1 files changed, 0 insertions, 42 deletions
diff --git a/src/math.ts b/src/math.ts
deleted file mode 100644
index 71403f4..0000000
--- a/src/math.ts
+++ /dev/null
@@ -1,42 +0,0 @@
-import katex from 'katex';
-import 'katex/dist/katex.min.css';
-
-const options = { output: 'htmlAndMathml', throwOnError: false, strict: 'error', trust: false } as const;
-
-/** Render authored TeX with bundled fonts and a MathML equivalent for assistive technology. */
-export function renderEquation(element: HTMLElement, tex: string) {
-  element.classList.add('math-display');
-  element.tabIndex = 0; // Long equations can be scrolled with the keyboard on narrow screens.
-  katex.render(tex, element, { ...options, displayMode: true });
-}
-
-/** Plain prose with explicit $...$ inline math; everything outside delimiters stays text. */
-export function renderProse(element: HTMLElement, text: string) {
-  element.replaceChildren();
-  let offset = 0;
-  for (const match of text.matchAll(/\$([^$\n]+)\$/g)) {
-    element.append(document.createTextNode(text.slice(offset, match.index)));
-    const math = document.createElement('span');
-    katex.render(match[1], math, { ...options, displayMode: false });
-    element.append(math);
-    offset = match.index + match[0].length;
-  }
-  element.append(document.createTextNode(text.slice(offset)));
-}
-
-// Short UI labels retain their plain accessible names while sharing the lesson notation.
-const notation: Record<string, string> = {
-  'log₁₀(N / m⁻³)': String.raw`\log_{10}(N/\mathrm m^{-3})`,
-  'EF − Ei': 'E_F-E_i', 'U₁₂₃': 'U_{123}', 'ΔU₀': String.raw`\Delta U_0`,
-  'K + U': 'K+U', 'q₀': 'q_0', 'q₁': 'q_1', 'q₂': 'q_2', 'q₃': 'q_3',
-  'Uₐ': 'U_a', 'Uᵦ': 'U_b', 'Kₐ': 'K_a', 'rₐ': 'r_a', 'rᵦ': 'r_b',
-  'θₐ': String.raw`\theta_a`, 'θᵦ': String.raw`\theta_b`, 'τz': String.raw`\tau_z`,
-  '|Q|': '|Q|', '|P|': '|P|', '|E|': String.raw`|\vec E|`, 'Ex': 'E_x',
-  'Δx': String.raw`\Delta x`, 'θ': String.raw`\theta`, 'α': String.raw`\alpha`,
-  'κ': String.raw`\kappa`, 'σ': String.raw`\sigma`, '90°': String.raw`90^\circ`,
-};
-const notationPattern = new RegExp(Object.keys(notation).sort((a, b) => b.length - a.length).map(key => key.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')).join('|') + '|\\b[EqdnpUVK]\\b', 'g');
-
-export function renderNotation(element: HTMLElement, text: string) {
-  renderProse(element, text.replace(notationPattern, token => `$${notation[token] ?? token}$`));
-}