Bob Nystrom
1de17224e8
Add a new public API function `wrenAbortFiber()` that allows foreign methods to abort the currently executing fiber with a custom runtime error object. The function validates the API slot, then sets the fiber's error field to the value in the specified slot. The interpreter loop is updated to check for a non-null fiber error after calling a foreign method, triggering a runtime error if set. New test files (error.c, error.h, error.wren) demonstrate usage via a static Error.runtimeError foreign method, verifying that the error is propagated through Fiber.try() and that the fiber's isDone and error properties are correctly set. Xcode project updated to include the new error.c source file.
Wren is a small, fast, class-based concurrent scripting language
Think Smalltalk in a Lua-sized package with a dash of Erlang and wrapped up in a familiar, modern syntax.
System.print("Hello, world!")
class Wren {
flyTo(city) {
System.print("Flying to %(city)")
}
}
var adjectives = Fiber.new {
["small", "clean", "fast"].each {|word| Fiber.yield(word) }
}
while (!adjectives.isDone) System.print(adjectives.call())
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Wren is small. The VM implementation is under 4,000 semicolons. You can skim the whole thing in an afternoon. It's small, but not dense. It is readable and lovingly-commented.
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Wren is fast. A fast single-pass compiler to tight bytecode, and a compact object representation help Wren compete with other dynamic languages.
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Wren is class-based. There are lots of scripting languages out there, but many have unusual or non-existent object models. Wren places classes front and center.
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Wren is concurrent. Lightweight fibers are core to the execution model and let you organize your program into an army of communicating coroutines.
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Wren is a scripting language. Wren is intended for embedding in applications. It has no dependencies, a small standard library, and an easy-to-use C API. It compiles cleanly as C99, C++98 or anything later.
If you like the sound of this, let's get started. You can even try it in your browser! Excited? Well, come on and get involved!
