Expression ParseSingle(ref int start, int end)
{
char token = source [start];
switch (token)
{
case '$':
case '@':
case '%':
if (start == end || start + 1 == source.Length || source [start + 1] != '(')
{
if (validation_type == ExpressionValidationType.StrictBoolean)
{
throw new InvalidProjectFileException(string.Format("missing '(' after '{0}' at {1} in \"{2}\"", source [start], start, source));
}
else
{
goto default; // treat as raw literal to the section end
}
}
start += 2;
int last = FindMatchingCloseParen(start, end);
if (last < 0)
{
if (validation_type == ExpressionValidationType.StrictBoolean)
{
throw new InvalidProjectFileException(string.Format("expression did not have matching ')' since index {0} in \"{1}\"", start, source));
}
else
{
start -= 2;
goto default; // treat as raw literal to the section end
}
}
Expression ret;
if (token == '$')
{
ret = EvaluatePropertyExpression(start, last);
}
else if (token == '%')
{
ret = EvaluateMetadataExpression(start, last);
}
else
{
ret = EvaluateItemExpression(start, last);
}
start = last + 1;
return(ret);
case '\'':
case '"':
var quoteChar = source [start];
start++;
last = FindMatchingCloseQuote(quoteChar, start, end);
if (last < 0)
{
if (validation_type == ExpressionValidationType.StrictBoolean)
{
throw new InvalidProjectFileException(string.Format("expression did not have matching ')' since index {0} in \"{1}\"", start, source));
}
else
{
start--;
goto default; // treat as raw literal to the section end
}
}
ret = new QuotedExpression()
{
QuoteChar = quoteChar, Contents = Parse(start, last)
};
start = last + 1;
return(ret);
// Below (until default) are important only for Condition evaluation
case '(':
if (validation_type == ExpressionValidationType.LaxString)
{
goto default;
}
start++;
last = FindMatchingCloseParen(start, end);
if (last < 0)
{
if (validation_type == ExpressionValidationType.StrictBoolean)
{
throw new InvalidProjectFileException(string.Format("expression did not have matching ')' since index {0} in \"{1}\"", start, source));
}
else
{
start--;
goto default; // treat as raw literal to the section end
}
}
var contents = Parse(start, last).ToArray();
if (contents.Length > 1)
{
throw new InvalidProjectFileException(string.Format("unexpected continuous expression within (){0} in \"{1}\"", contents [1].Column > 0 ? " at " + contents [1].Column : null, source));
}
return(contents.First());
default:
int idx = source.IndexOfAny(token_starters, start + 1);
string name = idx < 0 ? source.Substring(start, end - start) : source.Substring(start, idx - start);
var val = new NameToken()
{
Name = name
};
ret = new RawStringLiteral()
{
Value = val
};
if (idx >= 0)
{
start = idx;
}
else
{
start = end;
}
return(ret);
}
}
Expression ParseSingle (ref int start, int end)
{
char token = source [start];
switch (token) {
case '$':
case '@':
case '%':
if (start == end || start + 1 == source.Length || source [start + 1] != '(') {
if (validation_type == ExpressionValidationType.StrictBoolean)
throw new InvalidProjectFileException (string.Format ("missing '(' after '{0}' at {1} in \"{2}\"", source [start], start, source));
else
goto default; // treat as raw literal to the section end
}
start += 2;
int last = FindMatchingCloseParen (start, end);
if (last < 0) {
if (validation_type == ExpressionValidationType.StrictBoolean)
throw new InvalidProjectFileException (string.Format ("expression did not have matching ')' since index {0} in \"{1}\"", start, source));
else {
start -= 2;
goto default; // treat as raw literal to the section end
}
}
Expression ret;
if (token == '$')
ret = EvaluatePropertyExpression (start, last);
else if (token == '%')
ret = EvaluateMetadataExpression (start, last);
else
ret = EvaluateItemExpression (start, last);
start = last + 1;
return ret;
case '\'':
case '"':
var quoteChar = source [start];
start++;
last = FindMatchingCloseQuote (quoteChar, start, end);
if (last < 0) {
if (validation_type == ExpressionValidationType.StrictBoolean)
throw new InvalidProjectFileException (string.Format ("expression did not have matching ')' since index {0} in \"{1}\"", start, source));
else {
start--;
goto default; // treat as raw literal to the section end
}
}
ret = new QuotedExpression () { QuoteChar = quoteChar, Contents = Parse (start, last) };
start = last + 1;
return ret;
// Below (until default) are important only for Condition evaluation
case '(':
if (validation_type == ExpressionValidationType.LaxString)
goto default;
start++;
last = FindMatchingCloseParen (start, end);
if (last < 0) {
if (validation_type == ExpressionValidationType.StrictBoolean)
throw new InvalidProjectFileException (string.Format ("expression did not have matching ')' since index {0} in \"{1}\"", start, source));
else {
start--;
goto default; // treat as raw literal to the section end
}
}
var contents = Parse (start, last).ToArray ();
if (contents.Length > 1)
throw new InvalidProjectFileException (string.Format ("unexpected continuous expression within (){0} in \"{1}\"", contents [1].Column > 0 ? " at " + contents [1].Column : null, source));
return contents.First ();
default:
int idx = source.IndexOfAny (token_starters, start + 1);
string name = idx < 0 ? source.Substring (start, end - start) : source.Substring (start, idx - start);
var val = new NameToken () { Name = name };
ret = new RawStringLiteral () { Value = val };
if (idx >= 0)
start = idx;
else
start = end;
return ret;
}
}