id} --value "{type.value}" --out fixtures/pptx/custom-properties-types--{type.id}.pptx

#!/usr/bin/env python3
"""Generate ``fixtures/pptx/custom-properties-types--<type>.pptx`` fixtures.

Parameterised generator; drives ``features/pptx/custom-properties-types.json``.
"""

from __future__ import annotations

import argparse
import datetime as _dt
from pathlib import Path

from pptx import Presentation

_REPO_ROOT = Path(__file__).resolve().parent.parent
_REPRODUCIBLE_DT = _dt.datetime(2000, 1, 1, 0, 0, 0)

_PINNED_CREATED = _dt.datetime(2026, 1, 1, 0, 0, 0, tzinfo=_dt.timezone.utc)
_PINNED_MODIFIED = _dt.datetime(2026, 1, 2, 0, 0, 0, tzinfo=_dt.timezone.utc)


def _coerce(vt_id: str, value: str):
    if vt_id == "lpwstr":
        return value
    if vt_id == "bool":
        return value.lower() == "true"
    if vt_id == "i4":
        return int(value)
    if vt_id == "r8":
        return float(value)
    if vt_id == "filetime":
        return _dt.datetime.strptime(value, "%Y-%m-%dT%H:%M:%S")
    if vt_id == "date":
        return _dt.datetime.strptime(value, "%Y-%m-%d").date()
    raise SystemExit(f"Unknown vt type id: {vt_id!r}")


def main() -> int:
    parser = argparse.ArgumentParser()
    parser.add_argument("--type", dest="type_id", required=True)
    parser.add_argument("--value", required=True)
    parser.add_argument(
        "--out",
        default=str(_REPO_ROOT / "fixtures" / "pptx" / "custom-properties-types.pptx"),
    )
    args = parser.parse_args()

    out_path = Path(args.out)
    if not out_path.is_absolute():
        out_path = _REPO_ROOT / out_path

    prs = Presentation()
    prs.slides.add_slide(prs.slide_layouts[6])
    prs.core_properties.created = _PINNED_CREATED
    prs.core_properties.modified = _PINNED_MODIFIED
    prs.custom_properties["TestProp"] = _coerce(args.type_id, args.value)
    out_path.parent.mkdir(parents=True, exist_ok=True)
    prs.save(out_path, zip_date_time=_REPRODUCIBLE_DT)
    print(out_path)
    return 0


if __name__ == "__main__":
    raise SystemExit(main())

Manifest (parent, unexpanded)

{
  "$schema": "../manifest.schema.json",
  "id": "pptx/custom-properties-types",
  "kind": "parameterised",
  "title": "Custom document properties: one case per vt: type",
  "format": "pptx",
  "category": "metadata",
  "summary": "The ``docProps/custom.xml`` part stores user-defined name/value pairs with a typed child from the ``vt:`` namespace. This family covers one case per type python-pptx can emit: lpwstr, bool, i4, r8, filetime, and (as of the Wave 8 W8-E fix) date.",
  "spec": {
    "source": "ecma-376-5-part-2",
    "clause": "11.2",
    "notes": "python-pptx's CustomProperties dict facade supports str (vt:lpwstr), int (vt:i4), float (vt:r8), bool (vt:bool), datetime.datetime (vt:filetime), and — as of Wave 8 W8-E — datetime.date (vt:date, ECMA-376 Part 1 §22.4.2.7)."
  },
  "fixtures": {
    "machine": "pptx/custom-properties-types"
  },
  "generator": {
    "python": "scripts/gen_custom_properties_types_pptx.py",
    "arg_template": "--type {type.id} --value \"{type.value}\" --out fixtures/pptx/custom-properties-types--{type.id}.pptx"
  },
  "parameters": {
    "type": [
      {
        "id": "lpwstr",
        "value": "hello world",
        "vt_element": "lpwstr",
        "vt_value": "hello world"
      },
      {
        "id": "bool",
        "value": "true",
        "vt_element": "bool",
        "vt_value": "true"
      },
      {
        "id": "i4",
        "value": "42",
        "vt_element": "i4",
        "vt_value": "42"
      },
      {
        "id": "r8",
        "value": "3.14159",
        "vt_element": "r8",
        "vt_value": "3.14159"
      },
      {
        "id": "filetime",
        "value": "2026-01-15T12:30:45",
        "vt_element": "filetime",
        "vt_value": "2026-01-15T12:30:45Z"
      },
      {
        "id": "date",
        "value": "2026-01-15",
        "vt_element": "date",
        "vt_value": "2026-01-15"
      }
    ]
  },
  "assertions_template": [
    {
      "id": "custom-{type.id}-present",
      "part": "docProps/custom.xml",
      "namespaces": {
        "op": "http://schemas.openxmlformats.org/officeDocument/2006/custom-properties",
        "vt": "http://schemas.openxmlformats.org/officeDocument/2006/docPropsVTypes"
      },
      "xpath": "//op:property[@name='TestProp']/vt:{type.vt_element}",
      "must": "exist",
      "description": "TestProp must carry a <vt:{type.vt_element}> child."
    },
    {
      "id": "custom-{type.id}-value",
      "part": "docProps/custom.xml",
      "namespaces": {
        "op": "http://schemas.openxmlformats.org/officeDocument/2006/custom-properties",
        "vt": "http://schemas.openxmlformats.org/officeDocument/2006/docPropsVTypes"
      },
      "xpath": "//op:property[@name='TestProp']/vt:{type.vt_element}",
      "must": "equal",
      "value": "{type.vt_value}",
      "description": "TestProp's <vt:{type.vt_element}> must carry the expected literal text."
    }
  ]
}