1#!/usr/bin/ruby
2# encoding: utf-8
3
4require 'antlr3/test/functional'
5
6class TestEmptyAlternative < ANTLR3::Test::Functional
7
8  inline_grammar( <<-'END' )
9    grammar EmptyAlt;
10    options {
11      language = Ruby;
12    }
13
14    r
15      : NAME
16        ( WS+ NAME
17        |
18        )
19        EOF
20      ;
21
22    NAME: ('a'..'z') ('a'..'z' | '0'..'9')+;
23    NUMBER: ('0'..'9')+;
24    WS: ' '+;
25  END
26
27  example "rule with empty alternative" do
28    lexer = EmptyAlt::Lexer.new( 'foo' )
29    parser = EmptyAlt::Parser.new lexer
30    events = parser.r
31  end
32
33end
34
35class TestSubrulePrediction < ANTLR3::Test::Functional
36
37  inline_grammar( <<-'END' )
38    grammar Subrule;
39    options {
40      language = Ruby;
41    }
42
43    @parser::members {
44      def emit_error_message(msg)
45        # do nothing
46      end
47      def report_error(error)
48        raise error
49      end
50    }
51
52    a: 'BEGIN' b WS+ 'END';
53    b: ( WS+ 'A' )+;
54    WS: ' ';
55  END
56
57  example "make correct predictions involving subrules" do
58    lexer = Subrule::Lexer.new( 'BEGIN A END' )
59    parser = Subrule::Parser.new lexer
60    events = parser.a
61  end
62
63end
64
65
66class TestSpecialStates < ANTLR3::Test::Functional
67
68  inline_grammar( <<-'END' )
69    grammar SpecialStates;
70    options { language = Ruby; }
71
72    @init { @cond = true }
73
74    @members {
75      attr_accessor :cond
76      def recover(re)
77        raise re
78      end
79    }
80
81    r
82      : ( { @cond }? NAME
83        | {!@cond }? NAME WS+ NAME
84        )
85        ( WS+ NAME )?
86        EOF
87      ;
88
89    NAME: ('a'..'z') ('a'..'z' | '0'..'9')+;
90    NUMBER: ('0'..'9')+;
91    WS: ' '+;
92  END
93
94  example "parsing 'foo'" do
95    lexer  = SpecialStates::Lexer.new 'foo'
96    parser = SpecialStates::Parser.new lexer
97    parser.r
98  end
99
100  example "parsing 'foo name1'"  do
101    lexer = SpecialStates::Lexer.new 'foo name1'
102    parser = SpecialStates::Parser.new lexer
103    parser.r
104  end
105
106  example "parsing 'bar name1'"  do
107    lexer = SpecialStates::Lexer.new 'bar name1'
108    parser = SpecialStates::Parser.new lexer
109    parser.cond = false
110    parser.r
111  end
112
113  example "parsing 'bar name1 name2'" do
114    lexer = SpecialStates::Lexer.new 'bar name1 name2'
115    parser = SpecialStates::Parser.new lexer
116    parser.cond = false
117    parser.r
118  end
119end
120
121
122class TestDFABug < ANTLR3::Test::Functional
123
124  inline_grammar( <<-'END' )
125    grammar DFABug;
126    options {
127        language = Ruby;
128        output = AST;
129    }
130
131
132    // this rule used to generate an infinite loop in DFA.predict
133    r
134    options { backtrack=true; }
135        : (modifier+ INT)=> modifier+ expression
136        | modifier+ statement
137        ;
138
139    expression
140        : INT '+' INT
141        ;
142
143    statement
144        : 'fooze'
145        | 'fooze2'
146        ;
147
148    modifier
149        : 'public'
150        | 'private'
151        ;
152
153    ID : 'a'..'z' + ;
154    INT : '0'..'9' +;
155    WS: (' ' | '\n' | '\t')+ {$channel = HIDDEN;};
156  END
157
158  example "testing for DFA-based decision bug" do
159    lexer = DFABug::Lexer.new 'public fooze'
160    parser = DFABug::Parser.new lexer
161    parser.r
162  end
163
164end
165