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'''Code for parsing a command line in Bash, version 2'''
from collections import namedtuple
from . import utils
from . import shell
from .str_utils import indent
from .bash_parser_subcommand_code import make_subcommand_switch_code, get_subcommand_path
from .preprocessor import preprocess
_PARSER_CODE = '''\
#ifdef positionals
POSITIONALS=()
#endif
END_OF_OPTIONS=0
local cmd="root" argi arg i char trailing_chars VAR ARGS
%FIND_OPTION_CODE%
__append_to_array() {
local -n arr=$1
arr+=("$2")
}
for ((argi=1; argi < ${#words[@]} - 1; ++argi)); do
arg="${words[argi]}"
case "$arg" in
--)
END_OF_OPTIONS=1
#ifdef positionals
POSITIONALS+=("${words[@]:$((++argi))}")
#endif
return;;
#ifdef long_options
--*=*)
if __find_option "$cmd" "${arg%%=*}"
then __append_to_array "$VAR" "${arg#*=}"
fi;;
--*)
if __find_option "$cmd" "$arg"; then
if [[ "$ARGS" == 1 ]]
then __append_to_array "$VAR" "${words[++argi]}"
else __append_to_array "$VAR" "_OPT_ISSET_"
fi
fi;;
#else
--*);;
#endif
-?*) # ignore '-'
#ifdef old_options
if [[ "$arg" == -*=* ]]; then
if __find_option "$cmd" "${arg%%=*}"; then
__append_to_array "$VAR" "${arg#*=}"
continue
fi
fi
if __find_option "$cmd" "$arg"; then
if [[ "$ARGS" == 1 ]]
then __append_to_array "$VAR" "${words[++argi]}"
else __append_to_array "$VAR" "_OPT_ISSET_"
fi
continue
fi
#endif
#ifdef short_options
for ((i=1; i < ${#arg}; ++i)); do
char="${arg:$i:1}"
trailing_chars="${arg:$((i + 1))}"
if __find_option "$cmd" "-$char"; then
if [[ "$ARGS" == 1 ]]; then
if [[ -n "$trailing_chars" ]]
then __append_to_array "$VAR" "$trailing_chars"
else __append_to_array "$VAR" "${words[++argi]}"
fi
break;
#ifdef short_optionals
elif [[ "$ARGS" == '?' ]]; then
if [[ -n "$trailing_chars" ]]
then __append_to_array "$VAR" "$trailing_chars"
else __append_to_array "$VAR" _OPT_ISSET_
fi
break;
#endif
else
__append_to_array "$VAR" "_OPT_ISSET_"
fi
fi
done
#endif
;;
#ifdef positionals
*)
POSITIONALS+=("$arg")
%SUBCOMMAND_SWITCH_CODE%
;;
#endif
esac
done
#ifdef positionals
for ((; argi < ${#words[@]}; ++argi)); do
case "${words[argi]}" in
-?*);;
*) POSITIONALS+=("${words[argi]}");;
esac
done
#endif'''
_OPT_ISSET = '_OPT_ISSET_'
def _make_find_option_code(commandline, variable_manager):
cmdlines = list(reversed(commandline.get_all_commandlines()))
code = []
if len(cmdlines) == 1:
code += [_make_cmd_plus_option_switch_code(cmdlines[0], variable_manager, True)]
else:
for cmdline in cmdlines:
code += [_make_cmd_plus_option_switch_code(cmdline, variable_manager)]
c = '__find_option() {\n'
c += '%s\n' % indent('\n'.join(filter(None, code)), 2)
c += ' return 1\n'
c += '}'
return c
def _make_cmd_plus_option_switch_code(commandline, variable_manager, omit_cmd_check=False):
option_cases = _generate_option_cases(commandline, variable_manager)
if not option_cases:
return None
if omit_cmd_check:
return _make_option_switch_code(option_cases)
command = get_subcommand_path(commandline)
command = shell.escape(command)
if commandline.inherit_options:
command += '*'
c = f'case "$1" in {command})\n'
c += '%s\n' % indent(_make_option_switch_code(option_cases), 2)
c += 'esac'
return c
def _make_option_switch_code(option_cases):
c = 'case "$2" in\n'
for case in option_cases:
c += ' %s)' % '|'.join(case.option_strings)
c += ' VAR=%s;' % case.variable
c += ' ARGS=%s;' % case.args
c += ' return;;\n'
c += 'esac'
return c
def generate(commandline, variable_manager):
find_option_code = _make_find_option_code(commandline, variable_manager)
subcommand_switch_code = make_subcommand_switch_code(commandline)
defines = []
types = utils.get_defined_option_types(commandline)
if types.short:
defines.append('short_options')
if types.long:
defines.append('long_options')
if types.old:
defines.append('old_options')
if types.short_optional:
defines.append('short_optionals')
if types.positionals:
defines.append('positionals')
s = preprocess(_PARSER_CODE, defines)
if subcommand_switch_code:
s = s.replace('%SUBCOMMAND_SWITCH_CODE%', indent(subcommand_switch_code, 6))
else:
s = s.replace('%SUBCOMMAND_SWITCH_CODE%\n', '')
if find_option_code:
s = s.replace('%FIND_OPTION_CODE%', find_option_code)
else:
s = s.replace('%FIND_OPTION_CODE%\n', '')
return s
def _generate_option_cases(commandline, variable_manager):
OptionCase = namedtuple('OptionCase', ['option_strings', 'variable', 'args'])
options = commandline.get_options()
abbreviations = utils.get_option_abbreviator(commandline)
option_cases = []
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()
value_variable = variable_manager.capture_variable(option)
if option.complete and option.optional_arg is True:
args = "'?'"
elif option.complete:
args = '1'
else:
args = '0'
option_cases.append(OptionCase(short_options + long_options, value_variable, args))
return option_cases
|
