pub trait UpdateFields {
// Required method
fn update_field(
&mut self,
tag: &Tag,
doc: &Document,
) -> Result<(), Box<dyn Error>>;
// Provided methods
fn update_fields(&mut self, doc: &Document) -> Result<(), Box<dyn Error>>
where Self: Debug { ... }
fn update_attribute_fields(
&mut self,
_tag: &Tag,
) -> Result<(), Box<dyn Error>> { ... }
}Required Methods§
Provided Methods§
Sourcefn update_fields(&mut self, doc: &Document) -> Result<(), Box<dyn Error>>where
Self: Debug,
fn update_fields(&mut self, doc: &Document) -> Result<(), Box<dyn Error>>where
Self: Debug,
Examples found in repository?
examples/extract_information_derived.rs (line 52)
37fn main() -> Result<(), Box<dyn std::error::Error>> {
38 let mut file = File::open("examples/TheExpanseSeries.xml")?;
39 let data = read_file(&mut file)?;
40 let (_, doc) = Document::parse_element_by_tag_name(&data, "book", &None)?;
41 let mut book = Book::default();
42 // doc.iter_with_depth(0)
43 // .filter_map(|record| {
44 // if let Document::Element(tag, inner_doc, _) = record {
45 // Some((tag, inner_doc))
46 // } else {
47 // None
48 // }
49 // })
50 // .try_for_each(|(tag, inner_doc)| book.update_field(tag, inner_doc))?;
51 // book.update_attribute_fields(&doc);
52 book.update_fields(&doc)?;
53 println!("{book:#?}");
54 Ok(())
55}More examples
examples/extract_information_manual.rs (line 67)
21 fn update_field(
22 &mut self,
23 tag: &Tag,
24 doc: &Document,
25 ) -> Result<(), Box<dyn std::error::Error>> {
26 let field_name = &tag.name.local_part;
27
28 if let Some(attributes_vec) = &tag.attributes {
29 for attr in attributes_vec.iter() {
30 if let Attribute::Instance {
31 name,
32 value: AttributeValue::Value(attr_val),
33 } = attr
34 {
35 if name.local_part == "isbn" {
36 self.isbn = attr_val.to_string();
37 }
38 }
39 }
40 }
41
42 match &doc {
43 Document::Content(Some(value)) => match field_name.as_str() {
44 "title" => {
45 self.title = value.to_string();
46 }
47 "genre" => {
48 self.genre = value.to_string();
49 }
50 "type" => {
51 self.ty = value.to_string();
52 }
53 "series_number" => {
54 self.series_number = value.parse().unwrap_or_default();
55 }
56 "description" => {
57 self.description = value.to_string();
58 }
59 e => {
60 return Err(format!("Unknown field2: {}", e).into());
61 }
62 },
63 Document::Nested(_) => {
64 for element in doc.iter_with_depth(1) {
65 if let Document::Element(tag, inner_doc, _) = element {
66 if "authored_by" == tag.name.local_part {
67 self.authored_by.update_fields(inner_doc)?;
68 } else {
69 self.update_field(tag, inner_doc)?;
70 }
71 } else {
72 return Err(format!("Unknown field: {element:#?}").into());
73 }
74 }
75 }
76
77 _ => {
78 return Err("Content is missing".into());
79 }
80 }
81
82 Ok(())
83 }examples/extract_information_manual_catalog.rs (line 104)
56 fn update_field(
57 &mut self,
58 tag: &Tag,
59 doc: &Document,
60 ) -> Result<(), Box<dyn std::error::Error>> {
61 let field_name = &tag.name.local_part;
62
63 if let Some(attributes) = &tag.attributes {
64 for attr in attributes.iter() {
65 if let Attribute::Instance {
66 name,
67 value: AttributeValue::Value(attr_val),
68 } = attr
69 {
70 if name.local_part == "isbn" {
71 self.isbn = Some(attr_val.into());
72 }
73 }
74 }
75 }
76
77 match &doc {
78 Document::Content(Some(value)) => match field_name.as_str() {
79 "title" => {
80 self.title = value.into();
81 }
82 "genre" => {
83 self.genre = value.into();
84 }
85 "type" => {
86 self.ty = value.to_string();
87 }
88 "series_number" => {
89 self.series_number = value.parse().unwrap_or_default();
90 }
91 "description" => {
92 self.description = value.into();
93 }
94 e => {
95 return Err(format!("Unknown field: {}", e).into());
96 }
97 },
98 Document::Nested(_) => {
99 doc.iter_with_depth(1).try_for_each(
100 |element| -> Result<(), Box<dyn std::error::Error>> {
101 if let Document::Element(tag, inner_doc, _) = element {
102 match tag.name.local_part.as_str() {
103 "authored_by" => {
104 self.authored_by.update_fields(inner_doc)?;
105 }
106 _ => {
107 self.update_field(tag, inner_doc)?;
108 }
109 }
110 Ok(())
111 } else {
112 Err(format!("Unknown field: {element:#?}").into())
113 }
114 },
115 )?;
116 }
117 _ => {
118 return Err("Content is missing".into());
119 }
120 }
121 Ok(())
122 }fn update_attribute_fields(&mut self, _tag: &Tag) -> Result<(), Box<dyn Error>>
Dyn Compatibility§
This trait is not dyn compatible.
In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.