107 lines
2.7 KiB
JavaScript
107 lines
2.7 KiB
JavaScript
export default function parseAbsence(str, teacherMap) {
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const LAST_HOUR = 10;
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const s = (str ?? "").trim().replace(/\s+/g, " ");
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const result = {
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teacher: null, // String or null
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teacherCode: null, // String or null
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type: null, // "wholeDay" | "range" | "single" | "invalid"
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hours: null // { from, to } or number
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};
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if (!s) {
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result.type = "invalid";
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result.original = s;
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return result;
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}
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const isTeacher = (t) => /^[A-Za-z]+$/.test(t);
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const parseSpec = (spec) => {
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let m;
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// "5+" -> range 5..LAST_HOUR
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if ((m = spec.match(/^(\d+)\+$/))) {
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const from = parseInt(m[1], 10);
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if (from >= 1 && from <= LAST_HOUR) {
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return { kind: "range", value: { from, to: LAST_HOUR } };
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}
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return null;
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}
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// "5-7" -> range 5..7
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if ((m = spec.match(/^(\d+)-(\d+)$/))) {
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const from = parseInt(m[1], 10);
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const to = parseInt(m[2], 10);
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if (from >= 1 && to >= 1 && from <= to && to <= LAST_HOUR) {
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return { kind: "range", value: { from, to } };
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}
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return null;
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}
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// "5" -> single 5
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if ((m = spec.match(/^(\d+)$/))) {
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const hour = parseInt(m[1], 10);
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if (hour >= 1 && hour <= LAST_HOUR) {
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return { kind: "single", value: hour };
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}
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return null;
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}
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return null;
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};
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const parts = s.split(" ");
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if (parts.length === 1) {
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const t = parts[0];
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if (isTeacher(t)) {
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result.teacherCode = t;
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result.teacher = teacherMap?.[t.toLowerCase()] ?? null;
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result.type = "wholeDay";
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return result;
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}
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result.type = "invalid";
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result.original = s;
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return result;
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}
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if (parts.length === 2) {
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const [a, b] = parts;
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// Teacher first: "Nm 5", "Nm 5-7", "Nm 5+"
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if (isTeacher(a)) {
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const spec = parseSpec(b);
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if (!spec) {
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result.type = "invalid";
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result.original = s;
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return result;
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}
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result.teacherCode = a;
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result.teacher = teacherMap?.[a.toLowerCase()] ?? null;
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result.type = spec.kind === "range" ? "range" : "single";
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result.hours = spec.value;
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return result;
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}
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// Teacher last: "5 Nm", "5-7 Nm", "5+ Nm"
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if (isTeacher(b)) {
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const spec = parseSpec(a);
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if (!spec) {
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result.type = "invalid";
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result.original = s;
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return result;
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}
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result.teacherCode = b;
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result.teacher = teacherMap?.[b.toLowerCase()] ?? null;
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result.type = spec.kind === "range" ? "range" : "single";
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result.hours = spec.value;
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return result;
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}
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result.type = "invalid";
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result.original = s;
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return result;
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}
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// Anything else is invalid
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result.type = "invalid";
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result.original = s;
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return result;
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}
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