/// <summary>Get the text representation of a token's values.</summary>
/// <param name="context">Provides access to contextual tokens.</param>
/// <param name="part">The token string part whose value to fetch.</param>
/// <param name="unavailableTokens">A list of unavailable or unready token names to update if needed.</param>
/// <param name="errors">The errors which occurred (if any).</param>
/// <param name="text">The text representation, if available.</param>
/// <returns>Returns true if the token is ready and <paramref name="text"/> was set, else false.</returns>
private bool TryGetTokenText(IContext context, TokenStringPart part, InvariantHashSet unavailableTokens, InvariantHashSet errors, out string text)
{
switch (part.LexToken)
{
case LexTokenToken lexToken:
{
// get token
IToken token = context.GetToken(lexToken.Name, enforceContext: true);
if (token == null || !token.IsReady)
{
unavailableTokens.Add(lexToken.Name);
text = null;
return(false);
}
// get token input
if (part.Input != null)
{
// update input
part.Input.UpdateContext(context);
// check for unavailable tokens
string[] unavailableInputTokens = part.Input
.GetTokensUsed()
.Where(name => context.GetToken(name, enforceContext: true)?.IsReady != true)
.ToArray();
if (unavailableInputTokens.Any())
{
foreach (string tokenName in unavailableInputTokens)
{
unavailableTokens.Add(tokenName);
}
text = null;
return(false);
}
}
// validate input
if (!token.TryValidateInput(part.InputArgs, out string error))
{
errors.Add(error);
text = null;
return(false);
}
// get text representation
string[] values = token.GetValues(part.InputArgs).ToArray();
text = string.Join(", ", values);
return(true);
}
default:
text = part.LexToken.ToString();
return(true);
}
}
/// <summary>Get the text representation of a token's values.</summary>
/// <param name="context">Provides access to contextual tokens.</param>
/// <param name="part">The token string part whose value to fetch.</param>
/// <param name="state">The context state to update with errors, unavailable tokens, etc.</param>
/// <param name="text">The text representation, if available.</param>
/// <returns>Returns true if the token is ready and <paramref name="text"/> was set, else false.</returns>
private bool TryGetTokenText(IContext context, TokenStringPart part, ContextualState state, out string text)
{
switch (part.LexToken)
{
case LexTokenToken lexToken:
{
// get token
IToken token = context.GetToken(lexToken.Name, enforceContext: false);
if (token == null)
{
state.AddInvalidTokens(lexToken.Name);
text = null;
return(false);
}
if (!token.IsReady)
{
this.State.AddUnreadyTokens(lexToken.Name);
text = null;
return(false);
}
// get token input
if (part.Input != null)
{
part.Input.UpdateContext(context);
if (!part.Input.IsReady)
{
state.MergeFrom(part.Input.GetDiagnosticState());
text = null;
return(false);
}
}
// validate input
if (!token.TryValidateInput(part.InputArgs, out string error))
{
state.AddErrors(error);
text = null;
return(false);
}
// get text representation
string[] values = token.GetValues(part.InputArgs).ToArray();
text = string.Join(", ", values);
return(true);
}
default:
text = part.LexToken.ToString();
return(true);
}
}