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SQLLinter/Infrastructure/Parser/SqlStreamReaderBuilder.cs

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+using SQLLinter.Infrastructure.Interfaces;
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace SQLLinter.Infrastructure.Parser;
+
+public class SqlStreamReaderBuilder : ISqlStreamReaderBuilder
+{
+    private static readonly Regex _placeholderRegex = new Regex(@"\$\((?<placeholder>[^)]+)\)", RegexOptions.Compiled);
+
+    public StreamReader CreateReader(Stream sqlFileStream)
+    {
+        var sqlText = new StreamReader(sqlFileStream);
+        sqlFileStream.Seek(0, SeekOrigin.Begin);
+        var sql = ReplaceSqlPlaceholders(sqlText.ReadToEnd());
+        return new StreamReader(new MemoryStream(sqlText.CurrentEncoding.GetBytes(sql)));
+    }
+
+    private string ReplaceSqlPlaceholders(string sql)
+    {
+        var matches = _placeholderRegex.Matches(sql);
+
+        if (matches.Count == 0)
+        {
+            return sql;
+        }
+
+        var newSql = new StringBuilder();
+        var i = 0;
+
+        foreach (Match match in matches)
+        {
+            var placeholder = match.Groups["placeholder"].Value;
+            var replacement = match.Value;
+            newSql.Append(sql.Substring(i, match.Index - i));
+            newSql.Append(replacement);
+            i = match.Index + match.Length;
+        }
+
+        newSql.Append(sql.Substring(i));
+
+        return newSql.ToString();
+    }
+}