chore: import upstream snapshot with attribution

apps/sim/lib/pptx-renderer/model/theme.ts

@@ -0,0 +1,95 @@
+/**
+ * Theme parser — extracts color scheme and font definitions from a:theme XML.
+ */
+
+import type { SafeXmlNode } from '../parser/xml-parser'
+
+export interface ThemeData {
+  colorScheme: Map<string, string>
+  majorFont: { latin: string; ea: string; cs: string }
+  minorFont: { latin: string; ea: string; cs: string }
+  fillStyles: SafeXmlNode[] // from a:fillStyleLst children (indexed 1-based)
+  lineStyles: SafeXmlNode[] // from a:lnStyleLst children (indexed 1-based)
+  effectStyles: SafeXmlNode[] // from a:effectStyleLst children (indexed 1-based)
+}
+
+/** Known color scheme slot names in a:clrScheme. */
+const COLOR_SLOTS = [
+  'dk1',
+  'dk2',
+  'lt1',
+  'lt2',
+  'accent1',
+  'accent2',
+  'accent3',
+  'accent4',
+  'accent5',
+  'accent6',
+  'hlink',
+  'folHlink',
+] as const
+
+/**
+ * Extract a hex color value from a color definition node.
+ * Handles both `a:srgbClr@val` and `a:sysClr@lastClr`.
+ */
+function extractColor(node: SafeXmlNode): string | undefined {
+  const srgb = node.child('srgbClr')
+  if (srgb.exists()) {
+    return srgb.attr('val')
+  }
+  const sys = node.child('sysClr')
+  if (sys.exists()) {
+    return sys.attr('lastClr') ?? sys.attr('val')
+  }
+  return undefined
+}
+
+/**
+ * Parse font info from a majorFont or minorFont node.
+ * Extracts typeface attributes from latin, ea, and cs child elements.
+ */
+function parseFontInfo(fontNode: SafeXmlNode): { latin: string; ea: string; cs: string } {
+  return {
+    latin: fontNode.child('latin').attr('typeface') ?? '',
+    ea: fontNode.child('ea').attr('typeface') ?? '',
+    cs: fontNode.child('cs').attr('typeface') ?? '',
+  }
+}
+
+/**
+ * Parse a theme XML root (`a:theme`) into ThemeData.
+ */
+export function parseTheme(root: SafeXmlNode): ThemeData {
+  const themeElements = root.child('themeElements')
+
+  // --- Color scheme ---
+  const clrScheme = themeElements.child('clrScheme')
+  const colorScheme = new Map<string, string>()
+
+  for (const slot of COLOR_SLOTS) {
+    const slotNode = clrScheme.child(slot)
+    if (slotNode.exists()) {
+      const hex = extractColor(slotNode)
+      if (hex !== undefined) {
+        colorScheme.set(slot, hex)
+      }
+    }
+  }
+
+  // --- Font scheme ---
+  const fontScheme = themeElements.child('fontScheme')
+  const majorFont = parseFontInfo(fontScheme.child('majorFont'))
+  const minorFont = parseFontInfo(fontScheme.child('minorFont'))
+
+  // --- Format scheme ---
+  const fmtScheme = themeElements.child('fmtScheme')
+  const fillStyleLst = fmtScheme.child('fillStyleLst')
+  const fillStyles: SafeXmlNode[] = fillStyleLst.allChildren()
+  const lnStyleLst = fmtScheme.child('lnStyleLst')
+  const lineStyles: SafeXmlNode[] = lnStyleLst.allChildren()
+  const effectStyleLst = fmtScheme.child('effectStyleLst')
+  const effectStyles: SafeXmlNode[] = effectStyleLst.allChildren()
+
+  return { colorScheme, majorFont, minorFont, fillStyles, lineStyles, effectStyles }
+}