/*
 * Copyright (C) 2007-2010 Júlio Vilmar Gesser.
 * Copyright (C) 2011, 2013-2024 The JavaParser Team.
 *
 * This file is part of JavaParser.
 *
 * JavaParser can be used either under the terms of
 * a) the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 * b) the terms of the Apache License
 *
 * You should have received a copy of both licenses in LICENCE.LGPL and
 * LICENCE.APACHE. Please refer to those files for details.
 *
 * JavaParser is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 */
package com.github.javaparser.printer;

import static com.github.javaparser.GeneratedJavaParserConstants.*;
import static com.github.javaparser.ast.observer.ObservableProperty.*;
import static com.github.javaparser.printer.concretesyntaxmodel.CsmConditional.Condition.FLAG;
import static com.github.javaparser.printer.concretesyntaxmodel.CsmConditional.Condition.IS_EMPTY;
import static com.github.javaparser.printer.concretesyntaxmodel.CsmConditional.Condition.IS_NOT_EMPTY;
import static com.github.javaparser.printer.concretesyntaxmodel.CsmConditional.Condition.IS_PRESENT;
import static com.github.javaparser.printer.concretesyntaxmodel.CsmElement.*;

import com.github.javaparser.GeneratedJavaParserConstants;
import com.github.javaparser.ast.*;
import com.github.javaparser.ast.body.*;
import com.github.javaparser.ast.comments.Comment;
import com.github.javaparser.ast.expr.*;
import com.github.javaparser.ast.modules.*;
import com.github.javaparser.ast.observer.ObservableProperty;
import com.github.javaparser.ast.stmt.*;
import com.github.javaparser.ast.type.*;
import com.github.javaparser.metamodel.JavaParserMetaModel;
import com.github.javaparser.printer.concretesyntaxmodel.CsmConditional;
import com.github.javaparser.printer.concretesyntaxmodel.CsmElement;
import com.github.javaparser.printer.concretesyntaxmodel.CsmMix;
import java.util.*;
import java.util.stream.Collectors;

/**
 * The Concrete Syntax Model for a single node type. It knows the syntax used to represent a certain element in Java
 * code.
 */
public class ConcreteSyntaxModel {

    private static final Map<Class, CsmElement> concreteSyntaxModelByClass = new HashMap<>();

    private static Optional<String> initializationError;

    private static CsmElement modifiers() {
        return list(ObservableProperty.MODIFIERS, space(), none(), space());
    }

    /**
     * Build a mix collecting all the elements specified.
     */
    private static CsmElement mix(CsmElement... elements) {
        return new CsmMix(Arrays.asList(elements));
    }

    private static CsmElement memberAnnotations() {
        return list(ObservableProperty.ANNOTATIONS, newline(), none(), newline());
    }

    private static CsmElement annotations() {
        return list(ObservableProperty.ANNOTATIONS, space(), none(), newline());
    }

    private static CsmElement onlineAnnotations() {
        return list(ObservableProperty.ANNOTATIONS, space(), none(), space());
    }

    private static CsmElement typeParameters() {
        return list(
                ObservableProperty.TYPE_PARAMETERS,
                sequence(comma(), space()),
                token(GeneratedJavaParserConstants.LT),
                sequence(token(GeneratedJavaParserConstants.GT), space()));
    }

    private static CsmElement typeArguments() {
        return list(
                ObservableProperty.TYPE_ARGUMENTS,
                sequence(comma(), space()),
                token(GeneratedJavaParserConstants.LT),
                sequence(token(GeneratedJavaParserConstants.GT)));
    }

    static {
        // /
        // / Body
        // /
        concreteSyntaxModelByClass.put(
                AnnotationDeclaration.class,
                sequence(
                        comment(),
                        memberAnnotations(),
                        modifiers(),
                        token(GeneratedJavaParserConstants.AT),
                        token(GeneratedJavaParserConstants.INTERFACE),
                        space(),
                        child(ObservableProperty.NAME),
                        space(),
                        token(LBRACE),
                        newline(),
                        indent(),
                        list(ObservableProperty.MEMBERS, newline(), none(), none(), newline()),
                        unindent(),
                        token(RBRACE)));
        concreteSyntaxModelByClass.put(
                AnnotationMemberDeclaration.class,
                sequence(
                        comment(),
                        memberAnnotations(),
                        modifiers(),
                        child(ObservableProperty.TYPE),
                        space(),
                        child(ObservableProperty.NAME),
                        token(LPAREN),
                        token(RPAREN),
                        conditional(
                                ObservableProperty.DEFAULT_VALUE,
                                IS_PRESENT,
                                sequence(
                                        space(),
                                        token(GeneratedJavaParserConstants._DEFAULT),
                                        space(),
                                        child(DEFAULT_VALUE))),
                        semicolon()));
        concreteSyntaxModelByClass.put(
                ClassOrInterfaceDeclaration.class,
                sequence(
                        comment(),
                        memberAnnotations(),
                        modifiers(),
                        conditional(
                                ObservableProperty.INTERFACE,
                                FLAG,
                                token(GeneratedJavaParserConstants.INTERFACE),
                                token(GeneratedJavaParserConstants.CLASS)),
                        space(),
                        child(ObservableProperty.NAME),
                        list(
                                TYPE_PARAMETERS,
                                sequence(comma(), space()),
                                string(GeneratedJavaParserConstants.LT),
                                string(GeneratedJavaParserConstants.GT)),
                        list(
                                ObservableProperty.EXTENDED_TYPES,
                                sequence(string(GeneratedJavaParserConstants.COMMA), space()),
                                sequence(space(), token(GeneratedJavaParserConstants.EXTENDS), space()),
                                none()),
                        list(
                                ObservableProperty.IMPLEMENTED_TYPES,
                                sequence(string(GeneratedJavaParserConstants.COMMA), space()),
                                sequence(space(), token(GeneratedJavaParserConstants.IMPLEMENTS), space()),
                                none()),
                        space(),
                        list(
                                ObservableProperty.PERMITTED_TYPES,
                                sequence(string(GeneratedJavaParserConstants.COMMA), space()),
                                sequence(space(), token(GeneratedJavaParserConstants.PERMITS), space()),
                                none()),
                        block(sequence(
                                newline(),
                                list(
                                        ObservableProperty.MEMBERS,
                                        sequence(newline(), newline()),
                                        newline(),
                                        newline())))));
        concreteSyntaxModelByClass.put(
                ConstructorDeclaration.class,
                sequence(
                        comment(),
                        memberAnnotations(),
                        modifiers(),
                        typeParameters(),
                        child(ObservableProperty.NAME),
                        token(GeneratedJavaParserConstants.LPAREN),
                        list(ObservableProperty.PARAMETERS, sequence(comma(), space()), none(), none()),
                        token(GeneratedJavaParserConstants.RPAREN),
                        list(
                                ObservableProperty.THROWN_EXCEPTIONS,
                                sequence(comma(), space()),
                                sequence(space(), token(GeneratedJavaParserConstants.THROWS), space()),
                                none()),
                        space(),
                        child(ObservableProperty.BODY)));
        concreteSyntaxModelByClass.put(
                RecordDeclaration.class,
                sequence(
                        comment(),
                        memberAnnotations(),
                        modifiers(),
                        token(GeneratedJavaParserConstants.RECORD),
                        space(),
                        child(ObservableProperty.NAME),
                        token(GeneratedJavaParserConstants.LPAREN),
                        list(ObservableProperty.PARAMETERS, sequence(comma(), space()), none(), none()),
                        token(GeneratedJavaParserConstants.RPAREN),
                        list(
                                TYPE_PARAMETERS,
                                sequence(comma(), space()),
                                string(GeneratedJavaParserConstants.LT),
                                string(GeneratedJavaParserConstants.GT)),
                        list(
                                ObservableProperty.IMPLEMENTED_TYPES,
                                sequence(string(GeneratedJavaParserConstants.COMMA), space()),
                                sequence(space(), token(GeneratedJavaParserConstants.IMPLEMENTS), space()),
                                none()),
                        space(),
                        block(sequence(
                                newline(),
                                list(
                                        ObservableProperty.MEMBERS,
                                        sequence(newline(), newline()),
                                        newline(),
                                        newline())))));
        concreteSyntaxModelByClass.put(
                CompactConstructorDeclaration.class,
                sequence(
                        comment(),
                        memberAnnotations(),
                        modifiers(),
                        typeParameters(),
                        child(ObservableProperty.NAME),
                        list(
                                ObservableProperty.THROWN_EXCEPTIONS,
                                sequence(comma(), space()),
                                sequence(space(), token(GeneratedJavaParserConstants.THROWS), space()),
                                none()),
                        space(),
                        child(ObservableProperty.BODY)));
        concreteSyntaxModelByClass.put(
                EnumConstantDeclaration.class,
                sequence(
                        comment(),
                        memberAnnotations(),
                        child(ObservableProperty.NAME),
                        list(
                                ObservableProperty.ARGUMENTS,
                                sequence(comma(), space()),
                                token(GeneratedJavaParserConstants.LPAREN),
                                token(GeneratedJavaParserConstants.RPAREN)),
                        conditional(
                                CLASS_BODY,
                                IS_NOT_EMPTY,
                                sequence(
                                        space(),
                                        token(GeneratedJavaParserConstants.LBRACE),
                                        newline(),
                                        indent(),
                                        newline(),
                                        list(ObservableProperty.CLASS_BODY, newline(), newline(), none(), newline()),
                                        unindent(),
                                        token(RBRACE),
                                        newline()))));
        concreteSyntaxModelByClass.put(
                EnumDeclaration.class,
                sequence(
                        comment(),
                        annotations(),
                        modifiers(),
                        token(GeneratedJavaParserConstants.ENUM),
                        space(),
                        child(ObservableProperty.NAME),
                        list(
                                ObservableProperty.IMPLEMENTED_TYPES,
                                sequence(comma(), space()),
                                sequence(space(), token(GeneratedJavaParserConstants.IMPLEMENTS), space()),
                                none()),
                        space(),
                        token(GeneratedJavaParserConstants.LBRACE),
                        newline(),
                        indent(),
                        newline(),
                        list(ObservableProperty.ENTRIES, sequence(comma(), newline()), none(), none()),
                        conditional(
                                ObservableProperty.MEMBERS,
                                IS_EMPTY,
                                conditional(ObservableProperty.ENTRIES, IS_NOT_EMPTY, newline()),
                                sequence(
                                        semicolon(),
                                        newline(),
                                        newline(),
                                        list(ObservableProperty.MEMBERS, newline(), newline(), none(), newline()))),
                        unindent(),
                        token(RBRACE)));
        concreteSyntaxModelByClass.put(
                FieldDeclaration.class,
                sequence(
                        orphanCommentsBeforeThis(),
                        comment(),
                        mix(annotations(), modifiers()),
                        conditional(
                                ObservableProperty.VARIABLES,
                                IS_NOT_EMPTY,
                                child(ObservableProperty.MAXIMUM_COMMON_TYPE)),
                        space(),
                        list(ObservableProperty.VARIABLES, sequence(comma(), space())),
                        semicolon()));
        concreteSyntaxModelByClass.put(
                InitializerDeclaration.class,
                sequence(
                        comment(),
                        conditional(
                                ObservableProperty.STATIC,
                                FLAG,
                                sequence(token(GeneratedJavaParserConstants.STATIC), space())),
                        child(ObservableProperty.BODY)));
        concreteSyntaxModelByClass.put(
                MethodDeclaration.class,
                sequence(
                        orphanCommentsBeforeThis(),
                        comment(),
                        mix(memberAnnotations(), modifiers()),
                        typeParameters(),
                        child(ObservableProperty.TYPE),
                        space(),
                        child(ObservableProperty.NAME),
                        token(GeneratedJavaParserConstants.LPAREN),
                        conditional(
                                ObservableProperty.RECEIVER_PARAMETER,
                                IS_PRESENT,
                                sequence(child(ObservableProperty.RECEIVER_PARAMETER), comma(), space())),
                        list(ObservableProperty.PARAMETERS, sequence(comma(), space()), none(), none()),
                        token(GeneratedJavaParserConstants.RPAREN),
                        list(
                                ObservableProperty.THROWN_EXCEPTIONS,
                                sequence(comma(), space()),
                                sequence(space(), token(GeneratedJavaParserConstants.THROWS), space()),
                                none()),
                        conditional(
                                ObservableProperty.BODY,
                                IS_PRESENT,
                                sequence(space(), child(ObservableProperty.BODY)),
                                semicolon())));
        concreteSyntaxModelByClass.put(
                Parameter.class,
                sequence(
                        comment(),
                        onlineAnnotations(),
                        modifiers(),
                        child(ObservableProperty.TYPE),
                        conditional(
                                ObservableProperty.VAR_ARGS,
                                FLAG,
                                sequence(
                                        list(ObservableProperty.VAR_ARGS_ANNOTATIONS, space(), none(), none()),
                                        token(GeneratedJavaParserConstants.ELLIPSIS))),
                        space(),
                        child(ObservableProperty.NAME)));
        concreteSyntaxModelByClass.put(
                ReceiverParameter.class,
                sequence(
                        comment(),
                        onlineAnnotations(),
                        child(ObservableProperty.TYPE),
                        space(),
                        child(ObservableProperty.NAME)));
        concreteSyntaxModelByClass.put(
                VariableDeclarator.class,
                sequence(
                        /* FIXME: we should introduce a derived property */
                        comment(), /* list(ObservableProperty.EXTRA_ARRAY_LEVELS), */
                        child(ObservableProperty.NAME),
                        conditional(
                                ObservableProperty.INITIALIZER,
                                IS_PRESENT,
                                sequence(
                                        space(),
                                        token(GeneratedJavaParserConstants.ASSIGN),
                                        space(),
                                        child(ObservableProperty.INITIALIZER)))));
        // /
        // / Expressions
        // /
        concreteSyntaxModelByClass.put(
                ArrayAccessExpr.class,
                sequence(
                        comment(),
                        child(ObservableProperty.NAME),
                        token(GeneratedJavaParserConstants.LBRACKET),
                        child(ObservableProperty.INDEX),
                        token(GeneratedJavaParserConstants.RBRACKET)));
        concreteSyntaxModelByClass.put(
                ArrayCreationExpr.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.NEW),
                        space(),
                        child(ObservableProperty.ELEMENT_TYPE),
                        list(ObservableProperty.LEVELS),
                        conditional(
                                ObservableProperty.INITIALIZER,
                                IS_PRESENT,
                                sequence(space(), child(ObservableProperty.INITIALIZER)))));
        concreteSyntaxModelByClass.put(
                ArrayInitializerExpr.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.LBRACE),
                        list(ObservableProperty.VALUES, sequence(comma(), space()), space(), space()),
                        orphanCommentsEnding(),
                        token(RBRACE)));
        concreteSyntaxModelByClass.put(
                AssignExpr.class,
                sequence(
                        comment(),
                        child(ObservableProperty.TARGET),
                        space(),
                        attribute(ObservableProperty.OPERATOR),
                        space(),
                        child(ObservableProperty.VALUE)));
        concreteSyntaxModelByClass.put(
                BinaryExpr.class,
                sequence(
                        comment(),
                        child(ObservableProperty.LEFT),
                        space(),
                        attribute(ObservableProperty.OPERATOR),
                        space(),
                        child(ObservableProperty.RIGHT)));
        concreteSyntaxModelByClass.put(BooleanLiteralExpr.class, sequence(comment(), attribute(VALUE)));
        concreteSyntaxModelByClass.put(
                CastExpr.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.LPAREN),
                        child(ObservableProperty.TYPE),
                        token(GeneratedJavaParserConstants.RPAREN),
                        space(),
                        child(ObservableProperty.EXPRESSION)));
        concreteSyntaxModelByClass.put(CharLiteralExpr.class, sequence(comment(), charToken(ObservableProperty.VALUE)));
        concreteSyntaxModelByClass.put(
                ClassExpr.class,
                sequence(
                        comment(),
                        child(ObservableProperty.TYPE),
                        token(GeneratedJavaParserConstants.DOT),
                        token(GeneratedJavaParserConstants.CLASS)));
        concreteSyntaxModelByClass.put(
                ConditionalExpr.class,
                sequence(
                        comment(),
                        child(ObservableProperty.CONDITION),
                        space(),
                        token(GeneratedJavaParserConstants.HOOK),
                        space(),
                        child(ObservableProperty.THEN_EXPR),
                        space(),
                        token(GeneratedJavaParserConstants.COLON),
                        space(),
                        child(ObservableProperty.ELSE_EXPR)));
        concreteSyntaxModelByClass.put(
                DoubleLiteralExpr.class, sequence(comment(), attribute(ObservableProperty.VALUE)));
        concreteSyntaxModelByClass.put(
                EnclosedExpr.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.LPAREN),
                        child(ObservableProperty.INNER),
                        token(GeneratedJavaParserConstants.RPAREN)));
        concreteSyntaxModelByClass.put(
                FieldAccessExpr.class,
                sequence(
                        comment(),
                        child(SCOPE),
                        token(GeneratedJavaParserConstants.DOT),
                        child(ObservableProperty.NAME)));
        concreteSyntaxModelByClass.put(
                InstanceOfExpr.class,
                sequence(
                        comment(),
                        child(ObservableProperty.EXPRESSION),
                        space(),
                        token(GeneratedJavaParserConstants.INSTANCEOF),
                        space(),
                        child(ObservableProperty.TYPE)));
        concreteSyntaxModelByClass.put(
                IntegerLiteralExpr.class, sequence(comment(), attribute(ObservableProperty.VALUE)));
        concreteSyntaxModelByClass.put(
                LambdaExpr.class,
                sequence(
                        comment(),
                        conditional(
                                ObservableProperty.ENCLOSING_PARAMETERS,
                                FLAG,
                                token(GeneratedJavaParserConstants.LPAREN)),
                        list(ObservableProperty.PARAMETERS, sequence(comma(), space())),
                        conditional(
                                ObservableProperty.ENCLOSING_PARAMETERS,
                                FLAG,
                                token(GeneratedJavaParserConstants.RPAREN)),
                        space(),
                        token(GeneratedJavaParserConstants.ARROW),
                        space(),
                        conditional(
                                ObservableProperty.EXPRESSION_BODY,
                                IS_PRESENT,
                                child(ObservableProperty.EXPRESSION_BODY),
                                child(ObservableProperty.BODY))));
        concreteSyntaxModelByClass.put(LongLiteralExpr.class, sequence(comment(), attribute(ObservableProperty.VALUE)));
        concreteSyntaxModelByClass.put(
                MarkerAnnotationExpr.class,
                sequence(comment(), token(GeneratedJavaParserConstants.AT), attribute(ObservableProperty.NAME)));
        concreteSyntaxModelByClass.put(
                MemberValuePair.class,
                sequence(
                        comment(),
                        child(ObservableProperty.NAME),
                        space(),
                        token(GeneratedJavaParserConstants.ASSIGN),
                        space(),
                        child(ObservableProperty.VALUE)));
        concreteSyntaxModelByClass.put(
                MethodCallExpr.class,
                sequence(
                        comment(),
                        conditional(
                                ObservableProperty.SCOPE,
                                IS_PRESENT,
                                sequence(child(ObservableProperty.SCOPE), token(GeneratedJavaParserConstants.DOT))),
                        typeArguments(),
                        child(ObservableProperty.NAME),
                        token(GeneratedJavaParserConstants.LPAREN),
                        list(ObservableProperty.ARGUMENTS, sequence(comma(), space()), none(), none()),
                        token(GeneratedJavaParserConstants.RPAREN)));
        concreteSyntaxModelByClass.put(
                MethodReferenceExpr.class,
                sequence(
                        comment(),
                        child(ObservableProperty.SCOPE),
                        token(GeneratedJavaParserConstants.DOUBLECOLON),
                        typeArguments(),
                        attribute(ObservableProperty.IDENTIFIER)));
        concreteSyntaxModelByClass.put(Modifier.class, attribute(ObservableProperty.KEYWORD));
        concreteSyntaxModelByClass.put(
                Name.class,
                sequence(
                        comment(),
                        conditional(
                                ObservableProperty.QUALIFIER,
                                IS_PRESENT,
                                sequence(child(ObservableProperty.QUALIFIER), token(GeneratedJavaParserConstants.DOT))),
                        attribute(ObservableProperty.IDENTIFIER),
                        orphanCommentsEnding()));
        concreteSyntaxModelByClass.put(
                NameExpr.class, sequence(comment(), child(ObservableProperty.NAME), orphanCommentsEnding()));
        concreteSyntaxModelByClass.put(
                NormalAnnotationExpr.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.AT),
                        child(ObservableProperty.NAME),
                        conditional(ObservableProperty.PAIRS, IS_NOT_EMPTY, token(GeneratedJavaParserConstants.LPAREN)),
                        list(ObservableProperty.PAIRS, sequence(comma(), space())),
                        conditional(
                                ObservableProperty.PAIRS, IS_NOT_EMPTY, token(GeneratedJavaParserConstants.RPAREN))));
        concreteSyntaxModelByClass.put(
                NullLiteralExpr.class, sequence(comment(), token(GeneratedJavaParserConstants.NULL)));
        concreteSyntaxModelByClass.put(
                ObjectCreationExpr.class,
                sequence(
                        comment(),
                        conditional(
                                ObservableProperty.SCOPE,
                                IS_PRESENT,
                                sequence(child(ObservableProperty.SCOPE), token(GeneratedJavaParserConstants.DOT))),
                        token(GeneratedJavaParserConstants.NEW),
                        space(),
                        list(ObservableProperty.TYPE_ARGUMENTS, sequence(comma(), space()), token(LT), token(GT)),
                        conditional(ObservableProperty.TYPE_ARGUMENTS, IS_NOT_EMPTY, space()),
                        child(ObservableProperty.TYPE),
                        token(GeneratedJavaParserConstants.LPAREN),
                        list(ObservableProperty.ARGUMENTS, sequence(comma(), space()), none(), none()),
                        token(GeneratedJavaParserConstants.RPAREN),
                        conditional(
                                ObservableProperty.ANONYMOUS_CLASS_BODY,
                                IS_PRESENT,
                                sequence(
                                        space(),
                                        token(LBRACE),
                                        newline(),
                                        indent(),
                                        list(
                                                ObservableProperty.ANONYMOUS_CLASS_BODY,
                                                newline(),
                                                newline(),
                                                newline(),
                                                newline()),
                                        unindent(),
                                        token(RBRACE)))));
        concreteSyntaxModelByClass.put(
                RecordPatternExpr.class,
                sequence(
                        comment(),
                        child(ObservableProperty.TYPE),
                        space(),
                        token(GeneratedJavaParserConstants.LPAREN),
                        list(ObservableProperty.PATTERN_LIST, sequence(comma(), space()), none(), none()),
                        token(GeneratedJavaParserConstants.RPAREN)));
        concreteSyntaxModelByClass.put(SimpleName.class, attribute(ObservableProperty.IDENTIFIER));
        concreteSyntaxModelByClass.put(
                SingleMemberAnnotationExpr.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.AT),
                        child(ObservableProperty.NAME),
                        token(GeneratedJavaParserConstants.LPAREN),
                        child(ObservableProperty.MEMBER_VALUE),
                        token(GeneratedJavaParserConstants.RPAREN)));
        concreteSyntaxModelByClass.put(
                StringLiteralExpr.class, sequence(comment(), stringToken(ObservableProperty.VALUE)));
        concreteSyntaxModelByClass.put(
                SuperExpr.class,
                sequence(
                        comment(),
                        conditional(
                                TYPE_NAME,
                                IS_PRESENT,
                                sequence(child(TYPE_NAME), token(GeneratedJavaParserConstants.DOT))),
                        token(GeneratedJavaParserConstants.SUPER)));
        concreteSyntaxModelByClass.put(
                TextBlockLiteralExpr.class, sequence(comment(), textBlockToken(ObservableProperty.VALUE)));
        concreteSyntaxModelByClass.put(
                TypePatternExpr.class,
                sequence(child(ObservableProperty.TYPE), space(), child(ObservableProperty.NAME)));
        concreteSyntaxModelByClass.put(
                ThisExpr.class,
                sequence(
                        comment(),
                        conditional(
                                TYPE_NAME,
                                IS_PRESENT,
                                sequence(child(TYPE_NAME), token(GeneratedJavaParserConstants.DOT))),
                        token(GeneratedJavaParserConstants.THIS)));
        concreteSyntaxModelByClass.put(TypeExpr.class, sequence(comment(), child(ObservableProperty.TYPE)));
        concreteSyntaxModelByClass.put(
                UnaryExpr.class,
                sequence(
                        conditional(ObservableProperty.PREFIX, FLAG, attribute(ObservableProperty.OPERATOR)),
                        child(ObservableProperty.EXPRESSION),
                        conditional(ObservableProperty.POSTFIX, FLAG, attribute(ObservableProperty.OPERATOR))));
        concreteSyntaxModelByClass.put(
                VariableDeclarationExpr.class,
                sequence(
                        comment(),
                        onlineAnnotations(),
                        modifiers(),
                        child(ObservableProperty.MAXIMUM_COMMON_TYPE),
                        space(),
                        list(ObservableProperty.VARIABLES, sequence(comma(), space()))));
        // /
        // / Statements
        // /
        concreteSyntaxModelByClass.put(
                AssertStmt.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.ASSERT),
                        space(),
                        child(ObservableProperty.CHECK),
                        conditional(
                                ObservableProperty.MESSAGE,
                                IS_PRESENT,
                                sequence(
                                        space(),
                                        token(GeneratedJavaParserConstants.COLON),
                                        space(),
                                        child(ObservableProperty.MESSAGE))),
                        semicolon()));
        concreteSyntaxModelByClass.put(
                BlockStmt.class,
                sequence(
                        orphanCommentsBeforeThis(),
                        comment(),
                        token(GeneratedJavaParserConstants.LBRACE),
                        newline(),
                        list(ObservableProperty.STATEMENTS, newline(), indent(), sequence(newline(), unindent())),
                        orphanCommentsEnding(),
                        token(RBRACE)));
        concreteSyntaxModelByClass.put(
                BreakStmt.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.BREAK),
                        conditional(
                                ObservableProperty.LABEL,
                                IS_PRESENT,
                                sequence(space(), child(ObservableProperty.LABEL))),
                        semicolon()));
        concreteSyntaxModelByClass.put(
                CatchClause.class,
                sequence(
                        comment(),
                        space(),
                        token(GeneratedJavaParserConstants.CATCH),
                        space(),
                        token(LPAREN),
                        child(ObservableProperty.PARAMETER),
                        token(RPAREN),
                        space(),
                        child(BODY)));
        concreteSyntaxModelByClass.put(
                ContinueStmt.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.CONTINUE),
                        conditional(
                                ObservableProperty.LABEL,
                                IS_PRESENT,
                                sequence(space(), child(ObservableProperty.LABEL))),
                        semicolon()));
        concreteSyntaxModelByClass.put(
                DoStmt.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.DO),
                        space(),
                        child(ObservableProperty.BODY),
                        space(),
                        token(GeneratedJavaParserConstants.WHILE),
                        space(),
                        token(GeneratedJavaParserConstants.LPAREN),
                        child(ObservableProperty.CONDITION),
                        token(GeneratedJavaParserConstants.RPAREN),
                        semicolon()));
        concreteSyntaxModelByClass.put(
                EmptyStmt.class, sequence(comment(), token(GeneratedJavaParserConstants.SEMICOLON)));
        concreteSyntaxModelByClass.put(
                UnparsableStmt.class, sequence(comment(), token(GeneratedJavaParserConstants.SEMICOLON)));
        concreteSyntaxModelByClass.put(
                ExplicitConstructorInvocationStmt.class,
                sequence(
                        comment(),
                        conditional(
                                ObservableProperty.THIS,
                                FLAG,
                                sequence(typeArguments(), token(GeneratedJavaParserConstants.THIS)),
                                sequence(
                                        conditional(
                                                ObservableProperty.EXPRESSION,
                                                IS_PRESENT,
                                                sequence(
                                                        child(ObservableProperty.EXPRESSION),
                                                        token(GeneratedJavaParserConstants.DOT))),
                                        typeArguments(),
                                        token(GeneratedJavaParserConstants.SUPER))),
                        token(GeneratedJavaParserConstants.LPAREN),
                        list(ObservableProperty.ARGUMENTS, sequence(comma(), space())),
                        token(GeneratedJavaParserConstants.RPAREN),
                        semicolon()));
        concreteSyntaxModelByClass.put(
                ExpressionStmt.class,
                sequence(orphanCommentsBeforeThis(), comment(), child(ObservableProperty.EXPRESSION), semicolon()));
        concreteSyntaxModelByClass.put(
                ForEachStmt.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.FOR),
                        space(),
                        token(GeneratedJavaParserConstants.LPAREN),
                        child(ObservableProperty.VARIABLE),
                        space(),
                        token(GeneratedJavaParserConstants.COLON),
                        space(),
                        child(ObservableProperty.ITERABLE),
                        token(GeneratedJavaParserConstants.RPAREN),
                        space(),
                        child(ObservableProperty.BODY)));
        concreteSyntaxModelByClass.put(
                ForStmt.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.FOR),
                        space(),
                        token(GeneratedJavaParserConstants.LPAREN),
                        list(ObservableProperty.INITIALIZATION, sequence(comma(), space())),
                        semicolon(),
                        space(),
                        child(ObservableProperty.COMPARE),
                        semicolon(),
                        space(),
                        list(ObservableProperty.UPDATE, sequence(comma(), space())),
                        token(GeneratedJavaParserConstants.RPAREN),
                        space(),
                        child(ObservableProperty.BODY)));
        concreteSyntaxModelByClass.put(
                IfStmt.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.IF),
                        space(),
                        token(GeneratedJavaParserConstants.LPAREN),
                        child(ObservableProperty.CONDITION),
                        token(GeneratedJavaParserConstants.RPAREN),
                        conditional(
                                ObservableProperty.THEN_BLOCK,
                                CsmConditional.Condition.FLAG,
                                sequence(
                                        space(),
                                        child(ObservableProperty.THEN_STMT),
                                        conditional(ObservableProperty.ELSE_STMT, IS_PRESENT, space())),
                                sequence(
                                        newline(),
                                        indent(),
                                        child(ObservableProperty.THEN_STMT),
                                        conditional(ObservableProperty.ELSE_STMT, IS_PRESENT, newline()),
                                        unindent())),
                        conditional(
                                ObservableProperty.ELSE_STMT,
                                IS_PRESENT,
                                sequence(
                                        token(GeneratedJavaParserConstants.ELSE),
                                        conditional(
                                                Arrays.asList(
                                                        ObservableProperty.ELSE_BLOCK,
                                                        ObservableProperty.CASCADING_IF_STMT),
                                                CsmConditional.Condition.FLAG,
                                                sequence(space(), child(ObservableProperty.ELSE_STMT)),
                                                sequence(
                                                        newline(),
                                                        indent(),
                                                        child(ObservableProperty.ELSE_STMT),
                                                        unindent()))))));
        concreteSyntaxModelByClass.put(
                LabeledStmt.class,
                sequence(
                        comment(),
                        child(ObservableProperty.LABEL),
                        token(GeneratedJavaParserConstants.COLON),
                        space(),
                        child(ObservableProperty.STATEMENT)));
        concreteSyntaxModelByClass.put(
                LocalClassDeclarationStmt.class, sequence(comment(), child(ObservableProperty.CLASS_DECLARATION)));
        concreteSyntaxModelByClass.put(
                LocalRecordDeclarationStmt.class, sequence(comment(), child(ObservableProperty.RECORD_DECLARATION)));
        concreteSyntaxModelByClass.put(
                ReturnStmt.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.RETURN),
                        conditional(
                                ObservableProperty.EXPRESSION,
                                IS_PRESENT,
                                sequence(space(), child(ObservableProperty.EXPRESSION))),
                        semicolon()));
        concreteSyntaxModelByClass.put(
                YieldStmt.class,
                sequence(
                        comment(),
                        token(YIELD),
                        conditional(
                                ObservableProperty.EXPRESSION,
                                IS_PRESENT,
                                sequence(space(), child(ObservableProperty.EXPRESSION))),
                        semicolon()));
        concreteSyntaxModelByClass.put(
                SwitchEntry.class,
                sequence(
                        comment(),
                        conditional(
                                SWITCH_STATEMENT_ENTRY,
                                FLAG,
                                conditional(
                                        ObservableProperty.LABELS,
                                        IS_NOT_EMPTY,
                                        sequence(
                                                token(GeneratedJavaParserConstants.CASE),
                                                space(),
                                                list(ObservableProperty.LABELS),
                                                token(GeneratedJavaParserConstants.COLON)),
                                        sequence(
                                                token(GeneratedJavaParserConstants._DEFAULT),
                                                token(GeneratedJavaParserConstants.COLON))),
                                conditional(
                                        ObservableProperty.LABELS,
                                        IS_NOT_EMPTY,
                                        conditional(
                                                ObservableProperty.DEFAULT,
                                                FLAG,
                                                sequence(
                                                        token(GeneratedJavaParserConstants.CASE),
                                                        space(),
                                                        list(ObservableProperty.LABELS),
                                                        comma(),
                                                        space(),
                                                        token(GeneratedJavaParserConstants._DEFAULT),
                                                        space(),
                                                        token(GeneratedJavaParserConstants.ARROW)),
                                                sequence(
                                                        token(GeneratedJavaParserConstants.CASE),
                                                        space(),
                                                        list(ObservableProperty.LABELS),
                                                        conditional(
                                                                ObservableProperty.GUARD,
                                                                IS_PRESENT,
                                                                sequence(
                                                                        space(),
                                                                        token(GeneratedJavaParserConstants.WHEN),
                                                                        space(),
                                                                        child(ObservableProperty.GUARD))),
                                                        space(),
                                                        token(GeneratedJavaParserConstants.ARROW))),
                                        sequence(
                                                token(GeneratedJavaParserConstants._DEFAULT),
                                                space(),
                                                token(GeneratedJavaParserConstants.ARROW)))),
                        newline(),
                        indent(),
                        list(ObservableProperty.STATEMENTS, newline(), none(), newline()),
                        unindent()));
        concreteSyntaxModelByClass.put(
                SwitchStmt.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.SWITCH),
                        token(GeneratedJavaParserConstants.LPAREN),
                        child(ObservableProperty.SELECTOR),
                        token(GeneratedJavaParserConstants.RPAREN),
                        space(),
                        token(GeneratedJavaParserConstants.LBRACE),
                        newline(),
                        list(ObservableProperty.ENTRIES, none(), indent(), unindent()),
                        token(GeneratedJavaParserConstants.RBRACE)));
        concreteSyntaxModelByClass.put(
                SwitchExpr.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.SWITCH),
                        token(GeneratedJavaParserConstants.LPAREN),
                        child(ObservableProperty.SELECTOR),
                        token(GeneratedJavaParserConstants.RPAREN),
                        space(),
                        token(GeneratedJavaParserConstants.LBRACE),
                        newline(),
                        list(ObservableProperty.ENTRIES, none(), indent(), unindent()),
                        token(GeneratedJavaParserConstants.RBRACE)));
        concreteSyntaxModelByClass.put(
                SynchronizedStmt.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.SYNCHRONIZED),
                        space(),
                        token(LPAREN),
                        child(EXPRESSION),
                        token(RPAREN),
                        space(),
                        child(BODY)));
        concreteSyntaxModelByClass.put(
                ThrowStmt.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.THROW),
                        space(),
                        child(ObservableProperty.EXPRESSION),
                        semicolon()));
        concreteSyntaxModelByClass.put(
                TryStmt.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.TRY),
                        space(),
                        conditional(
                                ObservableProperty.RESOURCES,
                                CsmConditional.Condition.IS_NOT_EMPTY,
                                sequence(
                                        token(LPAREN),
                                        list(
                                                ObservableProperty.RESOURCES,
                                                sequence(semicolon(), newline()),
                                                indent(),
                                                unindent()),
                                        token(RPAREN),
                                        space())),
                        child(ObservableProperty.TRY_BLOCK),
                        list(ObservableProperty.CATCH_CLAUSES),
                        conditional(
                                ObservableProperty.FINALLY_BLOCK,
                                IS_PRESENT,
                                sequence(
                                        space(),
                                        token(GeneratedJavaParserConstants.FINALLY),
                                        space(),
                                        child(ObservableProperty.FINALLY_BLOCK)))));
        concreteSyntaxModelByClass.put(
                WhileStmt.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.WHILE),
                        space(),
                        token(GeneratedJavaParserConstants.LPAREN),
                        child(ObservableProperty.CONDITION),
                        token(GeneratedJavaParserConstants.RPAREN),
                        space(),
                        child(ObservableProperty.BODY)));
        // /
        // / Types
        // /
        concreteSyntaxModelByClass.put(
                ArrayType.class,
                sequence(
                        child(ObservableProperty.COMPONENT_TYPE),
                        list(ObservableProperty.ANNOTATIONS),
                        string(GeneratedJavaParserConstants.LBRACKET),
                        string(GeneratedJavaParserConstants.RBRACKET)));
        concreteSyntaxModelByClass.put(
                ClassOrInterfaceType.class,
                sequence(
                        comment(),
                        conditional(
                                SCOPE, IS_PRESENT, sequence(child(SCOPE), string(GeneratedJavaParserConstants.DOT))),
                        list(ANNOTATIONS, space(), none(), space()),
                        child(NAME),
                        conditional(
                                ObservableProperty.USING_DIAMOND_OPERATOR,
                                FLAG,
                                sequence(
                                        string(GeneratedJavaParserConstants.LT),
                                        string(GeneratedJavaParserConstants.GT)),
                                typeArguments())));
        concreteSyntaxModelByClass.put(
                IntersectionType.class,
                sequence(
                        comment(),
                        annotations(),
                        list(
                                ObservableProperty.ELEMENTS,
                                sequence(space(), token(GeneratedJavaParserConstants.BIT_AND), space()))));
        concreteSyntaxModelByClass.put(
                PrimitiveType.class,
                sequence(comment(), list(ObservableProperty.ANNOTATIONS), attribute(ObservableProperty.TYPE)));
        concreteSyntaxModelByClass.put(
                TypeParameter.class,
                sequence(
                        comment(),
                        annotations(),
                        child(ObservableProperty.NAME),
                        list(
                                ObservableProperty.TYPE_BOUND,
                                sequence(space(), token(GeneratedJavaParserConstants.BIT_AND), space()),
                                sequence(space(), token(GeneratedJavaParserConstants.EXTENDS), space()),
                                none())));
        concreteSyntaxModelByClass.put(
                UnionType.class,
                sequence(
                        comment(),
                        annotations(),
                        list(
                                ObservableProperty.ELEMENTS,
                                sequence(space(), token(GeneratedJavaParserConstants.BIT_OR), space()))));
        concreteSyntaxModelByClass.put(UnknownType.class, none());
        concreteSyntaxModelByClass.put(
                VoidType.class, sequence(comment(), annotations(), token(GeneratedJavaParserConstants.VOID)));
        concreteSyntaxModelByClass.put(
                VarType.class,
                sequence(comment(), annotations(), string(GeneratedJavaParserConstants.IDENTIFIER, "var")));
        concreteSyntaxModelByClass.put(
                WildcardType.class,
                sequence(
                        comment(),
                        annotations(),
                        token(GeneratedJavaParserConstants.HOOK),
                        conditional(
                                ObservableProperty.EXTENDED_TYPE,
                                IS_PRESENT,
                                sequence(
                                        space(),
                                        token(GeneratedJavaParserConstants.EXTENDS),
                                        space(),
                                        child(EXTENDED_TYPE))),
                        conditional(
                                ObservableProperty.SUPER_TYPE,
                                IS_PRESENT,
                                sequence(
                                        space(),
                                        token(GeneratedJavaParserConstants.SUPER),
                                        space(),
                                        child(SUPER_TYPE)))));
        // /
        // / Top Level
        // /
        concreteSyntaxModelByClass.put(
                ArrayCreationLevel.class,
                sequence(
                        annotations(),
                        token(GeneratedJavaParserConstants.LBRACKET),
                        child(ObservableProperty.DIMENSION),
                        token(GeneratedJavaParserConstants.RBRACKET)));
        concreteSyntaxModelByClass.put(
                CompilationUnit.class,
                sequence(
                        comment(),
                        child(ObservableProperty.PACKAGE_DECLARATION),
                        list(ObservableProperty.IMPORTS, newline(), none(), sequence(newline(), newline())),
                        list(TYPES, newline(), newline(), none(), newline()),
                        child(ObservableProperty.MODULE),
                        orphanCommentsEnding()));
        concreteSyntaxModelByClass.put(
                ImportDeclaration.class,
                sequence(
                        comment(),
                        token(GeneratedJavaParserConstants.IMPORT),
                        space(),
                        conditional(
                                ObservableProperty.STATIC,
                                FLAG,
                                sequence(token(GeneratedJavaParserConstants.STATIC), space())),
                        child(ObservableProperty.NAME),
                        conditional(
                                ASTERISK,
                                FLAG,
                                sequence(
                                        token(GeneratedJavaParserConstants.DOT),
                                        token(GeneratedJavaParserConstants.STAR))),
                        semicolon(),
                        orphanCommentsEnding()));
        concreteSyntaxModelByClass.put(
                PackageDeclaration.class,
                sequence(
                        comment(),
                        memberAnnotations(),
                        token(GeneratedJavaParserConstants.PACKAGE),
                        space(),
                        child(ObservableProperty.NAME),
                        semicolon(),
                        newline(),
                        newline(),
                        orphanCommentsEnding()));
        // /
        // / Module info
        // /
        concreteSyntaxModelByClass.put(
                ModuleDeclaration.class,
                sequence(
                        memberAnnotations(),
                        conditional(
                                ObservableProperty.OPEN,
                                FLAG,
                                sequence(token(GeneratedJavaParserConstants.OPEN), space())),
                        token(GeneratedJavaParserConstants.MODULE),
                        space(),
                        child(ObservableProperty.NAME),
                        space(),
                        token(GeneratedJavaParserConstants.LBRACE),
                        newline(),
                        indent(),
                        list(ObservableProperty.DIRECTIVES),
                        unindent(),
                        token(GeneratedJavaParserConstants.RBRACE),
                        newline()));
        concreteSyntaxModelByClass.put(
                ModuleExportsDirective.class,
                sequence(
                        token(GeneratedJavaParserConstants.EXPORTS),
                        space(),
                        child(ObservableProperty.NAME),
                        list(
                                ObservableProperty.MODULE_NAMES,
                                sequence(comma(), space()),
                                sequence(space(), token(GeneratedJavaParserConstants.TO), space()),
                                none()),
                        semicolon(),
                        newline()));
        concreteSyntaxModelByClass.put(
                ModuleOpensDirective.class,
                sequence(
                        token(GeneratedJavaParserConstants.OPENS),
                        space(),
                        child(ObservableProperty.NAME),
                        list(
                                ObservableProperty.MODULE_NAMES,
                                sequence(comma(), space()),
                                sequence(space(), token(GeneratedJavaParserConstants.TO), space()),
                                none()),
                        semicolon(),
                        newline()));
        concreteSyntaxModelByClass.put(
                ModuleProvidesDirective.class,
                sequence(
                        token(GeneratedJavaParserConstants.PROVIDES),
                        space(),
                        child(ObservableProperty.NAME),
                        list(
                                ObservableProperty.WITH,
                                sequence(comma(), space()),
                                sequence(space(), token(GeneratedJavaParserConstants.WITH), space()),
                                none()),
                        semicolon(),
                        newline()));
        concreteSyntaxModelByClass.put(
                ModuleRequiresDirective.class,
                sequence(
                        token(GeneratedJavaParserConstants.REQUIRES),
                        space(),
                        modifiers(),
                        child(ObservableProperty.NAME),
                        semicolon(),
                        newline()));
        concreteSyntaxModelByClass.put(
                ModuleUsesDirective.class,
                sequence(
                        token(GeneratedJavaParserConstants.USES),
                        space(),
                        child(ObservableProperty.NAME),
                        semicolon(),
                        newline()));
        List<String> unsupportedNodeClassNames = JavaParserMetaModel.getNodeMetaModels().stream()
                .filter(c -> !c.isAbstract()
                        && !Comment.class.isAssignableFrom(c.getType())
                        && !concreteSyntaxModelByClass.containsKey(c.getType()))
                .map(nm -> nm.getType().getSimpleName())
                .collect(Collectors.toList());
        if (unsupportedNodeClassNames.isEmpty()) {
            initializationError = Optional.empty();
        } else {
            initializationError = Optional.of("The " + ConcreteSyntaxModel.class.getSimpleName()
                    + " should include support for these classes: " + String.join(", ", unsupportedNodeClassNames));
        }
    }

    private ConcreteSyntaxModel() {}

    public static void genericPrettyPrint(Node node, SourcePrinter printer) {
        forClass(node.getClass()).prettyPrint(node, printer);
    }

    public static String genericPrettyPrint(Node node) {
        SourcePrinter sourcePrinter = new SourcePrinter();
        forClass(node.getClass()).prettyPrint(node, sourcePrinter);
        return sourcePrinter.toString();
    }

    public static CsmElement forClass(Class<? extends Node> nodeClazz) {
        initializationError.ifPresent(s -> {
            throw new IllegalStateException(s);
        });
        if (!concreteSyntaxModelByClass.containsKey(nodeClazz)) {
            throw new UnsupportedOperationException("Class " + nodeClazz.getSimpleName() + " not found!");
        }
        return concreteSyntaxModelByClass.get(nodeClazz);
    }
}
