source: app/src/lib/ttrans.h @ 0e3df7e

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Last change on this file since 0e3df7e was 25ae32e, checked in by obrebski <obrebski@…>, 17 years ago

git-svn-id: svn://atos.wmid.amu.edu.pl/utt@4 e293616e-ec6a-49c2-aa92-f4a8b91c5d16

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1#ifndef _TTransi_h
2#define _TTransi_h
3//---------------------------------------------------------------------------
4#include <iostream.h>
5//---------------------------------------------------------------------------
6
7//! The template for a transition with input and output symbols stored internally.
8/*!
9    A state is identified with the set of its outgoing transitions.
10    The state index is the index of the first transition for it.
11    A state with no outgoing transition is represented as an empty transition.
12*/
13template<class I, class Ipass, class O, class Opass>
14class TTrans_i
15{
16public:
17//private:
18//! Input symbol
19  I i;
20//! Output symbol
21  O o;
22
23public:
24
25//! state is final
26  static const unsigned char BITf=0x01;
27//! transition list is continued
28  static const unsigned char BITc=0x02;
29//! no transition
30  static const unsigned char BITe=0x04;
31//! epsilon input
32  static const unsigned char BITepsi=0x08;
33//! default input
34  static const unsigned char BITdefi=0x10;
35//! epsilon output
36  static const unsigned char BITepso=0x20;
37//! default output
38  static const unsigned char BITdefo=0x40;
39
40//! Flags
41  unsigned char flags;
42
43//! The index of the next state
44  long nxt;
45
46//! Input symbol.
47//! \return The input symbol of the transition.
48  Ipass in() const { return i; }
49
50//! Output symbol.
51//! \return The output symbol of the transition.
52  Opass out() const { return o; }
53
54//! Set the input symbol.
55//! \param in input symbol
56  void in(Ipass in) { i=in; }
57
58//! Set the output symbol.
59//! \param out output symbol
60  void out(Opass out) { o=out; }
61
62//! remark Is this needed?
63  I& iref() { return i; }
64
65//! remark Is this needed?
66  O& oref() { return o; }
67
68//! Test whether an input symbol is accepted.
69//! \remark Simplified. Should rely on a test function provided by the user.
70  bool accepts(Ipass in) { return defi() || in==i; }
71
72//! Next state.
73//! \return Destination state of the transition.
74  long next() const { return nxt; };
75
76//! Set the next state.
77//! \param t destination state of the transition
78  void next(long t) { nxt=t; };
79
80//! Is the state final?
81//! \return \c true if the state is final, false otherwise.
82  bool final() const { return flags&BITf; };
83
84//! Set the \b final flag.
85//! \param b \c true if the state is final, \c false otherwise.
86  void final(bool b) { if(b) flags|=BITf; else flags&=~BITf; };
87
88//! Is the transition list continued?
89//! \return \c true if the transition is not the last transition for the state,
90//! \c false otherwise.
91  bool continued() const { return flags&BITc; };
92
93//! Set the \b continuation flag.
94//! \param b \c true if the transition is not the last one for the state, \c false otherwise.
95  void continued(bool b) { if(b) flags|=BITc; else flags&=~BITc; };
96
97//! Is the transition empty?
98//! \return \c true if the transition is empty (represents a state with no outgoing transitions),
99//! \c false otherwise.
100  bool empty() const { return flags&BITe; };
101
102//! Set the \b empty flag.
103//! \param b \c true if the transition is empty, \c false otherwise.
104  void empty(bool b) { if(b) flags|=BITe; else flags&=~BITe; };
105
106  bool epsi() const { return flags&BITepsi; };
107  void epsi(bool b) { if(b) flags|=BITepsi; else flags&=~BITepsi; };
108
109  bool defi() const { return flags&BITdefi; };
110  void defi(bool b) { if(b) flags|=BITdefi; else flags&=~BITdefi; };
111
112  bool epso() const { return flags&BITepso; };
113  void epso(bool b) { if(b) flags|=BITepso; else flags&=~BITepso; };
114
115  bool defo() const { return flags&BITdefo; };
116  void defo(bool b) { if(b) flags|=BITdefo; else flags&=~BITdefo; };
117
118  void geti(istream&);
119  void geto(istream&);
120
121//  friend ostream& operator<<(ostream& os, const TTrans_i<I,Ipass,O,Opass>& t);
122
123};
124
125//---------------------------------------------------------------------------
126
127template<char>
128void getsym(istream& is, char& c)
129{
130  is >> c;
131  if(c=='\\')
132    {
133      is.get(c);
134      switch(c)
135      {
136        case 'n':c='\n';break;
137        case 't':c='\t';break;
138      }
139    }
140}
141
142template<class T>
143void getsym(istream& is, T& s)
144{ is >> s; }
145
146//---------------------------------------------------------------------------
147
148template<class I, class Ipass, class O, class Opass>
149void TTrans_i<I,Ipass,O,Opass>::geti(istream& is)
150{ getsym<I>(is,iref()); };
151
152template<class I, class Ipass, class O, class Opass>
153void TTrans_i<I,Ipass,O,Opass>::geto(istream& is)
154{ getsym<I>(is,oref()); };
155
156//---------------------------------------------------------------------------
157/*
158template<class I, class Ipass, class O, class Opass>
159ostream& operator<<(ostream& os, const TTrans_i<I,Ipass,O,Opass>& t)
160{
161  os << (t.final() ? '+' : '-');
162  os << ' ';
163
164  if(!t.empty())
165  {
166    if(t.defi())
167      os << (t.epsi() ? '~' : '@');
168    else
169      switch(t.in())
170      {
171        case ' ': os << "\\ "; break;
172        case '\n': os << "\\n"; break;
173        case '\t': os << "\\t"; break;
174        default:   os << t.in();
175      }
176
177    os << '/';
178
179    if(t.defo())
180      os << (t.epso() ? '~' : '@');
181    else
182      switch(t.out())
183      {
184        case ' ': os << "\\ "; break;
185        case '\n': os << "\\n"; break;
186        case '\t': os << "\\t"; break;
187        default:   os << t.out();
188      }
189
190    os << ' ' << t.next();
191  }
192
193  os << '\n';
194
195  if(!t.continued())
196    os << '\n';
197
198  return os;
199}
200*/
201
202//---------------------------------------------------------------------------
203#endif
204
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