use string::{rewrite_string, StringFormat};
use types::{rewrite_path, PathContext};
use utils::{
- colon_spaces, contains_skip, count_newlines, first_line_ends_with, first_line_width,
- inner_attributes, last_line_extendable, last_line_width, mk_sp, outer_attributes,
- ptr_vec_to_ref_vec, semicolon_for_stmt, wrap_str,
+ colon_spaces, contains_skip, count_newlines, first_line_ends_with, inner_attributes,
+ last_line_extendable, last_line_width, mk_sp, outer_attributes, ptr_vec_to_ref_vec,
+ semicolon_for_stmt, wrap_str,
};
use vertical::rewrite_with_alignment;
use visitor::FmtVisitor;
format!(
"{}{}{}",
- lhs.map(|lhs| space_if(needs_space_before_range(context, lhs)))
- .unwrap_or(""),
+ lhs.map_or("", |lhs| space_if(needs_space_before_range(context, lhs))),
delim,
- rhs.map(|rhs| space_if(needs_space_after_range(rhs)))
- .unwrap_or(""),
+ rhs.map_or("", |rhs| space_if(needs_space_after_range(rhs))),
)
};
}
}
+/// Returns true if the last line of pat_str has leading whitespace and it is wider than the
+/// shape's indent.
+fn last_line_offsetted(start_column: usize, pat_str: &str) -> bool {
+ let mut leading_whitespaces = 0;
+ for c in pat_str.chars().rev() {
+ match c {
+ '\n' => break,
+ _ if c.is_whitespace() => leading_whitespaces += 1,
+ _ => leading_whitespaces = 0,
+ }
+ }
+ leading_whitespaces > start_column
+}
+
impl<'a> ControlFlow<'a> {
fn rewrite_pat_expr(
&self,
.saturating_sub(constr_shape.used_width() + offset + brace_overhead);
let force_newline_brace = (pat_expr_string.contains('\n')
|| pat_expr_string.len() > one_line_budget)
- && !last_line_extendable(&pat_expr_string);
+ && (!last_line_extendable(&pat_expr_string)
+ || last_line_offsetted(shape.used_width(), &pat_expr_string));
// Try to format if-else on single line.
if self.allow_single_line
let trial = self.rewrite_single_line(&pat_expr_string, context, shape.width);
if let Some(cond_str) = trial {
- if cond_str.len() <= context
- .config
- .width_heuristics()
- .single_line_if_else_max_width
+ if cond_str.len()
+ <= context
+ .config
+ .width_heuristics()
+ .single_line_if_else_max_width
{
return Some((cond_str, 0));
}
rewrite_string(
str_lit,
&StringFormat::new(shape.visual_indent(0), context.config),
+ shape.width.saturating_sub(2),
)
}
-/// In case special-case style is required, returns an offset from which we start horizontal layout.
-pub fn maybe_get_args_offset(callee_str: &str, args: &[OverflowableItem]) -> Option<(bool, usize)> {
- if let Some(&(_, num_args_before)) = SPECIAL_MACRO_WHITELIST
- .iter()
- .find(|&&(s, _)| s == callee_str)
- {
- let all_simple = args.len() > num_args_before && is_every_expr_simple(args);
-
- Some((all_simple, num_args_before))
- } else {
- None
- }
-}
-
-/// A list of `format!`-like macros, that take a long format string and a list of arguments to
-/// format.
-///
-/// Organized as a list of `(&str, usize)` tuples, giving the name of the macro and the number of
-/// arguments before the format string (none for `format!("format", ...)`, one for `assert!(result,
-/// "format", ...)`, two for `assert_eq!(left, right, "format", ...)`).
-const SPECIAL_MACRO_WHITELIST: &[(&str, usize)] = &[
- // format! like macros
- // From the Rust Standard Library.
- ("eprint!", 0),
- ("eprintln!", 0),
- ("format!", 0),
- ("format_args!", 0),
- ("print!", 0),
- ("println!", 0),
- ("panic!", 0),
- ("unreachable!", 0),
- // From the `log` crate.
- ("debug!", 0),
- ("error!", 0),
- ("info!", 0),
- ("warn!", 0),
- // write! like macros
- ("assert!", 1),
- ("debug_assert!", 1),
- ("write!", 1),
- ("writeln!", 1),
- // assert_eq! like macros
- ("assert_eq!", 2),
- ("assert_ne!", 2),
- ("debug_assert_eq!", 2),
- ("debug_assert_ne!", 2),
-];
-
fn choose_separator_tactic(context: &RewriteContext, span: Span) -> Option<SeparatorTactic> {
if context.inside_macro() {
if span_ends_with_comma(context, span) {
context.config.combine_control_expr() && context.use_block_indent() && args_len == 1
}
ast::ExprKind::Block(..) | ast::ExprKind::Closure(..) => {
- context.use_block_indent()
- || context.config.indent_style() == IndentStyle::Visual && args_len > 1
+ context.use_block_indent() || context.config.indent_style() == IndentStyle::Visual
}
ast::ExprKind::Array(..)
| ast::ExprKind::Call(..)
debug!("rewrite_paren, shape: {:?}", shape);
// Extract comments within parens.
+ let mut pre_span;
+ let mut post_span;
let mut pre_comment;
let mut post_comment;
let remove_nested_parens = context.config.remove_nested_parens();
loop {
// 1 = "(" or ")"
- let pre_span = mk_sp(span.lo() + BytePos(1), subexpr.span.lo());
- let post_span = mk_sp(subexpr.span.hi(), span.hi() - BytePos(1));
+ pre_span = mk_sp(span.lo() + BytePos(1), subexpr.span.lo());
+ post_span = mk_sp(subexpr.span.hi(), span.hi() - BytePos(1));
pre_comment = rewrite_missing_comment(pre_span, shape, context)?;
post_comment = rewrite_missing_comment(post_span, shape, context)?;
break;
}
- // 1 `(`
- let sub_shape = shape.offset_left(1).and_then(|s| s.sub_width(1))?;
-
+ // 1 = `(` and `)`
+ let sub_shape = shape.offset_left(1)?.sub_width(1)?;
let subexpr_str = subexpr.rewrite(context, sub_shape)?;
- debug!("rewrite_paren, subexpr_str: `{:?}`", subexpr_str);
-
- // 2 = `()`
- if subexpr_str.contains('\n') || first_line_width(&subexpr_str) + 2 <= shape.width {
+ let fits_single_line = !pre_comment.contains("//") && !post_comment.contains("//");
+ if fits_single_line {
Some(format!("({}{}{})", pre_comment, &subexpr_str, post_comment))
} else {
- None
+ rewrite_paren_in_multi_line(context, subexpr, shape, pre_span, post_span)
}
}
+fn rewrite_paren_in_multi_line(
+ context: &RewriteContext,
+ subexpr: &ast::Expr,
+ shape: Shape,
+ pre_span: Span,
+ post_span: Span,
+) -> Option<String> {
+ let nested_indent = shape.indent.block_indent(context.config);
+ let nested_shape = Shape::indented(nested_indent, context.config);
+ let pre_comment = rewrite_missing_comment(pre_span, nested_shape, context)?;
+ let post_comment = rewrite_missing_comment(post_span, nested_shape, context)?;
+ let subexpr_str = subexpr.rewrite(context, nested_shape)?;
+
+ let mut result = String::with_capacity(subexpr_str.len() * 2);
+ result.push('(');
+ if !pre_comment.is_empty() {
+ result.push_str(&nested_indent.to_string_with_newline(context.config));
+ result.push_str(&pre_comment);
+ }
+ result.push_str(&nested_indent.to_string_with_newline(context.config));
+ result.push_str(&subexpr_str);
+ if !post_comment.is_empty() {
+ result.push_str(&nested_indent.to_string_with_newline(context.config));
+ result.push_str(&post_comment);
+ }
+ result.push_str(&shape.indent.to_string_with_newline(context.config));
+ result.push(')');
+
+ Some(result)
+}
+
fn rewrite_index(
expr: &ast::Expr,
index: &ast::Expr,
nested_shape,
tactic,
context,
- force_no_trailing_comma || base.is_some(),
+ force_no_trailing_comma || base.is_some() || !context.use_block_indent(),
);
write_list(&item_vec, &fmt)?
shape: Shape,
) -> Option<String> {
// For some reason, an UnOp is not spanned like BinOp!
- let operator_str = match op {
- ast::UnOp::Deref => "*",
- ast::UnOp::Not => "!",
- ast::UnOp::Neg => "-",
- };
- rewrite_unary_prefix(context, operator_str, expr, shape)
+ rewrite_unary_prefix(context, ast::UnOp::to_string(op), expr, shape)
}
fn rewrite_assignment(
rhs_tactic: RhsTactics,
) -> Option<Shape> {
match rhs_tactic {
- RhsTactics::ForceNextLineWithoutIndent => Some(shape.with_max_width(context.config)),
+ RhsTactics::ForceNextLineWithoutIndent => shape
+ .with_max_width(context.config)
+ .sub_width(shape.indent.width()),
RhsTactics::Default => {
Shape::indented(shape.indent.block_indent(context.config), context.config)
.sub_width(shape.rhs_overhead(context.config))
_ => false,
}
}
+
+#[cfg(test)]
+mod test {
+ use super::last_line_offsetted;
+
+ #[test]
+ fn test_last_line_offsetted() {
+ let lines = "one\n two";
+ assert_eq!(last_line_offsetted(2, lines), true);
+ assert_eq!(last_line_offsetted(4, lines), false);
+ assert_eq!(last_line_offsetted(6, lines), false);
+
+ let lines = "one two";
+ assert_eq!(last_line_offsetted(2, lines), false);
+ assert_eq!(last_line_offsetted(0, lines), false);
+
+ let lines = "\ntwo";
+ assert_eq!(last_line_offsetted(2, lines), false);
+ assert_eq!(last_line_offsetted(0, lines), false);
+
+ let lines = "one\n two three";
+ assert_eq!(last_line_offsetted(2, lines), true);
+ let lines = "one\n two three";
+ assert_eq!(last_line_offsetted(2, lines), false);
+ }
+}
projects / rust.git / blobdiff