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
use base64;
use std::io::Read;
use std::str::FromStr;
use xml_rs::reader::{EventReader as XmlEventReader, ParserConfig, XmlEvent};
use {Date, Error, Result, PlistEvent};
pub struct EventReader<R: Read> {
xml_reader: XmlEventReader<R>,
queued_event: Option<XmlEvent>,
element_stack: Vec<String>,
finished: bool,
}
impl<R: Read> EventReader<R> {
pub fn new(reader: R) -> EventReader<R> {
let config = ParserConfig::new()
.trim_whitespace(false)
.whitespace_to_characters(true)
.cdata_to_characters(true)
.ignore_comments(true)
.coalesce_characters(true);
EventReader {
xml_reader: XmlEventReader::new_with_config(reader, config),
queued_event: None,
element_stack: Vec::new(),
finished: false,
}
}
fn read_content<F>(&mut self, f: F) -> Result<PlistEvent>
where F: FnOnce(String) -> Result<PlistEvent>
{
match self.xml_reader.next() {
Ok(XmlEvent::Characters(s)) => f(s),
Ok(event @ XmlEvent::EndElement { .. }) => {
self.queued_event = Some(event);
f("".to_owned())
}
_ => Err(Error::InvalidData),
}
}
fn next_event(&mut self) -> ::std::result::Result<XmlEvent, ()> {
if let Some(event) = self.queued_event.take() {
Ok(event)
} else {
self.xml_reader.next().map_err(|_| ())
}
}
fn read_next(&mut self) -> Option<Result<PlistEvent>> {
loop {
match self.next_event() {
Ok(XmlEvent::StartElement { name, .. }) => {
self.element_stack.push(name.local_name.clone());
match &name.local_name[..] {
"plist" => (),
"array" => return Some(Ok(PlistEvent::StartArray(None))),
"dict" => return Some(Ok(PlistEvent::StartDictionary(None))),
"key" => return Some(self.read_content(|s| Ok(PlistEvent::StringValue(s)))),
"true" => return Some(Ok(PlistEvent::BooleanValue(true))),
"false" => return Some(Ok(PlistEvent::BooleanValue(false))),
"data" => {
return Some(self.read_content(|s| {
let data = base64::decode_config(&s, base64::MIME).map_err(|_| Error::InvalidData)?;
Ok(PlistEvent::DataValue(data))
}))
}
"date" => {
return Some(self.read_content(|s| {
Ok(PlistEvent::DateValue(Date::from_str(&s).map_err(|_| Error::InvalidData)?))
}))
}
"integer" => {
return Some(self.read_content(|s| match FromStr::from_str(&s) {
Ok(i) => Ok(PlistEvent::IntegerValue(i)),
Err(_) => Err(Error::InvalidData),
}))
}
"real" => {
return Some(self.read_content(|s| match FromStr::from_str(&s) {
Ok(f) => Ok(PlistEvent::RealValue(f)),
Err(_) => Err(Error::InvalidData),
}))
}
"string" => {
return Some(self.read_content(|s| Ok(PlistEvent::StringValue(s))))
}
_ => return Some(Err(Error::InvalidData)),
}
}
Ok(XmlEvent::EndElement { name, .. }) => {
match self.element_stack.pop() {
Some(ref open_name) if &name.local_name == open_name => (),
Some(ref _open_name) => return Some(Err(Error::InvalidData)),
None => return Some(Err(Error::InvalidData)),
}
match &name.local_name[..] {
"array" => return Some(Ok(PlistEvent::EndArray)),
"dict" => return Some(Ok(PlistEvent::EndDictionary)),
"plist" => (),
_ => (),
}
}
Ok(XmlEvent::EndDocument) => {
if self.element_stack.is_empty() {
return None;
} else {
return Some(Err(Error::UnexpectedEof));
}
}
Err(_) => return Some(Err(Error::InvalidData)),
_ => (),
}
}
}
}
impl<R: Read> Iterator for EventReader<R> {
type Item = Result<PlistEvent>;
fn next(&mut self) -> Option<Result<PlistEvent>> {
if self.finished {
None
} else {
match self.read_next() {
Some(Ok(event)) => Some(Ok(event)),
Some(Err(err)) => {
self.finished = true;
Some(Err(err))
}
None => {
self.finished = true;
None
}
}
}
}
}
#[cfg(test)]
mod tests {
use chrono::{TimeZone, Utc};
use std::fs::File;
use std::path::Path;
use super::*;
use PlistEvent;
#[test]
fn streaming_parser() {
use PlistEvent::*;
let reader = File::open(&Path::new("./tests/data/xml.plist")).unwrap();
let streaming_parser = EventReader::new(reader);
let events: Vec<PlistEvent> = streaming_parser.map(|e| e.unwrap()).collect();
let comparison = &[StartDictionary(None),
StringValue("Author".to_owned()),
StringValue("William Shakespeare".to_owned()),
StringValue("Lines".to_owned()),
StartArray(None),
StringValue("It is a tale told by an idiot,".to_owned()),
StringValue("Full of sound and fury, signifying nothing.".to_owned()),
EndArray,
StringValue("Death".to_owned()),
IntegerValue(1564),
StringValue("Height".to_owned()),
RealValue(1.60),
StringValue("Data".to_owned()),
DataValue(vec![0, 0, 0, 190, 0, 0, 0, 3, 0, 0, 0, 30, 0, 0, 0]),
StringValue("Birthdate".to_owned()),
DateValue(Utc.ymd(1981, 05, 16).and_hms(11, 32, 06).into()),
StringValue("Blank".to_owned()),
StringValue("".to_owned()),
EndDictionary];
assert_eq!(events, comparison);
}
#[test]
fn bad_data() {
let reader = File::open(&Path::new("./tests/data/xml_error.plist")).unwrap();
let streaming_parser = EventReader::new(reader);
let events: Vec<_> = streaming_parser.collect();
assert!(events.last().unwrap().is_err());
}
}