diff options
Diffstat (limited to 'src/data/composite/data')
| -rw-r--r-- | src/data/composite/data/excludeFromList.js | 55 | ||||
| -rw-r--r-- | src/data/composite/data/fillMissingListItems.js | 50 | ||||
| -rw-r--r-- | src/data/composite/data/index.js | 17 | ||||
| -rw-r--r-- | src/data/composite/data/withFilteredList.js | 50 | ||||
| -rw-r--r-- | src/data/composite/data/withFlattenedList.js | 47 | ||||
| -rw-r--r-- | src/data/composite/data/withMappedList.js | 39 | ||||
| -rw-r--r-- | src/data/composite/data/withPropertiesFromList.js | 92 | ||||
| -rw-r--r-- | src/data/composite/data/withPropertiesFromObject.js | 87 | ||||
| -rw-r--r-- | src/data/composite/data/withPropertyFromList.js | 82 | ||||
| -rw-r--r-- | src/data/composite/data/withPropertyFromObject.js | 69 | ||||
| -rw-r--r-- | src/data/composite/data/withSortedList.js | 121 | ||||
| -rw-r--r-- | src/data/composite/data/withUnflattenedList.js | 72 | ||||
| -rw-r--r-- | src/data/composite/data/withUniqueItemsOnly.js | 40 |
13 files changed, 821 insertions, 0 deletions
diff --git a/src/data/composite/data/excludeFromList.js b/src/data/composite/data/excludeFromList.js new file mode 100644 index 0000000..d798dcd --- /dev/null +++ b/src/data/composite/data/excludeFromList.js @@ -0,0 +1,55 @@ +// Filters particular values out of a list. Note that this will always +// completely skip over null, but can be used to filter out any other +// primitive or object value. +// +// See also: +// - fillMissingListItems +// +// More list utilities: +// - withFilteredList, withMappedList, withSortedList +// - withFlattenedList, withUnflattenedList +// - withPropertyFromList, withPropertiesFromList +// + +import {input, templateCompositeFrom} from '#composite'; +import {empty} from '#sugar'; + +export default templateCompositeFrom({ + annotation: `excludeFromList`, + + inputs: { + list: input(), + + item: input({defaultValue: null}), + items: input({type: 'array', defaultValue: null}), + }, + + outputs: ({ + [input.staticDependency('list')]: list, + }) => [list ?? '#list'], + + steps: () => [ + { + dependencies: [ + input.staticDependency('list'), + input('list'), + input('item'), + input('items'), + ], + + compute: (continuation, { + [input.staticDependency('list')]: listName, + [input('list')]: listContents, + [input('item')]: excludeItem, + [input('items')]: excludeItems, + }) => continuation({ + [listName ?? '#list']: + listContents.filter(item => { + if (excludeItem !== null && item === excludeItem) return false; + if (!empty(excludeItems) && excludeItems.includes(item)) return false; + return true; + }), + }), + }, + ], +}); diff --git a/src/data/composite/data/fillMissingListItems.js b/src/data/composite/data/fillMissingListItems.js new file mode 100644 index 0000000..4f818a7 --- /dev/null +++ b/src/data/composite/data/fillMissingListItems.js @@ -0,0 +1,50 @@ +// Replaces items of a list, which are null or undefined, with some fallback +// value. By default, this replaces the passed dependency. +// +// See also: +// - excludeFromList +// +// More list utilities: +// - withFilteredList, withMappedList, withSortedList +// - withFlattenedList, withUnflattenedList +// - withPropertyFromList, withPropertiesFromList +// + +import {input, templateCompositeFrom} from '#composite'; + +export default templateCompositeFrom({ + annotation: `fillMissingListItems`, + + inputs: { + list: input({type: 'array'}), + fill: input({acceptsNull: true}), + }, + + outputs: ({ + [input.staticDependency('list')]: list, + }) => [list ?? '#list'], + + steps: () => [ + { + dependencies: [input('list'), input('fill')], + compute: (continuation, { + [input('list')]: list, + [input('fill')]: fill, + }) => continuation({ + ['#filled']: + list.map(item => item ?? fill), + }), + }, + + { + dependencies: [input.staticDependency('list'), '#filled'], + compute: (continuation, { + [input.staticDependency('list')]: list, + ['#filled']: filled, + }) => continuation({ + [list ?? '#list']: + filled, + }), + }, + ], +}); diff --git a/src/data/composite/data/index.js b/src/data/composite/data/index.js new file mode 100644 index 0000000..256c049 --- /dev/null +++ b/src/data/composite/data/index.js @@ -0,0 +1,17 @@ +// #composite/data +// +// Entries here may depend on entries in #composite/control-flow. +// + +export {default as excludeFromList} from './excludeFromList.js'; +export {default as fillMissingListItems} from './fillMissingListItems.js'; +export {default as withFilteredList} from './withFilteredList.js'; +export {default as withFlattenedList} from './withFlattenedList.js'; +export {default as withMappedList} from './withMappedList.js'; +export {default as withPropertiesFromList} from './withPropertiesFromList.js'; +export {default as withPropertiesFromObject} from './withPropertiesFromObject.js'; +export {default as withPropertyFromList} from './withPropertyFromList.js'; +export {default as withPropertyFromObject} from './withPropertyFromObject.js'; +export {default as withSortedList} from './withSortedList.js'; +export {default as withUnflattenedList} from './withUnflattenedList.js'; +export {default as withUniqueItemsOnly} from './withUniqueItemsOnly.js'; diff --git a/src/data/composite/data/withFilteredList.js b/src/data/composite/data/withFilteredList.js new file mode 100644 index 0000000..82e5690 --- /dev/null +++ b/src/data/composite/data/withFilteredList.js @@ -0,0 +1,50 @@ +// Applies a filter - an array of truthy and falsy values - to the index- +// corresponding items in a list. Items which correspond to a truthy value +// are kept, and the rest are excluded from the output list. +// +// TODO: It would be neat to apply an availability check here, e.g. to allow +// not providing a filter at all and performing the check on the contents of +// the list (though on the filter, if present, is fine too). But that's best +// done by some shmancy-fancy mapping support in composite.js, so a bit out +// of reach for now (apart from proving uses built on top of a more boring +// implementation). +// +// TODO: There should be two outputs - one for the items included according to +// the filter, and one for the items excluded. +// +// See also: +// - withMappedList +// - withSortedList +// +// More list utilities: +// - excludeFromList +// - fillMissingListItems +// - withFlattenedList, withUnflattenedList +// - withPropertyFromList, withPropertiesFromList +// + +import {input, templateCompositeFrom} from '#composite'; + +export default templateCompositeFrom({ + annotation: `withFilteredList`, + + inputs: { + list: input({type: 'array'}), + filter: input({type: 'array'}), + }, + + outputs: ['#filteredList'], + + steps: () => [ + { + dependencies: [input('list'), input('filter')], + compute: (continuation, { + [input('list')]: list, + [input('filter')]: filter, + }) => continuation({ + '#filteredList': + list.filter((item, index) => filter[index]), + }), + }, + ], +}); diff --git a/src/data/composite/data/withFlattenedList.js b/src/data/composite/data/withFlattenedList.js new file mode 100644 index 0000000..edfa340 --- /dev/null +++ b/src/data/composite/data/withFlattenedList.js @@ -0,0 +1,47 @@ +// Flattens an array with one level of nested arrays, providing as dependencies +// both the flattened array as well as the original starting indices of each +// successive source array. +// +// See also: +// - withUnflattenedList +// +// More list utilities: +// - excludeFromList +// - fillMissingListItems +// - withFilteredList, withMappedList, withSortedList +// - withPropertyFromList, withPropertiesFromList +// + +import {input, templateCompositeFrom} from '#composite'; + +export default templateCompositeFrom({ + annotation: `withFlattenedList`, + + inputs: { + list: input({type: 'array'}), + }, + + outputs: ['#flattenedList', '#flattenedIndices'], + + steps: () => [ + { + dependencies: [input('list')], + compute(continuation, { + [input('list')]: sourceList, + }) { + const flattenedList = sourceList.flat(); + const indices = []; + let lastEndIndex = 0; + for (const {length} of sourceList) { + indices.push(lastEndIndex); + lastEndIndex += length; + } + + return continuation({ + ['#flattenedList']: flattenedList, + ['#flattenedIndices']: indices, + }); + }, + }, + ], +}); diff --git a/src/data/composite/data/withMappedList.js b/src/data/composite/data/withMappedList.js new file mode 100644 index 0000000..e0a700b --- /dev/null +++ b/src/data/composite/data/withMappedList.js @@ -0,0 +1,39 @@ +// Applies a map function to each item in a list, just like a normal JavaScript +// map. +// +// See also: +// - withFilteredList +// - withSortedList +// +// More list utilities: +// - excludeFromList +// - fillMissingListItems +// - withFlattenedList, withUnflattenedList +// - withPropertyFromList, withPropertiesFromList +// + +import {input, templateCompositeFrom} from '#composite'; + +export default templateCompositeFrom({ + annotation: `withMappedList`, + + inputs: { + list: input({type: 'array'}), + map: input({type: 'function'}), + }, + + outputs: ['#mappedList'], + + steps: () => [ + { + dependencies: [input('list'), input('map')], + compute: (continuation, { + [input('list')]: list, + [input('map')]: mapFn, + }) => continuation({ + ['#mappedList']: + list.map(mapFn), + }), + }, + ], +}); diff --git a/src/data/composite/data/withPropertiesFromList.js b/src/data/composite/data/withPropertiesFromList.js new file mode 100644 index 0000000..08907ba --- /dev/null +++ b/src/data/composite/data/withPropertiesFromList.js @@ -0,0 +1,92 @@ +// Gets the listed properties from each of a list of objects, providing lists +// of property values each into a dependency prefixed with the same name as the +// list (by default). +// +// Like withPropertyFromList, this doesn't alter indices. +// +// See also: +// - withPropertiesFromObject +// - withPropertyFromList +// +// More list utilities: +// - excludeFromList +// - fillMissingListItems +// - withFilteredList, withMappedList, withSortedList +// - withFlattenedList, withUnflattenedList +// + +import {input, templateCompositeFrom} from '#composite'; +import {isString, validateArrayItems} from '#validators'; + +export default templateCompositeFrom({ + annotation: `withPropertiesFromList`, + + inputs: { + list: input({type: 'array'}), + + properties: input({ + validate: validateArrayItems(isString), + }), + + prefix: input.staticValue({type: 'string', defaultValue: null}), + }, + + outputs: ({ + [input.staticDependency('list')]: list, + [input.staticValue('properties')]: properties, + [input.staticValue('prefix')]: prefix, + }) => + (properties + ? properties.map(property => + (prefix + ? `${prefix}.${property}` + : list + ? `${list}.${property}` + : `#list.${property}`)) + : ['#lists']), + + steps: () => [ + { + dependencies: [input('list'), input('properties')], + compute: (continuation, { + [input('list')]: list, + [input('properties')]: properties, + }) => continuation({ + ['#lists']: + Object.fromEntries( + properties.map(property => [ + property, + list.map(item => item[property] ?? null), + ])), + }), + }, + + { + dependencies: [ + input.staticDependency('list'), + input.staticValue('properties'), + input.staticValue('prefix'), + '#lists', + ], + + compute: (continuation, { + [input.staticDependency('list')]: list, + [input.staticValue('properties')]: properties, + [input.staticValue('prefix')]: prefix, + ['#lists']: lists, + }) => + (properties + ? continuation( + Object.fromEntries( + properties.map(property => [ + (prefix + ? `${prefix}.${property}` + : list + ? `${list}.${property}` + : `#list.${property}`), + lists[property], + ]))) + : continuation({'#lists': lists})), + }, + ], +}); diff --git a/src/data/composite/data/withPropertiesFromObject.js b/src/data/composite/data/withPropertiesFromObject.js new file mode 100644 index 0000000..21726b5 --- /dev/null +++ b/src/data/composite/data/withPropertiesFromObject.js @@ -0,0 +1,87 @@ +// Gets the listed properties from some object, providing each property's value +// as a dependency prefixed with the same name as the object (by default). +// If the object itself is null, all provided dependencies will be null; +// if it's missing only select properties, those will be provided as null. +// +// See also: +// - withPropertiesFromList +// - withPropertyFromObject +// + +import {input, templateCompositeFrom} from '#composite'; +import {isString, validateArrayItems} from '#validators'; + +export default templateCompositeFrom({ + annotation: `withPropertiesFromObject`, + + inputs: { + object: input({type: 'object', acceptsNull: true}), + + properties: input({ + type: 'array', + validate: validateArrayItems(isString), + }), + + prefix: input.staticValue({type: 'string', defaultValue: null}), + }, + + outputs: ({ + [input.staticDependency('object')]: object, + [input.staticValue('properties')]: properties, + [input.staticValue('prefix')]: prefix, + }) => + (properties + ? properties.map(property => + (prefix + ? `${prefix}.${property}` + : object + ? `${object}.${property}` + : `#object.${property}`)) + : ['#object']), + + steps: () => [ + { + dependencies: [input('object'), input('properties')], + compute: (continuation, { + [input('object')]: object, + [input('properties')]: properties, + }) => continuation({ + ['#entries']: + (object === null + ? properties.map(property => [property, null]) + : properties.map(property => [property, object[property]])), + }), + }, + + { + dependencies: [ + input.staticDependency('object'), + input.staticValue('properties'), + input.staticValue('prefix'), + '#entries', + ], + + compute: (continuation, { + [input.staticDependency('object')]: object, + [input.staticValue('properties')]: properties, + [input.staticValue('prefix')]: prefix, + ['#entries']: entries, + }) => + (properties + ? continuation( + Object.fromEntries( + entries.map(([property, value]) => [ + (prefix + ? `${prefix}.${property}` + : object + ? `${object}.${property}` + : `#object.${property}`), + value ?? null, + ]))) + : continuation({ + ['#object']: + Object.fromEntries(entries), + })), + }, + ], +}); diff --git a/src/data/composite/data/withPropertyFromList.js b/src/data/composite/data/withPropertyFromList.js new file mode 100644 index 0000000..a2c66d7 --- /dev/null +++ b/src/data/composite/data/withPropertyFromList.js @@ -0,0 +1,82 @@ +// Gets a property from each of a list of objects (in a dependency) and +// provides the results. +// +// This doesn't alter any list indices, so positions which were null in the +// original list are kept null here. Objects which don't have the specified +// property are retained in-place as null. +// +// See also: +// - withPropertiesFromList +// - withPropertyFromObject +// +// More list utilities: +// - excludeFromList +// - fillMissingListItems +// - withFilteredList, withMappedList, withSortedList +// - withFlattenedList, withUnflattenedList +// + +import {input, templateCompositeFrom} from '#composite'; + +function getOutputName({list, property, prefix}) { + if (!property) return `#values`; + if (prefix) return `${prefix}.${property}`; + if (list) return `${list}.${property}`; + return `#list.${property}`; +} + +export default templateCompositeFrom({ + annotation: `withPropertyFromList`, + + inputs: { + list: input({type: 'array'}), + property: input({type: 'string'}), + prefix: input.staticValue({type: 'string', defaultValue: null}), + }, + + outputs: ({ + [input.staticDependency('list')]: list, + [input.staticValue('property')]: property, + [input.staticValue('prefix')]: prefix, + }) => + [getOutputName({list, property, prefix})], + + steps: () => [ + { + dependencies: [input('list'), input('property')], + compute: (continuation, { + [input('list')]: list, + [input('property')]: property, + }) => continuation({ + ['#values']: + list.map(item => item[property] ?? null), + }), + }, + + { + dependencies: [ + input.staticDependency('list'), + input.staticValue('property'), + input.staticValue('prefix'), + ], + + compute: (continuation, { + [input.staticDependency('list')]: list, + [input.staticValue('property')]: property, + [input.staticValue('prefix')]: prefix, + }) => continuation({ + ['#outputName']: + getOutputName({list, property, prefix}), + }), + }, + + { + dependencies: ['#values', '#outputName'], + compute: (continuation, { + ['#values']: values, + ['#outputName']: outputName, + }) => + continuation.raiseOutput({[outputName]: values}), + }, + ], +}); diff --git a/src/data/composite/data/withPropertyFromObject.js b/src/data/composite/data/withPropertyFromObject.js new file mode 100644 index 0000000..b31bab1 --- /dev/null +++ b/src/data/composite/data/withPropertyFromObject.js @@ -0,0 +1,69 @@ +// Gets a property of some object (in a dependency) and provides that value. +// If the object itself is null, or the object doesn't have the listed property, +// the provided dependency will also be null. +// +// See also: +// - withPropertiesFromObject +// - withPropertyFromList +// + +import {input, templateCompositeFrom} from '#composite'; + +export default templateCompositeFrom({ + annotation: `withPropertyFromObject`, + + inputs: { + object: input({type: 'object', acceptsNull: true}), + property: input({type: 'string'}), + }, + + outputs: ({ + [input.staticDependency('object')]: object, + [input.staticValue('property')]: property, + }) => + (object && property + ? (object.startsWith('#') + ? [`${object}.${property}`] + : [`#${object}.${property}`]) + : ['#value']), + + steps: () => [ + { + dependencies: [ + input.staticDependency('object'), + input.staticValue('property'), + ], + + compute: (continuation, { + [input.staticDependency('object')]: object, + [input.staticValue('property')]: property, + }) => continuation({ + '#output': + (object && property + ? (object.startsWith('#') + ? `${object}.${property}` + : `#${object}.${property}`) + : '#value'), + }), + }, + + { + dependencies: [ + '#output', + input('object'), + input('property'), + ], + + compute: (continuation, { + ['#output']: output, + [input('object')]: object, + [input('property')]: property, + }) => continuation({ + [output]: + (object === null + ? null + : object[property] ?? null), + }), + }, + ], +}); diff --git a/src/data/composite/data/withSortedList.js b/src/data/composite/data/withSortedList.js new file mode 100644 index 0000000..dd81078 --- /dev/null +++ b/src/data/composite/data/withSortedList.js @@ -0,0 +1,121 @@ +// Applies a sort function across pairs of items in a list, just like a normal +// JavaScript sort. Alongside the sorted results, so are outputted the indices +// which each item in the unsorted list corresponds to in the sorted one, +// allowing for the results of this sort to be composed in some more involved +// operation. For example, using an alphabetical sort, the list ['banana', +// 'apple', 'pterodactyl'] will output the expected alphabetical items, as well +// as the indices list [1, 0, 2]. +// +// If two items are equal (in the eyes of the sort operation), their placement +// in the sorted list is arbitrary, though every input index will be present in +// '#sortIndices' exactly once (and equal items will be bunched together). +// +// The '#sortIndices' output refers to the "true" index which each source item +// occupies in the sorted list. This sacrifices information about equal items, +// which can be obtained through '#unstableSortIndices' instead: each mapped +// index may appear more than once, and rather than represent exact positions +// in the sorted list, they represent relational values: if items A and B are +// mapped to indices 3 and 5, then A certainly is positioned before B (and vice +// versa); but there may be more than one item in-between. If items C and D are +// both mapped to index 4, then their position relative to each other is +// arbitrary - they are equal - but they both certainly appear after item A and +// before item B. +// +// This implementation is based on the one used for sortMultipleArrays. +// +// See also: +// - withFilteredList +// - withMappedList +// +// More list utilities: +// - excludeFromList +// - fillMissingListItems +// - withFlattenedList, withUnflattenedList +// - withPropertyFromList, withPropertiesFromList +// + +import {input, templateCompositeFrom} from '#composite'; + +export default templateCompositeFrom({ + annotation: `withSortedList`, + + inputs: { + list: input({type: 'array'}), + sort: input({type: 'function'}), + }, + + outputs: ['#sortedList', '#sortIndices', '#unstableSortIndices'], + + steps: () => [ + { + dependencies: [input('list'), input('sort')], + compute(continuation, { + [input('list')]: list, + [input('sort')]: sortFn, + }) { + const symbols = []; + const symbolToIndex = new Map(); + + for (const index of list.keys()) { + const symbol = Symbol(); + symbols.push(symbol); + symbolToIndex.set(symbol, index); + } + + const equalSymbols = new Map(); + + const assertEqual = (symbol1, symbol2) => { + if (equalSymbols.has(symbol1)) { + equalSymbols.get(symbol1).add(symbol2); + } else { + equalSymbols.set(symbol1, new Set([symbol2])); + } + }; + + const isEqual = (symbol1, symbol2) => + !!equalSymbols.get(symbol1)?.has(symbol2); + + symbols.sort((symbol1, symbol2) => { + const comparison = + sortFn( + list[symbolToIndex.get(symbol1)], + list[symbolToIndex.get(symbol2)]); + + if (comparison === 0) { + assertEqual(symbol1, symbol2); + assertEqual(symbol2, symbol1); + } + + return comparison; + }); + + const stableSortIndices = []; + const unstableSortIndices = []; + const sortedList = []; + + let unstableIndex = 0; + + for (const [stableIndex, symbol] of symbols.entries()) { + const sourceIndex = symbolToIndex.get(symbol); + sortedList.push(list[sourceIndex]); + + if (stableIndex > 0) { + const previous = symbols[stableIndex - 1]; + if (!isEqual(symbol, previous)) { + unstableIndex++; + } + } + + stableSortIndices[sourceIndex] = stableIndex; + unstableSortIndices[sourceIndex] = unstableIndex; + } + + return continuation({ + ['#sortedList']: sortedList, + ['#sortIndices']: stableSortIndices, + ['#unstableSortIndices']: unstableSortIndices, + }); + }, + }, + ], +}); diff --git a/src/data/composite/data/withUnflattenedList.js b/src/data/composite/data/withUnflattenedList.js new file mode 100644 index 0000000..39a666d --- /dev/null +++ b/src/data/composite/data/withUnflattenedList.js @@ -0,0 +1,72 @@ +// After mapping the contents of a flattened array in-place (being careful to +// retain the original indices by replacing unmatched results with null instead +// of filtering them out), this function allows for recombining them. It will +// filter out null and undefined items by default (pass {filter: false} to +// disable this). +// +// See also: +// - withFlattenedList +// +// More list utilities: +// - excludeFromList +// - fillMissingListItems +// - withFilteredList, withMappedList, withSortedList +// - withPropertyFromList, withPropertiesFromList +// + +import {input, templateCompositeFrom} from '#composite'; +import {isWholeNumber, validateArrayItems} from '#validators'; + +export default templateCompositeFrom({ + annotation: `withUnflattenedList`, + + inputs: { + list: input({ + type: 'array', + defaultDependency: '#flattenedList', + }), + + indices: input({ + validate: validateArrayItems(isWholeNumber), + defaultDependency: '#flattenedIndices', + }), + + filter: input({ + type: 'boolean', + defaultValue: true, + }), + }, + + outputs: ['#unflattenedList'], + + steps: () => [ + { + dependencies: [input('list'), input('indices'), input('filter')], + compute(continuation, { + [input('list')]: list, + [input('indices')]: indices, + [input('filter')]: filter, + }) { + const unflattenedList = []; + + for (let i = 0; i < indices.length; i++) { + const startIndex = indices[i]; + const endIndex = + (i === indices.length - 1 + ? list.length + : indices[i + 1]); + + const values = list.slice(startIndex, endIndex); + unflattenedList.push( + (filter + ? values.filter(value => value !== null && value !== undefined) + : values)); + } + + return continuation({ + ['#unflattenedList']: unflattenedList, + }); + }, + }, + ], +}); diff --git a/src/data/composite/data/withUniqueItemsOnly.js b/src/data/composite/data/withUniqueItemsOnly.js new file mode 100644 index 0000000..7ee08b0 --- /dev/null +++ b/src/data/composite/data/withUniqueItemsOnly.js @@ -0,0 +1,40 @@ +// Excludes duplicate items from a list and provides the results, overwriting +// the list in-place, if possible. + +import {input, templateCompositeFrom} from '#composite'; +import {unique} from '#sugar'; + +export default templateCompositeFrom({ + annotation: `withUniqueItemsOnly`, + + inputs: { + list: input({type: 'array'}), + }, + + outputs: ({ + [input.staticDependency('list')]: list, + }) => [list ?? '#uniqueItems'], + + steps: () => [ + { + dependencies: [input('list')], + compute: (continuation, { + [input('list')]: list, + }) => continuation({ + ['#values']: + unique(list), + }), + }, + + { + dependencies: ['#values', input.staticDependency('list')], + compute: (continuation, { + '#values': values, + [input.staticDependency('list')]: list, + }) => continuation({ + [list ?? '#uniqueItems']: + values, + }), + }, + ], +}); |