public static CatFxnType Create(string sType)
{
if (sType.Length == 0)
{
return(null);
}
Peg.Parser p = new Peg.Parser(sType);
try {
if (!p.Parse(CatGrammar.FxnType()))
{
throw new Exception("no additional information");
}
} catch (Exception e) {
throw new Exception(sType + " is not a valid function type ", e);
}
Peg.PegAstNode ast = p.GetAst();
if (ast.GetNumChildren() != 1)
{
throw new Exception("invalid number of children in abstract syntax tree");
}
AstFxnType node = new AstFxnType(ast.GetChild(0));
CatFxnType ret = new CatFxnType(node);
return(ret);
}
public static CatMetaDataBlock Create(string s)
{
s = "{{\n" + s + "\n}}\n";
Peg.Parser parser = new Peg.Parser(s);
bool bResult = parser.Parse(CatGrammar.MetaDataBlock());
if (!bResult)
{
throw new Exception("failed to parse meta-data block");
}
Peg.PegAstNode tree = parser.GetAst();
if (tree.GetNumChildren() == 0)
{
return(null);
}
if (tree.GetNumChildren() != 1)
{
throw new Exception("invalid number of child nodes in meta-data block node");
}
AstMetaDataBlock node = new AstMetaDataBlock(tree.GetChild(0));
CatMetaDataBlock ret = new CatMetaDataBlock(node);
return(ret);
}