internal static ExpressionToken ReadExpression(TokenCollection stream)
{
if (stream.NextIsEndOfLine)
{
throw new HspLogicalLineException("式：読み込み中にスタックが空になった");
}
ExpressionTermToken elem = null;
List <ExpressionTermToken> elements = new List <ExpressionTermToken>();
do //最低一つはパラメータがあるはず。
{
if (stream.NextIsBracketEnd)
{
break;
}
if (stream.NextToken is OperatorPrimitive)
{
elem = (ExpressionTermToken)(ReadOperator(stream));
}
else if (stream.NextToken is LiteralPrimitive)
{
elem = (ExpressionTermToken)(ReadLiteral(stream));
}
else if (stream.NextToken is FunctionPrimitive)
{
elem = (ExpressionTermToken)(ReadFunction(stream, true));
}
else if (stream.NextToken is VariablePrimitive)
{
elem = (ExpressionTermToken)(ReadVariable(stream));
}
else
{
throw new HspLogicalLineException("式：不適切な要素を検出");
}
elements.Add(elem);
} while (!stream.NextIsEndOfParam);
ExpressionToken ret = new ExpressionToken(elements);
ret.RpnConvert();
return(ret);
}
