use std::cmp::min;
use config::lists::*;
-use syntax::codemap::{BytePos, CodeMap, Span};
use syntax::parse::token::DelimToken;
+use syntax::source_map::{BytePos, SourceMap, Span};
use syntax::{ast, ptr};
use chains::rewrite_chain;
use closures;
-use codemap::{LineRangeUtils, SpanUtils};
use comment::{
combine_strs_with_missing_comments, contains_comment, recover_comment_removed, rewrite_comment,
rewrite_missing_comment, CharClasses, FindUncommented,
definitive_tactic, itemize_list, shape_for_tactic, struct_lit_formatting, struct_lit_shape,
struct_lit_tactic, write_list, ListFormatting, ListItem, Separator,
};
-use macros::{rewrite_macro, MacroArg, MacroPosition};
+use macros::{rewrite_macro, MacroPosition};
use matches::rewrite_match;
-use overflow;
-use patterns::{can_be_overflowed_pat, is_short_pattern, TuplePatField};
+use overflow::{self, IntoOverflowableItem, OverflowableItem};
+use pairs::{rewrite_all_pairs, rewrite_pair, PairParts};
+use patterns::is_short_pattern;
use rewrite::{Rewrite, RewriteContext};
use shape::{Indent, Shape};
+use source_map::{LineRangeUtils, SpanUtils};
use spanned::Spanned;
use string::{rewrite_string, StringFormat};
-use types::{can_be_overflowed_type, rewrite_path, PathContext};
+use types::{rewrite_path, PathContext};
use utils::{
- colon_spaces, contains_skip, count_newlines, first_line_width, inner_attributes,
+ 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,
};
let expr_rw = match expr.node {
ast::ExprKind::Array(ref expr_vec) => rewrite_array(
"",
- &ptr_vec_to_ref_vec(expr_vec),
+ expr_vec.iter(),
expr.span,
context,
shape,
ast::ExprKind::Paren(ref subexpr) => rewrite_paren(context, subexpr, shape, expr.span),
ast::ExprKind::Binary(op, ref lhs, ref rhs) => {
// FIXME: format comments between operands and operator
- rewrite_simple_binaries(context, expr, shape, op).or_else(|| {
+ rewrite_all_pairs(expr, shape, context).or_else(|| {
rewrite_pair(
&**lhs,
&**rhs,
- PairParts::new("", &format!(" {} ", context.snippet(op.span)), ""),
+ PairParts::infix(&format!(" {} ", context.snippet(op.span))),
context,
shape,
context.config.binop_separator(),
)
})
}
- ast::ExprKind::Unary(ref op, ref subexpr) => rewrite_unary_op(context, op, subexpr, shape),
+ ast::ExprKind::Unary(op, ref subexpr) => rewrite_unary_op(context, op, subexpr, shape),
ast::ExprKind::Struct(ref path, ref fields, ref base) => rewrite_struct_lit(
context,
path,
shape,
),
ast::ExprKind::Tup(ref items) => {
- rewrite_tuple(context, &ptr_vec_to_ref_vec(items), expr.span, shape)
+ rewrite_tuple(context, items.iter(), expr.span, shape, items.len() == 1)
}
ast::ExprKind::If(..)
| ast::ExprKind::IfLet(..)
Some(format!("break{}", id_str))
}
}
- ast::ExprKind::Yield(ref opt_expr) => if let Some(ref expr) = *opt_expr {
- rewrite_unary_prefix(context, "yield ", &**expr, shape)
- } else {
- Some("yield".to_string())
- },
- ast::ExprKind::Closure(capture, movability, ref fn_decl, ref body, _) => {
+ ast::ExprKind::Yield(ref opt_expr) => {
+ if let Some(ref expr) = *opt_expr {
+ rewrite_unary_prefix(context, "yield ", &**expr, shape)
+ } else {
+ Some("yield".to_string())
+ }
+ }
+ ast::ExprKind::Closure(capture, asyncness, movability, ref fn_decl, ref body, _) => {
closures::rewrite_closure(
- capture, movability, fn_decl, body, expr.span, context, shape,
+ capture, asyncness, movability, fn_decl, body, expr.span, context, shape,
)
}
ast::ExprKind::Try(..) | ast::ExprKind::Field(..) | ast::ExprKind::MethodCall(..) => {
ast::ExprKind::Cast(ref expr, ref ty) => rewrite_pair(
&**expr,
&**ty,
- PairParts::new("", " as ", ""),
+ PairParts::infix(" as "),
context,
shape,
SeparatorPlace::Front,
ast::ExprKind::Type(ref expr, ref ty) => rewrite_pair(
&**expr,
&**ty,
- PairParts::new("", ": ", ""),
+ PairParts::infix(": "),
context,
shape,
SeparatorPlace::Back,
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))),
)
};
rewrite_pair(
&*lhs,
&*rhs,
- PairParts::new("", &sp_delim, ""),
+ PairParts::infix(&sp_delim),
context,
shape,
context.config.binop_separator(),
// We do not format these expressions yet, but they should still
// satisfy our width restrictions.
ast::ExprKind::InlineAsm(..) => Some(context.snippet(expr.span).to_owned()),
- ast::ExprKind::Catch(ref block) => {
+ ast::ExprKind::TryBlock(ref block) => {
+ if let rw @ Some(_) =
+ rewrite_single_line_block(context, "try ", block, Some(&expr.attrs), None, shape)
+ {
+ rw
+ } else {
+ // 9 = `try `
+ let budget = shape.width.saturating_sub(9);
+ Some(format!(
+ "{}{}",
+ "try ",
+ rewrite_block(
+ block,
+ Some(&expr.attrs),
+ None,
+ context,
+ Shape::legacy(budget, shape.indent)
+ )?
+ ))
+ }
+ }
+ ast::ExprKind::ObsoleteInPlace(ref lhs, ref rhs) => lhs
+ .rewrite(context, shape)
+ .map(|s| s + " <-")
+ .and_then(|lhs| rewrite_assign_rhs(context, lhs, &**rhs, shape)),
+ ast::ExprKind::Async(capture_by, _node_id, ref block) => {
+ let mover = if capture_by == ast::CaptureBy::Value {
+ "move "
+ } else {
+ ""
+ };
if let rw @ Some(_) = rewrite_single_line_block(
context,
- "do catch ",
+ format!("{}{}", "async ", mover).as_str(),
block,
Some(&expr.attrs),
None,
) {
rw
} else {
- // 9 = `do catch `
- let budget = shape.width.saturating_sub(9);
+ // 6 = `async `
+ let budget = shape.width.saturating_sub(6);
Some(format!(
- "{}{}",
- "do catch ",
+ "{}{}{}",
+ "async ",
+ mover,
rewrite_block(
block,
Some(&expr.attrs),
))
}
}
- // FIXME(#2743)
- ast::ExprKind::ObsoleteInPlace(..) => unimplemented!(),
};
expr_rw
})
}
-/// Collect operands that appears in the given binary operator in the opposite order.
-/// e.g. `collect_binary_items(e, ||)` for `a && b || c || d` returns `[d, c, a && b]`.
-fn collect_binary_items<'a>(mut expr: &'a ast::Expr, binop: ast::BinOp) -> Vec<&'a ast::Expr> {
- let mut result = vec![];
- let mut prev_lhs = None;
- loop {
- match expr.node {
- ast::ExprKind::Binary(inner_binop, ref lhs, ref rhs)
- if inner_binop.node == binop.node =>
- {
- result.push(&**rhs);
- expr = lhs;
- prev_lhs = Some(lhs);
- }
- _ => {
- if let Some(lhs) = prev_lhs {
- result.push(lhs);
- }
- break;
- }
- }
- }
- result
-}
-
-/// Rewrites a binary expression whose operands fits within a single line.
-fn rewrite_simple_binaries(
- context: &RewriteContext,
- expr: &ast::Expr,
- shape: Shape,
- op: ast::BinOp,
-) -> Option<String> {
- let op_str = context.snippet(op.span);
-
- // 2 = spaces around a binary operator.
- let sep_overhead = op_str.len() + 2;
- let nested_overhead = sep_overhead - 1;
-
- let nested_shape = (match context.config.indent_style() {
- IndentStyle::Visual => shape.visual_indent(0),
- IndentStyle::Block => shape.block_indent(context.config.tab_spaces()),
- }).with_max_width(context.config);
- let nested_shape = match context.config.binop_separator() {
- SeparatorPlace::Back => nested_shape.sub_width(nested_overhead)?,
- SeparatorPlace::Front => nested_shape.offset_left(nested_overhead)?,
- };
-
- let opt_rewrites: Option<Vec<_>> = collect_binary_items(expr, op)
- .iter()
- .rev()
- .map(|e| e.rewrite(context, nested_shape))
- .collect();
- if let Some(rewrites) = opt_rewrites {
- if rewrites.iter().all(|e| ::utils::is_single_line(e)) {
- let total_width = rewrites.iter().map(|s| s.len()).sum::<usize>()
- + sep_overhead * (rewrites.len() - 1);
-
- let sep_str = if total_width <= shape.width {
- format!(" {} ", op_str)
- } else {
- let indent_str = nested_shape.indent.to_string_with_newline(context.config);
- match context.config.binop_separator() {
- SeparatorPlace::Back => format!(" {}{}", op_str.trim_right(), indent_str),
- SeparatorPlace::Front => format!("{}{} ", indent_str, op_str.trim_left()),
- }
- };
-
- return wrap_str(rewrites.join(&sep_str), context.config.max_width(), shape);
- }
- }
-
- None
-}
-
-#[derive(new, Clone, Copy)]
-pub struct PairParts<'a> {
- prefix: &'a str,
- infix: &'a str,
- suffix: &'a str,
-}
-
-pub fn rewrite_pair<LHS, RHS>(
- lhs: &LHS,
- rhs: &RHS,
- pp: PairParts,
- context: &RewriteContext,
- shape: Shape,
- separator_place: SeparatorPlace,
-) -> Option<String>
-where
- LHS: Rewrite,
- RHS: Rewrite,
-{
- let lhs_overhead = match separator_place {
- SeparatorPlace::Back => shape.used_width() + pp.prefix.len() + pp.infix.trim_right().len(),
- SeparatorPlace::Front => shape.used_width(),
- };
- let lhs_shape = Shape {
- width: context.budget(lhs_overhead),
- ..shape
- };
- let lhs_result = lhs
- .rewrite(context, lhs_shape)
- .map(|lhs_str| format!("{}{}", pp.prefix, lhs_str))?;
-
- // Try to put both lhs and rhs on the same line.
- let rhs_orig_result = shape
- .offset_left(last_line_width(&lhs_result) + pp.infix.len())
- .and_then(|s| s.sub_width(pp.suffix.len()))
- .and_then(|rhs_shape| rhs.rewrite(context, rhs_shape));
- if let Some(ref rhs_result) = rhs_orig_result {
- // If the length of the lhs is equal to or shorter than the tab width or
- // the rhs looks like block expression, we put the rhs on the same
- // line with the lhs even if the rhs is multi-lined.
- let allow_same_line = lhs_result.len() <= context.config.tab_spaces()
- || rhs_result
- .lines()
- .next()
- .map(|first_line| first_line.ends_with('{'))
- .unwrap_or(false);
- if !rhs_result.contains('\n') || allow_same_line {
- let one_line_width = last_line_width(&lhs_result)
- + pp.infix.len()
- + first_line_width(rhs_result)
- + pp.suffix.len();
- if one_line_width <= shape.width {
- return Some(format!(
- "{}{}{}{}",
- lhs_result, pp.infix, rhs_result, pp.suffix
- ));
- }
- }
- }
-
- // We have to use multiple lines.
- // Re-evaluate the rhs because we have more space now:
- let mut rhs_shape = match context.config.indent_style() {
- IndentStyle::Visual => shape
- .sub_width(pp.suffix.len() + pp.prefix.len())?
- .visual_indent(pp.prefix.len()),
- IndentStyle::Block => {
- // Try to calculate the initial constraint on the right hand side.
- let rhs_overhead = shape.rhs_overhead(context.config);
- Shape::indented(shape.indent.block_indent(context.config), context.config)
- .sub_width(rhs_overhead)?
- }
- };
- let infix = match separator_place {
- SeparatorPlace::Back => pp.infix.trim_right(),
- SeparatorPlace::Front => pp.infix.trim_left(),
- };
- if separator_place == SeparatorPlace::Front {
- rhs_shape = rhs_shape.offset_left(infix.len())?;
- }
- let rhs_result = rhs.rewrite(context, rhs_shape)?;
- let indent_str = rhs_shape.indent.to_string_with_newline(context.config);
- let infix_with_sep = match separator_place {
- SeparatorPlace::Back => format!("{}{}", infix, indent_str),
- SeparatorPlace::Front => format!("{}{}", indent_str, infix),
- };
- Some(format!(
- "{}{}{}{}",
- lhs_result, infix_with_sep, rhs_result, pp.suffix
- ))
-}
-
-pub fn rewrite_array<T: Rewrite + Spanned + ToExpr>(
- name: &str,
- exprs: &[&T],
+pub fn rewrite_array<'a, T: 'a + IntoOverflowableItem<'a>>(
+ name: &'a str,
+ exprs: impl Iterator<Item = &'a T>,
span: Span,
- context: &RewriteContext,
+ context: &'a RewriteContext,
shape: Shape,
force_separator_tactic: Option<SeparatorTactic>,
delim_token: Option<DelimToken>,
return None;
}
- if block.stmts.is_empty() && !block_contains_comment(block, context.codemap) && shape.width >= 2
+ if block.stmts.is_empty()
+ && !block_contains_comment(block, context.source_map)
+ && shape.width >= 2
{
return Some(format!("{}{}{{}}", prefix, label_str));
}
label: Option<ast::Label>,
shape: Shape,
) -> Option<String> {
- if is_simple_block(block, attrs, context.codemap) {
+ if is_simple_block(block, attrs, context.source_map) {
let expr_shape = shape.offset_left(last_line_width(prefix))?;
let expr_str = block.stmts[0].rewrite(context, expr_shape)?;
let label_str = rewrite_label(label);
let fixed_cost = self.keyword.len() + " { } else { }".len();
if let ast::ExprKind::Block(ref else_node, _) = else_block.node {
- if !is_simple_block(self.block, None, context.codemap)
- || !is_simple_block(else_node, None, context.codemap)
+ if !is_simple_block(self.block, None, context.source_map)
+ || !is_simple_block(else_node, None, context.source_map)
|| pat_expr_str.contains('\n')
{
return None;
}
}
+/// 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
&& context
.config
.width_heuristics()
- .single_line_if_else_max_width > 0
+ .single_line_if_else_max_width
+ > 0
{
let trial = self.rewrite_single_line(&pat_expr_string, context, shape.width);
false,
true,
mk_sp(else_block.span.lo(), self.span.hi()),
- ).rewrite(context, shape)
+ )
+ .rewrite(context, shape)
}
ast::ExprKind::If(ref cond, ref if_block, ref next_else_block) => {
ControlFlow::new_if(
false,
true,
mk_sp(else_block.span.lo(), self.span.hi()),
- ).rewrite(context, shape)
+ )
+ .rewrite(context, shape)
}
_ => {
last_in_chain = true;
}
}
-pub fn block_contains_comment(block: &ast::Block, codemap: &CodeMap) -> bool {
- let snippet = codemap.span_to_snippet(block.span).unwrap();
+pub fn block_contains_comment(block: &ast::Block, source_map: &SourceMap) -> bool {
+ let snippet = source_map.span_to_snippet(block.span).unwrap();
contains_comment(&snippet)
}
pub fn is_simple_block(
block: &ast::Block,
attrs: Option<&[ast::Attribute]>,
- codemap: &CodeMap,
+ source_map: &SourceMap,
) -> bool {
(block.stmts.len() == 1
&& stmt_is_expr(&block.stmts[0])
- && !block_contains_comment(block, codemap)
+ && !block_contains_comment(block, source_map)
&& attrs.map_or(true, |a| a.is_empty()))
}
pub fn is_simple_block_stmt(
block: &ast::Block,
attrs: Option<&[ast::Attribute]>,
- codemap: &CodeMap,
+ source_map: &SourceMap,
) -> bool {
block.stmts.len() <= 1
- && !block_contains_comment(block, codemap)
+ && !block_contains_comment(block, source_map)
&& attrs.map_or(true, |a| a.is_empty())
}
pub fn is_empty_block(
block: &ast::Block,
attrs: Option<&[ast::Attribute]>,
- codemap: &CodeMap,
+ source_map: &SourceMap,
) -> bool {
block.stmts.is_empty()
- && !block_contains_comment(block, codemap)
+ && !block_contains_comment(block, source_map)
&& attrs.map_or(true, |a| inner_attributes(a).is_empty())
}
shape.width,
)
};
- let fmt = ListFormatting {
- tactic,
- separator: " |",
- trailing_separator: SeparatorTactic::Never,
- separator_place: context.config.binop_separator(),
- shape,
- ends_with_newline: false,
- preserve_newline: false,
- nested: false,
- config: context.config,
- };
+ let fmt = ListFormatting::new(shape, context.config)
+ .tactic(tactic)
+ .separator(" |")
+ .separator_place(context.config.binop_separator())
+ .ends_with_newline(false);
write_list(&items, &fmt)
}
rewrite_string(
str_lit,
&StringFormat::new(shape.visual_indent(0), context.config),
- None,
+ 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<T: ToExpr>(callee_str: &str, args: &[&T]) -> 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) {
overflow::rewrite_with_parens(
context,
callee,
- &ptr_vec_to_ref_vec(args),
+ args.iter(),
shape,
span,
context.config.width_heuristics().fn_call_width,
)
}
-fn is_simple_expr(expr: &ast::Expr) -> bool {
+pub fn is_simple_expr(expr: &ast::Expr) -> bool {
match expr.node {
ast::ExprKind::Lit(..) => true,
ast::ExprKind::Path(ref qself, ref path) => qself.is_none() && path.segments.len() <= 1,
}
}
-pub fn is_every_expr_simple<T: ToExpr>(lists: &[&T]) -> bool {
- lists
- .iter()
- .all(|arg| arg.to_expr().map_or(false, is_simple_expr))
+pub fn is_every_expr_simple(lists: &[OverflowableItem]) -> bool {
+ lists.iter().all(OverflowableItem::is_simple)
}
pub fn can_be_overflowed_expr(context: &RewriteContext, expr: &ast::Expr, args_len: usize) -> bool {
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(
.offset_left(offset)
.and_then(|shape| shape.sub_width(1 + rhs_overhead))
} else {
- shape.visual_indent(offset).sub_width(offset + 1)
+ match context.config.indent_style() {
+ IndentStyle::Block => shape
+ .offset_left(offset)
+ .and_then(|shape| shape.sub_width(1)),
+ IndentStyle::Visual => shape.visual_indent(offset).sub_width(offset + 1),
+ }
};
let orig_index_rw = index_shape.and_then(|s| index.rewrite(context, s));
}
}
-fn struct_lit_can_be_aligned(fields: &[ast::Field], base: &Option<&ast::Expr>) -> bool {
+fn struct_lit_can_be_aligned(fields: &[ast::Field], base: Option<&ast::Expr>) -> bool {
if base.is_some() {
return false;
}
let one_line_width = h_shape.map_or(0, |shape| shape.width);
let body_lo = context.snippet_provider.span_after(span, "{");
- let fields_str = if struct_lit_can_be_aligned(fields, &base)
+ let fields_str = if struct_lit_can_be_aligned(fields, base)
&& context.config.struct_field_align_threshold() > 0
{
rewrite_with_alignment(
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)?
if !attrs_str.is_empty() {
attrs_str.push_str(&shape.indent.to_string_with_newline(context.config));
};
- let name = &field.ident.name.to_string();
+ let name = context.snippet(field.ident.span);
if field.is_shorthand {
- Some(attrs_str + &name)
+ Some(attrs_str + name)
} else {
let mut separator = String::from(struct_lit_field_separator(context.config));
for _ in 0..prefix_max_width.saturating_sub(name.len()) {
match expr {
Some(ref e) if e.as_str() == name && context.config.use_field_init_shorthand() => {
- Some(attrs_str + &name)
+ Some(attrs_str + name)
}
Some(e) => Some(format!("{}{}{}{}", attrs_str, name, separator, e)),
None => {
}
}
-fn rewrite_tuple_in_visual_indent_style<'a, T>(
+fn rewrite_tuple_in_visual_indent_style<'a, T: 'a + IntoOverflowableItem<'a>>(
context: &RewriteContext,
- items: &[&T],
+ mut items: impl Iterator<Item = &'a T>,
span: Span,
shape: Shape,
-) -> Option<String>
-where
- T: Rewrite + Spanned + ToExpr + 'a,
-{
- let mut items = items.iter();
+ is_singleton_tuple: bool,
+) -> Option<String> {
// In case of length 1, need a trailing comma
debug!("rewrite_tuple_in_visual_indent_style {:?}", shape);
- if items.len() == 1 {
+ if is_singleton_tuple {
// 3 = "(" + ",)"
let nested_shape = shape.sub_width(3)?.visual_indent(1);
return items
Separator::Comma,
nested_shape.width,
);
- let fmt = ListFormatting {
- tactic,
- separator: ",",
- trailing_separator: SeparatorTactic::Never,
- separator_place: SeparatorPlace::Back,
- shape,
- ends_with_newline: false,
- preserve_newline: false,
- nested: false,
- config: context.config,
- };
+ let fmt = ListFormatting::new(nested_shape, context.config)
+ .tactic(tactic)
+ .ends_with_newline(false);
let list_str = write_list(&item_vec, &fmt)?;
Some(format!("({})", list_str))
}
-pub fn rewrite_tuple<'a, T>(
- context: &RewriteContext,
- items: &[&T],
+pub fn rewrite_tuple<'a, T: 'a + IntoOverflowableItem<'a>>(
+ context: &'a RewriteContext,
+ items: impl Iterator<Item = &'a T>,
span: Span,
shape: Shape,
-) -> Option<String>
-where
- T: Rewrite + Spanned + ToExpr + 'a,
-{
+ is_singleton_tuple: bool,
+) -> Option<String> {
debug!("rewrite_tuple {:?}", shape);
if context.use_block_indent() {
// We use the same rule as function calls for rewriting tuples.
} else {
Some(SeparatorTactic::Never)
}
- } else if items.len() == 1 {
+ } else if is_singleton_tuple {
Some(SeparatorTactic::Always)
} else {
None
force_tactic,
)
} else {
- rewrite_tuple_in_visual_indent_style(context, items, span, shape)
+ rewrite_tuple_in_visual_indent_style(context, items, span, shape, is_singleton_tuple)
}
}
fn rewrite_unary_op(
context: &RewriteContext,
- op: &ast::UnOp,
+ op: ast::UnOp,
expr: &ast::Expr,
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(
}
(None, Some(ref new_rhs)) => Some(format!("{}{}", new_indent_str, new_rhs)),
(None, None) => None,
- (Some(ref orig_rhs), _) => Some(format!(" {}", orig_rhs)),
+ (Some(orig_rhs), _) => Some(format!(" {}", orig_rhs)),
}
}
}
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))
rhs_tactics == RhsTactics::ForceNextLineWithoutIndent
|| !next_line_rhs.contains('\n')
|| count_newlines(orig_rhs) > count_newlines(next_line_rhs) + 1
+ || first_line_ends_with(orig_rhs, '(') && !first_line_ends_with(next_line_rhs, '(')
+ || first_line_ends_with(orig_rhs, '{') && !first_line_ends_with(next_line_rhs, '{')
+ || first_line_ends_with(orig_rhs, '[') && !first_line_ends_with(next_line_rhs, '[')
}
fn rewrite_expr_addrof(
rewrite_unary_prefix(context, operator_str, expr, shape)
}
-pub trait ToExpr {
- fn to_expr(&self) -> Option<&ast::Expr>;
- fn can_be_overflowed(&self, context: &RewriteContext, len: usize) -> bool;
-}
-
-impl ToExpr for ast::Expr {
- fn to_expr(&self) -> Option<&ast::Expr> {
- Some(self)
- }
-
- fn can_be_overflowed(&self, context: &RewriteContext, len: usize) -> bool {
- can_be_overflowed_expr(context, self, len)
- }
-}
-
-impl ToExpr for ast::Ty {
- fn to_expr(&self) -> Option<&ast::Expr> {
- None
- }
-
- fn can_be_overflowed(&self, context: &RewriteContext, len: usize) -> bool {
- can_be_overflowed_type(context, self, len)
- }
-}
-
-impl<'a> ToExpr for TuplePatField<'a> {
- fn to_expr(&self) -> Option<&ast::Expr> {
- None
- }
-
- fn can_be_overflowed(&self, context: &RewriteContext, len: usize) -> bool {
- can_be_overflowed_pat(context, self, len)
- }
-}
-
-impl<'a> ToExpr for ast::StructField {
- fn to_expr(&self) -> Option<&ast::Expr> {
- None
- }
-
- fn can_be_overflowed(&self, _: &RewriteContext, _: usize) -> bool {
- false
- }
-}
-
-impl<'a> ToExpr for MacroArg {
- fn to_expr(&self) -> Option<&ast::Expr> {
- match *self {
- MacroArg::Expr(ref expr) => Some(expr),
- _ => None,
- }
- }
-
- fn can_be_overflowed(&self, context: &RewriteContext, len: usize) -> bool {
- match *self {
- MacroArg::Expr(ref expr) => can_be_overflowed_expr(context, expr, len),
- MacroArg::Ty(ref ty) => can_be_overflowed_type(context, ty, len),
- MacroArg::Pat(..) => false,
- MacroArg::Item(..) => len == 1,
- }
- }
-}
-
-impl ToExpr for ast::GenericParam {
- fn to_expr(&self) -> Option<&ast::Expr> {
- None
- }
-
- fn can_be_overflowed(&self, _: &RewriteContext, _: usize) -> bool {
- false
- }
-}
-
pub fn is_method_call(expr: &ast::Expr) -> bool {
match expr.node {
ast::ExprKind::MethodCall(..) => true,
_ => 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