static DToken SearchBackward(TextDocument doc, int caretOffset, CodeLocation caret,out DToken lastToken)
{
var ttp = doc.GetText(0, caretOffset);
var sr = new StringReader(ttp);
var lexer = new Lexer(sr);
lexer.NextToken();
var stk=new Stack<DToken>();
while (lexer.LookAhead.Kind!=DTokens.EOF)
{
if (lexer.LookAhead.Kind == DTokens.OpenParenthesis || lexer.LookAhead.Kind==DTokens.OpenSquareBracket || lexer.LookAhead.Kind==DTokens.OpenCurlyBrace)
stk.Push(lexer.LookAhead);
else if (lexer.LookAhead.Kind == DTokens.CloseParenthesis || lexer.LookAhead.Kind == DTokens.CloseSquareBracket || lexer.LookAhead.Kind == DTokens.CloseCurlyBrace)
{
if (stk.Peek().Kind == getOppositeBracketToken( lexer.LookAhead.Kind))
stk.Pop();
}
lexer.NextToken();
}
lastToken = lexer.CurrentToken;
sr.Close();
lexer.Dispose();
if (stk.Count < 1)
return null;
return stk.Pop();
}
static DToken SearchForward(TextDocument doc, int caretOffset, CodeLocation caret, int searchedBracketToken)
{
var code = doc.GetText(caretOffset, doc.TextLength - caretOffset);
var lexer = new Lexer(new System.IO.StringReader(code));
lexer.SetInitialLocation(caret);
lexer.NextToken();
var stk = new Stack<DToken>();
while (lexer.LookAhead.Kind!=DTokens.EOF)
{
if (lexer.LookAhead.Kind == DTokens.OpenParenthesis ||
lexer.LookAhead.Kind == DTokens.OpenSquareBracket ||
lexer.LookAhead.Kind == DTokens.OpenCurlyBrace)
stk.Push(lexer.LookAhead);
else if (lexer.LookAhead.Kind == DTokens.CloseParenthesis ||
lexer.LookAhead.Kind == DTokens.CloseSquareBracket ||
lexer.LookAhead.Kind == DTokens.CloseCurlyBrace)
{
if(stk.Count != 0)
stk.Pop();
else if (lexer.LookAhead.Kind == searchedBracketToken)
return lexer.LookAhead;
}
lexer.NextToken();
}
lexer.Dispose();
if (stk.Count < 1)
return null;
return stk.Pop();
}