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use super::forked::parser::*;
use super::forked::scanner::{Marker, ScanError, TokenType};
use crate::Byml;
use std::collections::BTreeMap;
use std::error::Error;
use std::f64;
use std::i64;
use std::mem;
impl Byml {
/// Read a BYML document from a YAML string. The input YAML format is the same as that used
/// by the `byml` and `oead` Python libraries.
pub fn from_text(text: &str) -> Result<Byml, Box<dyn Error>> {
let mut result = BymlLoader::load_from_str(text)?;
Ok(std::mem::take(
result.get_mut(0).ok_or("No document parsed")?,
))
}
}
type Hash = BTreeMap<String, Byml>;
#[derive(Debug)]
pub struct BymlLoader {
docs: Vec<Byml>,
doc_stack: Vec<(Byml, usize)>,
key_stack: Vec<String>,
}
impl MarkedEventReceiver for BymlLoader {
fn on_event(&mut self, ev: Event, _: Marker) {
// println!("EV {:?}", ev);
match ev {
Event::DocumentStart => {
// do nothing
}
Event::DocumentEnd => {
match self.doc_stack.len() {
// empty document
0 => self.docs.push(Byml::Null),
1 => self.docs.push(self.doc_stack.pop().unwrap().0),
_ => unreachable!(),
}
}
Event::SequenceStart(aid, _) => {
self.doc_stack.push((Byml::Array(Vec::new()), aid));
}
Event::SequenceEnd => {
let node = self.doc_stack.pop().unwrap();
self.insert_new_node(node);
}
Event::MappingStart(aid, _) => {
self.doc_stack.push((Byml::Hash(Hash::new()), aid));
self.key_stack.push(String::new());
}
Event::MappingEnd => {
self.key_stack.pop().unwrap();
let node = self.doc_stack.pop().unwrap();
self.insert_new_node(node);
}
Event::Scalar(v, _style, aid, tag) => {
let node = if let Some(TokenType::Tag(ref handle, ref suffix)) = tag {
if handle == "!!" {
match suffix.as_ref() {
"bool" => {
// "true" or "false"
match v.parse::<bool>() {
Err(_) => Byml::Null,
Ok(v) => Byml::Bool(v),
}
}
"int" => match v.parse::<i32>() {
Err(_) => Byml::Null,
Ok(v) => Byml::Int(v),
},
"float" => match v.parse::<f32>() {
Ok(v) => Byml::Float(v.into()),
Err(_) => Byml::Null,
},
"null" => match v.as_ref() {
"~" | "null" => Byml::Null,
_ => Byml::Null,
},
"binary" => {
match base64::decode_config(
v.split_whitespace().collect::<String>().as_bytes(),
base64::STANDARD_NO_PAD,
) {
Ok(v) => Byml::Binary(v),
Err(e) => Byml::String(format!("{:?}", e)),
}
}
_ => Byml::String(v),
}
} else if handle == "!" {
match suffix.as_ref() {
"u" => match parse_int::parse::<u32>(v.as_ref()) {
Ok(v) => Byml::UInt(v),
Err(_) => Byml::Null,
},
"l" => match v.parse::<i64>() {
Ok(v) => Byml::Int64(v),
Err(_) => Byml::Null,
},
"f64" => match v.parse::<f64>() {
Ok(v) => Byml::Double(v.into()),
Err(_) => Byml::Null,
},
"ul" => match v.parse::<u64>() {
Ok(v) => Byml::UInt64(v),
Err(_) => Byml::Null,
},
"binary" => {
match base64::decode_config(
v.split_whitespace().collect::<String>().as_bytes(),
base64::STANDARD_NO_PAD,
) {
Ok(v) => Byml::Binary(v),
Err(e) => Byml::String(format!("{:?}", e)),
}
}
_ => Byml::String(v),
}
} else {
Byml::String(v)
}
} else {
match v.parse::<i32>() {
Ok(v) => Byml::Int(v),
Err(_) => match v.parse::<f32>() {
Ok(v) => Byml::Float(v.into()),
Err(_) => match v.as_ref() {
"true" => Byml::Bool(true),
"false" => Byml::Bool(false),
_ => Byml::String(v),
},
},
}
};
self.insert_new_node((node, aid));
}
Event::Alias(_) => (),
_ => { /* ignore */ }
}
}
}
impl BymlLoader {
fn insert_new_node(&mut self, mut node: (Byml, usize)) {
if self.doc_stack.is_empty() {
self.doc_stack.push(node);
} else {
let parent = self.doc_stack.last_mut().unwrap();
match *parent {
(Byml::Array(ref mut v), _) => v.push(node.0),
(Byml::Hash(ref mut h), _) => {
let cur_key = self.key_stack.last_mut().unwrap();
// current node is a key
if cur_key.as_bytes() == b"" {
*cur_key = match node.0.as_mut_string() {
Ok(v) => std::mem::take(v),
Err(_) => node.0.as_int().unwrap().to_string(),
};
// current node is a value
} else {
let mut newkey = String::new();
mem::swap(&mut newkey, cur_key);
h.insert(newkey, node.0);
}
}
_ => unreachable!(),
}
}
}
pub fn load_from_str(source: &str) -> Result<Vec<Byml>, ScanError> {
let mut loader = BymlLoader {
docs: Vec::new(),
doc_stack: Vec::new(),
key_stack: Vec::new(),
};
let mut parser = Parser::new(source.chars());
parser.load(&mut loader, true)?;
Ok(loader.docs)
}
}