rule-tracing.rb revision 324c4644fee44b9898524c09511bd33c3f12e2df 
1#!/usr/bin/ruby
2# encoding: utf-8
3
4require 'antlr3/test/functional'
5
6class TestRuleTracing < ANTLR3::Test::Functional
7
8  inline_grammar( <<-'END' )
9    grammar Traced;
10    options {
11      language = Ruby;
12    }
13    
14    @parser::init {
15      @stack = nil
16      @traces = []
17    }
18    
19    @parser::members {
20      attr_accessor :stack, :traces
21      
22      def trace_in(rule_name, rule_index)
23        @traces << ">#{rule_name}"
24      end
25      
26      def trace_out(rule_name, rule_index)
27        @traces << "<#{rule_name}"
28      end
29    }
30    
31    @lexer::init {
32      @stack = nil
33      @traces = []
34    }
35    
36    @lexer::members {
37      attr_accessor :stack, :traces
38      
39      def trace_in(rule_name, rule_index)
40        @traces << ">#{rule_name}"
41      end
42      
43      def trace_out(rule_name, rule_index)
44        @traces << "<#{rule_name}"
45      end
46    }
47    
48    a: '<' ((INT '+')=>b|c) '>';
49    b: c ('+' c)*;
50    c: INT ;
51    
52    INT: ('0'..'9')+;
53    WS: (' ' | '\n' | '\t')+ {$channel = HIDDEN;};
54  END
55
56  compile_options :trace => true
57  
58  example "setting up rule tracing" do
59    lexer = Traced::Lexer.new( '< 1 + 2 + 3 >' )
60    parser = Traced::Parser.new lexer
61    parser.a
62    lexer.traces.should == [ 
63            '>t__6!', '<t__6!', '>ws!', '<ws!', '>int!', '<int!', '>ws!', '<ws!',
64            '>t__8!', '<t__8!', '>ws!', '<ws!', '>int!', '<int!', '>ws!', '<ws!',
65            '>t__8!', '<t__8!', '>ws!', '<ws!', '>int!', '<int!', '>ws!', '<ws!',
66            '>t__7!', '<t__7!'
67    ]
68    parser.traces.should == [ 
69      '>a', '>synpred1_Traced', '<synpred1_Traced',
70      '>b', '>c', '<c', '>c', '<c', '>c', '<c', '<b', '<a'
71    ]
72  end
73end
74