Bob Nystrom
23b6980dfd
Add three new public C API functions to the Wren embedding API that enable foreign methods to create and populate lists. wrenEnsureSlots grows the foreign slot stack to guarantee space for temporary work, wrenSetSlotNewList stores a new empty list in a slot, and wrenInsertInList inserts a value from one slot into a list at another slot at a given index (supporting negative indices for relative positioning). The implementation includes a new internal ensureStack helper that reallocates the fiber's stack and updates all pointers (stack top, call frame starts, open upvalues, and foreign stack start) when the reallocation moves the stack. New test files (lists.c, lists.h, lists.wren) exercise creation, appending, insertion, and negative index insertion, and the existing slots test is extended with an ensure test that verifies slot count growth and slot usability.
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!
