private Expression ReadExpression(ScriptReader source, bool readTerminatingSymbolFromStream, params PredefinedSymbol[] endsWithSymbols)
{
Expression expression = new Expression();
int bracketLevel = 0;
while (bracketLevel >= 0)
{
foreach (PredefinedSymbol terminatingSymbol in endsWithSymbols)
{
if ((bracketLevel == 0) && (source.NextIsKeyword(terminatingSymbol, !readTerminatingSymbolFromStream)))
{
return(expression);
}
}
Token thisToken = source.PeekNextToken();
if (thisToken is EndOfStreamToken)
{
throw new CompilerMessage(ErrorCode.EndOfInputReached, "End of script reached in the middle of an expression");
}
CompilerUtils.AdjustBracketLevelIfTokenIsBracket(thisToken, ref bracketLevel);
if (bracketLevel >= 0)
{
expression.Add(source.ReadNextToken());
}
}
throw new CompilerMessage(ErrorCode.UnexpectedToken, "Unexpected '" + source.ReadNextToken() + "'");
}
private int FindIndexOfLowestPrecedenceOperator()
{
int foundIndex = -1;
int foundPrecedence = -1;
int bracketLevel = 0;
for (int i = 0; i < this.Count; i++)
{
if (CompilerUtils.AdjustBracketLevelIfTokenIsBracket(this[i], ref bracketLevel))
{
// do nothing, the bracketlevel has been changed
}
else if (bracketLevel == 0)
{
if (this[i] is OperatorToken)
{
int thisPrecedence = ((OperatorToken)this[i]).Precedence;
if (thisPrecedence > foundPrecedence)
{
foundPrecedence = thisPrecedence;
foundIndex = i;
}
}
else if (this[i] is KeywordToken)
{
if (((KeywordToken)this[i]).IsModificationOperator)
{
if (MODIFICATION_OPERATOR_PRECEDENCE > foundPrecedence)
{
foundPrecedence = MODIFICATION_OPERATOR_PRECEDENCE;
foundIndex = i;
}
}
}
}
}
return(foundIndex);
}