Initial commit

node_modules/luxon/src/zones/fixedOffsetZone.js

@@ -0,0 +1,150 @@
+import { formatOffset, signedOffset } from "../impl/util.js";
+import Zone from "../zone.js";
+
+let singleton = null;
+
+/**
+ * A zone with a fixed offset (meaning no DST)
+ * @implements {Zone}
+ */
+export default class FixedOffsetZone extends Zone {
+  /**
+   * Get a singleton instance of UTC
+   * @return {FixedOffsetZone}
+   */
+  static get utcInstance() {
+    if (singleton === null) {
+      singleton = new FixedOffsetZone(0);
+    }
+    return singleton;
+  }
+
+  /**
+   * Get an instance with a specified offset
+   * @param {number} offset - The offset in minutes
+   * @return {FixedOffsetZone}
+   */
+  static instance(offset) {
+    return offset === 0 ? FixedOffsetZone.utcInstance : new FixedOffsetZone(offset);
+  }
+
+  /**
+   * Get an instance of FixedOffsetZone from a UTC offset string, like "UTC+6"
+   * @param {string} s - The offset string to parse
+   * @example FixedOffsetZone.parseSpecifier("UTC+6")
+   * @example FixedOffsetZone.parseSpecifier("UTC+06")
+   * @example FixedOffsetZone.parseSpecifier("UTC-6:00")
+   * @return {FixedOffsetZone}
+   */
+  static parseSpecifier(s) {
+    if (s) {
+      const r = s.match(/^utc(?:([+-]\d{1,2})(?::(\d{2}))?)?$/i);
+      if (r) {
+        return new FixedOffsetZone(signedOffset(r[1], r[2]));
+      }
+    }
+    return null;
+  }
+
+  constructor(offset) {
+    super();
+    /** @private **/
+    this.fixed = offset;
+  }
+
+  /**
+   * The type of zone. `fixed` for all instances of `FixedOffsetZone`.
+   * @override
+   * @type {string}
+   */
+  get type() {
+    return "fixed";
+  }
+
+  /**
+   * The name of this zone.
+   * All fixed zones' names always start with "UTC" (plus optional offset)
+   * @override
+   * @type {string}
+   */
+  get name() {
+    return this.fixed === 0 ? "UTC" : `UTC${formatOffset(this.fixed, "narrow")}`;
+  }
+
+  /**
+   * The IANA name of this zone, i.e. `Etc/UTC` or `Etc/GMT+/-nn`
+   *
+   * @override
+   * @type {string}
+   */
+  get ianaName() {
+    if (this.fixed === 0) {
+      return "Etc/UTC";
+    } else {
+      return `Etc/GMT${formatOffset(-this.fixed, "narrow")}`;
+    }
+  }
+
+  /**
+   * Returns the offset's common name at the specified timestamp.
+   *
+   * For fixed offset zones this equals to the zone name.
+   * @override
+   */
+  offsetName() {
+    return this.name;
+  }
+
+  /**
+   * Returns the offset's value as a string
+   * @override
+   * @param {number} ts - Epoch milliseconds for which to get the offset
+   * @param {string} format - What style of offset to return.
+   *                          Accepts 'narrow', 'short', or 'techie'. Returning '+6', '+06:00', or '+0600' respectively
+   * @return {string}
+   */
+  formatOffset(ts, format) {
+    return formatOffset(this.fixed, format);
+  }
+
+  /**
+   * Returns whether the offset is known to be fixed for the whole year:
+   * Always returns true for all fixed offset zones.
+   * @override
+   * @type {boolean}
+   */
+  get isUniversal() {
+    return true;
+  }
+
+  /**
+   * Return the offset in minutes for this zone at the specified timestamp.
+   *
+   * For fixed offset zones, this is constant and does not depend on a timestamp.
+   * @override
+   * @return {number}
+   */
+  offset() {
+    return this.fixed;
+  }
+
+  /**
+   * Return whether this Zone is equal to another zone (i.e. also fixed and same offset)
+   * @override
+   * @param {Zone} otherZone - the zone to compare
+   * @return {boolean}
+   */
+  equals(otherZone) {
+    return otherZone.type === "fixed" && otherZone.fixed === this.fixed;
+  }
+
+  /**
+   * Return whether this Zone is valid:
+   * All fixed offset zones are valid.
+   * @override
+   * @type {boolean}
+   */
+  get isValid() {
+    return true;
+  }
+}