25d626ed50
This change more accurately implements ECMAScript prototype chains. This includes using the prototype chain to lookup properties when necessary, and copying them down upon writes. This still isn't 100% faithful -- for example, classes and constructor functions should be represented as real objects with the prototype link -- so that examples like those found here will work: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/constructor. I've updated marapongo/mu#70 with additional details about this. I'm sure we'll be forced to fix this as we encounter more "dynamic" JavaScript. (In fact, it would be interesting to start running the pre-ES6 output of TypeScript through the compiler as test cases.) See http://www.ecma-international.org/ecma-262/6.0/#sec-objects for additional details on the prototype chaining semantics. |
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cmd | ||
docs | ||
examples | ||
lib | ||
pkg | ||
sdk | ||
tools/mujs | ||
.gitignore | ||
.gitmodules | ||
glide.lock | ||
glide.yaml | ||
main.go | ||
Makefile | ||
README.md |
Mu
Mu is a framework and toolset for creating reusable stacks of services.
If you are learning about Mu for the first time, please see the overview document.
Architecture
Prerequisites
Mu is written in Go and uses Glide for dependency management. They must be installed:
If you wish to use the optional lint
make target, you'll also need to install Golint:
go get -u github.com/golang/lint/golint
Building and Testing
To build Mu, first clone it into a standard Go workspace:
$ mkdir -p $GOPATH/src/github.com/marapongo
$ git clone git@github.com:marapongo/mu $GOPATH/src/github.com/marapongo/mu
A good default value for GOPATH
is ~/go
.
Mu needs to know where to look for its runtime, library, etc. By default, it will look in /usr/local/mu
, however you
can override this with the MUPATH
variable. Normally it's easiest just to create a symlink:
$ ln -s $GOPATH/src/github.com/marapongo/mu /usr/local/mu
There is one additional build-time dependency, golint
, which can be installed using:
$ go get -u github.com/golang/lint/golint
And placed on your path by:
$ export PATH=$PATH:$GOPATH/bin
At this point you should be able to build and run tests from the root directory:
$ cd $GOPATH/src/github.com/marapongo/mu
$ glide update
$ make
This installs the mu
binary into $GOPATH/bin
, which may now be run provided make
exited successfully.
Compilers
The Mu compilers are built and tested independently from the Mu tool and runtime written in Go. Please see the respective pages for details on this process for each compiler:
Debugging
The Mu tools have extensive logging built in. In fact, we encourage liberal logging in new code, and addding new logging when debugging problems. This helps to ensure future debugging endeavors benefit from your sleuthing.
All logging is done using Google's Glog library. It is relatively barebones, and adds basic leveled logging, stack dumping, and other capabilities beyond what Go's built-in logging routines offer.
The Mu command line has two flags that control this logging and that can come in handy when debugging problems. The
--logtostderr
flag spews directly to stderr, rather than the default of logging to files in your temp directory. And
the --verbose=n
flag (-v=n
for short) sets the logging level to n
. Anything greater than 3 is reserved for
debug-level logging, greater than 5 is going to be quite verbose, and anything beyond 7 is extremely noisy.
For example, the command
$ mu compile blueprint.yaml --logtostderr -v=5
is a pretty standard starting point during debugging that will show a fairly comprehensive trace log of a compilation.