Hi everyone,
I am happy to announce gomacro, yet another Go interpreter:
https://github.com/cosmos72/gomacro
I started it as an experiment to play with Go, and to try adding Lisp-like
macros,
i.e. compile-time execution of arbitrary user code (extremely handy for
code generation).
It turned into a fairly complete Go interpreter, implemented in pure Go,
built on top of the go/ast and reflect packages.
Basic features:
* REPL with multiline input (no history/readline yet)
* all primitive types, including interface{}
* expressions and statements
* declaring functions, variables and constants
* declaring, creating and accessing pointers, slices, arrays, maps, channels
* all Go builtins - see https://golang.org/pkg/builtin/
Some more advanced features:
* imports - Go standard packages "just work". For the others, gomacro
compiles and loads a plugin - Go 1.8 currently supports them only on Linux
* defer, panic and recover (implementing recover was definitely non-trivial)
* composite literals
* function literals (i.e. closures)
* declaring new struct types (currently only public fields, and no methods
yet)
* REPL command :env <package> to show the functions, variables, constants
and types exported by a package (you need to import it first)
* REPL command :inspect <expression> to interactively drill down structs
and slices
* builtin functions Parse and Eval: Parse converts a string into an
ast.Node, Eval evaluates it.
* macro and related facilities: quote, quasiquote, unquote, unquote_splice,
MacroExpand, MacroExpand1, macroexpansion code-walker
As stated on the github project, some things are still missing:
* REPL history/readline
* declaring variadic functions
* for-range on channels
* switch, fallthrough, type switch, select, labeled statements
* goto (difficult)
* the keyword "go" (introduces tons of races... requires switching the
interpreter to thread-safe maps)
* declaring interfaces (difficult)
* declaring methods (difficult)
* REPL command to switch to a different package
volunteers are welcome :)
--
Max
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