protected virtual void AnalysExpression(LexemList lexems)
{
for (int i = 0; i < lexems.Count; i++)
{
var lexem = lexems[i];
if (lexem is LexemBracket)
{
i = this.SkipBrackets(lexems, i);
}
else if (lexem is LexemSwitch && lexem.ToString() == "?")
{
var sw = lexem as LexemSwitch;
var simetric = sw.Simetric;
if (simetric == null)
throw new FormatException("Switch syntax should have simetric Else path");
int index = lexems.FindPosition(simetric);
if (index <= i)
throw new FormatException("Switch syntax balance is incorrect");
var condition = lexems.Range(0, i);
var then = lexems.Range(i + 1, index - i - 1);
var other = lexems.Range(index + 1, lexems.Count - index - 1);
this.OnSwitch(sw, condition, then, other);
return;
}
}
this.AnalysLogical(lexems);
}
protected override void Analys(LexemList lexems)
{
if (lexems.Count > 2 && lexems[0] is LexemVariable && lexems[1] is LexemOperator && (lexems[1] as LexemOperator).Text == "=")
{
_variable = lexems[0] as LexemVariable;
if (String.IsNullOrEmpty(_variable.Name))
throw new FormatException("Assignable Variable Name is empty");
this.AnalysExpression(lexems.Range(2, lexems.Count - 2));
}
else
this.AnalysExpression(lexems);
}
protected void Scan(LexemList lexems, LexemOperator.OperationType type, string[] operators, Action<LexemList> action, bool parseFromLeftToRight = false)
{
//обычный разбор выражения должен идти справа налево (<-)
//например, попробуйте построить полиз для выражения: a-b+c или a/b*c
//только разбирая одноуровневые операции справа налево получится корректный полиз!!!
for (int i = parseFromLeftToRight ? 0 : lexems.Count - 1; 0 <= i && i < lexems.Count; i += (parseFromLeftToRight ? 1 : -1))
{
var lexem = lexems[i];
if (lexem is LexemBracket)
{
i = this.SkipBrackets(lexems, i, parseFromLeftToRight);
}
else if (lexem is LexemOperator)
{
var op = lexem as LexemOperator;
if (op.OperatorType == type && (operators == null || operators.Contains(op.Text)))
{
this.OnOperator(op, lexems.Range(0, i), lexems.Range(i + 1, lexems.Count - i - 1));
return;
}
}
}
if (action != null)
action(lexems);
}
protected override void OnElement(LexemList lexems)
{
this.AnalysExpression(lexems.Range(1, lexems.Count - 2));
}
protected override void OnElement(LexemList lexems)
{
_lexems.Add(lexems[0]);
this.AnalysExpression(lexems.Range(1, lexems.Count - 2));
_lexems.Add(lexems[lexems.Count - 1]);
}
