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|
use std::mem;
use libsyntax2::{
TextUnit, TextRange, SyntaxNodeRef, File, AstNode,
ast,
algo::{
walk::preorder,
find_covering_node,
},
text_utils::intersect,
SyntaxKind::*,
};
use {ActionResult, EditBuilder};
pub fn join_lines(file: &File, range: TextRange) -> ActionResult {
let range = if range.is_empty() {
let text = file.syntax().text();
let text = &text[TextRange::from_to(range.start(), TextUnit::of_str(&text))];
let pos = text.bytes().take_while(|&b| b != b'\n').count();
if pos == text.len() {
return ActionResult {
edit: EditBuilder::new().finish(),
cursor_position: None
};
}
let pos: TextUnit = (pos as u32).into();
TextRange::offset_len(
range.start() + pos,
TextUnit::of_char('\n'),
)
} else {
range
};
let node = find_covering_node(file.syntax(), range);
let mut edit = EditBuilder::new();
for node in preorder(node) {
let text = match node.leaf_text() {
Some(text) => text,
None => continue,
};
let range = match intersect(range, node.range()) {
Some(range) => range,
None => continue,
} - node.range().start();
for (pos, _) in text[range].bytes().enumerate().filter(|&(_, b)| b == b'\n') {
let pos: TextUnit = (pos as u32).into();
let off = node.range().start() + range.start() + pos;
remove_newline(&mut edit, node, text.as_str(), off);
}
}
ActionResult {
edit: edit.finish(),
cursor_position: None,
}
}
fn remove_newline(
edit: &mut EditBuilder,
node: SyntaxNodeRef,
node_text: &str,
offset: TextUnit,
) {
if node.kind() == WHITESPACE && node_text.bytes().filter(|&b| b == b'\n').count() == 1 {
if join_lambda_body(edit, node).is_some() {
return
}
match (node.prev_sibling(), node.next_sibling()) {
(Some(prev), Some(next)) => {
let range = TextRange::from_to(prev.range().start(), node.range().end());
if prev.kind() == COMMA && (next.kind() == R_PAREN || next.kind() == R_BRACK) {
edit.delete(range);
} else if prev.kind() == COMMA && next.kind() == R_CURLY {
edit.replace(range, " ".to_string());
} else {
edit.replace(
node.range(),
compute_ws(prev, next).to_string(),
);
}
return;
}
_ => (),
}
}
let suff = &node_text[TextRange::from_to(
offset - node.range().start() + TextUnit::of_char('\n'),
TextUnit::of_str(node_text),
)];
let spaces = suff.bytes().take_while(|&b| b == b' ').count();
edit.replace(
TextRange::offset_len(offset, ((spaces + 1) as u32).into()),
" ".to_string(),
);
}
fn join_lambda_body(
edit: &mut EditBuilder,
node: SyntaxNodeRef,
) -> Option<()> {
let block = ast::Block::cast(node.parent()?)?;
let block_expr = ast::BlockExpr::cast(block.syntax().parent()?)?;
let _lambda = ast::LambdaExpr::cast(block_expr.syntax().parent()?)?;
let expr = single_expr(block)?;
edit.replace(
block_expr.syntax().range(),
expr.syntax().text(),
);
Some(())
}
fn single_expr(block: ast::Block) -> Option<ast::Expr> {
let mut res = None;
for child in block.syntax().children() {
if let Some(expr) = ast::Expr::cast(child) {
if expr.syntax().text().contains('\n') {
return None;
}
if mem::replace(&mut res, Some(expr)).is_some() {
return None;
}
} else {
match child.kind() {
WHITESPACE | L_CURLY | R_CURLY => (),
_ => return None,
}
}
}
res
}
fn compute_ws(left: SyntaxNodeRef, right: SyntaxNodeRef) -> &'static str {
match left.kind() {
L_PAREN | L_BRACK => return "",
_ => (),
}
match right.kind() {
R_PAREN | R_BRACK => return "",
_ => (),
}
" "
}
|
