private void ButtonEquals_Click(object sender, RoutedEventArgs e)
{
Utils.log("ButtonEquals_Click", "Clicked Equals");
resetFlashTimer = true;
// if just hit equals, re-evaluate expression;
if (JUST_HIT_EQUALS)
{
Utils.log("ButtonEquals_Click", "Hit equals twice in a row");
ClearAllTokens();
this.TextBoxInputTokens.InsertRange(0, MEM_PREV_TOKENS);
currentToken = MEM_PREV_TOKENS.Count;
Utils.log("ButtonEquals_Click", "cToken = {0}", currentToken);
}
// Uncomment to view list of tokens.
/*string str = "";
foreach (Token t in TextBoxInputTokens)
{
Debugger.Log(0, "[ButtonEquals]", t.ToString());
str += t.getRepresentation();
}
Debugger.Log(0, "[ButtonEquals]", str);*/
this.TextBoxInputTokens.Add(new Token(TokenType.EOF, "Null"));
currentToken += 1;
Parser parser = new MathParser(this.TextBoxInputTokens);
try
{
parser.term();
// remove top element.
this.TextBoxInputTokens.RemoveAt(this.TextBoxInputTokens.Count - 1);
currentToken -= 1;
MEM_PREV_TOKENS = new List<Token>(new List<Token>(this.TextBoxInputTokens));
}
catch (SyntaxException excp)
{
// remove EOF token and error
this.TextBoxInputTokens.RemoveAt(this.TextBoxInputTokens.Count - 1);
currentToken -= 1;
MEM_ANS = 0;
this.answerTokens.Add(new IdentToken("MATH ERROR"));
DrawEquals();
this.currentToken = excp.getPosition();
UpdateTextBox();
return;
}
catch (Exception)
{
// remove EOF token and error
this.TextBoxInputTokens.RemoveAt(this.TextBoxInputTokens.Count - 1);
currentToken -= 1;
MEM_ANS = 0;
this.answerTokens.Add(new IdentToken("MATH ERROR"));
DrawEquals();
return;
}
AST output;
try
{
output = parser.Pop();
double answer = output.evaluate();
Utils.log("ButtonEquals_Click", "Answer = {0}", answer);
// Handle infinite answers.
if (Double.IsInfinity(answer))
{
MEM_ANS = 0;
this.answerTokens.Add(new IdentToken("MATH ERR (ANSWER TOO LARGE)"));
}
else
{
MEM_ANS = answer;
foreach (char c in Convert.ToString(answer))
{
if (c == '.')
{
this.answerTokens.Add(new DotToken());
}
else if (c == 'E')
{
this.answerTokens.Add(new OperationToken("x10", TokenType.OP_POW10));
}
else if (c == '-')
{
this.answerTokens.Add(new OperationToken("-", TokenType.OP_SUB));
}
else
{
this.answerTokens.Add(new DigitToken(Convert.ToString(c)));
}
}
}
Utils.log("ButtonEquals_Click", "Drawing AnswerBox");
DrawEquals();
}
catch (MathException)
{
// remove EOF token and error
this.TextBoxInputTokens.RemoveAt(this.TextBoxInputTokens.Count - 1);
currentToken -= 1;
MEM_ANS = 0;
this.answerTokens.Add(new IdentToken("MATH ERROR"));
DrawEquals();
return;
}
catch (Exception)
{
// remove EOF token and error
this.TextBoxInputTokens.RemoveAt(this.TextBoxInputTokens.Count - 1);
currentToken -= 1;
MEM_ANS = 0;
this.answerTokens.Add(new IdentToken("MATH ERROR"));
DrawEquals();
return;
}
}