einstein | Simple , safe arithmetic parser for Ruby | Parser library
kandi X-RAY | einstein Summary
kandi X-RAY | einstein Summary
The Einstein library provides a simple arithmetic parser for Ruby apps. Sure, you could just use eval, but then you’re opening yourself up to a world of hurt when you accept code from untrusted sources (ie. your users). With Einstein, you get a safe, "locked-down" arithmetic parser and evaluator that can’t run system commands or otherwise hose your server in the event of a malicious code snippet. Einstein was built as an excercise in language parsing in Ruby. I’m releasing it in the hopes that someone will find the code useful, or learn something from it…or, better yet, teach me a thing or two about writing parsers :-P.
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Top functions reviewed by kandi - BETA
- Takes a string and returns an array of tokens .
- Processes the sexp .
- Load a scan file
- Scan the specified file .
- Scan the given string .
- Processes a resolve scope
- Processes one or more processing
- Retrieve the next token
- Reduces the result with the given values .
- Generate a binary string
einstein Key Features
einstein Examples and Code Snippets
def einsum(equation, *inputs, **kwargs):
r"""Tensor contraction over specified indices and outer product.
Einsum allows defining Tensors by defining their element-wise computation.
This computation is defined by `equation`, a shorthand form ba
Community Discussions
Trending Discussions on einstein
QUESTION
I got two unquoted and single column TSV files (exported from a database) with a few thousand people names and I need to find the names that appear in both files. Both files are UTF-8
, CRLF
terminated, and start with the BOM 0xEF 0xBB 0xBF
.
A simple join
or comm
command could have done the trick but there are a few differences in the names:
ANSWER
Answered 2022-Feb-14 at 13:10How about agrep
? man agrep
: agrep - search a file for a string or regular expression, with approximate matching capabilities. It's not perfect like we will see:
QUESTION
I'm 100% sure from testing that for loop does iterate through characters how is it suposed to, but the other part of the program isn't working correctly. Im trying with if statement to print only uppercase characters.
Here are some input/output samples to get a better pitcure what this program is about:
Input: Tim-Berners-Lee
Output: TBL
Input: Albert-Einstein
Output: AE
Here is the code:
...ANSWER
Answered 2022-Mar-21 at 06:51Your code will calculate compare name[i] == 'A'
first and then take
the result to do OR operation with 'B'
, 'C'
, and so on..., which absolutely won't work.
You should do name[i] == 'A' || name[i] == 'B' || ...
or just use std::isupper()
.
QUESTION
I wanted to make a portfolio with card filter effect (to show only relevant cards to a selected category when click a button and to hide other none relevant cards) For that I categorized cards in to 2 categories(classes) as books and articles.
when I click the button "articles" the .show cards are remaining in their original place in the grid (UI) and .hide cards spaces in the UI looks blank rather than re arranging .show cards to fill the gaps.
So need to make show cards to auto arrange without showing empty spaces in (UI).
...ANSWER
Answered 2022-Mar-16 at 19:16The JavaScript part is okay but you've added the target classes to the wrong elements. You should add the classes that you're targeting (.all
, .books
, .articles
) to the .portfolio-item
element instead.
Example: Change
QUESTION
I can scripe a wikipedia usein wikipedia api
...ANSWER
Answered 2022-Mar-12 at 07:39You don't want to call re
twice, but rather iterate directly through the results provided by regex_result
. Named groups in the form of (?P...)
make it even easier to extract the header name without the surrounding markup.
QUESTION
I am using bootstrap select in my page and I need it to be empty by default (and value="")
when the page loads (it is a required field so when the user submits the form, the validation message will appear in case it's empty).
It actually works but it looks weird/odd/too flat:
And this would be the desired result:
I have used this attribute to make the select look empty: data-none-selected-text=""
and it actually looks empty but too flat.
If I remove that attribute, I'll get this Nothing selected
placeholder which I don't want:
How can I make the design consistent and keep the same size whether something is selected or not?
...ANSWER
Answered 2022-Feb-01 at 16:52You can overwrite default bootstrap class and make an exception for this scenario.
QUESTION
I have simple json what i read with pandas
:
ANSWER
Answered 2022-Jan-27 at 10:26If I understand correctly, you want to apply a function to the students
column that 'flattens' the list of dictionaries into a string, right?
QUESTION
I am building my own carousel from scratch and everything works perfectly fine except for when you click the navigation circles.
If you have the interval/infinite loop prop, the circles update to the correct active slide and the same goes for pressing the side left and right buttons. However, when I click the circles directly, things get all messed up and the carousel breaks.
It obviously has something to do with the switchSlide
function I've written for that action, but I cannot figure it out for the life of me.
Any help or advice would be greatly appreciated!
Cheers!
Here is the Codesandbox I've made
NOTE: I just put the index inside of each circle just to maake sure the proper amount were rendering.
Carousel.vue
...ANSWER
Answered 2021-Dec-19 at 10:03Try to change method call, from:
QUESTION
The parent url got multiple nodes (quotes), each parent node got child url (author info). I am facing trouble linking the quote to author info, due to asynchronous nature of scrapy?
How can I fix this issue, here's the code so far. Added # <---
comment for easy spot.
ANSWER
Answered 2021-Nov-22 at 13:09Here is the minimal working solution. Both type of pagination is working and I use meta keyword to transfer quote item from one response to another.
QUESTION
Here is my code:
...ANSWER
Answered 2021-Nov-19 at 02:07With your code
QUESTION
I'm trying to map through object values and add text if the key is right on JavaScript. Here is our object:
...ANSWER
Answered 2021-Oct-31 at 04:13You don't need to use Object.fromEntries()
, instead, you make your function return a new object, with a transformed className
based on the return value of fn
. You can then set the children:
key on the object to be a mapped version of all the objects inside of the children array. When mapping, you can pass each child into the recursive call to your addToClassName()
function. You can add the children
key conditionally to the output object but checking if it exists (with children &&
) and then by spreading the result using the spread syntax ...
:
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Install einstein
On a UNIX-like operating system, using your system’s package manager is easiest. However, the packaged Ruby version may not be the newest one. There is also an installer for Windows. Managers help you to switch between multiple Ruby versions on your system. Installers can be used to install a specific or multiple Ruby versions. Please refer ruby-lang.org for more information.
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