public override IScriptable Construct(Context cx, IScriptable scope, object [] args)
{
BuiltinRegExp re = new BuiltinRegExp();
re.compile(cx, scope, args);
ScriptRuntime.setObjectProtoAndParent(re, scope);
return(re);
}
private static SubString interpretDollar(Context cx, RegExpImpl res, string da, int dp, int [] skip)
{
char dc;
int num, tmp;
if (da [dp] != '$')
{
Context.CodeBug();
}
/* Allow a real backslash (literal "\\") to escape "$1" etc. */
Context.Versions version = cx.Version;
if (version != Context.Versions.Default && version <= Context.Versions.JS1_4)
{
if (dp > 0 && da [dp - 1] == '\\')
{
return(null);
}
}
int daL = da.Length;
if (dp + 1 >= daL)
{
return(null);
}
/* Interpret all Perl match-induced dollar variables. */
dc = da [dp + 1];
if (BuiltinRegExp.isDigit(dc))
{
int cp;
if (version != Context.Versions.Default && version <= Context.Versions.JS1_4)
{
if (dc == '0')
{
return(null);
}
/* Check for overflow to avoid gobbling arbitrary decimal digits. */
num = 0;
cp = dp;
while (++cp < daL && BuiltinRegExp.isDigit(dc = da [cp]))
{
tmp = 10 * num + (dc - '0');
if (tmp < num)
{
break;
}
num = tmp;
}
}
else
{
/* ECMA 3, 1-9 or 01-99 */
int parenCount = (res.parens == null) ? 0 : res.parens.Length;
num = dc - '0';
if (num > parenCount)
{
return(null);
}
cp = dp + 2;
if ((dp + 2) < daL)
{
dc = da [dp + 2];
if (BuiltinRegExp.isDigit(dc))
{
tmp = 10 * num + (dc - '0');
if (tmp <= parenCount)
{
cp++;
num = tmp;
}
}
}
if (num == 0)
{
return(null); /* $0 or $00 is not valid */
}
}
/* Adjust num from 1 $n-origin to 0 array-index-origin. */
num--;
skip [0] = cp - dp;
return(res.getParenSubString(num));
}
skip [0] = 2;
switch (dc)
{
case '$':
return(new SubString("$"));
case '&':
return(res.lastMatch);
case '+':
return(res.lastParen);
case '`':
if (version == Context.Versions.JS1_2)
{
/*
* JS1.2 imitated the Perl4 bug where left context at each step
* in an iterative use of a global regexp started from last match,
* not from the start of the target string. But Perl4 does start
* $` at the beginning of the target string when it is used in a
* substitution, so we emulate that special case here.
*/
res.leftContext.index = 0;
res.leftContext.length = res.lastMatch.index;
}
return(res.leftContext);
case '\'':
return(res.rightContext);
}
return(null);
}
public virtual int FindSplit(Context cx, IScriptable scope, string target, string separator, IScriptable reObj, int [] ip, int [] matchlen, bool [] matched, string [] [] parensp)
{
int i = ip [0];
int length = target.Length;
int result;
Context.Versions version = cx.Version;
BuiltinRegExp re = (BuiltinRegExp)reObj;
while (true)
{
// imitating C label
/* JS1.2 deviated from Perl by never matching at end of string. */
int ipsave = ip [0]; // reuse ip to save object creation
ip [0] = i;
object ret = re.executeRegExp(cx, scope, this, target, ip, BuiltinRegExp.TEST);
if (ret == null || !ret.Equals(true))
{
// Mismatch: ensure our caller advances i past end of string.
ip [0] = ipsave;
matchlen [0] = 1;
matched [0] = false;
return(length);
}
i = ip [0];
ip [0] = ipsave;
matched [0] = true;
SubString sep = this.lastMatch;
matchlen [0] = sep.length;
if (matchlen [0] == 0)
{
/*
* Empty string match: never split on an empty
* match at the start of a find_split cycle. Same
* rule as for an empty global match in
* match_or_replace.
*/
if (i == ip [0])
{
/*
* "Bump-along" to avoid sticking at an empty
* match, but don't bump past end of string --
* our caller must do that by adding
* sep->length to our return value.
*/
if (i == length)
{
if (version == Context.Versions.JS1_2)
{
matchlen [0] = 1;
result = i;
}
else
{
result = -1;
}
break;
}
i++;
goto again; // imitating C goto
}
}
// PR_ASSERT((size_t)i >= sep->length);
result = i - matchlen [0];
break;
again:
;
}
int size = (parens == null) ? 0 : parens.Length;
parensp [0] = new string [size];
for (int num = 0; num < size; num++)
{
SubString parsub = getParenSubString(num);
parensp [0] [num] = parsub.ToString();
}
return(result);
}
public virtual object Compile(Context cx, string source, string flags)
{
return(BuiltinRegExp.compileRE(source, flags, false));
}
/// <summary> Analog of C match_or_replace.</summary>
private static object matchOrReplace(Context cx, IScriptable scope, IScriptable thisObj, object [] args, RegExpImpl reImpl, GlobData data, bool forceFlat)
{
BuiltinRegExp re;
string str = ScriptConvert.ToString(thisObj);
data.str = str;
IScriptable topScope = ScriptableObject.GetTopLevelScope(scope);
if (args.Length == 0)
{
object compiled = BuiltinRegExp.compileRE("", "", false);
re = new BuiltinRegExp(topScope, compiled);
}
else if (args [0] is BuiltinRegExp)
{
re = (BuiltinRegExp)args [0];
}
else
{
string src = ScriptConvert.ToString(args [0]);
string opt;
if (data.optarg < args.Length)
{
args [0] = src;
opt = ScriptConvert.ToString(args [data.optarg]);
}
else
{
opt = null;
}
object compiled = BuiltinRegExp.compileRE(src, opt, forceFlat);
re = new BuiltinRegExp(topScope, compiled);
}
data.regexp = re;
data.global = (re.Flags & BuiltinRegExp.JSREG_GLOB) != 0;
int [] indexp = new int [] { 0 };
object result = null;
if (data.mode == EcmaScript.NET.RegExpActions.Search)
{
result = re.executeRegExp(cx, scope, reImpl, str, indexp, BuiltinRegExp.TEST);
if (result != null && result.Equals(true))
{
result = (int)reImpl.leftContext.length;
}
else
{
result = -1;
}
}
else if (data.global)
{
re.lastIndex = 0;
for (int count = 0; indexp [0] <= str.Length; count++)
{
result = re.executeRegExp(cx, scope, reImpl, str, indexp, BuiltinRegExp.TEST);
if (result == null || !result.Equals(true))
{
break;
}
if (data.mode == EcmaScript.NET.RegExpActions.Match)
{
match_glob(data, cx, scope, count, reImpl);
}
else
{
if (data.mode != EcmaScript.NET.RegExpActions.Replace)
{
Context.CodeBug();
}
SubString lastMatch = reImpl.lastMatch;
int leftIndex = data.leftIndex;
int leftlen = lastMatch.index - leftIndex;
data.leftIndex = lastMatch.index + lastMatch.length;
replace_glob(data, cx, scope, reImpl, leftIndex, leftlen);
}
if (reImpl.lastMatch.length == 0)
{
if (indexp [0] == str.Length)
{
break;
}
indexp [0]++;
}
}
}
else
{
result = re.executeRegExp(cx, scope, reImpl, str, indexp, ((data.mode == EcmaScript.NET.RegExpActions.Replace) ? BuiltinRegExp.TEST : BuiltinRegExp.MATCH));
}
return(result);
}
