use std::iter::ExactSizeIterator;
use std::ops::Deref;
-use rustc_ast::ast::{self, AttrVec, FnRetTy, Mutability};
-use rustc_span::{symbol::kw, symbol::Ident, BytePos, Pos, Span};
+use rustc_ast::ast::{self, FnRetTy, Mutability, Term};
+use rustc_ast::ptr;
+use rustc_span::{symbol::kw, BytePos, Pos, Span};
+use crate::comment::{combine_strs_with_missing_comments, contains_comment};
use crate::config::lists::*;
use crate::config::{IndentStyle, TypeDensity, Version};
use crate::expr::{
format_expr, rewrite_assign_rhs, rewrite_call, rewrite_tuple, rewrite_unary_prefix, ExprType,
+ RhsAssignKind,
};
-use crate::items::StructParts;
use crate::lists::{
definitive_tactic, itemize_list, write_list, ListFormatting, ListItem, Separator,
};
colon_spaces, extra_offset, first_line_width, format_extern, format_mutability,
last_line_extendable, last_line_width, mk_sp, rewrite_ident,
};
-use crate::DEFAULT_VISIBILITY;
-use crate::{
- comment::{combine_strs_with_missing_comments, contains_comment},
- items::format_struct_struct,
-};
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub(crate) enum PathContext {
pub(crate) fn rewrite_path(
context: &RewriteContext<'_>,
path_context: PathContext,
- qself: Option<&ast::QSelf>,
+ qself: &Option<ptr::P<ast::QSelf>>,
path: &ast::Path,
shape: Shape,
) -> Option<String> {
- let skip_count = qself.map_or(0, |x| x.position);
+ let skip_count = qself.as_ref().map_or(0, |x| x.position);
let mut result = if path.is_global() && qself.is_none() && path_context != PathContext::Import {
"::".to_owned()
Const(&'a ast::AnonConst),
LifeTime(&'a ast::Lifetime),
Type(&'a ast::Ty),
- Binding(&'a ast::AssocTyConstraint),
+ Binding(&'a ast::AssocConstraint),
}
impl<'a> SegmentParam<'a> {
SegmentParam::Const(const_) => const_.rewrite(context, shape),
SegmentParam::LifeTime(lt) => lt.rewrite(context, shape),
SegmentParam::Type(ty) => ty.rewrite(context, shape),
- SegmentParam::Binding(assoc_ty_constraint) => {
- let mut result = match assoc_ty_constraint.kind {
- ast::AssocTyConstraintKind::Bound { .. } => {
- format!("{}: ", rewrite_ident(context, assoc_ty_constraint.ident))
- }
- ast::AssocTyConstraintKind::Equality { .. } => {
- match context.config.type_punctuation_density() {
- TypeDensity::Wide => {
- format!("{} = ", rewrite_ident(context, assoc_ty_constraint.ident))
- }
- TypeDensity::Compressed => {
- format!("{}=", rewrite_ident(context, assoc_ty_constraint.ident))
- }
- }
- }
- };
+ SegmentParam::Binding(atc) => atc.rewrite(context, shape),
+ }
+ }
+}
- let budget = shape.width.checked_sub(result.len())?;
- let rewrite = assoc_ty_constraint
- .kind
- .rewrite(context, Shape::legacy(budget, shape.indent + result.len()))?;
- result.push_str(&rewrite);
- Some(result)
- }
+impl Rewrite for ast::AssocConstraint {
+ fn rewrite(&self, context: &RewriteContext<'_>, shape: Shape) -> Option<String> {
+ use ast::AssocConstraintKind::{Bound, Equality};
+
+ let mut result = String::with_capacity(128);
+ result.push_str(rewrite_ident(context, self.ident));
+
+ if let Some(ref gen_args) = self.gen_args {
+ let budget = shape.width.checked_sub(result.len())?;
+ let shape = Shape::legacy(budget, shape.indent + result.len());
+ let gen_str = rewrite_generic_args(gen_args, context, shape, gen_args.span())?;
+ result.push_str(&gen_str);
}
+
+ let infix = match (&self.kind, context.config.type_punctuation_density()) {
+ (Bound { .. }, _) => ": ",
+ (Equality { .. }, TypeDensity::Wide) => " = ",
+ (Equality { .. }, TypeDensity::Compressed) => "=",
+ };
+ result.push_str(infix);
+
+ let budget = shape.width.checked_sub(result.len())?;
+ let shape = Shape::legacy(budget, shape.indent + result.len());
+ let rewrite = self.kind.rewrite(context, shape)?;
+ result.push_str(&rewrite);
+
+ Some(result)
}
}
-impl Rewrite for ast::AssocTyConstraintKind {
+impl Rewrite for ast::AssocConstraintKind {
fn rewrite(&self, context: &RewriteContext<'_>, shape: Shape) -> Option<String> {
match self {
- ast::AssocTyConstraintKind::Equality { ty } => ty.rewrite(context, shape),
- ast::AssocTyConstraintKind::Bound { bounds } => bounds.rewrite(context, shape),
+ ast::AssocConstraintKind::Equality { term } => match term {
+ Term::Ty(ty) => ty.rewrite(context, shape),
+ Term::Const(c) => c.rewrite(context, shape),
+ },
+ ast::AssocConstraintKind::Bound { bounds } => bounds.rewrite(context, shape),
}
}
}
};
if let Some(ref args) = segment.args {
+ let generics_str = rewrite_generic_args(args, context, shape, mk_sp(*span_lo, span_hi))?;
match **args {
ast::GenericArgs::AngleBracketed(ref data) if !data.args.is_empty() => {
- let param_list = data
- .args
- .iter()
- .map(|x| match x {
- ast::AngleBracketedArg::Arg(generic_arg) => {
- SegmentParam::from_generic_arg(generic_arg)
- }
- ast::AngleBracketedArg::Constraint(constraint) => {
- SegmentParam::Binding(constraint)
- }
- })
- .collect::<Vec<_>>();
-
// HACK: squeeze out the span between the identifier and the parameters.
- // The hack is requried so that we don't remove the separator inside macro calls.
+ // The hack is required so that we don't remove the separator inside macro calls.
// This does not work in the presence of comment, hoping that people are
// sane about where to put their comment.
let separator_snippet = context
};
result.push_str(separator);
- let generics_str = overflow::rewrite_with_angle_brackets(
- context,
- "",
- param_list.iter(),
- shape,
- mk_sp(*span_lo, span_hi),
- )?;
-
// Update position of last bracket.
*span_lo = context
.snippet_provider
.span_after(mk_sp(*span_lo, span_hi), "<");
-
- result.push_str(&generics_str)
- }
- ast::GenericArgs::Parenthesized(ref data) => {
- result.push_str(&format_function_type(
- data.inputs.iter().map(|x| &**x),
- &data.output,
- false,
- data.span,
- context,
- shape,
- )?);
}
_ => (),
}
+ result.push_str(&generics_str)
}
Some(result)
format!("{}{}", type_str, colon)
};
- rewrite_assign_rhs(context, lhs, bounds, shape)?
+ rewrite_assign_rhs(context, lhs, bounds, &RhsAssignKind::Bounds, shape)?
}
ast::WherePredicate::RegionPredicate(ast::WhereRegionPredicate {
ref lifetime,
..
}) => {
let lhs_ty_str = lhs_ty.rewrite(context, shape).map(|lhs| lhs + " =")?;
- rewrite_assign_rhs(context, lhs_ty_str, &**rhs_ty, shape)?
+ rewrite_assign_rhs(context, lhs_ty_str, &**rhs_ty, &RhsAssignKind::Ty, shape)?
}
};
}
}
+fn rewrite_generic_args(
+ gen_args: &ast::GenericArgs,
+ context: &RewriteContext<'_>,
+ shape: Shape,
+ span: Span,
+) -> Option<String> {
+ match gen_args {
+ ast::GenericArgs::AngleBracketed(ref data) if !data.args.is_empty() => {
+ let args = data
+ .args
+ .iter()
+ .map(|x| match x {
+ ast::AngleBracketedArg::Arg(generic_arg) => {
+ SegmentParam::from_generic_arg(generic_arg)
+ }
+ ast::AngleBracketedArg::Constraint(constraint) => {
+ SegmentParam::Binding(constraint)
+ }
+ })
+ .collect::<Vec<_>>();
+
+ overflow::rewrite_with_angle_brackets(context, "", args.iter(), shape, span)
+ }
+ ast::GenericArgs::Parenthesized(ref data) => format_function_type(
+ data.inputs.iter().map(|x| &**x),
+ &data.output,
+ false,
+ data.span,
+ context,
+ shape,
+ ),
+ _ => Some("".to_owned()),
+ }
+}
+
fn rewrite_bounded_lifetime(
lt: &ast::Lifetime,
bounds: &[ast::GenericBound],
.map(|s| format!("?{}", s)),
ast::TraitBoundModifier::MaybeConst => poly_trait_ref
.rewrite(context, shape.offset_left(7)?)
- .map(|s| format!("?const {}", s)),
+ .map(|s| format!("~const {}", s)),
ast::TraitBoundModifier::MaybeConstMaybe => poly_trait_ref
.rewrite(context, shape.offset_left(8)?)
- .map(|s| format!("?const ?{}", s)),
+ .map(|s| format!("~const ?{}", s)),
};
rewrite.map(|s| if has_paren { format!("({})", s) } else { s })
}
let mut result = String::with_capacity(128);
// FIXME: If there are more than one attributes, this will force multiline.
match self.attrs.rewrite(context, shape) {
- Some(ref rw) if !rw.is_empty() => result.push_str(&format!("{} ", rw)),
+ Some(ref rw) if !rw.is_empty() => {
+ result.push_str(rw);
+ // When rewriting generic params, an extra newline should be put
+ // if the attributes end with a doc comment
+ if let Some(true) = self.attrs.last().map(|a| a.is_doc_comment()) {
+ result.push_str(&shape.indent.to_string_with_newline(context.config));
+ } else {
+ result.push(' ');
+ }
+ }
_ => (),
}
if let ast::GenericParamKind::Const {
ref ty,
kw_span: _,
- default: _,
+ default,
} = &self.kind
{
result.push_str("const ");
result.push_str(rewrite_ident(context, self.ident));
result.push_str(": ");
result.push_str(&ty.rewrite(context, shape)?);
+ if let Some(default) = default {
+ let eq_str = match context.config.type_punctuation_density() {
+ TypeDensity::Compressed => "=",
+ TypeDensity::Wide => " = ",
+ };
+ result.push_str(eq_str);
+ let budget = shape.width.checked_sub(result.len())?;
+ let rewrite = default.rewrite(context, Shape::legacy(budget, shape.indent))?;
+ result.push_str(&rewrite);
+ }
} else {
result.push_str(rewrite_ident(context, self.ident));
}
impl Rewrite for ast::TraitRef {
fn rewrite(&self, context: &RewriteContext<'_>, shape: Shape) -> Option<String> {
- rewrite_path(context, PathContext::Type, None, &self.path, shape)
+ rewrite_path(context, PathContext::Type, &None, &self.path, shape)
}
}
rewrite_unary_prefix(context, prefix, &*mt.ty, shape)
}
- ast::TyKind::Rptr(ref lifetime, ref mt) => {
+ ast::TyKind::Ref(ref lifetime, ref mt) => {
let mut_str = format_mutability(mt.mutbl);
let mut_len = mut_str.len();
let mut result = String::with_capacity(128);
- result.push_str("&");
+ result.push('&');
let ref_hi = context.snippet_provider.span_after(self.span(), "&");
let mut cmnt_lo = ref_hi;
} else {
result.push_str(<_str);
}
- result.push_str(" ");
+ result.push(' ');
cmnt_lo = lifetime.ident.span.hi();
}
result = combine_strs_with_missing_comments(
context,
result.trim_end(),
- &mt.ty.rewrite(&context, shape)?,
+ &mt.ty.rewrite(context, shape)?,
before_ty_span,
shape,
true,
let budget = shape.width.checked_sub(used_width)?;
let ty_str = mt
.ty
- .rewrite(&context, Shape::legacy(budget, shape.indent + used_width))?;
+ .rewrite(context, Shape::legacy(budget, shape.indent + used_width))?;
result.push_str(&ty_str);
}
ast::TyKind::Tup(ref items) => {
rewrite_tuple(context, items.iter(), self.span, shape, items.len() == 1)
}
- ast::TyKind::AnonymousStruct(ref fields, recovered) => {
- let ident = Ident::new(
- kw::Struct,
- mk_sp(self.span.lo(), self.span.lo() + BytePos(6)),
- );
- let data = ast::VariantData::Struct(fields.clone(), recovered);
- let variant = ast::Variant {
- attrs: AttrVec::new(),
- id: self.id,
- span: self.span,
- vis: DEFAULT_VISIBILITY,
- ident,
- data,
- disr_expr: None,
- is_placeholder: false,
- };
- format_struct_struct(
- &context,
- &StructParts::from_variant(&variant),
- fields,
- shape.indent,
- None,
- )
- }
- ast::TyKind::AnonymousUnion(ref fields, recovered) => {
- let ident = Ident::new(
- kw::Union,
- mk_sp(self.span.lo(), self.span.lo() + BytePos(5)),
- );
- let data = ast::VariantData::Struct(fields.clone(), recovered);
- let variant = ast::Variant {
- attrs: AttrVec::new(),
- id: self.id,
- span: self.span,
- vis: DEFAULT_VISIBILITY,
- ident,
- data,
- disr_expr: None,
- is_placeholder: false,
- };
- format_struct_struct(
- &context,
- &StructParts::from_variant(&variant),
- fields,
- shape.indent,
- None,
- )
- }
ast::TyKind::Path(ref q_self, ref path) => {
- rewrite_path(context, PathContext::Type, q_self.as_ref(), path, shape)
+ rewrite_path(context, PathContext::Type, q_self, path, shape)
}
ast::TyKind::Array(ref ty, ref repeats) => rewrite_pair(
&**ty,
true,
)
.map(|v| (v, trailing_span, extendable)),
- _ => Some((
- String::from(strs) + &trailing_str,
- trailing_span,
- extendable,
- )),
+ _ => Some((strs + &trailing_str, trailing_span, extendable)),
}
},
)?;
}
}
+pub(crate) fn opaque_ty(ty: &Option<ptr::P<ast::Ty>>) -> Option<&ast::GenericBounds> {
+ ty.as_ref().and_then(|t| match &t.kind {
+ ast::TyKind::ImplTrait(_, bounds) => Some(bounds),
+ _ => None,
+ })
+}
+
pub(crate) fn can_be_overflowed_type(
context: &RewriteContext<'_>,
ty: &ast::Ty,
) -> bool {
match ty.kind {
ast::TyKind::Tup(..) => context.use_block_indent() && len == 1,
- ast::TyKind::Rptr(_, ref mutty) | ast::TyKind::Ptr(ref mutty) => {
+ ast::TyKind::Ref(_, ref mutty) | ast::TyKind::Ptr(ref mutty) => {
can_be_overflowed_type(context, &*mutty.ty, len)
}
_ => false,
}
/// Returns `None` if there is no `LifetimeDef` in the given generic parameters.
-fn rewrite_lifetime_param(
+pub(crate) fn rewrite_lifetime_param(
context: &RewriteContext<'_>,
shape: Shape,
generic_params: &[ast::GenericParam],
) -> Option<String> {
let result = generic_params
.iter()
- .filter(|p| match p.kind {
- ast::GenericParamKind::Lifetime => true,
- _ => false,
- })
+ .filter(|p| matches!(p.kind, ast::GenericParamKind::Lifetime))
.map(|lt| lt.rewrite(context, shape))
.collect::<Option<Vec<_>>>()?
.join(", ");
projects / rustc.git / blobdiff