I've tried RTM, but: given an ICU UErrorCode, how can I obtain the corresponding error message string? I.e., ICU's equivalent of strerror(3).
const char *u_errorName(UErrorCode code) is the C version of ErrorCode::errorName - but there isn't an "error message" that is anything more than the enum name. That's a great idea, though- I'd recommend to file a bug. Or, consider contributing the code and data? Ideally it would be a localized message…
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I am currently playing with the happy parser generator.
Other parser generators can give nice messages like "unexpected endline, expected 'then'".
With happy I just get the current Tokens and the position of the error.
Can you give me an example of how to get error messages like above?
There is a Happy feature that I have authored for this purpose.
See my blog post: Toward better GHC syntax errors
It was merged in this pull request RFC: On parse error - show the next possible tokens.
Generally, from what I've heard, if you want nice parser errors, use Parsec instead of Happy.
I'm currently trying to learn Nim (it's going slowly - can't devote much time to it). On the other hand, in the interests of getting some working code, I'd like to prototype out sections of a Nim app I'm working on in ruby.
Since mruby allows embedding a ruby subset in a C app, and since nim allows compiling arbitrary C code into functions, it feels like this should be relatively straightforward. Has anybody done this?
I'm particularly looking for ways of using Nim's funky macro features to break out into inline ruby code. I'm going to try myself, but I figure someone is bound to have tried it and /or come up with more elegant solutions than I can in my current state of learning :)
https://github.com/micklat/NimBorg
This is a project with a somewhat similar goal. It targets python and lua at the moment, but using the same techniques to interface with Ruby shouldn't be too hard.
There are several features in Nim that help in interfacing with a foreign language in a fluent way:
1) Calling Ruby from Nim using Nim's dot operators
These are a bit like method_missing in Ruby.
You can define a type like RubyValue in Nim, which will have dot operators that will translate any expression like foo.bar or foo.bar(baz) to the appropriate Ruby method call. The arguments can be passed to a generic function like toRubyValue that can be overloaded for various Nim and C types to automatically convert them to the right Ruby type.
2) Calling Nim from Ruby
In most scripting languages, there is a way to register a foreign type, often described in a particular data structure that has to be populated once per exported type. You can use a bit of generic programming and Nim's .global. vars to automatically create and cache the required data structure for each type that was passed to Ruby through the dot operators. There will be a generic proc like getRubyTypeDesc(T: typedesc) that may rely on typeinfo, typetraits or some overloaded procs supplied by user, defining what has to be exported for the type.
Now, if you really want to rely on mruby (because you have experience with it for example), you can look into using the .emit. pragma to directly output pieces of mruby code. You can then ask the Nim compiler to generate only source code, which you will compile in a second step or you can just change the compiler executable, which Nim will call when compiling the project (this is explained in the same section linked above).
Here's what I've discovered so far.
Fetching the return value from an mruby execution is not as easy as I thought. That said, after much trial and error, this is the simplest way I've found to get some mruby code to execute:
const mrb_cc_flags = "-v -I/mruby_1.2.0_path/include/ -L/mruby_1.2.0_path/build/host/lib/"
const mrb_linker_flags = "-v"
const mrb_obj = "/mruby_1.2.0_path/build/host/lib/libmruby.a"
{. passC: mrb_cc_flags, passL: mrb_linker_flags, link: mrb_obj .}
{.emit: """
#include <mruby.h>
#include <mruby/string.h>
""".}
proc ruby_raw(str:cstring):cstring =
{.emit: """
mrb_state *mrb = mrb_open();
if (!mrb) { printf("ERROR: couldn't init mruby\n"); exit(0); }
mrb_load_string(mrb, `str`);
`result` = mrb_str_to_cstr(mrb, mrb_funcall(mrb, mrb_top_self(mrb), "test_func", 0));
mrb_close(mrb);
""".}
proc ruby*(str:string):string =
echo ruby_raw("def test_func\n" & str & "\nend")
"done"
let resp = ruby """
puts 'this was a puts from within ruby'
"this is the response"
"""
echo(resp)
I'm pretty sure that you should be able to omit some of the compiler flags at the start of the file in a well configured environment, e.g. by setting LD_LIBRARY_PATH correctly (not least because that would make the code more portable)
Some of the issues I've encountered so far:
I'm forced to use mrb_funcall because, for some reason, clang seems to think that the mrb_load_string function returns an int, despite all the c code I can find and the documentation and several people online saying otherwise:
error: initializing 'mrb_value' (aka 'struct mrb_value') with an expression of incompatible type 'int'
mrb_value mrb_out = mrb_load_string(mrb, str);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~
The mruby/string.h header is needed for mrb_str_to_cstr, otherwise you get a segfault. RSTRING_PTR seems to work fine also (which at least gives a sensible error without string.h), but if you write it as a one-liner as above, it will execute the function twice.
I'm going to keep going, write some slightly more idiomatic nim, but this has done what I needed for now.
I am checking if a web exception message contains a string I have.
My string is: "The remote name could not be resolved"
The web exception message is:"The remote name could not be resolved:"
You would expect it to work, but if you copy-paste and enlarge the web exception here you will notice tiny dots between every word.
Those dots apparently ruins the contains function I use.
If exWeb.Message.Contains("The remote name could not be resolved") Then
'Do something...
End If
How can I compare those strings without the dots or ignore the dots or any other solution?
Relying on the message string isn't very future proof, as the framework developers may decide to change the message in the future for various reasons (to make it more explanatory, change grammar .etc.) or your code could be running in a different locale with a different language causing the error message to be different.
I suggest you check the Status property instead.
See the documentation of the Enum. I think you're looking for a WebException with a Status of NameResolutionFailure
https://msdn.microsoft.com/en-us/library/system.net.webexceptionstatus(v=vs.110).aspx
I am a bit confused by what I see and hence headed over to SO.
I am developing a BizTalk (2010) Orchestration and I am wanting to parse an incoming XML message. I just need to retrieve then number of times a particular node is repeating. I could have used XPath. But, I chose to use LinqToXml.
I have created a variable of type System.Xml.Linq.XNamespace and inside an expression shape, I am assignning it a string value.. say http://mycompany/v1.0. This is a perfectly valid C# statment, as there is an implicit conversion from String to XNamespace (MSDN link).
But the Orchestration will not compile at all. I get this error cannot implicitly convert type System.String to System.Xml.Linq.XNamespace.
And if I dont use the XNamespace variable and directly run LinqToXml on the incoming message like this
MessageCount = MyXElement.Elements("{http://mycompany/v1.0}ListOfNotifications").Elements("{http://mycompany/v1.0}Notification").Count();
I get a cannot convert from String to XName error. Even this is confusing.
I am using BizTalk 2010 and C# 4.0. Can someone explain if I am missing something? I have tried all these code snippets using LinqPad and I get the expected response. So, there are no typos or missing references.
I opted to use the XPath option to retrieve the values that I needed, instead of using LinqToXml. The code that I ended up writing looks like below:
xpath(myOrchVariable, "string(/*[local-name()='InputRootNode' and namespace-uri()='http://my/name/space'])")
I have an Installshield2010 project that has had this warning since before my employment
ISDEV : warning -3028: The string ID "IDS_ERROR_27555" was not found in the string table. It is referenced in the table:"Error" in column:"Message".
Looking in the svn history, this row was added to Error table a few years ago - alongside a seemingly unrelated change
<row><td>27555</td><td>##IDS_ERROR_27555##</td></row>
However as the error indicates, there is no corresponding entry in the ISString table.
I'm curious how it got added. The IDS_ERROR strings look like canned strings, it seems really unlikely the person who added this to my ism did so manually.
Of course Flexera's forums are a ghost town. I did find an ism that has that string defined as
<row><td>IDS_ERROR_27555</td><td>1033</td><td>Error attempting to apply permissions to object '[2]'. System error: [3] ([4])</td><td>0</td><td/><td>1394414478</td></row>
Do any of your ism's have IDS_ERROR_27555 defined or referenced? Am very sure I can delete the string and be no worse for wear... but it bugs me to not know what happened.
I don't remember in which version we added these strings, but you can get them by importing the strings file for your language (1033.txt for English) under the Languages folder. Upgrading across versions of InstallShield should have added this string. You can add them yourself by importing the strings file in the String Editor view. Of course if you've modified other strings, you'll want to ensure that you keep your preferred version.