This restructures the examples directory a bit, into three buckets:
* basic/: simplistic examples, like hello world and whatnot.
* conversions/: actual conversions from existing samples (with the source cited).
* scenarios/: more complex examples that demonstrate various features of the system.
This change adds a --dot option to the eval command, which will simply
output the MuGL graph using the DOT language. This allows you to use
tools like Graphviz to inspect the resulting graph, including using the
`dot` command to generate images (like PNGs and whatnot).
For example, the simple MuGL program:
class C extends mu.Resource {...}
class B extends mu.Resource {...}
class A extends mu.Resource {
private b: B;
private c: C;
constructor() {
this.b = new B();
this.c = new C();
}
}
let a = new A();
Results in the following DOT file, from `mu eval --dot`:
strict digraph {
Resource0 [label="A"];
Resource0 -> {Resource1 Resource2}
Resource1 [label="B"];
Resource2 [label="C"];
}
Eventually the auto-generated ResourceN identifiers will go away in
favor of using true object monikers (marapongo/mu#76).
Glog doesn't actually print out the stack traces for all goroutines,
when --logtostderr is enabled, the same way it normally does. This
makes debugging more complex in some cases. So, we'll manually do it.
Turns out we hadn't been transforming interface heritage clauses --
extends and implements -- like we were classes. This change fixes
that. As a result, we're down to 14 verification errors for AWS.
This change renames the old Error type to Exception -- more consistent
with our AST, etc. nodes anyway -- and introduces a new Error type ("<error>")
to use when something during typechecking or binding fails.
The old way led to errors like:
error: MU504: tags.ts:32:18: Symbol 'Tag:push' not found
error: MU522: tags.ts:32:8: Cannot invoke a non-function; 'any' is not a function
This is because of cascading errors during type-checking; the symbol not found
error means we cannot produce the right type for the function invoke that
consumes it. But the 'any' part is weird. Instead, this new change produces:
error: MU504: tags.ts:32:18: Symbol 'Tag:push' not found
error: MU522: tags.ts:32:8: Cannot invoke a non-function; '<error>' is not a function
It's slightly better. And furthermore, it gives us a leg to stand on someday
should we decide to get smarter about detecting cascades and avoiding issuing
the secondary error messages (we can just check for the Error type).
This change also accepts MuPackages during MuJS dependency resolution.
The old logic wasn't quite right, because it would skip over MuPackage
files, and keep probing upwards, possibly binding to the wrong, pre-
compilation, Mufile. Note that we must still probe for both Mupackages
and Mufiles, because of intra-package dependencies.
After this change, the AWS MuPackage is down to 28 verification errors.
This change fixes a few more phasing issues in the compiler. Namely,
it now splits all passes into three distinct phases:
1. Declarations: simply populating names.
2. Definitions: chasing down any references to other names from those
declared entities. For instance, base classes, other modules, etc.
3. Bodies: fully type-checking everything else, which will depend
upon both declarations and definitions being fully present.
This changes a few things with dependency probing:
1) Probe for Mupack files, not Mufiles.
2) Substitute defaults in the PackageURL before probing.
3) Trace the full search paths when an import fails to resolve.
This will help diagnose dependency resolution issues.
This adds support for sugared "*" semvers, which is a shortcut for
">=0.0.0" (in other words, any version matches). This is a minor part
of marapongo/mu#18. I'm just doing it now as a convenience for dev
scenarios, as we start to do real packages and dependencies between them.
This change:
* Renames the Mu standard library NPM package from "mu" to "@mu/mu".
This reflects the convention that MuPackages published on NPM will,
at least initially, be published under the "@mu" scope. This
indicates that a package is intended to be consumed by Mu programs.
* Adds an NPM peerDependency on the Mu package from the AWS package.
* Adds a Mu dependency on the Mu package from the AWS MuPackage.
To prepare a MuPackage for consumption by another MuPackage, we need
to save the definition files output by the TypeScript compiler. In
theory, we could regenerate these definitions from the MuPackage itself;
in fact, when we tackle cross-language, this will be necessary. For
now, however, it's much simpler to simply save the definition outputs
alongside the Mupack.json package metadata.
Note that we do not save "code" outputs. The MuIL format encodes all
computations and so the only thing we need for dependent packages is
the header files to compile against; all "link" and runtime dependencies
are satisfied by the MuIL format and Mu toolchain.
There are a variety of ways to specify a MuJS output location, including
the command line --out (-o for short) flag. If that isn't present, we simply
dump the Mupack.json file in the current working directory. However, in order
to prepare Mupackage files for packaging, distribution, and reuse, we actually
want to store the Mupack.json file alongside all the other package assets (like
TypeScript header files). So it makes sense to recognize the outDir, if present,
in the tsconfig.json file, and use it as the default if not otherwise specified.
This change permits object literals with the type of `any`; although
they will typically get coerced to record/interface types prior to use,
there is no reason to ban `any`. In fact, it is the idiomatic way of
encoding "objects as bags of properties" that is common to dynamic
languages like JavaScript, Python, etc.
This changes transformIdentifierExpression to call through to the
general purpose function that understands how to transform any Symbol
reference into a fully qualified token suitable for serialization.
This change recognizes identifier expressions that mention the null and
undefined constants, transforming them into null literals. Note that
marapongo/mu#70 tracks mimicking the subtle differences between
undefined and null in ECMAScript.
This change adds support for loading from export locations. All we
need to do is keep chasing the referent pointer until we bottom out
on an actual method, property, etc.
In the event that we're loading a property straight from a module,
we needn't actually load the module at all; instead, we refer to it
using a fully qualified token.
In many cases, property access expressions interact with types. For
example, the expression `o.j.bar()` likely accesses variable `o`, then
its property `j`, then `j`'s method `bar`. In other cases, however,
property access elements are actually modules. For example, in:
import * as o from "o";
o.j.bar();
This change recognizes this situation and emits code correctly.
This change fixes a whole host of issues with our current token binding
logic. There are two primary aspects of this change:
First, the prior token syntax was ambiguous, due to our choice of
delimiter characters. For instance, "/" could be used both as a module
member delimiter, in addition to being a valid character for sub-modules.
The result is that we could not look at a token and know for certain
which kind it is. There was also some annoyance with "." being the
delimiter for class members in addition to being the leading character
for special names like ".this", ".super", and ".ctor". Now, we just use
":" as the delimiter character for everything. The result is unambiguous.
Second, the simplistic token table lookup really doesn't work. This is
for three reasons: 1) decorated types like arrays, maps, pointers, and
functions shouldn't need token lookup in the classical sense; 2) largely
because of decorated naming, the mapping of token pieces to symbolic
information isn't straightforward and requires parsing; 3) default modules
need to be expanded and the old method only worked for simple cases and,
in particular, would not work when combined with decorated names.
Previously we asserted that typemap entries are never nil. It turns
out we represent "void" as the absence of a type in MuIL, and so we need
to permit these for constructors, etc.
This change recognizes the special case of a `super` variable load
in the position of a function call. Left on its own, this yields
unverifiable MuIL, because we attempt to invoke a non-function.
This change fixes the type token emission logic in MuJS to emit fully
resolved tokens for intra-module type references. The prior logic emitted
simple identifiers when type references were contained within a single file.
This hearkens back to the days where we used simple names, coupled with a
lexical symbol table, to resolve such things.
This brings the AWS MuPack verification error count to 57 from 84.
This change further rearranges the phasing of binding to account for
the fact that class definitions may freely reference exports, which won't
be known until after binding class names. Therefore, we bind class names
first and then the definitions (function signatures and variables).
This brings the AWS MuPackage's number of verification errors down to 84
from 136.
The old method of specifying a default module for a package was using
a bit on the module definition itself. The new method is to specify the
module name as part of the package definition itself.
The new approach makes more sense for a couple reasons. 1) it doesn't
make sense to have more than one "default" for a given package, and yet
the old model didn't prevent this; the new one prevents it by construction.
2) The defaultness of a module is really an aspect of the package, not the
module, who is generally unaware of the package containing it.
The other reason is that I'm auditing the code for nondeterministic map
enumerations, and this came up, which simply pushed me over the edge.
