/// <summary>
/// Discards loaded pages up to the specified token index.
/// </summary>
/// <param name="index">The index of the first token to preserve.</param>
/// <returns>true if pages were trimmed; otherwise, false.</returns>
public Boolean Trim(Int32 index)
{
if (index < offset || pageCount == 0)
{
return(false);
}
var pageIndex = (index - offset) / UvssLexerStreamPage.Size;
if (pageIndex == 0 || pageIndex >= pageCount)
{
return(false);
}
pageCount = pageCount - pageIndex;
Array.Copy(pages, pageIndex, pages, 0, pageCount);
for (int i = pageCount; i < pages.Length; i++)
{
pages[i] = new UvssLexerStreamPage();
}
offset += pageIndex * UvssLexerStreamPage.Size;
return(true);
}
/// <summary>
/// Ensures that the stream's array of pages has at least
/// the specified capacity.
/// </summary>
/// <param name="capacity">The requested capacity.</param>
private void EnsurePageCapacity(Int32 capacity)
{
if (pages == null)
{
if (capacity < 4)
{
capacity = 4;
}
pages = new UvssLexerStreamPage[capacity];
}
else
{
if (capacity <= pages.Length)
{
return;
}
var size = Math.Max(capacity, pages.Length * 2);
var temp = new UvssLexerStreamPage[size];
Array.Copy(pages, temp, pageCount);
pages = temp;
}
for (int i = 0; i < pages.Length; i++)
{
if (pages[i] == null)
{
pages[i] = new UvssLexerStreamPage();
}
}
}
/// <summary>
/// Ensures that the stream's array of pages has at least
/// the specified capacity.
/// </summary>
/// <param name="capacity">The requested capacity.</param>
private void EnsurePageCapacity(Int32 capacity)
{
if (pages == null)
{
if (capacity < 4)
capacity = 4;
pages = new UvssLexerStreamPage[capacity];
}
else
{
if (capacity <= pages.Length)
return;
var size = Math.Max(capacity, pages.Length * 2);
var temp = new UvssLexerStreamPage[size];
Array.Copy(pages, temp, pageCount);
pages = temp;
}
for (int i = 0; i < pages.Length; i++)
{
if (pages[i] == null)
pages[i] = new UvssLexerStreamPage();
}
}
/// <summary>
/// Discards loaded pages up to the specified token index.
/// </summary>
/// <param name="index">The index of the first token to preserve.</param>
/// <returns>true if pages were trimmed; otherwise, false.</returns>
public Boolean Trim(Int32 index)
{
if (index < offset || pageCount == 0)
return false;
var pageIndex = (index - offset) / UvssLexerStreamPage.Size;
if (pageIndex == 0 || pageIndex >= pageCount)
return false;
pageCount = pageCount - pageIndex;
Array.Copy(pages, pageIndex, pages, 0, pageCount);
for (int i = pageCount; i < pages.Length; i++)
pages[i] = new UvssLexerStreamPage();
offset += pageIndex * UvssLexerStreamPage.Size;
return true;
}
