public static LinkedListNode <Lexeme> TryParse(LinkedListNode <Lexeme> lexemes, out Expr resultNode)
{
resultNode = null;
var nextLexeme = UnaryExpr.TryParse(lexemes, out UnaryExpr pre);
if (pre != null)
{
resultNode = pre;
return(nextLexeme);
}
nextLexeme = ArrayInitializer.TryParse(nextLexeme, out ArrayInitializer arrInit);
if (arrInit != null)
{
resultNode = arrInit;
return(nextLexeme);
}
nextLexeme = Literal.TryParse(lexemes, out Literal lit);
if (lit != null)
{
resultNode = lit;
return(nextLexeme);
}
nextLexeme = TryParseNoLit(lexemes, out Expr nolit);
if (nolit != null)
{
resultNode = nolit;
return(nextLexeme);
}
return(lexemes);
}
public static LinkedListNode <Lexeme> TryParse(LinkedListNode <Lexeme> lexemes, out ArrayInitializer resultNode)
{
resultNode = null;
var nextLexeme = Type.TryParse(lexemes, out Type type);
if (type == null)
{
return(lexemes);
}
if (nextLexeme.Value.Type != LT.OP_SQBRACKET_O)
{
return(lexemes);
}
nextLexeme = nextLexeme.Next;
nextLexeme = Expr.TryParse(nextLexeme, out Expr len);
if (len == null)
{
return(lexemes);
}
if (nextLexeme.Value.Type != LT.OP_SQBRACKET_C)
{
return(lexemes);
}
nextLexeme = nextLexeme.Next;
Expr def = null;
if (nextLexeme.Value.Type == LT.OP_BRACE_O)
{
var braceLexeme = nextLexeme;
nextLexeme = nextLexeme.Next;
nextLexeme = Expr.TryParse(nextLexeme, out def);
if (def == null)
{
throw new Exception($"Missing default value at {nextLexeme.Value.File}:{nextLexeme.Value.Line}");
}
if (nextLexeme.Value.Type != LT.OP_BRACE_C)
{
nextLexeme = braceLexeme;
def = null;
}
else
{
nextLexeme = nextLexeme.Next;
}
}
resultNode = new ArrayInitializer {
DefaultValue = def, Length = len, Type = type, Token = lexemes.Value
};
return(nextLexeme);
}