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code_generator.dart
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code_generator.dart
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import 'dart:io';
import 'package:vcore/vcore.dart';
import 'package:quiver/iterables.dart';
class VCoreCodeGenerator {
final bool includeBuildConstructor;
VCoreCodeGenerator({this.includeBuildConstructor: false});
void generatePackage(Package package, IOSink sink) {
sink..writeln('library ${package.name};')..writeln();
sink..writeln("""
import 'package:built_collection/built_collection.dart';
import 'package:built_json/built_json.dart';
import 'package:built_value/built_value.dart';
""")..writeln();
package.imports.forEach((i) {
sink.writeln("import '$i';");
});
sink..writeln("part '${package.name}.g.dart';")..writeln();
package.classifiers.forEach((c) {
generateClassifier(c, sink);
sink.writeln();
});
}
void generateClassifier(Classifier classifier, IOSink sink) {
if (classifier is ValueClass) {
generateValueClass(classifier, sink);
} else if (classifier is EnumClass) {
generateEnumClass(classifier, sink);
} else {
// oops
}
}
void generateEnumClass(EnumClass enumClass, IOSink sink) {
sink
..writeln('enum ${enumClass.name} { ${enumClass.literals.join(', ')} }')
..writeln();
}
void generateValueClass(ValueClass valueClass, IOSink sink) {
generateClass(valueClass, sink);
if (!valueClass.isAbstract) {
sink.writeln();
generateBuilder(valueClass, sink);
}
}
void generateClass(ValueClass valueClass, IOSink sink) {
if (valueClass.docComment != null) {
sink.writeln(
valueClass.docComment.split('\n').map((l) => '/// $l').join('\n'));
}
final className = valueClass.name;
final classNameLower =
className.substring(0, 1).toLowerCase() + className.substring(1);
sink.write('abstract class $className ');
final buildClassName =
valueClass.isAbstract ? [] : ['Built<$className, ${className}Builder>'];
// 'implements Built<$className, ${className}Builder>');
final superNames = valueClass.superTypes.map((c) => c.name);
final allImplementNames = concat([buildClassName, superNames]);
if (allImplementNames.isNotEmpty) {
sink..write('implements ')..write(allImplementNames.join(', '));
}
sink.writeln(' {');
if (!valueClass.isAbstract) {
sink.writeln('static final Serializer<$className> serializer'
' = _\$${classNameLower}Serializer;');
sink.writeln();
}
final properties = valueClass.isAbstract
? valueClass.properties
: valueClass.allProperties;
properties.forEach((p) {
if (p.isNullable) {
sink.writeln('@nullable');
}
sink.write('${p.type.name} get ${p.name}');
if (p.isDerived && !valueClass.isAbstract) {
sink.write(' => ${p.derivedExpression}');
}
sink.writeln(';');
});
sink.writeln();
if (!valueClass.isAbstract) {
final builderName = '${className}Builder';
sink..writeln('$className._();')..writeln();
sink.writeln(
'factory $className([updates(${className}Builder b)]) = _\$$className;');
sink.writeln();
if (includeBuildConstructor) {
_generateBuildConstructor(sink, className, valueClass, builderName);
}
}
sink.writeln('}');
}
void _generateBuildConstructor(IOSink sink, String className,
ValueClass valueClass, String builderName) {
sink.writeln('factory $className.build({');
final properties = valueClass.allProperties.where((p) => !p.isDerived);
final namedParams =
properties.map((p) => '${_getMaybeMappedClassName(p.type)} ${p.name}');
sink.writeln(namedParams.join(', '));
sink.writeln('}) {');
sink.writeln('return (new $builderName()');
properties.forEach((p) {
sink.write('..${p.name} = ${p.name}');
final defaultValue = _getDefaultValue(p);
if (defaultValue != null) {
sink.write(' ?? $defaultValue');
}
sink.writeln();
});
sink..writeln(').build();')..writeln('}');
}
void generateBuilder(ValueClass valueClass, IOSink sink) {
final className = valueClass.name;
final builderName = '${className}Builder';
// final classNameLower =
// className.substring(0, 1).toLowerCase() + className.substring(1);
sink.write('abstract class $builderName '
'implements Builder<$className, ${className}Builder>');
sink.writeln(' {');
valueClass.allProperties.where((p) => !p.isDerived).forEach((p) {
final propertyClassName = _getMaybeMappedClassName(p.type);
if (p.isNullable) {
sink.writeln('@nullable');
}
sink.write('$propertyClassName ${p.name}');
final defaultValue =
_getDefaultValue(p, propertyClassName: propertyClassName);
if (defaultValue != null) {
sink.write(' = $defaultValue');
}
sink.writeln(';');
});
sink.writeln();
sink..writeln('$builderName._();')..writeln();
sink.writeln('factory $builderName() = _\$$builderName;');
sink.writeln();
sink.writeln('}');
}
}
Object _getDefaultValue(Property p, {String propertyClassName}) {
final _propertyClassName =
propertyClassName ?? _getMaybeMappedClassName(p.type);
if (p.defaultValue != null) {
return p.defaultValue;
// TODO: dodgy way to detect it is a builder
} else if (_propertyClassName.contains('Builder')) {
return 'new $_propertyClassName()';
} else
return null;
}
String _getMaybeMappedClassName(Classifier classifier) {
if (classifier is GenericType) {
final genericTypeValues = classifier.genericTypeValues;
if (classifier.base == builtSet) {
return 'SetBuilder<${genericTypeValues[builtSet.genericTypes.first].name}>';
} else if (classifier.base == builtMap) {
final genericTypes = builtMap.genericTypes;
return 'MapBuilder<${genericTypeValues[genericTypes.first].name}, '
'${genericTypeValues[genericTypes.last].name}>';
}
} else if (classifier is ValueClass && !classifier.isAbstract) {
return '${classifier.name}Builder';
}
return classifier.name;
}