1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
12 use fmt::{self, Write, FlagV1};
14 struct PadAdapter<'a, 'b: 'a> {
15 fmt: &'a mut fmt::Formatter<'b>,
19 impl<'a, 'b: 'a> PadAdapter<'a, 'b> {
20 fn new(fmt: &'a mut fmt::Formatter<'b>) -> PadAdapter<'a, 'b> {
28 impl<'a, 'b: 'a> fmt::Write for PadAdapter<'a, 'b> {
29 fn write_str(&mut self, mut s: &str) -> fmt::Result {
32 try!(self.fmt.write_str(" "));
35 let split = match s.find('\n') {
37 self.on_newline = true;
41 self.on_newline = false;
45 try!(self.fmt.write_str(&s[..split]));
53 /// A struct to help with `fmt::Debug` implementations.
55 /// Constructed by the `Formatter::debug_struct` method.
57 #[stable(feature = "debug_builders", since = "1.2.0")]
58 pub struct DebugStruct<'a, 'b: 'a> {
59 fmt: &'a mut fmt::Formatter<'b>,
64 pub fn debug_struct_new<'a, 'b>(fmt: &'a mut fmt::Formatter<'b>,
66 -> DebugStruct<'a, 'b> {
67 let result = fmt.write_str(name);
75 impl<'a, 'b: 'a> DebugStruct<'a, 'b> {
76 /// Adds a new field to the generated struct output.
77 #[stable(feature = "debug_builders", since = "1.2.0")]
78 pub fn field(&mut self, name: &str, value: &fmt::Debug) -> &mut DebugStruct<'a, 'b> {
79 self.result = self.result.and_then(|_| {
80 let prefix = if self.has_fields {
87 let mut writer = PadAdapter::new(self.fmt);
88 fmt::write(&mut writer,
89 format_args!("{}\n{}: {:#?}", prefix, name, value))
91 write!(self.fmt, "{} {}: {:?}", prefix, name, value)
95 self.has_fields = true;
99 /// Finishes output and returns any error encountered.
100 #[stable(feature = "debug_builders", since = "1.2.0")]
101 pub fn finish(&mut self) -> fmt::Result {
103 self.result = self.result.and_then(|_| {
104 if self.is_pretty() {
105 self.fmt.write_str("\n}")
107 self.fmt.write_str(" }")
114 fn is_pretty(&self) -> bool {
115 self.fmt.flags() & (1 << (FlagV1::Alternate as usize)) != 0
119 /// A struct to help with `fmt::Debug` implementations.
121 /// Constructed by the `Formatter::debug_tuple` method.
123 #[stable(feature = "debug_builders", since = "1.2.0")]
124 pub struct DebugTuple<'a, 'b: 'a> {
125 fmt: &'a mut fmt::Formatter<'b>,
130 pub fn debug_tuple_new<'a, 'b>(fmt: &'a mut fmt::Formatter<'b>, name: &str) -> DebugTuple<'a, 'b> {
131 let result = fmt.write_str(name);
139 impl<'a, 'b: 'a> DebugTuple<'a, 'b> {
140 /// Adds a new field to the generated tuple struct output.
141 #[stable(feature = "debug_builders", since = "1.2.0")]
142 pub fn field(&mut self, value: &fmt::Debug) -> &mut DebugTuple<'a, 'b> {
143 self.result = self.result.and_then(|_| {
144 let (prefix, space) = if self.has_fields {
150 if self.is_pretty() {
151 let mut writer = PadAdapter::new(self.fmt);
152 fmt::write(&mut writer, format_args!("{}\n{:#?}", prefix, value))
154 write!(self.fmt, "{}{}{:?}", prefix, space, value)
158 self.has_fields = true;
162 /// Finishes output and returns any error encountered.
163 #[stable(feature = "debug_builders", since = "1.2.0")]
164 pub fn finish(&mut self) -> fmt::Result {
166 self.result = self.result.and_then(|_| {
167 if self.is_pretty() {
168 self.fmt.write_str("\n)")
170 self.fmt.write_str(")")
177 fn is_pretty(&self) -> bool {
178 self.fmt.flags() & (1 << (FlagV1::Alternate as usize)) != 0
181 /// Returns the wrapped `Formatter`.
182 #[unstable(feature = "debug_builder_formatter", reason = "recently added",
184 #[rustc_deprecated(since = "1.7.0", reason = "will be removed")]
185 pub fn formatter(&mut self) -> &mut fmt::Formatter<'b> {
190 struct DebugInner<'a, 'b: 'a> {
191 fmt: &'a mut fmt::Formatter<'b>,
196 impl<'a, 'b: 'a> DebugInner<'a, 'b> {
197 fn entry(&mut self, entry: &fmt::Debug) {
198 self.result = self.result.and_then(|_| {
199 if self.is_pretty() {
200 let mut writer = PadAdapter::new(self.fmt);
201 let prefix = if self.has_fields {
206 fmt::write(&mut writer, format_args!("{}\n{:#?}", prefix, entry))
208 let prefix = if self.has_fields {
213 write!(self.fmt, "{}{:?}", prefix, entry)
217 self.has_fields = true;
220 pub fn finish(&mut self) {
221 let prefix = if self.is_pretty() && self.has_fields {
226 self.result = self.result.and_then(|_| self.fmt.write_str(prefix));
229 fn is_pretty(&self) -> bool {
230 self.fmt.flags() & (1 << (FlagV1::Alternate as usize)) != 0
234 /// A struct to help with `fmt::Debug` implementations.
236 /// Constructed by the `Formatter::debug_set` method.
238 #[stable(feature = "debug_builders", since = "1.2.0")]
239 pub struct DebugSet<'a, 'b: 'a> {
240 inner: DebugInner<'a, 'b>,
243 pub fn debug_set_new<'a, 'b>(fmt: &'a mut fmt::Formatter<'b>) -> DebugSet<'a, 'b> {
244 let result = write!(fmt, "{{");
254 impl<'a, 'b: 'a> DebugSet<'a, 'b> {
255 /// Adds a new entry to the set output.
256 #[stable(feature = "debug_builders", since = "1.2.0")]
257 pub fn entry(&mut self, entry: &fmt::Debug) -> &mut DebugSet<'a, 'b> {
258 self.inner.entry(entry);
262 /// Adds the contents of an iterator of entries to the set output.
263 #[stable(feature = "debug_builders", since = "1.2.0")]
264 pub fn entries<D, I>(&mut self, entries: I) -> &mut DebugSet<'a, 'b>
266 I: IntoIterator<Item = D>
268 for entry in entries {
274 /// Finishes output and returns any error encountered.
275 #[stable(feature = "debug_builders", since = "1.2.0")]
276 pub fn finish(&mut self) -> fmt::Result {
278 self.inner.result.and_then(|_| self.inner.fmt.write_str("}"))
282 /// A struct to help with `fmt::Debug` implementations.
284 /// Constructed by the `Formatter::debug_list` method.
286 #[stable(feature = "debug_builders", since = "1.2.0")]
287 pub struct DebugList<'a, 'b: 'a> {
288 inner: DebugInner<'a, 'b>,
291 pub fn debug_list_new<'a, 'b>(fmt: &'a mut fmt::Formatter<'b>) -> DebugList<'a, 'b> {
292 let result = write!(fmt, "[");
302 impl<'a, 'b: 'a> DebugList<'a, 'b> {
303 /// Adds a new entry to the list output.
304 #[stable(feature = "debug_builders", since = "1.2.0")]
305 pub fn entry(&mut self, entry: &fmt::Debug) -> &mut DebugList<'a, 'b> {
306 self.inner.entry(entry);
310 /// Adds the contents of an iterator of entries to the list output.
311 #[stable(feature = "debug_builders", since = "1.2.0")]
312 pub fn entries<D, I>(&mut self, entries: I) -> &mut DebugList<'a, 'b>
314 I: IntoIterator<Item = D>
316 for entry in entries {
322 /// Finishes output and returns any error encountered.
323 #[stable(feature = "debug_builders", since = "1.2.0")]
324 pub fn finish(&mut self) -> fmt::Result {
326 self.inner.result.and_then(|_| self.inner.fmt.write_str("]"))
330 /// A struct to help with `fmt::Debug` implementations.
332 /// Constructed by the `Formatter::debug_map` method.
334 #[stable(feature = "debug_builders", since = "1.2.0")]
335 pub struct DebugMap<'a, 'b: 'a> {
336 fmt: &'a mut fmt::Formatter<'b>,
341 pub fn debug_map_new<'a, 'b>(fmt: &'a mut fmt::Formatter<'b>) -> DebugMap<'a, 'b> {
342 let result = write!(fmt, "{{");
350 impl<'a, 'b: 'a> DebugMap<'a, 'b> {
351 /// Adds a new entry to the map output.
352 #[stable(feature = "debug_builders", since = "1.2.0")]
353 pub fn entry(&mut self, key: &fmt::Debug, value: &fmt::Debug) -> &mut DebugMap<'a, 'b> {
354 self.result = self.result.and_then(|_| {
355 if self.is_pretty() {
356 let mut writer = PadAdapter::new(self.fmt);
357 let prefix = if self.has_fields {
362 fmt::write(&mut writer,
363 format_args!("{}\n{:#?}: {:#?}", prefix, key, value))
365 let prefix = if self.has_fields {
370 write!(self.fmt, "{}{:?}: {:?}", prefix, key, value)
374 self.has_fields = true;
378 /// Adds the contents of an iterator of entries to the map output.
379 #[stable(feature = "debug_builders", since = "1.2.0")]
380 pub fn entries<K, V, I>(&mut self, entries: I) -> &mut DebugMap<'a, 'b>
383 I: IntoIterator<Item = (K, V)>
385 for (k, v) in entries {
391 /// Finishes output and returns any error encountered.
392 #[stable(feature = "debug_builders", since = "1.2.0")]
393 pub fn finish(&mut self) -> fmt::Result {
394 let prefix = if self.is_pretty() && self.has_fields {
399 self.result.and_then(|_| write!(self.fmt, "{}}}", prefix))
402 fn is_pretty(&self) -> bool {
403 self.fmt.flags() & (1 << (FlagV1::Alternate as usize)) != 0