internal EcmaRegExp Clone()
{
EcmaRegExp clone = new EcmaRegExp(GetSpeciesConstructor(this, WellKnownObject.RegExpConstructor));
clone.Init(this);
return(clone);
}
public MatchResult(EcmaRegExp re, string input, Match result, Hashtable groupNameMap, int offset)
{
this.re = re;
this.Input = input;
this.result = result;
this.groupNameMap = groupNameMap;
this.stickyOffset = offset;
}
internal void Init(EcmaRegExp other)
{
this.nativeRegexp = other.nativeRegexp;
this.OriginalFlags = other.OriginalFlags;
this.captureGroups = other.captureGroups;
this.numericGroupCount = other.numericGroupCount;
this.Source = other.Source;
this.Flags = other.Flags;
}
internal EcmaRegExp Clone(bool global)
{
EcmaRegExp clone = Clone();
if (clone.Global != global)
{
clone.OriginalFlags ^= EcmaRegExpFlags.Global;
}
return(clone);
}
public static EcmaValue RegExpLiteral(string str)
{
Guard.ArgumentNotNull(str, "str");
if (str.Length == 0)
{
throw new ArgumentException("Literal cannot be empty", "str");
}
int lastPos = str.LastIndexOf('/');
if (str[0] != '/' || lastPos <= 1)
{
throw new ArgumentException("Invalid RegExp literal", "str");
}
return(EcmaRegExp.Parse(str.Substring(1, lastPos - 1), str.Substring(lastPos + 1)));
}
public MatchEvaluatorClass(EcmaRegExp re, string input, RuntimeObject replacement)
{
this.re = re;
this.input = input;
this.replacement = replacement;
}
public static EcmaRegExp Parse(string pattern, string flags)
{
Guard.ArgumentNotNull(pattern, "pattern");
Guard.ArgumentNotNull(flags, "flags");
string key = String.Concat("/", pattern, "/", flags);
if (!cache.TryGetValue(key, out EcmaRegExp re))
{
EcmaRegExpFlags options = 0;
string canonFlags = "";
canonFlags += AddFlag(flags, "g", EcmaRegExpFlags.Global, ref options);
canonFlags += AddFlag(flags, "i", EcmaRegExpFlags.IgnoreCase, ref options);
canonFlags += AddFlag(flags, "m", EcmaRegExpFlags.Multiline, ref options);
canonFlags += AddFlag(flags, "s", EcmaRegExpFlags.DotAll, ref options);
canonFlags += AddFlag(flags, "u", EcmaRegExpFlags.Unicode, ref options);
canonFlags += AddFlag(flags, "y", EcmaRegExpFlags.Sticky, ref options);
if (flags.Length != canonFlags.Length)
{
throw new EcmaSyntaxErrorException(InternalString.Error.InvalidRegexFlags);
}
string nPattern = pattern;
int numericGroupCount = 1;
List <string> captureGroups = new List <string> {
"0"
};
nPattern = reGroups.Replace(nPattern, m => {
switch (m.Value[0])
{
case '(':
// .NET has different ordering of numeric and named groups
// and also detect duplicated group names which are allowed in .NET
string name = m.Groups[2].Success ? m.Groups[2].Value : (numericGroupCount++).ToString();
if (captureGroups.Contains(name))
{
throw new EcmaSyntaxErrorException(InternalString.Error.RegExpDuplicatedNameGroup);
}
captureGroups.Add(name);
break;
case '\\':
// .NET consider having an invalid back reference (backref to capture at the right) as failure
if (m.Groups[1].Success && Int32.Parse(m.Groups[1].Value) >= captureGroups.Count)
{
return(String.Empty);
}
break;
}
return(m.Value);
});
bool unicode = (options & EcmaRegExpFlags.Unicode) != 0;
string allChars = unicode ? "(?:[\0-\uD7FF\uE000-\uFFFF]|[\uD800-\uDBFF][\uDC00-\uDFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])|(?<![\uD800-\uDBFF])[\uDC00-\uDFFF])" : "[\0-\uFFFF]";
string wildcardChars = (options & EcmaRegExpFlags.DotAll) != 0 ? allChars : unicode ? "(?:[\0-\t\x0B\f\x0E-\u2027\u202A-\uD7FF\uE000-\uFFFF]|[\uD800-\uDBFF][\uDC00-\uDFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])|(?<![\uD800-\uDBFF])[\uDC00-\uDFFF])" : "[\0-\t\x0B\f\x0E-\u2027\u202A-\uFFFF]";
// replace escape sequences that are not supported in ECMAScript but has semantic meaning in .NET
nPattern = (unicode ? reUnsupportedEscape : reUnsupportedEscapeNonUnicode).Replace(nPattern, "$1$1$2");
// convert character class \w, \W, \s, \S and wildcard to explicit character set
// and UnicodeEscape (\u{nnnnnn}) which is not supported in .NET
nPattern = reCharClass.Replace(nPattern, m => {
if (m.Value[0] == '\\')
{
switch (m.Value[1])
{
case 'w':
return("[a-zA-Z0-9_]");
case 'W':
return("[^a-zA-Z0-9_]");
case 's':
return("[\f\n\r\t\v\u2028\u2029\\p{Zs}]");
case 'S':
return("[^\f\n\r\t\v\u2028\u2029\\p{Zs}]");
case 'u':
return(ConvertUnicodeEscape(m.Value));
}
return(m.Value);
}
if (m.Value[0] == '.')
{
return(wildcardChars);
}
if (m.Groups[2].Captures.Count == 0)
{
// ECMAScript allows empty CharacterClass in pattern
// a negated empty CharacterClass means all code units or code points
if (m.Groups[1].Length != 0)
{
return(allChars);
}
return("(?!)");
}
StringBuilder sb = new StringBuilder();
sb.Append('[');
sb.Append(m.Groups[1].Value);
foreach (Capture c in m.Groups[2].Captures)
{
if (c.Value[0] == '\\')
{
switch (c.Value[1])
{
case 'w':
sb.Append("a-zA-Z0-9_");
continue;
case 'W':
sb.Append(unicode ? "\0-/:-@\\[-^`{-\uDBFF\uDFFF" : "\0-/:-@\\[-^`{-\uFFFF");
continue;
case 's':
sb.Append("\f\n\r\t\v\u2028\u2029\\p{Zs}");
continue;
case 'S':
sb.Append(unicode ? "\x00-\x08\x0E-\x19\x21-\x99\u00A1-\u1679\u1681-\u1FFF\u200B-\u2027\u202A-\u202E\u2030-\u205E\u2060-\u2FFF\u3001-\uDBFF\uDFFF" :
"\x00-\x08\x0E-\x19\x21-\x99\u00A1-\u1679\u1681-\u1FFF\u200B-\u2027\u202A-\u202E\u2030-\u205E\u2060-\u2FFF\u3001-\uFFFF");
continue;
case 'u':
sb.Append(ConvertUnicodeEscape(c.Value));
continue;
}
}
sb.Append(c.Value);
}
sb.Append(']');
return(sb.ToString());
});
// convert surrogate pairs (non-BMP character) and lone surrogates, and character class which contains such characters
// to appropriate pattern to correctly match code points
if (unicode && Regex.IsMatch(nPattern, "[\uD800-\uDFFF]"))
{
nPattern = reCodePoints.Replace(nPattern, m => {
if (m.Groups[1].Success)
{
return(TransformCharacterRange(m.Value, m.Groups[2].Value, m.Groups[1].Length > 0));
}
if (m.Groups[3].Success)
{
string chars = m.Groups[3].Value;
if (chars.Length == 1)
{
chars = Char.IsHighSurrogate(chars[0]) ? chars + "(?![\udc00-\udfff])" : "(?<![\ud800-\udbff])" + chars;
}
return(m.Groups[4].Success ? "(?:" + chars + ")" + m.Groups[4].Value : chars);
}
return(m.Value);
});
}
RegexOptions nOptions = RegexOptions.ECMAScript;
if ((options & EcmaRegExpFlags.IgnoreCase) != 0)
{
nOptions |= RegexOptions.IgnoreCase;
}
if ((options & EcmaRegExpFlags.Multiline) != 0)
{
nOptions |= RegexOptions.Multiline;
}
Regex nativeRegexp;
try {
nativeRegexp = new Regex(nPattern, nOptions);
} catch (ArgumentException) {
throw new EcmaSyntaxErrorException(InternalString.Error.InvalidRegex);
}
re = new EcmaRegExp(nativeRegexp, pattern, canonFlags, options, numericGroupCount, captureGroups.ToArray());
cache.TryAdd(key, re);
}
return((EcmaRegExp)re.Clone(RuntimeRealm.Current));
}
