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// Authors: Robert Lopez
use super::{effect::Effect, Components};
use std::collections::BTreeMap;
// TODO: Handle nested effects like: @media (max-width: 800px) { &:hover { ... } }
#[derive(Debug)]
enum State {
FieldKey,
EffectKey,
FieldValue,
EffectKeyInner,
EffectValueInner,
}
impl Components {
pub(crate) fn from_css(css: &str) -> Self {
let css_bytes = css.as_bytes();
let mut fields = BTreeMap::new();
let mut effects = vec![];
let mut state = None;
let mut key_buffer = vec![];
let mut value_buffer = vec![];
let mut effect_buffer = Effect::new("".to_string());
let mut previous_byte = None::<u8>;
let mut key_inner_buffer = vec![];
let mut value_inner_buffer = vec![];
for (byte_index, byte) in css.as_bytes().iter().enumerate() {
match byte {
b'\n' => {}
b' ' => {
macro_rules! handle_space {
($buffer:expr) => {
if !$buffer.is_empty() {
let previous_byte = previous_byte.unwrap();
if previous_byte != b' '
&& previous_byte != b'('
&& !previous_byte.is_ascii_digit()
&& !css_bytes.get(byte_index + 1).is_some_and(|b| b == &b')')
{
$buffer.push(*byte);
}
}
};
}
match state {
Some(State::EffectKey) => {
handle_space!(&mut key_buffer);
}
Some(State::FieldValue) => {
handle_space!(&mut value_buffer);
}
Some(State::EffectValueInner) => {
handle_space!(&mut value_inner_buffer);
}
_ => {}
}
}
b'&' | b'@' => {
state = Some(State::EffectKey);
key_buffer.push(*byte);
}
b'{' => {
state = Some(State::EffectKeyInner);
}
b':' => match state {
Some(State::FieldKey) => {
state = Some(State::FieldValue);
}
Some(State::EffectKey) => {
key_buffer.push(*byte);
}
Some(State::EffectKeyInner) => {
state = Some(State::EffectValueInner);
}
_ => {
// TODO
}
},
b';' => match state {
Some(State::FieldValue) => {
let mut key_bytes = vec![b'\t'];
key_bytes.append(&mut key_buffer);
match state {
Some(State::FieldValue) => {
let mut value_bytes = vec![];
value_bytes.append(&mut value_buffer);
key_bytes.extend_from_slice(b": ");
value_bytes.extend_from_slice(b";\n");
unsafe {
fields.insert(
String::from_utf8_unchecked(key_bytes),
String::from_utf8_unchecked(value_bytes),
);
}
}
_ => {
// TODO
}
}
state = None;
}
Some(State::EffectValueInner) => {
let mut effect_key_bytes = vec![b'\t'; 2];
effect_key_bytes.append(&mut key_inner_buffer);
effect_key_bytes.extend_from_slice(b": ");
let mut effect_value_bytes = vec![];
effect_value_bytes.append(&mut value_inner_buffer);
effect_value_bytes.extend_from_slice(b";\n");
unsafe {
effect_buffer.fields.insert(
String::from_utf8_unchecked(effect_key_bytes),
String::from_utf8_unchecked(effect_value_bytes),
);
}
state = Some(State::EffectKeyInner);
}
_ => {
// TODO
}
},
b'}' => match state {
Some(State::EffectKeyInner) => {
let mut key_bytes = vec![b'\t'];
key_bytes.append(&mut key_buffer);
match state {
Some(State::EffectKeyInner) => {
key_bytes.extend_from_slice(b"{\n");
let mut effect =
Effect::new(unsafe { String::from_utf8_unchecked(key_bytes) });
std::mem::swap(&mut effect.fields, &mut effect_buffer.fields);
effects.push(effect);
}
_ => {
// TODO
}
}
state = None;
}
_ => {
// TODO
}
},
byte => match state {
Some(State::FieldKey) | Some(State::EffectKey) => {
key_buffer.push(*byte);
}
Some(State::FieldValue) => {
value_buffer.push(*byte);
}
Some(State::EffectKeyInner) => {
key_inner_buffer.push(*byte);
}
Some(State::EffectValueInner) => {
value_inner_buffer.push(*byte);
}
None => {
state = Some(State::FieldKey);
key_buffer.push(*byte);
}
},
}
previous_byte = Some(*byte);
}
Self { fields, effects }
}
}