src/test_parser.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2008 Jean Privat <jean@pryen.org>
   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 # Program used to test the NIT parser
  18 package test_parser
  19
  20 import parser
  21
  22 class PrintTreeVisitor
  23         super Visitor
  24         var _rank: Int
  25         redef fun visit(n: nullable ANode)
  26         do
  27                 if n == null then return
  28                 if n isa Token then
  29                         printn("  " * _rank, n.to_s, " ... ", n.location, "\n")
  30                 else
  31                         printn("  " * _rank, n.location, "\n")
  32                 end
  33                 _rank = _rank + 1
  34                 n.visit_all(self)
  35                 _rank = _rank - 1
  36         end
  37
  38         init
  39         do
  40                 _rank = 0
  41         end
  42 end
  43
  44 var no_print = false
  45 var only_lexer = false
  46 var need_help = false
  47 var no_file = false
  48
  49 while not args.is_empty and args.first.first == '-' do
  50         if args.first == "-n" then
  51                 no_print = true
  52         else if args.first == "-l" then
  53                 only_lexer = true
  54         else if args.first == "-p" then
  55                 only_lexer = false
  56         else if args.first == "-e" then
  57                 no_file = true
  58         else if args.first == "-h" or args.first == "-?" then
  59                 need_help = true
  60         else
  61                 stderr.write("Unknown option {args.first}.\n")
  62                 exit(0)
  63         end
  64         args.shift
  65 end
  66
  67 if args.is_empty or need_help then
  68         print("usage:")
  69         print("  test_parser [options]... <filename.nit>...")
  70         print("options:")
  71         print("  -n     do not print anything")
  72         print("  -l     only lexer")
  73         print("  -p     lexer and parser (default)")
  74         print("  -e     instead on files, each argument is a content to parse")
  75         print("  -h     print this help")
  76 else
  77         for a in args do
  78                 var source
  79                 if no_file then
  80                         source = new SourceFile.from_string("", a)
  81                 else
  82                         var f = new IFStream.open(a)
  83                         source = new SourceFile(a, f)
  84                         f.close
  85                 end
  86                 var lexer = new Lexer(source)
  87                 if only_lexer then
  88                         var token = lexer.next
  89                         while not token isa EOF do
  90                                 if not no_print then
  91                                         print("Read token at {token.location} text='{token.text}'")
  92                                 end
  93                                 token = lexer.next
  94                         end
  95                 else
  96                         var parser = new Parser(lexer)
  97                         var tree = parser.parse
  98
  99                         var error = tree.n_eof
 100                         if error isa AError then
 101                                 print("Error at {error.location}:\n\t{error.message}")
 102                                 return
 103                         end
 104
 105                         if not no_print then
 106                                 (new PrintTreeVisitor).enter_visit(tree)
 107                         end
 108                 end
 109         end
 110 end