/
IronJSONTokenStream.cs
120 lines (107 loc) · 2.23 KB
/
IronJSONTokenStream.cs
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using System;
using System.Collections;
using System.Collections.Generic;
namespace IronJSON
{
internal class IronJSONTokenStream
{
private int m_line;
private ArrayList m_lineTable;
private List<IronJSONToken> m_tokens;
private int m_index;
/// <summary>
///
/// </summary>
public IronJSONTokenStream()
{
m_tokens = new List<IronJSONToken>();
m_lineTable = new ArrayList();
m_index = 0;
m_line = 1;
}
/// <summary>
/// Returns true if the position is at the end of the stream. The
/// only token available is PreviousToken.
/// </summary>
/// <returns>
/// A <see cref="System.Boolean"/>
/// </returns>
public bool AtEnd()
{
return m_index == m_tokens.Count;
}
/// <summary>
/// Resets the position to point back at the beginning.
/// </summary>
public void Reset()
{
m_index = 0;
}
/// <summary>
/// Adds a token to the stream.
/// </summary>
/// <param name="token">
/// A <see cref="IronJSONToken"/>
/// </param>
public void Add(IronJSONToken token)
{
m_tokens.Add(token);
m_lineTable.Add(m_line);
}
/// <summary>
/// Used for more helpful error messages.
/// </summary>
public void AddNewLine()
{
m_line++;
}
/// <summary>
/// Get's the current line number.
/// </summary>
/// <returns>
/// A <see cref="System.Int32"/>
/// </returns>
public int GetLineNumber()
{
if (m_index >= 0 && m_index < m_lineTable.Count)
return (int)m_lineTable[m_index];
else
return m_line;
}
/// <summary>
/// Returns the current token.
/// </summary>
public IronJSONToken CurrentToken
{
get
{
if (m_index >= 0 && m_index < m_tokens.Count)
return m_tokens[m_index];
else
return new IronJSONToken(TokenType.Nothing);
}
}
/// <summary>
/// Increments the stream position. Returns false when at
/// the end of the stream.
/// </summary>
/// <returns>
/// A <see cref="System.Boolean"/>
/// </returns>
public bool ToNextToken()
{
m_index++;
return !AtEnd();
}
/// <summary>
/// Returns the previous token. Keeps the position the same.
/// </summary>
public IronJSONToken PreviousToken
{
get
{
return m_tokens[m_index - 1];
}
}
}
}