Codex Bot
47 lines
1.5 KiB
Dart
47 lines
1.5 KiB
Dart
const int kAssetDecimals = 8;
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const String kDefaultAssetSymbol = 'PEY';
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String formatAtomicAmount(int atomic, {int decimals = kAssetDecimals}) {
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final isNegative = atomic < 0;
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final value = BigInt.from(atomic).abs();
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final base = BigInt.from(10).pow(decimals);
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final whole = value ~/ base;
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final fraction = value % base;
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final fractionStr = fraction.toString().padLeft(decimals, '0');
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final trimmed = fractionStr.replaceFirst(RegExp(r'0+$'), '');
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final result = trimmed.isEmpty ? whole.toString() : '${whole.toString()}.${trimmed}';
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return isNegative ? '-$result' : result;
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}
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int? parseAtomicAmount(String input, {int decimals = kAssetDecimals}) {
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final raw = input.trim();
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if (raw.isEmpty) {
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return null;
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}
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final normalized = raw.replaceAll(',', '.');
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if (normalized.startsWith('-')) {
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return null;
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}
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final parts = normalized.split('.');
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if (parts.length > 2) {
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return null;
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}
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final wholePart = parts[0].isEmpty ? '0' : parts[0];
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if (!RegExp(r'^\d+$').hasMatch(wholePart)) {
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return null;
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}
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final fractionPart = parts.length == 2 ? parts[1] : '';
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if (!RegExp(r'^\d*$').hasMatch(fractionPart)) {
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return null;
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}
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if (fractionPart.length > decimals) {
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return null;
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}
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final paddedFraction = fractionPart.padRight(decimals, '0');
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final whole = BigInt.parse(wholePart);
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final fraction = paddedFraction.isEmpty ? BigInt.zero : BigInt.parse(paddedFraction);
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final base = BigInt.from(10).pow(decimals);
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final total = whole * base + fraction;
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return total.toInt();
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}
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