private void checkDefault(SwitchLabelContext label, Expression caseExpression, ref bool hasDefault)
{
if (caseExpression == null)
{
if (hasDefault)
{
log.error(
new DiagnosticPosition(label.start.Line, label.start.Column),
messages.multipleDefaults);
}
hasDefault = true;
}
}
private Switch makeSwitch(StatementContext stat)
{
Expression selector = (Expression)VisitExpression(stat.expression());
CaseGroupContext[] caseGroups = stat.caseGroup();
IList <SwitchLabelContext> bottomLabels = stat._bottomLabels;
int count = caseGroups.Select(x => x.labels._labels.Count).Sum();
Case[] cases = new Case[count + bottomLabels.Count];
int iCases = 0;
bool hasDefault = false;
foreach (CaseGroupContext caseGroup in caseGroups)
{
IList <SwitchLabelContext> labels = caseGroup.labels._labels;
int last = labels.Count - 1;
// for each label except last
for (var index = 0; index < last; index++)
{
SwitchLabelContext label = labels[index];
Expression caseExpression = getCaseExpression(label);
checkDefault(label, caseExpression, ref hasDefault);
cases[iCases++] = new Case(label.start.Line, label.start.Column, label.stop.Line,
label.stop.Column, caseExpression,
CollectionUtils.emptyList <StatementNode>());
}
SwitchLabelContext lastLabel = labels[last];
Expression lastCaseExpression = getCaseExpression(lastLabel);
checkDefault(lastLabel, lastCaseExpression, ref hasDefault);
IList <StatementNode> statements = convertBlockStatementList(caseGroup.stmts);
cases[iCases++] = new Case(lastLabel.start.Line, lastLabel.start.Column, caseGroup.stop.Line,
caseGroup.stop.Column, lastCaseExpression, statements);
}
foreach (SwitchLabelContext label in bottomLabels)
{
Expression caseExpression = getCaseExpression(label);
checkDefault(label, caseExpression, ref hasDefault);
cases[iCases++] = new Case(label.start.Line, label.start.Column, label.stop.Line,
label.stop.Column, caseExpression,
CollectionUtils.emptyList <StatementNode>());
}
return(new Switch(stat.start.Line, stat.start.Column, stat.stop.Line,
stat.stop.Column, selector, cases, hasDefault));
}
protected virtual bool VisitSwitchLabel(SwitchLabelContext ctx)
{
var expr = ctx.constantExpression();
if (expr != null)
{
var exprText = expr.GetText();
if (ResizingBehaviorEnum.Contains(exprText))
{
_rewriter.Replace(expr.Start, expr.Stop, $"ResizingBehavior.{exprText}");
}
}
return(true);
}
public override Tree VisitSwitchLabel(SwitchLabelContext context) => throw new InvalidOperationException();
private Expression getCaseExpression(SwitchLabelContext label)
{
ConstantExpressionContext constExp = label.constantExpression();
return(constExp == null ? null : (Expression)VisitLiteral(constExp.literal()));
}
