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Does anyone out there know about examples and the theory behind parsers that will take (maybe) an abstract syntax tree and produce code, instead of vice-versa. Mathematically, at least intuitively, I believe the function of code->AST is reversible,...
Started by Dervin Thunk on
, 8 posts
by 8 people.
Answer Snippets (Read the full thread at stackoverflow):
I rather like lewap's response:
find a mathematical way to express a visitor and you have a dual to the parser
But you asked... .
Is traverses the tree and does whatever has to be done, for example optimize or generate code .
Such thing is called a Visitor.
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I want to setup a mechanism for tracking DB schema changes, such the one described in this answer :
For every change you make to the database, you write a new migration. Migrations typically have two methods: an "up" method in which the changes are applied...
Started by Panos on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
That said, Rails offers a way to mark a migration .
Migration I've ever done is reversible.
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EDIT: Can anybody actually answer the question? Thanks, I don't need no audit trail, I WILL know all the passwords and users can't change them and I will continue to do so.
This is not for hacking!
We recently migrated away from a old and rusty Linux/...
Answer Snippets (Read the full thread at serverfault):
With all that said, you should not use reversible encryption and you.
Don't enable "reversible to work against those OSes.
With a moderately complex password would be nearly impossible to discover .
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I seem to have faced this problem many times and I wanted to ask the community whether I am just barking up the wrong tree. Basically my question can be distilled down to this: if I have an enum (in Java) for which the values are important, should I be...
Started by Kidburla on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
There's no need for a "reversible map" - the version which takes the month number.
More simply.
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Hey everyone,
One concept I've always wondered about is the use of cryptographic hash functions and values. I understand that these functions can generate a hash value that is unique and virtually impossible to reverse, but here's what I've always wondered...
Started by barfoon on
, 12 posts
by 12 people.
Answer Snippets (Read the full thread at stackoverflow):
Though in theory MD5 is not reversible....
If hash functions such as MD5 were reversible then it would have been a watershed event in the history of data compression algorithms! Its easy to see that if MD5 were reversible.
Freebl library).
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I'd like to store some data in Python in a similar form to a dictionary: {1:'a', 2:'b'} . Every value will be unique, not just among other values, but among keys too.
Is there a simple data structure that I can use to get the corresponding object no matter...
Started by Alex Jurkiewicz on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
Related posts:
Python mapping inverse
Python 1:1 mappings
Of course, if all values and keys are unique, couldn't you just use a single dictionary, and insert both key:value and value:key initially?
Insert reversed pair of (key, value) into same....
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I'm trying to make a function in Python that does the equivalent of compile(), but also lets me get the original string back. Let's call those two functions comp() and decomp(), for disambiguation purposes. That is,
a = comp("2 * (3 + x)", "", "eval")...
Started by Joe on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Something like this:
class CodeObjectEnhanced(object): def __init__(self, *args): self.compiled = compile(*args) self.original = args[0] def comp(*args): return CodeObjectEnhanced(*args)
... .
My approach would be to wrap the code object in another object .
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Nintendo opens up voting for reversible Xenoblade Chronicles cover
Coming from Nintendo's Facebook page... Want to be part of the creative process? Vote here by hitting Like if this is your pick for the collectible reverse cover for Xenoblade Chronicles...
Started by robometal cowboy on
, 19 posts
by 19 people.
Answer Snippets (Read the full thread at gonintendo):
While I love the original box art (which is perfect really), I generally... .
That's some really nice cover art These reversible covers MUST be standard for all Wii U games instead of art? @bellboy I definitely made use of my reversible cover.
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Anyone interested in a new Spring jacket? Pretty colors
http://www.qvc.com/qic/qvcapp.aspx/view.2/app.detail/params.item.A213143.desc.Dennis-Basso-Water-Resistant-Reversible-Solid-to-Print-Jacket
Is this a new pricing platform-Overstock pricing? Kind ...
Started by newlyretired on
, 26 posts
by 7 people.
Answer Snippets (Read the full thread at qvc):
The papaya is quite ....
Dennis Basso coats are what I prefer to wear so I'll have to think about this .
I just checked it out and watched the video where the same price is called 'Clearance' so I think they just reclassified the name .
Thanks for the post.
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I have been looking for some reversible ratcheting wrenches but, do not want gearwrench, or to pay snap-on prices. So I have decided to get a set or two of the Williams wrenches. Has anyone tried these and like them? I probably will get the Williams set...
Started by Sterff on
, 20 posts
by 14 people.
Answer Snippets (Read the full thread at garagejournal):
The only thing I've seen is they are a....
I havent heard him complain about them.
I got the gearwrench reversibles in 8-19mm My Dad has a set of the bluepouint reverseable's.
Almost all the guys at work have the metric sets from blue point .
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