static internal void UpdateLastMatch(Match md, string input)
{
GroupCollection groups = md.Groups;
int n = groups.Count - 1;
string left_context = Convert.ToString(input).Substring(0, md.Index);
string right_context = Convert.ToString(input).Substring(md.Index + md.Length);
Ctr._lastmatch = md;
Ctr.GetField("$_").SetValue("$_", input);
Ctr.GetField("$&").SetValue("$&", md.Value);
Ctr.GetField("$+").SetValue("$+", n > 0 ? groups [n].Value : "");
Ctr.GetField("$`").SetValue("$`", left_context);
Ctr.GetField("$'").SetValue("$'", right_context);
}
internal void Initialize(string pattern, bool ignoreCase, bool global, bool multiLine)
{
RegExpConstructor ctr = RegExpConstructor.Ctr;
_source = pattern;
_ignoreCase = ignoreCase;
_global = global;
_multiline = multiLine || Convert.ToBoolean(ctr.GetField("$*").GetValue("$*"));
RegexOptions options = RegexOptions.ECMAScript | RegexOptions.Compiled;
if (ignoreCase)
{
options |= RegexOptions.IgnoreCase;
}
if (_multiline)
{
options |= RegexOptions.Multiline;
}
try {
regex = new Regex(source, options);
} catch (ArgumentException err) {
throw new JScriptException(JSError.RegExpSyntax, err.Message);
}
}
public static object exec(object thisObj, object input)
{
RegExpObject re = Convert.ToRegExp(thisObj);
string str = null;
if (input == null)
{
RegExpConstructor ctr = RegExpConstructor.Ctr;
str = Convert.ToString(ctr.GetField("$_").GetValue("$_"));
}
else
{
str = Convert.ToString(input);
}
bool global = re.global;
int lastIndex = global ? (int)((double)re.lastIndex) : 0;
bool success = lastIndex >= 0 && lastIndex <= str.Length;
Match md = null;
if (success)
{
md = re.regex.Match(str, lastIndex);
success = md.Success;
}
if (!success)
{
re.lastIndex = 0;
return(DBNull.Value);
}
int index = md.Index;
int endIndex = index + md.Length;
if (global)
{
re.lastIndex = endIndex;
}
RegExpConstructor.UpdateLastMatch(md, str);
GroupCollection caps = md.Groups;
uint len = (uint)caps.Count;
RegExpMatch result = new RegExpMatch();
result.AddField("index", index);
result.AddField("input", input);
result.length = len;
for (uint j = 0; j < len; j++)
{
result.elems [j] = caps [(int)j].Value;
}
return(result);
}
