Bash JSON

最新推荐文章于 2024-12-11 08:42:14 发布

转载最新推荐文章于 2024-12-11 08:42:14 发布 · 212 阅读

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原文链接：https://yq.aliyun.com/articles/478049

文章标签：

#json

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#!/usr/bin/env bash
throw () {

  echo "$*" >&2

  exit 1
}

BRIEF=0
LEAFONLY=0
PRUNE=0

usage() {

  echo

  echo "Usage: JSON.sh [-b] [-l] [-p] [-h]"

  echo

  echo "-p - Prune empty. Exclude fields with empty values."

  echo "-l - Leaf only. Only show leaf nodes, which stops data duplication."

  echo "-b - Brief. Combines 'Leaf only' and 'Prune empty' options."

  echo "-h - This help text."

  echo
}

parse_options() {

  set -- "$@"

  local ARGN=$#

  while [ $ARGN -ne 0 ]

  do

    case $1 in

      -h) usage

          exit 0

      ;;

      -b) BRIEF=1

          LEAFONLY=1

          PRUNE=1

      ;;

      -l) LEAFONLY=1

      ;;

      -p) PRUNE=1

      ;;

      ?*) echo "ERROR: Unknown option."

          usage

          exit 0

      ;;

    esac

    shift 1

    ARGN=$((ARGN-1))

  done
}

awk_egrep () {

  local pattern_string=$1

  gawk '{

    while ($0) {

      start=match($0, pattern);

      token=substr($0, start, RLENGTH);

      print token;

      $0=substr($0, start+RLENGTH);

    }

  }' pattern=$pattern_string
}

tokenize () {

  local GREP

  local ESCAPE

  local CHAR

  if echo "test string" | egrep -ao --color=never "test" &>/dev/null

  then

    GREP='egrep -ao --color=never'

  else

    GREP='egrep -ao'

  fi

  if echo "test string" | egrep -o "test" &>/dev/null

  then

    ESCAPE='(\[^u[:cntrl:]]|\u[0-9a-fA-F]{4})'

    CHAR='[^[:cntrl:]"\]'

  else

    GREP=awk_egrep

    ESCAPE='(\\[^u[:cntrl:]]|\u[0-9a-fA-F]{4})'

    CHAR='[^[:cntrl:]"\\]'

  fi

  local STRING=""$CHAR*($ESCAPE$CHAR*)*""

  local NUMBER='-?(0|[1-9][0-9]*)([.][0-9]*)?([eE][+-]?[0-9]*)?'

  local KEYWORD='null|false|true'

  local SPACE='[[:space:]]+'

  $GREP "$STRING|$NUMBER|$KEYWORD|$SPACE|." | egrep -v "^$SPACE$"
}

parse_array () {

  local index=0

  local ary=''

  read -r token

  case "$token" in

    ']') ;;

    *)

      while :

      do

        parse_value "$1" "$index"

        index=$((index+1))

        ary="$ary""$value"

        read -r token

        case "$token" in

          ']') break ;;

          ',') ary="$ary," ;;

          *) throw "EXPECTED , or ] GOT ${token:-EOF}" ;;

        esac

        read -r token

      done

      ;;

  esac

  [ "$BRIEF" -eq 0 ] && value=`printf '[%s]' "$ary"` || value=

  :
}

parse_object () {

  local key

  local obj=''

  read -r token

  case "$token" in

    '}') ;;

    *)

      while :

      do

        case "$token" in

          '"'*'"') key=$token ;;

          *) throw "EXPECTED string GOT ${token:-EOF}" ;;

        esac

        read -r token

        case "$token" in

          ':') ;;

          *) throw "EXPECTED : GOT ${token:-EOF}" ;;

        esac

        read -r token

        parse_value "$1" "$key"

        obj="$obj$key:$value"

        read -r token

        case "$token" in

          '}') break ;;

          ',') obj="$obj," ;;

          *) throw "EXPECTED , or } GOT ${token:-EOF}" ;;

        esac

        read -r token

      done

    ;;

  esac

  [ "$BRIEF" -eq 0 ] && value=`printf '{%s}' "$obj"` || value=

  :
}

parse_value () {

  local jpath="${1:+$1,}$2" isleaf=0 isempty=0 print=0

  case "$token" in

    '{') parse_object "$jpath" ;;

    '[') parse_array  "$jpath" ;;

    # At this point, the only valid single-character tokens are digits.

    ''|[!0-9]) throw "EXPECTED value GOT ${token:-EOF}" ;;

    *) value=$token

       isleaf=1

       [ "$value" = '""' ] && isempty=1

       ;;

  esac

  [ "$value" = '' ] && return

  [ "$LEAFONLY" -eq 0 ] && [ "$PRUNE" -eq 0 ] && print=1

  [ "$LEAFONLY" -eq 1 ] && [ "$isleaf" -eq 1 ] && [ $PRUNE -eq 0 ] && print=1

  [ "$LEAFONLY" -eq 0 ] && [ "$PRUNE" -eq 1 ] && [ "$isempty" -eq 0 ] && print=1

  [ "$LEAFONLY" -eq 1 ] && [ "$isleaf" -eq 1 ] &&

    [ $PRUNE -eq 1 ] && [ $isempty -eq 0 ] && print=1

  [ "$print" -eq 1 ] && printf "[%s]t%sn" "$jpath" "$value"

  :
}

parse () {

  read -r token

  parse_value

  read -r token

  case "$token" in

    '') ;;

    *) throw "EXPECTED EOF GOT $token" ;;

  esac
}

parse_options "$@"

if ([ "$0" = "$BASH_SOURCE" ] || ! [ -n "$BASH_SOURCE" ]);
then

  tokenize | parse
fi