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Introduce special treatment for the blank identifier _

Browse source 
Mostly: Do not instantiate variables within for loops and allow
reusing differently typed blanks which previously wasn't possible.

This may be missing some corner-cases, but the added tests seem
to work as expected and nothing else fell apart it seems.
This commit is contained in:
Arne Welzel 2022-09-30 17:38:00 +02:00
parent 7f7c77ab07
commit 46334f8b59
21 changed files with 318 additions and 20 deletions
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54
testing/btest/language/blank-expr-errors.zeek Normal file
View file

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# @TEST-DOC: Do not allow to reference the blank identifier.
# @TEST-EXEC-FAIL: zeek -b %INPUT
# @TEST-EXEC: TEST_DIFF_CANONIFIER=$SCRIPTS/diff-remove-abspath btest-diff .stderr
event zeek_init()
{
local vec = vector( "1", "2", "3" );
for ( _, v in vec )
print _;
}
@TEST-START-NEXT
event zeek_init()
{
local _ = vector( "1", "2", "3" );
print _;
}
@TEST-START-NEXT
# Ensure it does not work in a module, either.
module MyModule;
event zeek_init()
{
local _ = vector( "1", "2", "3" );
print _;
}
@TEST-START-NEXT
# Ensure _ can not referenced when it's a const in an export section.
# Adding the const _ isn't an error though.
module MyModule;
export {
const _: count = 1;
}
event zeek_init()
{
print MyModule::_;
}
@TEST-START-NEXT
# Ensure it does not work in a function.
module MyModule;
function helper()
{
local _ = vector( "1", "2", "3" );
print _;
}
event zeek_init()
{
helper();
}