public static List<Token> ParseTokens(String expression) {
var variable = new Regex(@"^\s*([a-zA-Z.]+)");
var operation = new Regex(@"^\s*(&&|\|\||!=|==|<=|>=|!|<|>)");
var bracket = new Regex(@"^\s*([\(\)]+)");
var constant = new Regex(@"^\s*([0-9]*\.?[0-9]+)");
List<Token> result = new List<Token>();
String rest = expression;
Match match = null;
while (rest.Length > 0) {
match = variable.Match(rest);
if (match.Success) {
var text = match.Groups[0].Value.Trim();
Token token = new Variable {
Text = text
};
result.Add(token);
rest = CutOutOccurence(rest, text);
continue;
}
match = operation.Match(rest);
if (match.Success) {
var text = match.Groups[0].Value.Trim();
if (!Operators.ContainsKey(text)) {
UnityEngine.Debug.LogError("Неизвестный оператор " + text);
return null;
}
var op = Operators[text];
Token token = new Operator {
Text = text,
Type = op.Type,
NumArgs = op.NumArgs,
Priority = op.Priority
};
result.Add(token);
rest = CutOutOccurence(rest, text);
continue;
}
match = bracket.Match(rest);
if (match.Success) {
var text = match.Groups[0].Value.Trim();
if (!BracketTypes.ContainsKey(text)) {
UnityEngine.Debug.LogError("Неизвестный символ " + text);
return null;
}
var type = BracketTypes[text];
Token token = new Bracket {
Text = text,
Type = type
};
result.Add(token);
rest = CutOutOccurence(rest, text);
continue;
}
match = constant.Match(rest);
if (match.Success) {
var text = match.Groups[0].Value.Trim();
float value = Convert.ToSingle(text);
Token token = new Contant {
Text = text,
Value = (int)value
};
result.Add(token);
rest = CutOutOccurence(rest, text);
continue;
}
Debug.LogError("Ошибка распознавания токенов в строке " + rest);
return null;
}
return result;
}
