Add support for trailing commas Records about code_builder HOT 7 CLOSED

import 'package:code_builder/code_builder.dart';

class CustomEmitter extends DartEmitter {
CustomEmitter() : super(Allocator.simplePrefixing(), true, false);

@OverRide
StringSink visitExpression(Expression expression, [StringSink? output]) {
var sink = output ?? StringBuffer();
if (expression is CodeExpression) {
expression.code.accept(this, sink);
} else if (expression is LiteralExpression) {
final value = expression.literal.toString();
if (value.startsWith("'") && value.endsWith("'")) {
sink.write('"' + value.substring(1, value.length - 1) + '"');
} else {
sink.write(value);
}
} else {
super.visitExpression(expression, sink);
}
return sink;
}

@OverRide
StringSink visitRecordLiteral(RecordLiteral literal, [StringSink? output]) {
var sink = output ?? StringBuffer();
sink.write('(');
var needsComma = false;
for (var field in literal.fields) {
if (needsComma) {
sink.write(', ');
}
field.accept(this, sink);
needsComma = true;
}
if (needsComma) {
sink.write(','); // Add trailing comma for named fields
}
sink.write(')');
return sink;
}
}

void main() {
var emitter = CustomEmitter();
var spec = Code('''
import 'package:lang_generator/lang_generator.dart';

@AppLangConfig(jsonExport: true)
@AppLangImporter(
path: "lib/app_lang_source.en_US.json",
locale: "en_US",
)
class AppLangSource {
var incomeTransaction = (
fields: (
amount: (tr_TR: "Fiyat", en_US: "Amount"),
paymentDate: (tr_TR: "Ödeme Tarihi", en_US: "Payment Date"),
),
actions: (
update: (tr_TR: "Düzenle", en_US: "Edit"),
detail: (tr_TR: "Detay", en_US: "Detail"),
addTag: (tr_TR: "Etiket Ekle", en_US: "Add Tag"),
),
validations: (
amount: (
notNull: (tr_TR: "Tutar girmelisiniz", en_US: "You must enter an amount"),
lessThen: (tr_TR: "Tutar 100'den küçük olmalı", en_US: "Amount must be less than 100"),
),
),
);

var expenseTransaction = (
fields: (
amount: (tr_TR: "Fiyat", en_US: "Amount"),
paymentDate: (tr_TR: "Ödeme Tarihi", en_US: "Payment Date"),
),
);
}
''');
print(spec.accept(emitter));
}

from code_builder.

The CustomEmitter class inherits from DartEmitter: -----
The visitExpression method overrides the default behavior to ensure double quotes are retained.
The visitRecordLiteral method is customized to add a trailing comma after each named field.

from code_builder.

@AkashKeote Thank you so much. It seems you are using different version of code_builder. But you gave me the idea and I did it.

code_builder: ^4.10.0

import 'package:code_builder/code_builder.dart';
import 'package:code_builder/src/specs/expression.dart';

// region [p]
class CustomEmitter extends DartEmitter {
  CustomEmitter()
      : super(
          allocator: Allocator.simplePrefixing(),
          orderDirectives: true,
          useNullSafetySyntax: false,
        );

  @override
  StringSink visitLiteralExpression(LiteralExpression expression, [StringSink? output]) {
    output ??= StringBuffer();
    final escaped = expression.literal.replaceAll('\\\'', '\'').replaceAll('\\n', '\n');

    if (escaped.startsWith("'") && escaped.endsWith("'")) {
      return output..write('"${escaped.substring(1, escaped.length - 1)}"');
    }

    return output..write(escaped);
  }

  @override
  StringSink visitLiteralRecordExpression(LiteralRecordExpression expression, [StringSink? output]) {
    final out = output ??= StringBuffer();
    out.write('(');
    _visitAll<Object?>(expression.positionalFieldValues, out, (value) {
      _acceptLiteral(value, out);
    });
    if (expression.namedFieldValues.isNotEmpty) {
      if (expression.positionalFieldValues.isNotEmpty) {
        out.write(', ');
      }
    } else if (expression.positionalFieldValues.length == 1) {
      out.write(',');
    }
    _visitAll<MapEntry<String, Object?>>(expression.namedFieldValues.entries, out, (entry) {
      out.write('${entry.key}: ');
      _acceptLiteral(entry.value, out);
    });
    if (expression.namedFieldValues.isNotEmpty) {
      out.write(',');
    }
    return out..write(')');
  }

  /// Helper method improving on [StringSink.writeAll].
  ///
  /// For every `Spec` in [elements], executing [visit].
  ///
  /// If [elements] is at least 2 elements, inserts [separator] delimiting them.
  StringSink _visitAll<T>(
    Iterable<T> elements,
    StringSink output,
    void Function(T) visit, [
    String separator = ', ',
  ]) {
    // Basically, this whole method is an improvement on
    //   output.writeAll(specs.map((s) => s.accept(visitor));
    //
    // ... which would allocate more StringBuffer(s) for a one-time use.
    if (elements.isEmpty) {
      return output;
    }
    final iterator = elements.iterator..moveNext();
    visit(iterator.current);
    while (iterator.moveNext()) {
      output.write(separator);
      visit(iterator.current);
    }
    return output;
  }

  void _acceptLiteral(Object? literalOrSpec, StringSink output) {
    if (literalOrSpec is Spec) {
      literalOrSpec.accept(this, output);
      return;
    }
    literal(literalOrSpec).accept(this, output);
  }
}

// endregion

from code_builder.

need your help how to contribute on the gssoc as my exam is over now and i am in 2nd year dont have much idea about pull request and fork button not here

from code_builder.

@AkashKeote

Fork Button on the home page of the repo.
You can make changes and then you can create pull request on your forked repo.

from code_builder.

thanku so much sir this will help me a lot

from code_builder.

@AkashKeote You are welcome. You helped me a lot, too. Thank you. 👍

from code_builder.