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export type TaskAssignmentData = {
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id: string,
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name: string,
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points: number | null,
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description: string,
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titleHtml: string
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}
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type TaskLocation = {
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/** Relative location of HTML file containing this task */
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url: string
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/** id of the element where the specific task begins */
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startElement: string
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}
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function getLocation(id: string, solution: boolean): TaskLocation | null {
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const m = /^(\d+)-(Z?)(\d)-(\d)$/.exec(id)
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if (!m) return null
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const [_, rocnik, z, serie, uloha] = m
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if (z == 'Z') {
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const urlX = solution ? "reseni" : "zadani"
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return {
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url: `z/ulohy/${rocnik}/${urlX}${serie}.html`,
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startElement: `task-${id}`
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}
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} else {
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const urlX = solution ? "solution" : "tasks"
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return {
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url: `tasks/${rocnik}/${urlX}${serie}.html`,
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startElement: `task-${id}`
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}
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}
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}
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function parseTask(startElementId: string, html: string): TaskAssignmentData {
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const parser = new DOMParser()
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const doc = parser.parseFromString(html, "text/html")
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const titleElement = doc.getElementById(startElementId)
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if (!titleElement)
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throw new Error(`Document does not contain ${startElementId}`)
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const elements = []
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let e = titleElement
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const titleMatch = /(\d-Z?\d+-\d+) (.*?)( \((\d+) bod.*\))?/.exec(e.innerText.trim())
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if (!titleMatch) {
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var [_, id, name, _, points] = ["", startElementId, "Neznámé jméno úlohy", "", ""]
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} else {
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var [_, id, name, _, points] = titleMatch
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}
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while (e.nextElementSibling &&
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e.nextElementSibling?.tagName.toLowerCase() == "hr")
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e = e.nextElementSibling as HTMLElement
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while (!e.classList.contains("story") &&
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// !e.classList.contains("clearfloat") &&
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e.tagName.toLowerCase() != "h3" &&
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e.innerText.trim() != "Řešení"
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)
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{
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elements.push(e)
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if (!e.nextElementSibling) break;
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e = e.nextElementSibling as HTMLElement
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}
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let r = ""
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for (const e of elements)
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r += e.outerHTML + "\n"
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return {
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description: r,
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id: id.trim(),
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name: name.trim(),
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points: points ? +points : null,
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titleHtml: titleElement.outerHTML
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}
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}
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async function loadTask({ url, startElement }: TaskLocation) {
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const r = await fetch(url, { headers: { "Accept": "text/html,application/xhtml+xml" } })
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if (r.status >= 400) {
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throw Error("Bad request")
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}
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const rText = await r.text()
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return parseTask(startElement, rText)
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}
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function virtualTask(id: string): TaskAssignmentData {
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return {
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id,
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description: "úloha je virtuální a neexistuje",
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name: id,
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points: 0,
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titleHtml: "<h3>Virtuální úloha</h3>"
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}
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}
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export async function grabAssignment(id: string): Promise<TaskAssignmentData> {
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const l = getLocation(id, false)
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if (!l) return virtualTask(id)
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return await loadTask(l)
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}
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export async function grabSolution(id: string): Promise<TaskAssignmentData> {
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const l = getLocation(id, true)
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if (!l) return virtualTask(id)
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return await loadTask(l)
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}
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