| 1 | /* |
|---|---|
| 2 | * Copyright (C) 2007-2010 Júlio Vilmar Gesser. |
| 3 | * Copyright (C) 2011, 2013-2020 The JavaParser Team. |
| 4 | * |
| 5 | * This file is part of JavaParser. |
| 6 | * |
| 7 | * JavaParser can be used either under the terms of |
| 8 | * a) the GNU Lesser General Public License as published by |
| 9 | * the Free Software Foundation, either version 3 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * b) the terms of the Apache License |
| 12 | * |
| 13 | * You should have received a copy of both licenses in LICENCE.LGPL and |
| 14 | * LICENCE.APACHE. Please refer to those files for details. |
| 15 | * |
| 16 | * JavaParser is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU Lesser General Public License for more details. |
| 20 | */ |
| 21 | |
| 22 | package com.github.javaparser.ast.validator.chunks; |
| 23 | |
| 24 | import com.github.javaparser.ast.Node; |
| 25 | import com.github.javaparser.ast.body.Parameter; |
| 26 | import com.github.javaparser.ast.body.VariableDeclarator; |
| 27 | import com.github.javaparser.ast.expr.ArrayInitializerExpr; |
| 28 | import com.github.javaparser.ast.expr.LambdaExpr; |
| 29 | import com.github.javaparser.ast.expr.NullLiteralExpr; |
| 30 | import com.github.javaparser.ast.expr.VariableDeclarationExpr; |
| 31 | import com.github.javaparser.ast.stmt.ExpressionStmt; |
| 32 | import com.github.javaparser.ast.stmt.ForStmt; |
| 33 | import com.github.javaparser.ast.stmt.ForEachStmt; |
| 34 | import com.github.javaparser.ast.stmt.TryStmt; |
| 35 | import com.github.javaparser.ast.type.VarType; |
| 36 | import com.github.javaparser.ast.validator.ProblemReporter; |
| 37 | import com.github.javaparser.ast.validator.TypedValidator; |
| 38 | |
| 39 | import java.util.Optional; |
| 40 | |
| 41 | public class VarValidator implements TypedValidator<VarType> { |
| 42 | private boolean varAllowedInLambdaParameters; |
| 43 | |
| 44 | public VarValidator(boolean varAllowedInLambdaParameters) { |
| 45 | this.varAllowedInLambdaParameters = varAllowedInLambdaParameters; |
| 46 | } |
| 47 | |
| 48 | @Override |
| 49 | public void accept(VarType node, ProblemReporter reporter) { |
| 50 | // All allowed locations are within a VariableDeclaration inside a VariableDeclarationExpr inside something else. |
| 51 | Optional<VariableDeclarator> variableDeclarator = node.findAncestor(VariableDeclarator.class); |
| 52 | if (!variableDeclarator.isPresent()) { |
| 53 | // Java 11's var in lambda's |
| 54 | if (varAllowedInLambdaParameters) { |
| 55 | boolean valid = node |
| 56 | .findAncestor(Parameter.class) |
| 57 | .flatMap(Node::getParentNode) |
| 58 | .map((Node p) -> p instanceof LambdaExpr).orElse(false); |
| 59 | if (valid) { |
| 60 | return; |
| 61 | } |
| 62 | } |
| 63 | reportIllegalPosition(node, reporter); |
| 64 | return; |
| 65 | } |
| 66 | variableDeclarator.ifPresent(vd -> { |
| 67 | if (vd.getType().isArrayType()) { |
| 68 | reporter.report(vd, "\"var\" cannot have extra array brackets."); |
| 69 | } |
| 70 | Optional<Node> variableDeclarationExpr = vd.getParentNode(); |
| 71 | if (!variableDeclarationExpr.isPresent()) { |
| 72 | reportIllegalPosition(node, reporter); |
| 73 | return; |
| 74 | } |
| 75 | variableDeclarationExpr.ifPresent(vdeNode -> { |
| 76 | if (!(vdeNode instanceof VariableDeclarationExpr)) { |
| 77 | reportIllegalPosition(node, reporter); |
| 78 | return; |
| 79 | } |
| 80 | VariableDeclarationExpr vde = (VariableDeclarationExpr) vdeNode; |
| 81 | if (vde.getVariables().size() > 1) { |
| 82 | reporter.report(vde, "\"var\" only takes a single variable."); |
| 83 | } |
| 84 | Optional<Node> container = vdeNode.getParentNode(); |
| 85 | if (!container.isPresent()) { |
| 86 | reportIllegalPosition(node, reporter); |
| 87 | return; |
| 88 | } |
| 89 | container.ifPresent(c -> { |
| 90 | boolean positionIsFine = c instanceof ForStmt || c instanceof ForEachStmt || |
| 91 | c instanceof ExpressionStmt || c instanceof TryStmt; |
| 92 | if (!positionIsFine) { |
| 93 | reportIllegalPosition(node, reporter); |
| 94 | } |
| 95 | // A local variable declaration ends up inside an ExpressionStmt. |
| 96 | if (c instanceof ExpressionStmt) { |
| 97 | if (!vd.getInitializer().isPresent()) { |
| 98 | reporter.report(node, "\"var\" needs an initializer."); |
| 99 | } |
| 100 | vd.getInitializer().ifPresent(initializer -> { |
| 101 | if (initializer instanceof NullLiteralExpr) { |
| 102 | reporter.report(node, "\"var\" cannot infer type from just null."); |
| 103 | } |
| 104 | if (initializer instanceof ArrayInitializerExpr) { |
| 105 | reporter.report(node, "\"var\" cannot infer array types."); |
| 106 | } |
| 107 | }); |
| 108 | |
| 109 | } |
| 110 | }); |
| 111 | }); |
| 112 | }); |
| 113 | |
| 114 | } |
| 115 | |
| 116 | private void reportIllegalPosition(VarType n, ProblemReporter reporter) { |
| 117 | reporter.report(n, "\"var\" is not allowed here."); |
| 118 | } |
| 119 | } |
| 120 |
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