tests/test-contrib-testparseutil.t

rust-performance: introduce FastHashMap type alias for HashMap

Rust's default hashing is slow, because it is meant for preventing collision
attacks.
For all of the current Rust code, we don't care about those attacks, because
if an person with bad intentions has write access to your repo, you have other
issues.

I've chosen to use the TwoXHash crate because it was made by a reputable member
of the Rust community and has very good benchmarks.

For now it does not seem to improve performance by much for the current code,
but it's something else to not worry about when benchmarking code: in a
previous experiment with copytracing in Rust, it accounted for more than 10%
of the time of the entire script.

Differential Revision: https://phab.mercurial-scm.org/D7116

  $ testparseutil="$TESTDIR"/../contrib/testparseutil.py

Internal test by doctest

  $ "$PYTHON" -m doctest "$testparseutil"

Tests for embedded python script

Typical cases

  $ "$PYTHON" "$testparseutil" -v pyembedded <<NO_CHECK_EOF
  >   >>> for f in [1, 2, 3]:
  >   ...     foo = 1
  >   >>> foo = 2
  >   $ echo "doctest is terminated by command, empty line, or comment"
  >   >>> foo = 31
  >   expected output of doctest fragment
  >   >>> foo = 32
  >   
  >   >>> foo = 33
  > 
  >   >>> foo = 34
  > comment
  >   >>> foo = 35
  > 
  >   $ "\$PYTHON" <<EOF
  >   > foo = 4
  >   > 
  >   > EOF
  >   $ cat > foo.py <<EOF
  >   > foo = 5
  >   > EOF
  >   $ cat >> foo.py <<EOF
  >   > foo = 6 # appended
  >   > EOF
  > 
  > NO_CHECK_EOF limit mark makes parsing ignore corresponded fragment
  > (this is useful to use bad code intentionally)
  > 
  >   $ "\$PYTHON" <<NO_CHECK_EOF
  >   > foo = 7 # this should be ignored at detection
  >   > NO_CHECK_EOF
  >   $ cat > foo.py <<NO_CHECK_EOF
  >   > foo = 8 # this should be ignored at detection
  >   > NO_CHECK_EOF
  > 
  > doctest fragment ended by EOF
  > 
  >   >>> foo = 9
  > NO_CHECK_EOF
  <stdin>:1: <anonymous> starts
    |for f in [1, 2, 3]:
    |    foo = 1
    |foo = 2
  <stdin>:4: <anonymous> ends
  <stdin>:5: <anonymous> starts
    |foo = 31
    |
    |foo = 32
    |
    |foo = 33
  <stdin>:10: <anonymous> ends
  <stdin>:11: <anonymous> starts
    |foo = 34
  <stdin>:12: <anonymous> ends
  <stdin>:13: <anonymous> starts
    |foo = 35
  <stdin>:14: <anonymous> ends
  <stdin>:16: <anonymous> starts
    |foo = 4
    |
  <stdin>:18: <anonymous> ends
  <stdin>:20: foo.py starts
    |foo = 5
  <stdin>:21: foo.py ends
  <stdin>:23: foo.py starts
    |foo = 6 # appended
  <stdin>:24: foo.py ends
  <stdin>:38: <anonymous> starts
    |foo = 9
  <stdin>:39: <anonymous> ends

Invalid test script

(similar test for shell script and hgrc configuration is omitted,
because this tests common base class of them)

  $ "$PYTHON" "$testparseutil" -v pyembedded <<NO_CHECK_EOF > detected
  >   $ "\$PYTHON" <<EOF
  >   > foo = 1
  > 
  >   $ "\$PYTHON" <<EOF
  >   > foo = 2
  >   $ cat > bar.py <<EOF
  >   > bar = 2 # this fragment will be detected as expected
  >   > EOF
  > 
  >   $ cat > foo.py <<EOF
  >   > foo = 3
  > NO_CHECK_EOF
  <stdin>:3: unexpected line for "heredoc python invocation"
  <stdin>:6: unexpected line for "heredoc python invocation"
  <stdin>:11: unexpected end of file for "heredoc .py file"
  [1]
  $ cat detected
  <stdin>:7: bar.py starts
    |bar = 2 # this fragment will be detected as expected
  <stdin>:8: bar.py ends

Tests for embedded shell script

  $ "$PYTHON" "$testparseutil" -v shembedded <<NO_CHECK_EOF
  >   $ cat > foo.sh <<EOF
  >   > foo = 1
  >   > 
  >   > foo = 2
  >   > EOF
  >   $ cat >> foo.sh <<EOF
  >   > foo = 3 # appended
  >   > EOF
  > 
  > NO_CHECK_EOF limit mark makes parsing ignore corresponded fragment
  > (this is useful to use bad code intentionally)
  > 
  >   $ cat > foo.sh <<NO_CHECK_EOF
  >   > # this should be ignored at detection
  >   > foo = 4
  >   > NO_CHECK_EOF
  > 
  > NO_CHECK_EOF
  <stdin>:2: foo.sh starts
    |foo = 1
    |
    |foo = 2
  <stdin>:5: foo.sh ends
  <stdin>:7: foo.sh starts
    |foo = 3 # appended
  <stdin>:8: foo.sh ends

Tests for embedded hgrc configuration

  $ "$PYTHON" "$testparseutil" -v hgrcembedded <<NO_CHECK_EOF
  >   $ cat > .hg/hgrc <<EOF
  >   > [ui]
  >   > verbose = true
  >   > 
  >   > # end of local configuration
  >   > EOF
  > 
  >   $ cat > \$HGRCPATH <<EOF
  >   > [extensions]
  >   > rebase =
  >   > # end of global configuration
  >   > EOF
  > 
  >   $ cat >> \$HGRCPATH <<EOF
  >   > # appended
  >   > [extensions]
  >   > rebase =!
  >   > EOF
  > 
  > NO_CHECK_EOF limit mark makes parsing ignore corresponded fragment
  > (this is useful to use bad code intentionally)
  > 
  >   $ cat > .hg/hgrc <<NO_CHECK_EOF
  >   > # this local configuration should be ignored at detection
  >   > [ui]
  >   > username = foo bar
  >   > NO_CHECK_EOF
  > 
  >   $ cat > \$HGRCPATH <<NO_CHECK_EOF
  >   > # this global configuration should be ignored at detection
  >   > [extensions]
  >   > foobar =
  >   > NO_CHECK_EOF
  > NO_CHECK_EOF
  <stdin>:2: .hg/hgrc starts
    |[ui]
    |verbose = true
    |
    |# end of local configuration
  <stdin>:6: .hg/hgrc ends
  <stdin>:9: $HGRCPATH starts
    |[extensions]
    |rebase =
    |# end of global configuration
  <stdin>:12: $HGRCPATH ends
  <stdin>:15: $HGRCPATH starts
    |# appended
    |[extensions]
    |rebase =!
  <stdin>:18: $HGRCPATH ends