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extract_information_manual.rs
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extract_information_manual.rs
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use std::fs::File;
use nom_xml::{
attribute::{Attribute, AttributeValue},
io::read_file,
tag::Tag,
Document, UpdateFields,
};
#[derive(Debug, Default)]
struct Book {
isbn: String,
authored_by: AuthoredBy,
title: String,
genre: String,
ty: String,
series_number: u8,
description: String,
}
impl UpdateFields for Book {
fn update_field(
&mut self,
tag: &Tag,
doc: &Document,
) -> Result<(), Box<dyn std::error::Error>> {
let field_name = &tag.name.local_part;
if let Some(attributes_vec) = &tag.attributes {
for attr in attributes_vec.iter() {
if let Attribute::Instance {
name,
value: AttributeValue::Value(attr_val),
} = attr
{
if name.local_part == "isbn" {
self.isbn = attr_val.to_string();
}
}
}
}
match &doc {
Document::Content(Some(value)) => match field_name.as_str() {
"title" => {
self.title = value.to_string();
}
"genre" => {
self.genre = value.to_string();
}
"type" => {
self.ty = value.to_string();
}
"series_number" => {
self.series_number = value.parse().unwrap_or_default();
}
"description" => {
self.description = value.to_string();
}
e => {
return Err(format!("Unknown field2: {}", e).into());
}
},
Document::Nested(_) => {
for element in doc.iter_with_depth(1) {
if let Document::Element(tag, inner_doc, _) = element {
if "authored_by" == tag.name.local_part {
self.authored_by.update_fields(inner_doc)?;
} else {
self.update_field(tag, inner_doc)?;
}
} else {
return Err(format!("Unknown field: {element:#?}").into());
}
}
}
_ => {
return Err("Content is missing".into());
}
}
Ok(())
}
}
#[derive(Debug, Default, Clone)]
struct AuthoredBy {
pen_name: String,
authors: Vec<AuthorName>,
}
impl UpdateFields for AuthoredBy {
fn update_field(
&mut self,
tag: &Tag,
doc: &Document,
) -> Result<(), Box<dyn std::error::Error>> {
match (tag.name.local_part.as_str(), doc) {
("pen_name", Document::Content(Some(value))) => {
self.pen_name = value.to_string();
Ok(())
}
("authors", Document::Nested(elements)) => {
elements.iter().try_for_each(
|element| -> std::result::Result<(), Box<dyn std::error::Error>> {
if let Document::Element(_, inner_doc, _) = element {
let mut author_name = AuthorName::default();
if let Document::Nested(inner_elements) = inner_doc.as_ref() {
inner_elements.iter().try_for_each(
|inner_element| -> Result<(), Box<dyn std::error::Error>> {
if let Document::Element(tag, content, _) = inner_element {
author_name.update_field(tag, content)?;
}
Ok(())
},
)?;
self.authors.push(author_name);
} else {
return Err("Content is missing in Author authors".into());
}
}
Ok(())
},
)?;
Ok(())
}
_ => Err(format!("Unknown field in Author: {}", tag.name.local_part).into()),
}
}
}
#[derive(Debug, Default, Clone)]
struct AuthorName {
first_name: String,
last_name: String,
}
impl UpdateFields for AuthorName {
fn update_field(
&mut self,
tag: &Tag,
doc: &Document,
) -> Result<(), Box<dyn std::error::Error>> {
let field_name = &tag.name.local_part;
if let Document::Content(Some(value)) = &doc {
match field_name.as_str() {
"first_name" => {
self.first_name = value.to_string();
Ok(())
}
"last_name" => {
self.last_name = value.to_string();
Ok(())
}
e => Err(format!("Unknown field in AuthorName: {}", e).into()),
}
} else {
Err("Content is missing in AuthorName".into())
}
}
}
fn main() -> Result<(), Box<dyn std::error::Error>> {
let mut file = File::open("examples/TheExpanseSeries.xml")?;
let data = read_file(&mut file)?;
let (_, doc) = Document::parse_element_by_tag_name(&data, "book", &None)?;
let mut book = Book::default();
doc.iter_with_depth(0)
.filter_map(|element| {
if let Document::Element(tag, inner_doc, _) = element {
Some((tag, inner_doc))
} else {
None
}
})
.try_for_each(|(tag, inner_doc)| book.update_field(tag, inner_doc))?;
println!("{book:#?}");
Ok(())
}