using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using HeuristicLab.Grammars;
using Attribute = HeuristicLab.Grammars.Attribute;

namespace CodeGenerator {
  public class SourceBuilder {
    private readonly StringBuilder sb;
    private int indent;
    public SourceBuilder() {
      sb = new StringBuilder();
      indent = 0;
    }

    public SourceBuilder BeginBlock() {
      indent += 2;
      return AppendLine();
    }
    public SourceBuilder EndBlock() {
      indent -= 2;
      return AppendLine();
    }
    public SourceBuilder Append(string str) {
      sb.Append(' ', indent).Append(str);
      return this;
    }
    public SourceBuilder AppendFormat(string fmtString, params object[] args) {
      sb.Append(' ', indent).AppendFormat(fmtString, args);
      return this;
    }
    public SourceBuilder AppendLine() {
      sb.AppendLine();
      return this;
    }
    public SourceBuilder AppendLine(string str) {
      sb.AppendLine(str);
      return this;
    }
    public SourceBuilder Replace(string oldValue, string newValue) {
      sb.Replace(oldValue, newValue);
      return this;
    }

    public override string ToString() {
      return sb.ToString();
    }
  }
}