public void Parse()
{
bool ignoreNext = false;
while (MoveNext())
{
if (ignoreNext)
{
_exactStart ??= _index;
ignoreNext = false;
continue;
}
switch (*_chars)
{
case '`': MaybeAddPendingExact(); ignoreNext = true; break;
case '*': MaybeAddPendingExact(); Steps.Add(WildcardInstruction.AnyAny); break;
case '?': MaybeAddPendingExact(); Steps.Add(WildcardInstruction.AnyOne); break;
case '[': ProcessAnyOf(); break;
default: _exactStart ??= _index; break;
}
}
if (_exactStart == null)
{
return;
}
Steps.Add(WildcardInstruction.Exact(_pattern.Slice(_exactStart.Value)));
_exactStart = null;
}
private void ProcessAnyOf()
{
MaybeAddPendingExact();
int start = _index;
int length = 0;
bool found = false;
bool isPartial = false;
while (MoveNext())
{
length++;
char current = *_chars;
if (current == '`')
{
isPartial = true;
if (length > 1)
{
Steps.Add(
WildcardInstruction.PartialAnyOf(
_pattern.Slice(
start + 1,
length - 1)));
}
// Skip trying to process the next character.
start = _index;
length = 1;
MoveNext();
continue;
}
if (current != ']')
{
continue;
}
found = true;
Steps.Add(
WildcardInstruction.AnyOf(
_pattern.Slice(
start + 1,
length - 1),
isPartial));
break;
}
if (!found)
{
throw Error.InvalidWildcardPattern(_pattern.ToString());
}
}
private void MaybeAddPendingExact()
{
if (_exactStart == null)
{
return;
}
Steps.Add(
WildcardInstruction.Exact(
_pattern.Slice(
_exactStart.Value,
_index - _exactStart.Value)));
_exactStart = null;
}