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import { EasingKey, EasingObject, isEasingKey, TweenState } from './types'
declare module './tweenable' {
interface Tweenable {
/**
* @ignore
*/
_tokenData?: FormatSignature
}
}
interface FormatSignature {
[propertyName: string]: {
formatString: string
chunkNames: string[]
}
}
type PropertyChunks = { [chunkName: string]: string | number }
const R_NUMBER_COMPONENT = /(\d|-|\.)/
const R_FORMAT_CHUNKS = /([^\-0-9.]+)/g
const R_UNFORMATTED_VALUES = /[0-9.-]+/g
const R_RGBA = (() => {
const number = R_UNFORMATTED_VALUES.source
const comma = /,\s*/.source
return new RegExp(
`rgba?\\(${number}${comma}${number}${comma}${number}(${comma}${number})?\\)`,
'g'
)
})()
const R_RGBA_PREFIX = /^.*\(/
const R_HEX = /#([0-9]|[a-f]){3,6}/gi
const VALUE_PLACEHOLDER = 'VAL'
const getFormatChunksFrom = (
rawValues: number[],
prefix: string
): Array<string> => rawValues.map((_val, i) => `_${prefix}_${i}`)
const getFormatStringFrom = (formattedString: string): string => {
let chunks = formattedString.match(R_FORMAT_CHUNKS)
if (!chunks) {
// chunks will be null if there were no tokens to parse in
// formattedString (for example, if formattedString is '2'). Coerce
// chunks to be useful here.
chunks = ['', '']
// If there is only one chunk, assume that the string is a number
// followed by a token...
// NOTE: This may be an unwise assumption.
} else if (
chunks.length === 1 ||
// ...or if the string starts with a number component (".", "-", or a
// digit)...
formattedString.charAt(0).match(R_NUMBER_COMPONENT)
) {
// ...prepend an empty string here to make sure that the formatted number
// is properly replaced by VALUE_PLACEHOLDER
chunks.unshift('')
}
return chunks.join(VALUE_PLACEHOLDER)
}
/**
* Convert a base-16 number to base-10.
*/
function hexToDec(hex: string): number {
return parseInt(hex, 16)
}
/**
* Convert a hexadecimal string to an array with three items, one each for
* the red, blue, and green decimal values.
*/
const hexToRGBArray = (
/**
* A hexadecimal string.
*/
hex: string
): /**
* The converted Array of RGB values if `hex` is a valid string, or an Array of
* three 0's.
*/
Array<number> => {
hex = hex.replace(/#/, '')
// If the string is a shorthand three digit hex notation, normalize it to
// the standard six digit notation
if (hex.length === 3) {
const [r, g, b] = hex.split('')
hex = r + r + g + g + b + b
}
return [
hexToDec(hex.substring(0, 2)),
hexToDec(hex.substring(2, 4)),
hexToDec(hex.substring(4, 6)),
]
}
const convertHexToRGB = (hexString: string): string =>
`rgb(${hexToRGBArray(hexString).join(',')})`
/**
* TODO: Can this be rewritten to leverage String#replace more efficiently?
* Runs a filter operation on all chunks of a string that match a RegExp.
*/
const filterStringChunks = (
pattern: RegExp,
unfilteredString: string,
filter: (filter: string) => string
): string => {
const patternMatches = unfilteredString.match(pattern)
let filteredString = unfilteredString.replace(pattern, VALUE_PLACEHOLDER)
if (patternMatches) {
patternMatches.forEach(
match =>
(filteredString = filteredString.replace(
VALUE_PLACEHOLDER,
filter(match)
))
)
}
return filteredString
}
const sanitizeHexChunksToRGB = (str: string): string =>
filterStringChunks(R_HEX, str, convertHexToRGB)
/**
* Convert all hex color values within a string to an rgb string.
*/
const sanitizeObjectForHexProps = (stateObject: TweenState) => {
for (const prop in stateObject) {
const currentProp = stateObject[prop]
if (typeof currentProp === 'string' && currentProp.match(R_HEX)) {
stateObject[prop] = sanitizeHexChunksToRGB(currentProp)
}
}
}
const sanitizeRGBAChunk = (rgbChunk: string): string => {
const rgbaRawValues = rgbChunk.match(R_UNFORMATTED_VALUES) ?? []
const rgbNumbers = rgbaRawValues
.slice(0, 3)
.map(rgbChunk => Math.floor(Number(rgbChunk)))
const prefix = rgbChunk.match(R_RGBA_PREFIX)?.[0]
if (rgbaRawValues.length === 3) {
return `${prefix}${rgbNumbers.join(',')})`
} else Eif (rgbaRawValues.length === 4) {
return `${prefix}${rgbNumbers.join(',')},${rgbaRawValues[3]})`
}
throw new Error(`Invalid rgbChunk: ${rgbChunk}`)
}
/**
* Check for floating point values within rgb strings and round them.
*/
const sanitizeRGBChunks = (formattedString: string): string =>
filterStringChunks(R_RGBA, formattedString, sanitizeRGBAChunk)
/**
* NOTE: It's the duty of the caller to convert the Array elements of the
* return value into numbers. This is a performance optimization.
*/
const getValuesFrom = (formattedString: string): Array<string> =>
formattedString.match(R_UNFORMATTED_VALUES) ?? []
const getFormatSignatures = (stateObject: TweenState): FormatSignature => {
const signatures: FormatSignature = {}
for (const propertyName in stateObject) {
const property = stateObject[propertyName]
if (typeof property === 'string') {
signatures[propertyName] = {
formatString: getFormatStringFrom(property),
chunkNames: getFormatChunksFrom(
getValuesFrom(property)?.map(Number),
propertyName
),
}
}
}
return signatures
}
const expandFormattedProperties = (
stateObject: TweenState,
formatSignatures: FormatSignature
) => {
for (const propertyName in formatSignatures) {
getValuesFrom(String(stateObject[propertyName])).forEach(
(number, i) =>
(stateObject[formatSignatures[propertyName].chunkNames[i]] = +number)
)
delete stateObject[propertyName]
}
}
const extractPropertyChunks = (
stateObject: TweenState,
chunkNames: string[]
): PropertyChunks => {
const extractedValues: PropertyChunks = {}
chunkNames.forEach(chunkName => {
extractedValues[chunkName] = stateObject[chunkName]
delete stateObject[chunkName]
})
return extractedValues
}
const getValuesList = (
stateObject: TweenState,
chunkNames: Array<string>
): Array<number> => chunkNames.map(chunkName => Number(stateObject[chunkName]))
const getFormattedValues = (
formatString: string,
rawValues: Array<number>
): string => {
rawValues.forEach(
rawValue =>
(formatString = formatString.replace(
VALUE_PLACEHOLDER,
String(+rawValue.toFixed(4))
))
)
return formatString
}
const collapseFormattedProperties = (
stateObject: TweenState,
formatSignature: FormatSignature
) => {
for (const prop in formatSignature) {
const { chunkNames, formatString } = formatSignature[prop]
const currentProp = getFormattedValues(
formatString,
getValuesList(extractPropertyChunks(stateObject, chunkNames), chunkNames)
)
stateObject[prop] = sanitizeRGBChunks(currentProp)
}
}
const expandEasingObject = (
easingObject: EasingObject,
formatSignature: FormatSignature
) => {
for (const prop in formatSignature) {
const { chunkNames } = formatSignature[prop]
const easing = easingObject[prop]
if (typeof easing === 'string') {
const easingNames = easing.split(' ')
const defaultEasing = easingNames[easingNames.length - 1]
for (let i = 0; i < chunkNames.length; i++) {
const chunkName = chunkNames[i]
const easingName = easingNames[i] ?? defaultEasing
Eif (isEasingKey(easingName)) {
easingObject[chunkName] = easingName
}
}
} else {
// easing is a function
chunkNames.forEach(chunkName => (easingObject[chunkName] = easing))
}
delete easingObject[prop]
}
}
const collapseEasingObject = (
easingObject: EasingObject,
formatSignature: FormatSignature
) => {
for (const prop in formatSignature) {
const { chunkNames } = formatSignature[prop]
const firstEasing = easingObject[chunkNames[0]]
if (typeof firstEasing === 'string') {
easingObject[prop] = chunkNames
.map(chunkName => {
const easingName = easingObject[chunkName]
delete easingObject[chunkName]
return easingName
})
// This typecast isn't accurate, but the logic works and it's performant.
//
// TODO: In a future major version, drop support for a single string
// containing a space-separated list of EasingKeys and add support for an
// Array of EasingKeys.
.join(' ') as EasingKey
} else {
// firstEasing is a function
easingObject[prop] = firstEasing
}
}
}
export const doesApply = (tweenable: Tweenable): boolean => {
for (const key in tweenable._currentState) {
if (typeof tweenable._currentState[key] === 'string') {
return true
}
}
return false
}
export function tweenCreated(tweenable: Tweenable) {
const { _currentState, _originalState, _targetState } = tweenable
;[_currentState, _originalState, _targetState].forEach(
sanitizeObjectForHexProps
)
tweenable._tokenData = getFormatSignatures(_currentState)
}
export function beforeTween(tweenable: Tweenable) {
const {
_currentState,
_originalState,
_targetState,
_easing,
_tokenData,
} = tweenable
Eif (typeof _easing !== 'function' && _tokenData) {
expandEasingObject(_easing, _tokenData)
}
// eslint-disable-next-line @typescript-eslint/no-extra-semi
;[_currentState, _originalState, _targetState].forEach(state =>
expandFormattedProperties(state, _tokenData ?? {})
)
}
export function afterTween(tweenable: Tweenable) {
const {
_currentState,
_originalState,
_targetState,
_easing,
_tokenData,
} = tweenable
;[_currentState, _originalState, _targetState].forEach(state =>
collapseFormattedProperties(state, _tokenData ?? {})
)
Eif (typeof _easing !== 'function' && _tokenData) {
collapseEasingObject(_easing, _tokenData)
}
}
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