private BlockNode ParseNestedControl(YamlToken p)
{
if (p.Kind != YamlTokenKind.StartObj)
{
_errorContainer.ParseError(p.Span, $"Unexpected token {p}");
throw new DocumentException();
}
var controlDef = ParseControlDef(p);
var block = new BlockNode
{
Name = controlDef
};
while (true)
{
p = _yaml.ReadNext();
switch (p.Kind)
{
case YamlTokenKind.EndObj:
return(block);
case YamlTokenKind.Property:
block.Properties.Add(new PropertyNode
{
Identifier = CharacterUtils.UnEscapeName(p.Property, _errorContainer),
Expression = new ExpressionNode
{
Expression = p.Value
}
});
break;
// StartObj can either be a Control or Function def
case YamlTokenKind.StartObj:
if (IsControlStart(p.Property))
{
var childNode = ParseNestedControl(p);
if (_errorContainer.HasErrors)
{
return(null);
}
block.Children.Add(childNode);
}
else
{
var functionNode = ParseFunctionDef(p);
if (_errorContainer.HasErrors)
{
return(null);
}
block.Functions.Add(functionNode);
}
break;
case YamlTokenKind.Error:
_errorContainer.ParseError(p.Span, p.Value);
return(null);
default:
_errorContainer.ParseError(p.Span, $"Unexpected yaml token: {p}");
throw new DocumentException();
}
}
}
// Name ( Parameter-Name As Data-type [ , Parameter-Name As Data-type ... ] ) : (ThisProperty or Parameter-Name) : Metadata-Name : Metadata-Value ... ...
// Currently iterating on what fields are present in the property metadata blocks
// Right now, only Default is permitted
private FunctionNode ParseFunctionDef(YamlToken p)
{
// Validation here mirrors validation in PA-Client
var paramRegex = new Regex(@"^([\p{L}\p{Nd}\p{Mn}\p{Mc}\p{Pc}\p{Cf}]+?)\s+As\s+([\p{L}\p{Nd}\p{Mn}\p{Mc}\p{Pc}\p{Cf}]+)");
var funcNameRegex = new Regex(@"^([\p{L}\p{Nd}\p{Mn}\p{Mc}\p{Pc}\p{Cf}]+?)\(");
var line = p.Property;
var m = funcNameRegex.Match(line);
if (!m.Success)
{
_errorContainer.ParseError(p.Span, $"Can't parse Function definition");
throw new DocumentException();
}
var funcName = m.Groups[1].Value;
var functionNode = new FunctionNode()
{
Identifier = funcName
};
line = line.Substring(m.Length);
m = paramRegex.Match(line);
while (m.Success)
{
string argName = CharacterUtils.UnEscapeName(m.Groups[1].Value, _errorContainer);
string kindName = CharacterUtils.UnEscapeName(m.Groups[2].Value, _errorContainer);
functionNode.Args.Add(new TypedNameNode
{
Identifier = argName,
Kind = new TypeNode
{
TypeName = kindName
}
});
line = line.Substring(m.Length).TrimStart(',', ' ');
m = paramRegex.Match(line);
}
if (line != ")")
{
_errorContainer.ParseError(p.Span, $"Missing closing ')' in function definition");
throw new DocumentException();
}
while (true)
{
p = _yaml.ReadNext();
switch (p.Kind)
{
case YamlTokenKind.EndObj:
return(functionNode);
// Expecting N+1 child objs where one is ThisProperty and the others N are the args
case YamlTokenKind.StartObj:
functionNode.Metadata.Add(ParseArgMetadataBlock(p));
break;
case YamlTokenKind.Error:
_errorContainer.ParseError(p.Span, p.Value);
return(null);
default:
_errorContainer.ParseError(p.Span, $"Unexpected yaml token: {p}");
throw new DocumentException();
}
}
}
internal static bool TryParseIdent(string source, out string parsed, out int length)
{
length = 0;
parsed = null;
if (source.Length == 0)
{
return(false);
}
var i = 0;
var result = new StringBuilder();
var hasDelimiterStart = CharacterUtils.IsIdentDelimiter(source[i]);
var hasDelimiterEnd = false;
if (!hasDelimiterStart)
{
// Simple identifier.
while (i < source.Length && CharacterUtils.IsSimpleIdentCh(source[i]))
{
result.Append(source[i]);
++i;
}
parsed = result.ToString();
length = i;
return(true);
}
// Delimited identifier.
++i;
// Accept any characters up to the next unescaped identifier delimiter.
for (; ;)
{
if (i >= source.Length)
{
break;
}
if (CharacterUtils.IsIdentDelimiter(source[i]))
{
if (i + 1 < source.Length && CharacterUtils.IsIdentDelimiter(source[i + 1]))
{
// Escaped delimiter.
result.Append(source[i]);
i += 2;
}
else
{
// End of the identifier.
hasDelimiterEnd = true;
++i;
break;
}
}
else
{
result.Append(source[i]);
++i;
}
}
if (hasDelimiterStart == hasDelimiterEnd && result.Length > 0)
{
length = i;
parsed = result.ToString();
return(true);
}
return(false);
}
