Auto merge of #23162 - sfackler:debug-builders, r=alexcrichton
I've made some minor changes from the implementation attached to the RFC to try to minimize codegen. The methods now take `&Debug` trait objects rather than being parameterized and there are inlined stub methods that call to non-inlined methods to do the work. r? @alexcrichton cc @huonw for the `derive(Debug)` changes.
This commit is contained in:
bors
commit
49f7550a25
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@ -0,0 +1,301 @@
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// 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 prelude::*;
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use fmt::{self, Write, FlagV1};
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struct PadAdapter<'a, 'b: 'a> {
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fmt: &'a mut fmt::Formatter<'b>,
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on_newline: bool,
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}
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impl<'a, 'b: 'a> PadAdapter<'a, 'b> {
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fn new(fmt: &'a mut fmt::Formatter<'b>) -> PadAdapter<'a, 'b> {
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PadAdapter {
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fmt: fmt,
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on_newline: false,
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}
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}
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}
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impl<'a, 'b: 'a> fmt::Write for PadAdapter<'a, 'b> {
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fn write_str(&mut self, mut s: &str) -> fmt::Result {
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while !s.is_empty() {
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if self.on_newline {
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try!(self.fmt.write_str(" "));
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}
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let split = match s.find('\n') {
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Some(pos) => {
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self.on_newline = true;
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pos + 1
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}
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None => {
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self.on_newline = false;
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s.len()
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}
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};
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try!(self.fmt.write_str(&s[..split]));
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s = &s[split..];
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}
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Ok(())
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}
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}
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/// A struct to help with `fmt::Debug` implementations.
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///
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/// Constructed by the `Formatter::debug_struct` method.
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#[must_use]
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pub struct DebugStruct<'a, 'b: 'a> {
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fmt: &'a mut fmt::Formatter<'b>,
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result: fmt::Result,
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has_fields: bool,
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}
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pub fn debug_struct_new<'a, 'b>(fmt: &'a mut fmt::Formatter<'b>, name: &str)
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-> DebugStruct<'a, 'b> {
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let result = fmt.write_str(name);
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DebugStruct {
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fmt: fmt,
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result: result,
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has_fields: false,
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}
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}
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impl<'a, 'b: 'a> DebugStruct<'a, 'b> {
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/// Adds a new field to the generated struct output.
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#[unstable(feature = "debug_builders", reason = "method was just created")]
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pub fn field(mut self, name: &str, value: &fmt::Debug) -> DebugStruct<'a, 'b> {
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self.result = self.result.and_then(|_| {
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let prefix = if self.has_fields {
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","
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} else {
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" {"
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};
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if self.is_pretty() {
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let mut writer = PadAdapter::new(self.fmt);
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fmt::write(&mut writer, format_args!("{}\n{}: {:#?}", prefix, name, value))
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} else {
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write!(self.fmt, "{} {}: {:?}", prefix, name, value)
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}
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});
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self.has_fields = true;
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self
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}
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/// Consumes the `DebugStruct`, finishing output and returning any error
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/// encountered.
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#[unstable(feature = "debug_builders", reason = "method was just created")]
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pub fn finish(mut self) -> fmt::Result {
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if self.has_fields {
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self.result = self.result.and_then(|_| {
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if self.is_pretty() {
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self.fmt.write_str("\n}")
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} else {
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self.fmt.write_str(" }")
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}
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});
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}
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self.result
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}
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fn is_pretty(&self) -> bool {
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self.fmt.flags() & (1 << (FlagV1::Alternate as usize)) != 0
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}
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}
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/// A struct to help with `fmt::Debug` implementations.
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///
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/// Constructed by the `Formatter::debug_tuple` method.
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#[must_use]
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pub struct DebugTuple<'a, 'b: 'a> {
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fmt: &'a mut fmt::Formatter<'b>,
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result: fmt::Result,
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has_fields: bool,
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}
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pub fn debug_tuple_new<'a, 'b>(fmt: &'a mut fmt::Formatter<'b>, name: &str) -> DebugTuple<'a, 'b> {
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let result = fmt.write_str(name);
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DebugTuple {
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fmt: fmt,
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result: result,
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has_fields: false,
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}
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}
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impl<'a, 'b: 'a> DebugTuple<'a, 'b> {
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/// Adds a new field to the generated tuple struct output.
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#[unstable(feature = "debug_builders", reason = "method was just created")]
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pub fn field(mut self, value: &fmt::Debug) -> DebugTuple<'a, 'b> {
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self.result = self.result.and_then(|_| {
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let (prefix, space) = if self.has_fields {
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(",", " ")
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} else {
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("(", "")
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};
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if self.is_pretty() {
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let mut writer = PadAdapter::new(self.fmt);
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fmt::write(&mut writer, format_args!("{}\n{:#?}", prefix, value))
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} else {
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write!(self.fmt, "{}{}{:?}", prefix, space, value)
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}
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});
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self.has_fields = true;
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self
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}
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/// Consumes the `DebugTuple`, finishing output and returning any error
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/// encountered.
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#[unstable(feature = "debug_builders", reason = "method was just created")]
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pub fn finish(mut self) -> fmt::Result {
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if self.has_fields {
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self.result = self.result.and_then(|_| {
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if self.is_pretty() {
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self.fmt.write_str("\n)")
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} else {
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self.fmt.write_str(")")
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}
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});
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}
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self.result
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}
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fn is_pretty(&self) -> bool {
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self.fmt.flags() & (1 << (FlagV1::Alternate as usize)) != 0
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}
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}
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/// A struct to help with `fmt::Debug` implementations.
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///
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/// Constructed by the `Formatter::debug_set` method.
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#[must_use]
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pub struct DebugSet<'a, 'b: 'a> {
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fmt: &'a mut fmt::Formatter<'b>,
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result: fmt::Result,
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has_fields: bool,
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}
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pub fn debug_set_new<'a, 'b>(fmt: &'a mut fmt::Formatter<'b>, name: &str) -> DebugSet<'a, 'b> {
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let result = write!(fmt, "{} {{", name);
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DebugSet {
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fmt: fmt,
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result: result,
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has_fields: false,
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}
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}
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impl<'a, 'b: 'a> DebugSet<'a, 'b> {
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/// Adds a new entry to the set output.
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#[unstable(feature = "debug_builders", reason = "method was just created")]
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pub fn entry(mut self, entry: &fmt::Debug) -> DebugSet<'a, 'b> {
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self.result = self.result.and_then(|_| {
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let prefix = if self.has_fields {
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","
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} else {
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""
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};
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if self.is_pretty() {
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let mut writer = PadAdapter::new(self.fmt);
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fmt::write(&mut writer, format_args!("{}\n{:#?}", prefix, entry))
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} else {
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write!(self.fmt, "{} {:?}", prefix, entry)
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||||
}
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||||
});
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self.has_fields = true;
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self
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}
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/// Consumes the `DebugSet`, finishing output and returning any error
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/// encountered.
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#[unstable(feature = "debug_builders", reason = "method was just created")]
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pub fn finish(self) -> fmt::Result {
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self.result.and_then(|_| {
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let end = match (self.has_fields, self.is_pretty()) {
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(false, _) => "}",
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(true, false) => " }",
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(true, true) => "\n}",
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};
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self.fmt.write_str(end)
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})
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}
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fn is_pretty(&self) -> bool {
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self.fmt.flags() & (1 << (FlagV1::Alternate as usize)) != 0
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}
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}
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/// A struct to help with `fmt::Debug` implementations.
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///
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/// Constructed by the `Formatter::debug_map` method.
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#[must_use]
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pub struct DebugMap<'a, 'b: 'a> {
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fmt: &'a mut fmt::Formatter<'b>,
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result: fmt::Result,
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has_fields: bool,
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}
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pub fn debug_map_new<'a, 'b>(fmt: &'a mut fmt::Formatter<'b>, name: &str) -> DebugMap<'a, 'b> {
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let result = write!(fmt, "{} {{", name);
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DebugMap {
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fmt: fmt,
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result: result,
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has_fields: false,
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}
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}
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impl<'a, 'b: 'a> DebugMap<'a, 'b> {
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/// Adds a new entry to the map output.
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#[unstable(feature = "debug_builders", reason = "method was just created")]
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pub fn entry(mut self, key: &fmt::Debug, value: &fmt::Debug) -> DebugMap<'a, 'b> {
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self.result = self.result.and_then(|_| {
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let prefix = if self.has_fields {
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","
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} else {
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""
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};
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if self.is_pretty() {
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let mut writer = PadAdapter::new(self.fmt);
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fmt::write(&mut writer, format_args!("{}\n{:#?}: {:#?}", prefix, key, value))
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} else {
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write!(self.fmt, "{} {:?}: {:?}", prefix, key, value)
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}
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});
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self.has_fields = true;
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|
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self
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}
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/// Consumes the `DebugMap`, finishing output and returning any error
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/// encountered.
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#[unstable(feature = "debug_builders", reason = "method was just created")]
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pub fn finish(self) -> fmt::Result {
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self.result.and_then(|_| {
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let end = match (self.has_fields, self.is_pretty()) {
|
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(false, _) => "}",
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||||
(true, false) => " }",
|
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(true, true) => "\n}",
|
||||
};
|
||||
self.fmt.write_str(end)
|
||||
})
|
||||
}
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||||
|
||||
fn is_pretty(&self) -> bool {
|
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self.fmt.flags() & (1 << (FlagV1::Alternate as usize)) != 0
|
||||
}
|
||||
}
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|
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@ -32,8 +32,11 @@ pub use self::num::radix;
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pub use self::num::Radix;
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pub use self::num::RadixFmt;
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pub use self::builders::{DebugStruct, DebugTuple, DebugSet, DebugMap};
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mod num;
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mod float;
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mod builders;
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#[stable(feature = "rust1", since = "1.0.0")]
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#[doc(hidden)]
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|
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@ -425,7 +428,7 @@ impl<'a> Formatter<'a> {
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|||
/// # Arguments
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||||
///
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/// * is_positive - whether the original integer was positive or not.
|
||||
/// * prefix - if the '#' character (FlagAlternate) is provided, this
|
||||
/// * prefix - if the '#' character (Alternate) is provided, this
|
||||
/// is the prefix to put in front of the number.
|
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/// * buf - the byte array that the number has been formatted into
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///
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|
|
@ -614,6 +617,123 @@ impl<'a> Formatter<'a> {
|
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/// Optionally specified precision for numeric types
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#[unstable(feature = "core", reason = "method was just created")]
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pub fn precision(&self) -> Option<usize> { self.precision }
|
||||
|
||||
/// Creates a `DebugStruct` builder designed to assist with creation of
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/// `fmt::Debug` implementations for structs.
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///
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||||
/// # Examples
|
||||
///
|
||||
/// ```rust
|
||||
/// use std::fmt;
|
||||
///
|
||||
/// struct Foo {
|
||||
/// bar: i32,
|
||||
/// baz: String,
|
||||
/// }
|
||||
///
|
||||
/// impl fmt::Debug for Foo {
|
||||
/// fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
/// fmt.debug_struct("Foo")
|
||||
/// .field("bar", &self.bar)
|
||||
/// .field("baz", &self.baz)
|
||||
/// .finish()
|
||||
/// }
|
||||
/// }
|
||||
///
|
||||
/// // prints "Foo { bar: 10, baz: "Hello World" }"
|
||||
/// println!("{:?}", Foo { bar: 10, baz: "Hello World".to_string() });
|
||||
/// ```
|
||||
#[unstable(feature = "core", reason = "method was just created")]
|
||||
#[inline]
|
||||
pub fn debug_struct<'b>(&'b mut self, name: &str) -> DebugStruct<'b, 'a> {
|
||||
builders::debug_struct_new(self, name)
|
||||
}
|
||||
|
||||
/// Creates a `DebugTuple` builder designed to assist with creation of
|
||||
/// `fmt::Debug` implementations for tuple structs.
|
||||
///
|
||||
/// # Examples
|
||||
///
|
||||
/// ```rust
|
||||
/// use std::fmt;
|
||||
///
|
||||
/// struct Foo(i32, String);
|
||||
///
|
||||
/// impl fmt::Debug for Foo {
|
||||
/// fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
/// fmt.debug_tuple("Foo")
|
||||
/// .field(&self.0)
|
||||
/// .field(&self.1)
|
||||
/// .finish()
|
||||
/// }
|
||||
/// }
|
||||
///
|
||||
/// // prints "Foo(10, "Hello World")"
|
||||
/// println!("{:?}", Foo(10, "Hello World".to_string()));
|
||||
/// ```
|
||||
#[unstable(feature = "core", reason = "method was just created")]
|
||||
#[inline]
|
||||
pub fn debug_tuple<'b>(&'b mut self, name: &str) -> DebugTuple<'b, 'a> {
|
||||
builders::debug_tuple_new(self, name)
|
||||
}
|
||||
|
||||
/// Creates a `DebugSet` builder designed to assist with creation of
|
||||
/// `fmt::Debug` implementations for set-like structures.
|
||||
///
|
||||
/// # Examples
|
||||
///
|
||||
/// ```rust
|
||||
/// use std::fmt;
|
||||
///
|
||||
/// struct Foo(Vec<i32>);
|
||||
///
|
||||
/// impl fmt::Debug for Foo {
|
||||
/// fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
/// let mut builder = fmt.debug_set("Foo");
|
||||
/// for i in &self.0 {
|
||||
/// builder = builder.entry(i);
|
||||
/// }
|
||||
/// builder.finish()
|
||||
/// }
|
||||
/// }
|
||||
///
|
||||
/// // prints "Foo { 10, 11 }"
|
||||
/// println!("{:?}", Foo(vec![10, 11]));
|
||||
/// ```
|
||||
#[unstable(feature = "core", reason = "method was just created")]
|
||||
#[inline]
|
||||
pub fn debug_set<'b>(&'b mut self, name: &str) -> DebugSet<'b, 'a> {
|
||||
builders::debug_set_new(self, name)
|
||||
}
|
||||
|
||||
/// Creates a `DebugMap` builder designed to assist with creation of
|
||||
/// `fmt::Debug` implementations for map-like structures.
|
||||
///
|
||||
/// # Examples
|
||||
///
|
||||
/// ```rust
|
||||
/// use std::fmt;
|
||||
///
|
||||
/// struct Foo(Vec<(String, i32)>);
|
||||
///
|
||||
/// impl fmt::Debug for Foo {
|
||||
/// fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
/// let mut builder = fmt.debug_map("Foo");
|
||||
/// for &(ref key, ref value) in &self.0 {
|
||||
/// builder = builder.entry(key, value);
|
||||
/// }
|
||||
/// builder.finish()
|
||||
/// }
|
||||
/// }
|
||||
///
|
||||
/// // prints "Foo { "A": 10, "B": 11 }"
|
||||
/// println!("{:?}", Foo(vec![("A".to_string(), 10), ("B".to_string(), 11)]));
|
||||
/// ```
|
||||
#[unstable(feature = "core", reason = "method was just created")]
|
||||
#[inline]
|
||||
pub fn debug_map<'b>(&'b mut self, name: &str) -> DebugMap<'b, 'a> {
|
||||
builders::debug_map_new(self, name)
|
||||
}
|
||||
}
|
||||
|
||||
#[stable(feature = "rust1", since = "1.0.0")]
|
||||
|
|
|
|||
|
|
@ -0,0 +1,401 @@
|
|||
// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
|
||||
// file at the top-level directory of this distribution and at
|
||||
// http://rust-lang.org/COPYRIGHT.
|
||||
//
|
||||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
||||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
||||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
||||
// option. This file may not be copied, modified, or distributed
|
||||
// except according to those terms.
|
||||
|
||||
mod debug_struct {
|
||||
use std::fmt;
|
||||
|
||||
#[test]
|
||||
fn test_empty() {
|
||||
struct Foo;
|
||||
|
||||
impl fmt::Debug for Foo {
|
||||
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
fmt.debug_struct("Foo").finish()
|
||||
}
|
||||
}
|
||||
|
||||
assert_eq!("Foo", format!("{:?}", Foo));
|
||||
assert_eq!("Foo", format!("{:#?}", Foo));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_single() {
|
||||
struct Foo;
|
||||
|
||||
impl fmt::Debug for Foo {
|
||||
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
fmt.debug_struct("Foo")
|
||||
.field("bar", &true)
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
assert_eq!("Foo { bar: true }", format!("{:?}", Foo));
|
||||
assert_eq!(
|
||||
"Foo {
|
||||
bar: true
|
||||
}",
|
||||
format!("{:#?}", Foo));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_multiple() {
|
||||
struct Foo;
|
||||
|
||||
impl fmt::Debug for Foo {
|
||||
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
fmt.debug_struct("Foo")
|
||||
.field("bar", &true)
|
||||
.field("baz", &format_args!("{}/{}", 10i32, 20i32))
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
assert_eq!("Foo { bar: true, baz: 10/20 }", format!("{:?}", Foo));
|
||||
assert_eq!(
|
||||
"Foo {
|
||||
bar: true,
|
||||
baz: 10/20
|
||||
}",
|
||||
format!("{:#?}", Foo));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_nested() {
|
||||
struct Foo;
|
||||
|
||||
impl fmt::Debug for Foo {
|
||||
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
fmt.debug_struct("Foo")
|
||||
.field("bar", &true)
|
||||
.field("baz", &format_args!("{}/{}", 10i32, 20i32))
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
struct Bar;
|
||||
|
||||
impl fmt::Debug for Bar {
|
||||
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
fmt.debug_struct("Bar")
|
||||
.field("foo", &Foo)
|
||||
.field("hello", &"world")
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
assert_eq!("Bar { foo: Foo { bar: true, baz: 10/20 }, hello: \"world\" }",
|
||||
format!("{:?}", Bar));
|
||||
assert_eq!(
|
||||
"Bar {
|
||||
foo: Foo {
|
||||
bar: true,
|
||||
baz: 10/20
|
||||
},
|
||||
hello: \"world\"
|
||||
}",
|
||||
format!("{:#?}", Bar));
|
||||
}
|
||||
}
|
||||
|
||||
mod debug_tuple {
|
||||
use std::fmt;
|
||||
|
||||
#[test]
|
||||
fn test_empty() {
|
||||
struct Foo;
|
||||
|
||||
impl fmt::Debug for Foo {
|
||||
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
fmt.debug_tuple("Foo").finish()
|
||||
}
|
||||
}
|
||||
|
||||
assert_eq!("Foo", format!("{:?}", Foo));
|
||||
assert_eq!("Foo", format!("{:#?}", Foo));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_single() {
|
||||
struct Foo;
|
||||
|
||||
impl fmt::Debug for Foo {
|
||||
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
fmt.debug_tuple("Foo")
|
||||
.field(&true)
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
assert_eq!("Foo(true)", format!("{:?}", Foo));
|
||||
assert_eq!(
|
||||
"Foo(
|
||||
true
|
||||
)",
|
||||
format!("{:#?}", Foo));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_multiple() {
|
||||
struct Foo;
|
||||
|
||||
impl fmt::Debug for Foo {
|
||||
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
fmt.debug_tuple("Foo")
|
||||
.field(&true)
|
||||
.field(&format_args!("{}/{}", 10i32, 20i32))
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
assert_eq!("Foo(true, 10/20)", format!("{:?}", Foo));
|
||||
assert_eq!(
|
||||
"Foo(
|
||||
true,
|
||||
10/20
|
||||
)",
|
||||
format!("{:#?}", Foo));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_nested() {
|
||||
struct Foo;
|
||||
|
||||
impl fmt::Debug for Foo {
|
||||
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
fmt.debug_tuple("Foo")
|
||||
.field(&true)
|
||||
.field(&format_args!("{}/{}", 10i32, 20i32))
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
struct Bar;
|
||||
|
||||
impl fmt::Debug for Bar {
|
||||
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
fmt.debug_tuple("Bar")
|
||||
.field(&Foo)
|
||||
.field(&"world")
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
assert_eq!("Bar(Foo(true, 10/20), \"world\")",
|
||||
format!("{:?}", Bar));
|
||||
assert_eq!(
|
||||
"Bar(
|
||||
Foo(
|
||||
true,
|
||||
10/20
|
||||
),
|
||||
\"world\"
|
||||
)",
|
||||
format!("{:#?}", Bar));
|
||||
}
|
||||
}
|
||||
|
||||
mod debug_map {
|
||||
use std::fmt;
|
||||
|
||||
#[test]
|
||||
fn test_empty() {
|
||||
struct Foo;
|
||||
|
||||
impl fmt::Debug for Foo {
|
||||
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
fmt.debug_map("Foo").finish()
|
||||
}
|
||||
}
|
||||
|
||||
assert_eq!("Foo {}", format!("{:?}", Foo));
|
||||
assert_eq!("Foo {}", format!("{:#?}", Foo));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_single() {
|
||||
struct Foo;
|
||||
|
||||
impl fmt::Debug for Foo {
|
||||
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
fmt.debug_map("Foo")
|
||||
.entry(&"bar", &true)
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
assert_eq!("Foo { \"bar\": true }", format!("{:?}", Foo));
|
||||
assert_eq!(
|
||||
"Foo {
|
||||
\"bar\": true
|
||||
}",
|
||||
format!("{:#?}", Foo));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_multiple() {
|
||||
struct Foo;
|
||||
|
||||
impl fmt::Debug for Foo {
|
||||
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
fmt.debug_map("Foo")
|
||||
.entry(&"bar", &true)
|
||||
.entry(&10i32, &format_args!("{}/{}", 10i32, 20i32))
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
assert_eq!("Foo { \"bar\": true, 10: 10/20 }", format!("{:?}", Foo));
|
||||
assert_eq!(
|
||||
"Foo {
|
||||
\"bar\": true,
|
||||
10: 10/20
|
||||
}",
|
||||
format!("{:#?}", Foo));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_nested() {
|
||||
struct Foo;
|
||||
|
||||
impl fmt::Debug for Foo {
|
||||
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
fmt.debug_map("Foo")
|
||||
.entry(&"bar", &true)
|
||||
.entry(&10i32, &format_args!("{}/{}", 10i32, 20i32))
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
struct Bar;
|
||||
|
||||
impl fmt::Debug for Bar {
|
||||
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
fmt.debug_map("Bar")
|
||||
.entry(&"foo", &Foo)
|
||||
.entry(&Foo, &"world")
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
assert_eq!("Bar { \"foo\": Foo { \"bar\": true, 10: 10/20 }, \
|
||||
Foo { \"bar\": true, 10: 10/20 }: \"world\" }",
|
||||
format!("{:?}", Bar));
|
||||
assert_eq!(
|
||||
"Bar {
|
||||
\"foo\": Foo {
|
||||
\"bar\": true,
|
||||
10: 10/20
|
||||
},
|
||||
Foo {
|
||||
\"bar\": true,
|
||||
10: 10/20
|
||||
}: \"world\"
|
||||
}",
|
||||
format!("{:#?}", Bar));
|
||||
}
|
||||
}
|
||||
|
||||
mod debug_set {
|
||||
use std::fmt;
|
||||
|
||||
#[test]
|
||||
fn test_empty() {
|
||||
struct Foo;
|
||||
|
||||
impl fmt::Debug for Foo {
|
||||
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
fmt.debug_set("Foo").finish()
|
||||
}
|
||||
}
|
||||
|
||||
assert_eq!("Foo {}", format!("{:?}", Foo));
|
||||
assert_eq!("Foo {}", format!("{:#?}", Foo));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_single() {
|
||||
struct Foo;
|
||||
|
||||
impl fmt::Debug for Foo {
|
||||
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
fmt.debug_set("Foo")
|
||||
.entry(&true)
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
assert_eq!("Foo { true }", format!("{:?}", Foo));
|
||||
assert_eq!(
|
||||
"Foo {
|
||||
true
|
||||
}",
|
||||
format!("{:#?}", Foo));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_multiple() {
|
||||
struct Foo;
|
||||
|
||||
impl fmt::Debug for Foo {
|
||||
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
fmt.debug_set("Foo")
|
||||
.entry(&true)
|
||||
.entry(&format_args!("{}/{}", 10i32, 20i32))
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
assert_eq!("Foo { true, 10/20 }", format!("{:?}", Foo));
|
||||
assert_eq!(
|
||||
"Foo {
|
||||
true,
|
||||
10/20
|
||||
}",
|
||||
format!("{:#?}", Foo));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_nested() {
|
||||
struct Foo;
|
||||
|
||||
impl fmt::Debug for Foo {
|
||||
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
fmt.debug_set("Foo")
|
||||
.entry(&true)
|
||||
.entry(&format_args!("{}/{}", 10i32, 20i32))
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
struct Bar;
|
||||
|
||||
impl fmt::Debug for Bar {
|
||||
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
|
||||
fmt.debug_set("Bar")
|
||||
.entry(&Foo)
|
||||
.entry(&"world")
|
||||
.finish()
|
||||
}
|
||||
}
|
||||
|
||||
assert_eq!("Bar { Foo { true, 10/20 }, \"world\" }",
|
||||
format!("{:?}", Bar));
|
||||
assert_eq!(
|
||||
"Bar {
|
||||
Foo {
|
||||
true,
|
||||
10/20
|
||||
},
|
||||
\"world\"
|
||||
}",
|
||||
format!("{:#?}", Bar));
|
||||
}
|
||||
}
|
||||
|
|
@ -9,6 +9,7 @@
|
|||
// except according to those terms.
|
||||
|
||||
mod num;
|
||||
mod builders;
|
||||
|
||||
#[test]
|
||||
fn test_format_flags() {
|
||||
|
|
|
|||
|
|
@ -23,6 +23,7 @@
|
|||
#![feature(hash)]
|
||||
#![feature(io)]
|
||||
#![feature(collections)]
|
||||
#![feature(debug_builders)]
|
||||
#![allow(deprecated)] // rand
|
||||
|
||||
extern crate core;
|
||||
|
|
|
|||
|
|
@ -848,7 +848,7 @@ impl CodeMap {
|
|||
|
||||
let span_comes_from_this_expansion =
|
||||
info.callee.span.map_or(span == info.call_site, |mac_span| {
|
||||
mac_span.lo <= span.lo && span.hi < mac_span.hi
|
||||
mac_span.lo <= span.lo && span.hi <= mac_span.hi
|
||||
});
|
||||
|
||||
debug!("span_allows_unstable: from this expansion? {}, allows unstable? {}",
|
||||
|
|
|
|||
|
|
@ -11,7 +11,6 @@
|
|||
use ast;
|
||||
use ast::{MetaItem, Item, Expr,};
|
||||
use codemap::Span;
|
||||
use ext::format;
|
||||
use ext::base::ExtCtxt;
|
||||
use ext::build::AstBuilder;
|
||||
use ext::deriving::generic::*;
|
||||
|
|
@ -19,8 +18,6 @@ use ext::deriving::generic::ty::*;
|
|||
use parse::token;
|
||||
use ptr::P;
|
||||
|
||||
use std::collections::HashMap;
|
||||
|
||||
pub fn expand_deriving_show<F>(cx: &mut ExtCtxt,
|
||||
span: Span,
|
||||
mitem: &MetaItem,
|
||||
|
|
@ -56,14 +53,12 @@ pub fn expand_deriving_show<F>(cx: &mut ExtCtxt,
|
|||
trait_def.expand(cx, mitem, item, push)
|
||||
}
|
||||
|
||||
/// We construct a format string and then defer to std::fmt, since that
|
||||
/// knows what's up with formatting and so on.
|
||||
/// We use the debug builders to do the heavy lifting here
|
||||
fn show_substructure(cx: &mut ExtCtxt, span: Span,
|
||||
substr: &Substructure) -> P<Expr> {
|
||||
// build `<name>`, `<name>({}, {}, ...)` or `<name> { <field>: {},
|
||||
// <field>: {}, ... }` based on the "shape".
|
||||
//
|
||||
// Easy start: they all start with the name.
|
||||
// build fmt.debug_struct(<name>).field(<fieldname>, &<fieldval>)....build()
|
||||
// or fmt.debug_tuple(<name>).field(&<fieldval>)....build()
|
||||
// based on the "shape".
|
||||
let name = match *substr.fields {
|
||||
Struct(_) => substr.type_ident,
|
||||
EnumMatching(_, v, _) => v.node.name,
|
||||
|
|
@ -72,70 +67,53 @@ fn show_substructure(cx: &mut ExtCtxt, span: Span,
|
|||
}
|
||||
};
|
||||
|
||||
let mut format_string = String::from_str(&token::get_ident(name));
|
||||
// the internal fields we're actually formatting
|
||||
let mut exprs = Vec::new();
|
||||
// We want to make sure we have the expn_id set so that we can use unstable methods
|
||||
let span = Span { expn_id: cx.backtrace(), .. span };
|
||||
let name = cx.expr_lit(span, ast::Lit_::LitStr(token::get_ident(name),
|
||||
ast::StrStyle::CookedStr));
|
||||
let mut expr = substr.nonself_args[0].clone();
|
||||
|
||||
// Getting harder... making the format string:
|
||||
match *substr.fields {
|
||||
// unit struct/nullary variant: no work necessary!
|
||||
Struct(ref fields) if fields.len() == 0 => {}
|
||||
EnumMatching(_, _, ref fields) if fields.len() == 0 => {}
|
||||
|
||||
Struct(ref fields) | EnumMatching(_, _, ref fields) => {
|
||||
if fields[0].name.is_none() {
|
||||
if fields.is_empty() || fields[0].name.is_none() {
|
||||
// tuple struct/"normal" variant
|
||||
expr = cx.expr_method_call(span,
|
||||
expr,
|
||||
token::str_to_ident("debug_tuple"),
|
||||
vec![name]);
|
||||
|
||||
format_string.push_str("(");
|
||||
|
||||
for (i, field) in fields.iter().enumerate() {
|
||||
if i != 0 { format_string.push_str(", "); }
|
||||
|
||||
format_string.push_str("{:?}");
|
||||
|
||||
exprs.push(field.self_.clone());
|
||||
for field in fields {
|
||||
expr = cx.expr_method_call(span,
|
||||
expr,
|
||||
token::str_to_ident("field"),
|
||||
vec![cx.expr_addr_of(field.span,
|
||||
field.self_.clone())]);
|
||||
}
|
||||
|
||||
format_string.push_str(")");
|
||||
} else {
|
||||
// normal struct/struct variant
|
||||
expr = cx.expr_method_call(span,
|
||||
expr,
|
||||
token::str_to_ident("debug_struct"),
|
||||
vec![name]);
|
||||
|
||||
format_string.push_str(" {{");
|
||||
|
||||
for (i, field) in fields.iter().enumerate() {
|
||||
if i != 0 { format_string.push_str(","); }
|
||||
|
||||
let name = token::get_ident(field.name.unwrap());
|
||||
format_string.push_str(" ");
|
||||
format_string.push_str(&name);
|
||||
format_string.push_str(": {:?}");
|
||||
|
||||
exprs.push(field.self_.clone());
|
||||
for field in fields {
|
||||
let name = cx.expr_lit(field.span, ast::Lit_::LitStr(
|
||||
token::get_ident(field.name.clone().unwrap()),
|
||||
ast::StrStyle::CookedStr));
|
||||
expr = cx.expr_method_call(span,
|
||||
expr,
|
||||
token::str_to_ident("field"),
|
||||
vec![name,
|
||||
cx.expr_addr_of(field.span,
|
||||
field.self_.clone())]);
|
||||
}
|
||||
|
||||
format_string.push_str(" }}");
|
||||
}
|
||||
}
|
||||
_ => unreachable!()
|
||||
}
|
||||
|
||||
// AST construction!
|
||||
// we're basically calling
|
||||
//
|
||||
// format_arg_method!(fmt, write_fmt, "<format_string>", exprs...)
|
||||
//
|
||||
// but doing it directly via ext::format.
|
||||
let formatter = substr.nonself_args[0].clone();
|
||||
|
||||
let meth = cx.ident_of("write_fmt");
|
||||
let s = token::intern_and_get_ident(&format_string[..]);
|
||||
let format_string = cx.expr_str(span, s);
|
||||
|
||||
// phew, not our responsibility any more!
|
||||
|
||||
let args = vec![
|
||||
format::expand_preparsed_format_args(cx, span, format_string,
|
||||
exprs, vec![], HashMap::new())
|
||||
];
|
||||
cx.expr_method_call(span, formatter, meth, args)
|
||||
cx.expr_method_call(span,
|
||||
expr,
|
||||
token::str_to_ident("finish"),
|
||||
vec![])
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1121,7 +1121,7 @@ fn expand_annotatable(a: Annotatable,
|
|||
callee: NameAndSpan {
|
||||
name: mname.to_string(),
|
||||
format: MacroAttribute,
|
||||
span: None,
|
||||
span: Some(attr.span),
|
||||
// attributes can do whatever they like,
|
||||
// for now.
|
||||
allow_internal_unstable: true,
|
||||
|
|
|
|||
Loading…
Reference in New Issue