Data commit

Task/ASCII-art-diagram-converter/JavaScript/ascii-art-diagram-converter.js

@@ -0,0 +1,101 @@
+// ------------------------------------------------------------[ Boilerplate ]--
+const trimWhitespace = s => s.trim();
+const isNotEmpty = s => s !== '';
+const stringLength = s => s.length;
+const hexToBin4 = s => parseInt(s, 16).toString(2).padStart(4, '0');
+const concatHexToBin = (binStr, hexStr) => binStr.concat('', hexToBin4(hexStr));
+const alignRight = n => s => `${s}`.padStart(n, ' ');
+const alignLeft = n => s => `${s}`.padEnd(n, ' ');
+const repeatChar = c => n => c.padStart(n, c);
+const joinWith = c => arr => arr.join(c);
+const joinNl = joinWith('\n');
+const joinSp = joinWith(' ');
+
+const printDiagramInfo = map => {
+  const pName = alignLeft(8);
+  const p5 = alignRight(5);
+  const line = repeatChar('-');
+  const res = [];
+  res.push(joinSp([pName('Name'), p5('Size'), p5('Start'), p5('End')]));
+  res.push(joinSp([line(8), line(5), line(5), line(5)]));
+  [...map.values()].forEach(({label, bitLength, start, end}) => {
+    res.push(joinSp([pName(label), p5(bitLength), p5(start), p5(end)]));
+  })
+  return res;
+}
+
+// -------------------------------------------------------------------[ Main ]--
+const parseDiagram = dia => {
+
+  const arr = dia.split('\n').map(trimWhitespace).filter(isNotEmpty);
+
+  const hLine = arr[0];
+  const bitTokens = hLine.split('+').map(trimWhitespace).filter(isNotEmpty);
+  const bitWidth = bitTokens.length;
+  const bitTokenWidth = bitTokens[0].length;
+
+  const fields = arr.filter(e => e !== hLine);
+  const allFields = fields.reduce((p, c) => [...p, ...c.split('|')], [])
+      .filter(isNotEmpty);
+
+  const lookupMap = Array(bitWidth).fill('').reduce((p, c, i) => {
+    const v = i + 1;
+    const stringWidth = (v * bitTokenWidth) + (v - 1);
+    p.set(stringWidth, v);
+    return p;
+  }, new Map())
+
+  const fieldMetaMap = allFields.reduce((p, e, i) => {
+    const bitLength = lookupMap.get(e.length);
+    const label = trimWhitespace(e);
+    const start = i ? p.get(i - 1).end + 1 : 0;
+    const end = start - 1 + bitLength;
+    p.set(i, {label, bitLength, start, end})
+    return p;
+  }, new Map());
+
+  const pName = alignLeft(8);
+  const pBit = alignRight(5);
+  const pPat = alignRight(18);
+  const line = repeatChar('-');
+  const nl = '\n';
+  return hexStr => {
+    const binString = [...hexStr].reduce(concatHexToBin, '');
+
+    const res = printDiagramInfo(fieldMetaMap);
+    res.unshift(joinNl(['Diagram:', ...arr, nl]));
+    res.push(joinNl([nl, 'Test string in hex:', hexStr]));
+    res.push(joinNl(['Test string in binary:', binString, nl]));
+    res.push(joinSp([pName('Name'), pBit('Size'), pPat('Pattern')]));
+    res.push(joinSp([line(8), line(5), line(18)]));
+
+    [...fieldMetaMap.values()].forEach(({label, bitLength, start, end}) => {
+      res.push(joinSp(
+          [pName(label), pBit(bitLength),
+            pPat(binString.substr(start, bitLength))]))
+    })
+    return joinNl(res);
+  }
+}
+
+// --------------------------------------------------------------[ Run tests ]--
+
+const dia = `
++--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+|                      ID                       |
++--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+|QR|   Opcode  |AA|TC|RD|RA|   Z    |   RCODE   |
++--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+|                    QDCOUNT                    |
++--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+|                    ANCOUNT                    |
++--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+|                    NSCOUNT                    |
++--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+|                    ARCOUNT                    |
++--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+`;
+
+const parser = parseDiagram(dia);
+
+parser('78477bbf5496e12e1bf169a4');