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recbird - An Erlang Dynamic Record Inferring Parse Transform
You should have read Yariv's recless blog, a nice blog talking about how to make record accessing simple.
Recless is a static type inferring record parse transform, that means, as described in Yariv's blog:
one main restriction in Recless’s type inference algorithm: function parameters must indicate their record types for type inference to work on them. For instance, this won’t work:get_name(Person) -> Person.name.Instead, you must write this:get_name(Person = #person{}) -> Person.name.
How about a dynamic record inferring solution? I got some idea that was also inspired from my friend Haobo. As I'm familiar with Erlang AST tree when developing ErlyBird, I took a try and got some good result. I named it recbird.
The magic behind recbird is, it parses the Erlang AST tree, and adds some setter/getter functions for each record's field. Then, at runtime, it will detect the first element of record var, and thus knows which setter/getter function should be redirected, and call it.
It just works now, with none limits, you can write R.a.b.c and R.a.b.c = Sth almost every where.
Notice: There may be some bugs.
The perfomance is also reasonable, for example, when you do R.a.b = 'yes' 1,000,000 times, the original Erlang record syntax takes about 300ms in my machine, the recbird is about 310ms. When you run it 10,000,000 times, the recbird is about 150% more time costed than original Erlang record accessing.
The recbird's source code can be got at: recbird.erl
To use it, compile it, include compiled recbird.beam under your code path, add
-compile({parse_transform, recbird}).
in your source file.
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