/// <summary>
/// Returns a value indicating whether the next character matches the lexical rule.
/// </summary>
/// <param name="reader">The <see cref="BranchedReader"/> that provides the input character.</param>
/// <returns><see langword="true"/> if the next character matches the lexical rule; otherwise <see langword="false"/>.</returns>
/// <exception cref="ArgumentNullException"><paramref name="reader"/> is <see langword="null"/>.</exception>
public override bool Match(BranchedReader reader)
{
if (reader == null)
{
throw new ArgumentNullException();
}
BranchedReader branch1 = reader.NewBranch();
BranchedReader branch2 = reader.NewBranch();
bool check1 = First.Match(branch1);
bool check2 = Second.Match(branch2);
if (!check1 && !check2)
{
branch1.Dispose();
branch2.Dispose();
return(false);
}
if (check1 && check2)
{
reader.Merge(branch1.Position > branch2.Position ? branch1 : branch2);
}
else if (check1)
{
reader.Merge(branch1);
}
else if (check2)
{
reader.Merge(branch2);
}
branch1.Dispose();
branch2.Dispose();
return(true);
}
/// <summary>
/// Merges the reader to the state of another specified branch, and returns a string that contains the characters between the positions of the current reader and <paramref name="branch"/>.
/// </summary>
/// <param name="branch">The specified branch.</param>
/// <returns>A string that contains the characters between the positions of the current reader and <paramref name="branch"/> if the current reader is ahead of <paramref name="branch"/>; A empty string if the current reader and <paramref name="branch"/> are in the same position; <see langword="null"/> if the current reader is behind <paramref name="branch"/>.</returns>
/// <exception cref="ObjectDisposedException">The current reader is closed.</exception>
/// <exception cref="InvalidOperationException">The reader has a different root with the specified branch.</exception>
/// <exception cref="ArgumentNullException">The parameter is <see langword="null"/>.</exception>
public string Merge(BranchedReader branch)
{
if (branch == null)
{
throw new ArgumentNullException();
}
if (HasSameRoot(branch))
{
if (Position <= branch.Position)
{
var sb = new StringBuilder();
while (Position < branch.Position)
{
sb.Append(Read());
}
return(sb.ToString());
}
else
{
_buffer = new Queue <char>(branch._buffer);
Line = branch.Line;
Span = branch.Span;
Position = branch.Position;
return(null);
}
}
else
{
throw new InvalidOperationException(ExceptionResource.DifferentRoot);
}
}
/// <summary>
/// Returns a value indicating whether the next character matches the lexical rule.
/// </summary>
/// <param name="reader">The <see cref="BranchedReader"/> that provides the input character.</param>
/// <returns><see langword="true"/> if the next character matches the lexical rule; otherwise <see langword="false"/>.</returns>
/// <exception cref="ArgumentNullException"><paramref name="reader"/> is <see langword="null"/>.</exception>
public override bool Match(BranchedReader reader)
{
if (reader == null)
{
throw new ArgumentNullException();
}
return(First.Match(reader) && Second.Match(reader));
}
/// <summary>
/// Returns a value indicating whether the next character matches the lexical rule.
/// </summary>
/// <param name="reader">The <see cref="BranchedReader"/> that provides the input character.</param>
/// <returns><see langword="true"/> if the next character matches the lexical rule; otherwise <see langword="false"/>.</returns>
/// <exception cref="ArgumentNullException"><paramref name="reader"/> is <see langword="null"/>.</exception>
public override bool Match(BranchedReader reader)
{
if (reader == null)
{
throw new ArgumentNullException();
}
return(true);
}
private BranchedReader(BranchedReader parent)
{
_reader = parent._reader;
_branches = parent._branches;
_branches.Add(this);
_buffer = new Queue <char>(parent._buffer);
Line = parent.Line;
Span = parent.Span;
Position = parent.Position;
}
/// <summary>
/// Returns a value indicating whether the reader has the same root reader as another specified branch.
/// </summary>
/// <param name="branch">The specified branch.</param>
/// <returns><see langword="true"/> if the lexer has the same root reader as <paramref name="branch"/>; otherwise <see langword="false"/>.</returns>
/// <exception cref="ObjectDisposedException">The current reader is closed.</exception>
/// <exception cref="ArgumentNullException">The parameter is <see langword="null"/>.</exception>
public bool HasSameRoot(BranchedReader branch)
{
if (branch == null)
{
throw new ArgumentNullException();
}
if (!_branches.Contains(this))
{
throw new ObjectDisposedException(ToString());
}
else if (!_branches.Contains(branch))
{
throw new ObjectDisposedException(branch.ToString());
}
return(this._reader.Equals(branch._reader));
}
/// <summary>
/// Returns a value indicating whether the next character matches the lexical rule.
/// </summary>
/// <param name="reader">The <see cref="BranchedReader"/> that provides the input character.</param>
/// <returns><see langword="true"/> if the next character matches the lexical rule; otherwise <see langword="false"/>.</returns>
/// <exception cref="ArgumentNullException"><paramref name="reader"/> is <see langword="null"/>.</exception>
public override bool Match(BranchedReader reader)
{
if (reader == null)
{
throw new ArgumentNullException();
}
char c = reader.Read();
if (Predicate(c))
{
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// Returns a value indicating whether the next character matches the lexical rule.
/// </summary>
/// <param name="reader">The <see cref="BranchedReader"/> that provides the input character.</param>
/// <returns><see langword="true"/> if the next character matches the lexical rule; otherwise <see langword="false"/>.</returns>
/// <exception cref="ArgumentNullException"><paramref name="reader"/> is <see langword="null"/>.</exception>
public override bool Match(BranchedReader reader)
{
if (reader == null)
{
throw new ArgumentNullException();
}
BranchedReader branch0, branch1;
branch0 = reader.NewBranch();
bool check = true;
int count = 0;
while (true)
{
branch1 = branch0.NewBranch();
check = Content.Match(branch1);
if (check)
{
branch0.Dispose();
branch0 = branch1;
count++;
}
else
{
break;
}
if (Max > 0 && count == Max)
{
break;
}
}
branch1.Dispose();
if (count < Min)
{
branch0.Dispose();
return(false);
}
else
{
reader.Merge(branch0);
branch0.Dispose();
return(true);
}
}
/// <summary>
/// Returns a value indicating whether the next character matches the lexical rule.
/// </summary>
/// <param name="reader">The <see cref="BranchedReader"/> that provides the input character.</param>
/// <returns><see langword="true"/> if the next character matches the lexical rule; otherwise <see langword="false"/>.</returns>
/// <exception cref="ArgumentNullException"><paramref name="reader"/> is <see langword="null"/>.</exception>
public override bool Match(BranchedReader reader)
{
if (reader == null)
{
throw new ArgumentNullException();
}
char c = reader.Read();
if (c == '\0')
{
return(false);
}
if (!(From <= c && c <= To))
{
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// Returns a value indicating whether the next character matches the lexical rule.
/// </summary>
/// <param name="reader">The <see cref="BranchedReader"/> that provides the input character.</param>
/// <returns><see langword="true"/> if the next character matches the lexical rule; otherwise <see langword="false"/>.</returns>
/// <exception cref="ArgumentNullException"><paramref name="reader"/> is <see langword="null"/>.</exception>
public override bool Match(BranchedReader reader)
{
if (reader == null)
{
throw new ArgumentNullException();
}
char c = reader.Read();
if (c == '\0')
{
return(false);
}
if (!CharSet.Contains(c))
{
return(true);
}
else
{
return(false);
}
}
/// <summary> /// Returns a value indicating whether the next character matches the lexical rule. /// </summary> /// <param name="reader">The <see cref="BranchedReader"/> that provides the input character.</param> /// <returns><see langword="true"/> if the next character matches the lexical rule; otherwise <see langword="false"/>.</returns> /// <exception cref="ArgumentNullException"><paramref name="reader"/> is <see langword="null"/>.</exception> public abstract bool Match(BranchedReader reader);
