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Make better use of stdx::always

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This commit is contained in:
Jonas Schievink 2021-04-07 16:44:25 +02:00
parent 3f599ae4ed
commit 39d59fb06f
1 changed files with 21 additions and 7 deletions
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28
crates/ide/src/typing.rs
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@ -58,9 +58,13 @@ pub(crate) fn on_char_typed(
position: FilePosition,
char_typed: char,
) -> Option<SourceChange> {
assert!(TRIGGER_CHARS.contains(char_typed));
if !stdx::always!(TRIGGER_CHARS.contains(char_typed)) {
return None;
}
let file = &db.parse(position.file_id);
assert_eq!(file.tree().syntax().text().char_at(position.offset), Some(char_typed));
if !stdx::always!(file.tree().syntax().text().char_at(position.offset) == Some(char_typed)) {
return None;
}
let edit = on_char_typed_inner(file, position.offset, char_typed)?;
Some(SourceChange::from_text_edit(position.file_id, edit))
}
@ -70,7 +74,9 @@ fn on_char_typed_inner(
offset: TextSize,
char_typed: char,
) -> Option<TextEdit> {
assert!(TRIGGER_CHARS.contains(char_typed));
if !stdx::always!(TRIGGER_CHARS.contains(char_typed)) {
return None;
}
match char_typed {
'.' => on_dot_typed(&file.tree(), offset),
'=' => on_eq_typed(&file.tree(), offset),
@ -83,7 +89,9 @@ fn on_char_typed_inner(
/// Inserts a closing `}` when the user types an opening `{`, wrapping an existing expression in a
/// block.
fn on_opening_brace_typed(file: &Parse<SourceFile>, offset: TextSize) -> Option<TextEdit> {
stdx::always!(file.tree().syntax().text().char_at(offset) == Some('{'));
if !stdx::always!(file.tree().syntax().text().char_at(offset) == Some('{')) {
return None;
}
let brace_token = file.tree().syntax().token_at_offset(offset).right_biased()?;
@ -120,7 +128,9 @@ fn on_opening_brace_typed(file: &Parse<SourceFile>, offset: TextSize) -> Option<
/// this works when adding `let =`.
// FIXME: use a snippet completion instead of this hack here.
fn on_eq_typed(file: &SourceFile, offset: TextSize) -> Option<TextEdit> {
stdx::always!(file.syntax().text().char_at(offset) == Some('='));
if !stdx::always!(file.syntax().text().char_at(offset) == Some('=')) {
return None;
}
let let_stmt: ast::LetStmt = find_node_at_offset(file.syntax(), offset)?;
if let_stmt.semicolon_token().is_some() {
return None;
@ -142,7 +152,9 @@ fn on_eq_typed(file: &SourceFile, offset: TextSize) -> Option<TextEdit> {
/// Returns an edit which should be applied when a dot ('.') is typed on a blank line, indenting the line appropriately.
fn on_dot_typed(file: &SourceFile, offset: TextSize) -> Option<TextEdit> {
stdx::always!(file.syntax().text().char_at(offset) == Some('.'));
if !stdx::always!(file.syntax().text().char_at(offset) == Some('.')) {
return None;
}
let whitespace =
file.syntax().token_at_offset(offset).left_biased().and_then(ast::Whitespace::cast)?;
@ -171,7 +183,9 @@ fn on_dot_typed(file: &SourceFile, offset: TextSize) -> Option<TextEdit> {
/// Adds a space after an arrow when `fn foo() { ... }` is turned into `fn foo() -> { ... }`
fn on_arrow_typed(file: &SourceFile, offset: TextSize) -> Option<TextEdit> {
let file_text = file.syntax().text();
stdx::always!(file_text.char_at(offset) == Some('>'));
if !stdx::always!(file_text.char_at(offset) == Some('>')) {
return None;
}
let after_arrow = offset + TextSize::of('>');
if file_text.char_at(after_arrow) != Some('{') {
return None;