/// <summary>
/// Visit a parse tree produced by <see cref="algoParser.stat_import"/>.
/// <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 VisitStat_import([NotNull] algoParser.Stat_importContext context)
{
return(VisitChildren(context));
}
//When a file is imported.
public override object VisitStat_import([NotNull] algoParser.Stat_importContext context)
{
//The following are checked for the parent library, in order:
//1. Executing directory of the script + whatever referenced folder path.
//2. Packages directory for Algo.
//3. Standard libraries.
//Make sure they're not trying to import multiple as a single identifier.
if (context.literal_params().expr().Length > 1 && context.AS_SYM() != null)
{
Error.Warning(context, "Failed to import scripts, cannot import multiple scripts as a single identifier.");
return(null);
}
//Import each.
foreach (var item in context.literal_params().expr())
{
//Getting directory tree text.
string importLoc = "";
//Evaluating the statement to get dir text.
AlgoValue locVal = (AlgoValue)VisitExpr(item);
if (locVal.Type != AlgoValueType.String)
{
Error.Fatal(context, "Given file path to import was not a string.");
return(null);
}
importLoc = (string)locVal.Value;
List <string> fileParts = importLoc.Split('/').ToList();
//Append the extension to the end (imports don't require an extension).
if (!fileParts[fileParts.Count - 1].EndsWith(".ag"))
{
fileParts[fileParts.Count - 1] = fileParts.Last() + ".ag";
}
//Is the import being placed into a different scope?
string importScope = "";
if (context.AS_SYM() != null)
{
//Yes, get the name of the scope.
importScope = context.IDENTIFIER().GetText();
}
//Test 1: Executing directory of the script.
string[] dirParts = new string[] { Environment.CurrentDirectory }.Concat(fileParts).ToArray();
string dirToCheck = CPFilePath.GetPlatformFilePath(dirParts);
//Is it there?
if (File.Exists(dirToCheck))
{
//Yes! Run the load function.
RunAlgoScript(dirToCheck, importScope);
continue;
}
//Nope.
//Test 2: Packages directory for Algo.
dirParts = DefaultDirectories.PackagesDirectory.Concat(fileParts).ToArray();
dirToCheck = CPFilePath.GetPlatformFilePath(dirParts);
//Is it there?
if (File.Exists(dirToCheck))
{
//Yep, load it.
RunAlgoScript(dirToCheck, importScope);
continue;
}
//Nope.
//Test 3: Standard libraries.
dirParts = DefaultDirectories.StandardLibDirectory.Concat(fileParts).ToArray();
dirToCheck = CPFilePath.GetPlatformFilePath(dirParts);
//Is it there?
if (File.Exists(dirToCheck))
{
//Yep, load it.
RunAlgoScript(dirToCheck, importScope);
continue;
}
//No, nowhere else to check from, so throw a linking warning.
Error.Warning(context, "Failed to link the Algo script '" + importLoc + "'. It has not been loaded.");
}
return(null);
}
/// <summary>
/// Exit a parse tree produced by <see cref="algoParser.stat_import"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitStat_import([NotNull] algoParser.Stat_importContext context)
{
}
