167 lines
2.9 KiB
C#
167 lines
2.9 KiB
C#
// ILReader.cs
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// Author: Sergey Chaban (serge@wildwestsoftware.com)
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using System;
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using System.IO;
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using System.Text;
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using System.Collections;
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namespace Mono.ILASM {
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/// <summary>
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/// </summary>
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public class ILReader {
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private StreamReader reader;
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private Stack putback_stack;
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private Location location;
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private Location markedLocation;
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public ILReader (StreamReader reader)
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{
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this.reader = reader;
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putback_stack = new Stack ();
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location = new Location ();
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markedLocation = Location.Unknown;
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}
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/// <summary>
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/// </summary>
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public Location Location {
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get {
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return location;
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}
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}
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/// <summary>
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/// Provides access to underlying StreamReader.
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/// </summary>
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public StreamReader BaseReader {
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get {
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return reader;
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}
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}
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private int DoRead ()
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{
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if (putback_stack.Count > 0)
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return (char) putback_stack.Pop ();
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return reader.Read ();
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}
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private int DoPeek ()
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{
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if (putback_stack.Count > 0)
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return (char) putback_stack.Peek ();
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return reader.Peek ();
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}
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/// <summary>
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/// </summary>
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/// <returns></returns>
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public int Read ()
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{
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int read = DoRead ();
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if (read == '\n')
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location.NewLine ();
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else
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location.NextColumn ();
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return read;
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}
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/// <summary>
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/// </summary>
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/// <returns></returns>
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public int Peek ()
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{
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return DoPeek ();
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}
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/// <summary>
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/// </summary>
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public void Unread (char c)
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{
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putback_stack.Push (c);
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if ('\n' == c)
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location.PreviousLine ();
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location.PreviousColumn ();
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}
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/// <summary>
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/// </summary>
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/// <param name="chars"></param>
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public void Unread (char [] chars)
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{
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for (int i=chars.Length-1; i>=0; i--)
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Unread (chars[i]);
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}
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/// <summary>
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/// </summary>
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/// <param name="c"></param>
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public void Unread (int c)
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{
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Unread ((char)c);
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}
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/// <summary>
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/// </summary>
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public void SkipWhitespace ()
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{
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int ch = Read ();
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for (; ch != -1 && Char.IsWhiteSpace((char) ch); ch = Read ());
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if (ch != -1) Unread (ch);
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}
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/// <summary>
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/// </summary>
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/// <returns></returns>
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public string ReadToWhitespace ()
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{
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StringBuilder sb = new StringBuilder ();
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int ch = Read ();
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for (; ch != -1 && !Char.IsWhiteSpace((char) ch); sb.Append ((char) ch), ch = Read ());
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if (ch != -1) Unread (ch);
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return sb.ToString ();
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}
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/// <summary>
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/// </summary>
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public void MarkLocation ()
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{
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if (markedLocation == Location.Unknown) {
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markedLocation = new Location (location);
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} else {
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markedLocation.CopyFrom (location);
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}
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}
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/// <summary>
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/// </summary>
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public void RestoreLocation ()
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{
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if (markedLocation != Location.Unknown) {
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location.CopyFrom (markedLocation);
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}
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}
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}
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}
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