Add support for parsing import statement start & end

[FredKSchott]

Resolves one half of #36

• Adds statement_start (ss) and statement_end (se) to the data object for standard imports.
• For dynamic imports & import.meta, both values return -1.

[FredKSchott]

I was able to see and fix all compilation errors, but clang was having trouble actually building the thing. I think the make file is using flags that my version of clang doesn't support.

If you can check this out locally and compile + confirm that tests are passing, that would be great. Otherwise, when I next have time I can try to fiddle with updating clang (can you let me know what version you use / is needed?).

[guybedford]

Great to see this, thanks.

@FredKSchott yes getting the build setup is the hard part as mentioned here. I'm just off on a holiday right now, so won't be able to look at this for the next week or so unfortunately. It would help a lot for review if you can try confirm the build and tests are passing here.

The WASI SDK from https://github.com/CraneStation/wasi-sdk/releases needs to be downloaded to be referenced from https://github.com/guybedford/es-module-lexer/blob/master/Makefile#L6. Getting the exact path level there is a gotcha - one nested folder too deep and it blows up, until it works. Any Clang 8 version should work, or you can use the WASI SDK Clang build which includes everything needed. See https://github.com/guybedford/es-module-lexer#building for more info too.

[FredKSchott]

@guybedford Okay, comments responded to, it's passing compilation but I cannot for the life of me get it building/linking successfully. I've tried on both my local mac (ld: unknown option: -z) and a clean Ubuntu machine on AWS (../wasi-sdk-6/opt/wasi-sdk/share/wasi-sysroot/include/wasi/core.h:15:2: error: <wasi/core.h> is only supported on WASI platforms.). I'm sure that I did something stupid installing the right version of clang/etc., but unfortunately I don't have any more time available to spend on this for the moment.

[guybedford]

@FredKSchott thanks for trying, yes I know it's a pain! All the more reason to migrate this project to Ziglang as I say, in due course :)

The build ran smoothly with just one or two bugs that needed correcting. I've gone ahead and landed on master, will push out a release shortly. Hope it helps you there! I'm sure there will be more bugs in this project, so further contributions back in future would be appreciated - this isn't a huge priority for me so can't guarantee ongoing support, but will do all I can to facilitate any PRs or interested maintainers.

[guybedford]

Released in 0.3.14.

[FredKSchott]

Ah thanks for getting this over the line @guybedford. I'll start to integrate it into my project and let you know if anything comes up in the future. Happy to contribute some PRs for anything that I find if time allows.

Thanks for the great project/package!