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Added error-line preview to frontend.

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This commit is contained in:
arookas 2015-12-12 16:51:31 -05:00
parent 85149f931e
commit 2fcab65c22
1 changed files with 39 additions and 1 deletions
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40
frontend/main.cs
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@ -1,6 +1,7 @@
using System;
using System.Diagnostics;
using System.IO;
using System.Text;
namespace arookas
{
@ -37,7 +38,7 @@ namespace arookas
if (results.Error is sunScriptException)
{
var error = results.Error as sunScriptException;
Error(" \"{0}\"\n pos ({1}, {2})\n{3}", error.Location.File, error.Location.Line, error.Location.Column, error.Message);
Error(" in file \"{0}\"\n at line {1}, col {2}\n\n{3}{4}", error.Location.File, error.Location.Line, error.Location.Column, GetErrorPreview(error.Location), error.Message);
exitCode = 1;
}
else
@ -123,6 +124,43 @@ namespace arookas
outputFile = prm[0];
}
static string GetErrorPreview(sunSourceLocation location)
{
Stream file;
try
{
file = File.OpenRead(location.File);
}
catch
{
// simply don't do a preview if opening a file fails
return "";
}
using (var reader = new StreamReader(file))
{
// skip to line
for (var line = 1; line < location.Line; ++line)
{
reader.ReadLine();
}
// generate column string
var sb = new StringBuilder();
var preview = reader.ReadLine();
sb.AppendLine(preview);
for (var column = 1; column < location.Column; ++column)
{
switch (preview[column - 1])
{
case '\t': sb.Append('\t'); break;
default: sb.Append(" "); break;
}
}
sb.Append("^");
sb.Append("\n");
return sb.ToString();
}
}
static void Message(string format, params object[] args) { Console.Write(format, args); }
static void Warning(string format, params object[] args)
{