/// <summary>
/// Creates a new set of metadata.
/// </summary>
/// <param name="executionState">The current execution state.</param>
/// <param name="items">The initial set of items. If null, no underlying dictionary will be created.</param>
public Metadata(IExecutionState executionState, IEnumerable <KeyValuePair <string, object> > items = null)
{
_ = executionState ?? throw new ArgumentNullException(nameof(executionState));
if (items != null)
{
Dictionary = new Dictionary <string, object>(StringComparer.OrdinalIgnoreCase);
// If items is an IMetadata, use the raw enumerable so that we don't expand IMetadataValue and Config values
if (items is IMetadata metadata)
{
items = metadata.GetRawEnumerable();
}
// Iterate the items, checking for script values
foreach (KeyValuePair <string, object> item in items)
{
if (ScriptMetadataValue.TryGetScriptMetadataValue(item.Key, item.Value, executionState, out ScriptMetadataValue metadataValue))
{
Dictionary[item.Key] = metadataValue;
}
else
{
Dictionary[item.Key] = item.Value;
}
}
}
}
public static bool TryGetScriptMetadataValue(string key, object value, IExecutionState executionState, out ScriptMetadataValue scriptMetadataValue)
{
scriptMetadataValue = default;
if (value is string stringValue && IScriptHelper.TryGetScriptString(stringValue, out string script))
{
scriptMetadataValue = new ScriptMetadataValue(
key,
stringValue.Substring(0, stringValue.Length - script.Length),
script,
executionState);
return(true);
}
return(false);
}
public static bool TryGetScriptMetadataValue(string key, object value, IExecutionState executionState, out ScriptMetadataValue scriptMetadataValue)
{
scriptMetadataValue = default;
if (value is string script)
{
script = script.TrimStart();
if (script.StartsWith("=>"))
{
script = script.Substring(2);
if (!string.IsNullOrWhiteSpace(script))
{
scriptMetadataValue = new ScriptMetadataValue(
key,
((string)value).Substring(0, ((string)value).Length - script.Length),
script,
executionState);
return(true);
}
}
}
return(false);
}
