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// Copyright (C) 2019 Oscar Shrimpton
//
// This file is part of stockton-bsp.
//
// stockton-bsp is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// stockton-bsp is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with stockton-bsp. If not, see <http://www.gnu.org/licenses/>.
use std::str;
use std::collections::HashMap;
use crate::types::{Result, ParseError};
use crate::traits::entities::*;
use super::Q3BSPFile;
const QUOTE: u8 = b'"';
const END_BRACKET: u8 = b'}';
const START_BRACKET: u8 = b'{';
/// Internal enum to parse through the entities string.
#[derive(PartialEq, Eq)]
enum ParseState {
InKey,
InValue,
AfterKey,
InsideEntity,
OutsideEntity,
}
/// Parse the given data as an Entities lump
pub fn from_data(data: &[u8]) -> Result<Box<[Entity]>> {
use self::ParseState::*;
let string = str::from_utf8(data).unwrap();
let mut attrs = HashMap::new();
let mut entities = Vec::new();
let mut state = ParseState::OutsideEntity;
let mut key_start = 0;
let mut key_end = 0;
let mut val_start = 0;
let mut val_end;
for (i, chr) in string.bytes().enumerate() {
match chr {
QUOTE => match state {
InsideEntity => {
state = ParseState::InKey;
key_start = i + 1;
}
InKey => {
state = ParseState::AfterKey;
key_end = i;
}
AfterKey => {
state = ParseState::InValue;
val_start = i + 1;
}
InValue => {
state = ParseState::InsideEntity;
val_end = i;
attrs.insert(string[key_start..key_end].to_owned(), string[val_start..val_end].to_owned());
}
_ => {
return Err(ParseError::Invalid);
}
},
END_BRACKET => {
if state != InsideEntity {
return Err(ParseError::Invalid);
}
state = OutsideEntity;
entities.push(Entity { attributes: attrs });
attrs = HashMap::new();
}
START_BRACKET => {
if state != OutsideEntity {
return Err(ParseError::Invalid);
}
state = InsideEntity;
}
_ => {}
}
}
Ok(entities.into_boxed_slice())
}
impl HasEntities for Q3BSPFile {
type EntitiesIter<'a> = std::slice::Iter<'a, Entity>;
fn entities_iter<'a>(&'a self) -> Self::EntitiesIter<'a> {
self.entities.iter()
}
}
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