public static GATNode _factor(this LL1Processor ll1)
{
var node = new GATNode();
var offset = 0;
switch (WordContainer.GetWordType(offset))
{
case WordType.BRACKET_L:
{
WordContainer.Advance(WordType.BRACKET_L);
var expression = ll1._expression();
node.AddChild(expression);
node.generator = Factor1;
WordContainer.Advance(WordType.BRACKET_R);
break;
}
case WordType.ID:
{
offset = 1;
if (WordContainer.GetWordType(offset) == WordType.BRACKET_L)
{
var CALL = ll1._call();
node.AddChild(CALL);
node.generator = Factor2;
}
else
{
var VAR = ll1._var();
node.AddChild(VAR);
node.generator = Factor3;
}
break;
}
case WordType.NUM:
{
var num = WordContainer.Advance(WordType.NUM);
node.AddChild(num);
node.generator = Factor4;
break;
}
default:
{
throw new BNFException();
}
}
return(node);
}
public static GATNode _expression(this LL1Processor ll1)
{
var node = new GATNode();
var offset = 0;
var search = WordContainer.GetWordType(offset);
var depth = 0;
var finishSearch = false;
while (search != WordType.IGNORE)
{
switch (search)
{
case WordType.SEMICOLON:
{
var simpleExpression = ll1._simpleExpression();
node.AddChild(simpleExpression);
node.generator = Expression1;
finishSearch = true;
break;
}
case WordType.EQUAL:
{
var VAR = ll1._var();
node.AddChild(VAR);
node.generator = Expression2;
WordContainer.Advance(WordType.EQUAL);
var expression = ll1._expression();
node.AddChild(expression);
finishSearch = true;
break;
}
case WordType.BRACKET_L:
{
depth++;
break;
}
case WordType.BRACKET_R:
{
depth--;
if (depth < 0)
{
var simpleExpression = ll1._simpleExpression();
node.AddChild(simpleExpression);
node.generator = Expression1;
finishSearch = true;
}
break;
}
}
if (finishSearch)
{
break;
}
offset++;
search = WordContainer.GetWordType(offset);
}
return(node);
}
