nom_xml

Enum Document

Source 
pub enum Document {
    Prolog {
        xml_decl: Option<XmlDecl>,
        misc: Option<Vec<Misc>>,
        doc_type: Option<DocType>,
    },
    Element(Tag, Box<Document>, Tag),
    Content(Option<String>),
    Nested(Vec<Document>),
    Empty,
    EmptyTag(Tag),
    ProcessingInstruction(ProcessingInstruction),
    Comment(String),
    CDATA(String),
}
Expand description

Main entry point for parsing XML documents

This enum encapsulates all of the top level types that comprise an XML document. The core variant is the Element(Tag,Box<Document>,Tag) type which allows recursive parsing of nested tags and their content.

Variants§

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Prolog

Fields

§xml_decl: Option<XmlDecl>
§misc: Option<Vec<Misc>>
§doc_type: Option<DocType>
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Element(Tag, Box<Document>, Tag)

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Content(Option<String>)

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Nested(Vec<Document>)

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Empty

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EmptyTag(Tag)

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ProcessingInstruction(ProcessingInstruction)

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Comment(String)

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CDATA(String)

Implementations§

Source§

impl Document

Source

pub fn parse_prolog<'a>( input: &'a str, entity_references: Rc<RefCell<HashMap<(Name, EntitySource), EntityValue>>>, config: &'a Config, ) -> IResult<&'a str, (Option<Document>, Rc<RefCell<HashMap<(Name, EntitySource), EntityValue>>>)>

Source

pub fn parse_element_by_tag_name<'a>( input: &'a str, tag_name: &'a str, attributes: &Option<Vec<Attribute>>, ) -> IResult<&'a str, Document>

The main interface for parsing the first element that matches criteria

See the parse_first_matching_element example for more information

Run with cargo run --example parse_first_matching_element

Also see the parse_element_with_specific_attribute_value example

Run with cargo run --example parse_element_with_specific_attribute_value

Examples found in repository?
examples/parse_first_matching_element.rs (line 10)
7fn main() -> Result<(), Box<dyn std::error::Error>> {
8    let mut file = File::open("examples/TheExpanseSeries.xml")?;
9    let data = read_file(&mut file)?;
10    let (_, doc) = Document::parse_element_by_tag_name(&data, "book", &None)?;
11    println!("{doc:?}");
12    Ok(())
13}
More examples
Hide additional examples
examples/parse_element_with_specific_attribute_value.rs (lines 11-15)
8fn main() -> Result<(), Box<dyn std::error::Error>> {
9    let mut file = File::open("examples/TheExpanseSeries.xml")?;
10    let data = read_file(&mut file)?;
11    let (_, doc) = Document::parse_element_by_tag_name(
12        &data,
13        "book",
14        &Some(vec![Attribute::new("isbn", "978-0316332910")]),
15    )?;
16    println!("{doc:?}");
17    Ok(())
18}
examples/extract_information_manual.rs (line 165)
162fn main() -> Result<(), Box<dyn std::error::Error>> {
163    let mut file = File::open("examples/TheExpanseSeries.xml")?;
164    let data = read_file(&mut file)?;
165    let (_, doc) = Document::parse_element_by_tag_name(&data, "book", &None)?;
166    let mut book = Book::default();
167
168    doc.iter_with_depth(0)
169        .filter_map(|element| {
170            if let Document::Element(tag, inner_doc, _) = element {
171                Some((tag, inner_doc))
172            } else {
173                None
174            }
175        })
176        .try_for_each(|(tag, inner_doc)| book.update_field(tag, inner_doc))?;
177
178    println!("{book:#?}");
179    Ok(())
180}
examples/extract_information_derived.rs (line 40)
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}
examples/extract_information_derived_catalog.rs (line 46)
43fn main() -> Result<(), Box<dyn std::error::Error>> {
44    let mut file = File::open("examples/TheExpanseSeries.xml")?;
45    let data = read_file(&mut file)?;
46    let (_, doc) = Document::parse_element_by_tag_name(&data, "catalog", &None)?;
47    let mut books = Books::default();
48
49    doc.iter_with_depth(0)
50        .filter_map(|element| {
51            if let Document::Element(tag, inner_doc, _) = element {
52                Some((tag, inner_doc))
53            } else {
54                None
55            }
56        })
57        .try_for_each(|(tag, inner_doc)| books.update_field(tag, inner_doc))
58        .map_err(|e| {
59            println!("Error updating field: {}", e);
60            e
61        })?;
62
63    println!("{books:#?}");
64    Ok(())
65}
examples/extract_information_manual_catalog.rs (line 205)
202fn main() -> Result<(), Box<dyn std::error::Error>> {
203    let mut file = File::open("examples/TheExpanseSeries.xml")?;
204    let data = read_file(&mut file)?;
205    let (_, doc) = Document::parse_element_by_tag_name(&data, "catalog", &None)?;
206    let mut books = Books::default();
207
208    doc.iter_with_depth(0)
209        .filter_map(|element| {
210            if let Document::Element(tag, inner_doc, _) = element {
211                Some((tag, inner_doc))
212            } else {
213                None
214            }
215        })
216        .try_for_each(|(tag, inner_doc)| books.update_field(tag, inner_doc))
217        .map_err(|e| {
218            println!("Error updating field: {}", e);
219            e
220        })?;
221
222    println!("{books:#?}");
223    Ok(())
224}
Source

pub fn parse_elements_by_tag_name<'a>( input: &'a str, tag_name: &'a str, attributes: &Option<Vec<Attribute>>, ) -> IResult<&'a str, Vec<Document>>

The main interface for parsing many elements with the same tag name

See the parse_all_of_specific_tag example for more information

Run with cargo run --example parse_all_of_specific_tag

Examples found in repository?
examples/parse_all_of_specific_tag.rs (line 12)
8fn main() -> Result<(), Box<dyn std::error::Error>> {
9    let mut file = File::open("examples/TheExpanseSeries.xml")?;
10    let data = read_file(&mut file)?;
11
12    let (_, doc) = Document::parse_elements_by_tag_name(&data, "book", &None)?;
13    println!("{doc:?}");
14    Ok(())
15}
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impl Document

Source

pub fn iter_with_depth(&self, max_level: usize) -> DocumentIterator<'_> ⓘ

The main interface for exracting content from the Document tree See the extract_information_manual example for more information

Examples found in repository?
examples/extract_information_derived_catalog.rs (line 49)
43fn main() -> Result<(), Box<dyn std::error::Error>> {
44    let mut file = File::open("examples/TheExpanseSeries.xml")?;
45    let data = read_file(&mut file)?;
46    let (_, doc) = Document::parse_element_by_tag_name(&data, "catalog", &None)?;
47    let mut books = Books::default();
48
49    doc.iter_with_depth(0)
50        .filter_map(|element| {
51            if let Document::Element(tag, inner_doc, _) = element {
52                Some((tag, inner_doc))
53            } else {
54                None
55            }
56        })
57        .try_for_each(|(tag, inner_doc)| books.update_field(tag, inner_doc))
58        .map_err(|e| {
59            println!("Error updating field: {}", e);
60            e
61        })?;
62
63    println!("{books:#?}");
64    Ok(())
65}
More examples
Hide additional examples
examples/extract_information_manual.rs (line 64)
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    }
84}
85
86#[derive(Debug, Default, Clone)]
87struct AuthoredBy {
88    pen_name: String,
89    authors: Vec<AuthorName>,
90}
91
92impl UpdateFields for AuthoredBy {
93    fn update_field(
94        &mut self,
95        tag: &Tag,
96        doc: &Document,
97    ) -> Result<(), Box<dyn std::error::Error>> {
98        match (tag.name.local_part.as_str(), doc) {
99            ("pen_name", Document::Content(Some(value))) => {
100                self.pen_name = value.to_string();
101                Ok(())
102            }
103            ("authors", Document::Nested(elements)) => {
104                elements.iter().try_for_each(
105                    |element| -> std::result::Result<(), Box<dyn std::error::Error>> {
106                        if let Document::Element(_, inner_doc, _) = element {
107                            let mut author_name = AuthorName::default();
108                            if let Document::Nested(inner_elements) = inner_doc.as_ref() {
109                                inner_elements.iter().try_for_each(
110                                    |inner_element| -> Result<(), Box<dyn std::error::Error>> {
111                                        if let Document::Element(tag, content, _) = inner_element {
112                                            author_name.update_field(tag, content)?;
113                                        }
114                                        Ok(())
115                                    },
116                                )?;
117                                self.authors.push(author_name);
118                            } else {
119                                return Err("Content is missing in Author authors".into());
120                            }
121                        }
122                        Ok(())
123                    },
124                )?;
125                Ok(())
126            }
127            _ => Err(format!("Unknown field in Author: {}", tag.name.local_part).into()),
128        }
129    }
130}
131
132#[derive(Debug, Default, Clone)]
133struct AuthorName {
134    first_name: String,
135    last_name: String,
136}
137impl UpdateFields for AuthorName {
138    fn update_field(
139        &mut self,
140        tag: &Tag,
141        doc: &Document,
142    ) -> Result<(), Box<dyn std::error::Error>> {
143        let field_name = &tag.name.local_part;
144
145        if let Document::Content(Some(value)) = &doc {
146            match field_name.as_str() {
147                "first_name" => {
148                    self.first_name = value.to_string();
149                    Ok(())
150                }
151                "last_name" => {
152                    self.last_name = value.to_string();
153                    Ok(())
154                }
155                e => Err(format!("Unknown field in AuthorName: {}", e).into()),
156            }
157        } else {
158            Err("Content is missing in AuthorName".into())
159        }
160    }
161}
162fn main() -> Result<(), Box<dyn std::error::Error>> {
163    let mut file = File::open("examples/TheExpanseSeries.xml")?;
164    let data = read_file(&mut file)?;
165    let (_, doc) = Document::parse_element_by_tag_name(&data, "book", &None)?;
166    let mut book = Book::default();
167
168    doc.iter_with_depth(0)
169        .filter_map(|element| {
170            if let Document::Element(tag, inner_doc, _) = element {
171                Some((tag, inner_doc))
172            } else {
173                None
174            }
175        })
176        .try_for_each(|(tag, inner_doc)| book.update_field(tag, inner_doc))?;
177
178    println!("{book:#?}");
179    Ok(())
180}
examples/extract_information_manual_catalog.rs (line 99)
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    }
123}
124
125#[derive(Debug, Default, Clone)]
126struct AuthoredBy {
127    pen_name: String,
128    authors: Vec<AuthorName>,
129}
130
131impl UpdateFields for AuthoredBy {
132    fn update_field(
133        &mut self,
134        tag: &Tag,
135        doc: &Document,
136    ) -> Result<(), Box<dyn std::error::Error>> {
137        match (tag.name.local_part.as_str(), doc) {
138            ("pen_name", Document::Content(Some(value))) => {
139                self.pen_name = value.to_string();
140                Ok(())
141            }
142            ("authors", Document::Nested(elements)) => {
143                elements.iter().try_for_each(
144                    |element| -> std::result::Result<(), Box<dyn std::error::Error>> {
145                        if let Document::Element(_, inner_doc, _) = element {
146                            let mut author_name = AuthorName::default();
147                            if let Document::Nested(inner_elements) = inner_doc.as_ref() {
148                                inner_elements.iter().try_for_each(
149                                    |inner_element| -> Result<(), Box<dyn std::error::Error>> {
150                                        if let Document::Element(tag, content, _) = inner_element {
151                                            author_name.update_field(tag, content)?;
152                                        }
153                                        Ok(())
154                                    },
155                                )?;
156                                self.authors.push(author_name);
157                            } else {
158                                return Err("Content is missing in Author authors".into());
159                            }
160                        }
161                        Ok(())
162                    },
163                )?;
164                Ok(())
165            }
166            _ => Err(format!("Unknown field in Author: {}", tag.name.local_part).into()),
167        }
168    }
169}
170
171#[derive(Debug, Default, Clone)]
172struct AuthorName {
173    first_name: String,
174    last_name: String,
175}
176impl UpdateFields for AuthorName {
177    fn update_field(
178        &mut self,
179        tag: &Tag,
180        doc: &Document,
181    ) -> Result<(), Box<dyn std::error::Error>> {
182        let field_name = &tag.name.local_part;
183
184        if let Document::Content(Some(value)) = &doc {
185            match field_name.as_str() {
186                "first_name" => {
187                    self.first_name = value.to_string();
188                    Ok(())
189                }
190                "last_name" => {
191                    self.last_name = value.to_string();
192                    Ok(())
193                }
194                e => Err(format!("Unknown field in AuthorName: {}", e).into()),
195            }
196        } else {
197            Err("Content is missing in AuthorName".into())
198        }
199    }
200}
201
202fn main() -> Result<(), Box<dyn std::error::Error>> {
203    let mut file = File::open("examples/TheExpanseSeries.xml")?;
204    let data = read_file(&mut file)?;
205    let (_, doc) = Document::parse_element_by_tag_name(&data, "catalog", &None)?;
206    let mut books = Books::default();
207
208    doc.iter_with_depth(0)
209        .filter_map(|element| {
210            if let Document::Element(tag, inner_doc, _) = element {
211                Some((tag, inner_doc))
212            } else {
213                None
214            }
215        })
216        .try_for_each(|(tag, inner_doc)| books.update_field(tag, inner_doc))
217        .map_err(|e| {
218            println!("Error updating field: {}", e);
219            e
220        })?;
221
222    println!("{books:#?}");
223    Ok(())
224}

Trait Implementations§

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impl Clone for Document

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fn clone(&self) -> Document

Returns a copy of the value. Read more
1.0.0 · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Document

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl DynamicEquality for Document

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fn equals(&self, pattern: Pattern<'_>, method: ComparisonMethod) -> bool

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impl<'a> IntoIterator for &'a Document

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type Item = &'a Document

The type of the elements being iterated over.
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type IntoIter = DocumentIterator<'a>

Which kind of iterator are we turning this into?
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fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value. Read more
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impl<'a> Parse<'a> for Document

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fn parse(input: &'a str, args: Self::Args) -> Self::Output

use nom_xml::{parse::Parse, config::Config, Document};

let xml = "<root><child>Content</child></root>";
let (_, doc) = Document::parse(xml, &Config::default()).unwrap();
println!("{doc:?}");
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type Args = &'a Config

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type Output = Result<(&'a str, Document), Err<Error>>

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fn is_char(c: char) -> bool

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fn parse_char(input: &str) -> IResult<&str, char>

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fn is_whitespace(c: char) -> bool

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fn parse_multispace1(input: &str) -> IResult<&str, ()>

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fn parse_multispace0(input: &str) -> IResult<&str, ()>

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fn is_name_start_char(c: char) -> bool

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fn is_name_char(c: char) -> bool

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fn parse_name_char(input: &str) -> IResult<&str, char>

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fn parse_name_start_char(input: &str) -> IResult<&str, char>

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fn parse_nmtoken(input: &str) -> IResult<&str, String>

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fn parse_nmtokens(input: &str) -> IResult<&str, Vec<String>>

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fn parse_name(input: &str) -> IResult<&str, Name>

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fn parse_names(input: &str) -> IResult<&str, Vec<Name>>

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fn parse_eq(input: &str) -> IResult<&str, ()>

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fn capture_span<O, F>( f: F, ) -> Box<dyn FnMut(&'a str) -> IResult<&'a str, (&'a str, O)> + 'a>
where F: FnMut(&'a str) -> IResult<&'a str, O> + 'a,

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impl<'a> ParseNamespace<'a> for Document

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fn parse_namespace_attribute_name(input: &str) -> IResult<&str, Name>

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fn parse_prefixed_attribute_name(input: &str) -> IResult<&str, Name>

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fn parse_non_colonized_name(input: &str) -> IResult<&str, String>

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fn parse_non_colonized_name_char(input: &str) -> IResult<&str, char>

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fn parse_non_colonized_name_start_char(input: &str) -> IResult<&str, char>

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fn parse_qualified_name(input: &str) -> IResult<&str, Name>

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fn parse_prefixed_name(input: &str) -> IResult<&str, Name>

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impl PartialEq for Document

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fn eq(&self, other: &Document) -> bool

Tests for self and other values to be equal, and is used by ==.
1.0.0 · Source§

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Eq for Document

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impl StructuralPartialEq for Document

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.