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import { escape } from '../utils/algorithms/regex.utils.js'
import { captureExpressions } from './capture-expression-values.js'
const falsePredicate = () => false
/** @type {Readonly<[]> } */
const emptyArray = Object.freeze([])
/** @type {ParameterMatchResult} */
const anyMatchExpression = Object.freeze({
isMatch: true,
expressionInfo: captureExpressions.special.any,
})
const noMatchExpression = Object.freeze({
isMatch: false,
})
const anyMatchCaptureExpressionsInfo = {
matchPredicate: () => anyMatchExpression,
}
/** @type {MatchResult} */
const noMatch = Object.freeze({
isMatch: false,
parameters: emptyArray,
defaultFormatters: emptyArray,
})
/** @type {MatchResult} */
const emptyYesMatch = Object.freeze({
isMatch: true,
parameters: emptyArray,
defaultFormatters: emptyArray,
})
/**
* @param {string} textToMatch - target text to match
* @returns {Matcher} - match result
*/
const exactStringMatcher = (textToMatch) => (text) => (textToMatch === text) ? emptyYesMatch : noMatch
/**
* @param {CaptureExpressionsInfoDetail[]} details - target details
* @returns {CaptureExpressionInfo} expression info from details
*/
const captureExpressionInfoFromDetails = (details) => ({
matchPredicate: (text) => {
for (const expressionPart of details) {
if (expressionPart.matches(text)) {
return {
isMatch: true,
expressionInfo: expressionPart.expressionInfo,
}
}
}
return noMatchExpression
},
})
/**
* @param {import('./key-ast.util.js').Token} captureToken - capture token from AST of parsed key
* @returns {CaptureExpressionInfo} its respective expression info
*/
function captureExpressionInfoFromToken (captureToken) {
if (captureToken.childTokens.length === 0) {
return anyMatchCaptureExpressionsInfo
}
/** @type {CaptureExpressionsInfoDetail[]} */
const fragmentedCaptureExpressionsInfo = []
let currentExpression = ''
for (const token of captureToken.childTokens) {
switch (token.type) {
case states.capture_expr:
currentExpression = currentExpression ? `${currentExpression} ${token.text}` : token.text
continue
case states.capture_expr_sep:
fragmentedCaptureExpressionsInfo.push({
type: 'expression',
text: currentExpression,
expressionInfo: captureExpressions.named[currentExpression],
matches: captureExpressions.named[currentExpression]?.matchPredicate() ?? falsePredicate,
})
currentExpression = ''
continue
case states.regex:
fragmentedCaptureExpressionsInfo.push({
type: 'regex',
text: token.text,
expressionInfo: captureExpressions.special.regex,
matches: captureExpressions.special.regex.matchPredicate(token.text.slice(1, -1)),
})
continue
case states.sq_string:
case states.dq_string:
case states.bt_string:
fragmentedCaptureExpressionsInfo.push({
type: 'string',
text: token.text,
expressionInfo: captureExpressions.special.string,
matches: captureExpressions.special.string.matchPredicate(token.text),
})
continue
}
}
if (currentExpression) {
fragmentedCaptureExpressionsInfo.push({
type: 'expression',
text: currentExpression,
expressionInfo: captureExpressions.named[currentExpression],
matches: captureExpressions.named[currentExpression]?.matchPredicate() ?? falsePredicate,
})
}
return captureExpressionInfoFromDetails(fragmentedCaptureExpressionsInfo)
}
/**
* @param {RegExp} regex - used to validate for `text` match
* @param {CaptureExpressionInfo[]} captureExpressionsInfo - to validate each capture token match
* @returns {Matcher} matcher function
*/
const expressionMatcher = (regex, captureExpressionsInfo) => (text) => {
if (typeof text !== 'string') return noMatch
const matches = text.match(regex)
if (matches == null) {
return noMatch
}
const parameters = matches.slice(1)
const paramMatchInfo = []
for (const [index, text] of parameters.entries()) {
const matchResult = captureExpressionsInfo[index].matchPredicate(text)
if (!matchResult.isMatch) {
return noMatch
}
paramMatchInfo.push(matchResult.expressionInfo)
}
const defaultFormatters = paramMatchInfo.map((info) => info.defaultFormat)
return {
isMatch: true,
parameters,
defaultFormatters,
}
}
/**
* @param {import('./key-ast.util.js').Token[]} tokens - tokens from AST of parsed key
* @returns {Matcher} matcher function
*/
function getMatcherFromTokens (tokens) {
const captureTokens = tokens.filter((token) => token.type === states.capture)
if (captureTokens.length <= 0) {
const textToMatch = tokens.map((token) => token.text).join('')
return exactStringMatcher(textToMatch)
}
const captureExpressionsInfo = captureTokens.map(captureExpressionInfoFromToken)
const regexStr = tokens.map((token) => token.type === states.capture ? '(.*)' : escape(token.text)).join('')
const regex = new RegExp('^' + regexStr + '$')
return expressionMatcher(regex, captureExpressionsInfo)
}
/**
*
* @param {import('./key-ast.util.js').AST} ast - AST of parsed key
* @returns {Matcher} matcher function
*/
export function getMatcher (ast) {
return getMatcherFromTokens(ast.tokens)
}
/**
* @typedef {object} CaptureExpressionInfo
* @property { (text: string) => ParameterMatchResult} matchPredicate - match predicate
*/
/**
* @typedef {object} CaptureExpressionsInfoDetail
* @property {'expression' | 'regex' | 'string' | 'any'} type - detail type
* @property {string} text - respective text
* @property {import('./capture-expression-values.js').CaptureExpressionInfo} expressionInfo - capture expression information
* @property {(text: string) => boolean} matches - predicate that verifies if `text` matches the defined `expressionInfo`
*/
/**
* @typedef {(text: string, locale: Intl.Locale) => string} Formatter
*/
/**
* @typedef {Readonly<{ isMatch: false } | {isMatch: true, expressionInfo: import('./capture-expression-values.js').CaptureExpressionInfo}>} ParameterMatchResult
*/
/**
* @typedef {(text: string) => MatchResult} Matcher
*/
/**
* @typedef {object} MatchResult
* @property {boolean} isMatch - indicates if the text matches i18n key
* @property {Readonly<string[]>} parameters - captured parameter text list
* @property {Readonly<Formatter[]>} defaultFormatters - default formatters of parsed i18n key
*/
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