World: r3wp
[Parse] Discussion of PARSE dialect
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BrianH 8-Nov-2008 [2990] | I was not putting my name everywhere on those proposals. I only put my name on the proposals I came up with personally, including proposals from the REPs that I came up with during the conversations that led up to the REPs being collected. The issues that I say have been resolved were resolved in conversations with Carl earlier this week. We had already been discussing these problems for a couple days before you joined in. |
Steeve 8-Nov-2008 [2991] | ok it is only that the decision process seemed a bit opaque |
BrianH 8-Nov-2008 [2992x3] | Almost all of the proposals in the Parse Proposals page are derived from Gabriele's parse REPs page. Most of the subsequent requests were covered by one or more of those REPs. We had a pretty exhaustive discussion about the subject years ago and PARSE hasn't changed since, so its problems and limitations have been mostly the same. |
I am not being pretentious - I really did come up with those proposals on my own before the first comment was made to the blog or here. I have been asking for more proposals but so far there haven't been that many that weren't already covered. And it is not a problem for me to reject proposals - it is my job. I've already pushed through more proposals than Carl is comfortable with, but I have hope that they will be accepted. Please give more suggestions, but consider that they will be debated before they will be accepted. Only the best would even be considered by Carl (he's got more stringent standards than mine). | |
The final decisions are made by Carl. He's the language director and he'll be implementing this stuff. If he say it can't happen, it can't happen. If I say that it can happen later when another feature is added, you can be sure that I have already figured out how to do so - I wouldn't say otherwise. | |
Steeve 8-Nov-2008 [2995] | do you mean that only accepted proposals by Carl are in the wiki ? i tought that all the ideas could be inserted in the wiki not only those accepted |
BrianH 8-Nov-2008 [2996x3] | Even those haven't been accepted yet. He hasn't even accepted his own ideas - they need more work. |
However, every proposal in the wiki through REVERSE has been reviewed and discussed by Carl and were only added after he liked them. The latter ones were added the next day, based on my own ideas and those of Peter Wood. | |
I have run out of ideas, and am asking for more. Through discussions with Carl I have a pretty good idea about what would be rejected, and what has already been rejected. If you want to make more suggestions, please review the proposals that have been made already in the Parse Proposals wiki and Gabriele's REPs. If your suggestion is covered by something suggested in one of those places you can be sure that they have already been debated to death. If not, I'd love to hear it :) | |
Steeve 8-Nov-2008 [2999x2] | ok i try again a new proposal: ALL [rule1 | rule2 | rule3] each rule must be fullfiled one time but in any order (combinatory). it's equal to [[rule1 rule2 rule3] | [rule1 rule2 ruel3] | [rule2 rule1 rule3] etc...] |
it's not an abstract idea, i had the case in some srcipts | |
BrianH 8-Nov-2008 [3001x2] | Interesting! It sounds like it is related to OF, Carl's idea to replace DELECT. That would be useful for making DELECT-style dialects without the parameters being optional. How important is it that the parameters be mandatory? |
By the way, Carl has already decided that REP 11 will take the form of the USE proposal. The RULE! type will have to wait for UDTs. | |
Steeve 8-Nov-2008 [3003] | Brian, OF optionnal parameters can be constructed using ALL like this: ALL [rule1 | rule2 | opt rule3] so ALL, is more generalist |
BrianH 8-Nov-2008 [3004] | That sounds good to me. OF is not set in stone yet, so that should definitely be brought up. Good idea :) |
Graham 8-Nov-2008 [3005] | quickie ... will words set by parse go into a global context still? |
BrianH 8-Nov-2008 [3006] | Yes, but you will be able to make recursion-safe local words with USE. |
Graham 8-Nov-2008 [3007] | and will we be able to do things like [ copy obj/var to something ] |
BrianH 8-Nov-2008 [3008] | That sounds like a good idea too. |
Graham 8-Nov-2008 [3009] | part of constructing objects while parsing |
BrianH 8-Nov-2008 [3010] | If you don't know what the field will be, you might want to append to the object instead in a paren. Setting obj/var only works if there is already an var field in obj, but append will work even if there isn't. |
Graham 8-Nov-2008 [3011] | mostly I want to collect all the data into a predefined object |
Steeve 8-Nov-2008 [3012] | but if you do that you must limit the behaviour of INTO. currently INTO enter in paren! path! and block!. if think it's to versatile |
Graham 8-Nov-2008 [3013] | to reduce the number of variables I work with |
Steeve 8-Nov-2008 [3014] | INTO sh |
Graham 8-Nov-2008 [3015] | so, for the latter situation ... [ append obj/var to something ] will allow me to build the object? |
BrianH 8-Nov-2008 [3016] | Steeve, have you looked at the INTO parse proposal on the wiki? It's at the end. It's my favorite, if only because of the example :) |
Steeve 8-Nov-2008 [3017x2] | the INTO/string, yes i always tought it was an excellent idea Brian |
ah ok it's covering my request | |
BrianH 8-Nov-2008 [3019x2] | The INTO and CHANGE proposals were made after I checked with Carl that keyword modifiers were workable. |
That reminds me, I have a few edits to make. | |
Steeve 8-Nov-2008 [3021x2] | ah i feel better |
after a good beer | |
BrianH 8-Nov-2008 [3023] | Check the page again - you're on it (INTO proposal). |
Steeve 8-Nov-2008 [3024] | haha seriously, u can't credit me on that, you had already done the proposal. But i will accept the credit if Carl accept the ALL ehancement ;-) |
BrianH 8-Nov-2008 [3025x2] | More names are good. (check private chat) |
I'm serious about attribution here. I didn't attach my name to any proposal I didn't come up with. | |
Steeve 8-Nov-2008 [3027x3] | check private chat, plz |
here we go for proposals | |
Brian i hear you ;-) | |
BrianH 8-Nov-2008 [3030x2] | It occured to me (as I'm sure that it has occured to others) that it is possible for parse rules to do one bad thing even if you exclude all of the modification statements, word setting statements, and parens: ANY and SOME can go into infinite loops if they don't advance the position. I would like to propose that there be some form of warning or error if SOME or ANY loop again on the same position they did last time. This condition should be screened for with a PARSE refinement. If the refinement is set then when the point is reached where ANY or SOME would repeat at the same position, the rule would fail (and possibly backtrack to the next alternate). |
Maybe that and a few other restrictions could be enabled when a /safer refinement is used. | |
Steeve 8-Nov-2008 [3032] | i'm thinking... |
BrianH 8-Nov-2008 [3033x3] | Because of get-words there may be times where you don't want the position to advance, so this would have to be an option rather than standard behavior, or it would be a backwards compatibility problem that might not be worth it. |
The way the new behavior would be formulated is this: ANY or SOME would only succeed if one of these conditions happened: - The rule argument fails (after the first round for SOME). - The rule argument succeeds *and* the position changes. | |
I'm not sure how REVERSE would fit in, but it sounds workable so far... | |
Steeve 8-Nov-2008 [3036x2] | i never had such a case. I don't really see your point. When all rules failed in an ANY block, then we have a break |
it's the responsability of sub-rules to do some skip to avoid such cases | |
BrianH 8-Nov-2008 [3038] | Ah, but if one of the rules succeeds but doesn't advance the position (like NONE), you get an infinite loop. |
Steeve 8-Nov-2008 [3039] | yes but who do such things ? |
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