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use crate::error::{Error, FormatCode::Tag as TagCode};
use crate::util::illegal_name;
use crate::{impl_de_by_from_str, impl_ser_by_to_string};
use fxhash::FxHashSet as HashSet;
use std::fmt::{Display, Formatter, Result as FmtResult};
use std::str::FromStr;
#[derive(Debug, Clone, Eq, PartialEq, Default)]
pub struct TagFilterGroup(Vec<TagFilter>);
impl TagFilterGroup {
pub fn push(&mut self, filter: TagFilter) {
if filter.append {
self.0.push(filter);
} else {
self.0 = vec![filter];
}
}
pub fn filter(&self, tags: &[&Tag]) -> bool {
let mut pass = false;
for f in self.0.iter() {
let res = f.filter(tags);
if f.mandatory {
if res != Some(true) {
return false;
}
} else if let Some(res) = res {
pass = res;
}
}
pass
}
}
impl From<TagFilter> for TagFilterGroup {
fn from(t: TagFilter) -> Self {
TagFilterGroup(vec![t])
}
}
#[derive(Debug, Clone, Eq, PartialEq)]
pub struct TagFilter {
tags: Vec<TagControl>,
pub append: bool,
pub mandatory: bool,
}
impl_de_by_from_str!(TagFilter);
impl_ser_by_to_string!(TagFilter);
#[derive(Debug, Clone, Eq, PartialEq)]
pub struct TagControl {
allow: bool,
tag: Tag,
}
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct Tag(String);
impl AsRef<str> for Tag {
fn as_ref(&self) -> &str {
&self.0
}
}
impl Tag {
pub fn match_all(&self) -> bool {
&self.0 == "all"
}
}
impl Display for Tag {
fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
write!(f, "{}", self.0)
}
}
impl FromStr for Tag {
type Err = Error;
fn from_str(s: &str) -> Result<Self, Error> {
if illegal_name(s) {
log::error!("標籤格式不符：{}", s);
return Err(Error::Format(TagCode, s.to_owned()));
}
Ok(Tag(s.to_owned()))
}
}
impl FromStr for TagControl {
type Err = Error;
fn from_str(mut s: &str) -> std::result::Result<Self, Error> {
let allow = if s.starts_with('^') {
s = &s[1..s.len()];
false
} else {
true
};
Ok(TagControl {
tag: s.parse()?,
allow,
})
}
}
const OBLIGATION_PREFIX: &str = "m/";
impl FromStr for TagFilter {
type Err = Error;
fn from_str(mut s: &str) -> std::result::Result<Self, Error> {
let append = if s.starts_with('+') {
s = &s[1..];
true
} else {
false
};
let mandatory = if s.starts_with(OBLIGATION_PREFIX) {
s = &s[OBLIGATION_PREFIX.len()..];
true
} else {
false
};
let mut tags = vec![];
for filter in s.split(',') {
tags.push(filter.parse()?);
}
if tags.is_empty() {
return Err(Error::Format(TagCode, s.to_owned()));
}
Ok(TagFilter {
tags,
append,
mandatory,
})
}
}
impl Display for TagFilter {
fn fmt(&self, w: &mut Formatter<'_>) -> FmtResult {
let mut first = true;
if self.append {
write!(w, "+")?;
}
if self.mandatory {
write!(w, "m/")?;
}
for f in self.tags.iter() {
if !first {
write!(w, ",")?;
}
first = false;
if !f.allow {
write!(w, "^")?;
}
write!(w, "{}", f.tag.0)?;
}
Ok(())
}
}
impl TagFilter {
pub fn push(&mut self, flow: Self) {
if flow.append {
self.tags.extend(flow.tags.into_iter());
} else {
*self = flow
}
}
pub fn fill_allowed_map<U>(self, set: &mut std::collections::HashSet<Tag, U>)
where
U: std::hash::BuildHasher,
{
for control in self.tags.into_iter() {
if control.allow {
if control.tag.match_all() {
continue;
}
set.insert(control.tag);
} else {
if control.tag.match_all() {
set.clear();
continue;
}
set.remove(&control.tag);
}
}
}
pub fn into_allowed_iter(self) -> impl Iterator<Item = Tag> {
let mut set = HashSet::default();
self.fill_allowed_map(&mut set);
set.into_iter()
}
pub fn filter(&self, tags: &[&Tag]) -> Option<bool> {
let mut pass: Option<bool> = None;
for filter in self.tags.iter() {
if filter.tag.match_all() || tags.contains(&&filter.tag) {
pass = Some(filter.allow);
}
}
pass
}
}