ASTNode ASSERT()
{
var node = new AssertNode();
node.lexeme = Consume("assert", TokenType.KEYWORD);
Consume("(", TokenType.SEPARATOR);
node.condition = EXPR();
Consume(")", TokenType.SEPARATOR);
return(node);
}
public void VisitAssert(AssertNode an)
{
int temp = this.depth;
string spaces = IncreaseDepth();
this.io.WriteLine($"{spaces}Assert: (");
an.Expression.Visit(this);
this.io.WriteLine($"{spaces})");
this.depth = temp;
}
public void VisitAssert(AssertNode an)
{
UnaryOperandNode node = an.Expression.Visit(this);
if (node.Type == SymbolType.Boolean && node.Value == "false")
{
UnaryOperandNode left = an.Expression.Left.Visit(this);
UnaryOperandNode right = an.Expression.Right.Visit(this);
string op;
string message = "Assert was false.";
if (right.Type != SymbolType.Invalid)
{
// BinaryExpression
op = an.Expression.Operator;
message = $"Assert was false. Received assert ({left.Value} {op} {right.Value})";
}
throw new Error(message, node.Token);
}
if (node.Type != SymbolType.Boolean)
{
throw new Error($"Expected Boolean value inside assert (Boolean). Instead found {node.Type}", node.Token);
}
}