public override object VisitExp([NotNull] SLangGrammarParser.ExpContext context)
{
Visit(context.simpleExpr());
if (context.exp() != null)
{
var op = context.BoolEq() ?? context.BoolG() ?? context.BoolGeq() ?? context.BoolL() ?? context.BoolLeq() ?? context.BoolNeq();
cppText.Write($" {op.GetText()} ");
Visit(context.exp());
}
return(null);
}
private void TranslateDeclare(VariableNameTableItem item, SLangGrammarParser.ExpContext expContext)
{
if (!inProgramBlock && currentRoutine == null)
{
TranslateDeclareHead(item, headerText);
}
TranslateDeclareHead(item, cppText);
if (expContext != null)
{
cppText.Write(" = ");
Visit(expContext);
}
}
public override object VisitExp([NotNull] SLangGrammarParser.ExpContext context)
{
// что можно сравнивать в языке?
// int и float и char и bool только между собой -- все простые типы кроме строк
// указатели любого типа только между собой
if (context.exp() != null)
{
var leftResultType = (Visit(context.simpleExpr()) as ExpressionResult)?.Type;
var rightResultType = (Visit(context.exp()) as ExpressionResult)?.Type;
var allowedTypes = new[] { SlangSimpleType.Int, SlangSimpleType.Real, SlangSimpleType.Boolean, SlangSimpleType.Character };
var relOp = context.BoolEq() ?? context.BoolNeq() ?? context.BoolG() ?? context.BoolGeq() ?? context.BoolL() ?? context.BoolLeq();
if ((leftResultType is SlangSimpleType lt && rightResultType is SlangSimpleType rt &&
lt.Equals(rt) && allowedTypes.Contains(lt)) ||
((leftResultType is SlangPointerType || leftResultType is SlangNullType) && (rightResultType is SlangPointerType || rightResultType is SlangNullType)))
{
return(new ExpressionResult(SlangSimpleType.Boolean, ExpressionValueType.Value));
}
ThrowInvalidTypesForBinaryOperationException(relOp.Symbol, file, leftResultType, rightResultType);
}
return(Visit(context.simpleExpr()) as ExpressionResult);
}
/// <summary>
/// Exit a parse tree produced by <see cref="SLangGrammarParser.exp"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitExp([NotNull] SLangGrammarParser.ExpContext context)
{
}
/// <summary>
/// Visit a parse tree produced by <see cref="SLangGrammarParser.exp"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitExp([NotNull] SLangGrammarParser.ExpContext context)
{
return(VisitChildren(context));
}