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use std::io;
use byteorder::{ByteOrder, LittleEndian, WriteBytesExt};
use serde::{Deserialize, Serialize};
#[derive(Clone, Copy, Debug, Eq, PartialEq, Serialize, Deserialize)]
pub struct WordId(pub u32, pub bool);
impl WordId {
pub fn is_unknown(&self) -> bool {
self.0 == std::u32::MAX
}
pub fn is_system(&self) -> bool {
self.1
}
}
impl Default for WordId {
fn default() -> Self {
WordId(std::u32::MAX, true)
}
}
#[derive(Default, Clone, Copy, Debug, Eq, PartialEq, Serialize, Deserialize)]
pub struct WordEntry {
pub word_id: WordId,
pub word_cost: i16,
pub cost_id: u16,
}
impl WordEntry {
pub const SERIALIZED_LEN: usize = 8;
pub fn left_id(&self) -> u32 {
self.cost_id as u32
}
pub fn right_id(&self) -> u32 {
self.cost_id as u32
}
pub fn serialize<W: io::Write>(&self, wtr: &mut W) -> io::Result<()> {
wtr.write_u32::<LittleEndian>(self.word_id.0)?;
wtr.write_i16::<LittleEndian>(self.word_cost)?;
wtr.write_u16::<LittleEndian>(self.cost_id)?;
Ok(())
}
pub fn deserialize(data: &[u8], is_system_entry: bool) -> WordEntry {
let word_id = WordId(LittleEndian::read_u32(&data[0..4]), is_system_entry);
let word_cost = LittleEndian::read_i16(&data[4..6]);
let cost_id = LittleEndian::read_u16(&data[6..8]);
WordEntry {
word_id,
word_cost,
cost_id,
}
}
}
#[cfg(test)]
mod tests {
use crate::word_entry::{WordEntry, WordId};
#[test]
fn test_word_entry() {
let mut buffer = Vec::new();
let word_entry = WordEntry {
word_id: WordId(1u32, true),
word_cost: -17i16,
cost_id: 1411u16,
};
word_entry.serialize(&mut buffer).unwrap();
assert_eq!(WordEntry::SERIALIZED_LEN, buffer.len());
let word_entry2 = WordEntry::deserialize(&buffer[..], true);
assert_eq!(word_entry, word_entry2);
}
}