102 lines
4.1 KiB
Rust
102 lines
4.1 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 visitor::FmtVisitor;
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use syntax::codemap::{self, BytePos};
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impl<'a> FmtVisitor<'a> {
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// TODO these format_missing methods are ugly. Refactor and add unit tests
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// for the central whitespace stripping loop.
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pub fn format_missing(&mut self, end: BytePos) {
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self.format_missing_inner(end,
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|this, last_snippet, _| this.buffer.push_str(last_snippet))
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}
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pub fn format_missing_with_indent(&mut self, end: BytePos) {
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let config = self.config;
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self.format_missing_inner(end,
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|this, last_snippet, snippet| {
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this.buffer.push_str(last_snippet.trim_right());
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if last_snippet == snippet {
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// No new lines in the snippet.
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this.buffer.push_str("\n");
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}
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let indent = this.block_indent.to_string(config);
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this.buffer.push_str(&indent);
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})
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}
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fn format_missing_inner<F: Fn(&mut FmtVisitor, &str, &str)>(&mut self,
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end: BytePos,
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process_last_snippet: F) {
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let start = self.last_pos;
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debug!("format_missing_inner: {:?} to {:?}",
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self.codemap.lookup_char_pos(start),
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self.codemap.lookup_char_pos(end));
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if start == end {
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// Do nothing if this is the beginning of the file.
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if start == self.codemap.lookup_char_pos(start).file.start_pos {
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return;
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}
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process_last_snippet(self, "", "");
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return;
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}
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assert!(start < end,
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"Request to format inverted span: {:?} to {:?}",
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self.codemap.lookup_char_pos(start),
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self.codemap.lookup_char_pos(end));
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self.last_pos = end;
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let span = codemap::mk_sp(start, end);
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let snippet = self.snippet(span);
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self.write_snippet(&snippet, true, &process_last_snippet);
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}
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fn write_snippet<F: Fn(&mut FmtVisitor, &str, &str)>(&mut self,
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snippet: &str,
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last_snippet: bool,
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process_last_snippet: F) {
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// Trim whitespace from the right hand side of each line.
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// Annoyingly, the library functions for splitting by lines etc. are not
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// quite right, so we must do it ourselves.
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let mut line_start = 0;
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let mut last_wspace = None;
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for (i, c) in snippet.char_indices() {
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if c == '\n' {
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if let Some(lw) = last_wspace {
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self.buffer.push_str(&snippet[line_start..lw]);
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self.buffer.push_str("\n");
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} else {
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self.buffer.push_str(&snippet[line_start..i+1]);
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}
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line_start = i + 1;
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last_wspace = None;
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} else {
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if c.is_whitespace() {
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if last_wspace.is_none() {
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last_wspace = Some(i);
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}
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} else {
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last_wspace = None;
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}
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}
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}
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if last_snippet {
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process_last_snippet(self, &snippet[line_start..], snippet);
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} else {
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self.buffer.push_str(&snippet[line_start..]);
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}
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}
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}
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