Re: [gentoo-portage-dev] Google Summer of Code: Bash AST and grammar
On 07/21/10 15:49, Nathan Eloe wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hello portage developers My name is Nathan Eloe, and I'm working on a Google Summer of Code project in which I'm writing a library that will create an Abstract Syntax Tree of the bash grammar. In essence I am recreating the bash grammar and structuring it as an AST. I am writing to you because you have shown interest in this project. I have attached a bash script which demonstrates the supported functionality of the grammar thus far and the resulting AST. Nice, you have covered quite a few constructs alraedy. I would greatly appreciate input on the tree I'm unsure if such a big file and tree is good to handle. I propose to split this test suite to many small cases. as well as insight into missing functionality you might see. A few things I haven't seen, yet: # Adjacent changes in quotation echo abc''def # Makes abcdef # Escape sequences like .. echo abc\def # Invocation from ibnside strings echo foo $(echo foo), bar `echo bar` # Heredocs (and their variations ..) cat EOF /dev/stdout 1 2 EOF # Construct of $((..)) # Refs to variable withzout $ upfront z=3; echo $((z+3)) Best, Sebastian
Re: [gentoo-portage-dev] Google Summer of Code: Bash AST and grammar
On 07/21/10 16:56, Sebastian Pipping wrote: A few things I haven't seen, yet: # Adjacent changes in quotation echo abc''def # Makes abcdef # Escape sequences like .. echo abc\def # Invocation from ibnside strings echo foo $(echo foo), bar `echo bar` # Heredocs (and their variations ..) cat EOF /dev/stdout 1 2 EOF # Construct of $((..)) # Refs to variable withzout $ upfront z=3; echo $((z+3)) An important one I forgot: # Line continuation echo one \ two Potentially hase quite a few sub cases .. Best, Sebastian
Re: [gentoo-portage-dev] Google Summer of Code: Bash AST and grammar
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On 7/21/10 10:25 AM, Sebastian Pipping wrote: On 07/21/10 16:56, Sebastian Pipping wrote: A few things I haven't seen, yet: # Adjacent changes in quotation echo abc''def # Makes abcdef # Escape sequences like .. echo abc\def # Invocation from ibnside strings echo foo $(echo foo), bar `echo bar` I'll test those, though I think the only one that I haven't even thought about was the escape sequences # Heredocs (and their variations ..) cat EOF /dev/stdout 1 2 EOF Heredocs/strings are... present but broken. The problem is they just consume strings like crazy. Perhaps with some semantic predicates I can get it to stop at the end. For now though it would just keep consuming till the end of the file # Construct of $((..)) # Refs to variable withzout $ upfront z=3; echo $((z+3)) An important one I forgot: # Line continuation echo one \ two Both of these have yet to be implemented, though doing so should be trivial. Thanks for the input! Any and all input I can get is helpful. Nathan -BEGIN PGP SIGNATURE- Version: GnuPG/MacGPG2 v2.0.14 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkxHH5MACgkQFpoRlVgtqKbnfwCbBdgYaqZfSLxa7GTgrtV1wZfg e94An3HkOPUE6BVQ1YsyeogJ92ZsRK6z =5ezP -END PGP SIGNATURE-
