stroke 2.3.2

Utilities for & with strings.

Installing

python3 -m pip install stroke

Useful for creating a simple command based interface

import stroke

commands = stroke.State()

# create command
@commands.sub('echo')
def commands_0(content):

  print(content)

# this is a subcommand
@commands_0.sub('loud')
def commands_0_0(content):

  content = content.upper()

  print(content)

# another subcommand with aliases
@commands_0.sub('pretty', 'aesthetic')
def commands_0_1(content):

  content = ' '.join(iter(content))

  print(content)

def main(content):

  # analyse into names separated by .
  # anything after a space is the argument
  # use the names to find the invoke
  # KeyError will be raised on invalid trail
  (names, argument, invoke) = commands.analyse(content)

  invoke(argument)

main('echo marco') # not polo

main('echo.loud whoa') # > WHOA

main('echo.aesthetic fancy words') # chill vibes

Useful for parsing arguments into parts

import stroke

commands = stroke.State()

figure_0 = {
  '-and': 'int'
}

@commands.sub('add')
def commands_0(content):

  # list of (flag, value)
  arguments = stroke.craft(figure_0, content)

  value = 0

  # flag is always -and
  for (flag, argument) in arguments:

    value += int(argument)

  print('result', value)

figure_1 = {
  '-upper': 'numerator',
  '-lower': 'denominator'
}

@commands.sub('div')
def commands_1(content):

  # same thing
  arguments = stroke.craft(figure_1, content)

  # ignore multiple flags
  arguments = dict(arguments)

  # we need every flag for this one
  values = (arguments[key] for key in figure_1)

  # convert and unpack
  (upper, lower) = map(int, values)

  # handle errors on demand
  value = upper / lower

  print('result', value)

figure_2 = {
  '-and': {
    '-op': 'name',
    '-co': 'args'
  }
}

@commands.sub('calc')
def commands_2(content):

  # this is actually a generator
  arguments = stroke.craft(figure_2, content)

  # here, argument is also one
  for (flag, argument) in arguments:

    # we only need one invoke
    invoke = None

    # can be executed multiple times
    contents = []

    for (flag, argument) in argument:

      # signal for name
      if flag == '-op':

        # ignore empties
        if not argument:

            continue

        # only first
        if not invoke:

          # get the invoke from name
          invoke = commands.trail(argument)

        continue

      # no need to check if -co
      contents.append(argument)

    # execute commands
    for content in contents:

      invoke(content)

def main(content):

  (names, argument, invoke) = commands.analyse(content)

  invoke(argument)

print('>', stroke.draw(figure_0))
main('add 5 -and 9 -and -3') # 11

print('>', stroke.draw(figure_1, full = True))
main('div -upper 20 -lower 2 -upper 15') # 7.5

print('>', stroke.draw(figure_2, full = True))
main('calc add -co 1 \-and 2 -and div -co -upper 1 -lower 4') # 3 and 0.25