Improve some things around how errors are reported when parsing a file

[Tatskaari]

Given the malformed input "/Users/jpoole/gpython/test.py":

def foo(name : str):
return name
foo(
foo(name = "test"))
foo(

Before:

Exception &py.Exception{Base:(*py.Type)(0xc00012dc20), Args:py.Tuple{"invalid syntax"}, Traceback:py.Object(nil), Context:py.Object(nil), Cause:py.Object(nil), SuppressContext:false, Dict:py.StringDict{"filename":"<string>", "line":"", "lineno":10, "offset":0}}
-- No traceback available --
2022/04/10 18:31:19 File "<string>", line 10, offset 0
SyntaxError: 'invalid syntax'

After

Exception File "/Users/jpoole/gpython/test.py", line 10, offset 0
SyntaxError: 'unexpected EOF while parsing'
-- No traceback available --

[sbinet]

apologies for dropping the ball.

LGTM, modulo some tests that need to be fixed.

thanks for the PR.

[Tatskaari]

apologies for dropping the ball.

LGTM, modulo some tests that need to be fixed.

thanks for the PR.

Nice! Fixed the tests up. They pass locally now.

[sbinet]

LGTM.

thanks for sticking with us.

could you send another PR against go-python/license adding yourself to the AUTHORS and/or CONTRIBUTORS file(s) ?

then I'll merge this one in.

thanks again.

[sbinet]

there's one remaining error, though:

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: "name 'aksfjakf' is not defined"
--- FAIL: TestREPL (0.00s)
repl_test.go:32: compileError: Output wrong, want "Compile error: \n File \"<string>\", line 1, offset 2\n if\n\n\nSyntaxError: 'invalid syntax'" got "Compile error: \n File \"<stdin>\", line 1, offset 2\n if\n\n\nSyntaxError: 'invalid syntax'"
FAIL
FAIL	github.com/go-python/gpython/repl	0.003s

[sbinet]

needs go-python/license#17

[sbinet]

I took the liberty of fixing the last remaining error and pushing my changes, so I could merge this PR in :)

thanks a lot.

[codecov]

Codecov Report

Merging #177 (02c67b2) into master (12886a2) will not change coverage.
The diff coverage is 40.00%.

@@ Coverage Diff @@## master #177 +/- ##
=======================================
Coverage 73.22% 73.22% =======================================
Files 72 72 Lines 11765 11765 =======================================
Hits 8615 8615 Misses 2568 2568 Partials 582 582 

Impacted Files	Coverage Δ
main.go	15.62% <0.00%> (ø)
py/traceback.go	22.22% <0.00%> (ø)
compile/compile.go	90.56% <100.00%> (ø)
parser/lexer.go	89.03% <100.00%> (ø)

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[sbinet]

LGTM

[Tatskaari]

I took the liberty of fixing the last remaining error and pushing my changes, so I could merge this PR in :)

thanks a lot.

Oh so sorry! I got distracted and forgot to get back to this one. Thanks for that :)

[sbinet]

no worries :)
(it'd be great to have python-3.x grammar compatibility (where x>4) :P)