private static ArraySegment <TokenData <MetaToken> > LexArguments <T>(string src, TokenData <MetaToken> context, ArraySegment <TokenData <T> > tokens, int layer = 0) where T : Enum
{
var parts = new List <ArraySegment <TokenData <T> > >();
var start = 0;
var depth = 0;
for (int i = 0; i < tokens.Count; i++)
{
var token = tokens[i];
if (!(token.Type is Token type))
{
throw new SourceError(token.GetSourceIndex(), token.GetSourceLength(), SourceError.WrongContext);
}
if (type == Token.LeftBracket)
{
depth++;
if (depth == 1)
{
start = i + 1;
}
}
else if (type == Token.RightBracket)
{
if (depth == 1)
{
parts.Add(tokens.Slice(start, i - start));
start = i + 1;
}
depth--;
}
else if (type == Token.Seperator && depth == 1)
{
parts.Add(tokens.Slice(start, i - start));
start = i + 1;
}
}
if (depth != 0)
{
throw new SourceError(tokens.First().GetSourceIndex(), tokens.First().GetSourceLength(), SourceError.InvalidSyntax);
}
return(parts.Select(part => new TokenData <MetaToken>(MetaToken.Argument, context.Start, context.Length, tokens.Select(t => (TokenData <Enum>)t).ToArray(), Trim(LexMeta(src, part, layer)))).ToArray());
}
public static Expression ParseExpression(TokenData <MetaToken> target, ArraySegment <TokenData <MetaToken> > tokens)
{
if (tokens.Count == 0)
{
return(new VoidExpression(target.Start, target.Length));
}
else if (tokens.Count == 1)
{
var token = tokens[0];
switch (token.Type)
{
case MetaToken.SubExpression:
return(ParseExpression(token, token.LogicalChildren));
case MetaToken.IdentifierExpression:
{
if (token.Attributes.TryGetValue(Tokens.Name, out string name))
{
return(new IdentifierExpression(token.GetSourceIndex(), token.GetSourceLength(), name));
}
else
{
throw new SourceError(token.GetSourceIndex(), token.GetSourceLength(), SourceError.MissingAttribute);
}
}
case MetaToken.LiteralExpression:
{
if (token.Attributes.TryGetValue(Tokens.Value, out string value))
{
return(new LiteralExpression(token.GetSourceIndex(), token.GetSourceLength(), Compiler.NativeInt, value));
}
else
{
throw new SourceError(token.GetSourceIndex(), token.GetSourceLength(), SourceError.MissingAttribute);
}
}
case MetaToken.Call:
{
if (token.Attributes.TryGetValue(Tokens.Name, out string name))
{
return(new CallExpression(token.GetSourceIndex(), token.GetSourceLength(), name, token.LogicalChildren.Value.Select(child => ParseExpression(child, child.LogicalChildren))));
}
else
{
throw new SourceError(token.GetSourceIndex(), token.GetSourceLength(), SourceError.MissingAttribute);
}
}
default:
throw new SourceError(token.GetSourceIndex(), token.GetSourceLength(), SourceError.WrongContext);
}
}
else
{
var postfix = new List <TokenData <MetaToken> >();
var stack = new Stack <TokenData <MetaToken> >();
for (int i = 0; i < tokens.Count; i++)
{
var token = tokens[i];
switch (token.Type)
{
case MetaToken.SubExpression:
postfix.Add(token);
break;
case MetaToken.Operator:
stack.Push(token);
break;
case MetaToken.IdentifierExpression:
postfix.Add(token);
break;
case MetaToken.LiteralExpression:
postfix.Add(token);
break;
case MetaToken.Whitespace:
break;
default:
throw new SourceError(token.GetSourceIndex(), token.GetSourceLength(), SourceError.WrongContext);
}
}
while (stack.Count > 0)
{
postfix.Add(stack.Pop());
}
if (postfix.Count == 3)
{
var left = ParseExpression(postfix[0], new ArraySegment <TokenData <MetaToken> >(new[] { postfix[0] }));
var right = ParseExpression(postfix[1], new ArraySegment <TokenData <MetaToken> >(new[] { postfix[1] }));
var token = postfix[2];
if (token.Type == MetaToken.Operator)
{
if (token.Attributes.TryGetValue(Tokens.Name, out string name))
{
var op = new FunctionReference(target.GetSourceIndex(), target.GetSourceLength(), name, new[] { left.ReturnType, right.ReturnType });
return(new BinaryExpression(target.GetSourceIndex(), target.GetSourceLength(), left, op, right));
}
else
{
throw new SourceError(token.GetSourceIndex(), token.GetSourceLength(), SourceError.MissingAttribute);
}
}
else
{
throw new SourceError(token.GetSourceIndex(), token.GetSourceLength(), SourceError.InvalidExpression);
}
}
throw new SourceError(target.GetSourceIndex(), target.GetSourceLength(), SourceError.InvalidExpression);
}
}
