cells-devel

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567 discussions

[cells-devel] How to force minimum delay between events in Cells?
by Mikko Ahonen 15 Feb '09

15 Feb '09

Hello, My first cells application was in production last week. I used LispWorks, CAPI and Cells to create an application which was used to verify names for people who are coming into an exhibition opening in the biggest museum in Finland. It was an touch screen application, and contained on-screen keyboard etc. It only took few days to complete and test the program. Everything worked perfectly! I had to cut few corners from the original specification, however. The keyboard was implemented using mouse button push and release events, which displayed the proper images representing the state of the buttons (button disabled, up or down). What I wanted was to force minimum delay after button down event before button up, so the key flashes just slightly longer. Any ideas what would be the best way to accomplish this? Best regards, Mikko Ahonen

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Re: [cells-devel] c-formula and setf
by Ramarren 15 Feb '09

15 Feb '09

> A cell should be calculated by a > formula if it isn't set to a value. I think the easiest way to achieve that would be to just use two cells, one c? and one c-in, and just have the former be equal to the latter if it is set, and to some formula if it is not. If you really want to have a consistent interface to the slot you should consider overriding accessor methods. Regards, Jakub

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[cells-devel] Sales Order from walmart.com
by cells-devel＠common-lisp.net 06 Feb '09

06 Feb '09

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[cells-devel] Is Israel a Democracy? -- The problem with intellectually insecure whites -- Should Christians Support Israeli Terrorism in Gaza?
by Lawrence Auster 23 Jan '09

23 Jan '09

The Jewish State of Israel has no constitution, nor does it name its borders. Israel's hidden constitution is Judaism. Israel's undeclared borders range from the Nile to the Euphrates rivers. Israel's desired jurisdiction extends over the entire Earth. It could not be more clear that the Jewish State follows a foreign policy which obeys Jewish Law as iterated in the Hebrew Bible, the Talmud, Maimonedes, the Cabalah, and the many commentaries and refinements of same. The Jews are genociding the native inhabitants of Palestine, just as their religion advises, and because their religion teaches them to do so. They treat non-Jews as if non-humans, just as their religion requires them to do. They make perpetual war on every nation on Earth, just as their genocidal Jewish God has instructed. The Jews of Israel are simply being Jews. Jews are an existential threat to the human race. Israel contains one third of the Jews of the World. It is not some aberration of the Jewish spirit, but the condensation and concentration of the perverse Jewish mentality, which malady also pervades the remaining two thirds of Jewry, who almost unanimously support the Jewish State, and who certainly do unanimously support the Jewish People and its consistent and constant crimes against the human race. Israel is Jewry and the danger of Israel is the danger of the Jewish People to all others, as the Jews have demonstrated each and every day of their existence. The Jews, the entire Jewish People of 15 million, will not relent until they have wiped out all non-Jews in "Greater Israel". They will not stop destroying all other cultures, nations, religions, ethnicities, races, competition, etc. until they are either stopped, or succeed in their ancient quest to destroy the human race. What Israel is doing is not some reaction to outside forces, nor was the formation of Israel a response to the Holocaust. Israel is simply following the plan laid out in the Jews' religious texts. The Jews have openly planned to take Palestine and genocide the native population of Palestine for some 2,500 years before the Holocaust. The Jews have openly complained that "anti-Semitism" is a threat that gives them the right to genocide the Palestinians, not merely since the advent of Nazism, but for some 2,500 years. The Jewish religion is the Constitution of the Jewish State of Israel, and, to a greater or lesser extent, the constitution of the nature of every Jew alive. The borders of Israel are the range the Jew roams over the entire World. The perverse Jewish mentality is inbred by a Jew's exposure to his parents and to his community. Judaism passes in the spit and slobber of Jewish mother telling her Jewish child that he is a "Jew", as much as Judaism passes in the poison and pain of a Talmudic tractate. The secular Jews did not suddenly come to life after the Enlightenment and the Jewish Reformation a body of vampires that appeared ex nihilo, in vacuo, mostly atheistical and undetached from formally practiced Judaism. Judaism is the Jew. It is a mindset that transcends and supercedes religion. It is a belief set, a way of life, a perception of one's self and one's relation to the World that makes a Jew, a Jew, and a danger to all of humanity. In fact, the religious shell of Judaism is like the stretched and infected skin of a lycanthropic pustule. When you lance it to cure the infection, the virus only becomes more contagious and spills directly on the non-Jew. The secular Jew is a deliberate product of the hyper-religious Jew, a monster created out of the hewed corpses of the fanatically religious Jew, a Golem which is conjured up to enter the World of the non-Jew and poison its blood, and boil its brain with a rabid lunacy that bites and spreads, until the infected community feeds on itself and fills the fields with rotting bloating bodies, where once human beings tilled the soil and tended to their families. The religious Jew created the secular Jew as an army of Esthers who seduce with open thighs, broad smiles, and a Siren call that lures in the non-Jew to cast his skull upon the jagged rocks and color the seas with his blood, sickened and blinded by the venereal disease of Judaism in secular form. Israel is not a secular democracy. It is a religious mockery. It is a rabid bat flying to the ends of the Earth, to end the Earth. No one will be free nor safe until the disease is quarantined and dies out. Source: http://www.ziopedia.org/articles/israel/how_can_israel_claim_to_be_a_%27dem… -------------------- The problem with intellectually insecure whites By Kevin MacDonald January 19, 2009 America will soon have a white minority. This is a much desired state of affairs for the hostile elites who hold political power and shape public opinion. But it certainly creates some management issues � at least in the long run. After all, it�s difficult to come up with an historical example of a nation with a solid ethnic majority (90% white in 1950) that has voluntarily decided to cede political and cultural power. Such transformations are typically accomplished by military invasions, great battles, and untold suffering. And it�s not as if everyone is doing it. Only Western nations view their own demographic and cultural eclipse as a moral imperative. Indeed, as I have noted previously, it is striking that racial nationalism has triumphed in Israel at the same time that the Jewish intellectual and political movements and the organized Jewish community have been the most active and effective force for a non-white America. Indeed, a poll in 2008 found that Avigdor Lieberman was the second most popular politician in Israel. Lieberman has advocated expulsion of Arabs from Israel and has declared himself a follower of Vladimir Jabotinsky, the leading pioneer of racial Zionism. The most popular politician in the poll was Benjamin Netanyahu � another admirer of Jabotinsky. Prime Minister Ehud Olmert and Foreign Minister Tzipi Livni are also Jabotinskyists. The racial Zionists are now carrying out yet another orgy of mass murder after a starvation-inducing blockade and the usual triggering assault designed to provoke Palestinian retaliation � which then becomes the cover for claims that Israel is merely defending itself against terrorism. This monstrosity was approved by overwhelming majorities of both Houses of Congress. The craven Bush administration did its part by abstaining from a UN resolution designed by the US Secretary of State as a result of a personal appeal by the Israeli Prime Minister. This is yet another accomplishment of the Israel Lobby, but one they would rather not have discussed in public. People might get the impression that the Lobby really does dictate US foreign policy in the Mideast. Obviously, such thoughts are only entertained by anti-Semites. But I digress. In managing the eclipse of white America, one strategy of the mainstream media is to simply ignore the issue. Christopher Donovan (�For the media, the less whites think about their coming minority status, the better�) has noted that the media, and in particular, the New York Times, are quite uninterested in doing stories that discuss what white people think about this state of affairs. It�s not surprising that the New York Times � the Jewish-owned flagship of anti-white, pro-multicultural media � ignores the issue. The issue is also missing from so-called conservative media even though one would think that conservatives would find the eclipse of white America to be an important issue. Certainly, their audiences would find it interesting. Now we have an article �The End of White America� written by Hua Hsu, an Assistant Professor of English at Vassar College. The article is a rather depressing display of what passes for intellectual discourse on the most important question confronting white people in America. Hsu begins by quoting a passage in F. Scott Fitzgerald�s The Great Gatsby in which a character, Tom Buchanan, states: �Have you read The Rise of the Colored Empires by this man Goddard?� � Well, it�s a fine book, and everybody ought to read it. The idea is if we don�t look out the white race will be�will be utterly submerged. It�s all scientific stuff; it�s been proved.� Buchanan�s comment is a thinly veiled reference to Lothrop Stoddard�s The Rising Tide of Color which Hsu describes as �rationalized hatred� presented in a scholarly, gentlemanly, and scientific tone. (This wording that will certainly help him when he comes up for tenure.) As Hsu notes, Stoddard had a doctorate from Harvard and was a member of many academic associations. His book was published by a major publisher. It was therefore �precisely the kind of book that a 1920s man of Buchanan�s profile � wealthy, Ivy League�educated, at once pretentious and intellectually insecure � might have been expected to bring up in casual conversation.� Let�s ponder that a bit. The simple reality is that in the year 2009 an Ivy League-educated person, "at once pretentious and intellectually insecure," would just as glibly assert the same sort of nonsense as Hsu. To wit: The coming white minority does not mean that the racial hierarchy of American culture will suddenly become inverted, as in 1995�s White Man�s Burden, an awful thought experiment of a film, starring John Travolta, that envisions an upside-down world in which whites are subjugated to their high-class black oppressors. There will be dislocations and resentments along the way, but the demographic shifts of the next 40 years are likely to reduce the power of racial hierarchies over everyone�s lives, producing a culture that�s more likely than any before to treat its inhabitants as individuals, rather than members of a caste or identity group. The fact is that no one can say for certain what multicultural America without a white majority will be like. There is no scientific or historical basis for claims like �the demographic shifts of the next 40 years are likely to reduce the power of racial hierarchies over everyone�s lives, producing a culture that�s more likely than any before to treat its inhabitants as individuals, rather than members of a caste or identity group.� Indeed, there is no evidence at all that we are proceeding to a color blind future. The election results continue to show that white people are coalescing in the Republican Party, while the Democrats are increasingly the party of a non-white soon-to-be majority. Is it so hard to believe that when this coalition achieves a majority that it will further compromise the interests of whites far beyond contemporary concerns such as immigration policy and affirmative action? Hsu anticipates a colorblind world, but affirmative action means that blacks and other minorities are certainly not treated as individuals. And it means that whites � especially white males � are losing out on opportunities they would have had without these policies and without the massive non-white immigration of the last few decades. Given the intractability of changing intelligence and other traits required for success in the contemporary economy, it is unlikely that 40 more years of affirmative action will attain the outcomes desired by the minority lobbies. Indeed, in Obama's America, blacks are rioting in Oakland over perceived racial injustices, and from 2002 �2007, black juvenile homicide victims increased 31%, while black juvenile homicide perpetrators increased 43%. Hence, the reasonable outlook is for a continuing need for affirmative action and for racial activism in these groups, even after whites become a minority. Whites will also lose out because of large-scale importation of relatively talented immigrants from East Asia. Indeed, as I noted over a decade ago, "The United States is well on the road to being dominated by an Asian technocratic elite and a Jewish business, professional, and media elite." Hsu shows that there already is considerable anxiety among whites about the future. An advertizing executive says, �I think white people feel like they�re under siege right now � like it�s not okay to be white right now, especially if you�re a white male. ... People are stressed out about it. �We used to be in control! We�re losing control�� Another says, "There�s a lot of fear and a lot of resentment." It's hard to see why these feelings won't increase in the future. A huge problem for white people is lack of intellectual and cultural confidence. Hsu quotes Christian (Stuff White People Like) Lander saying, "I get it: as a straight white male, I�m the worst thing on Earth." A professor comments that for his students "to be white is to be culturally broke. The classic thing white students say when you ask them to talk about who they are is, �I don�t have a culture.� They might be privileged, they might be loaded socioeconomically, but they feel bankrupt when it comes to culture � They feel disadvantaged, and they feel marginalized." This lack of cultural confidence is no accident. For nearly 100 years whites have been subjected to a culture of critique emanating from the most prestigious academic and media institutions. And, as Hsu points out, the most vibrant and influential aspect of American popular culture is hip-hop�a product of the African American urban culture. The only significant group of white people with any cultural confidence centers itself around country music, NASCAR, and the small town values of traditional white America. For this group of whites � and only this group � there is "a racial pride that dares not speak its name, and that defines itself through cultural cues instead�a suspicion of intellectual elites and city dwellers, a preference for folksiness and plainness of speech (whether real or feigned), and the association of a working-class white minority with 'the real America.'� This is what I term implicit whiteness � implicit because explicit assertions of white identity have been banned by the anti-white elites that dominate our politics and culture. It is a culture that, as Hsu notes, "cannot speak its name." But that implies that the submerged white identity of the white working class and the lack of cultural confidence exhibited by the rest of white America are imposed from outside. Although there may well be characteristics of whites that facilitate this process, this suppression of white identity and interests is certainly not the natural outcome of modernization or any other force internal to whites as a people. In my opinion, it is the result of the successful erection of a culture of critique in the West dominated by Jewish intellectual and political movements. The result is that educated, intellectually insecure white people these days are far more likely to believe in the utopian future described by Hsu than in hard and cautious thinking about what the future might have in store for them. It's worth dwelling a bit on the intellectual insecurity of the whites who mindlessly utter the mantras of multiculturalism that they have soaked up from the school system and from the media. Most people do not have much confidence in their intellectual ability and look to elite opinion to shape their beliefs. As I noted elsewhere, A critical component of the success of the culture of critique is that it achieved control of the most prestigious and influential institutions of the West, and it became a consensus among the elites, Jewish and non-Jewish alike. Once this happened, it is not surprising that this culture became widely accepted among people of very different levels of education and among people of different social classes. Most people are quite insecure about their intellectual ability. But they know that the professors at Harvard, and the editorial page of the New York Times and the Washington Post, and even conservative commentators like Rush Limbaugh and Sean Hannity are all on page when it comes to racial and ethnic issues. This is a formidable array, to the point that you almost have to be a crank to dissent from this consensus. I think one of the greatest triumphs of the left has been to get people to believe that people who assert white identity and interests or who make unflattering portrayals of organized Jewish movements are morally degenerate, stupid, and perhaps psychiatrically disturbed. Obviously, all of these adjectives designate low status. The reality is that the multicultural emperor has no clothes and, because of its support for racial Zionism and the racialism of ethnic minorities in America, it is massively hypocritical to boot. The New York Times, the academic left, and the faux conservatives that dominate elite discourse on race and ethnicity are intellectually bankrupt and can only remain in power by ruthlessly suppressing or ignoring the scientific findings. This is particularly a problem for college-educated whites. Like Fitzgerald's Tom Buchanan, such people have a strong need to feel that their ideas are respectable and part of the mainstream. But the respectable mainstream gives them absolutely nothing with which to validate themselves except perhaps the idea that the world will be a better place when people like them no longer have power. Hsu quotes the pathetic Christian Lander: "�Like, I�m aware of all the horrible crimes that my demographic has done in the world. ... And there�s a bunch of white people who are desperate � desperate � to say, �You know what? My skin�s white, but I�m not one of the white people who�s destroying the world.�� As a zombie leftist during the 1960s and 1970s, I know what that feeling of desperation is like � what it's like to be a self-hating white. We must get to the point where college-educated whites proudly and confidently say they are white and that they do not want to become a minority in America. This reminds me of the recent docudrama Milk, which depicts the life of gay activist Harvey Milk. Milk is sure be nominated for an Oscar as Best Picture because it lovingly illustrates a triumph of the cultural left. But is has an important message that should resonate with the millions of whites who have been deprived of their confidence and their culture: Be explicit. Just as Harvey Milk advocated being openly gay even in the face of dire consequences, whites need to tell their family and their friends that they have an identity as a white person and believe that whites have legitimate interests as white people. They must accept the consequences when they are harassed, fired from their jobs, or put in prison for such beliefs. They must run for political office as openly pro-white. Milk shows that homosexuals were fired from their jobs and arrested for congregating in public. Now it's the Southern Poverty Law Center and the rest of the leftist intellectual and political establishment that harasses and attempts to get people fired. But it's the same situation with the roles reversed. No revolution was ever accomplished without some martyrs. The revolution that restores the legitimacy of white identity and the legitimacy of white interests will be no exception. But it is a revolution that is absolutely necessary. The white majority is foolish indeed to entrust its future to a utopian hope that racial and ethnic identifications will disappear and that they won�t continue to influence public policy in ways that compromise the interests of whites. It does not take an overactive imagination to see that coalitions of minority groups could compromise the interests of formerly dominant whites. We already see numerous examples in which coalitions of minority groups attempt to influence public policy, including immigration policy, against the interests of the whites. Placing ourselves in a position of vulnerability would be extremely risky, given the deep sense of historical grievance fostered by many ethnic activists and organized ethnic lobbies. This is especially the case with Jews. Jewish organisations have been unanimous in condemning Western societies, Western traditions, and Christianity, for past crimes against Jews. Similar sentiments are typical of a great many African Americans and Latinos, and especially among the ethnic activists from these groups. The �God damn America� sermon by President Obama's pastor comes to mind as a recent notorious example. The precedent of the early decades of the Soviet Union should give pause to anyone who believes that surrendering ethnic hegemony does not carry risks. The Bolshevik revolution had a pronounced ethnic angle: To a very great extent, Jews and other non-Russians ruled over the Russian people, with disastrous consequences for the Russians and other ethnic groups that were not able to become part of the power structure. Jews formed a hostile elite within this power structure � as they will in the future white-minority America; Jews were �Stalin�s willing executioners.� Two passages from my review of Yuri Slezkine's The Jewish Century seem particularly appropriate here. The first passage reminds me of the many American Jews who adopt a veneer of support for leftist versions of social justice and racial tolerance while nevertheless managing to support racial Zionism and the mass murder, torture, and incarceration of the Palestinian people in one of the largest prison systems the world has ever seen. Such people may be very different when they become a hostile elite in a white-minority America. Many of the commentators on Jewish Bolsheviks noted the �transformation� of Jews [after the Bolshevik Revolution]. In the words of [a] Jewish commentator, G. A. Landau, �cruelty, sadism, and violence had seemed alien to a nation so far removed from physical activity.� And another Jewish commentator, Ia. A. Bromberg, noted that: the formerly oppressed lover of liberty had turned into a tyrant of �unheard-of-despotic arbitrariness��. The convinced and unconditional opponent of the death penalty not just for political crimes but for the most heinous offenses, who could not, as it were, watch a chicken being killed, has been transformed outwardly into a leather-clad person with a revolver and, in fact, lost all human likeness. ... After the Revolution, ... there was active suppression of any remnants of the older order and their descendants. ... The mass murder of peasants and nationalists was combined with the systematic exclusion of the previously existing non-Jewish middle class. The wife of a Leningrad University professor noted, �in all the institutions, only workers and Israelites are admitted; the life of the intelligentsia is very hard� (p. 243). Even at the end of the 1930s, prior to the Russification that accompanied World War II, �the Russian Federation�was still doing penance for its imperial past while also serving as an example of an ethnicity-free society� (p. 276). While all other nationalities, including Jews, were allowed and encouraged to keep their ethnic identities, the revolution remained an anti-majoritarian movement. The difference from the Soviet Union may well be that in white-minority America it will not be workers and Israelites who are favored, but non-whites and Israelites. Whites may dream that they are entering the post-racial utopia imagined by their erstwhile intellectual superiors. But it is quite possible that they are entering into a racial dystopia of unimaginable cruelty in which whites will be systematically excluded in favor of the new elites recruited from the soon-to-be majority. It's happened before. Kevin MacDonald is a professor of psychology at California State University�Long Beach. Permanent URL with hyperlinks: http://www.theoccidentalobserver.net/articles/MacDonald-Hsu.html ----------- Should Christians Support Israeli Terrorism in Gaza? A timely discussion between Rev. Ted Pike and Dr. David Duke, one especially important for the Christians in our audience http://www.davidduke.com/mp3/dukeradio090122DukeandPikeonGaza.mp3 In this vital discussion, Rev. Pike and Dr. Duke explore the Pro-Israel attitude of some Christian evangelical organizations, and why their position not only goes directly against Christian morality and decency, but actually is directly opposite of that expressed by Christian Scriptures. Today, Many Christians are instructed that Jews and today�s Israel has a special covenant� with God. In fact, the New Testament in the clearest of language states that the Jews �continued not in my covenant, and I considered them not, saith the Lord.� Here�s the quote that Christians aren�t supposed to notice.: 8:10 Not according to the covenant that I made with their fathers, in the day when I took them by the hand out of the land of Egypt; because they continued not in my covenant, and I regarded them not, saith the Lord. (Hebrews 8:10) They also don�t seem to notice that a 2000 year old Judaic war against Christianity that has been waged since time of Jesus Christ and still goes on today with the most powerful Jewish organizations attempting to destroy European and American traditions, that has even become a war on our Christmas traditions. Dr. Duke and Ted Pike also speak about how over a hundred thousand Christian Palestinians have suffered with their families from anti-Christian Israel! Christian support of Israel has resulted in the very birthplace of Jesus Christ, go from 90 percent Palestinian Christians to 35 percent today because of Israeli terror and occupation. They ask, �How could any Christian in good conscience support the anti-Christian state of Israel, bombing the homes, killing and maiming, torturing and oppressing fellow Christian men, women and children?� This is a vital show for every Christian reader and listener of DavidDuke.com. Next time, you hear someone say, �God tells us that we must support Israel� you will have the clear Christian answer that just the opposite is true! For documentation on this be sure to read some of the well-footnoted, sample chapters of Jewish Supremacism and My Awakening. Source : http://www.davidduke.com/general/should-christians-support-israeli-terroris… ------------------------------------- You or someone using your email adress is currently subscribed to the Lawrence Auster Newletter. If you wish to unsubscribe from our mailing list, please let us know by calling to 1 212 865 1284 Thanks, Lawrence Auster, 238 W 101 St Apt. 3B New York, NY 10025 Contact: lawrence.auster(a)att.net -------------------------------------

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[cells-devel] Cells: Controlling the way kids are added to a parent ...
by Frank Goenninger 31 Oct '08

31 Oct '08

Hi - I want to control if a kid is added to a parent based on the execution of a check function. The check function is supposed to throw an condition when the check fails. Current use case: Control which classes of kids are added to a parent. I do have a model of class BOM (bill of material) that only can accept classes Assembly and Part as kids. I found two places at which I could insert a call to the check function: function fm-kid-add (higher level interface) function fm-kid-insert (lower level interface) Question now is: Why would one be better than the other? Idea here is based on adding a new slot to class family: (defmodel family (model) ((.kid-slots :cell nil :initform nil :accessor kid-slots :initarg :kid-slots) (.kids :initform (c-in nil) ;; most useful :owning t :accessor kids :initarg :kids) (registry? :cell nil :initform nil :initarg :registry? :accessor registry?) (registry :cell nil :initform nil :accessor registry) ;; added: frgo, 2008-10-30 ----- (kid-add-control-hook :cell nil :initform nil :initarg: kid-add-control-hook))) and then do run the check functions that have been added to the control hook (= list of functions to be funcalled). Right approach? Any comments? (It works but I'd like to know if am on the right track). Thanks for feedback. Cheers Frank

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[cells-devel] Family Registry ? What for ?
by Frank Goenninger 23 Oct '08

23 Oct '08

While inspecting a model I saw the registry? slot - but no registry being assigned ... Which lead to an assertion failure afterwards. So: What for is the registry mechanism? Different families ? Thx for info. Cheers Frank

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[cells-devel] Pentagon of Death [was Re: Vancouver Lisp Users Group meeting for October 2008 - The Nature of Order]
by Kenny 14 Oct '08

14 Oct '08

puchacz wrote: > On Oct 4, 11:03 pm, Kenny <kentil...(a)gmail.com> wrote: > >>Patrick May wrote: >> >>>Kenny <kentil...(a)gmail.com> writes: >> >>>>Patrick May wrote: >> >>>>>Kenny <kentil...(a)gmail.com> writes: >> >>>>>>I wonder if Flash can keep up with compiled JS. You don't mind the >>>>>>Flash requirement? I realize it is ubiquitous enough, but still. >> >>>>> It loads relatively slowly, but once it's loaded it's as fast >>>>>as a desktop app (not surprisingly). I selected it despite the >>>>>Flash requirement because it provided a nice grid control and the >>>>>chart displays I needed. >> >>>>JS frameworks don't have those? >> >>> Some have one, some have the others, some have some other bits I >>>wanted to use. TIBCO's GI was actually my first choice, but there was >>>a bug in Safari that prevented me from using it. >> >>I was just going to say one big win would be insulation from browser >>variability. >> >> >> >> >>>>Or was it more like you had zero reason to avoid Flash (and maybe >>>>already knew it) so there was no reason to hassle with less polished >>>>tools? I suppose you also had the means to acquire the tools. >> >>> Actually, I felt rather dirty using Flash. And not in that good, >>>tingly way. >> >>:) >> >> >> >> >>> Aside from the chart widgets, the tools are free (as in beer). >> >>What's your IDE, Eclipse? >> >> >> >> >>>[ . . . ] >> >>>>No Cells? Are you mad? For a GUI? Celtk and Cells-Gtk (and soon >>>>Xello) will show you how to drive an existing framework with Cells. >> >>> This application is a trading system. If Cells is fast enough, >>>it might be a good choice for the backend. Can I get a response in 10 >>>milliseconds when an order book changes? >> >>10ms is an eternity! I know, I have a feel for that having done >>RoboCells in which we handled realtime inputs spaced at 100ms. >> >>Otherwise, not sure what you are asking. Naturally a very interesting >>question is how long does the functional computation take. But I will >>presume that is in order and what you are asking is if Cells is a pig. >>No. (see "RoboCells"). In fact, Cells helps a bit by magically >>discerning exactly what needs to be updated when X changes. I tried to >>tell the walking dead at ECLM 2008 that Cells is a library about change. >> Practically, this means one has complete control over change, >>including the aforementioned optimization of changing only those things >>that need to change, but also being able to surgically control "oh, I do >>not need to update /that/ every 10ms, I can do it every other unless of >>courese Y changes by 42%". Stuff like that. >> >>Well, if js/html/css get on my nerves I'll take a look at Fex/MXML. Thx >>for the lead. >> >>kt > > > Hi, > > Is Cells able to handle updates in a "diamond scenario"? > > "a": external input > "b": driven from "a" > "c": driven from "a" > "d": driven from "b" and "c" > > As "d" is driven indirectly from a single input "a", and processing of > "b" and "c" may take different time, it is important to wait with > updating of "d" until both "b" and "c" is finished. Otherwise, "d" may > publish its value twice, and the first value would be totally > incorrect, like a huge spike in the series. PWUAHAHAHAHAHHAHAA! I thought I invented that. Philip Eby gave it a more dramatic name when I explained it to him while justifying the Cells mechanism -- the Pentagon of Death, I think it was. Why Pentagon aka 5? I settled on a tougher case in which, eg, d did not depend directly on c, but did so indirectly thru an intermediary depencency c2 which depended on c. Why does this matter? If a changes c needs to be recalculated, period, no question. But C might recompute and come up with the same value, say if A changes from 3 to 6 and C is (mod A 3). In that case we cannot know C2 is obsolete until C runs, and this defeats some algorithms (assuming we have a rule that says "never calculate unecessarily"). I also made it nastier in that...well, it gets complicated, but Cells tracks dynamic dependencies, not lexical, so I cannot just inspect the dependency graph as it stands -- the change to 'a' might make 'd' go after 'c2' for the first time ever in 'd's life. Philip struggled mightily to find a better way than the Cells algorithm, but in the end the Pentagon of Death beat every alternative. Thx for the heads up on the prior art. cheers,ken

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[cells-devel] Cells: File test-cc.lisp missing in CVS
by Frank Goenninger 13 Oct '08

13 Oct '08

Hi Kenny, just noticed your latest commits to CVS for Cells. I dl'ed it and found that both in cells.asd and cells.lpr the file test-cc.lisp is mentioned but missing in the repository. Could you please add this? Thanks! Best, Frank

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[cells-devel] Celtk contrib: ttk::treeview
by Madhu 28 Sep '08

28 Sep '08

Attached is a small hack for using ttk::treeview - the hierarchical multicolumn data display widget, within CTK. See man ttk_treeview(n). There is a small example at the bottom of the file. I'm attaching a second file which tests the widget on the filesystem directory structure (ala the tree.tcl which is bundled with the tk 8.5 demos). This uses `portable' cl pathname functions, so it may be rough depending on your lisp implementation. I'm hoping to get feedback, especially from Kenny, on the correct or incorrect use of cells here. I'm using the cells family model to structure the tree hierarchy. scrollbars are not done in this version. I expect there will be changes to Celtk scrollers so it won't be necessary to handle those here. -- Madhu [1] In particular I have a question inside dirtree example. The directories displayed have to be opened by double clicking the listed items -- There is no "openable" icon next to them. Now If I could create a dummy kid Tk will display the entry as openable. Cells did not let me create an initial dummy kids list (search for "HOWTO" in dirtree-test.lisp), that I could later swap out with an expanded list inside the on-open callback. [This, even when I wrap calls to with-integrity.] ;;; -*- Mode: LISP; Package: :cl-user; BASE: 10; Syntax: ANSI-Common-Lisp; -*- ;;; ;;; Time-stamp: <2008-09-27 13:43:34 madhu> ;;; Touched: Wed Sep 24 11:12:58 2008 +0530 <enometh(a)net.meer> ;;; Bugs-To: enometh(a)net.meer ;;; Status: Experimental. Do not redistribute ;;; Copyright (C) 2008 Madhu. All Rights Reserved. ;;; ;;; Celtk support for the ttk::treeview Hierarchical multicolumn data display ;;; widget. See man ttk_treeview(n). This implementation was based on Tk 8.5.2 ;;; on linux. ;;; (in-package "CTK") ;;; ---------------------------------------------------------------------- ;;; ;;; TREEVIEW-ITEM: Interface to the ttk::treeview widget `item' command. This ;;; object is in Celtk only, not present in Tk. Each object represents a ;;; hierarchical item contained in treeview. The Cells family model is used to ;;; specify the hierarchy. The root of the tree is a treeview object. See ;;; TREEVIEW. (deftk treeview-item (tk-object family) ((idx :cell nil :initarg :idx :accessor idx :initform nil) (on-select :initarg :on-select :initform nil :accessor on-select) (on-close :initarg :on-close :initform nil :accessor on-close) (on-open :initarg :on-open :initform nil :accessor on-open)) (:tk-spec treeview-item -text -image (values-lst -values) (openp -open) -tags) (:default-initargs :id (gentemp "TVI"))) (defmethod tk-configure ((self treeview-item) option value) (assert (idx self) () "cannot configure ~a ~a until instantiated with id." (tk-class self) self) (tk-format `(:configure ,self ,option) "~a item ~a ~a ~a" (path .parent) (idx self) (down$ option) (tk-send-value value))) (defmethod make-tk-instance :around ((self treeview-item)) (when (upper self treeview) (call-next-method))) (defmethod make-tk-instance ((self treeview-item)) (with-integrity (:client `(:make-tk ,self)) (setf (idx self) (tk-eval "~a insert ~a end ~{~(~a~) ~a~^ ~}" (path (upper self treeview)) (let ((parent (fm-parent self))) (etypecase parent (treeview-item (idx parent)) (treeview "{}"))) (tk-configurations self))))) (defmethod not-to-be :after ((self treeview-item)) (unless (find .tkw *windows-destroyed*) (tk-format `(:delete ,self) "~a delete ~a" (path (upper self treeview)) (idx self)))) (defun rearrange-treeview-items (self oldkids newkids) (declare (type (or treeview-item treeview ) self)) (bwhen (root (upper self treeview)) (loop for k in oldkids do (tk-format `(:post-make-tk ,self) "~a detach ~a" (path root) (idx k))) (loop for k in newkids for i from 0 do (tk-format `(:post-make-tk ,self) "~a move ~a ~a ~d" (path root) (idx k) (idx self) i)))) (defobserver .kids ((self treeview-item)) (rearrange-treeview-items self old-value new-value)) (defun find-treeview-item (family idx) (loop for k in (kids family) when (etypecase k (treeview-item (if (string= idx (idx k)) k (find-treeview-item k idx)))) return it)) ;;; ---------------------------------------------------------------------- ;;; ;;; TREEVIEW-HEADING: Interface to the ttk::treeview widget `heading' command ;;; for configuring titles of the multicolumn treeview widget. Each object ;;; represents a heading. This object is in CTK only, not in Tk. This is not ;;; a family model but we fake a fm-parent slot to store the parent treeview. ;;; (defmodel treeview-colspec-mixin () ((treeview :initform nil :initarg :fm-parent :accessor fm-parent) ;evil (column :initform nil :initarg :treeview-column-id :accessor treeview-column-id))) (deftk treeview-heading (tk-object treeview-colspec-mixin) () (:tk-spec treeview-heading -text -image -anchor -command) (:default-initargs :id (gentemp "TVH"))) (defmethod make-tk-instance ((self treeview-heading)) (assert (^treeview-column-id) () "~a: currently cannot make ~a without specifying column id." (tk-class self) self) (tk-format `(:post-make-tk ,self) "~a heading ~a ~{~(~a~) ~a~^ ~}" (path .parent) (^treeview-column-id) (tk-configurations self))) (defmethod tk-configure ((self treeview-heading) option value) (assert (path .parent) () "~a: cannot configure heading ~a without parent." self) (assert (^treeview-column-id)) (assert (find (^treeview-column-id) (column-ids .parent) :test #'equal)) (tk-format `(:configure ,self ,option) "~a heading ~a ~a ~a " (path .parent) ;; (^treeview-column-id) (down$ option) (tk-send-value value))) ;;; ---------------------------------------------------------------------- ;;; ;;; TREEVIEW-COLUMN. Interface to the ttk::treeview widget `column' command ;;; for configuring columns of the multicolumn treeview widget. Each object ;;; represnts a column. This object is in CTK only, not in Tk. This is not a ;;; family model but we fake a fm-parent slot to store the treeview. -id is a ;;; readonly option of the command, so we do not specify it in tk-spec. ;;; (deftk treeview-column (tk-object treeview-colspec-mixin) () (:tk-spec treeview-column -anchor -minwidth -stretch -width) (:default-initargs :id (gentemp "TVC"))) (defmethod make-tk-instance ((self treeview-column)) (assert (^treeview-column-id) () "~a: currently cannot make ~a without specifying column id." (tk-class self) self) (tk-format `(:post-make-tk ,self) "~a column ~a ~{~(~a~) ~a~^ ~}" (path .parent) (^treeview-column-id) (tk-configurations self))) (defmethod tk-configure ((self treeview-column) option value) (assert (path .parent) () "cannot configure heading ~a without parent." self) (assert (^treeview-column-id)) (assert (find (^treeview-column-id) (column-ids .parent) :test #'equal)) (tk-format `(:configure ,self ,option) "~a heading ~a ~a ~a " (path .parent) (^treeview-column-id) (down$ option) (tk-send-value value))) ;;; ---------------------------------------------------------------------- ;;; ;;; TREEVIEW: ttk::treeview - Hierarchical multicolumn data display widget. ;;; Kids of a treeview object are treeview-item objects. Use column-ids to ;;; specify column identifiers. The values-lst of a treeview-item object is a ;;; list of data values, each in a one to one correspondance with column ;;; identifiers in column-ids. The on-XXX commands of treeview-item are ;;; invoked in response to treeview virtual events. Each on-XXX command is ;;; either nil or a function which takes a single argument, a treeview-item ;;; object. ;;; (deftk treeview (widget) ((treeview-headings :initform nil :accessor treeview-headings :initarg :treeview-headings) (treeview-columns :initform nil :accessor treeview-columns :initarg :treeview-columns)) (:tk-spec treeview (ttk-class -class) -cursor -takefocus -style -xscrollcommand -yscrollcommand ; TODO (column-ids -columns) -displaycolumns -height -width -padding -selectmode -show) (:default-initargs :id (gentemp "TVIEW") :on-command #'treeview-on-command)) (defmethod make-tk-instance ((self treeview)) (setf (gethash (^path) (dictionary .tkw)) self) (tk-format `(:make-tk ,self) "ttk::treeview ~a ~{~(~a~) ~a~^ ~}" (^path) (tk-configurations self)) (tk-format `(:pack ,self) "pack ~a -expand yes -fill both" (^path)) (tk-format `(:bind ,self) "bind ~a <<TreeviewOpen>> {do-on-command %W OPEN [%W focus]}" (^path)) (tk-format `(:bind ,self) "bind ~a <<TreeviewClose>> {do-on-command %W CLOSE [%W focus]}" (^path)) (tk-format `(:bind ,self) "bind ~a <<TreeviewSelect>> {do-on-command %W SELECT [%W selection]}" (^path))) (defobserver .kids ((self treeview)) (rearrange-treeview-items self old-value new-value)) (defun treeview-on-command (self event target) (trc nil "treeview-on-command self event target" self event target) (cond ((string= event "OPEN") (bwhen (target-item (find-treeview-item self target)) (bwhen (cmd (on-open target-item)) (funcall cmd target-item)))) ((string= event "CLOSE") (bwhen (target-item (find-treeview-item self target)) (bwhen (cmd (on-close target-item)) (funcall cmd target-item)))) ((string= event "SELECT") (loop for target in (parse-tcl-list-result target) do (bwhen (target-item (find-treeview-item self target)) (bwhen (cmd (on-select target-item)) (funcall cmd target))))))) #+nil (test-window 'window t :title$ "Test-tree-view" :height (c-in 200) :width (c-in 200) :kids (c? (the-kids (mk-treeview :displaycolumns "\#all" :column-ids '("COL1XYZ" "COL2ABC" "COL3") :treeview-headings (c? (the-kids (mk-treeview-heading :treeview-column-id "\#0" :text "Name") (mapcar (lambda (c) (unless (stringp c) (setq c (princ-to-string c))) (mk-treeview-heading :treeview-column-id c :text c)) (^column-ids)))) :treeview-columns (c? (the-kids (mk-treeview-column :treeview-column-id "\#0" :stretch "0" :width 100) (mapcar (lambda (c) (mk-treeview-column :treeview-column-id c)) (^column-ids)))) :kids (c? (the-kids (mk-treeview-item :text "root1" :openp t :on-select (lambda (s) (warn "select ~S" s)) :values-lst '("foo1" "bar1" "car1") :kids (c? (the-kids (mk-treeview-item :text "level1 A" :values-lst '("foo2" "bar2" "car2") :kids (c? (the-kids (mk-treeview-item :text "level2" :values-lst '("foo3" "bar3" "car3"))))) (mk-treeview-item :text "level1 B" :values-lst '("foo4" "bar4" "car4"))))) (mk-treeview-item :text "root2" :values-lst '("foo5" "bar5" "car5")))))))) ;;; ---------------------------------------------------------------------- ;;; ;;; DIRTREE: TREEVIEW DEMO ;;; (in-package "CTK") (defun dirtree-directory-p (p) "Return non-nil if directory." (and (not (stringp (pathname-name p))) (not (stringp (pathname-type p))))) (defun dirtree-expand (p) "Return a list of enrtries in directory p." (when (dirtree-directory-p p) (directory (make-pathname :name :wild :version :wild :type :wild :defaults p)))) (defun dirtree-format-date (utime &optional tz) "Return a Human readable date string" (multiple-value-bind (second minute hour date month year day daylight-p zone) (if tz (decode-universal-time utime tz) (decode-universal-time utime)) (when daylight-p (decf zone)) (format nil "~a ~a ~2,' d ~2,'0d:~2,'0d:~2,'0d ~4d ~?" (ecase day (0 "Mon") (1 "Tue") (2 "Wed") (3 "Thu") (4 "Fri") (5 "Sat") (6 "Sun")) (ecase month (1 "Jan") (2 "Feb") (3 "Mar") (4 "Apr") (5 "May") (6 "Jun") (7 "Jul") (8 "Aug") (9 "Sep") (10 "Oct") (11 "Nov") (12 "Dec")) date hour minute second year "~:[+~;-~]~2,'0d~2,'0d" (multiple-value-bind (hour min) (truncate zone 1) (list (plusp zone) (abs hour) (* 60 (abs min))))))) (defmd dirtree-node (treeview-item) (my-pathname nil) (expandedp (c-in nil)) (directoryp nil) :kids (c-in nil) :on-open (lambda (self) (warn "XXX open ~S" self) (unless (^expandedp) (warn "XXX populating ~S: ~S" self (^my-pathname)) (setf (kids self) (dirtree-make-kids self) (^expandedp) t)))) (defmd dirtree (treeview) :column-ids '("ABSOLUTE-PATHNAME" "SIZE" "DATE") :displaycolumns '("SIZE" "DATE") :treeview-headings (c? (the-kids (mk-treeview-heading :treeview-column-id "#0" :text "Directory Structure") (mk-treeview-heading :treeview-column-id "SIZE" :text "File Size") (mk-treeview-heading :treeview-column-id "DATE" :text "Write date (utime)"))) :kids (c? (the-kids (make-kid 'dirtree-node :text "/" :my-pathname #p"/" :openp t :kids (c? (the-kids (dirtree-make-kids self))))))) (defun dirtree-values-lst (p) "Return a list of values to be displayed for entry p" (list p (ignore-errors (with-open-file (stream p) (file-length stream))) (bwhen (utime (file-write-date p)) (dirtree-format-date utime)))) (defun dirtree-make-kids (self) (let ((ret (loop for p in (dirtree-expand (etypecase self (dirtree-node (my-pathname self)) (dirtree #p"/"))) for directory-p = (dirtree-directory-p p) collect (make-instance 'dirtree-node :directoryp directory-p :fm-parent self :my-pathname p :text (if directory-p (concatenate 'string (car (last (cdr (pathname-directory p)))) "/") (file-namestring p)) :openp (c-in nil) :values-lst (dirtree-values-lst p))))) #+HOWTO ;; populate the directories show they show a dummy expansion (map nil (lambda (x) (when (directoryp x) (setf (kids x) (list (make-instance 'dirtree-node :fm-parent x :text "dummy"))))) ret) ret)) #+nil (test-window 'window t :title$ "DIRTREE: TREEVIEW TEST" :height (c-in 200) :width (c-in 200) :kids (c? (the-kids (make-kid 'dirtree))))

2 7

Re: [cells-devel] PLT-Scheme cells?
by Stefano Dissegna 06 Sep '08

06 Sep '08

2008/9/4 Kenny Tilton <kennytilton(a)optonline.net> > Stefano Dissegna wrote: > >> I didn't actually tried this, but it looks very similar to cells. What do >> you think? >> >> http://docs.plt-scheme.org/frtime/index.html >> > > Yep, same idea. Looks like a pain, tho, all this business about "lifting". > > kt > > > -- > http://www.theoryyalgebra.com/ I've read more about FrTime, and the big difference with Cells is that in FrTime *every* value acts as an input cell and every expression is a formula, i.e. everything is built-in, because FrTime redefines all scheme's primitives (this seems quite too intrusive to me). To avoid performance issues, there is an optimizer that "unlifts" constant values and expressions. Another difference is that FrTime is not tied to an OO system.

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