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use crate::{
attribute::{Attribute, AttributeValue, DefaultDecl},
error::Error,
namespaces::ParseNamespace,
parse::Parse,
prolog::subset::entity::{entity_value::EntityValue, EntitySource},
IResult, Name,
};
use nom::{
branch::alt,
bytes::complete::tag,
combinator::{map, map_res, opt},
multi::{many0, many1},
sequence::{delimited, pair, tuple},
};
use std::{cell::RefCell, collections::HashMap, rc::Rc};
#[derive(Clone, Debug, PartialEq, Eq)]
pub enum TagState {
Start,
End,
Empty,
}
#[derive(Clone, PartialEq, Eq)]
pub struct Tag {
pub name: Name,
pub attributes: Option<Vec<Attribute>>, // Attribute::Instance
pub state: TagState,
}
impl<'a> Parse<'a> for Tag {
type Args = ();
type Output = IResult<&'a str, Self>;
}
impl<'a> ParseNamespace<'a> for Tag {}
// TODO: Investigate. The hardcoded bracket codes is kind of a hack to get reference element parsing to work. Unsure of how this is going to impact invalid XML.
// Tried to use decode, but having some lifetime issues
impl Tag {
pub fn new(name: Name, attributes: Option<Vec<Attribute>>, state: TagState) -> Self {
Self {
name,
attributes,
state,
}
}
// [40] STag ::= '<' Name (S Attribute)* S? '>'
// Namespaces (Third Edition) [12] STag ::= '<' QName (S Attribute)* S? '>'
pub fn parse_start_tag(
input: &str,
entity_references: Rc<RefCell<HashMap<(Name, EntitySource), EntityValue>>>,
entity_source: EntitySource,
) -> IResult<&str, Self> {
map(
tuple((
alt((tag("<"), tag("<"), tag("<"))),
alt((Self::parse_qualified_name, Self::parse_name)),
many0(pair(Self::parse_multispace1, |i| {
Attribute::parse_attribute(i, entity_references.clone(), entity_source.clone())
})),
Self::parse_multispace0,
alt((tag(">"), tag(">"), tag(">"))),
)),
|(_open_char, name, attributes, _whitespace, _close_char)| {
let attributes: Vec<_> = attributes
.into_iter()
.map(|(_whitespace, attr)| attr)
.collect();
Self {
name,
attributes: if attributes.is_empty() {
// check doctype here, if within that, add them to the tag else, None
None
} else {
Some(attributes)
},
state: TagState::Start,
}
},
)(input)
}
pub fn parse_start_tag_by_name<'a>(
input: &'a str,
tag_name: &'a str,
attributes: &Option<Vec<Attribute>>,
entity_references: &Rc<RefCell<HashMap<(Name, EntitySource), EntityValue>>>,
entity_source: EntitySource,
) -> IResult<&'a str, Self> {
let mut current_input = input;
loop {
let result: IResult<&'a str, Self> = map_res(
tuple((
alt((tag("<"), tag("<"), tag("<"))),
map_res(
alt((Self::parse_qualified_name, Self::parse_name)),
|name| {
if name.local_part == tag_name {
Ok(name)
} else {
Err(nom::Err::Error(nom::error::Error::new(
"Start Tag doesn't match",
nom::error::ErrorKind::Tag,
)))
}
},
),
many0(pair(Self::parse_multispace1, |i| {
Attribute::parse_attribute(i, entity_references.clone(), entity_source.clone())
})),
Self::parse_multispace0,
alt((tag(">"), tag(">"), tag(">"))),
)),
|(_open_char, name, attributes_vec, _whitespace, _close_char)| -> Result<Self, nom::Err<Error>> {
let parsed_attributes: Vec<_> = attributes_vec
.into_iter()
.map(|(_whitespace, attr)| attr)
.collect();
if let Some(expected_attributes) = attributes {
if expected_attributes == &parsed_attributes {
Ok(Self {
name,
attributes: if parsed_attributes.is_empty() {
None
} else {
Some(parsed_attributes)
},
state: TagState::Start,
})
} else {
Err(nom::Err::Error(nom::error::Error::new(
"Attributes do not match",
nom::error::ErrorKind::Tag,
).into()))
}
} else {
Ok(Self {
name,
attributes: if parsed_attributes.is_empty() {
None
} else {
Some(parsed_attributes)
},
state: TagState::Start,
})
}
},
)(current_input);
match result {
Ok((next_input, tag)) => return Ok((next_input, tag)),
Err(nom::Err::Error(_)) => {
if current_input.is_empty() {
return Err(nom::Err::Error(
nom::error::Error::new(current_input, nom::error::ErrorKind::Tag)
.into(),
));
}
// Move forward in the input string to avoid infinite loop
current_input = ¤t_input[1..];
}
Err(e) => return Err(e),
}
}
}
// [42] ETag ::= '</' Name S? '>'
// Namespaces (Third Edition) [13] ETag ::= '</' QName S? '>'
pub fn parse_end_tag(input: &str) -> IResult<&str, Self> {
delimited(
alt((tag("</"), tag("</"), tag("</"))),
map(
tuple((
Self::parse_multispace0,
alt((Self::parse_qualified_name, Self::parse_name)),
Self::parse_multispace0,
)),
|(_open_tag, name, _close_tag)| Self {
name,
attributes: None, // Attributes are not parsed for end tags
state: TagState::End,
},
),
alt((tag(">"), tag(">"), tag(">"))),
)(input)
}
// [42] ETag ::= '</' Name S? '>'
// Namespaces (Third Edition) [13] ETag ::= '</' QName S? '>'
pub fn parse_end_tag_by_name<'a>(input: &'a str, tag_name: &'a str) -> IResult<&'a str, Self> {
delimited(
alt((tag("</"), tag("</"), tag("</"))),
map(
tuple((
Self::parse_multispace0,
map_res(
alt((Self::parse_qualified_name, Self::parse_name)),
|name| {
if name.local_part == tag_name {
Ok(name)
} else {
Err(nom::Err::Error(nom::error::Error::new(
"END TAG FAILING",
nom::error::ErrorKind::Tag,
)))
}
},
),
Self::parse_multispace0,
)),
|(_open_tag, name, _close_tag)| Self {
name, //: Name::new(None, name),
attributes: None, // Attributes are not parsed for end tags
state: TagState::End,
},
),
alt((tag(">"), tag(">"), tag(">"))),
)(input)
}
// [44] EmptyElemTag ::= '<' Name (S Attribute)* S? '/>'
// Namespaces (Third Edition) [14] EmptyElemTag ::= '<' QName (S Attribute)* S? '/>'
pub fn parse_empty_element_tag(
input: &str,
entity_references: Rc<RefCell<HashMap<(Name, EntitySource), EntityValue>>>,
entity_source: EntitySource,
) -> IResult<&str, Self> {
map(
tuple((
alt((tag("<"), tag("<"), tag("<"))),
alt((Self::parse_qualified_name, Self::parse_name)),
opt(many1(pair(Self::parse_multispace1, |i| {
Attribute::parse(i, (entity_references.clone(), entity_source.clone()))
}))),
Self::parse_multispace0,
alt((tag("/>"), tag("/>"), tag("/>"))),
)),
|(_open_tag, name, attributes, _whitespace, _close_tag)| Self {
name,
attributes: attributes
.map(|attr| attr.into_iter().map(|(_whitespace, attr)| attr).collect()),
state: TagState::Empty,
},
)(input)
}
// [44] EmptyElemTag ::= '<' Name (S Attribute)* S? '/>'
// Namespaces (Third Edition) [14] EmptyElemTag ::= '<' QName (S Attribute)* S? '/>'
pub fn parse_empty_element_tag_by_name<'a>(
input: &'a str,
tag_name: &'a str,
_attributes: &Option<Vec<Attribute>>, //TODO: implement empty tag attribute matching
entity_references: &Rc<RefCell<HashMap<(Name, EntitySource), EntityValue>>>,
entity_source: EntitySource,
) -> IResult<&'a str, Self> {
map(
tuple((
alt((tag("<"), tag("<"), tag("<"))),
tag(tag_name),
opt(many1(pair(Self::parse_multispace1, |i| {
Attribute::parse(i, (entity_references.clone(), entity_source.clone()))
}))),
Self::parse_multispace0,
alt((tag("/>"), tag("/>"), tag("/>"))),
)),
|(_open_tag, name, attributes, _whitespace, _close_tag)| Self {
name: Name::new(None, name),
attributes: attributes
.map(|attr| attr.into_iter().map(|(_whitespace, attr)| attr).collect()),
state: TagState::Empty,
},
)(input)
}
pub fn merge_default_attributes(&mut self, default_attributes: &[Attribute]) {
let existing_attributes = self.attributes.get_or_insert_with(Vec::new);
let mut seen_names = std::collections::HashSet::new();
for default_attr in default_attributes {
if let Attribute::Definition {
name, default_decl, ..
} = default_attr
{
if seen_names.contains(name) {
// Skip if this name has already been processed.
continue;
}
seen_names.insert(name.clone());
// Only add the attribute if it doesn't already exist and has a default value
let exists = existing_attributes.iter().any(|attr| matches!(attr, Attribute::Instance { name: existing_name, .. } if existing_name == name));
if !exists {
if let DefaultDecl::Value(val) = default_decl {
existing_attributes.push(Attribute::Instance {
name: name.clone(),
value: AttributeValue::Value(val.clone()),
});
}
}
}
}
// If no attributes were added (and none were already present), set attributes to None
if existing_attributes.is_empty() {
self.attributes = None;
}
}
pub fn add_attributes(&mut self, new_attributes: Vec<Attribute>) {
self.attributes = if new_attributes.is_empty() {
None
} else {
Some(new_attributes)
};
}
}