// возвращает ExpressionStatement
public override object VisitExpressionStatement([NotNull] DoshikParser.ExpressionStatementContext context)
{
_compilationContext.SetParsingAntlrContext(context);
var statement = new ExpressionStatement(_currentNode);
statement.Expression = ExpressionCreationVisitor.Apply(_compilationContext, statement, context.expression());
return(statement);
}
// Возвращает ExpressionTree
public override object VisitVariableInitializer([NotNull] DoshikParser.VariableInitializerContext context)
{
_compilationContext.SetParsingAntlrContext(context);
var expressionCtx = context.expression();
if (expressionCtx != null)
{
var expressionTree = ExpressionCreationVisitor.Apply(_compilationContext, _currentExpressionParent, expressionCtx);
if (_declaringVariable.Type != expressionTree.RootExpression.ReturnOutputSlot.Type)
{
throw _compilationContext.ThrowCompilationError("declaring variable type differs from initialization expression return type");
}
return(expressionTree);
}
else
{
throw _compilationContext.ThrowCompilationError("variables can only be initialized using expressions (no special initializer support yet)");
}
}
public override object VisitWhileLoopStatement([NotNull] DoshikParser.WhileLoopStatementContext context)
{
_compilationContext.SetParsingAntlrContext(context);
var statement = new WhileStatement(_currentNode);
_currentExpressionParent = statement;
statement.Condition = ExpressionCreationVisitor.Apply(_compilationContext, _currentExpressionParent, context.condition);
if (statement.Condition.RootExpression.ReturnOutputSlot.Type != _compilationContext.TypeLibrary.FindByKnownType(KnownType.Boolean))
{
throw _compilationContext.ThrowCompilationError("condition must evaluate to bool value");
}
_isInLoopCounter++;
statement.BodyStatement = (Statement)Visit(context.body);
_isInLoopCounter--;
return(statement);
}
// возвращает Statement (IfStatement)
public override object VisitIfStatement([NotNull] DoshikParser.IfStatementContext context)
{
_compilationContext.SetParsingAntlrContext(context);
var statement = new IfStatement(_currentNode);
_currentExpressionParent = statement;
statement.Condition = ExpressionCreationVisitor.Apply(_compilationContext, _currentExpressionParent, context.condition);
if (statement.Condition.RootExpression.ReturnOutputSlot.Type != _compilationContext.TypeLibrary.FindByKnownType(KnownType.Boolean))
{
throw _compilationContext.ThrowCompilationError("condition must evaluate to bool value");
}
statement.TrueStatement = (Statement)Visit(context.trueBody);
if (context.falseBody != null)
{
statement.FalseStatement = (Statement)Visit(context.falseBody);
}
return(statement);
}