[LG-5504] feat(input-box): add input-box package with utility functions for date/time input handling

packages/input-box/README.md

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+# Internal Input Box
+
+An internal component intended to be used by any date or time component.
+I.e. `DatePicker`, `TimeInput` etc.

packages/input-box/package.json

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+
+{
+  "name": "@leafygreen-ui/input-box",
+  "version": "0.0.1",
+  "description": "LeafyGreen UI Kit Input Box",
+  "main": "./dist/umd/index.js",
+  "module": "./dist/esm/index.js",
+  "types": "./dist/types/index.d.ts",
+  "license": "Apache-2.0",
+  "exports": {
+    ".": {
+      "require": "./dist/umd/index.js",
+      "import": "./dist/esm/index.js",
+      "types": "./dist/types/index.d.ts"
+    },
+    "./testing": {
+      "require": "./dist/umd/testing/index.js",
+      "import": "./dist/esm/testing/index.js",
+      "types": "./dist/types/testing/index.d.ts"
+    }
+  },
+  "scripts": {
+    "build": "lg-build bundle",
+    "tsc": "lg-build tsc",
+    "docs": "lg-build docs"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "dependencies": {
+    "@leafygreen-ui/emotion": "workspace:^",
+    "@leafygreen-ui/lib": "workspace:^",
+    "@leafygreen-ui/hooks": "workspace:^",
+    "@leafygreen-ui/date-utils": "workspace:^",
+    "@leafygreen-ui/palette": "workspace:^",
+    "@leafygreen-ui/tokens": "workspace:^",
+    "@leafygreen-ui/typography": "workspace:^"
+  },
+  "peerDependencies": {
+    "@leafygreen-ui/leafygreen-provider": "workspace:^"
+  },
+  "homepage": "https://github.com/mongodb/leafygreen-ui/tree/main/packages/input-box",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/mongodb/leafygreen-ui"
+  },
+  "bugs": {
+    "url": "https://jira.mongodb.org/projects/LG/summary"
+  }
+}

packages/input-box/src/index.ts

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+export {
+  createExplicitSegmentValidator,
+  type ExplicitSegmentRule,
+  isElementInputSegment,
+  isValidValueForSegment,
+} from './utils';
+export { getValueFormatter } from './utils/getValueFormatter/getValueFormatter';
+export {
+  isValidSegmentName,
+  isValidSegmentValue,
+} from './utils/isValidSegment/isValidSegment';

packages/input-box/src/utils/createExplicitSegmentValidator/createExplicitSegmentValidator.spec.ts

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+import { createExplicitSegmentValidator } from './createExplicitSegmentValidator';
+
+const segmentObj = {
+  Day: 'day',
+  Month: 'month',
+  Year: 'year',
+  Hour: 'hour',
+  Minute: 'minute',
+} as const;
+
+const rules = {
+  day: { maxChars: 2, minExplicitValue: 4 },
+  month: { maxChars: 2, minExplicitValue: 2 },
+  year: { maxChars: 4 }, // any 4-digit year
+  hour: { maxChars: 2, minExplicitValue: 3 },
+  minute: { maxChars: 2, minExplicitValue: 6 },
+};
+
+const isExplicitSegmentValue = createExplicitSegmentValidator({
+  segmentEnum: segmentObj,
+  rules,
+});
+
+describe('packages/input-box/utils/createExplicitSegmentValidator', () => {
+  describe('day segment', () => {
+    test('returns false for single digit below minExplicitValue', () => {
+      expect(isExplicitSegmentValue('day', '1')).toBe(false);
+      expect(isExplicitSegmentValue('day', '2')).toBe(false);
+      expect(isExplicitSegmentValue('day', '3')).toBe(false);
+    });
+
+    test('returns true for single digit at or above minExplicitValue', () => {
+      expect(isExplicitSegmentValue('day', '4')).toBe(true);
+      expect(isExplicitSegmentValue('day', '5')).toBe(true);
+      expect(isExplicitSegmentValue('day', '9')).toBe(true);
+    });
+
+    test('returns true for two-digit values (maxChars)', () => {
+      expect(isExplicitSegmentValue('day', '01')).toBe(true);
+      expect(isExplicitSegmentValue('day', '10')).toBe(true);
+      expect(isExplicitSegmentValue('day', '22')).toBe(true);
+      expect(isExplicitSegmentValue('day', '31')).toBe(true);
+    });
+
+    test('returns false for invalid values', () => {
+      expect(isExplicitSegmentValue('day', '0')).toBe(false);
+      expect(isExplicitSegmentValue('day', '')).toBe(false);
+    });
+  });
+
+  describe('month segment', () => {
+    test('returns false for single digit below minExplicitValue', () => {
+      expect(isExplicitSegmentValue('month', '1')).toBe(false);
+    });
+
+    test('returns true for single digit at or above minExplicitValue', () => {
+      expect(isExplicitSegmentValue('month', '2')).toBe(true);
+      expect(isExplicitSegmentValue('month', '3')).toBe(true);
+      expect(isExplicitSegmentValue('month', '9')).toBe(true);
+    });
+
+    test('returns true for two-digit values (maxChars)', () => {
+      expect(isExplicitSegmentValue('month', '01')).toBe(true);
+      expect(isExplicitSegmentValue('month', '12')).toBe(true);
+    });
+
+    test('returns false for invalid values', () => {
+      expect(isExplicitSegmentValue('month', '0')).toBe(false);
+      expect(isExplicitSegmentValue('month', '')).toBe(false);
+    });
+  });
+
+  describe('year segment', () => {
+    test('returns false for values shorter than maxChars', () => {
+      expect(isExplicitSegmentValue('year', '1')).toBe(false);
+      expect(isExplicitSegmentValue('year', '20')).toBe(false);
+      expect(isExplicitSegmentValue('year', '200')).toBe(false);
+    });
+
+    test('returns true for four-digit values (maxChars)', () => {
+      expect(isExplicitSegmentValue('year', '1970')).toBe(true);
+      expect(isExplicitSegmentValue('year', '2000')).toBe(true);
+      expect(isExplicitSegmentValue('year', '2023')).toBe(true);
+      expect(isExplicitSegmentValue('year', '0001')).toBe(true);
+    });
+
+    test('returns false for invalid values', () => {
+      expect(isExplicitSegmentValue('year', '0')).toBe(false);
+      expect(isExplicitSegmentValue('year', '')).toBe(false);
+    });
+  });
+
+  describe('hour segment', () => {
+    test('returns false for single digit below minExplicitValue', () => {
+      expect(isExplicitSegmentValue('hour', '1')).toBe(false);
+      expect(isExplicitSegmentValue('hour', '0')).toBe(false);
+      expect(isExplicitSegmentValue('hour', '2')).toBe(false);
+    });
+
+    test('returns true for single digit at or above minExplicitValue', () => {
+      expect(isExplicitSegmentValue('hour', '3')).toBe(true);
+      expect(isExplicitSegmentValue('hour', '9')).toBe(true);
+    });
+
+    test('returns true for two-digit values at or above minExplicitValue', () => {
+      expect(isExplicitSegmentValue('hour', '12')).toBe(true);
+      expect(isExplicitSegmentValue('hour', '23')).toBe(true);
+      expect(isExplicitSegmentValue('hour', '05')).toBe(true);
+    });
+  });
+
+  describe('minute segment', () => {
+    test('returns false for single digit below minExplicitValue', () => {
+      expect(isExplicitSegmentValue('minute', '0')).toBe(false);
+      expect(isExplicitSegmentValue('minute', '1')).toBe(false);
+      expect(isExplicitSegmentValue('minute', '5')).toBe(false);
+    });
+
+    test('returns true for single digit at or above minExplicitValue', () => {
+      expect(isExplicitSegmentValue('minute', '6')).toBe(true);
+      expect(isExplicitSegmentValue('minute', '7')).toBe(true);
+      expect(isExplicitSegmentValue('minute', '9')).toBe(true);
+    });
+
+    test('returns true for two-digit values at or above minExplicitValue', () => {
+      expect(isExplicitSegmentValue('minute', '59')).toBe(true);
+    });
+  });
+
+  describe('invalid segment names', () => {
+    test('returns false for unknown segment names', () => {
+      // @ts-expect-error Testing invalid segment
+      expect(isExplicitSegmentValue('invalid', '10')).toBe(false);
+      // @ts-expect-error Testing invalid segment
+      expect(isExplicitSegmentValue('millisecond', '12')).toBe(false);
+    });
+  });
+});

packages/input-box/src/utils/createExplicitSegmentValidator/createExplicitSegmentValidator.ts

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+import {
+  isValidSegmentName,
+  isValidSegmentValue,
+} from '../isValidSegment/isValidSegment';
+
+/**
+ * Configuration for determining if a segment value is an explicit, unique value for a given segment.
+ */
+export interface ExplicitSegmentRule {
+  /** Maximum characters for this segment */
+  maxChars: number;
+  /** Minimum numeric value that makes the input explicit (optional) */
+  minExplicitValue?: number;
+}
+
+/**
+ * Factory function that creates a segment value validator that checks if a segment value is an explicit, unique value for a given segment.
+ *
+ * An "explicit" segment value is one that is complete and unambiguous, eliminating the possibility that it is a partial input.
+ * A value is considered explicit if it meets one of two conditions:
+ * 1.  **Maximum Length:** The value has been padded (e.g., with leading zeros) to reach the segment's maximum character length (`maxChars`).
+ * *(Example: For `maxChars: 2`, '01' is explicit, but '1' is not).*
+ * 2.  **Minimum Value Threshold:** The value, while shorter than `maxChars`, is numerically equal to or greater than the segment's defined `minExplicitValue`. This ensures single-digit inputs are treated as final values rather than the start of a multi-digit entry.
+ * *(Example: For `minExplicitValue: 4`, '4' is explicit, but '1' is potentially ambiguous).*
+ *
+ * @param segmentEnum - The segment enum/object containing the segment names and their corresponding values to validate against
+ * @param rules - Rules for each segment type
+ * @returns A function that checks if a segment value is explicit
+ *
+ * @example
+ * const segmentObj = {
+ *   Day: 'day',
+ *   Month: 'month',
+ *   Year: 'year',
+ *   Hour: 'hour',
+ *   Minute: 'minute',
+ * };
+ * const rules = {
+ *   day: { maxChars: 2, minExplicitValue: 4 },
+ *   month: { maxChars: 2, minExplicitValue: 2 },
+ *   year: { maxChars: 4 },
+ *   hour: { maxChars: 2, minExplicitValue: 3 },
+ *   minute: { maxChars: 2, minExplicitValue: 6 },
+ * };
+ *
+ * // Contrast this with an ambiguous segment value:
+ * // Explicit: Day = '4' (meets min value), '02' (meets max length)
+ * // Ambiguous: Day = '2' (does not meet max length and is less than min value)
+ *
+ * const isExplicitSegmentValue = createExplicitSegmentValidator({
+ *   segmentEnum,
+ *   rules,
+ * });
+ *
+ * isExplicitSegmentValue('day', '1'); // false (Ambiguous - below min value and max length)
+ * isExplicitSegmentValue('day', '01'); // true (Explicit - meets max length)
+ * isExplicitSegmentValue('day', '4'); // true (Explicit - meets min value)
+ * isExplicitSegmentValue('year', '2000'); // true (Explicit - meets max length)
+ * isExplicitSegmentValue('year', '1'); // false (Ambiguous - below max length)
+ * isExplicitSegmentValue('hour', '05'); // true (Explicit - meets min value)
+ * isExplicitSegmentValue('hour', '23'); // true (Explicit - meets max length)
+ * isExplicitSegmentValue('hour', '2'); // false (Ambiguous - below min value)
+ * isExplicitSegmentValue('minute', '07'); // true (Explicit - meets min value)
+ * isExplicitSegmentValue('minute', '59'); // true (Explicit - meets max length)
+ * isExplicitSegmentValue('minute', '5'); // false (Ambiguous - below min value)
+ */
+export function createExplicitSegmentValidator<
+  SegmentEnum extends Record<string, string>,
+>({
+  segmentEnum,
+  rules,
+}: {
+  segmentEnum: SegmentEnum;
+  rules: Record<SegmentEnum[keyof SegmentEnum], ExplicitSegmentRule>;
+}) {
+  return (segment: SegmentEnum[keyof SegmentEnum], value: string): boolean => {
+    if (
+      !(isValidSegmentValue(value) && isValidSegmentName(segmentEnum, segment))
+    )
+      return false;
+
+    const rule = rules[segment];
+    if (!rule) return false;
+
+    const isMaxLength = value.length === rule.maxChars;
+    const meetsMinValue = rule.minExplicitValue
+      ? Number(value) >= rule.minExplicitValue
+      : false;
+
+    return isMaxLength || meetsMinValue;
+  };
+}