public static PhpArray preg_grep(Context ctx, string pattern, PhpArray input, int flags = 0)
{
if (input == null)
{
return(null);
}
var result = new PhpArray(input.Count);
if (input.Count != 0)
{
var regex = new PerlRegex.Regex(pattern);
var enumerator = input.GetFastEnumerator();
while (enumerator.MoveNext())
{
var str = enumerator.CurrentValue.ToStringOrThrow(ctx);
var m = regex.Match(str);
// move a copy to return array if success and not invert or
// not success and invert
if (m.Success ^ (flags & PREG_GREP_INVERT) != 0)
{
result.Add(enumerator.CurrentKey, enumerator.CurrentValue.DeepCopy());
}
}
}
//
return(result);
}
public static PhpArray preg_split(string pattern, string subject, int limit = -1, int flags = 0)
{
if (limit == 0) // 0 does not make sense, php's behavior is as it is -1
{
limit = -1;
}
if (limit < -1) // for all other negative values it seems that is as limit == 1
{
limit = 1;
}
var regex = new PerlRegex.Regex(pattern);
//if (!regex.IsValid) return null;
var m = regex.Match(subject);
bool offset_capture = (flags & PREG_SPLIT_OFFSET_CAPTURE) != 0;
PhpArray result = new PhpArray();
int last_index = 0;
while (m.Success && (limit == -1 || --limit > 0) && last_index < subject.Length)
{
// add part before match
int length = m.Index - last_index;
if (length > 0 || (flags & PREG_SPLIT_NO_EMPTY) == 0)
{
result.Add(NewArrayItem(subject.Substring(last_index, length), last_index, offset_capture));
}
if (m.Value.Length > 0)
{
if ((flags & PREG_SPLIT_DELIM_CAPTURE) != 0) // add all captures but not whole pattern match (start at 1)
{
List <object> lastUnsucessfulGroups = null; // value of groups that was not successful since last succesful one
for (int i = 1; i < m.Groups.Count; i++)
{
Group g = m.Groups[i];
if (g.Length > 0 || (flags & PREG_SPLIT_NO_EMPTY) == 0)
{
// the value to be added into the result:
object value = NewArrayItem(g.Value, g.Index, offset_capture);
if (g.Success)
{
// group {i} was matched:
// if there was some unsuccesfull matches before, add them now:
if (lastUnsucessfulGroups != null && lastUnsucessfulGroups.Count > 0)
{
foreach (var x in lastUnsucessfulGroups)
{
result.Add(x);
}
lastUnsucessfulGroups.Clear();
}
// add the matched group:
result.Add(value);
}
else
{
// The match was unsuccesful, remember all the unsuccesful matches
// and add them only if some succesful match will follow.
// In PHP, unsuccessfully matched groups are trimmed by the end
// (regexp processing stops when other groups cannot be matched):
if (lastUnsucessfulGroups == null)
{
lastUnsucessfulGroups = new List <object>();
}
lastUnsucessfulGroups.Add(value);
}
}
}
}
last_index = m.Index + m.Length;
}
else // regular expression match an empty string => add one character
{
// always not empty
result.Add(NewArrayItem(subject.Substring(last_index, 1), last_index, offset_capture));
last_index++;
}
m = m.NextMatch();
}
// add remaining string (might be empty)
if (last_index < subject.Length || (flags & PREG_SPLIT_NO_EMPTY) == 0)
{
result.Add(NewArrayItem(subject.Substring(last_index), last_index, offset_capture));
}
return(result);
}
/// <summary>
/// Perform a regular expression match.
/// </summary>
static int Match(Context ctx, string pattern, string subject, out PhpArray matches, int flags, long offset, bool matchAll)
{
var regex = new PerlRegex.Regex(pattern);
var m = regex.Match(subject, (offset < subject.Length) ? (int)offset : subject.Length);
if ((regex.Options & PerlRegex.RegexOptions.PCRE_ANCHORED) != 0 && m.Success && m.Index != offset)
{
matches = PhpArray.NewEmpty();
return(-1);
}
if (m.Success)
{
if (!matchAll || (flags & PREG_PATTERN_ORDER) != 0)
{
matches = new PhpArray(m.Groups.Count);
}
else
{
matches = new PhpArray();
}
if (!matchAll)
{
GroupsToPhpArray(m.PcreGroups, (flags & PREG_OFFSET_CAPTURE) != 0, matches);
return(1);
}
// store all other matches in PhpArray matches
if ((flags & PREG_SET_ORDER) != 0) // cannot test PatternOrder, it is 0, SetOrder must be tested
{
return(FillMatchesArrayAllSetOrder(regex, m, ref matches, (flags & PREG_OFFSET_CAPTURE) != 0));
}
else
{
return(FillMatchesArrayAllPatternOrder(regex, m, ref matches, (flags & PREG_OFFSET_CAPTURE) != 0));
}
}
// no match has been found
if (matchAll && (flags & PREG_SET_ORDER) == 0)
{
// in that case PHP returns an array filled with empty arrays according to parentheses count
matches = new PhpArray(m.Groups.Count);
for (int i = 0; i < regex.GetGroupNumbers().Length; i++)
{
AddGroupNameToResult(regex, matches, i, (ms, groupName) =>
{
ms[groupName] = (PhpValue) new PhpArray();
});
matches[i] = (PhpValue) new PhpArray();
}
}
else
{
matches = PhpArray.NewEmpty(); // empty array
}
return(0);
}
public static int preg_match(Context ctx, string pattern, string subject)
{
var regex = new PerlRegex.Regex(pattern);
return(regex.Match(subject).Success ? 1 : 0);
}