internal void ProcessWhile()
{
int startWhileCondition = m_currentChar;
// A heuristic check against an infinite loop.
int cycles = 0;
int START_CHECK_INF_LOOP = CHECK_AFTER_LOOPS / 2;
Parser.Result argCache1 = null;
Parser.Result argCache2 = null;
bool stillValid = true;
while (stillValid)
{
m_currentChar = startWhileCondition;
Parser.Result arg1 = GetNextIfToken();
string comparison = Utils.GetComparison(m_data, ref m_currentChar);
Parser.Result arg2 = GetNextIfToken();
stillValid = EvalCondition(arg1, comparison, arg2);
int startSkipOnBreakChar = m_currentChar;
if (!stillValid)
{
break;
}
// Check for an infinite loop if we are comparing same values:
if (++cycles % START_CHECK_INF_LOOP == 0)
{
if (cycles >= MAX_LOOPS || (arg1.IsEqual(argCache1) && arg2.IsEqual(argCache2)))
{
throw new ArgumentException("Looks like an infinite loop after " +
cycles + " cycles.");
}
argCache1 = arg1;
argCache2 = arg2;
}
Parser.Result result = ProcessBlock();
if (result is Break)
{
m_currentChar = startSkipOnBreakChar;
break;
}
}
// The while condition is not true anymore: must skip the whole while
// block before continuing with next statements.
SkipBlock();
}
internal Parser.Result ProcessIf()
{
int startIfCondition = m_currentChar;
Parser.Result result = null;
Parser.Result arg1 = GetNextIfToken();
string comparison = Utils.GetComparison(m_data, ref m_currentChar);
Parser.Result arg2 = GetNextIfToken();
bool isTrue = EvalCondition(arg1, comparison, arg2);
if (isTrue)
{
result = ProcessBlock();
if (result is Continue || result is Break)
{
// Got here from the middle of the if-block. Skip it.
m_currentChar = startIfCondition;
SkipBlock();
}
SkipRestBlocks();
return(result);
}
// We are in Else. Skip everything in the If statement.
SkipBlock();
int endOfToken = m_currentChar;
string nextToken = Utils.GetNextToken(m_data, ref endOfToken);
if (ELSE_IF_LIST.Contains(nextToken))
{
m_currentChar = endOfToken + 1;
result = ProcessIf();
}
else if (ELSE_LIST.Contains(nextToken))
{
m_currentChar = endOfToken + 1;
result = ProcessBlock();
}
return(new Parser.Result());
}