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/*
* MIT License
*
* Copyright (c) 2022-2024 Volodya Lombrozo
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.github.lombrozo.testnames.javaparser;
import com.github.javaparser.ast.Node;
import com.github.javaparser.ast.body.MethodDeclaration;
import com.github.javaparser.ast.body.VariableDeclarator;
import com.github.javaparser.ast.expr.Expression;
import com.github.javaparser.ast.expr.MethodCallExpr;
import com.github.javaparser.ast.nodeTypes.NodeWithBody;
import com.github.javaparser.ast.stmt.BlockStmt;
import com.github.javaparser.ast.stmt.IfStmt;
import com.github.javaparser.ast.stmt.Statement;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Optional;
import java.util.stream.Stream;
import lombok.EqualsAndHashCode;
import lombok.ToString;
/**
* JavaParser method.
* Utility class for working with JavaParser library.
*
* @since 0.1.15
*/
@ToString
@EqualsAndHashCode
final class JavaParserMethod {
/**
* The method declaration.
*/
private final MethodDeclaration method;
/**
* Ctor.
* @param declaration Method declaration.
*/
JavaParserMethod(final MethodDeclaration declaration) {
this.method = declaration;
}
/**
* Get method name.
* @return Method name.
*/
String name() {
return this.method.getNameAsString();
}
/**
* Get method declaration.
* @return Method declaration.
*/
MethodDeclaration asMethodDeclaration() {
return this.method;
}
/**
* Get all method statements.
* @return Method statements.
*/
Stream statements() {
return JavaParserMethod.flatStatements(this.body().getStatements().stream())
.filter(Statement::isExpressionStmt)
.map(JavaParserMethod::toExpression)
.filter(Expression::isMethodCallExpr)
.map(MethodCallExpr.class::cast);
}
/**
* This method unrolls inner method statements.
* In other words, if a statement is a type of block that contains inner statements,
* we simply unroll all these statements and return them as a flat stream.
* @param stmts Statements to unroll.
* @return Stream of statements.
* @todo #357:90min Refactor 'flatStatements' method to make it more readable.
* The method 'flatStatements' is too complex and hard to read. It should be refactored
* to make it more readable and maintainable.
*/
@SuppressWarnings("PMD.CognitiveComplexity")
private static Stream flatStatements(final Stream stmts) {
return stmts.flatMap(
statement -> {
final Stream result;
if (statement instanceof NodeWithBody) {
result = JavaParserMethod.flatStatements(
((NodeWithBody) statement).getBody()
.asBlockStmt()
.getStatements()
.stream()
);
} else if (statement instanceof IfStmt) {
final IfStmt ifstmt = (IfStmt) statement;
final Collection statements = new ArrayList<>(3);
if (ifstmt.hasThenBlock()) {
statements.add(ifstmt.getThenStmt());
}
if (ifstmt.hasElseBlock()) {
statements.add(
ifstmt.getElseStmt()
.orElseThrow(
() -> new IllegalStateException(
"Else block is absent. It's impossible"
)
)
);
}
result = JavaParserMethod.flatStatements(statements.stream());
} else if (statement.isBlockStmt()) {
result = JavaParserMethod.flatStatements(
statement.asBlockStmt().getStatements().stream()
);
} else if (statement.isExpressionStmt()) {
final Expression expression = statement.asExpressionStmt().getExpression();
if (expression.isMethodCallExpr()) {
final MethodCallExpr call = expression.asMethodCallExpr();
result = Stream.concat(
Stream.concat(
call.getScope()
.map(JavaParserMethod::flatStatements)
.orElseGet(Stream::empty),
Stream.of(statement)
),
call.getArguments().stream().flatMap(JavaParserMethod::flatStatements)
);
} else {
result = JavaParserMethod.flatStatements(expression);
}
} else if (statement.isTryStmt()) {
final List statements = JavaParserMethod.statements(statement);
result = statements.stream();
} else {
result = Stream.of(statement);
}
return result;
}
);
}
/**
* Extract statements from node.
* @param node Node to extract statements from.
* @return List of statements.
*/
private static List statements(final Node node) {
final List res = new ArrayList<>(0);
if (node instanceof Statement) {
res.add((Statement) node);
}
node.getChildNodes()
.stream()
.map(JavaParserMethod::statements)
.forEach(res::addAll);
return res;
}
/**
* This method extracts statements from Expression.
* @param expression Expression to extract statements from.
* @return Stream of statements.
* @todo #357:90min Refactor 'flatStatements' method to make it more readable.
* The method 'flatStatements' is too complex and hard to read. It should be refactored
* to make it more readable and maintainable. The method should be split into smaller
* methods with clear responsibilities.
*/
@SuppressWarnings("PMD.CognitiveComplexity")
private static Stream flatStatements(final Expression expression) {
final Stream result;
if (expression.isLambdaExpr()) {
result = JavaParserMethod.flatStatements(
Stream.of(expression.asLambdaExpr().getBody())
);
} else if (expression.isMethodCallExpr()) {
final MethodCallExpr call = expression.asMethodCallExpr();
result = Stream.concat(
call.getScope().map(JavaParserMethod::flatStatements).orElseGet(Stream::empty),
call.getArguments().stream().flatMap(JavaParserMethod::flatStatements)
);
} else {
final List statements = new ArrayList<>(0);
final List declarators = new ArrayList<>(0);
final List expressions = new ArrayList<>(0);
for (final Node node : expression.getChildNodes()) {
if (node instanceof Statement) {
statements.add((Statement) node);
} else if (node instanceof VariableDeclarator) {
declarators.add((VariableDeclarator) node);
} else if (node instanceof Expression) {
expressions.add((Expression) node);
}
}
result = Stream.concat(
Stream.concat(
declarators.stream()
.map(VariableDeclarator::getInitializer)
.filter(Optional::isPresent)
.map(Optional::get)
.flatMap(JavaParserMethod::flatStatements),
expressions.stream().flatMap(JavaParserMethod::flatStatements)
),
statements.stream()
);
}
return result;
}
/**
* Get method body.
* @return Method body.
*/
private BlockStmt body() {
return this.method.getBody().orElseThrow(
() -> new IllegalStateException(
String.format(
"The method %s has to have body, otherwise it is not a method",
this.method.getNameAsString()
)
)
);
}
/**
* Convert statement to expression.
* @param statement Statement
* @return Expression
*/
private static Expression toExpression(final Statement statement) {
return statement.toExpressionStmt().orElseThrow(
() -> new IllegalStateException("Statement is not expression")
).getExpression();
}
}
