Add .bazelrc containing RBE config #8
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haikalpribadi
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Jun 25, 2022
## What is the goal of this PR?
Previously, if a TypeQL string contained a syntax error, and also had a trailing newline, an unhelpful error was thrown: `Index 1 out of bounds for length 1`. This was due to a bug in the error handler.
Now, a more helpful error is reported, for instance:
```
There is a syntax error at line 1:
match $x isa thing
^
no viable alternative at input 'match $x isa thing'
```
## What are the changes implemented in this PR?
Suppose we are parsing the following query:
```typeql
match $x isa thing
```
It includes a trailing newline.
Previously, we were attempting to parse the raw unmodified query string. The parser scans to the end of the query string and reports that there is a syntax error on line 2:
```
[TQL03] TypeQL Error: There is a syntax error at line 2:
^
no viable alternative at input 'match $x isa thing\n'
```
Firstly, this is still not a great error - it shows us that the "syntax error" is on a completely empty line.
Secondly, our error handler itself throws an error while trying to handle this error. In the error handler we convert the query string to a `List<String` using `String.split("\n")` with no `limit` parameter, which means that if the final character is a newline, we end up with less lines than we started with; in the example above, we have a 2-line query but only 1 entry in our String list.
We then print out a line from our string list that matches the line number where the error was reported, and boom, we get our `ArrayIndexOutOfBoundsException`.
We _could_ fix it by using `String.split("\n", -1)` which preserves all lines, even if they are blank; but, while that intuitively feels like the more "correct" fix, in practice, the resulting error is much nicer if we actually strip out the trailing newline. So we now use `trim` to strip out all leading and trailing whitespace, which should be intuitive enough for users.
(One thing to consider: should we strip only **trailing** whitespace?)
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What is the goal of this PR?
To enable RBE for faster tests. Closes #1.
What are the changes implemented in this PR?
.bazelrcfile. You can then invoke Bazel with RBE like so:bazel ... --config=rbe.BAZEL_RBE_CREDENTIAL. The environment variable is set not from the code but from the CircleCI setting for the Graql repository.