Parser-Combinators | C parser combinator library | Parser library
kandi X-RAY | Parser-Combinators Summary
kandi X-RAY | Parser-Combinators Summary
the latest version now supports functionality equivalent to an attribute grammar, where the parser result (synthesized attribute) is returned bottom up, and state (inherited attribute) is threaded trough the parsers accumulating values left-to-right. this needs some care to interact with backtracking, as the state needs to be backtracked as well. the attempt parser combinator deals with saving the current result and state and restoring it on backtracking, but this relies on the state being copyable. if there is only single-character look-ahead failed parsers do not consume characters, and so backtracking is unnecessary, and the state does not need to be copyable.. a high performance c++ parser combinator library, focusing static instantiation of combinators, which differentiates it from other libraries such as boost.spirit. the library design ensures that all combinator composition occurs at compile time, with a special construct (a parser-handle) used to allow dynamic runtime polymorphism at specific points. as backtraking is supported, parsers can generally consist of a set of independent static parse rules, and a single parser-handle to enable polymorphic recursion. however higher level parser combinators
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QUESTION
My question is how do I access DownloadFiles.fileURLList property in sbt console (Scala REPL)?
I created a SBT Scala project and have this code at src/main/scala/DownloadFiles.scala
ANSWER
Answered 2021-Apr-02 at 13:10The first part of your code uses a variable called fileURLList. The second part of your code and your SBT command use imageURLList. imageURLList is never declared as a variable, therefore it is null. Find and replace your code from fileURLList to imageURLList and I bet it will do what you were expecting.
I am a little surprised you didn't get other errors though.
QUESTION
I am getting the following error when attempting to run sbt run
to run my Scala code:
insecure HTTP request is unsupported 'http://repo.typesafe.com/typesafe/releases'; switch to HTTPS or opt-in as ("typesafe-releases" at "http://repo.typesafe.com/typesafe/releases").withAllowInsecureProtocol(true), or by using allowInsecureProtocol in repositories file
This is strange because it was working perfectly fine last week and I have changed nothing in the code. I have tried adding ("typesafe-releases" at "http://repo.typesafe.com/typesafe/releases").withAllowInsecureProtocol(true)
in my build.sbt
file and resolver file, installing Java11, deleting my project folder, and completely reclone my code from the repository but nothing is working. I am using Visual Studios but have also tried on IntelliJ and get the same error.
Any advice would be greatly appreciated, as I have changed nothing and now suddenly my code doesn't compile anymore. Further details:
sbt.version = 1.4.0
Scala code runner version 2.12.10
My current built.sbt (please note that I did not have the resolve part added before, when my code was working fine. It was added as an attempt to resolve the issue but did not work):
...ANSWER
Answered 2020-Nov-24 at 15:49As mentioned in repo.typesafe.com, you can add to your sbt:
QUESTION
I am having difficulty getting my Eclipse PDE plugin to work in a Windows environment. I have created an Eclipse PDE plugin that uses external jars. I was able to install the plugin to my Eclipse IDE on my MacBook (macOS Catalina 10.15), by right clicking on the project then Export>Deployable plugins and Fragments>Install into host repository>Finish. The pathway for the host repository is /Users/username/eclipse-workspace/.metadata/.plugins/org.eclipse.pde.core/install/
. The attributes chosen in the Options category are shown in the photo below:
The plugin installs successfully and is able to run in my IDE upon button click.
When I repeat these steps in Windows 10, the plugin installs. I am able to click on a button to open my developed window, but when I click the "go" button which triggers my functions that rely on the external jars, nothing occurs. The button acts as though it is not connected to any function, despite the code being identical to what was used in Mac. Does anyone know why Eclipse is unable to access the necessary jars in Windows?
I have attached a screenshot of my build properties below. Note that the jars are held in a directory called "lib" which is at the same level as the /src directory in a eclipse plugin project.
...ANSWER
Answered 2020-Jul-30 at 20:33Update: the issue appeared to be with the windows computer I was using. The plugin installed as intended with this code on another windows machine.
QUESTION
The documentation for Text.Megaparsec.Char.Lexer.charLiteral
suggests using char '"' *> manyTill charLiteral (char '"')
for parsing string literals (where manyTill
is defined in the module Control.Applicative.Combinators
in the parser-combinators
library).
However, Control.Applicative.Combinators
also defines between
, which -- as far as I can see -- should do the same as the above suggestion when used like so: between (char '"') (char '"') (many charLiteral)
.
However, using the between
parser above does not work for parsing string literals -- failing with "unexpected end of input.
expecting '"' or literal character" (indicating that the ending quote is never detected). Why not?
Also, more generally, why isn't between pBegin pEnd (many p)
equivalent to pBegin *> manyTill p pEnd
?
ANSWER
Answered 2020-May-06 at 09:19between l r m
doesn't do anything spectacular, it really just tries l
then m
then r
and gives back the result of m
. So, in between (char '"') (char '"') (many charLiteral)
, the many charLiteral
doesn't know it's not supposed to consume the "
. The many
just keeps consuming whatever its argument parser accepts... which, because charLiteral
just accepts anything, means it churns right through everything until the end of the input. The second char '"'
has no way of stopping this, it just needs to make do with what's left... i.e., fail because there is nothing left!
By contrast, manyTill
actually checks whether the “till”, matches, and only applies each iteration of the content parser when it doesn't. Therefore, the terminating "
is not passed to charLiteral
, and you get the desired behaviour.
QUESTION
is there any way to exclude dependencies used during test goal?
For example I would like to avoid having all *:tests
jar printed by mvn dependency:tree
.
ANSWER
Answered 2020-Apr-14 at 23:56You can add the scope
like this:
QUESTION
I'm beginner in scala and looking at this tutorial : http://enear.github.io/2016/03/31/parser-combinators/
Event it is explained just below :
The ^^ operator acts as a map over the parse result. The regex "[a-zA-Z_][a-zA-Z0-9_]*".r is implicitly converted to an instance of Parser[String], on which we map a function (String => IDENTIFIER), thus returning a instance of Parser[IDENTIFIER].
I dont understand this code snippet :
...ANSWER
Answered 2020-Mar-23 at 11:24It defines the operation that needs to be performed when the left-hand side expression is evaluated.
For instance, we have some code like this:
QUESTION
A type incompatibility occurred while executing com.cerner.clinicaldev:gatling-plugin:1.0.0-SNAPSHOT:run: org.slf4j.impl.SimpleLoggerFactory cannot be cast to ch.qos.logback.classic.LoggerContext
I am writing a maven mojo that spins up a Jetty implementation and runs Gatling programmatically. I have tried excluding slf4j from the io.gatling:gatling-app:2.2.5 and including in the maven-enforcer-plugin as a banned dependency all no no avail.
I cannot see anywhere else in the dependency tree that includes it;
...ANSWER
Answered 2017-Jul-17 at 05:58Trying add bellow dependency which included logback-classic
QUESTION
I'm working on a rather big project. I need to use azure-security-keyvault-secrets, so I added following to my pom.xml file:
...ANSWER
Answered 2019-Dec-27 at 18:36So I managed to fix the problem with the maven-shade-plugin. I added following piece of code to my pom.xml file:
QUESTION
I see a couple other people with the same issue however none of the solutions worked for me. The following commands+outputs are mainly what I have tried. I am posting 1) because I have been stuck on this for some time and 2) I wanted to leave a comment on another post but I have no reputation :(
I have reinstalled my os (arch linux), keeping only my home files however I deleted .stack, .ghc, and .cabal folders.
yay -S xmonad xmonad-contrib
stack install xmonad xmonad-contrib
sudo ghc-pkg recache
xmonad --recompile
:
ANSWER
Answered 2019-Dec-23 at 11:38Sounds like an issue with cabal - I think there are some packaging difficulties on Arch Linux.
As an alternative, you can manually build a Haskell project with your specific xmonad config, once you know this builds correctly, you can create a ~/.xmonad/build
shell file, and in here trigger a build to your xmonad config/application.
So the contents of build
might be:
QUESTION
I should starting a .jar
several times like this
ANSWER
Answered 2018-Mar-11 at 12:08You could make your program receive a file as an argument and read it. The file would have one or more lines depending the number of arguments you'd like to pass to the program.
Your program would need to receive the file and parse it line by line.
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