private void UpdateSymbolsAfterRuleRemoved( RuleStrRep rule, ref bool grammaticals_changed, ref bool terminals_changed )
{
// LeftHandSide
if( this.grammaticals[rule.Lhs] <= 1 )
{
this.grammaticals.Remove(rule.Lhs);
grammaticals_changed = true;
if( this.terminals.ContainsKey(rule.Lhs) )
terminals_changed = true;
}
else
{
this.grammaticals[rule.Lhs] -= 1;
}
// RightHandSide
for( int i = 0; i < rule.Rhs.Count; ++i )
{
string symbol = rule.Rhs[i];
if( this.terminals[symbol] <= 1 )
{
this.terminals.Remove(symbol);
terminals_changed = true;
}
else
{
this.terminals[symbol] -= 1;
}
}
}
private RuleStrRep ParseRule( string str )
{
var new_rule = new RuleStrRep();
new_rule.Lhs = str.Substring(0, 1);
for( int i = 3; i < str.Length; ++i )
new_rule.Rhs.Add(str.Substring(i, 1));
return new_rule;
}
private void UpdateSymbolsAfterRuleAdded( RuleStrRep rule, ref bool grammaticals_changed, ref bool terminals_changed )
{
// LeftHandSide is a grammatical.
if( this.grammaticals.ContainsKey(rule.Lhs) )
{
this.grammaticals[rule.Lhs] += 1;
}
else
{
this.grammaticals.Add(rule.Lhs, 1);
grammaticals_changed = true;
if( this.terminals.ContainsKey(rule.Lhs) )
terminals_changed = true;
}
// Count all RightHandSide symbols as terminals.
for( int i = 0; i < rule.Rhs.Count; ++i )
{
string symbol = rule.Rhs[i];
if( this.terminals.ContainsKey(symbol) )
{
this.terminals[symbol] += 1;
}
else
{
this.terminals.Add(symbol, 1);
terminals_changed = true;
}
}
}
private void LoadGrammar( Grammar grammar )
{
this.terminals.Clear();
this.grammaticals.Clear();
this.rules.Clear();
try
{
// Check symbol names
foreach( var tr in grammar.Terminals )
if( tr.Name.Length != 1 )
throw new ArgumentException(string.Format("Terminal's name '{0}' is not simple.", tr.Name));
foreach( var gr in grammar.Grammaticals )
if( gr.Name.Length != 1 && gr.Name != "S'" )
throw new ArgumentException(string.Format("Grammatical's name '{0}' is not simple.", gr.Name));
foreach( var rule in grammar.Rules )
{
var rule_rep = new RuleStrRep();
rule_rep.Lhs = rule.LeftHandSide.Name;
if( this.grammaticals.ContainsKey(rule.LeftHandSide.Name) )
this.grammaticals[rule.LeftHandSide.Name] += 1;
else
this.grammaticals[rule.LeftHandSide.Name] = 1;
foreach( var symbol in rule.RightHandSide )
{
rule_rep.Rhs.Add(symbol.Name);
if( symbol is GrammaticalSymbol )
{
if( this.grammaticals.ContainsKey(symbol.Name) )
this.grammaticals[symbol.Name] += 1;
else
this.grammaticals[symbol.Name] = 1;
}
else
{
if( this.terminals.ContainsKey(symbol.Name) )
this.terminals[symbol.Name] += 1;
else
this.terminals[symbol.Name] = 1;
}
}
this.rules.Add(rule_rep);
}
}
finally
{
// Update gui
this.UpdateRulesList();
this.UpdateGrammaticals();
this.UpdateTerminals();
}
}