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REPL improvement #9

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130 changes: 130 additions & 0 deletions mc/LanguageRepl.cs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,130 @@
using System;
using System.Collections.Generic;
using System.Linq;
using Language.CodeAnalysis;
using Language.CodeAnalysis.Text;

namespace Language
{
internal sealed class LanguageRepl : Repl
{
private Compilation _previous;
private bool _showTree;
private bool _showProgram;
private readonly Dictionary<VariableSymbol, object> _variables = new Dictionary<VariableSymbol, object>();

protected override void RenderLine(string line)
{
var tokens = SyntaxTree.ParseTokens(line, false);
foreach (var token in tokens)
{
var isKeyword = token.Kind.ToString().EndsWith("Keyword");
var isNumber = token.Kind == SyntaxKind.NumberToken;
if (isKeyword)
Console.ForegroundColor = ConsoleColor.Blue;
else if(!isNumber)
Console.ForegroundColor = ConsoleColor.White;

Console.WriteLine(token.Text);
Console.ResetColor();
}
}

protected override void EvaluateMetaCommand(string input)
{
switch (input)
{
case "/showtree":
_showTree = !_showTree;
Console.WriteLine(_showTree ? "Now showing parse trees" : "No longer showing parse trees");
break;
case "/showprogram":
_showProgram = !_showProgram;
Console.WriteLine(_showProgram ? "Now showing bound tree" : "No longer showing bound tree");
break;
case "/cls":
Console.Clear();
break;
case "/reset":
_previous = null;
_variables.Clear();
break;
default:
base.EvaluateMetaCommand(input);
break;
}
}

protected override bool IsCompleteSubmission(string text)
{
if (string.IsNullOrEmpty(text))
return true;

var syntaxTree = SyntaxTree.Parse(text);
if(syntaxTree.Diagnostics.Any())
return false;

return true;
}

protected override void EvaluateSubmission(string text)
{
var syntaxTree = SyntaxTree.Parse(text);

var compilation = _previous == null
? new Compilation(syntaxTree)
: _previous.ContinueWith(syntaxTree);

if (_showTree)
syntaxTree.Root.WriteTo(Console.Out);

if (_showProgram)
compilation.EmitTree(Console.Out);

var result = compilation.Evaluate(_variables);

if (!result.Diagnostics.Any())
{
Console.WriteLine(result.Value);
_previous = compilation;
}
else
{
foreach (var diagnostic in result.Diagnostics)
{
var lineIndex = syntaxTree.Text.GetLineIndex(diagnostic.Span.Start);
var line = syntaxTree.Text.Lines[lineIndex];
var lineNumber = lineIndex + 1;
var character = diagnostic.Span.Start - line.Start + 1;

Console.WriteLine();

Console.ForegroundColor = ConsoleColor.DarkRed;
Console.Write($"({lineNumber}, {character}): ");
Console.WriteLine(diagnostic);
Console.ResetColor();

var prefixSpan = TextSpan.FromBounds(line.Start, diagnostic.Span.Start);
var suffixSpan = TextSpan.FromBounds(diagnostic.Span.End, line.End);

var prefix = syntaxTree.Text.ToString(prefixSpan);
var error = syntaxTree.Text.ToString(diagnostic.Span);
var suffix = syntaxTree.Text.ToString(suffixSpan);

Console.Write(" ");
Console.Write(prefix);

Console.ForegroundColor = ConsoleColor.DarkRed;
Console.Write(error);
Console.ResetColor();

Console.Write(suffix);

Console.WriteLine();
}

Console.WriteLine();
}
}
}
}
127 changes: 6 additions & 121 deletions mc/Program.cs
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Original file line number Diff line number Diff line change
@@ -1,129 +1,14 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Language.CodeAnalysis;
using Language.CodeAnalysis.Binding;
using Language.CodeAnalysis.Binding;
using Language.CodeAnalysis.Syntax;
using Language.CodeAnalysis.Text;

namespace Language
{
internal class Program
internal static class Program
{
private static void Main(string[] args)
private static void Main()
{
var showTree = false;
var showProgram = false;
var variables = new Dictionary<VariableSymbol, object>();
var textBuilder = new StringBuilder();

Compilation previous = null;

while(true)
{
if (textBuilder.Length == 0)
Console.Write("> ");
else
Console.Write("· ");

var input = Console.ReadLine();
var isBlank = string.IsNullOrWhiteSpace(input);

if(textBuilder.Length == 0)
{
if (isBlank)
{
break;
}
else if (input == "/showtree")
{
showTree = !showTree;
Console.WriteLine(showTree ? "Now showing parse trees" : "No longer showing parse trees");
continue;
}
else if (input == "/showprogram")
{
showProgram = !showProgram;
Console.WriteLine(showProgram ? "Now showing bound tree" : "No longer showing bound tree");
continue;
}
else if (input == "/cls")
{
Console.Clear();
continue;
}
else if(input == "/reset")
{
previous = null;
continue;
}
}

textBuilder.AppendLine(input);
var text = textBuilder.ToString();

var syntaxTree = SyntaxTree.Parse(text);

if (!isBlank && syntaxTree.Diagnostics.Any())
continue;

var compilation = previous == null ? new Compilation(syntaxTree) : previous.ContinueWith(syntaxTree);


if (showTree)
syntaxTree.Root.WriteTo(Console.Out);

if (showProgram)
compilation.EmitTree(Console.Out);

var result = compilation.Evaluate(variables);

if (!result.Diagnostics.Any())
{
Console.WriteLine(result.Value);
previous = compilation;
}
else
{
foreach (var diagnostic in result.Diagnostics)
{
var lineIndex = syntaxTree.Text.GetLineIndex(diagnostic.Span.Start);
var line = syntaxTree.Text.Lines[lineIndex];
var lineNumber = lineIndex + 1;

var character = diagnostic.Span.Start - line.Start + 1;

Console.WriteLine();

Console.ForegroundColor = ConsoleColor.DarkRed;
Console.Write($"({lineNumber}, {character}): ");
Console.WriteLine(diagnostic);
Console.ResetColor();

var prefixSpan = TextSpan.FromBounds(line.Start, diagnostic.Span.Start);
var suffixSpan = TextSpan.FromBounds(diagnostic.Span.End, line.End);

var prefix = syntaxTree.Text.ToString(prefixSpan);
var error = syntaxTree.Text.ToString(diagnostic.Span);
var suffix = syntaxTree.Text.ToString(suffixSpan);

Console.Write(" ");
Console.Write(prefix);

Console.ForegroundColor = ConsoleColor.DarkRed;
Console.Write(error);
Console.ResetColor();

Console.Write(suffix);
Console.WriteLine();
}

Console.WriteLine();
}

textBuilder.Clear();
}
var repl = new LanguageRepl();
repl.Run();
}
}
}
}
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