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  • simonw · 6 ✖

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  • allow leading comments in SQL input field · 6 ✖

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582211745 https://github.com/simonw/datasette/pull/653#issuecomment-582211745 https://api.github.com/repos/simonw/datasette/issues/653 MDEyOklzc3VlQ29tbWVudDU4MjIxMTc0NQ== simonw 9599 2020-02-05T02:28:05Z 2020-02-05T02:28:05Z OWNER 
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 allow leading comments in SQL input field 541331755  
582141626 https://github.com/simonw/datasette/pull/653#issuecomment-582141626 https://api.github.com/repos/simonw/datasette/issues/653 MDEyOklzc3VlQ29tbWVudDU4MjE0MTYyNg== simonw 9599 2020-02-04T22:13:31Z 2020-02-04T22:13:31Z OWNER

Looks like SQLite supports /* ... */ style comments as well. I don't think supporting those should be a requirement to land this though. https://www.sqlite.org/lang_comment.html

 
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 allow leading comments in SQL input field 541331755  
582141086 https://github.com/simonw/datasette/pull/653#issuecomment-582141086 https://api.github.com/repos/simonw/datasette/issues/653 MDEyOklzc3VlQ29tbWVudDU4MjE0MTA4Ng== simonw 9599 2020-02-04T22:12:00Z 2020-02-04T22:12:00Z OWNER

You may well be right there! Let's add a test that demonstrates it.

 
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 allow leading comments in SQL input field 541331755  
582103856 https://github.com/simonw/datasette/pull/653#issuecomment-582103856 https://api.github.com/repos/simonw/datasette/issues/653 MDEyOklzc3VlQ29tbWVudDU4MjEwMzg1Ng== simonw 9599 2020-02-04T20:38:18Z 2020-02-04T20:38:18Z OWNER

We can probably solve this without a SQL parser though. Really all we care about here is that if the FIRST lines of the statement begin with -- we ignore them and only validate the statement starting from the first non-commented line. I think we can do that without single quoted strings causing us confusion.

 
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 allow leading comments in SQL input field 541331755  
582101530 https://github.com/simonw/datasette/pull/653#issuecomment-582101530 https://api.github.com/repos/simonw/datasette/issues/653 MDEyOklzc3VlQ29tbWVudDU4MjEwMTUzMA== simonw 9599 2020-02-04T20:32:11Z 2020-02-04T20:32:11Z OWNER

This is the kind of problem that has made me think that Datasette would really benefit from including a smart SQLite-syntax SQL parser.

Writing one is a bit of a challenge though! There's an example (derived from SQLite SELECT statements) included in pyparsing here but I've not spent much time evaluating it: https://github.com/pyparsing/pyparsing/blob/master/examples/select_parser.py

 
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 allow leading comments in SQL input field 541331755  
582100643 https://github.com/simonw/datasette/pull/653#issuecomment-582100643 https://api.github.com/repos/simonw/datasette/issues/653 MDEyOklzc3VlQ29tbWVudDU4MjEwMDY0Mw== simonw 9599 2020-02-04T20:29:56Z 2020-02-04T20:29:56Z OWNER

I think there's one nasty edge-case here that we need to worry about: SQLite allows newlines inside of single quoted strings and I've actually started using that in quite a few places - it's great for embedding markdown in a string for example.

The way you're stripping comments right now splits on newlines and removes any lines that start with --. I believe that will mangle the following example:

```sql select '# Hello there

  • This is a list

  • of items

    And a link.' as demo_markdown ```
 
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 allow leading comments in SQL input field 541331755  

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