private static void EnterInteractiveMode()
{
Logger.Info(
"Axion code editor & interpreter mode.\n"
+ "Type 'exit' or 'quit' to exit mode, 'cls' to clear screen."
);
while (true)
{
// code editor header
string rawInput = ConsoleUI.Read("i>> ");
string input = rawInput.Trim().ToUpper();
switch (input)
{
case "":
// skip empty commands
ConsoleUI.ClearLine();
continue;
case "EXIT":
case "QUIT":
// exit from interpreter to main loop
Logger.Info("\nInteractive interpreter closed.");
return;
}
// TODO (UI) parse "help(module)" argument
// initialize editor
var editor = new ConsoleCodeEditor(
false,
true,
firstCodeLine: rawInput,
highlighter: new AxionSyntaxHighlighter()
);
string[] codeLines = editor.RunSession();
// interpret as source code and output result
Process(new SourceUnit(codeLines), SourceProcessingMode.Interpret);
}
}
/// <summary>
/// Creates visual representation of occurred error in console.
/// </summary>
internal void Print(SourceUnit unit)
{
//--------Error templates--------
//
// Error: Invalid operator.
//
// | 8 | variable ~~ "string"
// -----------------^^
// ...
//
// Error: Mismatching parenthesis.
// | 1 | func("string",
// ------------^
// | 2 | 'c',
// | 3 | 123
// ...
//
ConsoleColor color = Severity == BlameSeverity.Error
? ConsoleColor.Red
: ConsoleColor.DarkYellow;
// Write message
ConsoleUI.WriteLine((Message, color));
// Append file name if it's exists.
ConsoleUI.WriteLine("In file '" + unit.SourceFilePath + "'.");
Console.WriteLine();
string[] codeLines = unit.Code.Split(Spec.EndOfLines, StringSplitOptions.None);
var lines = new List <string>();
// limit rest of code by 5 lines
for (int i = Span.Start.Line;
i < codeLines.Length && lines.Count < 4;
i++)
{
lines.Add(codeLines[i].TrimEnd('\n', Spec.EndOfCode));
}
if (lines.Count > codeLines.Length - Span.Start.Line)
{
lines.Add("...");
}
// first line
// <line number>| <code line>
int pointerTailLength =
ConsoleCodeEditor.LineNumberWidth + Span.Start.Column;
int errorTokenLength;
if (Span.End.Line > Span.Start.Line)
{
errorTokenLength = lines[0].Length - Span.Start.Column;
}
else
{
errorTokenLength = Span.End.Column - Span.Start.Column;
}
// upside arrows (^), should be red-colored
string pointer =
// tail of pointer
new string(' ', pointerTailLength)
+
// pointer arrows
new string(
'^', // TODO (UI) compute token value length: include tab lengths
errorTokenLength
);
// Drawing ==========
// line with error
ConsoleCodeEditor.PrintLineNumber(Span.Start.Line + 1);
ConsoleUI.WriteLine(lines[0]);
// error pointer
ConsoleUI.WriteLine((pointer, color));
// next lines
for (int i = Span.Start.Line + 1; i < lines.Count; i++)
{
ConsoleCodeEditor.PrintLineNumber(i + 1);
ConsoleUI.WriteLine(lines[i]);
}
Console.WriteLine();
}
