627 lines
26 KiB
Rust
627 lines
26 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 syntax::{ast, ptr, visit};
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use syntax::codemap::{self, CodeMap, Span, BytePos};
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use syntax::parse::ParseSess;
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use strings::string_buffer::StringBuffer;
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use {Indent, Shape};
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use utils;
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use codemap::{LineRangeUtils, SpanUtils};
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use config::Config;
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use rewrite::{Rewrite, RewriteContext};
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use comment::rewrite_comment;
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use macros::{rewrite_macro, MacroPosition};
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use items::{rewrite_static, rewrite_associated_type, rewrite_type_alias, format_impl, format_trait};
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fn is_use_item(item: &ast::Item) -> bool {
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match item.node {
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ast::ItemKind::Use(_) => true,
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_ => false,
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}
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}
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pub struct FmtVisitor<'a> {
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pub parse_session: &'a ParseSess,
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pub codemap: &'a CodeMap,
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pub buffer: StringBuffer,
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pub last_pos: BytePos,
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// FIXME: use an RAII util or closure for indenting
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pub block_indent: Indent,
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pub config: &'a Config,
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}
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impl<'a> FmtVisitor<'a> {
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fn visit_stmt(&mut self, stmt: &ast::Stmt) {
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debug!("visit_stmt: {:?} {:?}",
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self.codemap.lookup_char_pos(stmt.span.lo),
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self.codemap.lookup_char_pos(stmt.span.hi));
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// FIXME(#434): Move this check to somewhere more central, eg Rewrite.
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if !self.config.file_lines.contains(&self.codemap.lookup_line_range(stmt.span)) {
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return;
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}
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match stmt.node {
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ast::StmtKind::Item(ref item) => {
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self.visit_item(item);
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}
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ast::StmtKind::Local(..) |
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ast::StmtKind::Expr(..) |
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ast::StmtKind::Semi(..) => {
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let rewrite = stmt.rewrite(&self.get_context(),
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Shape::legacy(self.config.max_width -
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self.block_indent.width(),
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self.block_indent));
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self.push_rewrite(stmt.span, rewrite);
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}
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ast::StmtKind::Mac(ref mac) => {
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let (ref mac, _macro_style, _) = **mac;
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self.visit_mac(mac, None, MacroPosition::Statement);
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self.format_missing(stmt.span.hi);
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}
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}
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}
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pub fn visit_block(&mut self, b: &ast::Block) {
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debug!("visit_block: {:?} {:?}",
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self.codemap.lookup_char_pos(b.span.lo),
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self.codemap.lookup_char_pos(b.span.hi));
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// Check if this block has braces.
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let snippet = self.snippet(b.span);
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let has_braces = snippet.starts_with('{') || snippet.starts_with("unsafe");
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let brace_compensation = if has_braces { BytePos(1) } else { BytePos(0) };
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self.last_pos = self.last_pos + brace_compensation;
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self.block_indent = self.block_indent.block_indent(self.config);
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self.buffer.push_str("{");
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for stmt in &b.stmts {
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self.visit_stmt(stmt)
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}
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if !b.stmts.is_empty() {
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if let Some(expr) = utils::stmt_expr(&b.stmts[b.stmts.len() - 1]) {
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if utils::semicolon_for_expr(expr) {
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self.buffer.push_str(";");
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}
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}
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}
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// FIXME: we should compress any newlines here to just one
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self.format_missing_with_indent(source!(self, b.span).hi - brace_compensation);
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self.close_block();
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self.last_pos = source!(self, b.span).hi;
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}
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// FIXME: this is a terrible hack to indent the comments between the last
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// item in the block and the closing brace to the block's level.
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// The closing brace itself, however, should be indented at a shallower
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// level.
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fn close_block(&mut self) {
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let total_len = self.buffer.len;
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let chars_too_many = if self.config.hard_tabs {
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1
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} else {
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self.config.tab_spaces
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};
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self.buffer.truncate(total_len - chars_too_many);
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self.buffer.push_str("}");
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self.block_indent = self.block_indent.block_unindent(self.config);
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}
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// Note that this only gets called for function definitions. Required methods
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// on traits do not get handled here.
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fn visit_fn(&mut self,
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fk: visit::FnKind,
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fd: &ast::FnDecl,
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s: Span,
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_: ast::NodeId,
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defaultness: ast::Defaultness) {
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let indent = self.block_indent;
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let block;
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let rewrite = match fk {
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visit::FnKind::ItemFn(ident, generics, unsafety, constness, abi, vis, b) => {
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block = b;
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self.rewrite_fn(indent,
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ident,
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fd,
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generics,
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unsafety,
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constness.node,
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defaultness,
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abi,
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vis,
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codemap::mk_sp(s.lo, b.span.lo),
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&b)
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}
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visit::FnKind::Method(ident, sig, vis, b) => {
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block = b;
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self.rewrite_fn(indent,
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ident,
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fd,
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&sig.generics,
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sig.unsafety,
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sig.constness.node,
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defaultness,
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sig.abi,
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vis.unwrap_or(&ast::Visibility::Inherited),
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codemap::mk_sp(s.lo, b.span.lo),
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&b)
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}
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visit::FnKind::Closure(_) => unreachable!(),
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};
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if let Some(fn_str) = rewrite {
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self.format_missing_with_indent(source!(self, s).lo);
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self.buffer.push_str(&fn_str);
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if let Some(c) = fn_str.chars().last() {
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if c == '}' {
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self.last_pos = source!(self, block.span).hi;
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return;
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}
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}
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} else {
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self.format_missing(source!(self, block.span).lo);
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}
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self.last_pos = source!(self, block.span).lo;
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self.visit_block(block)
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}
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pub fn visit_item(&mut self, item: &ast::Item) {
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// This is where we bail out if there is a skip attribute. This is only
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// complex in the module case. It is complex because the module could be
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// in a separate file and there might be attributes in both files, but
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// the AST lumps them all together.
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match item.node {
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ast::ItemKind::Mod(ref m) => {
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let outer_file = self.codemap.lookup_char_pos(item.span.lo).file;
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let inner_file = self.codemap.lookup_char_pos(m.inner.lo).file;
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if outer_file.name == inner_file.name {
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// Module is inline, in this case we treat modules like any
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// other item.
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if self.visit_attrs(&item.attrs) {
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self.push_rewrite(item.span, None);
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return;
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}
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} else if utils::contains_skip(&item.attrs) {
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// Module is not inline, but should be skipped.
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return;
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} else {
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// Module is not inline and should not be skipped. We want
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// to process only the attributes in the current file.
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let attrs = item.attrs
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.iter()
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.filter_map(|a| {
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let attr_file = self.codemap.lookup_char_pos(a.span.lo).file;
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if attr_file.name == outer_file.name {
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Some(a.clone())
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} else {
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None
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}
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})
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.collect::<Vec<_>>();
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// Assert because if we should skip it should be caught by
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// the above case.
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assert!(!self.visit_attrs(&attrs));
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}
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}
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_ => {
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if self.visit_attrs(&item.attrs) {
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self.push_rewrite(item.span, None);
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return;
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}
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}
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}
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match item.node {
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ast::ItemKind::Use(ref vp) => {
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self.format_import(&item.vis, vp, item.span);
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}
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ast::ItemKind::Impl(..) => {
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self.format_missing_with_indent(source!(self, item.span).lo);
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if let Some(impl_str) = format_impl(&self.get_context(), item, self.block_indent) {
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self.buffer.push_str(&impl_str);
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self.last_pos = source!(self, item.span).hi;
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}
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}
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ast::ItemKind::Trait(..) => {
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self.format_missing_with_indent(item.span.lo);
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if let Some(trait_str) = format_trait(&self.get_context(),
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item,
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self.block_indent) {
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self.buffer.push_str(&trait_str);
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self.last_pos = source!(self, item.span).hi;
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}
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}
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ast::ItemKind::ExternCrate(_) => {
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self.format_missing_with_indent(source!(self, item.span).lo);
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let new_str = self.snippet(item.span);
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self.buffer.push_str(&new_str);
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self.last_pos = source!(self, item.span).hi;
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}
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ast::ItemKind::Struct(ref def, ref generics) => {
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let rewrite = {
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let indent = self.block_indent;
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let context = self.get_context();
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::items::format_struct(&context,
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"struct ",
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item.ident,
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&item.vis,
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def,
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Some(generics),
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item.span,
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indent,
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None)
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.map(|s| match *def {
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ast::VariantData::Tuple(..) => s + ";",
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_ => s,
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})
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};
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self.push_rewrite(item.span, rewrite);
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}
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ast::ItemKind::Enum(ref def, ref generics) => {
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self.format_missing_with_indent(source!(self, item.span).lo);
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self.visit_enum(item.ident, &item.vis, def, generics, item.span);
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self.last_pos = source!(self, item.span).hi;
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}
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ast::ItemKind::Mod(ref module) => {
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self.format_missing_with_indent(source!(self, item.span).lo);
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self.format_mod(module, &item.vis, item.span, item.ident);
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}
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ast::ItemKind::Mac(ref mac) => {
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self.visit_mac(mac, Some(item.ident), MacroPosition::Item);
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}
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ast::ItemKind::ForeignMod(ref foreign_mod) => {
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self.format_missing_with_indent(source!(self, item.span).lo);
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self.format_foreign_mod(foreign_mod, item.span);
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}
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ast::ItemKind::Static(ref ty, mutability, ref expr) => {
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let rewrite = rewrite_static("static",
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&item.vis,
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item.ident,
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ty,
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mutability,
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Some(expr),
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self.block_indent,
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&self.get_context());
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self.push_rewrite(item.span, rewrite);
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}
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ast::ItemKind::Const(ref ty, ref expr) => {
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let rewrite = rewrite_static("const",
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&item.vis,
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item.ident,
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ty,
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ast::Mutability::Immutable,
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Some(expr),
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self.block_indent,
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&self.get_context());
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self.push_rewrite(item.span, rewrite);
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}
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ast::ItemKind::DefaultImpl(..) => {
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// FIXME(#78): format impl definitions.
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}
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ast::ItemKind::Fn(ref decl, unsafety, constness, abi, ref generics, ref body) => {
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self.visit_fn(visit::FnKind::ItemFn(item.ident,
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generics,
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unsafety,
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constness,
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abi,
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&item.vis,
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body),
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decl,
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item.span,
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item.id,
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ast::Defaultness::Final)
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}
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ast::ItemKind::Ty(ref ty, ref generics) => {
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let rewrite = rewrite_type_alias(&self.get_context(),
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self.block_indent,
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item.ident,
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ty,
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generics,
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&item.vis,
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item.span);
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self.push_rewrite(item.span, rewrite);
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}
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ast::ItemKind::Union(..) => {
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// FIXME(#1157): format union definitions.
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}
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}
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}
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pub fn visit_trait_item(&mut self, ti: &ast::TraitItem) {
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if self.visit_attrs(&ti.attrs) {
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self.push_rewrite(ti.span, None);
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return;
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}
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match ti.node {
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ast::TraitItemKind::Const(ref ty, ref expr_opt) => {
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let rewrite = rewrite_static("const",
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&ast::Visibility::Inherited,
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ti.ident,
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ty,
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ast::Mutability::Immutable,
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expr_opt.as_ref(),
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self.block_indent,
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&self.get_context());
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self.push_rewrite(ti.span, rewrite);
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}
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ast::TraitItemKind::Method(ref sig, None) => {
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let indent = self.block_indent;
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let rewrite = self.rewrite_required_fn(indent, ti.ident, sig, ti.span);
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self.push_rewrite(ti.span, rewrite);
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}
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ast::TraitItemKind::Method(ref sig, Some(ref body)) => {
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self.visit_fn(visit::FnKind::Method(ti.ident, sig, None, body),
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&sig.decl,
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ti.span,
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ti.id,
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ast::Defaultness::Final);
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}
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ast::TraitItemKind::Type(ref type_param_bounds, _) => {
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let rewrite = rewrite_associated_type(ti.ident,
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None,
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Some(type_param_bounds),
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&self.get_context(),
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self.block_indent);
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self.push_rewrite(ti.span, rewrite);
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}
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ast::TraitItemKind::Macro(..) => {
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// FIXME(#1158) Macros in trait item position
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}
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}
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}
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pub fn visit_impl_item(&mut self, ii: &ast::ImplItem) {
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if self.visit_attrs(&ii.attrs) {
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self.push_rewrite(ii.span, None);
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return;
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}
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match ii.node {
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ast::ImplItemKind::Method(ref sig, ref body) => {
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self.visit_fn(visit::FnKind::Method(ii.ident, sig, Some(&ii.vis), body),
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&sig.decl,
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ii.span,
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ii.id,
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ii.defaultness);
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}
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ast::ImplItemKind::Const(ref ty, ref expr) => {
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let rewrite = rewrite_static("const",
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&ii.vis,
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ii.ident,
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ty,
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ast::Mutability::Immutable,
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Some(expr),
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self.block_indent,
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&self.get_context());
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self.push_rewrite(ii.span, rewrite);
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}
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ast::ImplItemKind::Type(ref ty) => {
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let rewrite = rewrite_associated_type(ii.ident,
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Some(ty),
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None,
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&self.get_context(),
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self.block_indent);
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self.push_rewrite(ii.span, rewrite);
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}
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ast::ImplItemKind::Macro(ref mac) => {
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self.visit_mac(mac, Some(ii.ident), MacroPosition::Item);
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}
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}
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}
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fn visit_mac(&mut self, mac: &ast::Mac, ident: Option<ast::Ident>, pos: MacroPosition) {
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// 1 = ;
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let width = self.config.max_width - self.block_indent.width() - 1;
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let rewrite = rewrite_macro(mac,
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ident,
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&self.get_context(),
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Shape::legacy(width, self.block_indent),
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pos);
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self.push_rewrite(mac.span, rewrite);
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}
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fn push_rewrite(&mut self, span: Span, rewrite: Option<String>) {
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self.format_missing_with_indent(source!(self, span).lo);
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let result = rewrite.unwrap_or_else(|| self.snippet(span));
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self.buffer.push_str(&result);
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self.last_pos = source!(self, span).hi;
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}
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pub fn from_codemap(parse_session: &'a ParseSess, config: &'a Config) -> FmtVisitor<'a> {
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FmtVisitor {
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parse_session: parse_session,
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codemap: parse_session.codemap(),
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buffer: StringBuffer::new(),
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last_pos: BytePos(0),
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block_indent: Indent {
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block_indent: 0,
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alignment: 0,
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},
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config: config,
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}
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}
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pub fn snippet(&self, span: Span) -> String {
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match self.codemap.span_to_snippet(span) {
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Ok(s) => s,
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Err(_) => {
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println!("Couldn't make snippet for span {:?}->{:?}",
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self.codemap.lookup_char_pos(span.lo),
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self.codemap.lookup_char_pos(span.hi));
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"".to_owned()
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}
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}
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}
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|
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// Returns true if we should skip the following item.
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pub fn visit_attrs(&mut self, attrs: &[ast::Attribute]) -> bool {
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if utils::contains_skip(attrs) {
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return true;
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}
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let outers: Vec<_> = attrs.iter()
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.filter(|a| a.style == ast::AttrStyle::Outer)
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.cloned()
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.collect();
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if outers.is_empty() {
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return false;
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}
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let first = &outers[0];
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self.format_missing_with_indent(source!(self, first.span).lo);
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let rewrite = outers.rewrite(&self.get_context(),
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Shape::legacy(self.config.max_width - self.block_indent.width(),
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self.block_indent))
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.unwrap();
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self.buffer.push_str(&rewrite);
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let last = outers.last().unwrap();
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self.last_pos = source!(self, last.span).hi;
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false
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}
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fn walk_mod_items(&mut self, m: &ast::Mod) {
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let mut items_left: &[ptr::P<ast::Item>] = &m.items;
|
|
while !items_left.is_empty() {
|
|
// If the next item is a `use` declaration, then extract it and any subsequent `use`s
|
|
// to be potentially reordered within `format_imports`. Otherwise, just format the
|
|
// next item for output.
|
|
if self.config.reorder_imports && is_use_item(&*items_left[0]) {
|
|
let use_item_length =
|
|
items_left.iter().take_while(|ppi| is_use_item(&***ppi)).count();
|
|
let (use_items, rest) = items_left.split_at(use_item_length);
|
|
self.format_imports(use_items);
|
|
items_left = rest;
|
|
} else {
|
|
// `unwrap()` is safe here because we know `items_left`
|
|
// has elements from the loop condition
|
|
let (item, rest) = items_left.split_first().unwrap();
|
|
self.visit_item(item);
|
|
items_left = rest;
|
|
}
|
|
}
|
|
}
|
|
|
|
fn format_mod(&mut self, m: &ast::Mod, vis: &ast::Visibility, s: Span, ident: ast::Ident) {
|
|
// Decide whether this is an inline mod or an external mod.
|
|
let local_file_name = self.codemap.span_to_filename(s);
|
|
let inner_span = source!(self, m.inner);
|
|
let is_internal = !(inner_span.lo.0 == 0 && inner_span.hi.0 == 0) &&
|
|
local_file_name == self.codemap.span_to_filename(inner_span);
|
|
|
|
self.buffer.push_str(&*utils::format_visibility(vis));
|
|
self.buffer.push_str("mod ");
|
|
self.buffer.push_str(&ident.to_string());
|
|
|
|
if is_internal {
|
|
self.buffer.push_str(" {");
|
|
// Hackery to account for the closing }.
|
|
let mod_lo = self.codemap.span_after(source!(self, s), "{");
|
|
let body_snippet =
|
|
self.snippet(codemap::mk_sp(mod_lo, source!(self, m.inner).hi - BytePos(1)));
|
|
let body_snippet = body_snippet.trim();
|
|
if body_snippet.is_empty() {
|
|
self.buffer.push_str("}");
|
|
} else {
|
|
self.last_pos = mod_lo;
|
|
self.block_indent = self.block_indent.block_indent(self.config);
|
|
self.walk_mod_items(m);
|
|
self.format_missing_with_indent(source!(self, m.inner).hi - BytePos(1));
|
|
self.close_block();
|
|
}
|
|
self.last_pos = source!(self, m.inner).hi;
|
|
} else {
|
|
self.buffer.push_str(";");
|
|
self.last_pos = source!(self, s).hi;
|
|
}
|
|
}
|
|
|
|
pub fn format_separate_mod(&mut self, m: &ast::Mod) {
|
|
let filemap = self.codemap.lookup_char_pos(m.inner.lo).file;
|
|
self.last_pos = filemap.start_pos;
|
|
self.block_indent = Indent::empty();
|
|
self.walk_mod_items(m);
|
|
self.format_missing_with_indent(filemap.end_pos);
|
|
}
|
|
|
|
pub fn get_context(&self) -> RewriteContext {
|
|
RewriteContext {
|
|
parse_session: self.parse_session,
|
|
codemap: self.codemap,
|
|
config: self.config,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'a> Rewrite for [ast::Attribute] {
|
|
fn rewrite(&self, context: &RewriteContext, shape: Shape) -> Option<String> {
|
|
let mut result = String::new();
|
|
if self.is_empty() {
|
|
return Some(result);
|
|
}
|
|
let indent = shape.indent.to_string(context.config);
|
|
|
|
for (i, a) in self.iter().enumerate() {
|
|
let mut a_str = context.snippet(a.span);
|
|
|
|
// Write comments and blank lines between attributes.
|
|
if i > 0 {
|
|
let comment = context.snippet(codemap::mk_sp(self[i - 1].span.hi, a.span.lo));
|
|
// This particular horror show is to preserve line breaks in between doc
|
|
// comments. An alternative would be to force such line breaks to start
|
|
// with the usual doc comment token.
|
|
let multi_line = a_str.starts_with("//") && comment.matches('\n').count() > 1;
|
|
let comment = comment.trim();
|
|
if !comment.is_empty() {
|
|
let comment = try_opt!(rewrite_comment(comment,
|
|
false,
|
|
Shape::legacy(context.config
|
|
.ideal_width -
|
|
shape.indent.width(),
|
|
shape.indent),
|
|
context.config));
|
|
result.push_str(&indent);
|
|
result.push_str(&comment);
|
|
result.push('\n');
|
|
} else if multi_line {
|
|
result.push('\n');
|
|
}
|
|
result.push_str(&indent);
|
|
}
|
|
|
|
if a_str.starts_with("//") {
|
|
a_str = try_opt!(rewrite_comment(&a_str,
|
|
false,
|
|
Shape::legacy(context.config.ideal_width -
|
|
shape.indent.width(),
|
|
shape.indent),
|
|
context.config));
|
|
}
|
|
|
|
// Write the attribute itself.
|
|
result.push_str(&a_str);
|
|
|
|
if i < self.len() - 1 {
|
|
result.push('\n');
|
|
}
|
|
}
|
|
|
|
Some(result)
|
|
}
|
|
}
|