src/program.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2009 Jean-Sebastien Gelinas <calestar@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 # Common things to represent a Nit program/library
  18 package program
  19
  20 import metamodel
  21
  22 # Instances of this class represent a program/library that will
  23 # be analyzed/compiled by nitc
  24 class Program
  25         # This module is the 'main' module, the one where we find the 'main' method
  26         readable var _module: MMModule
  27
  28         # This method is the entry point of this program
  29         # There might be no entry point (if in fact we are compiling a library)
  30         readable var _main_method: nullable MMMethod = null
  31
  32         # This is the class that contains the main method.
  33         # Would be null if there is no main method
  34         readable var _main_class: nullable MMLocalClass = null
  35
  36         fun compute_main_method do
  37                 # Check for the 'Sys' class
  38                 var sysname = once "Sys".to_symbol
  39                 if not module.has_global_class_named(sysname) then return
  40                 var sys = module.class_by_name(sysname)
  41
  42                 # Check for 'Sys::main' method
  43                 var entryname = once "main".to_symbol
  44                 if not sys.has_global_property_by_name(entryname) then return
  45
  46                 _main_method = sys.select_method(entryname)
  47                 _main_class = sys
  48         end
  49
  50         init(m: MMModule) do
  51                 _module = m
  52         end
  53 end