@igo2/utils
Version:
115 lines • 19.2 kB
JavaScript
export class StringUtils {
static diff(s1, s2, p = 4) {
if (!s1 && !s2) {
return '';
}
if (!s1) {
return '<span class="inserted">' + s2 + '</span>';
}
if (!s2) {
return '<span class="deleted">' + s1 + '</span>';
}
s1 = s1.toString();
s2 = s2.toString();
const changeData = StringUtils.getChanges(s1, s2, '', p);
const nextS = s2.slice(changeData.mtc.length + changeData.ins.length + changeData.sbs.length); // remaining part of "s"
const nextThis = s1.slice(changeData.mtc.length + changeData.del.length + changeData.sbs.length); // remaining part of "this"
let result = ''; // the glorious result
if (changeData.del.length > 0) {
changeData.del = '<span class="deleted">' + changeData.del + '</span>';
}
if (changeData.ins.length > 0) {
changeData.ins = '<span class="inserted">' + changeData.ins + '</span>';
}
result = changeData.mtc + changeData.del + changeData.ins + changeData.sbs;
result +=
nextThis !== '' || nextS !== ''
? StringUtils.diff(nextThis, nextS, p)
: '';
return result;
}
static getMatchingSubstring(s, l, m) {
// returns the first matching substring in-between the two strings
let i = 0;
let match = false;
const slen = s.length;
const o = { fis: slen, mtc: m, sbs: '' }; // temporary object used to construct the cd (change data) object
while (i < slen) {
// eslint-disable-next-line @typescript-eslint/no-unused-expressions
l[i] === s[i]
? match
? (o.sbs += s[i]) // o.sbs holds the matching substring itsef
: ((match = true), (o.fis = i), (o.sbs = s[i]))
: match
? (i = slen) // stop after the first found substring
: // eslint-disable-next-line no-self-assign
(i = i);
++i;
}
return o;
}
static getChanges(s1, s2, m, p) {
const isThisLonger = s1.length >= s1.length ? true : false;
let [longer, shorter] = isThisLonger ? [s1, s2] : [s2, s1]; // assignment of longer and shorter by es6 destructuring
let bi = 0; // base index designating the index of first mismacthing character in both strings
while (shorter[bi] === longer[bi] && bi < shorter.length) {
++bi;
} // make bi the index of first mismatching character
longer = longer.split('').slice(bi); // as the longer string will be rotated it is converted into array
shorter = shorter.slice(bi); // shorter and longer now starts from the first mismatching character
const len = longer.length; // length of the longer string
let cd = {
fis: shorter.length, // the index of matching string in the shorter string
fil: len, // the index of matching string in the longer string
sbs: '', // the matching substring itself
mtc: m + s2.slice(0, bi)
}; // if exists mtc holds the matching string at the front
let sub = { sbs: '' }; // returned substring per 1 character rotation of the longer string
if (shorter !== '') {
for (let rc = 0; rc < len && sub.sbs.length < p; rc++) {
// rc -> rotate count, p -> precision factor
sub = StringUtils.getMatchingSubstring(shorter, StringUtils.rotateArray(longer, rc), cd.mtc); // rotate longer string 1 char and get substring
sub.fil =
rc < len - sub.fis
? sub.fis + rc // mismatch is longer than the mismatch in short
: sub.fis - len + rc; // mismatch is shorter than the mismatch in short
if (sub.sbs.length > cd.sbs.length) {
cd = sub; // only keep the one with the longest substring.
}
}
}
// insert the mismatching delete subsrt and insert substr to the cd object and attach the previous substring
[cd.del, cd.ins] = isThisLonger
? [longer.slice(0, cd.fil).join(''), shorter.slice(0, cd.fis)]
: [shorter.slice(0, cd.fis), longer.slice(0, cd.fil).join('')];
return cd.del.indexOf(' ') === -1 ||
cd.ins.indexOf(' ') === -1 ||
cd.del === '' ||
cd.ins === '' ||
cd.sbs === ''
? cd
: StringUtils.getChanges(cd.del, cd.ins, cd.mtc, p);
}
static rotateArray(array, n) {
const len = array.length;
const res = new Array(array.length);
if (n % len === 0) {
return array.slice();
}
else {
for (let i = 0; i < len; i++) {
res[i] = array[(i + (len + (n % len))) % len];
}
}
return res;
}
static isValidNumber(value) {
return !isNaN(Number(value));
}
static isOctalNumber(value) {
return (StringUtils.isValidNumber(value) &&
value.startsWith('0') &&
value.length > 1);
}
}
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class StringUtils {\n  static diff(s1: string, s2: string, p = 4): string {\n    if (!s1 && !s2) {\n      return '';\n    }\n    if (!s1) {\n      return '<span class=\"inserted\">' + s2 + '</span>';\n    }\n    if (!s2) {\n      return '<span class=\"deleted\">' + s1 + '</span>';\n    }\n    s1 = s1.toString();\n    s2 = s2.toString();\n    const changeData = StringUtils.getChanges(s1, s2, '', p);\n    const nextS = s2.slice(\n      changeData.mtc.length + changeData.ins.length + changeData.sbs.length\n    ); // remaining part of \"s\"\n    const nextThis = s1.slice(\n      changeData.mtc.length + changeData.del.length + changeData.sbs.length\n    ); // remaining part of \"this\"\n    let result = ''; // the glorious result\n    if (changeData.del.length > 0) {\n      changeData.del = '<span class=\"deleted\">' + changeData.del + '</span>';\n    }\n    if (changeData.ins.length > 0) {\n      changeData.ins = '<span class=\"inserted\">' + changeData.ins + '</span>';\n    }\n    result = changeData.mtc + changeData.del + changeData.ins + changeData.sbs;\n    result +=\n      nextThis !== '' || nextS !== ''\n        ? StringUtils.diff(nextThis, nextS, p)\n        : '';\n    return result;\n  }\n\n  private static getMatchingSubstring(s, l, m) {\n    // returns the first matching substring in-between the two strings\n    let i = 0;\n    let match = false;\n    const slen = s.length;\n    const o = { fis: slen, mtc: m, sbs: '' }; // temporary object used to construct the cd (change data) object\n\n    while (i < slen) {\n      // eslint-disable-next-line @typescript-eslint/no-unused-expressions\n      l[i] === s[i]\n        ? match\n          ? (o.sbs += s[i]) // o.sbs holds the matching substring itsef\n          : ((match = true), (o.fis = i), (o.sbs = s[i]))\n        : match\n          ? (i = slen) // stop after the first found substring\n          : // eslint-disable-next-line no-self-assign\n            (i = i);\n      ++i;\n    }\n    return o;\n  }\n\n  private static getChanges(s1, s2, m, p) {\n    const isThisLonger = s1.length >= s1.length ? true : false;\n    let [longer, shorter] = isThisLonger ? [s1, s2] : [s2, s1]; // assignment of longer and shorter by es6 destructuring\n    let bi = 0; // base index designating the index of first mismacthing character in both strings\n\n    while (shorter[bi] === longer[bi] && bi < shorter.length) {\n      ++bi;\n    } // make bi the index of first mismatching character\n    longer = longer.split('').slice(bi); // as the longer string will be rotated it is converted into array\n    shorter = shorter.slice(bi); // shorter and longer now starts from the first mismatching character\n\n    const len = longer.length; // length of the longer string\n    let cd: any = {\n      fis: shorter.length, // the index of matching string in the shorter string\n      fil: len, // the index of matching string in the longer string\n      sbs: '', // the matching substring itself\n      mtc: m + s2.slice(0, bi)\n    }; // if exists mtc holds the matching string at the front\n    let sub: any = { sbs: '' }; // returned substring per 1 character rotation of the longer string\n\n    if (shorter !== '') {\n      for (let rc = 0; rc < len && sub.sbs.length < p; rc++) {\n        // rc -> rotate count, p -> precision factor\n        sub = StringUtils.getMatchingSubstring(\n          shorter,\n          StringUtils.rotateArray(longer, rc),\n          cd.mtc\n        ); // rotate longer string 1 char and get substring\n        sub.fil =\n          rc < len - sub.fis\n            ? sub.fis + rc // mismatch is longer than the mismatch in short\n            : sub.fis - len + rc; // mismatch is shorter than the mismatch in short\n        if (sub.sbs.length > cd.sbs.length) {\n          cd = sub; // only keep the one with the longest substring.\n        }\n      }\n    }\n    // insert the mismatching delete subsrt and insert substr to the cd object and attach the previous substring\n    [cd.del, cd.ins] = isThisLonger\n      ? [longer.slice(0, cd.fil).join(''), shorter.slice(0, cd.fis)]\n      : [shorter.slice(0, cd.fis), longer.slice(0, cd.fil).join('')];\n    return cd.del.indexOf(' ') === -1 ||\n      cd.ins.indexOf(' ') === -1 ||\n      cd.del === '' ||\n      cd.ins === '' ||\n      cd.sbs === ''\n      ? cd\n      : StringUtils.getChanges(cd.del, cd.ins, cd.mtc, p);\n  }\n\n  private static rotateArray(array, n) {\n    const len = array.length;\n    const res = new Array(array.length);\n    if (n % len === 0) {\n      return array.slice();\n    } else {\n      for (let i = 0; i < len; i++) {\n        res[i] = array[(i + (len + (n % len))) % len];\n      }\n    }\n    return res;\n  }\n\n  static isValidNumber(value: string): boolean {\n    return !isNaN(Number(value));\n  }\n\n  static isOctalNumber(value: string): boolean {\n    return (\n      StringUtils.isValidNumber(value) &&\n      value.startsWith('0') &&\n      value.length > 1\n    );\n  }\n}\n"]}