piccolo 0.3.3

Stackless Lua VM implemented in pure Rust
Documentation 
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function is_err(f)
    return pcall(f) == false
end

do
    assert("a" .. "b" .. "c" == "abc")
    assert("a" .. 1 .. "c" == "a1c")
    assert(1 .. 2 .. 3 == "123")
end

do
    function test_coroutine_len()
        return nil
    end

    assert(is_err(function() return string.len(nil) end))
    assert(is_err(function() return string.len(true) end))
    assert(is_err(function() return string.len(false) end))
    assert(is_err(function() return string.len({}) end))
    assert(is_err(function() return string.len(is_err) end))
    assert(is_err(function() return string.len(coroutine.create(test_coroutine_len)) end))
    assert(string.len("") == 0)
    assert(string.len("x") == 1)
    assert(string.len("x\0") == 2)
    assert(string.len(1) == 1)
    assert(string.len(-1) == 2)
    assert(string.len(12) == 2)
    assert(string.len(123) == 3)
    assert(string.len(1.2) == 3)
    assert(string.len(-1.2) == 4)
    assert(string.len(1.23) == 4)
    assert(string.len(2147483647) == 10)
    assert(string.len(-2147483648) == 11)
end

do
    assert(is_err(function() return string.sub(nil) end))
    assert(is_err(function() return string.sub(true, 1) end))
    assert(is_err(function() return string.sub(false) end))
    assert(is_err(function() return string.sub({}) end))
    assert(is_err(function() return string.sub(is_err) end))
    assert(is_err(function() return string.sub(coroutine.create(test_coroutine_len)) end))
    assert(string.sub(48, 1) == "48")
    assert(string.sub(48, 2) == "8")
    assert(string.sub(48, -1) == "8")
    assert(string.sub("hilo", -1, -4) == "")
    assert(string.sub("hilo", -4, 4) == "hilo")
    assert(string.sub("hilo", -4, -3) == "hi")
    assert(string.sub("hilo", -4, -6) == "")
    assert(string.sub("hilo", 0, -4) == "h")
    assert(string.sub(3.4, 1, 2) == "3.")
end

do
    assert([[
foo
bar
baz]] == "foo\nbar\nbaz")
end

do
    assert(is_err(function() return string.lower(nil) end))
    assert(is_err(function() return string.lower(true) end))
    assert(is_err(function() return string.lower(false) end))
    assert(is_err(function() return string.lower({}) end))
    assert(is_err(function() return string.lower(is_err) end))
    assert(is_err(function() return string.lower(coroutine.create(test_coroutine_len)) end))
    assert(string.lower("HelLo") == "hello")
    assert(string.lower("ABCDEFGHIJKLMNOP123QRSTUVWXYZ") == "abcdefghijklmnop123qrstuvwxyz")
    assert(string.lower(80) == "80")
    assert(string.lower(3.14) == "3.14")
end

do
    assert(is_err(function() return string.reverse(nil) end))
    assert(is_err(function() return string.reverse(true) end))
    assert(is_err(function() return string.reverse(false) end))
    assert(is_err(function() return string.reverse({}) end))
    assert(is_err(function() return string.reverse(is_err) end))
    assert(is_err(function() return string.reverse(coroutine.create(test_coroutine_len)) end))
    assert(string.reverse("HelLo") == "oLleH")
    assert(string.reverse("raCecar") == "raceCar")
    assert(string.reverse(84) == "48")
    assert(string.reverse(3.14) == "41.3")
end

do
    assert(is_err(function() return string.upper(nil) end))
    assert(is_err(function() return string.upper(true) end))
    assert(is_err(function() return string.upper(false) end))
    assert(is_err(function() return string.upper({}) end))
    assert(is_err(function() return string.upper(is_err) end))
    assert(is_err(function() return string.upper(coroutine.create(test_coroutine_len)) end))
    assert(string.upper("HelLo") == "HELLO")
    assert(string.upper("abcdefghijklmnop123qrstuvwxyz") == "ABCDEFGHIJKLMNOP123QRSTUVWXYZ")
    assert(string.upper(80) == "80")
    assert(string.upper(3.14) == "3.14")
end