I find that ,to generate a calculator ,I only need to write .jj file.
The calculator is the only example I studied,So hopefully if you can provide me some simple examples of JJTree..Thank you :)
Is it right that jjtree provide the container-class for the result of .jj?
Use a JJTree file if you want to build a tree structure during parsing and you accept JJTree's way of doing that. A JJTree file will generally be much less cluttered with semantic actions than a JavaCC file. The price you pay is that you have less control over the form of the tree nodes.
I'd suggest looking at some of the JJTree tutorials that are out there. Google "JJTree tutorial".
Related
we have a larger dataset and have several preprocessing scripts.
These scripts alter data in place.
It seems when I try to register it with dvc run it complains about cyclic dependencies (input is the same as output).
I would assume this is a very common use case.
What is the best practice here ?
Tried to google around but i did not see any solution to this (besides creating another folder for the output).
Usually, we split input and output into separate files rather than modify everything in place, not only for the separation of concerns principles but also to make it fit with tools like DVC.
Hope you can try this way instead.
I am using robot framework with RIDE, and for a test I need to find a XML file on my computer and open it to parse the xml and be able to use the datas.
The thing is that I don't know the exact name of the file; the format is numberNameOfTheFile, so it could be 1NameOfTheFile or 25NameOfTheFile.
How can I use regexp in my keyword? Or any other way to achieve this?
Thank you
How would you do it manually - how would you pick the file to use for the verification?
I presume, you are going to look at all the files that are matching a specific name pattern; in Robot Framework you can do that with OperatingSystem's List Files In Directory keyword, which supports passing a name pattern:
${the files}= List Files In Directory /the/path/to/the/dir *NameOfTheFile.xml
Now you have a list object with the filenames that match; if it's empty - there's no such file, which may be a problem (depends on your test/reqs, I don't know). If it has a single member - great, that's your file.
And if there are multiple files - that's another "problem". How would you pick the right file manually? It could be that the newest file is the target one - for that you would go over all of them and find the one through OperatingSystem's Get Modified Tume; or it can be the largest; or the number in its suffix would be the biggest. This really depends on your requirements, and what you are trying to achieve.
"How would you do it manually" is probably the most important question to ask. Think and break down to steps the individual tasks you would do, and now you have the algorithm; see how to put that in code - and presto, the implementation. This applies to scripts, test cases, and business process automation (e.g. software).
I was tempted to mark the question for closing, because precisely this - the algorithm - was missing, only the end goal is stated - while SO is for helping in the implementation part. But, here we are :)
Im learning how to use QT's translate stuff for the first time for work.
They already have things working to some degree and its my job to clean
things up and get it working properly as well as using lupdate to keep
things in sync when they change etc. We are also using QML in which we
wrote a wrapper function for all our strings, so lupdate does not find
our function to add to the .ts XML file. The reason we use a wrapper is
for centralizing other functions at once place for all strings. We also
dont always use a string literal in our 'source' argument but a defined
property, such as:
property string buttonTxt: "ButtonText"
then: commonTRFunction(context, buttonTxt)
which of course lupdate does not find for both reasons.
Ive looked into updating the lupdate source very briefly
and Im not sure if its worth trying to hack it to find our function or
write our own parser to find the standard QT tags AND also our new ones?
Secondly, and related to the first part, Id like a way to make one
context section that contains all the common words we use in our app
such as 'Back', 'Save', 'Ok' etc etc without repeating it over and over
throughout the .ts file. lupdate seems to repeat things over and over
in multiple contexts which seems both inefficient and a waste of lines
in the ts file.
I haven't found any QT docs that really explain the differences between tr(), qsTr(), qsTranslate(), QT_TR_NOOP() and QT_TRANSLATE_NOOP(). I know you sometimes need a context and the source,
and other times just use the source without a context. We dont use
the disambigous arg. Most of our code is in QML and not C++.
Also we are running lupdate from the command line.
Does anyone have thoughts, suggestions or even a tool someone wrote
that can be used for what we have? I appreciate your help.
I've got a bunch of audio files (let's say ogg or mp3), with metadata.
I wish to read their metadata into R so to create a data.frame with:
file name
file location
file artist
file album
etc
Any way you know of for doing that ?
You take an existing mp3 or ogg client, look at what library it uses and then write a binding for said library to R, using the existing client as guide for that side -- and something like Rcpp as a guide on the other side to show you how to connect C/C++ libraries to R.
No magic bullet.
A cheaper and less reliable way is to use a cmdline tool that does what you want and write little helper functions that use system() to run that tool over the file, re-reading the output in R. Not pretty, not reliable, but possibly less challenging.
Possible, yes, easy, no.
You "could" use a combination of readChar and/or readBin on the file and parse out the contents. This would be highly dependent, though, on parsing the frame tags from the raw bytes of the ID3v2 tag (and mind you it would change if it was a version 1 tag). If would certainly be a lot of work to implement a straight R solution. Take this Python code for example, it's very clean straight python code but a lot of branching and parsing.
You can use exiftool with system command available in R. Optionally, you can create regexp to handle the fields you need... If I were you, I'd stick with Dirk's advice (as usual) =)!
Out here in 2021, I wanted to do this so I did the following...
Create a new playlist while in 'songs' view.
Select all songs and drag to the new playlist. Highlight that playlist
File> Library>Export Playlist. My default file was to save as .txt, if not, designate.
Open Excel to save as csv or read.delim() in r as the txt file is tab-separated
import to R
Is it possible to programmatically generate an info path 2007 form template (xsn file=form definition) ?
I know that there is no object model for the infopath 2007 form designer, but does anyone know of any third party libraries?
The form view itself is a xsl file so it should be possible. I would have thought that its a common use case also.
It is possible to generate the manifest.xsf, xsl and xml files from a structured source (let's say an xml) and then pack this (as .cab) with the extension .xsn
(The .xsn file is nothing but a renemed .cab!)
This is only a raw concept - it could be refined if the purpose was a bit more explicit. Why generate? Are you going to create a bunch of different files? What for?
There are no libraries or API's to do this. While generating a template is possible you will need to write it all yourself. Obviously this will not be an easy task and will be prone to errors. I would recommend reviewing your requirements to ensure this is truly necessary. InfoPath is quite flexible, without knowing the details of your project, there is a good chance you can get the functionality you need with a single template.