/// <summary>
/// Returns a regular expression that matches this regular expression zero or more times.</summary>
/// <param name="greedy">
/// <c>true</c> to prioritise longer matches (“greedy” matching); <c>false</c> to prioritise shorter matches
/// (“non-greedy” matching).</param>
protected TManyGenerex repeatInfinite <TManyGenerex, TManyGenerexMatch>(bool greedy)
where TManyGenerex : GenerexWithResultBase <T, IEnumerable <TResult>, TManyGenerex, TManyGenerexMatch>
where TManyGenerexMatch : GenerexMatch <T, IEnumerable <TResult> >
{
Func <matcher, GenerexWithResultBase <T, IEnumerable <TResult>, TManyGenerex, TManyGenerexMatch> .matcher> createRepeatInfiniteMatcher = (matcher inner) =>
{
GenerexWithResultBase <T, IEnumerable <TResult>, TManyGenerex, TManyGenerexMatch> .matcher newMatcher = null;
if (greedy)
{
newMatcher = (input, startIndex) => inner(input, startIndex).SelectMany(m => newMatcher(input, startIndex + m.Length)
.Select(m2 => new LengthAndResult <IEnumerable <TResult> >(m.Result.Concat(m2.Result), m.Length + m2.Length)))
.Concat(new LengthAndResult <IEnumerable <TResult> >(Enumerable.Empty <TResult>(), 0));
}
else
{
newMatcher = (input, startIndex) => new LengthAndResult <IEnumerable <TResult> >(Enumerable.Empty <TResult>(), 0)
.Concat(inner(input, startIndex).SelectMany(m => newMatcher(input, startIndex + m.Length)
.Select(m2 => new LengthAndResult <IEnumerable <TResult> >(m.Result.Concat(m2.Result), m.Length + m2.Length))));
}
return(newMatcher);
};
return(GenerexWithResultBase <T, IEnumerable <TResult>, TManyGenerex, TManyGenerexMatch> .Constructor(
createRepeatInfiniteMatcher(_forwardMatcher),
createRepeatInfiniteMatcher(_backwardMatcher)));
}
/// <summary>
/// Processes each match of this regular expression by running each result object through a provided selector.</summary>
/// <typeparam name="TOtherGenerex">
/// Generex type to return.</typeparam>
/// <typeparam name="TOtherGenerexMatch">
/// Generex match type that corresponds to <typeparamref name="TOtherGenerex"/></typeparam>
/// <typeparam name="TOtherResult">
/// Type of the object returned by <paramref name="selector"/>.</typeparam>
/// <param name="selector">
/// Function to process a regular expression match.</param>
protected TOtherGenerex processRaw <TOtherGenerex, TOtherGenerexMatch, TOtherResult>(Func <TResult, TOtherResult> selector)
where TOtherGenerex : GenerexWithResultBase <T, TOtherResult, TOtherGenerex, TOtherGenerexMatch>
where TOtherGenerexMatch : GenerexMatch <T, TOtherResult>
{
return(GenerexWithResultBase <T, TOtherResult, TOtherGenerex, TOtherGenerexMatch> .Constructor(
(input, startIndex) => _forwardMatcher(input, startIndex).Select(m => new LengthAndResult <TOtherResult>(selector(m.Result), m.Length)),
(input, startIndex) => _backwardMatcher(input, startIndex).Select(m => new LengthAndResult <TOtherResult>(selector(m.Result), m.Length))
));
}
/// <summary>
/// Returns a regular expression that only matches if the subarray matched by this regular expression also matches
/// the specified matching function, and if so, combines the first match’s result object with the second match
/// using a specified selector.</summary>
/// <typeparam name="TOtherResult">
/// The type of the result object associated with each match returned by <paramref name="innerMatch"/>.</typeparam>
/// <typeparam name="TOtherGenerex">
/// The type of the other regular expression. (This is either <see cref="Generex{T,TResult}"/> or <see
/// cref="Stringerex{TResult}"/>, but with <typeparamref name="TOtherResult"/> in place of <c>TResult</c>.)</typeparam>
/// <typeparam name="TOtherGenerexMatch">
/// The type of the match object for the other regular expression. (This is either <see
/// cref="GenerexMatch{T,TResult}"/> or <see cref="StringerexMatch{TResult}"/>, but with <typeparamref
/// name="TOtherResult"/> in place of <c>TResult</c>.)</typeparam>
/// <typeparam name="TCombinedResult">
/// The type of the combined result object returned by <paramref name="selector"/>.</typeparam>
/// <typeparam name="TCombinedGenerex">
/// The type of the new regular expression to be returned. (This is either <see cref="Generex{T,TResult}"/> or
/// <see cref="Stringerex{TResult}"/>, but with <typeparamref name="TCombinedResult"/> in place of
/// <c>TResult</c>.)</typeparam>
/// <typeparam name="TCombinedGenerexMatch">
/// The type of the match object for the regular expression to be returned. (This is either <see
/// cref="GenerexMatch{T,TResult}"/> or <see cref="StringerexMatch{TResult}"/>, but with <typeparamref
/// name="TCombinedResult"/> in place of <c>TResult</c>.)</typeparam>
/// <param name="innerMatch">
/// A function that runs on the subarray matched by this regular expression and returns either a match or
/// <c>null</c>.</param>
/// <param name="selector">
/// A selector function that combines the result object associated with the match of this regular expression, and
/// the match returned by <paramref name="innerMatch"/>, into a new result object.</param>
/// <remarks>
/// The match object passed into <paramref name="selector"/> is the same that <paramref name="innerMatch"/>
/// returned. Therefore, its <see cref="GenerexMatch{T}.Index"/> property refers to the index within the subarray,
/// not the original input sequence.</remarks>
protected TCombinedGenerex and <TOtherResult, TOtherGenerex, TOtherGenerexMatch, TCombinedResult, TCombinedGenerex, TCombinedGenerexMatch>(Func <T[], TOtherGenerexMatch> innerMatch, Func <TResult, TOtherGenerexMatch, TCombinedResult> selector)
where TOtherGenerex : GenerexWithResultBase <T, TOtherResult, TOtherGenerex, TOtherGenerexMatch>
where TOtherGenerexMatch : GenerexMatch <T, TOtherResult>
where TCombinedGenerex : GenerexWithResultBase <T, TCombinedResult, TCombinedGenerex, TCombinedGenerexMatch>
where TCombinedGenerexMatch : GenerexMatch <T, TCombinedResult>
{
return(GenerexWithResultBase <T, TCombinedResult, TCombinedGenerex, TCombinedGenerexMatch> .Constructor(
(input, startIndex) => _forwardMatcher(input, startIndex).SelectMany(m =>
{
var subarray = input.Subarray(startIndex, getLength(m));
var submatch = innerMatch(subarray);
return submatch == null ? Enumerable.Empty <LengthAndResult <TCombinedResult> >() : new[] { new LengthAndResult <TCombinedResult>(selector(m.Result, submatch), m.Length) };
}),
(input, startIndex) => _backwardMatcher(input, startIndex).SelectMany(m =>
{
var length = getLength(m);
var subarray = input.Subarray(startIndex + length, -length);
var submatch = innerMatch(subarray);
return submatch == null ? Enumerable.Empty <LengthAndResult <TCombinedResult> >() : new[] { new LengthAndResult <TCombinedResult>(selector(m.Result, submatch), m.Length) };
})
));
}
/// <summary>
/// Returns a regular expression that matches this regular expression any number of times within specified
/// boundaries.</summary>
/// <param name="min">
/// Minimum number of times to match.</param>
/// <param name="max">
/// Maximum number of times to match.</param>
/// <param name="greedy">
/// <c>true</c> to prioritise longer matches (“greedy” matching); <c>false</c> to prioritise shorter matches
/// (“non-greedy” matching).</param>
/// <exception cref="ArgumentOutOfRangeException">
/// <paramref name="min"/> is negative.</exception>
/// <exception cref="ArgumentException">
/// <paramref name="max"/> is smaller than <paramref name="min"/>.</exception>
protected TManyGenerex repeatBetween <TManyGenerex, TManyGenerexMatch>(int min, int max, bool greedy)
where TManyGenerex : GenerexWithResultBase <T, IEnumerable <TResult>, TManyGenerex, TManyGenerexMatch>
where TManyGenerexMatch : GenerexMatch <T, IEnumerable <TResult> >
{
if (min < 0)
{
throw new ArgumentOutOfRangeException("'min' cannot be negative.", "min");
}
if (max < min)
{
throw new ArgumentException("'max' cannot be smaller than 'min'.", "max");
}
var rm = new repeatMatcher
{
Greedy = greedy,
MinTimes = min,
MaxTimes = max,
InnerForwardMatcher = _forwardMatcher,
InnerBackwardMatcher = _backwardMatcher
};
return(GenerexWithResultBase <T, IEnumerable <TResult>, TManyGenerex, TManyGenerexMatch> .Constructor(rm.ForwardMatcher, rm.BackwardMatcher));
}
/// <summary>
/// Returns a regular expression that matches this regular expression, followed by the specified one, and
/// generates a result object that combines the original two matches.</summary>
protected TCombinedGenerex thenRaw <TOtherGenerex, TOtherGenerexMatch, TOtherResult, TCombinedGenerex, TCombinedGenerexMatch, TCombinedResult>(
GenerexWithResultBase <T, TOtherResult, TOtherGenerex, TOtherGenerexMatch> other, Func <TResult, TOtherResult, TCombinedResult> selector)
where TOtherGenerex : GenerexWithResultBase <T, TOtherResult, TOtherGenerex, TOtherGenerexMatch>
where TOtherGenerexMatch : GenerexMatch <T, TOtherResult>
where TCombinedGenerex : GenerexWithResultBase <T, TCombinedResult, TCombinedGenerex, TCombinedGenerexMatch>
where TCombinedGenerexMatch : GenerexMatch <T, TCombinedResult>
{
if (other == null)
{
throw new ArgumentNullException("other");
}
if (selector == null)
{
throw new ArgumentNullException("selector");
}
return(GenerexWithResultBase <T, TCombinedResult, TCombinedGenerex, TCombinedGenerexMatch> .Constructor(
(input, startIndex) => _forwardMatcher(input, startIndex).SelectMany(m => other._forwardMatcher(input, startIndex + m.Length)
.Select(m2 => new LengthAndResult <TCombinedResult>(selector(m.Result, m2.Result), m.Length + m2.Length))),
(input, startIndex) => other._backwardMatcher(input, startIndex).SelectMany(m2 => _backwardMatcher(input, startIndex + m2.Length)
.Select(m => new LengthAndResult <TCombinedResult>(selector(m.Result, m2.Result), m.Length + m2.Length)))
));
}