internal EvaluationContext(
ITraceWriter trace,
ISecretMasker secretMasker,
Object state,
EvaluationOptions options,
ExpressionNode node)
{
ArgumentUtility.CheckForNull(trace, nameof(trace));
ArgumentUtility.CheckForNull(secretMasker, nameof(secretMasker));
Trace = trace;
SecretMasker = secretMasker;
State = state;
// Copy the options
options = new EvaluationOptions(copy: options);
if (options.MaxMemory == 0)
{
// Set a reasonable default max memory
options.MaxMemory = 1048576; // 1 mb
}
Options = options;
Memory = new EvaluationMemory(options.MaxMemory, node);
m_traceResults = new Dictionary <ExpressionNode, String>();
m_traceMemory = new MemoryCounter(null, options.MaxMemory);
}
/// <summary>
/// This function is intended only for ExpressionNode authors to call. The EvaluationContext
/// caches result-state specific to the evaluation instance.
/// </summary>
public EvaluationResult Evaluate(EvaluationContext context)
{
// Evaluate
Level = Container == null ? 0 : Container.Level + 1;
TraceVerbose(context, Level, $"Evaluating {Name}:");
var coreResult = EvaluateCore(context, out ResultMemory coreMemory);
if (coreMemory == null)
{
coreMemory = new ResultMemory();
}
// Convert to canonical value
var val = ExpressionUtility.ConvertToCanonicalValue(coreResult, out ValueKind kind, out Object raw);
// The depth can be safely trimmed when the total size of the core result is known,
// or when the total size of the core result can easily be determined.
var trimDepth = coreMemory.IsTotal || (Object.ReferenceEquals(raw, null) && ExpressionUtility.IsPrimitive(kind));
// Account for the memory overhead of the core result
var coreBytes = coreMemory.Bytes ?? EvaluationMemory.CalculateBytes(raw ?? val);
context.Memory.AddAmount(Level, coreBytes, trimDepth);
// Account for the memory overhead of the conversion result
if (!Object.ReferenceEquals(raw, null))
{
var conversionBytes = EvaluationMemory.CalculateBytes(val);
context.Memory.AddAmount(Level, conversionBytes);
}
var result = new EvaluationResult(context, Level, val, kind, raw);
// Store the trace result
if (this.TraceFullyRealized)
{
context.SetTraceResult(this, result);
}
return(result);
}