private WhenTranslator(
@NotNull KtWhenExpression expression, @NotNull TranslationContext context) {
super(context);
whenExpression = expression;
KtExpression subject = expression.getSubjectExpression();
if (subject != null) {
JsExpression subjectExpression = Translation.translateAsExpression(subject, context);
if (TranslationUtils.isCacheNeeded(subjectExpression)) {
TemporaryVariable subjectVar = context.declareTemporary(null);
context.addStatementToCurrentBlock(
JsAstUtils.assignment(subjectVar.reference(), subjectExpression).makeStmt());
subjectExpression = subjectVar.reference();
}
expressionToMatch = subjectExpression;
} else {
expressionToMatch = null;
}
}
private JsStatement translate() {
if (expressionToMatch != null && JsAstUtils.isEmptyExpression(expressionToMatch)) {
return JsEmpty.INSTANCE;
}
JsIf currentIf = null;
JsIf resultIf = null;
for (KtWhenEntry entry : whenExpression.getEntries()) {
JsBlock statementBlock = new JsBlock();
JsStatement statement = translateEntryExpression(entry, context(), statementBlock);
if (resultIf == null && entry.isElse()) {
context().addStatementsToCurrentBlockFrom(statementBlock);
return statement;
}
statement = JsAstUtils.mergeStatementInBlockIfNeeded(statement, statementBlock);
if (resultIf == null) {
currentIf = JsAstUtils.newJsIf(translateConditions(entry, context()), statement);
resultIf = currentIf;
} else {
if (entry.isElse()) {
currentIf.setElseStatement(statement);
return resultIf;
}
JsBlock conditionsBlock = new JsBlock();
JsIf nextIf =
JsAstUtils.newJsIf(
translateConditions(entry, context().innerBlock(conditionsBlock)), statement);
JsStatement statementToAdd =
JsAstUtils.mergeStatementInBlockIfNeeded(nextIf, conditionsBlock);
currentIf.setElseStatement(statementToAdd);
currentIf = nextIf;
}
}
return resultIf;
}