internal static void DetermineSentenceType(Sentence sentence)
{
foreach (var currentSentence in sentence.After)
{
var isBlank = !currentSentence.Tokens.Any();
if (isBlank)
{
currentSentence.Type = SentenceType.Blank;
continue;
}
var sentenceDefinitionMatch =
(from sentenceDefinition in Grammar.SentenceDefinitions
from tokens in sentenceDefinition.AllowedTokenTypes
// compare tokens with token patterns to identify the type of sentence
where tokens.SequenceEqual(currentSentence.Tokens.Select(t => t.Type))
select sentenceDefinition).SingleOrDefault();
var foundMatch = sentenceDefinitionMatch != null;
if (!foundMatch)
{
currentSentence.Type = SentenceType.Invalid;
continue;
}
// update sentence type
currentSentence.Type = sentenceDefinitionMatch.SentenceType;
// update token types to exact types
var exactTokenTypes = sentenceDefinitionMatch.ExactTokenTypes;
for (var i = 0; i < sentenceDefinitionMatch.ExactTokenTypes.Length; i++)
{
var exactTokenType = exactTokenTypes[i];
var containsToken = i < currentSentence.Tokens.Count;
if (containsToken)
{
currentSentence.Tokens[i].Type = exactTokenType;
}
// found less tokens then actually required so add the missing one
else
{
var newToken = new Token(string.Empty)
{
Type = exactTokenTypes[i],
Sentence = currentSentence,
FromColumn = currentSentence.Tokens.Last().ToColumn + 1
};
currentSentence.Tokens.Add(newToken);
}
}
}
}
internal static List<Token> TokenizeLine(string line, DelimiterDictionary delimiters)
{
var isEmptyLine = string.IsNullOrWhiteSpace(line);
if (isEmptyLine)
{
return new List<Token>();
}
// initialize tokens with start-of-line
var delimiterTokens = new List<Token>
{
new Token(Grammar.Space)
{
Type = TokenType.StartOfLine,
}
};
// determine delimiter tokens
for (var i = 0; i < line.Length; i++)
{
var c = line[i];
TokenType tokenType;
var isDelimiterToken = delimiters.Delimiters.TryGetValue(c, out tokenType);
if (!isDelimiterToken)
{
continue;
}
var isEscapedToken = Grammar.EscapableTokens.Contains(tokenType) && i > 0 && line[i - 1] == Grammar.Backslash;
if (isEscapedToken)
{
continue;
}
var isInlineCommentIndicator = tokenType == TokenType.CommentIndicator && i > 0;
if (isInlineCommentIndicator)
{
continue;
}
// ignore inline section delimiters
var isInlineLeftSectionDelimiter = tokenType == TokenType.LeftSectionDelimiter && i > 0;
var isInlineRightSectionDelimiter = tokenType == TokenType.RightSectionDelimiter && i <= line.Length - 1 && delimiterTokens.Skip(1).FirstOrDefault()?.Type != TokenType.LeftSectionDelimiter;
var ignoreInlineSectionDelimiter = isInlineLeftSectionDelimiter || isInlineRightSectionDelimiter;
if (ignoreInlineSectionDelimiter)
{
continue;
}
// ignore property/value delimiter if first or already found
var startsWithPropertyValueDelimiter = tokenType == TokenType.ProperetyValueDelimiter && i == 0;
var containsPropertyValueDelimiter = delimiterTokens.Any(t => t.Type == TokenType.ProperetyValueDelimiter);
var ignorePropertyValueDelimiter = startsWithPropertyValueDelimiter || containsPropertyValueDelimiter;
if (ignorePropertyValueDelimiter)
{
continue;
}
// collect token
var token = new Token(c)
{
FromColumn = i,
Type = tokenType
};
delimiterTokens.Add(token);
}
// add end-of-line token
delimiterTokens.Add(new Token(Grammar.Space)
{
Type = TokenType.EndOfLine,
FromColumn = line.Length
});
var lineTokens = CollectText(line, delimiterTokens);
return lineTokens;
}
private static List<Token> CollectText(string line, List<Token> delimiterTokens)
{
var previousToken = delimiterTokens.First();
var allTokens = new List<Token>();
foreach (var currentToken in delimiterTokens)
{
// calc the position and length of the text between delimiter tokens
var previousColumn = previousToken.FromColumn;
var previousLength = previousToken.Length;
var currentColumn = currentToken.FromColumn;
var startIndex = previousColumn + previousLength;
var textLength = currentColumn - (previousColumn + previousLength);
if (textLength == 0 && currentToken.Type != TokenType.EndOfLine)
{
allTokens.Add(currentToken);
}
if (textLength > 0)
{
var text = line.Substring(startIndex, textLength);
var textToken = new Token(text)
{
Type = TokenType.Text,
FromColumn = currentColumn
};
allTokens.Add(textToken);
if (currentToken.Type != TokenType.EndOfLine)
{
allTokens.Add(currentToken);
}
}
previousToken = currentToken;
}
return allTokens;
}
protected bool Equals(Token other) => string.Equals(_token, other._token);