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import { convertNumberSkeletonToNumberFormatOptions, isArgumentElement, isDateElement, isDateTimeSkeleton, isLiteralElement, isNumberElement, isNumberSkeleton, isPluralElement, isPoundElement, isSelectElement, isTimeElement, parseDateTimeSkeleton, isTagElement, } from 'intl-messageformat-parser';
import { MissingValueError, InvalidValueError, FormatError, InvalidValueTypeError, } from './error';
export var PART_TYPE;
(function (PART_TYPE) {
    PART_TYPE[PART_TYPE["literal"] = 0] = "literal";
    PART_TYPE[PART_TYPE["object"] = 1] = "object";
})(PART_TYPE || (PART_TYPE = {}));
function mergeLiteral(parts) {
    if (parts.length < 2) {
        return parts;
    }
    return parts.reduce(function (all, part) {
        var lastPart = all[all.length - 1];
        if (!lastPart ||
            lastPart.type !== 0 /* literal */ ||
            part.type !== 0 /* literal */) {
            all.push(part);
        }
        else {
            lastPart.value += part.value;
        }
        return all;
    }, []);
}
function isFormatXMLElementFn(el) {
    return typeof el === 'function';
}
// TODO(skeleton): add skeleton support
export function formatToParts(els, locales, formatters, formats, values, currentPluralValue, 
// For debugging
originalMessage) {
    // Hot path for straight simple msg translations
    if (els.length === 1 && isLiteralElement(els[0])) {
        return [
            {
                type: 0 /* literal */,
                value: els[0].value,
            },
        ];
    }
    var result = [];
    for (var _i = 0, els_1 = els; _i < els_1.length; _i++) {
        var el = els_1[_i];
        // Exit early for string parts.
        if (isLiteralElement(el)) {
            result.push({
                type: 0 /* literal */,
                value: el.value,
            });
            continue;
        }
        // TODO: should this part be literal type?
        // Replace `#` in plural rules with the actual numeric value.
        if (isPoundElement(el)) {
            if (typeof currentPluralValue === 'number') {
                result.push({
                    type: 0 /* literal */,
                    value: formatters.getNumberFormat(locales).format(currentPluralValue),
                });
            }
            continue;
        }
        var varName = el.value;
        // Enforce that all required values are provided by the caller.
        if (!(values && varName in values)) {
            throw new MissingValueError(varName, originalMessage);
        }
        var value = values[varName];
        if (isArgumentElement(el)) {
            if (!value || typeof value === 'string' || typeof value === 'number') {
                value =
                    typeof value === 'string' || typeof value === 'number'
                        ? String(value)
                        : '';
            }
            result.push({
                type: typeof value === 'string' ? 0 /* literal */ : 1 /* object */,
                value: value,
            });
            continue;
        }
        // Recursively format plural and select parts' option — which can be a
        // nested pattern structure. The choosing of the option to use is
        // abstracted-by and delegated-to the part helper object.
        if (isDateElement(el)) {
            var style = typeof el.style === 'string'
                ? formats.date[el.style]
                : isDateTimeSkeleton(el.style)
                    ? parseDateTimeSkeleton(el.style.pattern)
                    : undefined;
            result.push({
                type: 0 /* literal */,
                value: formatters
                    .getDateTimeFormat(locales, style)
                    .format(value),
            });
            continue;
        }
        if (isTimeElement(el)) {
            var style = typeof el.style === 'string'
                ? formats.time[el.style]
                : isDateTimeSkeleton(el.style)
                    ? parseDateTimeSkeleton(el.style.pattern)
                    : undefined;
            result.push({
                type: 0 /* literal */,
                value: formatters
                    .getDateTimeFormat(locales, style)
                    .format(value),
            });
            continue;
        }
        if (isNumberElement(el)) {
            var style = typeof el.style === 'string'
                ? formats.number[el.style]
                : isNumberSkeleton(el.style)
                    ? convertNumberSkeletonToNumberFormatOptions(el.style.tokens)
                    : undefined;
            result.push({
                type: 0 /* literal */,
                value: formatters
                    .getNumberFormat(locales, style)
                    .format(value),
            });
            continue;
        }
        if (isTagElement(el)) {
            var children = el.children, value_1 = el.value;
            var formatFn = values[value_1];
            if (!isFormatXMLElementFn(formatFn)) {
                throw new InvalidValueTypeError(value_1, 'function', originalMessage);
            }
            var parts = formatToParts(children, locales, formatters, formats, values, currentPluralValue);
            var chunks = formatFn.apply(void 0, parts.map(function (p) { return p.value; }));
            if (!Array.isArray(chunks)) {
                chunks = [chunks];
            }
            result.push.apply(result, chunks.map(function (c) {
                return {
                    type: typeof c === 'string' ? 0 /* literal */ : 1 /* object */,
                    value: c,
                };
            }));
        }
        if (isSelectElement(el)) {
            var opt = el.options[value] || el.options.other;
            if (!opt) {
                throw new InvalidValueError(el.value, value, Object.keys(el.options), originalMessage);
            }
            result.push.apply(result, formatToParts(opt.value, locales, formatters, formats, values));
            continue;
        }
        if (isPluralElement(el)) {
            var opt = el.options["=" + value];
            if (!opt) {
                if (!Intl.PluralRules) {
                    throw new FormatError("Intl.PluralRules is not available in this environment.\nTry polyfilling it using \"@formatjs/intl-pluralrules\"\n", "MISSING_INTL_API" /* MISSING_INTL_API */, originalMessage);
                }
                var rule = formatters
                    .getPluralRules(locales, { type: el.pluralType })
                    .select(value - (el.offset || 0));
                opt = el.options[rule] || el.options.other;
            }
            if (!opt) {
                throw new InvalidValueError(el.value, value, Object.keys(el.options), originalMessage);
            }
            result.push.apply(result, formatToParts(opt.value, locales, formatters, formats, values, value - (el.offset || 0)));
            continue;
        }
    }
    return mergeLiteral(result);
}
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