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import { formatters as expressionFormatters } from './expression-formatters.js'
import { isInteger } from '../utils/algorithms/number.utils.js'
/** @import {AST, Token} from './key-ast.util.js' */
/** @import {CaptureExpressionInfo, FormatCall as DefaultFormatter} from './capture-expression-values.js' */
/** @type { Readonly<never[]>} */
const emptyArray = Object.freeze([])
/**
* Add or replace format method from templateFormatter object
* @param {Omit<TemplateFormatter, 'format'>} templateFormatter - target TemplateFormatter object
* @returns {TemplateFormatter} TemplateFormatter object with updated `format` function
*/
const formatterWithFormat = (templateFormatter) => ({
...templateFormatter,
format: (parameters, locale, defaultFormatters) => {
const { strings, formatters } = templateFormatter
let result = strings[0]
for (let i = 1, e = strings.length; i < e; ++i) {
result += formatters[i - 1](parameters, locale, defaultFormatters) + strings[i]
}
return result
},
})
/**
* Returns a formatter that returns the `value` content
*
* Used when the value does not have parameters
* @param {string} value - value constant
* @returns {TemplateFormatter} resulting template formatter
*/
const formatSimpleKey = (value) => ({
strings: [value],
formatters: emptyArray,
format: () => value,
})
/**
* parse capture key token reducer
* @param {[string, CaptureExpressionsInfoDetail[]]} acc - accumulator
* @param {Token} token - capture child token
* @returns {[string, CaptureExpressionsInfoDetail[]]} updated accumulator
*/
function parseCaptureKeyToken (acc, token) {
const [currentExpression, fragmentedCaptureExpressionsInfo] = acc
switch (token.type) {
case states.capture_expr:
return [currentExpression ? `${currentExpression} ${token.text}` : token.text, fragmentedCaptureExpressionsInfo]
case states.capture_expr_sep: {
return ['', [...fragmentedCaptureExpressionsInfo, { type: 'expression', text: currentExpression }]]
}
case states.sq_string:
case states.dq_string:
case states.bt_string: {
/** @type {CaptureExpressionsInfoDetail} */
const info = { type: 'string', text: token.text.slice(1, token.text.length - 1) }
return [currentExpression, [...fragmentedCaptureExpressionsInfo, info]]
}
default:
console.error('error: invalid expression, ignoring...')
return acc
}
}
/**
* Parse capture key to ease usage in {@link getFormatterFromTokens}
* @param {Token} captureToken - target capture token
* @returns {CaptureExpressionsInfoDetail[]} parse result
*/
function parseCaptureKey (captureToken) {
const [currentExpression, fragmentedCaptureExpressionsInfo] = captureToken.childTokens.reduce(parseCaptureKeyToken, ['', []])
if (currentExpression) {
fragmentedCaptureExpressionsInfo.push({
type: 'expression',
text: currentExpression,
})
}
return fragmentedCaptureExpressionsInfo
}
/**
* Formatter to use for simple capture expressions (e.g. `{0}`)
* @type {FormatterReducer}
*/
function applyDefaultFormatter (acc) {
if (acc.defaultFormatters && typeof acc.position === 'number') {
return {
...acc,
result: acc.defaultFormatters[acc.position](acc.result, acc.locale),
}
}
return acc
}
/**
* @param {number} position - position to query
* @returns {FormatterReducer} built FormatterReducer
*/
const positionFormatter = (position) => (acc) => {
const { parameters } = acc
if (parameters.length <= position) {
return {
...acc,
result: '',
exit: true,
}
}
return {
...acc,
position,
result: parameters[position],
}
}
/**
*
* @param {FormatterReducer[]} fragmentedFormatters - list of formatter reducers
* @param {Strings} parameters - parameter list
* @param {Intl.Locale} locale - locale to format data
* @param {DefaultFormatters} [defaultFormatters] - default formatter
* @returns {string} format result
*/
const formatFromReducers = (fragmentedFormatters, parameters, locale, defaultFormatters = []) => {
/** @type {FormatterReducerAccumulator} */
let reducerAcc = {
parameters,
defaultFormatters,
result: '',
locale,
}
for (const fragmentedFormatter of fragmentedFormatters) {
if (reducerAcc.exit) {
return reducerAcc.result
}
reducerAcc = fragmentedFormatter(reducerAcc)
}
return reducerAcc.result
}
/**
* @param {CaptureExpressionsInfoDetail} detail - capture token
* @returns {FormatterReducer | null} - FormatterReducer or null if invalid
*/
function getFirstExpressionFormatterReducer (detail) {
if (detail.type === 'string') {
const { text } = detail
return (acc) => ({ ...acc, result: text })
} else if (isInteger(detail.text)) {
const position = +detail.text
return positionFormatter(position)
} else {
return null
}
}
const printNothing = () => ''
/**
* @param {Token} token - capture token
* @returns {Formatter} resulting formatter
*/
function getFormatterFromCaptureToken (token) {
const fragmentedCaptureExpressionsInfo = parseCaptureKey(token)
if (fragmentedCaptureExpressionsInfo.length === 0) { return printNothing }
const [firstInfo, ...restInfo] = fragmentedCaptureExpressionsInfo
const firstReducer = getFirstExpressionFormatterReducer(firstInfo)
if (!firstReducer) { return printNothing }
const fragmentedFormatters = [firstReducer]
for (const info of restInfo) {
const { text } = info
if (Object.hasOwn(expressionFormatters, text)) {
const formatter = expressionFormatters[text]
fragmentedFormatters.push((acc) => ({ ...acc, result: formatter.format(acc.result, acc.locale) }))
}
}
if (fragmentedFormatters.length <= 1) {
fragmentedFormatters.push(applyDefaultFormatter)
}
return (parameters, locale, defaultFormatters) => formatFromReducers(fragmentedFormatters, parameters, locale, defaultFormatters)
}
/**
* This is for the formatter to work the same way as a template string, it always end with a string even if is empty
* @param {Pick<TemplateFormatter, "strings"|"formatters">} params - building formatter
* @returns {Pick<TemplateFormatter, "strings"|"formatters">} formatter that ends with string
*/
function guaranteeFormatterEndsWithString (params) {
const { strings, formatters } = params
if (strings.length === formatters.length) {
return { strings: [...strings, ''], formatters }
}
return params
}
/**
* @param {AST} ast - AST of parsed value
* @returns {TemplateFormatter} resulting formatter
*/
export function getFormatter (ast) {
const { tokens } = ast
const captureTokens = tokens.filter((token) => token.type === states.capture)
if (captureTokens.length <= 0) {
const textToMatch = tokens.map((token) => token.text).join('')
return formatSimpleKey(textToMatch)
}
/** @type {string[]} */
const strings = []
/** @type {Formatter[]} */
const formatters = []
for (const keyToken of tokens) {
if (keyToken.type !== states.capture) {
strings.push(keyToken.text)
continue
}
formatters.push(getFormatterFromCaptureToken(keyToken))
}
return formatterWithFormat(guaranteeFormatterEndsWithString({ strings, formatters }))
}
/**
* @typedef {object} CaptureExpressionsInfoDetail
* @property {'expression' | 'string'} type - type of detail
* @property {string} text - detail text
*/
/**
* @typedef {object} FormatterReducerAccumulator
*
* Formatter reducer accumulator, used when piping in the result with an expression (e.g. `{0 | relative time}`)
* @property {Strings} parameters
* Parameters used in the i18n key, e.g. when translating "On 2023-01-01T20:00:00 I bought 10 fireworks"
* on key "On {date} I bought {number} fireworks", the parameters are going to be ["2023-01-01T20:00:00", "10"]
* @property {DefaultFormatters} defaultFormatters
* The default formatter to use for each parameter in `parameters`
* @property {string} result - The current result on accumulator, is the final result after passing all reducers
* @property {Intl.Locale} locale - Locale used when formatting the text
* @property {number} [position] - index of `parameters` to match text
* @property {boolean} [exit] - flag to exit early and use `result` as final result immediately, ignoring the rest of the reducers
*/
/**
* @callback FormatterReducer
* @param {FormatterReducerAccumulator} previous - reducer previous value
* @returns {FormatterReducerAccumulator} next value
*/
/**
* @callback Formatter
* A placeholder formatter
* @param {Strings} parameters -
* Placeholder parameters, the placeholder may be empty ({}), may contain one parameter that is a string ({"text"}) or a capture expression position ({ 0 })
* additional parameters allows to define how to convert the previous parameter result ({0 | relative time})
* @param {Intl.Locale} locale - locale to format
* @param {DefaultFormatters} [defaultFormatters] - default formatter
* @returns {string} formatted string
*/
/**
* @typedef {object} TemplateFormatter
* @property {Strings} strings - raw strings
* @property {Formatters} formatters - formatters of each capture token
* @property {(parameters: Strings, locale: Intl.Locale, defaultFormatters?: DefaultFormatters) => string} format - format function
*/
/** @typedef {Readonly<string[]>} Strings - raw string array, immutable */
/** @typedef {Readonly<Formatter[]>} Formatters - formatters of each capture token */
/** @typedef {Readonly<DefaultFormatter[]>} DefaultFormatters - default formatters of each capture token */
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