public static bool IsValid(ref string expanded, SymbolDefinition context, FGGrammar.TokenSet expected)
{
var methodDef = context as MethodDefinition;
var checkKeyword = false;
for (var index = 0; (index = expanded.IndexOf('$', index)) != -1; )
{
var end = expanded.IndexOf('$', index + 1);
if (end < index)
break;
var macro = expanded.Substring(index + 1, end - index - 1);
switch (macro)
{
case "MethodName":
case "ArgumentList":
if (methodDef == null)
return false;
break;
case "ValidIfKeywordExpected":
checkKeyword = true;
expanded = expanded.Remove(index, end - index + 2);
continue;
case "ValidAsStatement":
if (expected != null && !expected.Matches(CsGrammar.Instance.tokenStatement))
return false;
expanded = expanded.Remove(index, end - index + 2);
continue;
case "NotValidAsStatement":
if (expected != null && expected.Matches(CsGrammar.Instance.tokenStatement))
return false;
expanded = expanded.Remove(index, end - index + 2);
continue;
case "ValidAsClassMember":
if (expected != null && !expected.Matches(CsGrammar.Instance.tokenClassBody))
return false;
expanded = expanded.Remove(index, end - index + 2);
continue;
case "ValidAsStructMember":
if (expected != null && !expected.Matches(CsGrammar.Instance.tokenStructBody))
return false;
expanded = expanded.Remove(index, end - index + 2);
continue;
case "ValidAsInterfaceMember":
if (expected != null && !expected.Matches(CsGrammar.Instance.tokenInterfaceBody))
return false;
expanded = expanded.Remove(index, end - index + 2);
continue;
case "ValidAsNamespaceMember":
if (expected != null && !expected.Matches(CsGrammar.Instance.tokenNamespaceBody))
return false;
expanded = expanded.Remove(index, end - index + 2);
continue;
case "ValidAsTypeDeclaration":
if (expected != null && !(
expected.Matches(CsGrammar.Instance.tokenNamespaceBody) ||
expected.Matches(CsGrammar.Instance.tokenClassBody) ||
expected.Matches(CsGrammar.Instance.tokenStructBody)
))
return false;
expanded = expanded.Remove(index, end - index + 2);
continue;
case "ValidInMethodBody":
if (methodDef == null)
return false;
expanded = expanded.Remove(index, end - index + 2);
continue;
case "ValidInPropertyBody":
if (context == null ||
context.kind != SymbolKind.Property &&
(context.parentSymbol == null || context.parentSymbol.kind != SymbolKind.Property))
return false;
expanded = expanded.Remove(index, end - index + 2);
continue;
}
index = end + 1;
}
if (checkKeyword && expected != null)
{
var index = 0;
while (expanded[index] >= 'a' && expanded[index] <= 'z')
++index;
if (index == 0)
{
if (expanded.StartsWith("!=", System.StringComparison.Ordinal) || expanded.StartsWith("==", System.StringComparison.Ordinal))
index = 2;
else
return false;
}
var keyword = expanded.Substring(0, index);
var tokenId = CsGrammar.Instance.TokenToId(keyword);
if (!expected.Matches(tokenId))
return false;
}
return true;
}
