swc_css_minifier/compressor/supports.rs
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use std::mem::take;
use swc_common::DUMMY_SP;
use swc_css_ast::*;
use super::Compressor;
use crate::util::dedup;
impl Compressor {
fn is_first_supports_in_parens(&self, supports_condition: &SupportsCondition) -> bool {
if let Some(SupportsConditionType::SupportsInParens(_)) =
supports_condition.conditions.first()
{
true
} else {
false
}
}
fn is_first_or_supports_type(&self, supports_condition: &SupportsCondition) -> bool {
matches!(
supports_condition.conditions.get(1),
Some(SupportsConditionType::Or(_))
)
}
fn is_first_and_supports_type(&self, supports_condition: &SupportsCondition) -> bool {
matches!(
supports_condition.conditions.get(1),
Some(SupportsConditionType::And(_))
)
}
pub(super) fn compress_supports_condition(&mut self, n: &mut SupportsCondition) {
match n.conditions.get(1) {
Some(SupportsConditionType::Or(_)) => {
let need_compress = n.conditions.iter().any(|item| match item {
SupportsConditionType::SupportsInParens(
SupportsInParens::SupportsCondition(supports_condition),
) if self.is_first_or_supports_type(supports_condition)
&& self.is_first_supports_in_parens(supports_condition) =>
{
true
}
SupportsConditionType::Or(supports_or) => match &*supports_or.condition {
SupportsInParens::SupportsCondition(supports_condition)
if self.is_first_or_supports_type(supports_condition)
&& self.is_first_supports_in_parens(supports_condition) =>
{
true
}
_ => false,
},
_ => false,
});
if need_compress {
let mut new_conditions = Vec::with_capacity(n.conditions.len());
for item in take(&mut n.conditions) {
match item {
SupportsConditionType::SupportsInParens(
SupportsInParens::SupportsCondition(supports_condition),
) if self.is_first_or_supports_type(&supports_condition)
&& self.is_first_supports_in_parens(&supports_condition) =>
{
let mut iter = supports_condition.conditions.into_iter();
if let Some(SupportsConditionType::SupportsInParens(
supports_in_parens,
)) = iter.next()
{
new_conditions.push(SupportsConditionType::SupportsInParens(
supports_in_parens,
));
new_conditions.extend(iter);
}
}
SupportsConditionType::Or(supports_or) => {
match *supports_or.condition {
SupportsInParens::SupportsCondition(supports_condition)
if self.is_first_or_supports_type(&supports_condition)
&& self.is_first_supports_in_parens(
&supports_condition,
) =>
{
let mut iter = supports_condition.conditions.into_iter();
if let Some(SupportsConditionType::SupportsInParens(
supports_in_parens,
)) = iter.next()
{
new_conditions.push(SupportsConditionType::Or(
SupportsOr {
span: DUMMY_SP,
keyword: None,
condition: Box::new(supports_in_parens),
},
));
new_conditions.extend(iter);
}
}
_ => {
new_conditions.push(SupportsConditionType::Or(supports_or));
}
}
}
_ => {
new_conditions.push(item);
}
}
}
n.conditions = new_conditions;
}
}
Some(SupportsConditionType::And(_)) => {
let need_compress = n.conditions.iter().any(|item| match item {
SupportsConditionType::SupportsInParens(
SupportsInParens::SupportsCondition(supports_condition),
) if self.is_first_and_supports_type(supports_condition)
&& self.is_first_supports_in_parens(supports_condition) =>
{
true
}
SupportsConditionType::And(supports_and) => match &*supports_and.condition {
SupportsInParens::SupportsCondition(supports_condition)
if self.is_first_and_supports_type(supports_condition)
&& self.is_first_supports_in_parens(supports_condition) =>
{
true
}
_ => false,
},
_ => false,
});
if need_compress {
let mut new_conditions = Vec::with_capacity(n.conditions.len());
for item in take(&mut n.conditions) {
match item {
SupportsConditionType::SupportsInParens(
SupportsInParens::SupportsCondition(supports_condition),
) if self.is_first_and_supports_type(&supports_condition)
&& self.is_first_supports_in_parens(&supports_condition) =>
{
let mut iter = supports_condition.conditions.into_iter();
if let Some(SupportsConditionType::SupportsInParens(
supports_in_parens,
)) = iter.next()
{
new_conditions.push(SupportsConditionType::SupportsInParens(
supports_in_parens,
));
new_conditions.extend(iter);
}
}
SupportsConditionType::And(supports_and) => match *supports_and
.condition
{
SupportsInParens::SupportsCondition(supports_condition)
if self.is_first_and_supports_type(&supports_condition)
&& self
.is_first_supports_in_parens(&supports_condition) =>
{
let mut iter = supports_condition.conditions.into_iter();
if let Some(SupportsConditionType::SupportsInParens(
supports_in_parens,
)) = iter.next()
{
new_conditions.push(SupportsConditionType::And(
SupportsAnd {
span: DUMMY_SP,
keyword: None,
condition: Box::new(supports_in_parens),
},
));
new_conditions.extend(iter);
}
}
_ => {
new_conditions.push(SupportsConditionType::And(supports_and));
}
},
_ => {
new_conditions.push(item);
}
}
}
n.conditions = new_conditions;
}
}
_ => {}
}
dedup(&mut n.conditions);
}
pub(super) fn compress_supports_in_parens(&mut self, n: &mut SupportsInParens) {
match n {
SupportsInParens::SupportsCondition(supports_condition)
if supports_condition.conditions.len() == 1 =>
{
if let Some(SupportsConditionType::SupportsInParens(supports_in_parens)) =
supports_condition.conditions.first()
{
*n = supports_in_parens.clone();
}
}
_ => {}
}
}
}