I am using lhs2TeX for my literate Agda files and I'd like them to be syntax highlighted. I know I can achieve some highlighting via %format instructions but that is a bit too much. I have tried using lhs2Tex-hl as instructed at http://foswiki.cs.uu.nl/foswiki/pub/FPOld/CourseLiterature/presentation.pdf but to no avail.
If anyone can help with getting PDF's with coloured Agda, that'd be appreciated!
Edit
The Agda latex backend is great but has some issues. Biggest issue is spec-environment. It says that spec is undefined, so making it a synonym for code should fix things: \newenvironment{spec}{\begin{code}}{\end{code}}, but instead now there are type-checking issues and missing $ errors. Using sed to remove spec blocks altogether results in missing $ errors; likewise \newenvironment{spec}{\verbatim}{\endverbatim}. Similar trouble with using |...|. Also, I honestly liked the %format of lhs2tex ...
Related
The VS Code documentation has a clear if short explanation of how to do custom indentation, but doing this has no effect — whatever I put in the "indentationRules", it fails to match the simplest patterns, and it doesn't even stop the built-in indentation from working, it goes right on using the default indentation described in the link above. All the other bits of the language extension are working, it's not a general problem, it's specific to trying to get these indentation rules to work. I've tried to find examples to copy from the internet but with no success. (I found an example of a grammar for Python but the only mention of indentation in it was as a possible kind of error, which is puzzling.)
Thanks for your help.
With a snippet like
perl6 -e 'loop { FIRST say "foo"; last }'
I get
WARNINGS for -e:
Useless use of LOOP_BLOCK_1 symbol in sink context (line 1)
foo
I know how to work around the warning. I'm wondering about what the source of the warning is. I found this open ticket, but it doesn't seem to have received any attention.
What is this warning about?
And what about this is useless?
Version
$ perl6 --version
This is Rakudo version 2018.06 built on MoarVM version 2018.06
implementing Perl 6.c.
It's a bug, a bogus warning.
I know how to work around the warning.
That's the main thing.
I'm wondering about what the source of the warning is.
It's a bogus warning from the compiler.
I found this open ticket, but it doesn't seem to have received any attention.
I think it got some attention.
bbkr, who filed the bug, linked to another bug in which they showed their workaround. (It's not adding do but rather removing the FIRST phaser and putting the associated statement outside of the loop just before it.)
If you follow the other links in bbkr's original bug you'll arrive at another bug explaining that the general "unwanted" mechanism needs to be cleaned up. I imagine available round tuits are focused on bigger fish such as this overall mechanism.
Hopefully you can see that it's just a bizarre warning message and a minor nuisance in the bigger scheme of things. It appears to come up if you use the FIRST phaser in a loop construct. It's got the very obvious work around which you presumably know and bbkr showed.
What is this warning about?
Many languages allow you to mix procedural and functional paradigms. Procedural code is run for its side effects. Functional code for its result. Some constructs can do both.
But what if you use a construct that's normally used with the intent of its result being used, and the compiler knows that, but it also knows it's been used in a context in which its value will be ignored?
Perls call this "useless use of ... in sink context" and generally warn the coder about it. ("sink" is an alternative/traditional term for what is often called "void" context in other language cultures.)
This error message is one of these warnings, albeit a bogus one.
And what about this is useless?
Nothing.
The related compiler warning mechanism has gotten confused.
The "Useless use of ... in sink context" part of the message is generic and hopefully self-explanatory.
But there's no way it should be saying things like "LOOP_BLOCK_1 symbol". That's internal mumbo-jumbo.
It's a warning message bug.
I try to use an ANTLR plugin for IJ, but there is an annoying problem. I don't know, what I'm doing wrong, but after changing something in lexer grammar besides generating ANTLR recognizer (often, but not always) I have to restart IJ to see the correct parsing tree. Already tried to "Save all" or "Synchronize" before testing parser, but nothing helps. Has anyone encountered such a problem?
Thank you in advance.
As glytching suggested in their comment, this is the problem described in this GitHub issue: https://github.com/antlr/intellij-plugin-v4/issues/242
The solution seems to be to hit Save. Another user also mentions touching the file from the terminal.
This puzzled me, as I'm using PyCharm and the way it seems to be set up by default is to auto-save as you work so I basically never interact with Save explicitly in any way. However, in this case hitting Ctrl+S does seem to make a difference (compared with just letting it auto-save) and it solves the issue for me.
For clarity, my situation is:
I have a grammar broken up into several parts (mixture of lexer, parser and combined grammars) which are imported into the 'main' grammar.
I am working interactively with the ANTLR Preview window (OP mentioned generating a recognizer, but I think this issue is completely independent of running the Antlr generator).
If I make a change in one of the imported grammars and switch back to the main grammar to re-run my start rule there it doesn't always pick up the change from the imported grammar.
Hitting Ctrl+S after making the change in the imported grammar, before switching back to my main grammar, fixes the problem.
Having been struggling trying to bulkload data to the datastore, I have reached the point where expert help is needed.
I don't think what is am doing is tricky, I have the following configuration file:
and when I use the appcfg.py command, the error messages end with:
File "config.txt", line 1
python_preamble:
^
Syntax error: invalid syntax.
I have used a .txt file as it is faster to edit in notepad initially - I don't know if that is a problem and the remote_api for the appspot all seems to be okay.
I am thinking it is a fairly fundemental problem as it has stopped working at the top line. I removed the comment lines at the top of the original file - maybe that caused it.
I have tried to find working examples to set me right but they all seem to follow the syntax above, or where they are slightly different, I have tried both variants.
Help on bulkloading for my first cloud app would be much appreciated.
Thanks in advance for anyone taking time to read my post whether they solve it or not.
Be sure the configuration file extension is .yaml
Greetings
I'm working on a project that requires me to write queries in text form, then convert them to some easily processed nodes to be processed by some abiguous repository. Of everything there, the part I'm least interested is the part that converts the text to nodes. I'm hoping it's already done somewhere.
Because I'm making stuff up as I go, I chose to use a LINQish expression syntax.
from m in Movie select m.A, m.B
I started parsing it manually and got the basics, but it's pretty cheesy. I'm looking for the better solution. I made some progress using MGrammar, but it would be nice if such a thing already existed. Does anyone know of anything that already does this? I looked for existing ANTLR templates, but no luck.
Thanks for the help.
You could start with a full C# grammar and throw away everything but the LINQ syntax :-}
The DMS Software Reengineering Toolkit is a tool for building parsers/program analyzers/transformers that has a full C# 4.0 front end, including all the LINQ syntax.
Try this example from the Pyparsing wiki Examples page. It should give you a start.