peg | A PEG parser written in PHP | Parser library
kandi X-RAY | peg Summary
kandi X-RAY | peg Summary
Of course, using arrays to define the grammar is really ugly. This is why PEG comes with PegGrammar, a parser that is able to parse PEG syntax. It returns a ready to use grammar instance using the parsed grammar. For information about the PEG syntax, see [Parsing Expression Grammars: A Recognition-Based Syntactic Foundation] by Bryan Ford.
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Top functions reviewed by kandi - BETA
- Parse a repeat expression .
- Parse a sequence .
- Creates an undefined definition .
- Flatten a multi - dimensional array .
- Call the action .
- Parse input .
- Creates a new expression
- Creates a new match instance .
- Creates an invalid definition .
- Get the unique identifier .
peg Key Features
peg Examples and Code Snippets
Community Discussions
Trending Discussions on peg
QUESTION
I am working on a simple 2D peg-in-hole example in which I want to directly control the peg (which is just a box) in 2D. In order to do that, I add a planar joint to attach the peg to the world as in the Manipulation course's example.
...ANSWER
Answered 2022-Mar-15 at 09:34Right now you have to add the prismatic and revolute joint's yourself to add actuators. Here is a snippet from https://github.com/RussTedrake/manipulation/blob/f868cd684a35ada15d6063c70daf1c9d61000941/force.ipynb
QUESTION
I am trying to do something very simple with PIXI and Typescript. I decided to switch to using texture packer from loading individual png files and ran into this issue. The issue is when trying to access the texture that is loaded through the spritesheet json file I get a promise error. The code is very simple and I have tried various ways of doing this with no luck. This example is the simplest and uses the example from CodeAndWeb (Texture packer devs site) but in an attempt to translate it to typescript and separated the functionality a bit. Any advice is highly appreciated. Thanks.
Code Sandbox here: https://codesandbox.io/s/empty-hooks-9g8j6?file=/src/index.ts
...ANSWER
Answered 2022-Mar-15 at 14:11For anyone who comes across this question, I've had the exact same error. It was hard for me to find solutions on StackOverflow, but in the end, I figured it out.
First, if you want to use a public server, it'll have to have CORs enabled. Then, it should work fine.
If you want to use an image hosted on a local server (e.g. using the http-server
package to run a local file repository), for the image source, you'll have to use the full link – e.g. http://127.0.0.1:8001
instead of something like localhost:8001
, which won't work. You'll also have to enable the CORs option (for instance, for http-server
, that would mean adding the --cors
flag)
QUESTION
I have a DataFrame column with 3 values - Bart, Peg, Human. I need to one-hot encode them such that Bart and Peg stay as columns and human is represented as 0 0.
...ANSWER
Answered 2022-Mar-07 at 17:31IIUC, try use get_dummies then drop 'Human' column:
QUESTION
I'm a newbie to Ruby programming. It is my second OOP project. I have trouble with counting white pegs under certain condition. And Wikipedia says that:
-A black key peg is placed for each code peg from the guess which is correct in both colour and position.
-A white key peg indicates the existence of a correct colour code peg placed in the wrong position.
I believe that my black peg condition is true, but I can not count my white pegs correctly. Here is the function code piece:
...ANSWER
Answered 2022-Feb-07 at 14:41-A white key peg indicates the existence of a correct colour code peg placed in the wrong position
I found my answer. The white peg code control should be
QUESTION
Printing moving disk from source to destination in TOH( Tower of Hanoi) can easily write in C/C++.(with recursive function) But how can we print index each step ? C code-
...ANSWER
Answered 2022-Jan-05 at 09:57First note that you do not need to printf
something in your else
branch since this is being managed by your recursive function base
case.
To print the index, the easiest solution (if we rule out global
variables) would be to give your recursive function an additional
pointer argument referencing an integer that is the number of lines printed. Each time you
print a line, the integer referenced by this pointer is incremented by 1. This gives function tower_ptr
below:
QUESTION
I was going through the python grammer specification and find the following statement,
...ANSWER
Answered 2021-Nov-19 at 12:30It's documented in PEP 617 under Grammar Expressions:
~
Commit to the current alternative, even if it fails to parse.
rule_name: '(' ~ some_rule ')' | some_alt
In this example, if a left parenthesis is parsed, then the other alternative won’t be considered, even if some_rule or ‘)’ fail to be parsed.
The ~
basically indicates that once you reach it, you're locked into the particular rule and cannot move onto the next rule if the parse fails.
PEP 617 mentions earlier that | some_alt
can be written in the next line.
QUESTION
I want to make a glow effect on the progress bar near the end like https://codepen.io/brundolf/pen/YWEgLJ
I am using NProgress. This is the CSS used to create glow effect:
...ANSWER
Answered 2021-Jul-25 at 12:30Do you want to reuse this later on? If not, why would you even want to convert it to tailwind? Leave it in css.
Anyway, to make tailwind class you need to add this shadow to config, like that:
QUESTION
I have a pie chart given by the following code
...ANSWER
Answered 2021-Nov-23 at 13:59You can actually redefine the label to whatever you want:
QUESTION
I want to port in serde_json
through cucumber. gherkin_rust
v0.10.1 lists it under "[build-dependencies]". How do I access it without adding it to the toml file / using an extern crate call?
ANSWER
Answered 2021-Nov-06 at 20:51You can not access to it through another crate unless that other crate reexports it publicly (ex pub use::cool_crate
).
Just add whatever you need to your Cargo.toml
. Notice that dependencies are not used more than once, so there should not be any difference but the usage through namespacing.
QUESTION
I want to handle string starts with number
using pegjs. When I input with 1abcd it throws Expected [0-9.] or end of input but "a" found.
. The expected output is { item: '1abcd', case: '=' }
. What changes do I need?
ANSWER
Answered 2021-Oct-18 at 15:19Since NUMBER
matches the first character, you'll want to use a negative lookahead for STRING
before returning a successful match. That way, if a STRING
character is encountered, the NUMBER
rule will fail and the second alternation of start
will be used.
Here's an example, although as @thinkgruen has written, you'll probably want to try to parse floats less loosely as well.
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