2018-08-07 17:28:30 +02:00
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use libsyntax2::{
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2018-08-31 13:52:29 +02:00
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File, TextRange, SyntaxNodeRef, TextUnit,
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2018-08-26 09:43:03 +02:00
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SyntaxKind::*,
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algo::{find_leaf_at_offset, find_covering_node, ancestors, Direction, siblings},
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2018-08-07 17:28:30 +02:00
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};
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2018-08-25 10:44:58 +02:00
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pub fn extend_selection(file: &File, range: TextRange) -> Option<TextRange> {
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2018-08-11 11:28:59 +02:00
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let syntax = file.syntax();
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2018-08-17 21:03:55 +02:00
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extend(syntax.borrowed(), range)
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2018-08-11 11:28:59 +02:00
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}
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2018-08-07 17:28:30 +02:00
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2018-08-11 11:28:59 +02:00
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pub(crate) fn extend(root: SyntaxNodeRef, range: TextRange) -> Option<TextRange> {
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2018-08-07 17:28:30 +02:00
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if range.is_empty() {
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let offset = range.start();
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let mut leaves = find_leaf_at_offset(root, offset);
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if let Some(leaf) = leaves.clone().find(|node| node.kind() != WHITESPACE) {
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return Some(leaf.range());
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}
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let ws = leaves.next()?;
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2018-08-22 10:56:36 +02:00
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let ws_text = ws.leaf_text().unwrap();
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2018-08-31 13:52:29 +02:00
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let suffix = TextRange::from_to(offset, ws.range().end()) - ws.range().start();
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let prefix = TextRange::from_to(ws.range().start(), offset) - ws.range().start();
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let ws_suffix = &ws_text.as_str()[suffix];
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let ws_prefix = &ws_text.as_str()[prefix];
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2018-08-22 10:56:36 +02:00
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if ws_text.contains("\n") && !ws_suffix.contains("\n") {
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if let Some(node) = ws.next_sibling() {
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2018-08-31 13:52:29 +02:00
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let start = match ws_prefix.rfind('\n') {
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Some(idx) => ws.range().start() + TextUnit::from((idx + 1) as u32),
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None => node.range().start()
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};
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let end = if root.text().char_at(node.range().end()) == Some('\n') {
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node.range().end() + TextUnit::of_char('\n')
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} else {
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node.range().end()
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};
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return Some(TextRange::from_to(start, end));
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2018-08-22 10:56:36 +02:00
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}
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}
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2018-08-07 17:28:30 +02:00
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return Some(ws.range());
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};
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let node = find_covering_node(root, range);
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2018-08-26 09:43:03 +02:00
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if node.kind() == COMMENT && range == node.range() {
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if let Some(range) = extend_comments(node) {
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return Some(range);
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}
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}
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2018-08-07 17:28:30 +02:00
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match ancestors(node).skip_while(|n| n.range() == range).next() {
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None => None,
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Some(parent) => Some(parent.range()),
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}
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}
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2018-08-26 09:43:03 +02:00
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fn extend_comments(node: SyntaxNodeRef) -> Option<TextRange> {
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let left = adj_comments(node, Direction::Backward);
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let right = adj_comments(node, Direction::Forward);
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if left != right {
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Some(TextRange::from_to(
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left.range().start(),
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right.range().end(),
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))
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} else {
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None
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}
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}
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fn adj_comments(node: SyntaxNodeRef, dir: Direction) -> SyntaxNodeRef {
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let mut res = node;
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for node in siblings(node, dir) {
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match node.kind() {
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COMMENT => res = node,
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WHITESPACE if !node.leaf_text().unwrap().as_str().contains("\n\n") => (),
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_ => break
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}
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}
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res
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}
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2018-08-28 13:47:12 +02:00
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#[cfg(test)]
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mod tests {
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use super::*;
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use test_utils::extract_offset;
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fn do_check(before: &str, afters: &[&str]) {
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let (cursor, before) = extract_offset(before);
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let file = File::parse(&before);
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let mut range = TextRange::offset_len(cursor, 0.into());
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for &after in afters {
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range = extend_selection(&file, range)
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.unwrap();
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let actual = &before[range];
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assert_eq!(after, actual);
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}
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}
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#[test]
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fn test_extend_selection_arith() {
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do_check(
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r#"fn foo() { <|>1 + 1 }"#,
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&["1", "1 + 1", "{ 1 + 1 }"],
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);
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}
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#[test]
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fn test_extend_selection_start_of_the_lind() {
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do_check(
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r#"
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impl S {
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<|> fn foo() {
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}
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}"#,
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2018-08-31 13:52:29 +02:00
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&[" fn foo() {\n\n }\n"]
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2018-08-28 13:47:12 +02:00
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);
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}
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#[test]
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fn test_extend_selection_comments() {
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do_check(
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r#"
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fn bar(){}
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// fn foo() {
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// 1 + <|>1
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// }
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// fn foo(){}
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"#,
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&["// 1 + 1", "// fn foo() {\n// 1 + 1\n// }"]
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);
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}
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}
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