internal static bool NeedsLeft(this XSharpToken token)
{
if (token == null)
{
return(false);
}
switch (token.Type)
{
case XSharpLexer.ASSIGN_ADD:
case XSharpLexer.ASSIGN_BITAND:
case XSharpLexer.ASSIGN_BITOR:
case XSharpLexer.ASSIGN_DIV:
case XSharpLexer.ASSIGN_EXP:
case XSharpLexer.ASSIGN_LSHIFT:
case XSharpLexer.ASSIGN_MOD:
case XSharpLexer.ASSIGN_MUL:
case XSharpLexer.ASSIGN_OP:
case XSharpLexer.ASSIGN_RSHIFT:
case XSharpLexer.ASSIGN_SUB:
case XSharpLexer.ASSIGN_XOR:
return(true);
case XSharpLexer.COLON:
case XSharpLexer.DOT:
return(true);
}
if (token.IsPrefix())
{
return(false);
}
return(token.IsBinary());
}
internal static bool IsPrimaryOrPrefix(this XSharpToken token)
{
if (token.IsPrimary())
{
return(true);
}
if (token.IsPrefix())
{
return(true);
}
return(false);
}
internal static bool CanJoin(this XSharpToken token, XSharpToken nextToken)
{
if (token == null)
{
return(nextToken.IsName() || nextToken.IsLiteral() || nextToken.IsPrefix());
}
if (token.IsPrefix() || token.IsBinary()) // we allow .and. .not. and even .not. .not.
{
return(nextToken.IsPrimaryOrPrefix());
}
if (nextToken.IsBinary() || nextToken.NeedsLeft() || nextToken.IsPostFix())
{
return(token.IsPrimary() || token.IsClose());
}
return(false);
}
internal static bool NeedsRight(this XSharpToken token)
{
return(token.IsBinary() || token.IsPrefix());
}