public void AddRule(string rule)
{
var tokens = new Tokenizer().Tokenize(rule) !;
var regex = new RuleRegexParser().ParseRuleRegex(tokens[1]);
var pattern = new TestStringParser().Parse(tokens[2]);
Flags flags;
if (tokens.Count == 4)
{
flags = new FlagParser().Parse(tokens[3]);
}
else
{
flags = new Flags();
}
AddMatch(regex, flags);
AddAction(pattern, flags);
}
public IList<IRule> Parse(TextReader input)
{
string line;
var rules = new List<IRule>();
var builder = new RuleBuilder();
var lineNum = 0;
// parsers
var testStringParser = new TestStringParser();
var conditionParser = new ConditionPatternParser();
var regexParser = new RuleRegexParser();
var flagsParser = new FlagParser();
var tokenizer = new Tokenizer();
while ((line = input.ReadLine()) != null)
{
lineNum++;
if (string.IsNullOrEmpty(line))
{
continue;
}
if (line.StartsWith("#"))
{
continue;
}
var tokens = tokenizer.Tokenize(line);
if (tokens.Count > 4)
{
// This means the line didn't have an appropriate format, throw format exception
throw new FormatException($"Could not parse the mod_rewrite file. Message: '{"Too many tokens on line"}'. Line number '{lineNum}'.");
}
switch (tokens[0])
{
case "RewriteBase":
// the notion of the path base spans across all rules, not just mod_rewrite
// So not implemented for now
throw new NotImplementedException("RewriteBase is not implemented");
case "RewriteCond":
try
{
var pattern = testStringParser.Parse(tokens[1]);
var condActionParsed = conditionParser.ParseActionCondition(tokens[2]);
var flags = new Flags();
if (tokens.Count == 4)
{
flags = flagsParser.Parse(tokens[3]);
}
builder.AddConditionFromParts(pattern, condActionParsed, flags);
}
catch (FormatException formatException)
{
throw new FormatException($"Could not parse the mod_rewrite file. Line number '{lineNum}'.", formatException);
}
break;
case "RewriteRule":
try
{
var regex = regexParser.ParseRuleRegex(tokens[1]);
var pattern = testStringParser.Parse(tokens[2]);
Flags flags;
if (tokens.Count == 4)
{
flags = flagsParser.Parse(tokens[3]);
}
else
{
flags = new Flags();
}
builder.AddMatch(regex, flags);
builder.AddAction(pattern, flags);
rules.Add(builder.Build());
builder = new RuleBuilder();
}
catch (FormatException formatException)
{
throw new FormatException($"Could not parse the mod_rewrite file. Line number '{lineNum}'.", formatException);
}
break;
case "RewriteMap":
// Lack of use
throw new NotImplementedException("RewriteMap are not implemented");
case "RewriteEngine":
// Explicitly do nothing here, no notion of turning on regex engine.
break;
default:
throw new FormatException($"Could not parse the mod_rewrite file. Message: '{"Unrecognized keyword: " + tokens[0]}'. Line number '{lineNum}'.");
}
}
return rules;
}