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
use percent_encoding::{utf8_percent_encode, NON_ALPHANUMERIC};
// -----------------------------------------------------------------------------
impl crate::traits::QueryString for crate::places::query_autocomplete::Request<'_> {
/// Builds the URL [query string](https://en.wikipedia.org/wiki/Query_string)
/// for the HTTP [GET](https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/GET)
/// request. The query string is generated from the data found in this
/// `Request` structure.
///
/// ## Arguments
///
/// This method accepts no arguments.
///
/// ## Notes
///
/// * This function does not validate the request before generating the
/// _query string_. However, the superior method that generates the _query
/// URL_ does perform validation.
///
/// * The query string is the part of the URL after the `?` question mark.
/// For example, in the URL `https://example.com/over/there?name=ferret`
/// the query string is `name=ferret`
///
/// * There's no benefit to working on an owned `Request` struct (i.e. an
/// owned `self` versus an borrowed `&self`).
/// [percent-encoding](https://crates.io/crates/percent-encoding)
/// works on borrowed UTF-8 strings. Other types, such as enums and
/// numeric values are converted into strings. Therefore no zero-copy
/// operations are possible with an owned `self`.
fn query_string(&self) -> String {
// This section builds the "required parameters" portion of the query
// string:
let mut query = format!(
"key={}&input={}",
self.client.key,
utf8_percent_encode(&self.input, NON_ALPHANUMERIC),
);
// This section builds the "optional parameters" portion of the query
// string:
// Language key/value pair:
if let Some(language) = &self.language {
query.push_str("&language=");
query.push_str(&String::from(language));
}
// Location key/value pair:
if let Some(location) = &self.location {
query.push_str("&location=");
query.push_str(&String::from(location));
}
// Offset key/value pair:
if let Some(offset) = &self.offset {
query.push_str("&offset=");
query.push_str(&offset.to_string());
}
// Radius key/value pair:
if let Some(radius) = &self.radius {
query.push_str("&radius=");
query.push_str(&radius.to_string());
}
// Return built query string to caller:
query
} // fn
} // impl