private void SubstituteValues(string path, Token <ParserTokenType> token)
{
bool processed = false;
string updatedValue = token.Value;
if (!String.IsNullOrEmpty(updatedValue))
{
int replaceCount = 0;
Regex.Match m = FrontendCompiler.ParseSubsitutions.Match(updatedValue);
while (m.Success)
{
processed = true; // found a substitution.
// This is an arbitrary upper limit for variable replacements to prevent
// inifite loops.
if (replaceCount > 2000)
{
this.OnMessage(new CompilerMessageEventArgs(CompilerMessage.InfiniteLoopInSubsitution(updatedValue), path, token.Range.Start.Line, token.Range.Start.Column, token.Range.End.Column));
return;
}
string beginning = updatedValue.Substring(0, m.Index);
string variableName = updatedValue.Substring(m.Index + 2, m.Length - 3);
string end = updatedValue.Substring(m.Index + m.Length);
string variableValue;
if (!this.Substitutions.TryGetValue(variableName, out variableValue))
{
this.OnMessage(new CompilerMessageEventArgs(CompilerMessage.UnknownSubstitution(variableName), path, token.Range.Start.Line, token.Range.Start.Column, token.Range.End.Column));
return;
}
updatedValue = String.Concat(beginning, variableValue, end);
m = FrontendCompiler.ParseSubsitutions.Match(updatedValue);
}
}
if (processed)
{
token.UpdateValue(updatedValue);
}
}
