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Language Server Protocol implementation for 1C (BSL) - 1C:Enterprise 8 and OneScript languages.
/*
* This file is a part of BSL Language Server.
*
* Copyright (c) 2018-2022
* Alexey Sosnoviy , Nikita Fedkin and contributors
*
* SPDX-License-Identifier: LGPL-3.0-or-later
*
* BSL Language Server is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3.0 of the License, or (at your option) any later version.
*
* BSL Language Server 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.
*
* You should have received a copy of the GNU Lesser General Public
* License along with BSL Language Server.
*/
package com.github._1c_syntax.bsl.languageserver.diagnostics;
import com.github._1c_syntax.bsl.languageserver.context.symbol.MethodSymbol;
import com.github._1c_syntax.bsl.languageserver.context.symbol.ParameterDefinition;
import com.github._1c_syntax.bsl.languageserver.context.symbol.VariableSymbol;
import com.github._1c_syntax.bsl.languageserver.diagnostics.metadata.DiagnosticMetadata;
import com.github._1c_syntax.bsl.languageserver.diagnostics.metadata.DiagnosticSeverity;
import com.github._1c_syntax.bsl.languageserver.diagnostics.metadata.DiagnosticTag;
import com.github._1c_syntax.bsl.languageserver.diagnostics.metadata.DiagnosticType;
import com.github._1c_syntax.bsl.languageserver.references.ReferenceIndex;
import com.github._1c_syntax.bsl.languageserver.references.model.OccurrenceType;
import com.github._1c_syntax.bsl.languageserver.references.model.Reference;
import com.github._1c_syntax.bsl.languageserver.utils.RelatedInformation;
import com.github._1c_syntax.bsl.languageserver.utils.Trees;
import com.github._1c_syntax.bsl.parser.BSLParser;
import lombok.RequiredArgsConstructor;
import org.antlr.v4.runtime.tree.RuleNode;
import org.antlr.v4.runtime.tree.TerminalNode;
import org.apache.commons.lang3.tuple.Pair;
import org.apache.commons.lang3.tuple.Triple;
import org.eclipse.lsp4j.DiagnosticRelatedInformation;
import org.eclipse.lsp4j.Position;
import org.eclipse.lsp4j.Range;
import org.eclipse.lsp4j.SymbolKind;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
import java.util.stream.Stream;
@DiagnosticMetadata(
type = DiagnosticType.CODE_SMELL,
severity = DiagnosticSeverity.MAJOR,
minutesToFix = 2,
tags = {
DiagnosticTag.SUSPICIOUS
}
)
@RequiredArgsConstructor
public class RewriteMethodParameterDiagnostic extends AbstractDiagnostic {
private static final int COUNT_OF_PAIR_FOR_SELF_ASSIGN = 2;
private final ReferenceIndex referenceIndex;
@Override
public void check() {
documentContext.getSymbolTree().getMethods().stream()
.flatMap(RewriteMethodParameterDiagnostic::getParametersByValue)
.flatMap(pair -> getVariableByParameter(pair.getLeft(), pair.getRight()))
.map(this::isOverwrited)
.filter(Optional::isPresent)
.map(Optional::get)
.forEach(variableSymbolReferenceListTriple -> fireIssue(variableSymbolReferenceListTriple.getLeft(),
variableSymbolReferenceListTriple.getMiddle(),
variableSymbolReferenceListTriple.getRight()));
}
private static Stream> getParametersByValue(MethodSymbol methodSymbol) {
return methodSymbol.getParameters().stream()
.filter(ParameterDefinition::isByValue)
.map(parameterDefinition -> Pair.of(methodSymbol, parameterDefinition));
}
private static Stream getVariableByParameter(MethodSymbol method, ParameterDefinition parameterDefinition) {
return method.getChildren().stream()
// в будущем могут появиться и другие символы, подчиненные методам
.filter(sourceDefinedSymbol -> sourceDefinedSymbol.getSymbolKind() == SymbolKind.Variable)
.filter(variable -> parameterDefinition.getRange().getStart().equals(variable.getSelectionRange().getStart()))
.filter(VariableSymbol.class::isInstance)
.map(VariableSymbol.class::cast)
.findFirst().stream();
}
private Optional>> isOverwrited(VariableSymbol variable) {
final var references = getSortedReferencesByLocation(variable);
return isOverwrited(references)
.map(defReference -> Triple.of(variable, defReference, references));
}
private List getSortedReferencesByLocation(VariableSymbol variable) {
final var references = referenceIndex.getReferencesTo(variable);
return references.stream()
.sorted((o1, o2) -> compare(o1.getSelectionRange(), o2.getSelectionRange()))
.collect(Collectors.toList());
}
private static int compare(Range o1, Range o2) {
return compare(o1.getStart(), o2.getStart());
}
public static int compare(Position pos1, Position pos2) {
// 1,1 10,10
if (pos1.getLine() < pos2.getLine()) {
return -1;
}
// 10,10 1,1
if (pos1.getLine() > pos2.getLine()) {
return 1;
}
// 1,4 1,9
return Integer.compare(pos1.getCharacter(), pos2.getCharacter());
// 1,9 1,4
}
private Optional isOverwrited(List references) {
if (!references.isEmpty()) {
final var firstDefIntoAssign = references.get(0);
if (firstDefIntoAssign.getOccurrenceType() == OccurrenceType.DEFINITION) {
if (references.size() == 1) {
return Optional.of(firstDefIntoAssign);
}
var refContextInsideDefAssign = getRefContextInsideDefAssign(firstDefIntoAssign, references.get(1));
if (refContextInsideDefAssign.isEmpty()) {
return Optional.of(firstDefIntoAssign);
}
var isSelfAssign = Boolean.TRUE.equals(refContextInsideDefAssign
.map(RewriteMethodParameterDiagnostic::isVarNameOnlyIntoExpression)
.orElseThrow());
if (isSelfAssign && references.size() > COUNT_OF_PAIR_FOR_SELF_ASSIGN) {
return isOverwrited(references.subList(COUNT_OF_PAIR_FOR_SELF_ASSIGN, references.size()));
}
}
}
return Optional.empty();
}
private Optional getRefContextInsideDefAssign(Reference defRef, Reference nextRef) {
final var defNode = Trees.findTerminalNodeContainsPosition(documentContext.getAst(),
defRef.getSelectionRange().getStart());
final var assignment = defNode
.map(TerminalNode::getParent)
.filter(BSLParser.LValueContext.class::isInstance)
.map(RuleNode::getParent)
.filter(BSLParser.AssignmentContext.class::isInstance)
.map(BSLParser.AssignmentContext.class::cast);
return assignment.flatMap(assignContext ->
Trees.findTerminalNodeContainsPosition(assignContext, nextRef.getSelectionRange().getStart()))
.map(TerminalNode::getParent);
}
private static boolean isVarNameOnlyIntoExpression(RuleNode refContext) {
return Optional.of(refContext)
.filter(BSLParser.ComplexIdentifierContext.class::isInstance)
.map(BSLParser.ComplexIdentifierContext.class::cast)
.filter(node -> node.getChildCount() == 1)
.map(RuleNode::getParent)
.filter(BSLParser.MemberContext.class::isInstance)
.map(RuleNode::getParent)
.filter(expression -> expression.getChildCount() == 1)
.filter(BSLParser.ExpressionContext.class::isInstance)
.isPresent();
}
private void fireIssue(VariableSymbol variable, Reference nodeForIssue, List references) {
var refsForIssue = references.stream()
.map(reference -> RelatedInformation.create(
documentContext.getUri(),
reference.getSelectionRange(),
"+1"
)).collect(Collectors.toList());
var resultRefs = new ArrayList();
resultRefs.add(RelatedInformation.create(
documentContext.getUri(),
variable.getVariableNameRange(),
"0"));
resultRefs.addAll(refsForIssue);
diagnosticStorage.addDiagnostic(nodeForIssue.getSelectionRange(), info.getMessage(variable.getName()), resultRefs);
}
}