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import {DocComment} from ast;

// == Compilation units ==

struct JavaCompilationUnit {
    field packageName: List[String];
    field typeDeclaration: JavaTypeDeclaration;
}

// == Type declarations ==

sum JavaTypeDeclaration {
    variant JavaClassDeclaration;
    variant JavaInterfaceDeclaration;
    variant JavaRecordDeclaration;

    field name: String;
    field customArea: JavaCustomArea;
}

struct JavaClassDeclaration {
    field name: String;
    field implementsTypes: List[JavaTypeRef];
    field body: List[JavaClassBodyDeclaration];
    field customArea: JavaCustomArea;
    field docComment: DocComment;
}

struct JavaInterfaceDeclaration {
    field name: String;
    field openness: JavaInterfaceOpenness;
    field permitsTypes: List[JavaTypeRef];
    field body: List[JavaClassBodyDeclaration];
    field customArea: JavaCustomArea;
    field docComment: DocComment;
}

native JavaInterfaceOpenness {
}

struct JavaRecordComponent {
    field type: JavaTypeRef;
    field name: String;
}

struct JavaRecordDeclaration {
    field name: String;
    field components: List[JavaRecordComponent];
    field implementsTypes: List[JavaTypeRef];
    field body: List[JavaClassBodyDeclaration];
    field customArea: JavaCustomArea;
    field docComment: DocComment;
}

// == Type declaration bodies ==

// TODO: allow JavaClassBodyDeclaration to extend JavaTypeDeclaration
sum JavaClassBodyDeclaration {
    variant JavaClassDeclaration;
    variant JavaConstructorDeclaration;
    variant JavaFieldDeclaration;
    variant JavaInterfaceDeclaration;
    variant JavaMethodDeclaration;
    variant JavaRecordDeclaration;
}

struct JavaConstructorDeclaration {
    field typeName: String;
    field visibility: JavaVisibility;
    field params: List[JavaParam];
    field body: JavaBlock;
}

struct JavaFieldDeclaration {
    field visibility: JavaVisibility;
    field type: JavaTypeRef;
    field name: String;
}

struct JavaMethodDeclaration {
    field name: String;
    field visibility: JavaVisibility;
    field kind: JavaMethodKind;
    field returnType: JavaTypeRef;
    field params: List[JavaParam];
    field body: Option[JavaBlock];
}

// == Methods ==

native JavaMethodKind {
}

struct JavaParam {
    field type: JavaTypeRef;
    field name: String;
}

// == Type references ==

native JavaTypeRef {
}

// == Visibility ==

native JavaVisibility {
}

// == Statements ==

struct JavaBlock {
    field statements: List[JavaBlockStatement];
}

sum JavaBlockStatement {
    variant JavaExpressionStatement;
    variant JavaReturn;
}

struct JavaExpressionStatement {
    field expression: JavaExpression;
}

struct JavaReturn {
    field value: JavaExpression;
}

// == Expressions ==

sum JavaExpression {
    variant JavaAssignment;
    variant JavaFieldAccess;
    variant JavaIntegerLiteral;
    variant JavaMethodCall;
    variant JavaMethodRef;
    variant JavaNewExpression;
    variant JavaNullLiteral;
    variant JavaRef;
    variant JavaStaticFieldAccess;
    variant JavaStaticMethodCall;
    variant JavaStringLiteral;
}

struct JavaAssignment {
    field left: JavaExpression;
    field right: JavaExpression;
}

struct JavaFieldAccess {
    field receiver: JavaExpression;
    field fieldName: String;
}

struct JavaIntegerLiteral {
    field value: Int64;
}

struct JavaMethodCall {
    field receiver: JavaExpression;
    field methodName: String;
    field args: List[JavaExpression];
}

struct JavaMethodRef {
    field type: JavaTypeRef;
    field methodName: String;
}

struct JavaNewExpression {
    field type: JavaTypeRef;
    field args: List[JavaExpression];
}

struct JavaNullLiteral {
}

struct JavaRef {
    field name: String;
}

struct JavaStaticFieldAccess {
    field type: JavaTypeRef;
    field fieldName: String;
}

struct JavaStaticMethodCall {
    field type: JavaTypeRef;
    field methodName: String;
    field args: List[JavaExpression];
}

struct JavaStringLiteral {
    field value: String;
}

// == Custom areas ==

struct JavaCustomArea {
    field type: JavaTypeRef;
    field name: String;
}