public Grammar ReadGrammar()
{
try
{
var grammar = new Grammar();
_reader = new StreamReader(_filePath);
grammar.SetNotTerminals(ReadNotTerminals());
grammar.SetTerminals(ReadTerminals());
grammar.SetRules(ReadRules(grammar));
grammar.SetStart(ReadStart());
_reader.Close();
return grammar;
}
catch (Exception e)
{
return null;
}
}
private Rule CreateRule(Grammar grammar, string str)
{
Rule rule = null;
string res = "";
bool flag = false;
foreach (var c in str)
{
if (c != ' ')
res += c;
else
{
if (!flag)
{
rule = new Rule(new NotTerminal(res));
flag = true;
}
else
rule.AddRightPart(grammar.GetSymbol(res));
res = "";
}
}
rule.AddRightPart(grammar.GetSymbol(res));
return rule;
}
private List<Rule> ReadRules(Grammar grammar)
{
var rules = new List<Rule>();
int count = int.Parse(_reader.ReadLine());
for (int i = 0; i < count; i++)
{
string str = _reader.ReadLine();
rules.Add(CreateRule(grammar, str));
}
return rules;
}
public LexicalAnalyzer(Grammar grammar, string output)
{
_grammar = grammar;
_output = output;
}