public InputStream Move(int shift)
{
var result = new InputStream(initialContent);
result.position = position + shift;
result.content = initialContent.Substring(result.position);
return result;
}
public ParsingResult Parse(string expression)
{
InputStream input = new InputStream(expression);
var tokens = grammar.Parse(input);
var filteredTokens = grammar.Filter(tokens);
var mixedTokens = grammar.ConvertToMixed(filteredTokens);
var ast = grammar.CreateAST(mixedTokens);
if (mixedTokens.Count != 1)
throw new ParserException("Wrong expression.");
var optimizedAst = ast.Optimize();
var result = new ParsingResult
{
Tree = optimizedAst,
ParameterNames = Parameters,
ParameterExpressions = grammar.ParameterExpressions.Values.ToArray()
};
return result;
}
public IEnumerable<LexicToken> Parse(InputStream input) {
textInfo.Clear();
parameterExpressions.Clear();
// sorting to prevent situation when parameter 'x1' is parsed as parameter 'x' when 'x' is available, too.
parameterReader.ParameterNames = parameters.OrderByDescending(s => s.Length);
namedConstantReader.Constants = NamedConstants;
functionReader.Functions = registeredFunctions;
List<LexicToken> tokens = new List<LexicToken>();
int start = 0;
do {
var copy = input;
foreach (var reader in lexicReaders) {
LexicToken token = null;
if (input.IsEmpty)
break;
start = input.Position;
input = reader.TryRead(input, out token);
if (token != null) {
TokenInTextInfo info = new TokenInTextInfo { StartIndex = start, Length = input.Position - start, Token = token };
textInfo.Add(info);
tokens.Add(token);
}
}
if (input == copy)
throw new ParserException(String.Format("Unexpected character '{0}' in position {1}.", input.Content[0], input.Position));
} while (!input.IsEmpty);
return tokens;
}