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function parseTeachMarkdown(raw) {
raw = raw.replace(/^```\s*\n?/, "");
const blocks = raw.split(/^---\s*$/m);
const steps = [];
for (const block of blocks) {
const text = block.trim();
if (!text) continue;
const codes = [];
let match;
const codeRe = /```(rust|toml|bash|text)\n([\s\S]*?)```/g;
while ((match = codeRe.exec(text)) !== null) {
const lang = match[1];
const code = match[2].trimEnd();
codes.push({ lang, code });
}
const last = codes.length > 0 ? codes[codes.length - 1] : null;
const code = last ? { lang: last.lang, code: last.code } : null;
const speech = text
.replace(/```(rust|toml|bash|text)\n[\s\S]*?```/g, "")
.trim();
const paragraphs = speech
.split(/\n+/)
.map((s) => s.trim())
.filter(Boolean);
steps.push({ code, paragraphs });
}
let lastCode = "";
let lastLang = "rust";
let lastParagraphs = [];
for (const step of steps) {
if (step.code !== null) {
lastCode = step.code.code;
lastLang = step.code.lang;
step.code = { lang: lastLang, code: lastCode };
} else {
step.code = { lang: lastLang, code: lastCode };
}
if (step.paragraphs.length > 0) {
lastParagraphs = step.paragraphs;
} else {
step.paragraphs = lastParagraphs;
}
}
return steps;
}
function renderCode(codeInfo) {
if (!codeInfo || !codeInfo.code) return "";
const lang = codeInfo.lang || "rust";
const code = codeInfo.code;
const lines = code.split("\n");
const html = [];
const plainText = lang === "text";
for (let i = 0; i < lines.length; i++) {
const lineNum = i + 1;
const rawLine = lines[i];
const prefix = `<span class="line-num">${lineNum}</span>`;
if (plainText) {
html.push(`${prefix}${escapeHtml(rawLine)}`);
continue;
}
const hl = rawLine.match(/^(.*?)\s*<{8,}\s*"([^"]*?)"\s*$/);
if (hl) {
const indent = rawLine.match(/^\s*/)[0];
const hlCode = hljs.highlight(indent + hl[1].trimStart(), {
language: lang,
}).value;
html.push(
`${prefix}${hlCode} <span class="bubble">${escapeHtml(hl[2])}</span>`,
);
} else if (rawLine.trim() === "") {
html.push(prefix);
} else {
const hlLine = hljs.highlight(rawLine, { language: lang }).value;
html.push(`${prefix}${hlLine}`);
}
}
return html.join("\n");
}
function escapeHtml(text) {
return text
.replace(/&/g, "&")
.replace(/</g, "<")
.replace(/>/g, ">");
}
function renderSpeech(paragraphs) {
return paragraphs
.map((p) => {
if (p.startsWith("> ")) {
return `<div class="cmd">${escapeHtml(p.slice(2))}</div>`;
}
let html = p
.replace(/`([^`]+)`/g, "<code>$1</code>")
.replace(
/\*\*([^*]+)\*\*/g,
'<strong style="color:#7dcfff">$1</strong>',
);
return `<p>${html}</p>`;
})
.join("");
}
const dom = {
code: document.getElementById("codeDisplay"),
speech: document.getElementById("speechDisplay"),
stepNum: document.getElementById("stepNum"),
totalSteps: document.getElementById("totalSteps"),
progress: document.getElementById("progressFill"),
progressText: document.getElementById("progressText"),
prevBtn: document.getElementById("prevBtn"),
nextBtn: document.getElementById("nextBtn"),
};
let steps = [];
let currentStep = 0;
function goToStep(index) {
currentStep = Math.max(0, Math.min(index, steps.length - 1));
const step = steps[currentStep];
dom.code.innerHTML = renderCode(step.code);
dom.speech.innerHTML = renderSpeech(step.paragraphs);
dom.stepNum.textContent = currentStep + 1;
dom.totalSteps.textContent = steps.length;
const pct =
steps.length > 1
? Math.round((currentStep / (steps.length - 1)) * 100)
: 100;
dom.progress.style.width = pct + "%";
dom.progressText.textContent = pct + "%";
dom.prevBtn.disabled = currentStep === 0;
const isLast = currentStep === steps.length - 1;
dom.nextBtn.disabled = false;
dom.nextBtn.textContent = isLast ? "🎉 COMPLETE" : "NEXT ▶";
}
dom.prevBtn.addEventListener("click", () => goToStep(currentStep - 1));
dom.nextBtn.addEventListener("click", () => {
if (currentStep < steps.length - 1) goToStep(currentStep + 1);
});
document.addEventListener("keydown", (e) => {
if (e.key === "ArrowRight" || e.key === " " || e.key === "Enter") {
e.preventDefault();
if (currentStep < steps.length - 1) goToStep(currentStep + 1);
} else if (e.key === "ArrowLeft") {
e.preventDefault();
if (currentStep > 0) goToStep(currentStep - 1);
}
});
async function loadTutorial(filePath) {
try {
const resp = await fetch(filePath);
const raw = await resp.text();
steps = parseTeachMarkdown(raw);
dom.totalSteps.textContent = steps.length;
goToStep(0);
} catch (e) {
dom.code.textContent = "Load tutorial failed: " + e.message;
}
}
const params = new URLSearchParams(window.location.search);
const tutorialFile = "sources/" + (params.get("tur") || "default.md");
const title = params.get("title");
if (title) {
document.getElementById("tutorialTitle").textContent = title;
}
const layoutEl = document.getElementById("layout");
const speechPanel = document.querySelector(".speech-panel");
const codePanel = document.querySelector(".code-panel");
layoutEl.append(speechPanel, codePanel);
layoutEl.classList.add("layout--tb");
loadTutorial(tutorialFile);
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