private static void ScanDocCommentXmlString(LineProgress p)
{
while (!p.EndOfLine)
{
if (p.Char() == '"')
{
p.Advance(1);
p.State = State.DocCommentXml;
return; // Done with string in doc comment XML.
}
p.Advance();
}
// End of line. Never found the '"' to close the string, but whatever. We revert to default state.
p.State = State.Default;
}
private void ScanString(LineProgress p)
{
bool markText = !this.IgnoreNormalStrings;
if (markText)
{
p.StartNaturalText();
}
while (!p.EndOfLine)
{
if (p.Char() == '\\') // Escaped character. Skip over it.
{
p.Advance(2);
}
else if (p.Char() == '"') // End of string
{
if (markText)
{
p.EndNaturalText();
}
p.Advance();
p.State = State.Default;
return;
}
else
{
p.Advance();
}
}
// End of line. String wasn't closed. Oh well. Revert to Default state.
if (markText)
{
p.EndNaturalText();
}
p.State = State.Default;
}
private static void ScanCharacter(LineProgress p)
{
if (!p.EndOfLine && p.Char() == '\\') // escaped character. Eat it.
{
p.Advance(2);
}
else if (!p.EndOfLine && p.Char() != '\'') // non-escaped character. Eat it.
{
p.Advance(1);
}
if (!p.EndOfLine && p.Char() == '\'') // closing ' for character, as expected.
{
p.Advance(1);
p.State = State.Default;
return;
}
// Didn't find closing ' for character. Oh well.
p.State = State.Default;
}
private void ScanMultiLineString(LineProgress p)
{
bool markText = !this.IgnoreVerbatimStrings;
if (markText)
{
p.StartNaturalText();
}
while (!p.EndOfLine)
{
if (p.Char() == '"' && p.NextChar() == '"') // "" is allowed within multi-line string.
{
p.Advance(2);
}
else if (p.Char() == '"') // End of multi-line string
{
if (markText)
{
p.EndNaturalText();
}
p.Advance();
p.State = State.Default;
return;
}
else
{
p.Advance();
}
}
// End of line. Emit as human readable, but remain in MultiLineString state.
if (markText)
{
p.EndNaturalText();
}
Debug.Assert(p.State == State.MultiLineString);
}
private State ScanLine(State state, ITextSnapshotLine line, List <SnapshotSpan> naturalTextSpans = null)
{
LineProgress p = new LineProgress(line, state, naturalTextSpans);
while (!p.EndOfLine)
{
switch (p.State)
{
case State.Default:
ScanDefault(p);
break;
case State.MultiLineComment:
ScanMultiLineComment(p);
break;
case State.MultiLineDocComment:
ScanMultiLineDocComment(p);
break;
case State.MultiLineString:
ScanMultiLineString(p);
break;
default:
Debug.Fail("Invalid state at beginning of line.");
break;
}
}
// End Of Line state must be one of these.
Debug.Assert(p.State == State.Default || p.State == State.MultiLineString ||
p.State == State.MultiLineComment || p.State == State.MultiLineDocComment);
return(p.State);
}
private void ScanDefault(LineProgress p)
{
while (!p.EndOfLine)
{
if (p.Char() == '/' && p.NextChar() == '/' && p.NextNextChar() == '/') // Doc comment
{
p.Advance(3);
if (this.IgnoreXmlDocComments && (p.EndOfLine || p.Char() != '/'))
{
p.AdvanceToEndOfLine();
return;
}
if (this.IgnoreQuadrupleSlashComments && !p.EndOfLine && p.Char() == '/')
{
p.AdvanceToEndOfLine();
return;
}
p.State = State.DocComment;
ScanDocComment(p);
}
else if (p.Char() == '/' && p.NextChar() == '/') // Single line comment
{
p.Advance(2);
if (!this.IgnoreStandardSingleLineComments)
{
p.StartNaturalText();
p.AdvanceToEndOfLine();
p.EndNaturalText();
}
else
{
p.AdvanceToEndOfLine();
}
p.State = State.Default;
return;
}
else if (p.Char() == '/' && p.NextChar() == '*') // Multi-line comment or multi-line doc comment
{
p.Advance(2);
// "/***" is just a regular multi-line comment, not a doc comment
if (p.EndOfLine || p.Char() != '*' || p.NextChar() == '*')
{
p.State = State.MultiLineComment;
ScanMultiLineComment(p);
}
else
{
p.State = State.MultiLineDocComment;
ScanMultiLineDocComment(p);
}
}
else if (p.Char() == '@' && p.NextChar() == '"') // Verbatim string
{
p.Advance(2);
p.State = State.MultiLineString;
ScanMultiLineString(p);
}
else if (p.Char() == '"') // Single-line string
{
p.Advance(1);
p.State = State.String;
ScanString(p);
}
else if (p.Char() == '\'') // Character literal
{
p.Advance(1);
p.State = State.Character;
ScanCharacter(p);
}
else if (p.Char() == '#') // Possible preprocessor keyword, check for #region
{
p.Advance(1);
// If found, treat it like a single line comment
if (p.NextSegment(6) == "region")
{
p.StartNaturalText();
p.AdvanceToEndOfLine();
p.EndNaturalText();
p.State = State.Default;
return;
}
}
else
{
p.Advance();
}
}
}
