8 files changed, 447 insertions, 0 deletions
diff --git a/node_modules/bcp-47/lib/normal.d.ts b/node_modules/bcp-47/lib/normal.d.ts
new file mode 100644
index 0000000..ca7cd82
--- /dev/null
+++ b/node_modules/bcp-47/lib/normal.d.ts
@@ -0,0 +1,2 @@
+/** @type {Record<string, string|null>} */
+export const normal: Record<string, string | null>
diff --git a/node_modules/bcp-47/lib/normal.js b/node_modules/bcp-47/lib/normal.js
new file mode 100644
index 0000000..20cca11
--- /dev/null
+++ b/node_modules/bcp-47/lib/normal.js
@@ -0,0 +1,29 @@
+/** @type {Record<string, string|null>} */
+export const normal = {
+  'en-gb-oed': 'en-GB-oxendict',
+  'i-ami': 'ami',
+  'i-bnn': 'bnn',
+  'i-default': null,
+  'i-enochian': null,
+  'i-hak': 'hak',
+  'i-klingon': 'tlh',
+  'i-lux': 'lb',
+  'i-mingo': null,
+  'i-navajo': 'nv',
+  'i-pwn': 'pwn',
+  'i-tao': 'tao',
+  'i-tay': 'tay',
+  'i-tsu': 'tsu',
+  'sgn-be-fr': 'sfb',
+  'sgn-be-nl': 'vgt',
+  'sgn-ch-de': 'sgg',
+  'art-lojban': 'jbo',
+  'cel-gaulish': null,
+  'no-bok': 'nb',
+  'no-nyn': 'nn',
+  'zh-guoyu': 'cmn',
+  'zh-hakka': 'hak',
+  'zh-min': null,
+  'zh-min-nan': 'nan',
+  'zh-xiang': 'hsn'
+}
diff --git a/node_modules/bcp-47/lib/parse.d.ts b/node_modules/bcp-47/lib/parse.d.ts
new file mode 100644
index 0000000..ef18cc1
--- /dev/null
+++ b/node_modules/bcp-47/lib/parse.d.ts
@@ -0,0 +1,29 @@
+/**
+ * Parse a BCP 47 language tag.
+ *
+ * @param {string} tag
+ * @param {Options} [options]
+ * @returns {Schema}
+ */
+export function parse(tag: string, options?: Options | undefined): Schema
+export type Warning = (reason: string, code: number, offset: number) => void
+export type Options = {
+  normalize?: boolean | undefined
+  forgiving?: boolean | undefined
+  warning?: Warning | undefined
+}
+export type Extension = {
+  singleton: string
+  extensions: Array<string>
+}
+export type Schema = {
+  language: string | null | undefined
+  extendedLanguageSubtags: Array<string>
+  script: string | null | undefined
+  region: string | null | undefined
+  variants: Array<string>
+  extensions: Array<Extension>
+  privateuse: Array<string>
+  irregular: string | null | undefined
+  regular: string | null | undefined
+}
diff --git a/node_modules/bcp-47/lib/parse.js b/node_modules/bcp-47/lib/parse.js
new file mode 100644
index 0000000..7251a71
--- /dev/null
+++ b/node_modules/bcp-47/lib/parse.js
@@ -0,0 +1,310 @@
+/**
+ * @callback Warning
+ * @param {string} reason
+ * @param {number} code
+ * @param {number} offset
+ * @returns {void}
+ *
+ * @typedef Options
+ * @property {boolean} [normalize=true]
+ * @property {boolean} [forgiving=false]
+ * @property {Warning} [warning]
+ *
+ * @typedef Extension
+ * @property {string} singleton
+ * @property {Array<string>} extensions
+ *
+ * @typedef Schema
+ * @property {string|null|undefined} language
+ * @property {Array<string>} extendedLanguageSubtags
+ * @property {string|null|undefined} script
+ * @property {string|null|undefined} region
+ * @property {Array<string>} variants
+ * @property {Array<Extension>} extensions
+ * @property {Array<string>} privateuse
+ * @property {string|null|undefined} irregular
+ * @property {string|null|undefined} regular
+ */
+
+import {isAlphanumerical} from 'is-alphanumerical'
+import {isAlphabetical} from 'is-alphabetical'
+import {isDecimal} from 'is-decimal'
+import {regular} from './regular.js'
+import {normal} from './normal.js'
+
+const own = {}.hasOwnProperty
+
+/**
+ * Parse a BCP 47 language tag.
+ *
+ * @param {string} tag
+ * @param {Options} [options]
+ * @returns {Schema}
+ */
+export function parse(tag, options = {}) {
+  const result = empty()
+  const source = String(tag)
+  const value = source.toLowerCase()
+  let index = 0
+
+  // Check input.
+  if (tag === null || tag === undefined) {
+    throw new Error('Expected string, got `' + tag + '`')
+  }
+
+  // Let’s start.
+  // First: the edge cases.
+  if (own.call(normal, value)) {
+    const replacement = normal[value]
+
+    if (
+      (options.normalize === undefined ||
+        options.normalize === null ||
+        options.normalize) &&
+      typeof replacement === 'string'
+    ) {
+      return parse(replacement)
+    }
+
+    result[regular.includes(value) ? 'regular' : 'irregular'] = source
+
+    return result
+  }
+
+  // Now, to actually parse, eat what could be a language.
+  while (isAlphabetical(value.charCodeAt(index)) && index < 9) index++
+
+  // A language.
+  if (index > 1 /* Min 639. */ && index < 9 /* Max subtag. */) {
+    // 5 and up is a subtag.
+    // 4 is the size of reserved languages.
+    // 3 an ISO 639-2 or ISO 639-3.
+    // 2 is an ISO 639-1.
+    // <https://github.com/wooorm/iso-639-2>
+    // <https://github.com/wooorm/iso-639-3>
+    result.language = source.slice(0, index)
+
+    if (index < 4 /* Max 639. */) {
+      let groups = 0
+
+      while (
+        value.charCodeAt(index) === 45 /* `-` */ &&
+        isAlphabetical(value.charCodeAt(index + 1)) &&
+        isAlphabetical(value.charCodeAt(index + 2)) &&
+        isAlphabetical(value.charCodeAt(index + 3)) &&
+        !isAlphabetical(value.charCodeAt(index + 4))
+      ) {
+        if (groups > 2 /* Max extended language subtag count. */) {
+          return fail(
+            index,
+            3,
+            'Too many extended language subtags, expected at most 3 subtags'
+          )
+        }
+
+        // Extended language subtag.
+        result.extendedLanguageSubtags.push(source.slice(index + 1, index + 4))
+        index += 4
+        groups++
+      }
+    }
+
+    // ISO 15924 script.
+    // <https://github.com/wooorm/iso-15924>
+    if (
+      value.charCodeAt(index) === 45 /* `-` */ &&
+      isAlphabetical(value.charCodeAt(index + 1)) &&
+      isAlphabetical(value.charCodeAt(index + 2)) &&
+      isAlphabetical(value.charCodeAt(index + 3)) &&
+      isAlphabetical(value.charCodeAt(index + 4)) &&
+      !isAlphabetical(value.charCodeAt(index + 5))
+    ) {
+      result.script = source.slice(index + 1, index + 5)
+      index += 5
+    }
+
+    if (value.charCodeAt(index) === 45 /* `-` */) {
+      // ISO 3166-1 region.
+      // <https://github.com/wooorm/iso-3166>
+      if (
+        isAlphabetical(value.charCodeAt(index + 1)) &&
+        isAlphabetical(value.charCodeAt(index + 2)) &&
+        !isAlphabetical(value.charCodeAt(index + 3))
+      ) {
+        result.region = source.slice(index + 1, index + 3)
+        index += 3
+      }
+      // UN M49 region.
+      // <https://github.com/wooorm/un-m49>
+      else if (
+        isDecimal(value.charCodeAt(index + 1)) &&
+        isDecimal(value.charCodeAt(index + 2)) &&
+        isDecimal(value.charCodeAt(index + 3)) &&
+        !isDecimal(value.charCodeAt(index + 4))
+      ) {
+        result.region = source.slice(index + 1, index + 4)
+        index += 4
+      }
+    }
+
+    while (value.charCodeAt(index) === 45 /* `-` */) {
+      const start = index + 1
+      let offset = start
+
+      while (isAlphanumerical(value.charCodeAt(offset))) {
+        if (offset - start > 7 /* Max variant. */) {
+          return fail(
+            offset,
+            1,
+            'Too long variant, expected at most 8 characters'
+          )
+        }
+
+        offset++
+      }
+
+      if (
+        // Long variant.
+        offset - start > 4 /* Min alpha numeric variant. */ ||
+        // Short variant.
+        (offset - start > 3 /* Min variant. */ &&
+          isDecimal(value.charCodeAt(start)))
+      ) {
+        result.variants.push(source.slice(start, offset))
+        index = offset
+      }
+      // Something else.
+      else {
+        break
+      }
+    }
+
+    // Extensions.
+    while (value.charCodeAt(index) === 45 /* `-` */) {
+      // Exit if this isn’t an extension.
+      if (
+        value.charCodeAt(index + 1) === 120 /* `x` */ ||
+        !isAlphanumerical(value.charCodeAt(index + 1)) ||
+        value.charCodeAt(index + 2) !== 45 /* `-` */ ||
+        !isAlphanumerical(value.charCodeAt(index + 3))
+      ) {
+        break
+      }
+
+      let offset = index + 2
+      let groups = 0
+
+      while (
+        value.charCodeAt(offset) === 45 /* `-` */ &&
+        isAlphanumerical(value.charCodeAt(offset + 1)) &&
+        isAlphanumerical(value.charCodeAt(offset + 2))
+      ) {
+        const start = offset + 1
+        offset = start + 2
+        groups++
+
+        while (isAlphanumerical(value.charCodeAt(offset))) {
+          if (offset - start > 7 /* Max extension. */) {
+            return fail(
+              offset,
+              2,
+              'Too long extension, expected at most 8 characters'
+            )
+          }
+
+          offset++
+        }
+      }
+
+      if (!groups) {
+        return fail(
+          offset,
+          4,
+          'Empty extension, extensions must have at least 2 characters of content'
+        )
+      }
+
+      result.extensions.push({
+        singleton: source.charAt(index + 1),
+        extensions: source.slice(index + 3, offset).split('-')
+      })
+
+      index = offset
+    }
+  }
+  // Not a language.
+  else {
+    index = 0
+  }
+
+  // Private use.
+  if (
+    (index === 0 && value.charCodeAt(index) === 120) /* `x` */ ||
+    (value.charCodeAt(index) === 45 /* `-` */ &&
+      value.charCodeAt(index + 1) === 120) /* `x` */
+  ) {
+    index = index ? index + 2 : 1
+    let offset = index
+
+    while (
+      value.charCodeAt(offset) === 45 /* `-` */ &&
+      isAlphanumerical(value.charCodeAt(offset + 1))
+    ) {
+      const start = index + 1
+      offset = start
+
+      while (isAlphanumerical(value.charCodeAt(offset))) {
+        if (offset - start > 7 /* Max private use. */) {
+          return fail(
+            offset,
+            5,
+            'Too long private-use area, expected at most 8 characters'
+          )
+        }
+
+        offset++
+      }
+
+      result.privateuse.push(source.slice(index + 1, offset))
+      index = offset
+    }
+  }
+
+  if (index !== source.length) {
+    return fail(index, 6, 'Found superfluous content after tag')
+  }
+
+  return result
+
+  /**
+   * Create an empty results object.
+   *
+   * @param {number} offset
+   * @param {number} code
+   * @param {string} reason
+   * @returns {Schema}
+   */
+  function fail(offset, code, reason) {
+    if (options.warning) options.warning(reason, code, offset)
+    return options.forgiving ? result : empty()
+  }
+}
+
+/**
+ * Create an empty results object.
+ *
+ * @returns {Schema}
+ */
+function empty() {
+  return {
+    language: null,
+    extendedLanguageSubtags: [],
+    script: null,
+    region: null,
+    variants: [],
+    extensions: [],
+    privateuse: [],
+    irregular: null,
+    regular: null
+  }
+}
diff --git a/node_modules/bcp-47/lib/regular.d.ts b/node_modules/bcp-47/lib/regular.d.ts
new file mode 100644
index 0000000..1818fbd
--- /dev/null
+++ b/node_modules/bcp-47/lib/regular.d.ts
@@ -0,0 +1,2 @@
+/** @type {Array<string>} */
+export const regular: Array<string>
diff --git a/node_modules/bcp-47/lib/regular.js b/node_modules/bcp-47/lib/regular.js
new file mode 100644
index 0000000..0aa5fab
--- /dev/null
+++ b/node_modules/bcp-47/lib/regular.js
@@ -0,0 +1,12 @@
+/** @type {Array<string>} */
+export const regular = [
+  'art-lojban',
+  'cel-gaulish',
+  'no-bok',
+  'no-nyn',
+  'zh-guoyu',
+  'zh-hakka',
+  'zh-min',
+  'zh-min-nan',
+  'zh-xiang'
+]
diff --git a/node_modules/bcp-47/lib/stringify.d.ts b/node_modules/bcp-47/lib/stringify.d.ts
new file mode 100644
index 0000000..14942c4
--- /dev/null
+++ b/node_modules/bcp-47/lib/stringify.d.ts
@@ -0,0 +1,13 @@
+/**
+ * @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?: Schema): string
+export type Schema = Partial<import('./parse.js').Schema>
+export type Extension = Partial<import('./parse.js').Extension>
diff --git a/node_modules/bcp-47/lib/stringify.js b/node_modules/bcp-47/lib/stringify.js
new file mode 100644
index 0000000..e5b367a
--- /dev/null
+++ b/node_modules/bcp-47/lib/stringify.js
@@ -0,0 +1,50 @@
+/**
+ * @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('-')
+}