internal override void BuildResult(Scanner s, out MatchResult result, Match m)
{
this.NewMatchResult(out result);
this.m_pattern.BuildMatchResult(m, s.Reader.PosCurrent, s.PosWindowStart, ref result);
SetPositionsInResult(ref result);
return;
}
private void Match(Scanner s, int idxPosition, Regex r, ref MatchResult result)
{
int idxMatchAt = idxPosition;
if (this.LeadingContext > 0) {
idxMatchAt -= this.LeadingContext;
// SHOULD: idxMatchAt = Math.Min(idxMatchAt, s.GetIdxLineStartFor(s.m_idxMatchHead));
idxMatchAt = Math.Max(0, idxMatchAt);
}
Match m = r.Match(s.InputWindow.Window, idxMatchAt - s.PosWindowStart);
if (m.Success) {
this.BuildMatchResult(m, idxMatchAt, s.PosWindowStart, ref result);
} else {
result.Success = false;
}
}
internal void Match(Scanner s, int idxPosition, string[] externalCaptures, ref MatchResult result)
{
if (null == externalCaptures || externalCaptures.Length == 0) {
this.Match(s, idxPosition, this.CachedRegex, ref result);
return;
}
StringBuilder regexBuilder = new StringBuilder(this.RawRegex);
int idxLastUsableCapture = Math.Min(externalCaptures.Length, this.LastExternalMatch);
for (int i = 1; i <= idxLastUsableCapture; i++) {
regexBuilder.Replace(StringExtensions.Fi("\\z{0}", i), externalCaptures[i - 1]);
}
Regex r = this.InstantiateRegex(regexBuilder.ToString(), false);
this.Match(s, idxPosition, r, ref result);
}
internal void Match(Scanner s, int idxPosition, ref MatchResult result)
{
if (0 < this.LastExternalMatch) {
string msg = StringExtensions.Fi("Invalid call to Match(): no external captures were passed, but Pattern '{0}' expects them", this);
throw new InvalidOperationException(msg);
}
this.Match(s, idxPosition, this.CachedRegex, ref result);
}
private bool TryFindEndWithinLine(Scanner s, int posStartAt, string[] externalCaptures)
{
MatchResult result = new MatchResult();
int position = posStartAt;
while (position <= s.PosWindowEnd) {
result.MatchType = MatchType.RegionSkip;
for (int i = 0; i < this.m_skipPatterns.Count; i++) {
this.m_skipPatterns[i].Match(s, position, externalCaptures, ref result);
if (result.Success) {
while (position < result.PosAfterMatch) {
position++;
if ('\n' == s.InputWindow[position]) {
return false;
}
}
break;
}
}
for (int i = 0; i < this.m_endPatterns.Count; i++) {
this.m_endPatterns[i].Match(s, position, externalCaptures, ref result);
if (result.Success) {
return true;
}
}
if ('\n' == s.InputWindow[position]) {
return false;
}
position++;
}
return false;
}
internal bool TrySkips(Scanner s, Scope scope, int posMatchAt)
{
if (posMatchAt <= scope.PosEndSkippedUntil || scope.PosAfter != int.MaxValue) {
return false;
}
MatchResult result = new MatchResult();
result.MatchType = MatchType.RegionSkip;
for (int i = 0; i < this.m_skipPatterns.Count; i++) {
this.m_skipPatterns[i].Match(s, posMatchAt, scope.ExternalCaptures, ref result);
if (result.Success) {
if (result.PosAfterMatch <= s.PosWindowEnd) {
if ('\n' == s[result.PosAfterMatch]) {
result.PosAfterMatch++;
}
}
scope.PosEndSkippedUntil = result.PosAfterMatch - 1;
return true;
}
}
return false;
}
internal override MatchResult TryMatch(Scanner s)
{
MatchResult result;
this.NewMatchResult(out result);
for (int i = 0; i < this.m_startPatterns.Count; i++) {
Pattern p = this.m_startPatterns[i];
p.Match(s, s.Reader.PosCurrent, ref result);
if (!result.Success) {
continue;
}
result.Pattern = p;
if (this.IsOneLine) {
bool foundEndWithinLine = TryFindEndWithinLine(s, result.PosAfterMatch, result.ExternalCaptures);
if (!foundEndWithinLine) {
// MAY: so we found a region start and then didn't find the end in the current line, and are now giving up on the region.
// IN THEORY, we could try to keep matching other START patterns because we could for example have a different start pattern
// that is, say, shorter, and for which the region end would match in this line. In practice, this works.
break;
}
}
return result;
}
result.Success = false;
return result;
}
internal bool TryEnding(Scanner s, Scope scope)
{
int posMatchAt = s.Reader.PosCurrent;
if (posMatchAt <= scope.PosEndSkippedUntil || scope.PosAfter != int.MaxValue) {
return false;
}
if (this.TrySkips(s, scope, posMatchAt)) {
return false;
}
MatchResult result = new MatchResult();
result.MatchType = MatchType.RegionEnd;
for (int i = 0; i < this.m_endPatterns.Count; i++) {
this.m_endPatterns[i].Match(s, posMatchAt, scope.ExternalCaptures, ref result);
if (result.Success) {
scope.PosAfter = result.PosAfterMatch;
bool hasHighlightMode = this.m_endPatterns[i].HasHighlightMode;
if (0 == result.PosAfterRegion && hasHighlightMode) {
result.PosAfterRegion = result.PosMatchStart;
}
if (0 == result.PosAfterHighlight) {
result.PosAfterHighlight = result.PosAfterMatch;
}
if (hasHighlightMode && result.PosAfterRegion < result.PosAfterHighlight) {
s.SendMode(this.m_endPatterns[i].HighlightMode, result.PosAfterRegion);
}
if (result.PosAfterHighlight < result.PosAfterMatch) {
s.BuildHighlightModes(result.PosAfterHighlight);
}
return true;
}
}
return false;
}
internal override void StartScopeForSuccesfulMatch(Scanner s, MatchResult match)
{
Scope newScope = this.BuildNewScope(s.TopScope);
newScope.PosMatchedAt = match.PosMatchedAt;
newScope.ExternalCaptures = match.ExternalCaptures;
bool hasHighlightMode = match.Pattern.HasHighlightMode;
if (0 == match.PosRegionStart) {
match.PosRegionStart = hasHighlightMode ? match.PosAfterMatch : match.PosMatchStart;
}
if (0 == match.PosHighlightStart) {
match.PosHighlightStart = match.PosMatchStart;
}
if (hasHighlightMode && match.PosHighlightStart < match.PosRegionStart) {
s.SendMode(match.Pattern.HighlightMode, match.PosHighlightStart);
}
newScope.PosStart = hasHighlightMode ? match.PosRegionStart : match.PosMatchStart;
newScope.PosHighlightStart = hasHighlightMode ? match.PosRegionStart : match.PosHighlightStart;
newScope.PosEndSkippedUntil = hasHighlightMode ? match.PosRegionStart - 1 : match.PosAfterMatch - 1;
newScope.EatNewLineInRegion = match.Pattern.EatNewLine;
s.PushScope(newScope);
}
internal override void BuildResult(Scanner s, out MatchResult result, Match m)
{
if (this.IsOneLine) {
result = this.TryMatch(s);
return;
}
this.NewMatchResult(out result);
for (int i = 0; i < this.m_startPatterns.Count; i++) {
if (m.Groups["s" + i].Success) {
result.Pattern = this.m_startPatterns[i];
this.m_startPatterns[i].BuildMatchResult(m, s.Reader.PosCurrent, s.PosWindowStart, ref result);
return;
}
}
string msg = StringExtensions.Fi("Unable to find pattern that matched for region '{0}'", this);
throw new AssertionViolationException(msg);
}
internal abstract void BuildResult(Scanner s, out MatchResult result, Match m);
internal abstract MatchResult TryMatch(Scanner s);
internal abstract void StartScopeForSuccesfulMatch(Scanner s, MatchResult match);
internal override void StartScopeForSuccesfulMatch(Scanner s, MatchResult match)
{
Scope newScope = this.BuildNewScope(match, s.TopScope);
s.PushScope(newScope);
return;
}
internal override MatchResult TryMatch(Scanner s)
{
MatchResult result;
this.NewMatchResult(out result);
this.Pattern.Match(s, s.Reader.PosCurrent, ref result);
SetPositionsInResult(ref result);
return result;
}