contrib/jwrapper/src/jwrapper.nit

   1 # This file is part of NIT (http://www.nitlanguage.org).
   2 #
   3 # Copyright 2014 Frédéric Vachon <fredvac@gmail.com>
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 # jwrapper is a Nit extern class generator `in "Java"`.
  18 # It takes a .class file and output a Nit file. For further details on installation and usage, refer to the README file.
  19 #
  20 # Here's an overview of the project design :
  21 # * Grammar and lexer : `grammar/javap.sablecc`
  22 # * The `javap_visitor` implements the visitor that extracts data from the AST
  23 # * The `code_generator` takes these data and converts it to Nit code via the `jtype_converter` module and generate the output Nit file.
  24 # * The `types` contains data structures used to represent the data
  25 # * The `jwrapper` module implements the user interface
  26 module jwrapper
  27
  28 import opts
  29 import javap_test_parser
  30 import code_generator
  31 import javap_visitor
  32
  33 var opts = new OptionContext
  34
  35 var opt_attr = new OptionBool("Generate attributes", "-a", "--with-attributes")
  36 var opt_comment = new OptionBool("Comment methods/attributes containing unknown types", "-c", "--comment")
  37 var opt_wrap = new OptionBool("Create extern classes wrapping unknown types (Default)", "-w", "--wrap")
  38 var opt_help = new OptionBool("Show this help message", "-h", "--help")
  39
  40 opts.add_option(opt_attr, opt_comment, opt_wrap, opt_help)
  41
  42 opts.parse(args)
  43
  44 if opt_wrap.value and opt_comment.value then
  45         print "Error: Can't use both '-c' and '-w'"
  46         exit 1
  47 end
  48
  49 if not opts.errors.is_empty or opts.rest.length != 2 or opt_help.value then
  50         print "USAGE: jwrapper [OPTIONS] class_file nit_file"
  51         print "Options:"
  52         opts.usage
  53
  54         if opt_help.value then exit 0
  55         exit 1
  56 end
  57
  58 var dot_class = opts.rest[0]
  59 var out_file = opts.rest[1]
  60
  61 if not "javap".program_is_in_path then
  62         print "ERROR: 'javap' not found."
  63         exit 1
  64 end
  65
  66 var javap = new IProcess("javap", "-public", dot_class)
  67
  68 var p = new TestParser_javap
  69 var tree = p.work(javap.read_all)
  70
  71 var converter = new JavaTypeConverter
  72
  73 var visitor = new JavaVisitor(converter)
  74 visitor.enter_visit(tree)
  75
  76 var generator = new CodeGenerator(out_file, visitor.java_class, opt_attr.value, opt_comment.value)
  77 generator.generate