/// <summary>
/// Returns a value indicating whether the input <see cref="Lexical.Token"/> matches the grammar rule.
/// </summary>
/// <param name="lexer">The <see cref="BranchedLexer"/> that provides the input <see cref="Lexical.Token"/>.</param>
/// <param name="result">When this method returns, contains the parsing result if the input <see cref="Lexical.Token"/> matches the grammar rule; otherwise, is <c>default(TResult)</c></param>
/// <returns><see langword="true"/> if the input <see cref="Lexical.Token"/> matches the grammar rule; otherwise <see langword="false"/>.</returns>
/// <exception cref="ArgumentNullException"><paramref name="lexer"/> is <see langword="null"/>.</exception>
public override bool TryParse(BranchedLexer lexer, out TResult result)
{
if (lexer == null)
{
throw new ArgumentNullException();
}
TResult r;
BranchedLexer branch;
branch = lexer.NewBranch();
if (First.TryParse(branch, out r))
{
lexer.Merge(branch);
branch.Dispose();
result = r;
return(true);
}
branch.Dispose();
branch = lexer.NewBranch();
if (Second.TryParse(branch, out r))
{
lexer.Merge(branch);
branch.Dispose();
result = r;
return(true);
}
else
{
branch.Dispose();
result = default(TResult);
return(false);
}
}
/// <summary>
/// Returns a value indicating whether the input <see cref="Lexical.Token"/> matches the grammar rule.
/// </summary>
/// <param name="lexer">The <see cref="BranchedLexer"/> that provides the input <see cref="Lexical.Token"/>.</param>
/// <param name="result">When this method returns, contains the parsing result if the input <see cref="Lexical.Token"/> matches the grammar rule; otherwise, is <c>default(TResult)</c></param>
/// <returns><see langword="true"/> if the input <see cref="Lexical.Token"/> matches the grammar rule; otherwise <see langword="false"/>.</returns>
/// <exception cref="ArgumentNullException"><paramref name="lexer"/> is <see langword="null"/>.</exception>
public override bool TryParse(BranchedLexer lexer, out TResult result)
{
if (lexer == null)
{
throw new ArgumentNullException();
}
T loopr;
List <T> list = new List <T>();
BranchedLexer branch0, branch1;
branch0 = lexer.NewBranch();
bool check = true;
int count = 0;
while (true)
{
branch1 = branch0.NewBranch();
check = Content.TryParse(branch1, out loopr);
if (check)
{
branch0.Dispose();
branch0 = branch1;
list.Add(loopr);
count++;
}
else
{
break;
}
if (Max > 0 && count == Max)
{
break;
}
}
branch1.Dispose();
if (count < Min)
{
branch0.Dispose();
result = default(TResult);
return(false);
}
else
{
lexer.Merge(branch0);
branch0.Dispose();
result = Func(list);
return(true);
}
}