/// <summary>
/// Pushes a new char into the current state which calculates the new
/// indentation level.
/// </summary>
/// <param name="ch">
/// A new character.
/// </param>
public void Push(char ch)
{
CurrentState.Push(CurrentChar = ch);
if (!TextEditorOptions.EolMarker.Contains(ch))
{
IsLineStart &= char.IsWhiteSpace(ch);
if (IsLineStart)
{
CurrentIndent.Append(ch);
}
if (ch == '\t')
{
var nextTabStop = (column - 1 + TextEditorOptions.IndentSize) / TextEditorOptions.IndentSize;
column = 1 + nextTabStop * TextEditorOptions.IndentSize;
}
else
{
column++;
}
}
else
{
if (ch != NewLineChar)
{
// there can be more than one chars that determine the EOL,
// the engine uses only one of them defined with NewLineChar
return;
}
CurrentIndent.Length = 0;
IsLineStart = true;
column = 1;
line++;
}
offset++;
// ignore whitespace and newline chars
if (!char.IsWhiteSpace(CurrentChar) && !TextEditorOptions.EolMarker.Contains(CurrentChar))
{
PreviousChar = CurrentChar;
}
}
/// <inheritdoc />
public void Push(char ch)
{
// append this char to the wordbuf if it can form a valid keyword, otherwise check
// if the last sequence of chars form a valid keyword and reset the wordbuf.
if ((wordToken.Length == 0 ? char.IsLetter(ch) : char.IsLetterOrDigit(ch)) || ch == '_')
{
wordToken.Append(ch);
}
else if (wordToken.Length > 0)
{
currentState.CheckKeyword(wordToken.ToString());
previousKeyword = wordToken.ToString();
wordToken.Length = 0;
isLineStartBeforeWordToken = false;
}
var isNewLine = NewLine.IsNewLine(ch);
if (!isNewLine)
{
currentState.Push(currentChar = ch);
offset++;
previousNewline = '\0';
// ignore whitespace and newline chars
var isWhitespace = currentChar == ' ' || currentChar == '\t';
if (!isWhitespace)
{
previousChar = currentChar;
isLineStart = false;
}
if (isLineStart)
{
currentIndent.Append(ch);
}
if (ch == '\t')
{
var nextTabStop = (column - 1 + textEditorOptions.IndentSize) / textEditorOptions.IndentSize;
column = 1 + nextTabStop * textEditorOptions.IndentSize;
}
else
{
column++;
}
}
else
{
if (ch == NewLine.LF && previousNewline == NewLine.CR)
{
offset++;
return;
}
currentState.Push(currentChar = newLineChar);
offset++;
previousNewline = ch;
// there can be more than one chars that determine the EOL,
// the engine uses only one of them defined with newLineChar
if (currentChar != newLineChar)
{
return;
}
currentIndent.Length = 0;
isLineStart = true;
isLineStartBeforeWordToken = true;
column = 1;
line++;
lineBeganInsideMultiLineComment = IsInsideMultiLineComment;
lineBeganInsideVerbatimString = IsInsideVerbatimString;
}
}