<div dir="ltr">What if the lexer was an overly large, non-abstract base class? Then, the derived classes can just override the tokens as needed.</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Nov 1, 2013 at 1:37 PM, Edwin Vane <span dir="ltr"><<a href="mailto:revane@gmail.com" target="_blank">revane@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">I think this is a great idea. clang-format is so useful and I'd love to be able to use it with other languges I use. I agree with Chris that lexing support for all these languages should be somehow separate from clang to prevent clang from becoming unmaintainably complex.</div>
<div class="gmail_extra"><br><br><div class="gmail_quote"><div><div class="h5">On Fri, Nov 1, 2013 at 1:15 PM, Daniel Jasper <span dir="ltr"><<a href="mailto:djasper@google.com" target="_blank">djasper@google.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5">
<div dir="ltr"><div style="font-family:arial,sans-serif;font-size:13px">The context-free parser implemented in clang-format is capable of (or can easily be extended to) understand the structure of basically all C-like languages. A basic definition of C-like languages is the “Influenced” section of C’s Wikipedia page [1].</div>
<div style="font-family:arial,sans-serif;font-size:13px"><br></div><div style="font-family:arial,sans-serif;font-size:13px">At most, this includes: AMPL, AWK, csh, C++, C--, C#, Objective-C, BitC, D, Go, Rust, Java, JavaScript, Limbo, LPC, Perl, PHP, Pike, Processing, Seed7, Verilog. Today, clang-format already supports C, C++, Objective-C and Objective-C++. Starting from there, it seems almost trivial to extend support to JavaScript and Java which only contain a small number of additional syntactical constructs and can be tokenized with Clang’s lexer. Eventually, we also imagine (and would love to see patches for) formatting C#, D, Go, Rust, and PHP based on their similar syntax and active usage. Maybe there are others the community would be interested in seeing?</div>
<div style="font-family:arial,sans-serif;font-size:13px"><br></div><div style="font-family:arial,sans-serif;font-size:13px">The benefit of using the same format tool for all these jobs is that many of clang-format’s advanced formatting algorithms (e.g. Tex-like analysis of the entire solution space) are immediately available to the other languages.</div>
<div style="font-family:arial,sans-serif;font-size:13px"><br></div><div style="font-family:arial,sans-serif;font-size:13px">Concrete proposal:</div><div style="font-family:arial,sans-serif;font-size:13px"><br></div><div style="font-family:arial,sans-serif;font-size:13px">
Start with JavaScript. Syntactically, it is very close to C++ and there are already different efforts going on to combine JavaScript and LLVM. Add an additional LanguageStandard (this flag already supports C++03 and C++11) in clang-format’s configuration and gate JavaScript specific formatting decisions (e.g. indentation of JavaScript’s namespace-equivalent on it).</div>
<div style="font-family:arial,sans-serif;font-size:13px"><br></div><div style="font-family:arial,sans-serif;font-size:13px">To make clang-format more useful to the LLVM project itself, support for the tblgen language seems another worthy goal that can be achieved in the same way as JavaScript.</div>
<div style="font-family:arial,sans-serif;font-size:13px"><br></div><div style="font-family:arial,sans-serif;font-size:13px">Thoughts? Comments? Concerns with this direction?</div><div style="font-family:arial,sans-serif;font-size:13px">
<br></div><div style="font-family:arial,sans-serif;font-size:13px">If this is in line with LLVM’s/Clangs’s roadmap, we'll start working on the few features missing for formatting JavaScript and we should have rudimentary support towards the end of the year.</div>
<div style="font-family:arial,sans-serif;font-size:13px"><br></div><div style="font-family:arial,sans-serif;font-size:13px">[1] <a href="http://en.wikipedia.org/wiki/C_(programming_language)" target="_blank">http://en.wikipedia.org/wiki/C_(programming_language)</a></div>
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