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pub(crate) struct Children {
children: Vec<rnix::SyntaxElement>,
current_index: usize,
}
pub(crate) enum Trivia {
Comment(String),
Whitespace(String),
}
impl Children {
pub fn new(
build_ctx: &crate::builder::BuildCtx,
node: &rnix::SyntaxNode,
) -> Children {
let mut children: Vec<rnix::SyntaxElement> = Vec::new();
// Updating the position is costly,
// so let's just do it when really needed
let mut pos = {
let has_comments = node.children_with_tokens().any(|child| {
matches!(child.kind(), rnix::SyntaxKind::TOKEN_COMMENT)
});
if has_comments { Some(build_ctx.pos_old.clone()) } else { None }
};
for child in node.children_with_tokens() {
match child {
rnix::SyntaxElement::Node(node) => {
match node.kind() {
rnix::SyntaxKind::NODE_PAREN => {
let mut simplified = node.clone();
while matches!(
simplified.kind(),
rnix::SyntaxKind::NODE_PAREN
) {
let mut children = crate::children2::new(
build_ctx,
&simplified,
);
let opener = children.next().unwrap();
let expression = children.next().unwrap();
let closer = children.next().unwrap();
if !opener.has_inline_comment
&& !opener.has_comments
&& !expression.has_inline_comment
&& !expression.has_comments
&& !closer.has_inline_comment
&& !closer.has_comments
&& matches!(
expression.element.kind(),
rnix::SyntaxKind::NODE_ATTR_SET
| rnix::SyntaxKind::NODE_IDENT
| rnix::SyntaxKind::NODE_LIST
| rnix::SyntaxKind::NODE_LITERAL
| rnix::SyntaxKind::NODE_PAREN
| rnix::SyntaxKind::NODE_PATH_WITH_INTERPOL
| rnix::SyntaxKind::NODE_STRING
)
{
simplified =
expression.element.into_node().unwrap();
} else {
break;
}
}
children.push(simplified.into());
}
_ => {
children.push(node.clone().into());
}
}
if let Some(ref mut pos) = pos {
pos.update(&node.text().to_string());
}
}
rnix::SyntaxElement::Token(token) => {
match token.kind() {
rnix::SyntaxKind::TOKEN_COMMENT => {
children.push(
crate::builder::make_isolated_token(
rnix::SyntaxKind::TOKEN_COMMENT,
&dedent_comment(
pos.as_ref().unwrap(),
token.text(),
),
)
.into(),
);
}
rnix::SyntaxKind::TOKEN_WHITESPACE => {
if crate::utils::count_newlines(token.text()) > 0 {
children.push(token.clone().into());
}
}
_ => {
children.push(token.clone().into());
}
}
if let Some(ref mut pos) = pos {
pos.update(token.text());
}
}
}
}
Children { children, current_index: 0 }
}
pub fn get(&mut self, index: usize) -> Option<rnix::SyntaxElement> {
if index + 1 > self.children.len() {
None
} else {
Some(self.children[index].clone())
}
}
pub fn get_next(&mut self) -> Option<rnix::SyntaxElement> {
let child = self.get(self.current_index);
self.move_next();
child
}
pub fn get_remaining(&mut self) -> Vec<rnix::SyntaxElement> {
let remaining = &self.children[self.current_index..self.children.len()];
self.current_index = self.children.len();
remaining.to_vec()
}
pub fn has_next(&self) -> bool {
self.current_index < self.children.len()
}
pub fn peek_next(&mut self) -> Option<rnix::SyntaxElement> {
self.get(self.current_index)
}
pub fn move_next(&mut self) {
self.current_index += 1
}
pub fn move_prev(&mut self) {
self.current_index -= 1
}
pub fn has_comments(&self) -> bool {
self.children
.iter()
.any(|child| child.kind() == rnix::SyntaxKind::TOKEN_COMMENT)
}
pub fn has_newlines(&self) -> bool {
self.children.iter().any(|child| {
child.kind() == rnix::SyntaxKind::TOKEN_WHITESPACE
&& crate::utils::has_newlines(
child.as_token().as_ref().unwrap().text(),
)
})
}
pub fn drain_trivia<F: FnMut(Trivia)>(&mut self, mut callback: F) {
while let Some(child) = self.peek_next() {
match child.kind() {
rnix::SyntaxKind::TOKEN_COMMENT => {
callback(Trivia::Comment(
child.into_token().unwrap().text().to_string(),
));
self.move_next();
}
rnix::SyntaxKind::TOKEN_WHITESPACE => {
callback(Trivia::Whitespace(
child.as_token().as_ref().unwrap().text().to_string(),
));
self.move_next();
}
_ => {
break;
}
}
}
}
}
fn dedent_comment(pos: &crate::position::Position, text: &str) -> String {
if text.starts_with('#') {
text.to_string()
} else {
let mut lines: Vec<String> = text[2..text.len() - 2]
.lines()
.map(|line| line.to_string())
.collect();
// If all lines are whitespace just return a compact comment
if lines.iter().all(|line| line.trim().is_empty()) {
return "/**/".to_string();
}
// Make sure it starts with empty line
if lines.len() == 1 {
lines.insert(0, "".to_string());
lines[1] = format!("{0:<1$}{2}", "", pos.column + 2, lines[1]);
} else if lines[0].trim().is_empty() {
lines[0] = "".to_string();
} else {
lines.insert(0, format!("{0:<1$}", "", pos.column + 1));
lines[1] = format!("{0:<1$}{2}", "", pos.column + 2, lines[1]);
}
// Make sure it ends with empty line
let len = lines.len();
if len == 2 {
lines.push(format!("{0:<1$}", "", pos.column + 1));
} else if lines[len - 1].trim().is_empty() {
lines[len - 1] = format!("{0:<1$}", "", pos.column + 1)
} else {
lines.push(format!("{0:<1$}", "", pos.column + 1));
}
// Compute the distance to the first character from the left
let mut indentation: usize = usize::MAX;
for (index, line) in lines.iter().enumerate() {
if index != 0 && index + 1 != lines.len() {
let line = line.trim_end();
if !line.is_empty() {
indentation = usize::min(
indentation,
line.len() - line.trim_start().len(),
);
}
}
}
if indentation == usize::MAX {
indentation = pos.column;
};
// Re-align everything with respect to the vertical
lines = lines
.iter()
.enumerate()
.map(|(index, line)| {
if index == 0 || index + 1 == lines.len() {
line.to_string()
} else if pos.column >= indentation {
format!(
"{0:<1$}{2}",
"",
pos.column - indentation + 1,
line,
)
} else if line.len() >= indentation - pos.column {
line[indentation - pos.column - 1..line.len()].to_string()
} else {
line.to_string()
}
})
.collect();
// Dedent everything as much as possible so that upstream components
// can indent as they see convenient
lines = lines
.iter()
.enumerate()
.map(|(index, line)| {
if index == 0 {
line.to_string()
} else if line.len() > pos.column {
line[pos.column + 1..line.len()].to_string()
} else {
line.to_string()
}
})
.collect();
format!("/*{}*/", lines.join("\n"))
}
}