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import {load} from 'cheerio';
import {ILecture} from './ILecture';
interface IBlock {
title: string;
durationHours: number;
durationSlots: number;
info: string;
room: string;
lecturer: string
}
export class SplusParser {
private readonly startHour = 7;
private readonly $: CheerioStatic;
private readonly $table: Cheerio;
private readonly $rows: Cheerio;
private colWidths: number[] = [];
private colBlocked: number[] = [];
private blocks: IBlock[][][] = [];
constructor(data: string) {
this.$ = load(data);
this.$table = this.$(this.$('table.grid-border-args')[0]);
this.$rows = this.$table.find('> tbody > tr');
this.parseColWidths();
this.parseTable();
}
getLectures(): ILecture[] {
let lectures: ILecture[] = [];
for (let i = 0; i < this.blocks.length; i++) {
const begin = this.startHour + i * 0.25;
const slot = this.blocks[i];
for (let j = 0; j < slot.length; j++) {
const day = slot[j];
for (let k = 0; k < day.length; k++) {
const block = day[k];
const lecture = {
title: block.title,
day: j,
begin: begin,
end: begin + block.durationHours,
info: block.info,
room: block.room,
lecturer: block.lecturer
};
lectures.push(lecture);
}
}
}
return lectures;
}
private getDay(col: number) {
return this.colWidths.findIndex(width => (col -= width) < 0);
}
private parseColWidths() {
const $cols = this.$(this.$rows[0]).find('td:not(:first-child)');
for (let i = 0; i < $cols.length; i++) {
const $col = this.$($cols[i]);
this.colWidths[i] = parseInt($col.attr('colspan'));
}
let index = 0;
for (let i = 0; i < this.colWidths.length; i++) {
for (let j = 0; j < this.colWidths[i]; i++) {
this.colBlocked[index++] = 0;
}
}
}
private parseTable() {
for (let i = 0; i < this.$rows.length - 1; i++) {
// i + 1 to skip the columns row
const $row = this.$(this.$rows[i + 1]);
this.colBlocked = this.colBlocked.map(v => v > 0 ? v - 1 : 0);
this.blocks.push(this.parseRow($row));
}
}
private parseRow($row: Cheerio) {
const $cols = $row.find('> td:not(:first-child)');
const blocks: IBlock[][] = [];
let offset = 0;
for (let i = 0; i < $cols.length; i++) {
while (this.colBlocked[i + offset] > 0) {
const day = this.getDay(i + offset);
if (blocks[day] === undefined) {
blocks[day] = [];
}
offset++;
}
const day = this.getDay(i + offset);
if (blocks[day] === undefined) {
blocks[day] = [];
}
const $c = this.$($cols[i]);
if ($c.hasClass('object-cell-border')) {
const block = this.parseBlock($c);
blocks[day].push(block);
this.colBlocked[i + offset] = block.durationSlots;
}
}
return blocks;
}
private parseBlock($block: Cheerio): IBlock {
const $tblTitle = $block.find('table:nth-child(1)');
const $tblInfo = $block.find('table:nth-child(2)');
const $tblLocation = $block.find('table:nth-child(3)');
const $tdRoom = $tblLocation.find('td:nth-child(1)');
const $tdLecturer = $tblLocation.find('td:nth-child(2)');
// Remove the Modulhandbuch "mhb" link
$tblTitle.find('br + strong').remove();
const slots = parseInt($block.attr('rowspan'));
return {
title: $tblTitle.text().trim(),
durationHours: slots / 4,
durationSlots: slots,
info: $tblInfo.text().trim(),
room: $tdRoom.text().trim(),
lecturer: $tdLecturer.text().trim()
};
}
}
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