bharat_fx 1.0.2

The ultimate Indian localization and input toolkit for Flutter, featuring currency formatters, PIN code lookup, vernacular keyboards, and ID validators.

Bharat FX 🇮🇳

The Ultimate Indian Localization & Input Toolkit for Flutter

bharat_fx is a lightweight, 100% dependency-free Flutter package tailored specifically for the Indian market. Global packages often overlook the unique cultural, financial, and linguistic nuances of India. bharat_fx solves these India-specific pain points out of the box with zero external dependencies and zero API fees.

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🌟 Key Highlights

• 💰 Indian Currency Formatter (BharatCurrency): Formats numbers into the Indian numbering system (Lakh / Crore: ₹1,50,000 instead of 150,000), compact scales (1.5 L, 2.5 Cr), and converts numbers to words in 8 Indian languages (English, Hindi, Tamil, Telugu, Kannada, Marathi, Gujarati, Bengali).
• 📍 Smart Indian Address & PIN Code Validator (BharatInput): 6-digit Indian PIN code validator with a bundled offline local algorithm that instantly resolves District, State, Postal Circle, and Zone in sub-millisecond time without network calls.
• ✍️ Vernacular Keyboard & Phonetic Filters (BharatText): Input formatters that restrict inputs to native Indian scripts (Devanagari, Tamil, Telugu, etc.) or convert Hinglish/Phonetic text to Indian scripts in real-time (e.g. typing "namaste" becomes "नमस्ते").
• 🚗 Vehicle Number Plate Validator & HSRP Widget (BharatVehicle): Comprehensive regex validator for State formats (DL 01 AB 1234), the new Bharat (BH) series, Military, and Diplomatic plates. Includes an authentic High-Security Registration Plate (HSRP) visual widget.
• 🆔 Government IDs & UPI Masker / Validator (BharatId):
  • Aadhaar Card: 12 digits with the official UIDAI Verhoeff algorithm checksum and UIDAI-compliant masking (XXXX XXXX 1234).
  • PAN Card: 10-character structure with 4th character entity status decoding (P for Individual, C for Company, T for Trust, etc.).
  • UPI ID: Validates VPA format and automatically identifies the PSP and Bank (@okaxis -> Google Pay / Axis Bank, @ybl -> PhonePe / YES Bank, etc.).
  • GSTIN, IFSC & Mobile Number: 15-char GSTIN with PAN extraction, 11-char IFSC bank identifier, and 10-digit Indian mobile number formatters.
• ⚡ 100% Dependency-Free: Pure Flutter and Dart. Zero external package conflicts.

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📦 Installation

Add bharat_fx to your pubspec.yaml:

dependencies:
  bharat_fx: ^1.0.0

Import the package:

import 'package:bharat_fx/bharat_fx.dart';

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🚀 Module Walkthrough

1. Indian Currency Formatter (BharatCurrency)

Global formatters use millions and billions, but India operates on Lakhs and Crores.

// Format with Indian comma grouping (2,2,3 grouping)
BharatCurrency.format(150000); // "₹1,50,000"
BharatCurrency.format(1234567.50); // "₹12,34,567.50"
BharatCurrency.format(10000000, showSymbol: false); // "1,00,00,000"

// Compact Indian notation
BharatCurrency.compact(150000); // "₹1.5 L"
BharatCurrency.compact(150000, shortUnit: false); // "₹1.5 Lakh"
BharatCurrency.compact(25000000); // "₹2.5 Cr"
BharatCurrency.compact(1200000000); // "₹1.2 Arab"

// Convert numbers into words across 8 Indian languages
BharatCurrency.toWords(15000);
// "Fifteen Thousand Rupees Only"

BharatCurrency.toWords(15000, language: BharatLanguage.hindi);
// "पंद्रह हज़ार रुपये मात्र"

BharatCurrency.toWords(100000, language: BharatLanguage.tamil);
// "ஒரு லட்சம் ரூபாய் மட்டும்"

BharatCurrency.toWords(100000, language: BharatLanguage.telugu);
// "ఒక లక్ష రూపాయలు మాత్రమే"

// Live typing TextInputFormatter for TextFields
TextField(
  keyboardType: TextInputType.number,
  inputFormatters: [BharatCurrencyInputFormatter()],
)

// Display Widget
BharatCurrencyText(
  150000,
  showWordsSubtitle: true, // Displays "One Lakh Fifty Thousand Rupees Only" below
)

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2. Smart Indian Address & PIN Code Validator (BharatInput)

Validate 6-digit Indian PIN codes and resolve geographical details 100% offline with zero network latency:

// Validation
BharatPinCode.isValid('560001'); // true
BharatPinCode.isValid('010001'); // false (Indian PINs never start with 0)

// Instant offline local lookup
final info = BharatPinCode.lookup('560001');
print(info.state);    // "Karnataka"
print(info.district); // "Bengaluru Urban"
print(info.zone);     // "Southern Postal Zone"
print(info.circle);   // "Karnataka"

Real-Time Auto-Filling Form Field:

Drop in BharatPinCodeFormField to auto-fill the user's State and District controllers as soon as 6 digits are typed:

final stateController = TextEditingController();
final districtController = TextEditingController();

BharatPinCodeFormField(
  stateController: stateController,
  districtController: districtController,
  showResolvedInfoInline: true,
  onResolved: (PinCodeInfo info) {
    print("Resolved: ${info.district}, ${info.state}");
  },
)

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3. Vernacular Keyboard & Phonetic Filters (BharatText)

Provide natural typing for regional Indian users:

// Real-time Phonetic / Hinglish transliteration
BharatTransliterator.transliterate("namaste"); // "नमस्ते"
BharatTransliterator.transliterate("bharat mahan hai"); // "भारत महान है"
BharatTransliterator.transliterate("vanakkam", targetScript: IndianScript.tamil); // "வணக்கம்"

// Live phonetic keyboard formatter in TextField (converts on space)
TextField(
  inputFormatters: [
    BharatPhoneticInputFormatter(
      targetScript: IndianScript.devanagari,
      convertOnSpace: true,
    ),
  ],
)

// Restrict input exclusively to an Indian script
TextField(
  inputFormatters: [
    BharatScriptInputFormatter.single(IndianScript.devanagari),
  ],
)

// Convert numbers between Arabic and Indic numerals
BharatText.toIndicDigits("12345", IndianScript.devanagari); // "१२३४५"
BharatText.fromIndicDigits("१२३४५"); // "12345"

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4. Vehicle Registration Plate Validator (BharatVehicle)

Validate Indian vehicle registration numbers and display authentic High-Security Registration Plates (HSRP):

// Validate and parse standard state format
final plate = BharatVehicle.validate("DL 01 AB 1234");
print(plate.isValid);    // true
print(plate.stateName);  // "Delhi"
print(plate.rtoName);    // "Mall Road, North Delhi"
print(plate.rtoCode);    // "01"
print(plate.series);     // "AB"
print(plate.registrationNumber); // "1234"

// Validate the new pan-India Bharat (BH) series
final bh = BharatVehicle.validate("21 BH 1234 AA");
print(bh.isValid);          // true
print(bh.type);             // VehiclePlateType.bharatSeries
print(bh.registrationYear); // 2021

// Also supports Military (↑ 21 D 123456 X) and Diplomatic (77 CD 1234) plates

Realistic HSRP License Plate Widget:

BharatVehiclePlateWidget(
  plateNumber: 'KA 01 AB 1234',
  category: VehiclePlateCategory.privateVehicle, // White plate
  // Or: commercialVehicle (Yellow), electricVehicle (Green), rentalVehicle (Black)
  height: 56,
)

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5. Indian Government IDs & Payment Validators (BharatId)

Aadhaar Card (12 Digits with UIDAI Verhoeff Checksum):

// Validates 12 digits, checks non-0/1 start, and runs the Verhoeff checksum algorithm
BharatId.isAadhaar("234567890124"); // true / false

// Masking per UIDAI privacy standards
BharatId.maskAadhaar("234567890124"); // "XXXX XXXX 0124"
BharatId.maskAadhaar("234567890124", maskChar: '•'); // "•••• •••• 0124"

PAN Card (10 Characters with 4th Char Entity Classifier):

final pan = BharatId.validatePan("ABCPD1234F");
print(pan.isValid);             // true
print(pan.category);            // PanCategory.individual
print(pan.categoryDescription); // "Individual (Person)"

// Validate entity category constraints
final companyPan = BharatId.validatePan(
  "AAACR1234G",
  expectedCategory: PanCategory.individual,
);
print(companyPan.isValid); // false (PAN belongs to Company)

// Masking
BharatId.maskPan("ABCPD1234F"); // "XXXXX1234F"

UPI ID / VPA with PSP & Bank Detection:

final upi = BharatId.validateUpi("user@okaxis");
print(upi.isValid);  // true
print(upi.pspName);  // "Google Pay"
print(upi.bankName); // "Axis Bank"

final phonePe = BharatId.validateUpi("9876543210@ybl");
print(phonePe.pspName); // "PhonePe"
print(phonePe.bankName); // "YES Bank"

GSTIN, IFSC & Mobile Phone:

// GSTIN
final gstin = BharatId.validateGstin("27AAPFU0939F1ZV");
print(gstin.stateCode); // "27" (Maharashtra)
print(gstin.pan);       // "AAPFU0939F"

// IFSC
final ifsc = BharatId.validateIfsc("SBIN0000123");
print(ifsc.bankName); // "State Bank of India"

// Indian Mobile (+91)
final phone = BharatId.validatePhone("9876543210");
print(phone.formattedNumber); // "[phone]"

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6. Specialized UI Widget: BharatTextField

An all-in-one pre-configured TextFormField with pre-wired formatters, regex, keyboards, and live validation indicators:

// Aadhaar field with 4-digit space grouping and Verhoeff validation
BharatTextField(
  type: BharatTextFieldType.aadhaar,
)

// PAN field with auto-capitalization and category decoding
BharatTextField(
  type: BharatTextFieldType.pan,
)

// UPI field with live PSP badge
BharatTextField(
  type: BharatTextFieldType.upi,
)

// Currency field with Rupee prefix and live Indian comma formatting
BharatTextField(
  type: BharatTextFieldType.currency,
)

// Vehicle plate field with auto-capitalization
BharatTextField(
  type: BharatTextFieldType.vehiclePlate,
)

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📱 Interactive Showcase App

An interactive demo app showcasing all 5 modules is included in the example/ directory.

To run it:

cd example
flutter run

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🧪 Comprehensive Test Coverage

Every algorithm (Lakh/Crore grouping, Verhoeff checksum, PAN entity classification, PIN code resolution, phonetic transliteration, and vehicle plate regex) is backed by 55+ unit and widget tests:

flutter test

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📄 License

This package is released under the MIT License. See LICENSE for details.