feat: add pptxgenjs translation engine (mechanical mapping)

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

renderer/chart-renderer.js

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+function renderChart(slide, chartData) {
+  slide.addChart(chartData.chartType, chartData.data, chartData.options);
+}
+
+module.exports = { renderChart };

renderer/image-renderer.js

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+function renderImage(slide, imageData) {
+  slide.addImage(imageData.options);
+}
+
+module.exports = { renderImage };

renderer/index.js

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+const pptxgen = require('pptxgenjs');
+const fs = require('fs');
+const { renderSlide } = require('./slide-renderer');
+
+function render(pptxJson) {
+  const pptx = new pptxgen();
+  const data = typeof pptxJson === 'string' ? JSON.parse(pptxJson) : pptxJson;
+  const pres = data.presentation || {};
+  const slides = data.slides || [];
+
+  if (pres.layout) pptx.layout = pres.layout;
+  if (pres.author) pptx.author = pres.author;
+  if (pres.title) pptx.title = pres.title;
+  if (pres.subject) pptx.subject = pres.subject;
+  if (pres.company) pptx.company = pres.company;
+  if (pres.revision) pptx.revision = pres.revision;
+  if (pres.rtlMode !== undefined) pptx.rtlMode = pres.rtlMode;
+  if (pres.theme) pptx.theme = pres.theme;
+
+  slides.forEach(slideData => renderSlide(pptx, slideData));
+
+  return pptx;
+}
+
+async function renderFile(inputPath, outputPath) {
+  const json = fs.readFileSync(inputPath, 'utf8');
+  const pptx = render(json);
+  return pptx.writeFile({ fileName: outputPath });
+}
+
+module.exports = { render, renderFile };

renderer/shape-renderer.js

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+function renderShape(slide, shapeData) {
+  slide.addShape(shapeData.shapeName, shapeData.options);
+}
+
+module.exports = { renderShape };

renderer/slide-renderer.js

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+const { renderText } = require('./text-renderer');
+const { renderShape } = require('./shape-renderer');
+const { renderTable } = require('./table-renderer');
+const { renderImage } = require('./image-renderer');
+const { renderChart } = require('./chart-renderer');
+
+function renderSlide(pptx, slideData) {
+  const slide = pptx.addSlide();
+
+  if (slideData.background) slide.background = slideData.background;
+  if (slideData.color) slide.color = slideData.color;
+  if (slideData.hidden) slide.hidden = slideData.hidden;
+
+  const objects = slideData.objects || [];
+  objects.forEach(obj => {
+    switch (obj.type) {
+      case 'text':
+        renderText(slide, obj);
+        break;
+      case 'shape':
+        renderShape(slide, obj);
+        break;
+      case 'table':
+        renderTable(slide, obj);
+        break;
+      case 'image':
+        renderImage(slide, obj);
+        break;
+      case 'chart':
+        renderChart(slide, obj);
+        break;
+    }
+  });
+}
+
+module.exports = { renderSlide };

renderer/table-renderer.js

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+function renderTable(slide, tableData) {
+  slide.addTable(tableData.rows, tableData.options);
+}
+
+module.exports = { renderTable };

renderer/text-renderer.js

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+function renderText(slide, textData) {
+  slide.addText(textData.text, textData.options);
+}
+
+module.exports = { renderText };