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
|
#include "grammar.hh"
namespace G {
NT::NT(string& s)
{
s.erase(0, 1);
s.pop_back();
stringstream ss(s);
string buf;
size_t c = 0;
index = 0;
while (ss.good() && getline(ss, buf, ',')) {
if (c == 0) {
symbol = buf;
} else {
index = stoi(buf);
}
c++;
}
}
T::T(string& s)
{
word = s;
}
Item::Item(string& s)
{
if (s.front() == '[' && s.back() == ']') {
type = NON_TERMINAL;
nt = new NT(s);
} else {
type = TERMINAL;
t = new T(s);
}
}
Rule::Rule(string& s)
{
stringstream ss(s);
size_t c = 0;
string buf;
while (ss >> buf) {
if (buf == "|||") { c++; continue; }
if (c == 0) { // LHS
lhs = new NT(buf);
} else if (c == 1) { // RHS
rhs.push_back(new Item(buf));
if (rhs.back()->type == NON_TERMINAL) arity++;
} else if (c == 2) { // TARGET
target.push_back(new Item(buf));
} else if (c == 3) { // F TODO
} else if (c == 4) { // A TODO
} else { // ERROR FIXME
}
if (c == 4) break;
}
arity = 0;
}
Grammar::Grammar(string fn)
{
ifstream ifs(fn);
string line;
while (getline(ifs, line)) {
G::Rule* r = new G::Rule(line);
rules.push_back(r);
if (r->arity == 0)
flat.push_back(r);
else if (r->rhs.front()->type == NON_TERMINAL)
start_nt.push_back(r);
else
start_t.push_back(r);
}
}
string
Item::repr() const
{
ostringstream os;
if (type == TERMINAL)
os << t->repr();
else
os << nt->repr();
return os.str();
}
ostream&
operator<<(ostream& os, const Item& i)
{
return os << i.repr();
}
string
NT::repr() const
{
ostringstream os;
os << "NT<" << symbol << "," << index << ">";
return os.str();
}
ostream&
operator<<(ostream& os, const NT& nt)
{
return os << nt.repr();
}
string
T::repr() const
{
ostringstream os;
os << "T<" << word << ">";
return os.str();
}
ostream&
operator<<(ostream& os, const T& t)
{
return os << t.repr();
}
string
Rule::repr() const
{
ostringstream os;
os << "Rule<lhs=" << lhs->repr() << \
", rhs:{";
for (auto it = rhs.begin(); it != rhs.end(); it++) {
os << (**it).repr();
if (next(it) != rhs.end()) os << " ";
}
os << "}, target:{";
for (auto it = target.begin(); it != target.end(); it++) {
os << (**it).repr();
if (next(it) != target.end()) os << " ";
}
os << "}" \
", f:" << "TODO" << \
", arity=" << arity << \
", map:" << "TODO" << \
">";
return os.str();
}
ostream&
operator<<(ostream& os, const Rule& r)
{
return os << r.repr();
}
ostream&
operator<<(ostream& os, const Grammar& g)
{
for (auto it = g.rules.begin(); it != g.rules.end(); it++)
os << (**it).repr() << endl;
return os;
}
} // namespace G
|
