public override Completion InternalConstruct(IReadOnlyList <IValue> arguments, Object?newTarget)
{
var pattern = arguments.At(0, UndefinedValue.Instance);
var flags = arguments.At(1, UndefinedValue.Instance);
var patternIsRegExpComp = IsRegExp(pattern);
if (patternIsRegExpComp.IsAbrupt())
{
return(patternIsRegExpComp);
}
var patternIsRegExp = patternIsRegExpComp.Other;
if (newTarget == null)
{
newTarget = this;
if (patternIsRegExp && flags == UndefinedValue.Instance)
{
var patternObject = (pattern as Object) !;
var patternConstructor = patternObject.Get("constructor");
if (patternConstructor.IsAbrupt())
{
return(patternConstructor);
}
if (patternObject == newTarget)
{
return(Completion.NormalCompletion(pattern));
}
}
}
IValue P, F;
if (pattern is RegExpObject r)
{
P = new StringValue(r.OriginalSource);
if (flags == UndefinedValue.Instance)
{
F = new StringValue(r.OriginalFlags);
}
else
{
F = flags;
}
}
else if (patternIsRegExp)
{
var patternObject = (pattern as Object) !;
var PComp = patternObject.Get("source");
if (PComp.IsAbrupt())
{
return(PComp);
}
P = PComp.value !;
if (flags == UndefinedValue.Instance)
{
var FComp = patternObject.Get("flags");
if (FComp.IsAbrupt())
{
return(FComp);
}
F = FComp.value !;
}
else
{
F = flags;
}
}
else
{
P = pattern;
F = flags;
}
return(RegExpObject.RegExpAllocAndInitialize(P, F));
}
public static Completion RegExpAllocAndInitialize(string P, string F)
{
var allowedFlags = "gimsuy";
List <char> invalidFlags;
if ((invalidFlags = F.Where(c => !allowedFlags.Contains(c, StringComparison.Ordinal)).ToList()).Any())
{
if (invalidFlags.Count == 1)
{
return(Completion.ThrowTypeError($"'{invalidFlags[0]}' is not a valid RegExp flag."));
}
else
{
return(Completion.ThrowTypeError($"These flags not valid RegExp flags: {{ {string.Join(", ", invalidFlags.Select(f => $"'{f}'"))} }}"));
}
}
else if (F.Distinct().Count() != F.Length)
{
return(Completion.ThrowTypeError($"RegExp flags should not contain duplicates."));
}
var BMP = !F.Contains('u', StringComparison.Ordinal);
var options = RegexOptions.ECMAScript;
if (F.Contains('m', StringComparison.Ordinal))
{
options |= RegexOptions.Multiline;
}
if (F.Contains('s', StringComparison.Ordinal))
{
options |= RegexOptions.Singleline;
options &= ~RegexOptions.ECMAScript;
}
if (F.Contains('i', StringComparison.Ordinal))
{
options |= RegexOptions.IgnoreCase;
}
if (options.HasFlag(RegexOptions.Multiline))
{
int index = 0;
var newPattern = P;
while ((index = newPattern.IndexOf("$", index, StringComparison.Ordinal)) != -1)
{
if (index > 0 && newPattern[index - 1] != '\\')
{
newPattern = newPattern.Substring(0, index) + @"\r?" + newPattern.Substring(index);
index += 4;
}
}
P = newPattern;
}
Regex regex;
try
{
regex = new Regex(P, options);
}
catch
{
return(Completion.ThrowSyntaxError("Invalid RegEx"));
}
var obj = new RegExpObject(P, F, regex);
var set = obj.Set("lastIndex", new NumberValue(0), true);
if (set.IsAbrupt())
{
return(set);
}
return(Completion.NormalCompletion(obj));
}
private static Completion RegExpBuiltinExec(RegExpObject R, string S)
{
var length = S.Length;
int lastIndex;
{
var lastIndexComp = R.Get("lastIndex");
if (lastIndexComp.IsAbrupt())
{
return(lastIndexComp);
}
var lastIndexLength = lastIndexComp.value !.ToLength();
if (lastIndexLength.IsAbrupt())
{
return(lastIndexLength);
}
lastIndex = (int)lastIndexLength.Other;
}
var flags = R.OriginalFlags;
var global = flags.Contains('g', StringComparison.Ordinal);
var sticky = flags.Contains('y', StringComparison.Ordinal);
if (!global && !sticky)
{
lastIndex = 0;
}
var matcher = R.RegExpMatcher;
var fullUnicode = flags.Contains('u', StringComparison.Ordinal);
var matchSucceeded = false;
Match?r = null;
while (!matchSucceeded)
{
if (lastIndex > length)
{
if (global || sticky)
{
var set = R.Set("lastIndex", NumberValue.PositiveZero, true);
if (set.IsAbrupt())
{
return(set);
}
}
return(Completion.NormalCompletion(NullValue.Instance));
}
r = matcher.Match(S, lastIndex);
if (!r.Success)
{
if (sticky)
{
var set = R.Set("lastIndex", NumberValue.PositiveZero, true);
if (set.IsAbrupt())
{
return(set);
}
return(Completion.NormalCompletion(NullValue.Instance));
}
lastIndex = AdvanceStringIndex(S, lastIndex, fullUnicode);
}
else
{
matchSucceeded = true;
}
}
var e = r !.Index + r.Length;
if (fullUnicode)
{
// e is an index into the Input character list, derived from S, matched by matcher.
// Let eUTF be the smallest index into S that corresponds to the character at element e of Input.
// If e is greater than or equal to the number of elements in Input, then eUTF is the number of code units in S.
// Set e to eUTF.
var indexes = StringInfo.ParseCombiningCharacters(S);
if (r.Index < indexes.Length)
{
var sub = StringInfo.GetNextTextElement(S, r.Index);
e += sub.Length - 1;
}
}
if (global || sticky)
{
var set = R.Set("lastIndex", new NumberValue(e), true);
if (set.IsAbrupt())
{
return(set);
}
}
var n = r.Groups.Count;
var A = ArrayObject.ArrayCreate(n + 1);
Utils.CreateDataProperty(A, "index", new NumberValue(lastIndex));
Utils.CreateDataProperty(A, "input", new StringValue(S));
Utils.CreateDataProperty(A, "0", new StringValue(r.Value));
IValue groups;
if (R.RegExpMatcher.GetGroupNames().Any())
{
groups = Utils.ObjectCreate(null);
}
else
{
groups = UndefinedValue.Instance;
}
Utils.CreateDataProperty(A, "groups", groups);
for (int i = 0; i <= n; i++)
{
var captureI = r.Groups[i];
IValue capturedValue;
if (captureI.Success)
{
if (fullUnicode)
{
capturedValue = new StringValue(StringInfo.GetNextTextElement(S, captureI.Index));
}
else
{
capturedValue = new StringValue(captureI.Value);
}
}
else
{
capturedValue = UndefinedValue.Instance;
}
Utils.CreateDataProperty(A, i.ToString(CultureInfo.InvariantCulture), capturedValue);
if (!string.IsNullOrEmpty(captureI.Name))
{
Utils.CreateDataProperty(groups, captureI.Name, capturedValue);
}
}
return(Completion.NormalCompletion(A));
}