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use std::path::PathBuf;
use rowan::NodeOrToken;
use crate::pipeline::Change;
pub fn apply_changes(content: &str, mut changes: Vec<Change>, debug: bool) -> String {
let mut last_pos = 0;
let mut ncontent = String::new();
changes.sort_by_key(|change| change.node.text_range().start());
for change in changes {
use crate::queries::Operator::*;
match change.kind {
Remove => {
let (before, after) = remove_node(&change.node);
if last_pos > before { continue }
ncontent += &content[last_pos..before];
if debug {
println!("removing: {}", &content[before..after])
}
last_pos = after;
}
Keep => {
let (before, after) = surrounding_noise(&change.node);
let (before, after) = eat_whitespace(&before, &after);
// let (before, after) = (change.node.text_range().start().into(), change.node.text_range().end().into());
let (before, after) = (before.text_range().start().into(), after.text_range().end().into());
if debug {
println!("keeping: {}", &content[before..after])
};
ncontent += &content[before..after];
// last_pos = after;
}
}
}
ncontent += &content[last_pos..];
ncontent
}
// TODO: does rnix really not have an alias for this?
type NixNodeOrToken = NodeOrToken<rowan::SyntaxNode<rnix::NixLanguage>, rowan::SyntaxToken<rnix::NixLanguage>>;
/// eat all tokens of the given kind (backwards or forwards)
fn eat_kind(node: &NixNodeOrToken, kind: rnix::SyntaxKind, backwards: bool) -> NixNodeOrToken {
let mut span = node.clone();
loop {
span = match if backwards { span.prev_sibling_or_token() } else { span.next_sibling_or_token() } {
Some(NodeOrToken::Token(t))
if t.kind() == kind
=> NodeOrToken::Token(t),
_ => break
};
}
span
}
/// eat whitespace outwards both ways
fn eat_whitespace(begin: &NixNodeOrToken, end: &NixNodeOrToken)
-> (NixNodeOrToken, NixNodeOrToken) {
let begin = eat_kind(begin, rnix::SyntaxKind::TOKEN_WHITESPACE, true);
let end = eat_kind(end, rnix::SyntaxKind::TOKEN_WHITESPACE, false);
(begin, end)
}
/// for a node, get all the "syntactic noise" which surrounds it
/// (i.e. brackets, whitespace, etc.) which should be removed if
/// the node itself is removed, except the final bit of whitespace
/// potentially separating it from neighbouring nodes, which should
/// be handled separately to keep formatting nice
fn surrounding_noise(node: &rnix::SyntaxNode) -> (NixNodeOrToken, NixNodeOrToken) {
fn eat_matching_parens(begin: &NixNodeOrToken, end: &NixNodeOrToken)
-> Option<(NixNodeOrToken, NixNodeOrToken)> {
match (begin.prev_sibling_or_token(), end.next_sibling_or_token()) {
(Some(begin), Some(end))
if begin.kind() == rnix::SyntaxKind::TOKEN_L_PAREN
&& end.kind() == rnix::SyntaxKind::TOKEN_R_PAREN
=> Some((begin, end)),
_ => None
}
}
let (mut begin, mut end): (NixNodeOrToken, NixNodeOrToken) =
(NodeOrToken::Node(node.clone()), NodeOrToken::Node(node.clone()));
loop {
let (a, b) = eat_whitespace(&begin, &end);
// println!("loop: {begin}, {end}");
// println!("loop: {a}, {b}");
// println!("{:?}", (begin.prev_sibling_or_token(), end.next_sibling_or_token()));
if let Some(res) = eat_matching_parens(&a, &b) {
// println!("ate parens!");
(begin, end) = res;
} else {
break
}
}
(begin, end)
}
fn remove_node(node: &rnix::SyntaxNode) -> (usize, usize) {
let (before, after) = surrounding_noise(node);
let (mut prev, /*mut*/ next) =
eat_whitespace(&before, &after);
// println!("{prev:?}, {next:?}");
if let Some(t) = prev.as_token().map(|t| t.prev_token()).flatten() {
if t.kind() == rnix::SyntaxKind::TOKEN_WHITESPACE {
prev = NodeOrToken::Token(t);
}
};
// if let Some(t) = next.as_token().map(|t| t.next_token()).flatten() {
// if t.kind() == rnix::SyntaxKind::TOKEN_WHITESPACE {
// next = NodeOrToken::Token(t);
// }
// };
// println!("{prev:?}, {next:?}");
if prev.kind() == rnix::SyntaxKind::TOKEN_WHITESPACE
&& next.kind() == rnix::SyntaxKind::TOKEN_WHITESPACE {
// println!("inside if!");
if prev.to_string().lines().count() < next.to_string().lines().count() {
let start: usize = (node.text_range().start() - prev.text_range().len()).into();
let end: usize = node.text_range().end().into();
(start + previous_indentation(&node).unwrap_or(0)
, end + next_indentation(&node).unwrap_or(0))
} else {
let start: usize = node.text_range().start().into();
let end: usize = (node.text_range().end() + next.text_range().len()).into();
(start, end)
// (start - previous_indentation(&node).unwrap_or(0),
// end - next_indentation(&node).unwrap_or(0))
}
}
else {
(prev.text_range().start().into(), next.text_range().end().into())
}
}
fn indentation_of_string(string: &str) -> Option<usize> {
if string.contains("\n") {
None
} else {
Some(string.lines().last().unwrap().len())
}
}
fn previous_indentation(node: &rnix::SyntaxNode) -> Option<usize> {
let whitespace_token = node.prev_sibling_or_token()?;
if whitespace_token.kind() == rnix::SyntaxKind::TOKEN_WHITESPACE {
indentation_of_string(&whitespace_token.to_string())
} else {
None
}
}
fn next_indentation(node: &rnix::SyntaxNode) -> Option<usize> {
let whitespace_token = node.next_sibling_or_token()?;
if whitespace_token.kind() == rnix::SyntaxKind::TOKEN_WHITESPACE {
indentation_of_string(&whitespace_token.to_string())
// Some(whitespace_token.to_string().lines().last().unwrap().len())
} else {
None
}
}
/// give line & column of a position marker in the given string
fn line_at_textpos(content: &str, pos: rowan::TextSize) -> Option<(usize, usize)> {
let pos: usize = pos.into();
content
.split("\n")
.scan(0usize, |acc,line| {
let start = *acc;
let end = line.len() + 1 + start;
*acc = end;
Some((start, end))
})
.enumerate()
.find(|(_, (_, end))| *end > pos)
.map(|(line, (start, _))| (line + 1, pos + 1 - start))
}
pub fn format_pos(path: &PathBuf, content: &str, pos1: rowan::TextSize) -> String {
let (line1, col1) = line_at_textpos(content, pos1).unwrap();
format!("{path:?}:{line1}:{col1}")
}
pub fn format_range(path: &PathBuf, content: &str, range: rowan::TextRange) -> String {
let (line1, col1) = line_at_textpos(content, range.start()).unwrap();
let (line2, col2) = line_at_textpos(content, range.end()).unwrap();
format!("{}:{line1}:{col1}-{line2}:{col2}", path.to_string_lossy())
}
pub fn format_range_json(path: &PathBuf, content: &str, range: rowan::TextRange) -> serde_json::Value {
let (line1, col1) = line_at_textpos(content, range.start()).unwrap();
let (line2, col2) = line_at_textpos(content, range.end()).unwrap();
serde_json::json!({
"file": path,
"start": {
"line": line1,
"column": col1
},
"end": {
"line": line2,
"column": col2
}
})
}
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