Filter.sh

   1 #!/usr/bin/env bash
   2
   3 # Cycript - Optimizing JavaScript Compiler/Runtime
   4 # Copyright (C) 2009-2015  Jay Freeman (saurik)
   5
   6 # GNU Affero General Public License, Version 3 {{{
   7 #
   8 # This program is free software: you can redistribute it and/or modify
   9 # it under the terms of the GNU Affero General Public License as published by
  10 # the Free Software Foundation, either version 3 of the License, or
  11 # (at your option) any later version.
  12 #
  13 # This program is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU Affero General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU Affero General Public License
  19 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 # }}}
  21
  22 file=$1
  23 shift
  24
  25 filters=("$@")
  26
  27 function include() {
  28     file=$1
  29     shift
  30
  31     dir=/${file}
  32     dir=${dir%/*}
  33     dir=${dir:-/.}
  34     dir=${dir#/}
  35     dir=${dir}/
  36
  37     while IFS= read -r line; do
  38         if false; then :
  39         elif [[ ${line} = @if* ]]; then
  40             line=${line#@if }
  41             for name in "${filters[@]}"; do
  42                 if [[ ${line} = ${name}' '* ]]; then
  43                     echo "${line#${name} }"
  44                 fi
  45             done
  46         elif [[ ${line} = @begin* ]]; then
  47             set ${line}; shift
  48             filter=
  49             for name in "${filters[@]}"; do
  50                 for side in "$@"; do
  51                     if [[ ${name} == ${side} ]]; then
  52                         unset filter
  53                     fi
  54                 done
  55             done
  56         elif [[ ${line} = @else ]]; then
  57             if [[ -z ${filter+@} ]]; then
  58                 unset filter
  59             else
  60                 filter=
  61             fi
  62         elif [[ ${line} = @end ]]; then
  63             unset filter
  64         elif [[ ${line} = @include* ]]; then
  65             line=${line#@include }
  66             include "${dir}${line}"
  67         elif [[ -z ${filter+@} ]]; then
  68             echo "${line}"
  69         fi
  70     done <"${file}"
  71 }
  72
  73 include "${file}"