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/**
* @typedef {Partial<import('./parse.js').Schema>} Schema
* @typedef {Partial<import('./parse.js').Extension>} Extension
*/
/**
* Compile a language schema to a BCP 47 language tag.
*
* @param {Schema} schema
* @returns {string}
*/
export function stringify(schema = {}) {
/** @type {Array<string>} */
let result = []
if (schema.irregular) {
return schema.irregular
}
if (schema.regular) {
return schema.regular
}
if (schema.language) {
result = result.concat(
schema.language,
schema.extendedLanguageSubtags || [],
schema.script || [],
schema.region || [],
schema.variants || []
)
const values = schema.extensions || []
let index = -1
while (++index < values.length) {
const value = values[index]
if (value.singleton && value.extensions && value.extensions.length > 0) {
result.push(value.singleton, ...value.extensions)
}
}
}
if (schema.privateuse && schema.privateuse.length > 0) {
result.push('x', ...schema.privateuse)
}
return result.join('-')
}
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