1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
// draw.h
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Copyright 2005-2010 Google, Inc.
// Author: allauzen@google.com (Cyril Allauzen)
//
// \file
// Class to draw a binary FST by producing a text file in dot format,
// helper class to fstdraw.cc
#ifndef FST_SCRIPT_DRAW_IMPL_H_
#define FST_SCRIPT_DRAW_IMPL_H_
#include <sstream>
#include <string>
#include <fst/script/fst-class.h>
#include <fst/fst.h>
#include <fst/util.h>
namespace fst {
// Print a binary Fst in the dot textual format, helper class for fstdraw.cc
// WARNING: Stand-alone use not recommend.
template <class A> class FstDrawer {
public:
typedef A Arc;
typedef typename A::StateId StateId;
typedef typename A::Label Label;
typedef typename A::Weight Weight;
FstDrawer(const Fst<A> &fst,
const SymbolTable *isyms,
const SymbolTable *osyms,
const SymbolTable *ssyms,
bool accep,
string title,
float width,
float height,
bool portrait,
bool vertical,
float ranksep,
float nodesep,
int fontsize,
int precision,
bool show_weight_one)
: fst_(fst), isyms_(isyms), osyms_(osyms), ssyms_(ssyms),
accep_(accep && fst.Properties(kAcceptor, true)), ostrm_(0),
title_(title), width_(width), height_(height), portrait_(portrait),
vertical_(vertical), ranksep_(ranksep), nodesep_(nodesep),
fontsize_(fontsize), precision_(precision),
show_weight_one_(show_weight_one) {}
// Draw Fst to an output buffer (or stdout if buf = 0)
void Draw(ostream *strm, const string &dest) {
ostrm_ = strm;
dest_ = dest;
StateId start = fst_.Start();
if (start == kNoStateId)
return;
PrintString("digraph FST {\n");
if (vertical_)
PrintString("rankdir = BT;\n");
else
PrintString("rankdir = LR;\n");
PrintString("size = \"");
Print(width_);
PrintString(",");
Print(height_);
PrintString("\";\n");
if (!dest_.empty())
PrintString("label = \"" + title_ + "\";\n");
PrintString("center = 1;\n");
if (portrait_)
PrintString("orientation = Portrait;\n");
else
PrintString("orientation = Landscape;\n");
PrintString("ranksep = \"");
Print(ranksep_);
PrintString("\";\n");
PrintString("nodesep = \"");
Print(nodesep_);
PrintString("\";\n");
// initial state first
DrawState(start);
for (StateIterator< Fst<A> > siter(fst_);
!siter.Done();
siter.Next()) {
StateId s = siter.Value();
if (s != start)
DrawState(s);
}
PrintString("}\n");
}
private:
// Maximum line length in text file.
static const int kLineLen = 8096;
void PrintString(const string &s) const {
*ostrm_ << s;
}
// Escapes backslash and double quote if these occur in the string. Dot will
// not deal gracefully with these if they are not escaped.
inline void EscapeChars(const string &s, string* ns) const {
const char* c = s.c_str();
while (*c) {
if (*c == '\\' || *c == '"') ns->push_back('\\');
ns->push_back(*c);
++c;
}
}
void PrintId(int64 id, const SymbolTable *syms,
const char *name) const {
if (syms) {
string symbol = syms->Find(id);
if (symbol == "") {
FSTERROR() << "FstDrawer: Integer " << id
<< " is not mapped to any textual symbol"
<< ", symbol table = " << syms->Name()
<< ", destination = " << dest_;
symbol = "?";
}
string nsymbol;
EscapeChars(symbol, &nsymbol);
PrintString(nsymbol);
} else {
string idstr;
Int64ToStr(id, &idstr);
PrintString(idstr);
}
}
void PrintStateId(StateId s) const {
PrintId(s, ssyms_, "state ID");
}
void PrintILabel(Label l) const {
PrintId(l, isyms_, "arc input label");
}
void PrintOLabel(Label l) const {
PrintId(l, osyms_, "arc output label");
}
template <class T>
void Print(T t) const {
*ostrm_ << t;
}
void DrawState(StateId s) const {
Print(s);
PrintString(" [label = \"");
PrintStateId(s);
Weight final = fst_.Final(s);
if (final != Weight::Zero()) {
if (show_weight_one_ || (final != Weight::One())) {
PrintString("/");
Print(final);
}
PrintString("\", shape = doublecircle,");
} else {
PrintString("\", shape = circle,");
}
if (s == fst_.Start())
PrintString(" style = bold,");
else
PrintString(" style = solid,");
PrintString(" fontsize = ");
Print(fontsize_);
PrintString("]\n");
for (ArcIterator< Fst<A> > aiter(fst_, s);
!aiter.Done();
aiter.Next()) {
Arc arc = aiter.Value();
PrintString("\t");
Print(s);
PrintString(" -> ");
Print(arc.nextstate);
PrintString(" [label = \"");
PrintILabel(arc.ilabel);
if (!accep_) {
PrintString(":");
PrintOLabel(arc.olabel);
}
if (show_weight_one_ || (arc.weight != Weight::One())) {
PrintString("/");
Print(arc.weight);
}
PrintString("\", fontsize = ");
Print(fontsize_);
PrintString("];\n");
}
}
const Fst<A> &fst_;
const SymbolTable *isyms_; // ilabel symbol table
const SymbolTable *osyms_; // olabel symbol table
const SymbolTable *ssyms_; // slabel symbol table
bool accep_; // print as acceptor when possible
ostream *ostrm_; // drawn FST destination
string dest_; // drawn FST destination name
string title_;
float width_;
float height_;
bool portrait_;
bool vertical_;
float ranksep_;
float nodesep_;
int fontsize_;
int precision_;
bool show_weight_one_;
DISALLOW_COPY_AND_ASSIGN(FstDrawer);
};
} // namespace fst
#endif // FST_SCRIPT_DRAW_IMPL_H_
|