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
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
#![deny(missing_docs)]
#[macro_use]
extern crate nom;
#[macro_use]
extern crate log;
extern crate petgraph;
extern crate mowl;
#[macro_use]
pub mod error;
pub mod parser;
pub mod example;
use std::fmt;
use std::fs::File;
use std::io::prelude::*;
use std::collections::HashMap;
use log::LogLevel;
use nom::{IResult, generate_colors, prepare_errors, print_codes, print_offsets};
use petgraph::{Graph, Direction};
use petgraph::dot::{Dot, Config};
use petgraph::graph::NodeIndex;
use petgraph::stable_graph::StableGraph;
use petgraph::visit::{EdgeRef, IntoEdgeReferences};
use prelude::*;
use parser::ParserBox;
pub mod prelude {
pub use super::Peel;
pub use error::{PeelResult, PeelError, ErrorType};
pub use parser::Parser;
}
pub struct Peel<R, V, D> {
pub graph: StableGraph<ParserBox<R, V, D>, ()>,
pub root: Option<NodeIndex>,
pub data: Option<D>,
}
impl<R, V, D> Peel<R, V, D>
where V: fmt::Display
{
pub fn new() -> Self {
Peel {
graph: StableGraph::new(),
root: None,
data: None,
}
}
pub fn set_log_level(&mut self, level: LogLevel) {
if mowl::init_with_level(level).is_err() {
warn!("Logger already set.");
};
info!("Log level set to: {:?}", level);
}
pub fn new_parser<T>(&mut self, parser: T) -> NodeIndex
where T: Parser<D, Result = R, Variant = V> + Send + Sync + 'static
{
let new_node = self.graph.add_node(Box::new(parser));
if self.root.is_none() {
self.root = Some(new_node);
}
new_node
}
pub fn link(&mut self, left: NodeIndex, right: NodeIndex) {
self.graph.add_edge(left, right, ());
}
pub fn link_new_parser<T>(&mut self, left: NodeIndex, parser: T) -> NodeIndex
where T: Parser<D, Result = R, Variant = V> + Send + Sync + 'static
{
let new_parser = self.new_parser(parser);
self.graph.add_edge(left, new_parser, ());
new_parser
}
pub fn traverse(&mut self, input: &[u8], result: Vec<R>) -> PeelResult<Vec<R>> {
match self.root {
Some(node) => self.traverse_recursive(node, input, result),
None => bail!(ErrorType::NoTreeRoot, "No tree root found"),
}
}
pub fn traverse_recursive(&mut self, node_id: NodeIndex, input: &[u8], mut result: Vec<R>) -> PeelResult<Vec<R>> {
let (left_input, error) = {
let parser = &mut self.graph[node_id];
match parser.parse(input,
Some(&result),
if let Some(ref mut data) = self.data {
Some(data)
} else {
None
}) {
IResult::Done(left_input, parser_result) => {
debug!("{} parsing succeed, left input length: {}",
parser.variant(),
left_input.len());
result.push(parser_result);
(left_input, None)
}
error => {
trace!("Failed parser: {}", parser.variant());
if Some(node_id) == self.root {
bail!(ErrorType::RootParserFailed, "No parser succeed at all");
}
(input, Some(error))
}
}
};
match error {
Some(error) => {
if log_enabled!(log::LogLevel::Trace) {
self.display_error(input, error);
}
}
_ => {
let mut edges = self.graph.neighbors_directed(node_id, Direction::Outgoing).detach();
while let Some(node) = edges.next_node(&self.graph) {
let prev_len = result.len();
result = self.traverse_recursive(node, left_input, result)?;
if prev_len < result.len() {
break;
}
}
}
}
Ok(result)
}
pub fn create_dot_file(&mut self) -> PeelResult<()> {
let mut graph = Graph::<_, ()>::new();
for node_id in self.graph.node_indices() {
let parser = &self.graph[node_id];
graph.add_node(format!("{}", parser.variant()));
}
for edge in self.graph.edge_references() {
graph.add_edge(edge.source(), edge.target(), ());
}
let mut f = File::create("graph.dot")?;
f.write_all(format!("{:?}", Dot::with_config(&graph, &[Config::EdgeNoLabel])).as_bytes())?;
Ok(())
}
pub fn display_error(&self, input: &[u8], res: IResult<&[u8], R>) {
let mut h: HashMap<u32, &str> = HashMap::new();
let parsers = ["Custom",
"Tag",
"MapRes",
"MapOpt",
"Alt",
"IsNot",
"IsA",
"SeparatedList",
"SeparatedNonEmptyList",
"Many1",
"Count",
"TakeUntilAndConsume",
"TakeUntil",
"TakeUntilEitherAndConsume",
"TakeUntilEither",
"LengthValue",
"TagClosure",
"Alpha",
"Digit",
"AlphaNumeric",
"Space",
"MultiSpace",
"LengthValueFn",
"Eof",
"ExprOpt",
"ExprRes",
"CondReduce",
"Switch",
"TagBits",
"OneOf",
"NoneOf",
"Char",
"CrLf",
"RegexpMatch",
"RegexpMatches",
"RegexpFind",
"RegexpCapture",
"RegexpCaptures",
"TakeWhile1",
"Complete",
"Fix",
"Escaped",
"EscapedTransform",
"TagStr",
"IsNotStr",
"IsAStr",
"TakeWhile1Str",
"NonEmpty",
"ManyMN",
"TakeUntilAndConsumeStr",
"HexDigit",
"TakeUntilStr",
"OctDigit",
"Many0",
"Not",
"Permutation",
"ManyTill"];
for (i, literal) in parsers.iter().enumerate() {
h.insert(i as u32, literal);
}
if let Some(v) = prepare_errors(input, res) {
let colors = generate_colors(&v);
println!("Colors: {}", print_codes(colors, h));
println!("Dump: \n{}", print_offsets(input, 0, &v));
}
}
}