Research for a native port of OVM.

Shell functions to count lines and figure out what happens before
main().

Minor code cleanup as well.

core/cmd_exec.py

@@ -1111,6 +1111,9 @@ def RunCommandSub(self, node):
      e_die('Command sub exited with status %d (%r)', status,
            node.__class__.__name__)

    # Runtime errors test case: # $("echo foo > $@")
    # Why rstrip()?
    # https://unix.stackexchange.com/questions/17747/why-does-shell-command-substitution-gobble-up-a-trailing-newline-char
    return ''.join(chunks).rstrip('\n')

  def RunProcessSub(self, node, op_id):

core/legacy.py

@@ -11,10 +11,10 @@

Other notes:
- How does this compare to awk -F?
- re.split() ?  This appears not to work.
"""

import re
Idea: This is discouraged/legacy, so write it in Oil rather than C++?
Problem: Need both classes and algebraic data types.
"""

from core import runtime
from core import util

core/word_eval.py

@@ -986,33 +986,23 @@ def __init__(self, mem, exec_opts, splitter, ex):

  def _EvalCommandSub(self, node, quoted):
    stdout = self.ex.RunCommandSub(node)

    # Runtime errors test case: # $("echo foo > $@")

    # Why rstrip()?
    # https://unix.stackexchange.com/questions/17747/why-does-shell-command-substitution-gobble-up-a-trailing-newline-char
    return runtime.StringPartValue(stdout, not quoted, not quoted)
    return runtime.StringPartValue(stdout, not quoted)

  def _EvalProcessSub(self, node, id_):
    dev_path = self.ex.RunProcessSub(node, id_)
    # no split or glob
    return runtime.StringPartValue(dev_path, False, False)
    return runtime.StringPartValue(dev_path, False)  # no split or glob


class CompletionWordEvaluator(_WordEvaluator):
  """
  Difference from NormalWordEvaluator: No access to executor!  But they both
  have a splitter.
  """

  def __init__(self, mem, exec_opts, splitter):
    _WordEvaluator.__init__(self, mem, exec_opts, splitter)

  def _EvalCommandSub(self, node, quoted):
    # Just  return a dummy string?
    return runtime.StringPartValue(
        '__COMMAND_SUB_NOT_EXECUTED__', not quoted, not quoted)
    return runtime.StringPartValue('__COMMAND_SUB_NOT_EXECUTED__', not quoted)

  def _EvalProcessSub(self, node, id_):
    return runtime.StringPartValue(
        '__PROCESS_SUB_NOT_EXECUTED__', False, False)
    return runtime.StringPartValue('__PROCESS_SUB_NOT_EXECUTED__', False)

scripts/count.sh

@@ -110,9 +110,14 @@ parser-port() {

runtime() {
  # NOTE: braces.py contains both parsing and runtime.  It is a  middle stage.
  echo 'Core'
  wc -l \
    core/*_{exec,eval}.py core/{process,state}.py core/runtime.asdl | sort -n

  echo 'Runtime'
  wc -l core/{process,state}.py core/runtime.asdl | sort -n
  echo

  # NOTE: These may turn into compilers
  echo 'Evaluators'
  wc -l core/*_{exec,eval}.py | sort -n
  echo

  echo 'Builtins'
@@ -136,4 +141,11 @@ imports() {
  grep --no-filename import */*.py | sort | uniq -c | sort -n
}

# For the compiler, see what's at the top level.
top-level() {
  grep '^[a-zA-Z]' {core,osh}/*.py \
    | grep -v '_test.py'  \
    | egrep -v ':import|from|class|def'  # note: colon is from grep output
}

"$@"