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printer.ts
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printer.ts
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import {NumberSkeletonToken} from '@formatjs/icu-skeleton-parser'
import {
MessageFormatElement,
isLiteralElement,
LiteralElement,
ArgumentElement,
DateElement,
TimeElement,
NumberElement,
SelectElement,
PluralElement,
TagElement,
isTagElement,
isSelectElement,
isArgumentElement,
isDateElement,
isTimeElement,
isNumberElement,
isPluralElement,
TYPE,
Skeleton,
SKELETON_TYPE,
DateTimeSkeleton,
isPoundElement,
} from './types'
export function printAST(ast: MessageFormatElement[]): string {
return doPrintAST(ast, false)
}
export function doPrintAST(
ast: MessageFormatElement[],
isInPlural: boolean
): string {
const printedNodes = ast.map((el, i) => {
if (isLiteralElement(el)) {
return printLiteralElement(el, isInPlural, i === 0, i === ast.length - 1)
}
if (isArgumentElement(el)) {
return printArgumentElement(el)
}
if (isDateElement(el) || isTimeElement(el) || isNumberElement(el)) {
return printSimpleFormatElement(el)
}
if (isPluralElement(el)) {
return printPluralElement(el)
}
if (isSelectElement(el)) {
return printSelectElement(el)
}
if (isPoundElement(el)) {
return '#'
}
if (isTagElement(el)) {
return printTagElement(el)
}
})
return printedNodes.join('')
}
function printTagElement(el: TagElement): string {
return `<${el.value}>${printAST(el.children)}</${el.value}>`
}
function printEscapedMessage(message: string): string {
return message.replace(/([{}](?:.*[{}])?)/su, `'$1'`)
}
function printLiteralElement(
{value}: LiteralElement,
isInPlural: boolean,
isFirstEl: boolean,
isLastEl: boolean
) {
let escaped = value
// If this literal starts with a ' and its not the 1st node, this means the node before it is non-literal
// and the `'` needs to be unescaped
if (!isFirstEl && escaped[0] === `'`) {
escaped = `''${escaped.slice(1)}`
}
// Same logic but for last el
if (!isLastEl && escaped[escaped.length - 1] === `'`) {
escaped = `${escaped.slice(0, escaped.length - 1)}''`
}
escaped = printEscapedMessage(escaped)
return isInPlural ? escaped.replace('#', "'#'") : escaped
}
function printArgumentElement({value}: ArgumentElement) {
return `{${value}}`
}
function printSimpleFormatElement(
el: DateElement | TimeElement | NumberElement
) {
return `{${el.value}, ${TYPE[el.type]}${
el.style ? `, ${printArgumentStyle(el.style)}` : ''
}}`
}
function printNumberSkeletonToken(token: NumberSkeletonToken): string {
const {stem, options} = token
return options.length === 0
? stem
: `${stem}${options.map(o => `/${o}`).join('')}`
}
function printArgumentStyle(style: string | Skeleton) {
if (typeof style === 'string') {
return printEscapedMessage(style)
} else if (style.type === SKELETON_TYPE.dateTime) {
return `::${printDateTimeSkeleton(style)}`
} else {
return `::${style.tokens.map(printNumberSkeletonToken).join(' ')}`
}
}
export function printDateTimeSkeleton(style: DateTimeSkeleton): string {
return style.pattern
}
function printSelectElement(el: SelectElement) {
const msg = [
el.value,
'select',
Object.keys(el.options)
.map(id => `${id}{${doPrintAST(el.options[id].value, false)}}`)
.join(' '),
].join(',')
return `{${msg}}`
}
function printPluralElement(el: PluralElement) {
const type = el.pluralType === 'cardinal' ? 'plural' : 'selectordinal'
const msg = [
el.value,
type,
[
el.offset ? `offset:${el.offset}` : '',
...Object.keys(el.options).map(
id => `${id}{${doPrintAST(el.options[id].value, true)}}`
),
]
.filter(Boolean)
.join(' '),
].join(',')
return `{${msg}}`
}