-
Notifications
You must be signed in to change notification settings - Fork 0
/
parser.d
266 lines (233 loc) · 7.17 KB
/
parser.d
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
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
import scanner, std.string;
import std.stdio;
import ll, ll_lex, codegen;
string ll_parse(Scanner scanner){
string usercode = parse_parser(scanner);
Production.compute_follow;
Production.construct;
CodeGen cg = new CodeGen(Production.predictive_table, Production.types);
cg.usercode = usercode;
return cg.generate;
}
string ll_parse(std.stream.InputStream stream){
SimpleLexer lex = new SimpleLexer(stream);
Token t = lex.read;
Scanner scanner = new Scanner;
while (t.type != "EOF"){
scanner.write(t);
t = lex.read;
}
scanner.write(t);
return ll_parse(scanner);
}
string[] parse_nonterminal_expr_(Scanner _ll_scanner){
string[] _ll_result;
auto _ll_next = _ll_scanner.next;
if (_ll_next.type == "LL-CODE"){
// Nullable production: do not consume anything
_ll_result = (cast(string[] delegate()){
// nonterminal_expr_ : \0
return [];
})();
} else
if (_ll_next.type == "LL-IDENTIFIER"){
string[] _1 = parse_nonterminal_expr(_ll_scanner);
_ll_result = (cast(string[] delegate()){
// nonterminal_expr_ : nonterminal_expr
return _1;
})();
} else
throw new Exception("Not expecting first of '%s' in production nonterminal_expr_".format(_ll_next.type));
return _ll_result;
}
Nonterminal[] parse_rule_stmt_(Scanner _ll_scanner){
Nonterminal[] _ll_result;
auto _ll_next = _ll_scanner.next;
if (_ll_next.type == "LL-SEMI"){
// Nullable production: do not consume anything
_ll_result = (cast(Nonterminal[] delegate()){
// rule_stmt_ : \0
return [];
})();
} else
if (_ll_next.type == "LL-OR"){
string _1 = _ll_scanner.read("LL-OR").value;
Nonterminal[] _2 = parse_rule_stmt(_ll_scanner);
_ll_result = (cast(Nonterminal[] delegate()){
// rule_stmt_ : | rule
return _2;
})();
} else
throw new Exception("Not expecting first of '%s' in production rule_stmt_".format(_ll_next.type));
return _ll_result;
}
string[] parse_production_list(Scanner _ll_scanner){
string[] _ll_result;
auto _ll_next = _ll_scanner.next;
if (_ll_next.type == "LL-PRODUCTION"){
string[] _1 = parse_production_stmt(_ll_scanner);
string[] _2 = parse_production_list_(_ll_scanner);
_ll_result = (cast(string[] delegate()){
// production_list
return _1 ~ _2;
})();
} else
throw new Exception("Not expecting first of '%s' in production production_list".format(_ll_next.type));
return _ll_result;
}
void parse_rule_list(Scanner _ll_scanner){
auto _ll_next = _ll_scanner.next;
if (_ll_next.type == "LL-IDENTIFIER"){
string _1 = _ll_scanner.read("LL-IDENTIFIER").value;
string _2 = _ll_scanner.read("LL-GETS").value;
Nonterminal[] _3 = parse_rule_stmt(_ll_scanner);
string _4 = _ll_scanner.read("LL-SEMI").value;
parse_rule_list_(_ll_scanner);
({
// rule_list
Production.rules[_1] = _3;
})();
} else
throw new Exception("Not expecting first of '%s' in production rule_list".format(_ll_next.type));
}
string[] parse_production_stmt(Scanner _ll_scanner){
string[] _ll_result;
auto _ll_next = _ll_scanner.next;
if (_ll_next.type == "LL-PRODUCTION"){
string _1 = _ll_scanner.read("LL-PRODUCTION").value;
string _2 = _ll_scanner.read("LL-IDENTIFIER").value;
string _3 = _ll_scanner.read("LL-IDENTIFIER").value;
_ll_result = (cast(string[] delegate()){
// production_stmt
return [_2, _3];
})();
} else
throw new Exception("Not expecting first of '%s' in production production_stmt".format(_ll_next.type));
return _ll_result;
}
void parse_rule_list_(Scanner _ll_scanner){
auto _ll_next = _ll_scanner.next;
if (_ll_next.type == "EOF"){
// Nullable production: do not consume anything
({
// rule_list_ : \0
})();
} else
if (_ll_next.type == "LL-IDENTIFIER"){
parse_rule_list(_ll_scanner);
({
// rule_list_ : rule
})();
} else
throw new Exception("Not expecting first of '%s' in production rule_list_".format(_ll_next.type));
}
string[] parse_nonterminal_expr(Scanner _ll_scanner){
string[] _ll_result;
auto _ll_next = _ll_scanner.next;
if (_ll_next.type == "LL-IDENTIFIER"){
string _1 = _ll_scanner.read("LL-IDENTIFIER").value;
string[] _2 = parse_nonterminal_expr_(_ll_scanner);
_ll_result = (cast(string[] delegate()){
// nonterminal_expr : 1*
return [_1] ~ _2;
})();
} else
throw new Exception("Not expecting first of '%s' in production nonterminal_expr".format(_ll_next.type));
return _ll_result;
}
Nonterminal[] parse_rule_stmt(Scanner _ll_scanner){
Nonterminal[] _ll_result;
auto _ll_next = _ll_scanner.next;
if (_ll_next.type == "LL-CODE"){
string _1 = _ll_scanner.read("LL-CODE").value;
Nonterminal[] _2 = parse_rule_stmt_(_ll_scanner);
_ll_result = (cast(Nonterminal[] delegate()){
// rule_stmt : code
Nonterminal n = new Nonterminal(_1);
n.cat = ["\0"];
return [n] ~ _2;
})();
} else
if (_ll_next.type == "LL-IDENTIFIER"){
string[] _1 = parse_nonterminal_expr(_ll_scanner);
string _2 = _ll_scanner.read("LL-CODE").value;
Nonterminal[] _3 = parse_rule_stmt_(_ll_scanner);
_ll_result = (cast(Nonterminal[] delegate()){
// rule_stmt : nonterminal_expr code
Nonterminal n = new Nonterminal(_2);
n.cat = _1;
return [n] ~ _3;
})();
} else
throw new Exception("Not expecting first of '%s' in production rule_stmt".format(_ll_next.type));
return _ll_result;
}
string[] parse_production_list_(Scanner _ll_scanner){
string[] _ll_result;
auto _ll_next = _ll_scanner.next;
if (_ll_next.type == "LL-IDENTIFIER"){
// Nullable production: do not consume anything
_ll_result = (cast(string[] delegate()){
// production_list_ : \0
return [];
})();
} else
if (_ll_next.type == "LL-PRODUCTION"){
string[] _1 = parse_production_list(_ll_scanner);
_ll_result = (cast(string[] delegate()){
// production_list_ : production
return _1;
})();
} else
throw new Exception("Not expecting first of '%s' in production production_list_".format(_ll_next.type));
return _ll_result;
}
void parse_grammar(Scanner _ll_scanner){
auto _ll_next = _ll_scanner.next;
if (_ll_next.type == "LL-PRODUCTION"){
string[] _1 = parse_production_list(_ll_scanner);
parse_rule_list(_ll_scanner);
({
// grammar : +productions
Production.add_rules(_1);
})();
} else
if (_ll_next.type == "LL-IDENTIFIER"){
parse_rule_list(_ll_scanner);
({
// grammar : rule_list
})();
} else
throw new Exception("Not expecting first of '%s' in production grammar".format(_ll_next.type));
}
string parse_parser(Scanner _ll_scanner){
string _ll_result;
auto _ll_next = _ll_scanner.next;
if (_ll_next.type == "LL-CODE"){
string _1 = _ll_scanner.read("LL-CODE").value;
parse_grammar(_ll_scanner);
string _3 = _ll_scanner.read("EOF").value;
_ll_result = (cast(string delegate()){
// parser : +usercode
return _1;
})();
} else
if (_ll_next.type == "LL-PRODUCTION"){
parse_grammar(_ll_scanner);
string _2 = _ll_scanner.read("EOF").value;
_ll_result = (cast(string delegate()){
// parser : grammar
return "";
})();
} else
if (_ll_next.type == "LL-IDENTIFIER"){
parse_grammar(_ll_scanner);
string _2 = _ll_scanner.read("EOF").value;
_ll_result = (cast(string delegate()){
// parser : grammar
return "";
})();
} else
throw new Exception("Not expecting first of '%s' in production parser".format(_ll_next.type));
return _ll_result;
}