245 lines
10 KiB
Rust
245 lines
10 KiB
Rust
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use Indent;
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use codemap::SpanUtils;
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use rewrite::{Rewrite, RewriteContext};
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use utils::{wrap_str, format_mutability};
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use lists::{format_item_list, itemize_list};
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use expr::{rewrite_unary_prefix, rewrite_pair};
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use types::rewrite_path;
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use super::Spanned;
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use comment::FindUncommented;
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use syntax::ast::{self, BindingMode, Pat, PatKind, FieldPat};
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use syntax::ptr;
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use syntax::codemap::{self, BytePos, Span};
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impl Rewrite for Pat {
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fn rewrite(&self, context: &RewriteContext, width: usize, offset: Indent) -> Option<String> {
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match self.node {
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PatKind::Box(ref pat) => rewrite_unary_prefix(context, "box ", &**pat, width, offset),
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PatKind::Ident(binding_mode, ident, ref sub_pat) => {
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let (prefix, mutability) = match binding_mode {
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BindingMode::ByRef(mutability) => ("ref ", mutability),
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BindingMode::ByValue(mutability) => ("", mutability),
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};
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let mut_infix = format_mutability(mutability);
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let id_str = ident.node.to_string();
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let sub_pat = match *sub_pat {
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Some(ref p) => {
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// 3 - ` @ `.
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let width = try_opt!(width.checked_sub(prefix.len() + mut_infix.len() +
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id_str.len() +
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3));
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format!(" @ {}", try_opt!(p.rewrite(context, width, offset)))
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}
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None => "".to_owned(),
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};
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let result = format!("{}{}{}{}", prefix, mut_infix, id_str, sub_pat);
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wrap_str(result, context.config.max_width, width, offset)
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}
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PatKind::Wild => {
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if 1 <= width {
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Some("_".to_owned())
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} else {
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None
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}
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}
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PatKind::Range(ref lhs, ref rhs) => {
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rewrite_pair(&**lhs, &**rhs, "", "...", "", context, width, offset)
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}
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PatKind::Ref(ref pat, mutability) => {
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let prefix = format!("&{}", format_mutability(mutability));
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rewrite_unary_prefix(context, &prefix, &**pat, width, offset)
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}
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PatKind::Tuple(ref items, dotdot_pos) => {
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rewrite_tuple_pat(items, dotdot_pos, None, self.span, context, width, offset)
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}
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PatKind::Path(ref q_self, ref path) => {
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rewrite_path(context, true, q_self.as_ref(), path, width, offset)
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}
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PatKind::TupleStruct(ref path, ref pat_vec, dotdot_pos) => {
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let path_str = try_opt!(rewrite_path(context, true, None, path, width, offset));
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rewrite_tuple_pat(pat_vec,
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dotdot_pos,
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Some(path_str),
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self.span,
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context,
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width,
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offset)
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}
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PatKind::Lit(ref expr) => expr.rewrite(context, width, offset),
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PatKind::Vec(ref prefix, ref slice_pat, ref suffix) => {
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// Rewrite all the sub-patterns.
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let prefix = prefix.iter().map(|p| p.rewrite(context, width, offset));
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let slice_pat = slice_pat.as_ref()
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.map(|p| Some(format!("{}..", try_opt!(p.rewrite(context, width, offset)))));
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let suffix = suffix.iter().map(|p| p.rewrite(context, width, offset));
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// Munge them together.
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let pats: Option<Vec<String>> = prefix.chain(slice_pat.into_iter())
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.chain(suffix)
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.collect();
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// Check that all the rewrites succeeded, and if not return None.
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let pats = try_opt!(pats);
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// Unwrap all the sub-strings and join them with commas.
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let result = format!("[{}]", pats.join(", "));
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wrap_str(result, context.config.max_width, width, offset)
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}
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PatKind::Struct(ref path, ref fields, elipses) => {
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let path = try_opt!(rewrite_path(context, true, None, path, width, offset));
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let (elipses_str, terminator) = if elipses { (", ..", "..") } else { ("", "}") };
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// 5 = `{` plus space before and after plus `}` plus space before.
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let budget = try_opt!(width.checked_sub(path.len() + 5 + elipses_str.len()));
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// FIXME Using visual indenting, should use block or visual to match
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// struct lit preference (however, in practice I think it is rare
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// for struct patterns to be multi-line).
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// 3 = `{` plus space before and after.
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let offset = offset + path.len() + 3;
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let items = itemize_list(context.codemap,
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fields.iter(),
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terminator,
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|f| f.span.lo,
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|f| f.span.hi,
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|f| f.node.rewrite(context, budget, offset),
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context.codemap.span_after(self.span, "{"),
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self.span.hi);
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let mut field_string =
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try_opt!(format_item_list(items, budget, offset, context.config));
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if elipses {
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if field_string.contains('\n') {
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field_string.push_str(",\n");
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field_string.push_str(&offset.to_string(context.config));
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field_string.push_str("..");
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} else {
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if !field_string.is_empty() {
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field_string.push_str(", ");
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}
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field_string.push_str("..");
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}
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}
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if field_string.is_empty() {
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Some(format!("{} {{}}", path))
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} else {
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Some(format!("{} {{ {} }}", path, field_string))
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}
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}
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// FIXME(#819) format pattern macros.
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PatKind::Mac(..) => {
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wrap_str(context.snippet(self.span),
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context.config.max_width,
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width,
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offset)
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}
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}
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}
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}
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impl Rewrite for FieldPat {
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fn rewrite(&self, context: &RewriteContext, width: usize, offset: Indent) -> Option<String> {
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let pat = self.pat.rewrite(context, width, offset);
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if self.is_shorthand {
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pat
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} else {
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wrap_str(format!("{}: {}", self.ident.to_string(), try_opt!(pat)),
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context.config.max_width,
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width,
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offset)
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}
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}
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}
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enum TuplePatField<'a> {
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Pat(&'a ptr::P<ast::Pat>),
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Dotdot(Span),
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}
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impl<'a> Rewrite for TuplePatField<'a> {
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fn rewrite(&self, context: &RewriteContext, width: usize, offset: Indent) -> Option<String> {
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match *self {
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TuplePatField::Pat(ref p) => p.rewrite(context, width, offset),
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TuplePatField::Dotdot(_) => Some("..".to_string()),
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}
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}
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}
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impl<'a> Spanned for TuplePatField<'a> {
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fn span(&self) -> Span {
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match *self {
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TuplePatField::Pat(ref p) => p.span(),
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TuplePatField::Dotdot(span) => span,
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}
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}
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}
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fn rewrite_tuple_pat(pats: &[ptr::P<ast::Pat>],
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dotdot_pos: Option<usize>,
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path_str: Option<String>,
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span: Span,
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context: &RewriteContext,
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width: usize,
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offset: Indent)
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-> Option<String> {
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let mut pat_vec: Vec<_> = pats.into_iter().map(|x| TuplePatField::Pat(x)).collect();
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if let Some(pos) = dotdot_pos {
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let snippet = context.snippet(span);
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let lo = span.lo + BytePos(snippet.find_uncommented("..").unwrap() as u32);
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let span = Span {
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lo: lo,
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// 2 == "..".len()
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hi: lo + BytePos(2),
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expn_id: codemap::NO_EXPANSION,
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};
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let dotdot = TuplePatField::Dotdot(span);
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pat_vec.insert(pos, dotdot);
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}
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if pat_vec.is_empty() {
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path_str
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} else {
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// add comma if `(x,)`
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let add_comma = path_str.is_none() && pat_vec.len() == 1 && dotdot_pos.is_none();
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let path_len = path_str.as_ref().map(|p| p.len()).unwrap_or(0);
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// 2 = "()".len(), 3 = "(,)".len()
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let width = try_opt!(width.checked_sub(path_len + if add_comma { 3 } else { 2 }));
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// 1 = "(".len()
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let offset = offset + path_len + 1;
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let items = itemize_list(context.codemap,
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pat_vec.iter(),
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if add_comma { ",)" } else { ")" },
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|item| item.span().lo,
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|item| item.span().hi,
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|item| item.rewrite(context, width, offset),
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context.codemap.span_after(span, "("),
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span.hi - BytePos(1));
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let list = try_opt!(format_item_list(items, width, offset, context.config));
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match path_str {
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Some(path_str) => Some(format!("{}({})", path_str, list)),
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None => {
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let comma = if add_comma { "," } else { "" };
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Some(format!("({}{})", list, comma))
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}
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}
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}
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}
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