diff options
| -rw-r--r-- | src/util/wiki-data.js | 226 |
1 files changed, 134 insertions, 92 deletions
diff --git a/src/util/wiki-data.js b/src/util/wiki-data.js index f6368970..c477a6d8 100644 --- a/src/util/wiki-data.js +++ b/src/util/wiki-data.js @@ -119,96 +119,6 @@ export function normalizeName(s) { return s; } -// Component sort functions - these sort by one particular property, applying -// unique particulars where appropriate. Usually you don't want to use these -// directly, but if you're making a custom sort they can come in handy. - -// Universal method for sorting things into a predictable order, as directory -// is taken to be unique. There are two exceptions where this function (and -// thus any of the composite functions that start with it) *can't* be taken as -// deterministic: -// -// 1) Mixed data of two different Things, as directories are only taken as -// unique within one given class of Things. For example, this function -// won't be deterministic if its array contains both <album:ithaca> and -// <track:ithaca>. -// -// 2) Duplicate directories, or multiple instances of the "same" Thing. -// This function doesn't differentiate between two objects of the same -// directory, regardless of any other properties or the overall "identity" -// of the object. -// -// These exceptions are unavoidable except for not providing that kind of data -// in the first place, but you can still ensure the overall program output is -// deterministic by ensuring the input is arbitrarily sorted according to some -// other criteria - ex, although sortByDirectory itself isn't determinstic when -// given mixed track and album data, the final output (what goes on the site) -// will always be the same if you're doing sortByDirectory([...albumData, -// ...trackData]), because the initial sort places albums before tracks - and -// sortByDirectory will handle the rest, given all directories are unique -// except when album and track directories overlap with each other. -export function sortByDirectory(data, { - getDirectory = (o) => o.directory, -} = {}) { - return data.sort((a, b) => { - const ad = getDirectory(a); - const bd = getDirectory(b); - return compareCaseLessSensitive(ad, bd); - }); -} - -export function sortByName(data, { - getName = (o) => o.name, -} = {}) { - const nameMap = new Map(); - const normalizedNameMap = new Map(); - for (const o of data) { - const name = getName(o); - const normalizedName = normalizeName(name); - nameMap.set(o, name); - normalizedNameMap.set(o, normalizedName); - } - - return data.sort((a, b) => { - const ann = normalizedNameMap.get(a); - const bnn = normalizedNameMap.get(b); - const comparison = compareCaseLessSensitive(ann, bnn); - if (comparison !== 0) - return comparison; - - const an = nameMap.get(a); - const bn = nameMap.get(b); - return compareCaseLessSensitive(an, bn); - }); -} - -export function sortByDate(data, { - latestFirst = false, - getDate = (o) => o.date, -} = {}) { - return data.sort((a, b) => { - const ad = getDate(a); - const bd = getDate(b); - - // It's possible for objects with and without dates to be mixed - // together in the same array. If that's the case, we put all items - // without dates at the end. - if (ad && bd) { - return (latestFirst ? bd - ad : ad - bd); - } else if (ad) { - return -1; - } else if (bd) { - return 1; - } else { - // If neither of the items being compared have a date, don't move - // them relative to each other. This is basically the same as - // filtering out all non-date items and then pushing them at the - // end after sorting the rest. - return 0; - } - }); -} - // Sorts multiple arrays by an arbitrary function (which is the last argument). // Values from each array are paired: (a_fromFirstArray, b_fromFirstArray, // a_fromSecondArray, b_fromSecondArray), etc. This definitely only works if @@ -253,16 +163,148 @@ export function filterMultipleArrays(...args) { const fn = args.at(-1); const length = arrays[0].length; + const removed = new Array(length).fill(null).map(() => []); for (let i = length - 1; i >= 0; i--) { const args = arrays.map(array => array[i]); if (!fn(...args)) { - for (const array of arrays) { - array.splice(i, 1); + for (let j = 0; j < arrays.length; j++) { + const item = arrays[j][i]; + arrays[j].splice(i, 1); + removed[j].unshift(item); } } } + + Object.assign(arrays, {removed}); + return arrays; +} + +// Component sort functions - these sort by one particular property, applying +// unique particulars where appropriate. Usually you don't want to use these +// directly, but if you're making a custom sort they can come in handy. + +// Universal method for sorting things into a predictable order, as directory +// is taken to be unique. There are two exceptions where this function (and +// thus any of the composite functions that start with it) *can't* be taken as +// deterministic: +// +// 1) Mixed data of two different Things, as directories are only taken as +// unique within one given class of Things. For example, this function +// won't be deterministic if its array contains both <album:ithaca> and +// <track:ithaca>. +// +// 2) Duplicate directories, or multiple instances of the "same" Thing. +// This function doesn't differentiate between two objects of the same +// directory, regardless of any other properties or the overall "identity" +// of the object. +// +// These exceptions are unavoidable except for not providing that kind of data +// in the first place, but you can still ensure the overall program output is +// deterministic by ensuring the input is arbitrarily sorted according to some +// other criteria - ex, although sortByDirectory itself isn't determinstic when +// given mixed track and album data, the final output (what goes on the site) +// will always be the same if you're doing sortByDirectory([...albumData, +// ...trackData]), because the initial sort places albums before tracks - and +// sortByDirectory will handle the rest, given all directories are unique +// except when album and track directories overlap with each other. +export function sortByDirectory(data, { + getDirectory = object => object.directory, +} = {}) { + const directories = data.map(getDirectory); + + sortMultipleArrays(data, directories, + (a, b, directoryA, directoryB) => + compareCaseLessSensitive(directoryA, directoryB)); + + return data; +} + +export function sortByName(data, { + getName = object => object.name, +} = {}) { + const names = data.map(getName); + const normalizedNames = names.map(normalizeName); + + sortMultipleArrays(data, normalizedNames, names, + ( + a, b, + normalizedA, normalizedB, + nonNormalizedA, nonNormalizedB, + ) => + compareNormalizedNames( + normalizedA, normalizedB, + nonNormalizedA, nonNormalizedB, + )); + + return data; +} + +export function compareNormalizedNames( + normalizedA, normalizedB, + nonNormalizedA, nonNormalizedB, +) { + const comparison = compareCaseLessSensitive(normalizedA, normalizedB); + return ( + (comparison === 0 + ? compareCaseLessSensitive(nonNormalizedA, nonNormalizedB) + : comparison)); +} + +export function sortByDate(data, { + getDate = object => object.date, + latestFirst = false, +} = {}) { + const dates = data.map(getDate); + + sortMultipleArrays(data, dates, + (a, b, dateA, dateB) => + compareDates(dateA, dateB, {latestFirst})); + + return data; +} + +export function compareDates(a, b, { + latestFirst = false, +} = {}) { + if (a && b) { + return (latestFirst ? b - a : a - b); + } + + // It's possible for objects with and without dates to be mixed + // together in the same array. If that's the case, we put all items + // without dates at the end. + if (a) return -1; + if (b) return 1; + + // If neither of the items being compared have a date, don't move + // them relative to each other. This is basically the same as + // filtering out all non-date items and then pushing them at the + // end after sorting the rest. + return 0; +} + +export function getLatestDate(dates) { + const filtered = dates.filter(Boolean); + if (empty(filtered)) return null; + + return filtered + .reduce( + (accumulator, date) => + date > accumulator ? date : accumulator, + -Infinity); +} + +export function getEarliestDate(dates) { + const filtered = dates.filter(Boolean); + if (empty(filtered)) return null; + + return filtered + .reduce( + (accumulator, date) => + date < accumulator ? date : accumulator, + Infinity); } // Funky sort which takes a data set and a corresponding list of "counts", |