public static string Parse(Afx.Lexer lexer)
{
var contents = new StringBuilder();
var braceCount = 0;
if (lexer.IsOpeningBrace())
{
lexer.Consume();
}
else
{
throw new AfxException("Expression without braces");
}
while (true)
{
if (lexer.IsEnd())
{
throw new AfxException("Unfinished Expression \"" + contents.ToString() + "\"");
}
if (lexer.IsOpeningBrace())
{
braceCount++;
}
if (lexer.IsClosingBrace())
{
if (braceCount == 0)
{
lexer.Consume();
return(contents.ToString());
}
braceCount--;
}
contents.Append(lexer.Consume());
}
}
public static AstNode Parse(Afx.Lexer lexer)
{
if (lexer.IsOpeningBrace() && lexer.Peek(4) == "{...")
{
lexer.Consume();
lexer.Consume();
lexer.Consume();
lexer.Consume();
}
else
{
throw new AfxException("Spread without braces");
}
string contents = string.Empty;
int braceCount = 0;
while (true)
{
if (lexer.IsEnd())
{
throw new AfxException("Unifinished Spread");
}
if (lexer.IsOpeningBrace())
{
braceCount++;
}
if (lexer.IsClosingBrace())
{
if (braceCount == 0)
{
lexer.Consume();
return(new AstNode()
{
Type = AstNodeType.Expression,
Payload = contents
});
}
braceCount--;
}
contents += lexer.Consume();
}
}
