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Use mutable syntax trees in merge_imports, split_imports

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This commit is contained in:
iDawer 2021-11-19 14:06:36 +05:00
parent 4c20d6879f
commit 601413df8f
7 changed files with 144 additions and 113 deletions
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38
crates/syntax/src/ast/edit.rs
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@ -4,48 +4,10 @@
use std::{fmt, iter, ops};
use crate::{
algo,
ast::{self, make, AstNode},
ted, AstToken, NodeOrToken, SyntaxElement, SyntaxNode, SyntaxToken,
};
impl ast::UseTree {
/// Splits off the given prefix, making it the path component of the use tree, appending the rest of the path to all UseTreeList items.
#[must_use]
pub fn split_prefix(&self, prefix: &ast::Path) -> ast::UseTree {
let suffix = if self.path().as_ref() == Some(prefix) && self.use_tree_list().is_none() {
make::path_unqualified(make::path_segment_self())
} else {
match split_path_prefix(prefix) {
Some(it) => it,
None => return self.clone(),
}
};
let use_tree = make::use_tree(
suffix,
self.use_tree_list(),
self.rename(),
self.star_token().is_some(),
);
let nested = make::use_tree_list(iter::once(use_tree));
return make::use_tree(prefix.clone(), Some(nested), None, false);
fn split_path_prefix(prefix: &ast::Path) -> Option<ast::Path> {
let parent = prefix.parent_path()?;
let segment = parent.segment()?;
if algo::has_errors(segment.syntax()) {
return None;
}
let mut res = make::path_unqualified(segment);
for p in iter::successors(parent.parent_path(), |it| it.parent_path()) {
res = make::path_qualified(res, p.segment()?);
}
Some(res)
}
}
}
#[derive(Debug, Clone, Copy)]
pub struct IndentLevel(pub u8);