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First implementation for 'const' variables

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A variable can be declared const, which means it cannot be assigned to,
with the syntax 'local <const> name = exp'.
This commit is contained in:
Roberto Ierusalimschy
2019-05-17 11:11:44 -03:00
parent 347d6961ac
commit d9f40e3f6f
7 changed files with 207 additions and 58 deletions
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8
testes/files.lua
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@@ -144,7 +144,7 @@ do
f:write(string.format("0x%X\n", -maxint))
f:write("-0xABCp-3", '\n')
assert(f:close())
f = assert(io.open(file, "r"))
local <toclose> f = assert(io.open(file, "r"))
assert(f:read("n") == maxint)
assert(f:read("n") == maxint)
assert(f:read("n") == 0xABCp-3)
@@ -170,18 +170,18 @@ three
]]
local l1, l2, l3, l4, n1, n2, c, dummy
assert(f:close())
f = assert(io.open(file, "r"))
local <toclose> f = assert(io.open(file, "r"))
l1, l2, n1, n2, dummy = f:read("l", "L", "n", "n")
assert(l1 == "a line" and l2 == "another line\n" and
n1 == 1234 and n2 == 3.45 and dummy == nil)
assert(f:close())
f = assert(io.open(file, "r"))
local <toclose> f = assert(io.open(file, "r"))
l1, l2, n1, n2, c, l3, l4, dummy = f:read(7, "l", "n", "n", 1, "l", "l")
assert(l1 == "a line\n" and l2 == "another line" and c == '\n' and
n1 == 1234 and n2 == 3.45 and l3 == "one" and l4 == "two"
and dummy == nil)
assert(f:close())
f = assert(io.open(file, "r"))
local <toclose> f = assert(io.open(file, "r"))
-- second item failing
l1, n1, n2, dummy = f:read("l", "n", "n", "l")
assert(l1 == "a line" and n1 == nil)