public Statement Parse(ParserArgument args)
{
return(_parse(args));
}
public List <Statement> Parse(string text)
{
List <Statement> list = new List <Statement>();
var lines = text.Replace("\r", "").Split('\n');
int indentnum = 0;
for (int i = 0; i < lines.Length; i++)
{
text = lines[i];
Match m;
string indent;
string comment;
// get indent
m = Regex.Match(text, @"^(\s*)([^\s]?.*)$");
indent = m.Groups[1].Value;
text = m.Groups[2].Value;
// get comment
m = Regex.Match(text, @"(\s*#.*)$");
if (m.Success)
{
comment = m.Groups[1].Value;
text = text.Substring(0, text.Length - comment.Length);
}
else
{
comment = string.Empty;
text = text.Trim();
}
try
{
// enumerate generators
var args = new ParserArgument();
args.Text = text;
args.Formatter = new Formats.Formatter(_constants);
Statement st = null;
foreach (var parser in _parsers)
{
st = parser.Parse(args);
if (st != null)
{
indentnum += st.IndentThis;
st.Indent = new string(' ', indentnum < 0 ? 0 : indentnum * 4);
st.Comment = comment;
list.Add(st);
indentnum += st.IndentNext;
break;
}
}
if (st == null)
{
throw new ParseException("格式错误", i);
}
}
catch (OverflowException)
{
throw new ParseException("数值溢出", i);
}
catch (ParseException ex)
{
ex.Index = i;
throw;
}
}
// update address
for (int i = 0; i < list.Count; i++)
{
list[i].Address = i;
}
// pair For & Next
Stack <For> _fors = new Stack <For>();
for (int i = 0; i < list.Count; i++)
{
var st = list[i];
if (st is For)
{
_fors.Push(st as For);
}
else if (st is Next)
{
if (_fors.Count == 0)
{
throw new ParseException("找不到对应的For语句", i);
}
var @for = _fors.Pop();
var next = st as Next;
next.For = @for;
@for.Next = next;
}
else if (st is LoopControl)
{
if ((st as LoopControl).Level.Val > _fors.Count)
{
throw new ParseException("循环层数不足", i);
}
}
}
if (_fors.Count > 0)
{
throw new ParseException("For语句需要Next结束", _fors.Peek().Address);
}
// pair If & Else & Endif
Stack <If> _ifs = new Stack <If>();
for (int i = 0; i < list.Count; i++)
{
var st = list[i];
if (st is If)
{
_ifs.Push(st as If);
}
else if (st is Else || st is EndIf)
{
if (_ifs.Count == 0)
{
throw new ParseException("找不到对应的If语句", i);
}
var @if = _ifs.Peek();
if (st is Else)
{
if (@if.Else != null)
{
throw new ParseException("一个If只能对应一个Else", i);
}
var @else = st as Else;
@if.Else = @else;
@else.If = @if;
}
else
{
var endif = st as EndIf;
@if.EndIf = endif;
endif.If = @if;
_ifs.Pop();
}
}
}
if (_ifs.Count > 0)
{
throw new ParseException("If语句需要Endif结束", _ifs.Peek().Address);
}
return(list);
}
