internal static IExpression Create(ExpressionContext context)
{
if (context.children.Count == 1)
{
ITerminalNode first = context.children[0] as ITerminalNode;
if (first != null && first.Symbol.Type == KScriptLexer.TRUE)
{
return(new BooleanLiteralExpression(true));
}
else if (first != null && first.Symbol.Type == KScriptLexer.FALSE)
{
return(new BooleanLiteralExpression(false));
}
else if (context.children[0] is BetweenExpressionContext)
{
BetweenExpressionContext btContext = context.children[0] as BetweenExpressionContext;
Literal a = LiteralFactory.Create(btContext.literal(0));
Literal b = LiteralFactory.Create(btContext.literal(1));
Literal c = LiteralFactory.Create(btContext.literal(2));
return(new AndExpression(
new RelationalExpression(a, b, KScriptLexer.GT_ET),
new RelationalExpression(a, c, KScriptLexer.LT)));
}
else if (context.children[0] is InExpressionContext)
{
InExpressionContext inContext = context.children[0] as InExpressionContext;
Literal literal = LiteralFactory.Create(inContext.literal());
IReadOnlyCollection <Literal> list = inContext.list().literal().Select(LiteralFactory.Create).ToList();
return(new InExpression(literal, list));
}
else if (context.children[0] is RelationalExpressionContext)
{
RelationalExpressionContext relContext = context.children[0] as RelationalExpressionContext;
Literal a = LiteralFactory.Create(relContext.literal(0));
IToken operatorToken = (relContext.children[1] as ITerminalNode).Symbol;
Literal b = LiteralFactory.Create(relContext.literal(1));
return(new RelationalExpression(a, b, operatorToken.Type));
}
else
{
throw new InvalidOperationException();
}
}
if (context.children.Count == 2)
{
ITerminalNode first = context.children[0] as ITerminalNode;
ITerminalNode last = context.children[1] as ITerminalNode;
if (first.Symbol.Type == KScriptLexer.NOT)
{
return(new NotExpression(Create(context.expression()[0])));
}
else
{
throw new InvalidOperationException();
}
}
else if (context.children.Count == 3)
{
ITerminalNode first = context.children[0] as ITerminalNode;
ITerminalNode middle = context.children[1] as ITerminalNode;
ITerminalNode last = context.children[2] as ITerminalNode;
if (middle != null && middle.Symbol.Type == KScriptLexer.AND)
{
IExpression a = Create(context.children[0] as ExpressionContext);
IExpression b = Create(context.children[2] as ExpressionContext);
return(new AndExpression(a, b));
}
else if (middle != null && middle.Symbol.Type == KScriptLexer.OR)
{
IExpression a = Create(context.children[0] as ExpressionContext);
IExpression b = Create(context.children[2] as ExpressionContext);
return(new OrExpression(a, b));
}
else if (first != null && last != null && first.Symbol.Type == KScriptLexer.OPEN_PAREN && last.Symbol.Type == KScriptLexer.CLOSE_PAREN)
{
return(Create(context.children[1] as ExpressionContext));
}
else
{
throw new InvalidOperationException();
}
}
else
{
throw new InvalidOperationException();
}
throw new NotImplementedException();
}
