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Current File : /usr/share/zsh/5.0.2/functions/_regex_arguments
#autoload

## usage: _regex_arguments funcname regex

# _regex_arguments compiles `regex' and emits the result of the state
# machine into the function `funcname'. `funcname' parses a command line
# according to `regex' and evaluates appropriate actions in `regex'. Before
# parsing the command line string is generated by concatenating `words'
# (before `PREFIX') and `PREFIX' with a separator NUL ($'\0').

# The `regex' is defined as follows.

## regex word definition:

# pattern = "/" ( glob | "[]" ) "/" [ "+" | "-" ]
# lookahead = "%" glob "%"
# guard = "-" zsh-code-to-eval
# caction = ":" tag ":" descr ":" zsh-code-to-eval
# action = "{" zsh-code-to-eval "}"

## regex word sequence definition:

# element = pattern [ lookahead ] [ guard ] [ caction ]
# 
# regex = element 
#	| "(" regex ")"
#	| regex "#"
#	| ( regex | action ) #
#	| regex "|" regex

# example:

# compdef _tst tst

# _regex_arguments _tst /$'[^\0]#\0'/ /$'[^\0]#\0'/ :'compadd aaa'
#  _tst complete `aaa' for first argument.
#  First $'[^\0]#\0' is required to match with command name.

# _regex_arguments _tst /$'[^\0]#\0'/ \( /$'[^\0]#\0'/ :'compadd aaa' /$'[^\0]#\0'/ :'compadd bbb' \) \#
#  _tst complete `aaa' for (2i+1)th argument and `bbb' for (2i)th argument.

# _regex_arguments _tst /$'[^\0]#\0'/ \( /$'[^\0]#\0'/ :'compadd aaa' \| /$'[^\0]#\0'/ :'compadd bbb' \) \#
#  _tst complete `aaa' or `bbb'.

## Recursive decent regex parser

# return status of parser functions:

# 0 : success
# 1 : parse error
# 2 : fatal parse error

_ra_comp () {
  _ra_actions=("$_ra_actions[@]" "$1")
}

_regex_arguments () {
  local regex funcname="$1"
  shift
  regex=(${@:/(#b):(*)/":_ra_comp ${(qqqq)match[1]}"})

  eval \
  "$funcname"' () {
    local _ra_p1 _ra_p2 _ra_left _ra_right _ra_com expl tmp nm="$compstate[nmatches]"
    local _ra_actions _ra_line="${(pj:\0:)${(@)words[1,CURRENT - 1]:Q}}"$'\''\0'\''"$PREFIX"
    _ra_actions=()
    zregexparse -c _ra_p1 _ra_p2 "$_ra_line" '"${(j: :)${(qqqq)regex[@]}}"'
    case "$?" in
    0|2) _message "no more arguments";;
    1) 
      if [[ "$_ra_line[_ra_p1 + 1, -1]" = *$'\''\0'\''* ]]; then
	_message "parse failed before current word"
      else
	_ra_left="$_ra_line[_ra_p1 + 1, _ra_p2]"
	_ra_right="$_ra_line[_ra_p2 + 1, -1]"
	compset -p $(( $#PREFIX - $#_ra_line + $_ra_p1 ))
	(( $#_ra_actions )) && _alternative "$_ra_actions[@]"
      fi
      ;;
    3) _message "invalid regex";;
    esac
    [[ nm -ne "$compstate[nmatches]" ]]
  }'
}

_regex_arguments "$@"

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