powerpoint-automation

name	powerpoint-automation
description	Create professional PowerPoint presentations from various sources including web articles, blog posts, and existing PPTX files. Use when creating PPTX, converting articles to slides, or translating presentations.
license	CC BY-NC-SA 4.0
metadata	{"author":"yamapan (https://github.com/aktsmm)"}

PowerPoint Automation

AI-powered PPTX generation using Orchestrator-Workers pattern.

When to Use

• PowerPoint, PPTX, create presentation, slides
• Convert web articles/blog posts to presentations
• Translate English PPTX to Japanese
• Create presentations using custom templates

Quick Start

From Web Article:

Create a 15-slide presentation from: https://zenn.dev/example/article

From Existing PPTX:

Translate this presentation to Japanese: input/presentation.pptx

Workflow

TRIAGE → PLAN → PREPARE_TEMPLATE → EXTRACT → TRANSLATE → BUILD → REVIEW → DONE

Phase	Script/Agent	Description
EXTRACT	extract_images.py	Content → content.json
BUILD	create_from_template.py	Generate PPTX
REVIEW	PPTX Reviewer	Quality check

Key Scripts

→ references/SCRIPTS.md for complete reference

Script	Purpose
create_from_template.py	Generate PPTX from content.json (main)
reconstruct_analyzer.py	Convert PPTX → content.json
extract_images.py	Extract images from PPTX/web
validate_content.py	Validate content.json schema
validate_pptx.py	Detect text overflow

content.json (IR)

All agents communicate via this intermediate format:

{
  "slides": [
    { "type": "title", "title": "Title", "subtitle": "Sub" },
    { "type": "content", "title": "Topic", "items": ["Point 1"] }
  ]
}

→ references/schemas/content.schema.json

Templates

Template	Purpose	Layouts
assets/template.pptx	デフォルト (Japanese, 16:9)	4 layouts

template レイアウト詳細

Index	Name	Category	用途
0	タイトル スライド	title	プレゼン冒頭
1	タイトルとコンテンツ	content	標準コンテンツ
2	1_タイトルとコンテンツ	content	標準コンテンツ（別版）
3	セクション見出し	section	セクション区切り

使用例:

python scripts/create_from_template.py assets/template.pptx content.json output.pptx --config assets/template_layouts.json

テンプレート管理のベストプラクティス

複数デザイン（スライドマスター）の整理

テンプレートPPTXに複数のスライドマスターが含まれている場合、出力が不安定になることがあります。

確認方法:

python scripts/create_from_template.py assets/template.pptx --list-layouts

対処法:

1. PowerPointでテンプレートを開く
2. [表示] → [スライドマスター] を選択
3. 不要なスライドマスターを削除
4. 保存後、template_layouts.json を再生成

python scripts/analyze_template.py assets/template.pptx

content.json の階層構造

箇条書きに階層構造（インデント）を持たせる場合は items ではなく bullets 形式を使用（items はフラット表示になる）：

{"type": "content", "bullets": [
  {"text": "項目1", "level": 0},
  {"text": "詳細1", "level": 1},
  {"text": "項目2", "level": 0}
]}

Agents

→ references/agents/ for definitions

Agent	Purpose
Orchestrator	Pipeline coordination
Localizer	Translation (EN ↔ JA)
PPTX Reviewer	Final quality check

Design Principles

• SSOT: content.json is canonical
• SRP: Each agent/script has one purpose
• Fail Fast: Max 3 retries per phase
• Human in Loop: User confirms at PLAN phase

URL Format in Slides

Reference URLs must use "Title - URL" format for APPENDIX slides:

VPN Gateway の新機能 - https://learn.microsoft.com/ja-jp/azure/vpn-gateway/whats-new

→ references/content-guidelines.md for details

References

File	Content
SCRIPTS.md	Script documentation
USE_CASES.md	Workflow examples
content-guidelines.md	URL format, bullets
agents/	Agent definitions
schemas/	JSON schemas

Technical Content Addition (Azure/MS Topics)

When adding Azure/Microsoft technical content to slides, follow the same verification workflow as QA:

Workflow

[Content Request] → [Researcher] → [Reviewer] → [PPTX Update]
                         ↓              ↓
                   Docs MCP 検索    内容検証

Required Steps

1. Research Phase: Use microsoft_docs_search / microsoft_docs_fetch to gather official information
2. Review Phase: Verify the accuracy of content before adding to slides
3. Build Phase: Update content.json and regenerate PPTX

Forbidden

• ❌ Adding technical content without MCP verification
• ❌ Skipping review for "simple additions"
• ❌ Generating PPTX while PowerPoint has the file open

File Lock Prevention

Before generating PPTX, check if the file is locked:

# Check if file is locked
$path = "path/to/file.pptx"
try { [IO.File]::OpenWrite($path).Close(); "File is writable" }
catch { "File is LOCKED - close PowerPoint first" }

Shape-based Architecture Diagrams

When creating network/architecture diagrams, use PowerPoint shapes instead of ASCII art text boxes. ASCII art is unreadable in presentation mode.

Design Pattern

from pptx.enum.shapes import MSO_SHAPE
from pptx.dml.color import RGBColor
from pptx.util import Cm, Pt

# Color scheme
AZURE_BLUE = RGBColor(0, 120, 212)
LIGHT_BLUE = RGBColor(232, 243, 255)
ONPREM_GREEN = RGBColor(16, 124, 65)
LIGHT_GREEN = RGBColor(232, 248, 237)

# Outer frame (Azure VNet)
box = slide.shapes.add_shape(MSO_SHAPE.ROUNDED_RECTANGLE, left, top, w, h)
box.fill.solid()
box.fill.fore_color.rgb = LIGHT_BLUE
box.line.color.rgb = AZURE_BLUE

# Dashed connector (tunnel)
conn = slide.shapes.add_connector(1, x1, y1, x2, y2)  # 1 = straight
conn.line.color.rgb = AZURE_BLUE
conn.line.dash_style = 2  # dash

Layout Tips

• Use Cm() for positioning (not Inches()) — easier to reason about on metric-based slides
• Leave at least 1.5cm vertical gap between Azure and on-premises zones for tunnel lines
• Place labels inside boxes (not overlapping edges) to avoid visual clutter
• Use color coding to distinguish zones: blue = Azure, green = on-premises, orange = cross-connect
• For dual diagrams (side-by-side), split slide into left/right halves with 12cm left margin for the right diagram

Anti-patterns

❌ ASCII art in textboxes (unreadable in presentation mode)
❌ Overlapping shapes due to insufficient spacing
❌ Placing labels outside their parent containers
❌ Using absolute EMU values without helper functions

Hyperlink Batch Processing

Batch-add hyperlinks and page titles to all URLs in a presentation:

Workflow

import re
url_pattern = re.compile(r'(https?://[^\s\)）]+)')

# 1. Build URL→Title map (use MCP docs_search or fetch_webpage)
URL_TITLES = {
    'https://learn.microsoft.com/.../whats-new': 'Azure VPN Gateway の新機能',
    ...
}

# 2. Iterate all runs and add hyperlinks
for slide in prs.slides:
    for shape in slide.shapes:
        if not shape.has_text_frame:
            continue
        for para in shape.text_frame.paragraphs:
            for run in para.runs:
                urls = url_pattern.findall(run.text)
                for url in urls:
                    if not (run.hyperlink and run.hyperlink.address):
                        run.hyperlink.address = url.rstrip('/')
                    # Prepend title if missing
                    title = URL_TITLES.get(url.rstrip('/'))
                    if title and title not in run.text:
                        run.text = f'{title}\n{url}'

Verification

hlink_count = sum(
    1 for slide in prs.slides
    for shape in slide.shapes if shape.has_text_frame
    for para in shape.text_frame.paragraphs
    for run in para.runs
    if run.hyperlink and run.hyperlink.address
)
print(f'Hyperlinks: {hlink_count}')

XML Direct Hyperlink Insertion (L16)

run.hyperlink.address が機能しない場合（既存 PPTX のレイアウト変更後など）、 XML 要素 a:hlinkClick を直接挿入する方が確実。

from lxml import etree
from pptx.oxml.ns import qn
from pptx.dml.color import RGBColor
import re

url_pattern = re.compile(r'(https?://[^\s\)）」、。]+)')

for slide in prs.slides:
    for shape in slide.shapes:
        if not shape.has_text_frame:
            continue
        for para in shape.text_frame.paragraphs:
            for run in para.runs:
                if run._r.find(qn('a:hlinkClick')) is not None:
                    continue  # Already has link
                urls = url_pattern.findall(run.text)
                for url in urls:
                    url_clean = url.rstrip('.,;:')
                    # Add external relationship
                    rel = slide.part.relate_to(
                        url_clean,
                        'http://schemas.openxmlformats.org/officeDocument/2006/relationships/hyperlink',
                        is_external=True)
                    # Get or create rPr element
                    rPr = run._r.find(qn('a:rPr'))
                    if rPr is None:
                        rPr = etree.SubElement(run._r, qn('a:rPr'))
                        t_elem = run._r.find(qn('a:t'))
                        if t_elem is  :
                            run._r.remove(rPr)
                            run._r.insert(, rPr)
                    
                    hlinkClick = etree.SubElement(rPr, qn())
                    hlinkClick.(qn(), rel)
                    
                    run.font.underline = 
                    run.font.color.rgb = RGBColor(, , )

Font Theme Token Resolution (ZIP-level)

python-pptx sometimes leaves theme tokens (+mn-ea, +mj-lt) unresolved, causing font fallback. Fix via ZIP-level string replacement:

import zipfile, re, shutil

FONT_JA = 'BIZ UDPゴシック'
FONT_LATIN = 'BIZ UDPGothic'

tmp = out + '.tmp'
shutil.copy2(out, tmp)
with zipfile.ZipFile(tmp, 'r') as zin:
    with zipfile.ZipFile(out, 'w', zipfile.ZIP_DEFLATED) as zout:
        for item in zin.infolist():
            data = zin.read(item.filename)
            if item.filename.endswith('.xml'):
                content = data.decode('utf-8')
                content = content.replace('+mn-ea', FONT_JA)
                content = content.replace('+mj-ea', FONT_JA)
                content = content.replace('+mn-lt', FONT_LATIN)
                content = content.replace('+mj-lt', FONT_LATIN)
                content = re.sub(
                    r'(<a:ea typeface=")[^"]*(")',
                    f'\\g<1>{FONT_JA}\\2', content
                )
                data = content.encode('utf-8')
            zout.writestr(item, data)
os.remove(tmp)

⚠️ Always do this after prs.save(), not before.

Section Management via XML

PowerPoint sections are stored as an extension in ppt/presentation.xml. python-pptx has no native section API.

Adding/Updating Sections

import re, uuid, zipfile

SECTION_URI = '{521415D9-36F7-43E2-AB2F-B90AF26B5E84}'
P14_NS = 'http://schemas.microsoft.com/office/powerpoint/2010/main'

# Read presentation.xml from ZIP
with zipfile.ZipFile(pptx_path) as z:
    pres_xml = z.read('ppt/presentation.xml').decode('utf-8')

# Ensure p14 namespace is declared
if f'xmlns:p14="{P14_NS}"' not in pres_xml:
    pres_xml = pres_xml.replace('<p:presentation',
        f'<p:presentation xmlns:p14="{P14_NS}"', 1)

# Extract slide IDs
slide_ids = re.findall(r'<p:sldId id="(\d+)"', pres_xml)

# Define sections: (name, start_slide_0based)
sections = [("表紙", 0), ("本編", 2), ("Appendix", 15)]

# Build section XML
section_parts = []
for idx, (name, start) in enumerate(sections):
    end = sections[idx+1][1] if idx+1 < len(sections) else len(slide_ids)
    refs = ''.join(f'<p14:sldId id="{slide_ids[i]}"/>'
                   for i in range(start, min(end, len(slide_ids))))
    sec_id = '{' + (uuid.uuid4()).upper() + 
    section_parts.append(
        
        
    )


new_ext = (
           
           + .join(section_parts)
           + )

Important Notes

• The URI {521415D9-36F7-43E2-AB2F-B90AF26B5E84} is specific to the presenter's PowerPoint version; some versions use different URIs
• Always remove existing section XML before inserting new ones (avoid duplicates)
• Section changes only show in PowerPoint's slide sorter view after re-opening the file

Slide Layout Change (Safe Pattern)

python-pptx does NOT safely support direct layout swapping. Use the add-move-hide-cleanup pattern:

1. add_slide(target_layout) — new slide at the end
2. Set title text on the new slide's placeholder (placeholder_format.idx == 0)
3. Move new slide to old slide's position via sldIdLst XML manipulation (reverse order)
4. Hide & clear old slide (show='0', remove shapes)
5. Save, re-open, delete hidden slides in a separate pass

# Step 3: Move new slide (last) before old slide
sldIdLst = prs.part._element.find(qn('p:sldIdLst'))
slides_list = list(sldIdLst)
new_el = slides_list[-1]
old_el = list(sldIdLst)[target_idx]
sldIdLst.remove(new_el)
sldIdLst.insert(list(sldIdLst).index(old_el), new_el)

# Step 4: Hide old slide (now at target_idx + 1)
old_slide._element.set('show', '0')
for shape in list(old_slide.shapes):
    shape._element.getparent().remove(shape._element)

Forbidden Patterns (★ Critical)

Pattern	Problem	Result
rel._target = new_layout.part without ZIP dedup	Duplicate ZIP entries corrupt layout	PowerPoint repair dialog
prs.part.drop_rel(rId) for slide deletion	Orphan XML in ZIP	Duplicate name warning → corruption
show='0' while indices shift	Wrong slides hidden	Content silently disappears
Changing layout but keeping empty placeholders	Ghost text ("テキストを入力") visible	Unprofessional appearance

Layout Change via rel._target (Safe Pattern with ZIP Dedup)

L12: rel._target 方式は ZIP dedup（LAST 優先）を併用すれば安全に動作する。 python-pptx の save() が重複エントリを生むが、後処理で解決可能。

from collections import Counter
import zipfile

# 1. Change layout relationship
blank_part = layout_parts['Blank']
for rel in slide.part.rels.values():
    if 'slideLayout' in rel.reltype:
        rel._target = blank_part
        break

# 2. Save (will have duplicate ZIP entries)
prs.save(raw_path)

# 3. Dedup ZIP: keep LAST entry for duplicates (has updated rels)
with zipfile.ZipFile(raw_path, 'r') as zin:
    items = zin.infolist()
    counts = Counter(i.filename for i in items)
    dups = {n for n, c in counts.items() if c > 1}
    last_idx = {}
    for idx, item in enumerate(items):
        if item.filename in dups:
            last_idx[item.filename] = idx
    seen = set()
    with zipfile.ZipFile(final_path, 'w', zipfile.ZIP_DEFLATED) as zout:
        for idx, item in enumerate(items):
            if item.filename in dups:
                if idx == last_idx[item.filename]:
                    zout.writestr(item, zin.read(item.filename))
            elif item.filename not in seen:
                seen.add(item.filename)
                zout.writestr(item, zin.read(item.filename))

⚠️ FIRST 優先だと変更前の rels XML が残り、レイアウト変更が反映されない。必ず LAST 優先。

Ghost Placeholder Elimination

L13: 既存 PPTX にスライドを追加する際、Title and Content や Section Title レイアウトを使うと 空のプレースホルダー（「テキストを入力」「タイトルを入力」）がゴースト表示される。

解決策: 新規スライドは Blank レイアウトを使い、タイトルは既存プレースホルダーに値を入れるか手動配置する。

# Strategy: Fill placeholder with actual title, remove empty ones
ns_p = '{http://schemas.openxmlformats.org/presentationml/2006/main}'

for shape in slide.shapes:
    ph_elem = shape._element.find(f'.//{ns_p}ph')
    if ph_elem is None:
        continue
    ph_type = ph_elem.get('type', 'body')
    if ph_type == 'title' and not shape.text_frame.text.strip():
        # Fill with actual title text
        shape.text_frame.text = slide_title
        for run in shape.text_frame.paragraphs[0].runs:
            run.font.size = Pt(28)
            run.font.bold = True
    elif not shape.text_frame.text.strip():
        # Remove empty placeholder
        shape._element.getparent().remove(shape._element)

Consistent Title Positioning (Cross-slide Alignment)

L14: 新規追加スライドのタイトル位置を既存スライドと揃えるには、 基準スライドの位置を計測して全スライドに適用する。

# 1. Measure reference slide (e.g., slide 4)
ref_slide = prs.slides[3]
for shape in ref_slide.shapes:
    ph = shape._element.find(f'.//{ns_p}ph')
    if ph is not None and ph.get('type') == 'title':
        REF_LEFT = shape.left      # 588263
        REF_TOP = shape.top        # 457200
        REF_WIDTH = shape.width    # 11018520
        REF_HEIGHT = shape.height  # 553998
        break

# 2. Apply to all new slides
for slide in new_slides:
    title_ph.left = REF_LEFT
    title_ph.top = REF_TOP
    title_ph.width = REF_WIDTH
    title_ph.height = REF_HEIGHT

Preserving Original Layouts When Modifying Existing PPTX

L15: 既存 PPTX を再構成する際、オリジナルスライドのレイアウトを保持するには タイトルテキストをキーにしたマッピングを作成する。

# Build original layout map
prs_orig = Presentation('original.pptx')
orig_layouts = {}
for slide in prs_orig.slides:
    for shape in slide.shapes:
        if shape.has_text_frame and shape.text_frame.text.strip():
            title = shape.text_frame.text.replace('\n', ' ')[:50]
            orig_layouts[title] = slide.slide_layout.name
            break

# Apply: ORIG slides keep original layout, NEW slides use Blank
for slide in prs_edit.slides:
    title = get_slide_title(slide)
    if title in orig_layouts:
        restore_layout(slide, orig_layouts[title])
    else:
        set_layout(slide, 'Blank')

Safe Hidden Slide Cleanup

Delete hidden slides in a separate script/pass after saving, in reverse index order:

# Cleanup pass (separate from insertion)
prs = Presentation(saved_file)
sldIdLst = prs.part._element.find(qn('p:sldIdLst'))

for i, slide in enumerate(prs.slides):
    if slide._element.get('show') == '0':
        # Verify truly empty before deleting
        has_content = any(
            para.text.strip()
            for shape in slide.shapes if shape.has_text_frame
            for para in shape.text_frame.paragraphs
        )
        if has_content:
            del slide._element.attrib['show']  # Restore, not delete

# Delete empty hidden slides (reverse order)
for idx in reversed(empty_hidden_indices):
    el = list(sldIdLst)[idx]
    rId = el.get(qn('r:id'))
    sldIdLst.remove(el)
    prs.part.drop_rel(rId)

prs.save(output_new_name)  # Always save to NEW filename

Post-Processing (URL Linkification)

⚠️ create_from_template.py does not process footer_url. Post-processing required.

Items Requiring Post-Processing

Item	Processing
footer_url	Add linked textbox at slide bottom
URLs in bullets	Convert to hyperlinks
Reference URLs	Linkify URLs in Appendix

Save with Different Name (File Lock Workaround)

PowerPoint locks open files.同名保存は PermissionError になるため、必ず別名で保存：

prs.save('file_withURL.pptx')

Processing	Suffix
URL added	_withURL
Final version	_final
Fixed version	_fixed

16:9 Slide Centering (Known Issue)

L9: Presentation() のデフォルトプレースホルダは 4:3 (25.4cm) 基準。 slide_width = Cm(33.867) で 16:9 に変更しても プレースホルダ位置は 4:3 のまま → 全スライドが左寄りに表示される。

推奨パターン: Blank + 手動配置

prs = Presentation()
prs.slide_width = Cm(33.867)  # 16:9
prs.slide_height = Cm(19.05)
SW = prs.slide_width

# Blank layout (プレースホルダなし) を使う
slide = prs.slides.add_slide(prs.slide_layouts[6])

# SW 基準で中央配置
margin = Cm(3)
tb = slide.shapes.add_textbox(margin, Cm(5), SW - margin * 2, Cm(3))
p = tb.text_frame.paragraphs[0]
p.text = "Centered Title"
p.alignment = PP_ALIGN.CENTER

Anti-patterns

❌ Layout 0-5 を 16:9 スライドで使う（プレースホルダが 25.4cm 基準で左寄り）
❌ slide_width 変更後にプレースホルダ位置を未調整のまま使う
✅ Blank レイアウト + add_textbox() で SW 基準の対称マージン配置
✅ テンプレート PPTX 自体が 16:9 で作成されていれば Layout 0-5 も OK

Template Corruption Recovery

L10: .gitattributes の *.pptx binary が git add 後 に追加された場合、 CRLF/エンコーディング変換でバイナリが破壊される（UTF-8 replacement char EF BF BD が混入）。

診断方法

with open('template.pptx', 'rb') as f:
    data = f.read()
count = data.count(b'\xef\xbf\xbd')
print(f'UTF-8 replacement chars: {count}')  # 0 以外なら破損

復旧方法

# python-pptx で空テンプレートを再生成
from pptx import Presentation
prs = Presentation()
prs.slide_width = Cm(33.867)  # 16:9
prs.slide_height = Cm(19.05)
prs.save('template_new.pptx')
# → 11 layouts が自動生成される（4:3 プレースホルダ注意）

予防策

• .gitattributes は 最初のコミット前 に設定する
• skill-ninja 等の自動インストーラ経由の場合、.gitignore による除外とバイナリ管理の整合性を確認

Video Embedding (ZIP Direct Manipulation)

L11: python-pptx は公式に MP4 埋め込み非対応。 しかし PPTX は ZIP なので lxml + zipfile で直接操作すれば埋め込み可能。

必要な操作

1. slide XML: p:pic に a:videoFile + p14:media を注入
2. slide rels: video/image リレーションシップを追加 (rId)
3. [Content_Types].xml: <Default Extension="mp4" ContentType="video/mp4"/> を追加
4. ZIP: ppt/media/ に MP4 ファイルとポスター画像を格納

XML パターン

<p:pic>
  <p:nvPicPr>
    <p:cNvPr id="100" name="Video 1">
      <a:hlinkClick r:id="" action="ppaction://media"/>
    </p:cNvPr>
    <p:cNvPicPr><a:picLocks noChangeAspect="1"/></p:cNvPicPr>
    <p:nvPr>
      <a:videoFile r:link="rId10"/>
      <p:extLst>
        <p:ext uri="{DAA4B4D4-6D71-4841-9C94-3DE7FCFB9230}">
          <p14:media r:embed="rId11"/>
        </p:ext>
      </p:extLst>
    </p:nvPr>
  </p:nvPicPr>
  <p:blipFill>
    <a:blip r:embed="rId12"/>  <!-- poster image -->
    <a:stretch><a:fillRect/>
  
  
    
      
      
    
    
  

Slide Rels (3 リレーションシップ必要)

<Relationship Id="rId10" Type=".../relationships/video"
              Target="../media/video.mp4" TargetMode="Internal"/>
<Relationship Id="rId11" Type=".../2007/relationships/media"
              Target="../media/video.mp4"/>
<Relationship Id="rId12" Type=".../relationships/image"
              Target="../media/poster.png"/>

注意事項

• PowerPoint が「修復しますか？」と聞く場合がある（軽微な XML 不整合） → 「はい」で自動修復される
• ポスター画像は必須（表示用サムネイル）
• ファイルサイズ注意: 動画を ZIP 圧縮すると PPTX が肥大化。Git 管理には LFS 推奨

XML Serialization Artifacts (★ Critical)

L17: python-pptx の save() は全 XML を再シリアライズする。 その際 " → '（属性クォート）、\r\n → \n（改行）に変換される。 これだけでレイアウト背景（画像 blipFill）の描画が壊れ、スライドが真っ白になることがある。

原因

• スライドマスター/レイアウトの <p:bg> が <a:blipFill r:embed="rId2"> で背景画像を参照
• python-pptx がレイアウト XML を再シリアライズ → PowerPoint が微妙な差異を嫌い背景を表示しない

解決策: ZIP 再構築パターン（原本復元）

python-pptx でスライド内容を編集した後、レイアウト/マスター/テーマ/メディアファイルはオリジナル PPTX からバイト単位で復元する。

import zipfile
from collections import Counter

orig_files = {}
with zipfile.ZipFile('original.pptx', 'r') as z:
    for item in z.infolist():
        fn = item.filename
        if any(p in fn for p in ['slideLayout', 'slideMaster', 'theme', '/media/']):
            orig_files[fn] = z.read(fn)

with zipfile.ZipFile('edited.pptx', 'r') as zin:
    with zipfile.ZipFile('output.pptx', 'w', zipfile.ZIP_DEFLATED) as zout:
        seen = set()
        for item in zin.infolist():
            fn = item.filename
            if fn in seen:
                continue
            seen.add(fn)
            if fn in orig_files:
                zout.writestr(item, orig_files[fn])  # byte-for-byte original
            else:
                zout.writestr(item, zin.read(fn))
        for fn, data in orig_files.items():
            if fn not in seen:
                zout.writestr(fn, data)
                seen.add(fn)

SVG Content Type 欠落 (L18)

python-pptx は [Content_Types].xml から SVG エントリを落とすことがある。 テーマ/マスターが SVG を参照している場合、表示が壊れる。

ct_data = z.read('[Content_Types].xml').decode('utf-8')
if 'image/svg+xml' not in ct_data:
    ct_data = ct_data.replace(
        '</Types>',
        '<Default Extension="svg" ContentType="image/svg+xml"/></Types>'
    )

安全な TextBox コンテンツ置換 (L19)

text_frame.clear() は python-pptx 内部の段落リストとの不整合を起こすことがある。 代わりに txBody の <a:p> 要素を直接操作する。

from lxml import etree
from pptx.oxml.ns import qn

def set_textbox_content(shape, lines):
    """Safe textbox rewrite via XML manipulation.
    lines: list of (text, bold, size_pt) tuples.
    """
    txBody = shape._element.find(qn('p:txBody'))
    if txBody is None:
        txBody = shape._element.find(qn('a:txBody'))
    
    # Remove existing paragraphs
    for old_p in txBody.findall(qn('a:p')):
        txBody.remove(old_p)
    
    # Add new paragraphs
    for text, bold, size in lines:
        p = etree.SubElement(txBody, qn('a:p'))
        r = etree.SubElement(p, qn('a:r'))
        rPr = etree.SubElement(r, qn('a:rPr'))
        rPr.set('lang', 'ja-JP')
        rPr.set('sz', str(int(size * 100)))
        if bold:
            rPr.set('b', '1')
        solidFill = etree.SubElement(rPr, qn('a:solidFill'))
        srgbClr = etree.SubElement(solidFill, qn('a:srgbClr'))
        srgbClr.set('val', '333333')
        t = etree.SubElement(r, qn('a:t'))
        t.text = text

推奨ワークフロー（既存 PPTX 編集時）

1. python-pptx でスライド内容 (sp, txBody) を編集
2. prs.save('raw.pptx')
3. ZIP 再構築: layout/master/theme/media を原本から復元
4. [Content_Types].xml で SVG 等の欠落を補完
5. ZIP dedup (LAST 優先) で重複エントリを除去
6. output.pptx を別名で保存

Done Criteria

• content.json generated and validated
• PPTX file created successfully
• No text overflow detected
• User confirmed output quality