/// <summary>
/// Updates the state of the parser by processing the specified token.
/// State is updated based on contents of token (e.g. verse change), but position
/// is the beginning of token, not the end.
/// </summary>
/// <param name="tokens">list of all tokens being processed</param>
/// <param name="index">index of the token to be processed</param>
/// <param name="tokensPreserveWhitespace">True if the tokens were created while preserving whitespace,
/// false otherwise</param>
public void UpdateState(List <UsfmToken> tokens, int index, bool tokensPreserveWhitespace = false)
{
if (this.tokens != null && this.tokens != tokens)
{
parser = null; // Reset parser
}
this.tokens = tokens;
this.preserveWhitespace = tokensPreserveWhitespace;
// Create parser if not done already
if (parser == null)
{
parser = new UsfmParser(ScrStylesheet, tokens, this, new ScrParserUsfmParserSink(this), tokensPreserveWhitespace);
}
// Check that token to process is next token
if (index != parser.Index + 1)
{
throw new ArgumentException("Tokens must be processed sequentially");
}
// Reset paraStart and cellStart
ParaStart = false;
CellStart = false;
parser.ProcessToken();
}
private static void LookaheadParser(UsfmParserState state, UsfmParser lookaheadParser, string marker, out bool isTokenClosed)
{
// BEWARE: This method is fairly performance-critical
// Determine current marker
string endMarker = marker + "*";
// Process tokens until either the start of the stack doesn't match (it was closed
// improperly) or a matching close marker is found
while (lookaheadParser.ProcessToken())
{
UsfmToken currentToken = lookaheadParser.tokens[lookaheadParser.index];
// Check if same marker was reopened without a close
bool reopened = currentToken.Marker == marker &&
lookaheadParser.State.Stack.SequenceEqual(state.Stack);
if (reopened)
{
isTokenClosed = false;
return;
}
// Check if beginning of stack is unchanged. If token is unclosed, it will be unchanged
bool markerStillOpen = lookaheadParser.State.Stack.Take(state.Stack.Count).SequenceEqual(state.Stack);
if (!markerStillOpen)
{
// Record whether marker is an end for this marker
isTokenClosed = currentToken.Marker == endMarker && currentToken.Type == UsfmTokenType.End;
return;
}
}
isTokenClosed = false;
}
/// <summary>
/// Determines if the current token is closed by a matching end marker
/// </summary>
/// <returns></returns>
bool IsTokenClosed()
{
// Clone current parser
if (tokenClosedParser == null)
{
tokenClosedParser = new UsfmParser(this);
}
tokenClosedParser.UpdateParser(this);
bool isTokenClosed;
string marker = tokens[index].Marker;
LookaheadParser(State, tokenClosedParser, marker, out isTokenClosed);
return(isTokenClosed);
}
private bool CheckInternal(List <UsfmToken> tokens, int bookNum, ScrStylesheet scrStylesheet)
{
VerseRef startVerse = new VerseRef(bookNum, 1, 0, ScrVers.English);
if (tokens.Count > 0 && tokens[0].Marker != "id")
{
RecordError(startVerse, "", 0, "#" + missingIdMarker);
}
MarkerCheckSink markerCheckSink = new MarkerCheckSink(scrStylesheet, startVerse.Book, this);
UsfmParser parser = new UsfmParser(scrStylesheet, tokens, startVerse, markerCheckSink);
parser.ProcessTokens();
markerCheckSink.ReportPendingVerseNoParaError();
markerCheckSink.ReportOpenMilestoneErrors();
return(markerErrors || markerCheckSink.MarkerErrors);
}
/// <summary>
/// Updates the state of this parser to be the same as the state of the specified parser.
/// </summary>
internal void UpdateParser(UsfmParser usfmParser)
{
state = usfmParser.State.Clone();
index = usfmParser.index;
skip = 0;
}
/// <summary>
/// Constructor for making a duplicate for looking ahead to find closing
/// tokens of notes and character styles.
/// </summary>
UsfmParser(UsfmParser usfmParser, UsfmParserSink sink = null)
{
scrStylesheet = usfmParser.scrStylesheet;
tokens = usfmParser.tokens;
this.sink = sink;
}
