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'''Code for parsing a command line in Bash.'''
from collections import namedtuple
from . import utils
from .str_utils import indent
from .bash_utils import make_option_variable_name, CasePatterns
from .bash_parser_subcommand_code import make_subcommand_switch_code, get_subcommand_path
_PARSER_CODE = '''\
POSITIONALS=()
END_OF_OPTIONS=0
local cmd="root" argi arg i char trailing_chars
for ((argi=1; argi < ${#words[@]} - 1; ++argi)); do
arg="${words[argi]}"
case "$arg" in
--)
END_OF_OPTIONS=1
POSITIONALS+=("${words[@]:$((++argi))}")
return;;
-?*) # ignore '-'
%LONG_OPTION_CASES%
for ((i=1; i < ${#arg}; ++i)); do
char="${arg:$i:1}"
trailing_chars="${arg:$((i + 1))}"
%SHORT_OPTION_CASES%
done;;
*)
POSITIONALS+=("$arg")
%SUBCOMMAND_SWITCH_CODE%
;;
esac
done
for ((; argi < ${#words[@]}; ++argi)); do
case "${words[argi]}" in
-?*);;
*) POSITIONALS+=("${words[argi]}");;
esac
done'''
_OPT_ISSET = '_OPT_ISSET_'
def generate(commandline, variable_manager):
commandlines = list(reversed(commandline.get_all_commandlines()))
subcommand_switch_code = make_subcommand_switch_code(commandline)
long_option_cases = []
short_option_cases = []
for commandline in commandlines:
option_cases = _generate_option_cases(commandline, variable_manager)
command = get_subcommand_path(commandline)
if commandline.inherit_options:
command += '*'
if option_cases.long_options:
r = 'case "$cmd" in %s)\n' % command
r += ' case "$arg" in\n'
for case in option_cases.long_options:
r += '%s\n' % indent(case, 4)
r += ' esac\n'
r += 'esac'
long_option_cases.append(r)
if option_cases.short_options:
r = 'case "$cmd" in %s)\n' % command
r += ' case "$char" in\n'
for case in option_cases.short_options:
r += '%s\n' % indent(case, 4)
r += ' esac\n'
r += 'esac'
short_option_cases.append(r)
s = _PARSER_CODE
if long_option_cases:
s = s.replace('%LONG_OPTION_CASES%', indent('\n\n'.join(long_option_cases), 6))
else:
s = s.replace('%LONG_OPTION_CASES%\n', '')
if short_option_cases:
s = s.replace('%SHORT_OPTION_CASES%', indent('\n\n'.join(short_option_cases), 8))
else:
s = s.replace('%SHORT_OPTION_CASES%\n', '')
if subcommand_switch_code:
s = s.replace('%SUBCOMMAND_SWITCH_CODE%', indent(subcommand_switch_code, 6))
else:
s = s.replace('%SUBCOMMAND_SWITCH_CODE%\n', '')
return s
def _make_long_option_case(long_options, option, variable):
r = ''
if option.complete and option.optional_arg is True:
r += '%s)\n' % CasePatterns.for_long_without_arg(long_options)
r += ' %s+=(%s);\n' % (variable, _OPT_ISSET)
r += ' continue;;\n'
r += '%s)\n' % CasePatterns.for_long_with_arg(long_options)
r += ' %s+=("${arg#*=}")\n' % variable
r += ' continue;;'
elif option.complete:
r += '%s)\n' % CasePatterns.for_long_without_arg(long_options)
r += ' %s+=("${words[++argi]}")\n' % variable
r += ' continue;;\n'
r += '%s)\n' % CasePatterns.for_long_with_arg(long_options)
r += ' %s+=("${arg#*=}")\n' % variable
r += ' continue;;'
else:
r += '%s)\n' % CasePatterns.for_long_without_arg(long_options)
r += ' %s+=(%s)\n' % (variable, _OPT_ISSET)
r += ' continue;;'
return r
def _make_short_option_case(short_options, option, variable):
r = ''
if option.complete and option.optional_arg is True:
r += '%s)\n' % CasePatterns.for_short(short_options)
r += ' if [[ -n "$trailing_chars" ]]\n'
r += ' then %s+=("$trailing_chars")\n' % variable
r += ' else %s+=(%s)\n' % (variable, _OPT_ISSET)
r += ' fi\n'
r += ' continue 2;;'
elif option.complete:
r += '%s)\n' % CasePatterns.for_short(short_options)
r += ' if [[ -n "$trailing_chars" ]]\n'
r += ' then %s+=("$trailing_chars")\n' % variable
r += ' else %s+=("${words[++argi]}")\n' % variable
r += ' fi\n'
r += ' continue 2;;'
else:
r += '%s)\n' % CasePatterns.for_short(short_options)
r += ' %s+=(%s);;' % (variable, _OPT_ISSET)
return r
def _generate_option_cases(commandline, variable_manager):
OptionCases = namedtuple('OptionCases', ['long_options', 'short_options'])
options = commandline.get_options()
abbreviations = utils.get_option_abbreviator(commandline)
option_cases = OptionCases([], [])
for option in options:
long_options = abbreviations.get_many_abbreviations(option.get_long_option_strings())
long_options += abbreviations.get_many_abbreviations(option.get_old_option_strings())
short_options = option.get_short_option_strings()
variable = variable_manager.capture_variable(option)
if long_options:
option_cases.long_options.append(
_make_long_option_case(long_options, option, variable))
if short_options:
option_cases.short_options.append(
_make_short_option_case(short_options, option, variable))
return option_cases
|
