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//! LSX file reading
//!
//!
#![allow(clippy::too_many_lines)]
use super::document::{LsxAttribute, LsxDocument, LsxNode, LsxRegion};
use crate::error::{Error, Result};
use quick_xml::Reader;
use quick_xml::events::Event;
use std::fs;
use std::path::Path;
/// Read an LSX file from disk
///
/// # Errors
/// Returns an error if the file cannot be read or has invalid XML.
pub fn read_lsx<P: AsRef<Path>>(path: P) -> Result<LsxDocument> {
let content = fs::read_to_string(path)?;
parse_lsx(&content)
}
/// Parse LSX from XML string
///
/// # Errors
/// Returns an error if the XML is malformed or has an invalid structure.
pub fn parse_lsx(content: &str) -> Result<LsxDocument> {
let mut reader = Reader::from_str(content);
reader.trim_text(true);
let mut doc = LsxDocument {
major: 4,
minor: 0,
revision: 0,
build: 0,
regions: Vec::new(),
};
let mut buf = Vec::new();
let mut current_region: Option<LsxRegion> = None;
let mut node_stack: Vec<LsxNode> = Vec::new();
loop {
match reader.read_event_into(&mut buf) {
Ok(Event::Start(e)) => match e.name().as_ref() {
b"version" => {
for attr in e.attributes() {
let attr = attr?;
let value_str = String::from_utf8_lossy(&attr.value);
match attr.key.as_ref() {
b"major" => doc.major = value_str.parse().unwrap_or(4),
b"minor" => doc.minor = value_str.parse().unwrap_or(0),
b"revision" => doc.revision = value_str.parse().unwrap_or(0),
b"build" => doc.build = value_str.parse().unwrap_or(0),
_ => {}
}
}
}
b"region" => {
let mut region_id = String::new();
for attr in e.attributes() {
let attr = attr?;
if attr.key.as_ref() == b"id" {
region_id = String::from_utf8_lossy(&attr.value).into_owned();
}
}
current_region = Some(LsxRegion {
id: region_id,
nodes: Vec::new(),
});
}
b"node" => {
let mut node_id = String::new();
let mut node_key = None;
for attr in e.attributes() {
let attr = attr?;
match attr.key.as_ref() {
b"id" => node_id = String::from_utf8_lossy(&attr.value).into_owned(),
b"key" => {
node_key = Some(String::from_utf8_lossy(&attr.value).into_owned());
}
_ => {}
}
}
node_stack.push(LsxNode {
id: node_id,
key: node_key,
attributes: Vec::new(),
children: Vec::new(),
});
}
_ => {}
},
Ok(Event::Empty(e)) => {
match e.name().as_ref() {
b"version" => {
for attr in e.attributes() {
let attr = attr?;
let value_str = String::from_utf8_lossy(&attr.value);
match attr.key.as_ref() {
b"major" => doc.major = value_str.parse().unwrap_or(4),
b"minor" => doc.minor = value_str.parse().unwrap_or(0),
b"revision" => doc.revision = value_str.parse().unwrap_or(0),
b"build" => doc.build = value_str.parse().unwrap_or(0),
_ => {}
}
}
}
b"attribute" => {
let mut attr_id = String::new();
let mut attr_type = String::new();
let mut attr_value = String::new();
let mut handle = None;
let mut version = None;
for attr in e.attributes() {
let attr = attr?;
match attr.key.as_ref() {
b"id" => {
attr_id = String::from_utf8_lossy(&attr.value).into_owned();
}
b"type" => {
attr_type = String::from_utf8_lossy(&attr.value).into_owned();
}
b"value" => {
attr_value = String::from_utf8_lossy(&attr.value).into_owned();
}
b"handle" => {
handle =
Some(String::from_utf8_lossy(&attr.value).into_owned());
}
b"version" => {
version = attr
.value
.as_ref()
.iter()
.map(|&b| b as char)
.collect::<String>()
.parse()
.ok();
}
_ => {}
}
}
if let Some(node) = node_stack.last_mut() {
node.attributes.push(LsxAttribute {
id: attr_id,
type_name: attr_type,
value: attr_value,
handle,
version,
});
}
}
b"node" => {
// Self-closing node with no attributes/children
let mut node_id = String::new();
let mut node_key = None;
for attr in e.attributes() {
let attr = attr?;
match attr.key.as_ref() {
b"id" => {
node_id = String::from_utf8_lossy(&attr.value).into_owned();
}
b"key" => {
node_key =
Some(String::from_utf8_lossy(&attr.value).into_owned());
}
_ => {}
}
}
let empty_node = LsxNode {
id: node_id,
key: node_key,
attributes: Vec::new(),
children: Vec::new(),
};
if let Some(parent) = node_stack.last_mut() {
parent.children.push(empty_node);
} else if let Some(ref mut region) = current_region {
region.nodes.push(empty_node);
}
}
_ => {}
}
}
Ok(Event::End(e)) => match e.name().as_ref() {
b"node" => {
if let Some(completed_node) = node_stack.pop() {
if let Some(parent) = node_stack.last_mut() {
parent.children.push(completed_node);
} else if let Some(ref mut region) = current_region {
region.nodes.push(completed_node);
}
}
}
b"region" => {
if let Some(region) = current_region.take() {
doc.regions.push(region);
}
}
_ => {}
},
Ok(Event::Eof) => break,
Err(e) => return Err(Error::XmlError(e)),
_ => {}
}
buf.clear();
}
Ok(doc)
}