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// Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
import 'package:analysis_server/src/services/correction/assist.dart';
import 'package:analysis_server/src/services/correction/dart/abstract_producer.dart';
import 'package:analysis_server/src/services/correction/util.dart';
import 'package:analyzer/dart/ast/ast.dart';
import 'package:analyzer_plugin/utilities/assist/assist.dart';
import 'package:analyzer_plugin/utilities/change_builder/change_builder_core.dart';
import 'package:analyzer_plugin/utilities/range_factory.dart';
class JoinIfWithInner extends CorrectionProducer {
@override
AssistKind get assistKind => DartAssistKind.JOIN_IF_WITH_INNER;
@override
Future<void> compute(ChangeBuilder builder) async {
// climb up condition to the (supposedly) "if" statement
var node = this.node;
while (node is Expression) {
node = node.parent;
}
// prepare target "if" statement
if (node is! IfStatement) {
return;
}
var targetIfStatement = node as IfStatement;
if (targetIfStatement.elseStatement != null) {
return;
}
// prepare inner "if" statement
var targetThenStatement = targetIfStatement.thenStatement;
var innerStatement = getSingleStatement(targetThenStatement);
if (innerStatement is! IfStatement) {
return;
}
var innerIfStatement = innerStatement as IfStatement;
if (innerIfStatement.elseStatement != null) {
return;
}
// prepare environment
var prefix = utils.getNodePrefix(targetIfStatement);
// merge conditions
var targetCondition = targetIfStatement.condition;
var innerCondition = innerIfStatement.condition;
var targetConditionSource = utils.getNodeText(targetCondition);
var innerConditionSource = utils.getNodeText(innerCondition);
if (shouldWrapParenthesisBeforeAnd(targetCondition)) {
targetConditionSource = '($targetConditionSource)';
}
if (shouldWrapParenthesisBeforeAnd(innerCondition)) {
innerConditionSource = '($innerConditionSource)';
}
var condition = '$targetConditionSource && $innerConditionSource';
// replace target "if" statement
var innerThenStatement = innerIfStatement.thenStatement;
var innerThenStatements = getStatements(innerThenStatement);
var lineRanges = utils.getLinesRangeStatements(innerThenStatements);
var oldSource = utils.getRangeText(lineRanges);
var newSource = utils.indentSourceLeftRight(oldSource);
await builder.addDartFileEdit(file, (builder) {
builder.addSimpleReplacement(range.node(targetIfStatement),
'if ($condition) {$eol$newSource$prefix}');
});
}
/// Return an instance of this class. Used as a tear-off in `AssistProcessor`.
static JoinIfWithInner newInstance() => JoinIfWithInner();
}