get_compare_type(char_u *p, int *len, int *type_is)
{
    exprtype_T	type = EXPR_UNKNOWN;
    int		i;

    switch (p[0])
    {
	case '=':   if (p[1] == '=')
			type = EXPR_EQUAL;
		    else if (p[1] == '~')
			type = EXPR_MATCH;
		    break;
	case '!':   if (p[1] == '=')
			type = EXPR_NEQUAL;
		    else if (p[1] == '~')
			type = EXPR_NOMATCH;
		    break;
	case '>':   if (p[1] != '=')
		    {
			type = EXPR_GREATER;
			*len = 1;
		    }
		    else
			type = EXPR_GEQUAL;
		    break;
	case '<':   if (p[1] != '=')
		    {
			type = EXPR_SMALLER;
			*len = 1;
		    }
		    else
			type = EXPR_SEQUAL;
		    break;
	case 'i':   if (p[1] == 's')
		    {
			// "is" and "isnot"; but not a prefix of a name
			if (p[2] == 'n' && p[3] == 'o' && p[4] == 't')
			    *len = 5;
			i = p[*len];
			if (!isalnum(i) && i != '_')
			{
			    type = *len == 2 ? EXPR_IS : EXPR_ISNOT;
			    *type_is = TRUE;
			}
		    }
		    break;
    }
    return type;
}
get_compare_type(char_u *p, int *len, int *type_is)
{
    exprtype_T	type = EXPR_UNKNOWN;
    int		i;

    switch (p[0])
    {
	case '=':   if (p[1] == '=')
			type = EXPR_EQUAL;
		    else if (p[1] == '~')
			type = EXPR_MATCH;
		    break;
	case '!':   if (p[1] == '=')
			type = EXPR_NEQUAL;
		    else if (p[1] == '~')
			type = EXPR_NOMATCH;
		    break;
	case '>':   if (p[1] != '=')
		    {
			type = EXPR_GREATER;
			*len = 1;
		    }
		    else
			type = EXPR_GEQUAL;
		    break;
	case '<':   if (p[1] != '=')
		    {
			type = EXPR_SMALLER;
			*len = 1;
		    }
		    else
			type = EXPR_SEQUAL;
		    break;
	case 'i':   if (p[1] == 's')
		    {
			 
			if (p[2] == 'n' && p[3] == 'o' && p[4] == 't')
			    *len = 5;
			i = p[*len];
			if (!isalnum(i) && i != '_')
			{
			    type = *len == 2 ? EXPR_IS : EXPR_ISNOT;
			    *type_is = TRUE;
			}
		    }
		    break;
    }
    return type;
}