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    use std::{borrow::Cow, io, io::prelude::Write};

    use super::OutputFormatter;
    use crate::{
        console::{ConsoleTestState, OutputLocation},
        test_result::TestResult,
        time,
        types::TestDesc,
    };

    pub(crate) struct JsonFormatter<T> {
        out: OutputLocation<T>,
    }

    impl<T: Write> JsonFormatter<T> {
        pub fn new(out: OutputLocation<T>) -> Self {
            Self { out }
        }

        fn writeln_message(&mut self, s: &str) -> io::Result<()> {
            assert!(!s.contains('\n'));

            self.out.write_all(s.as_ref())?;
            self.out.write_all(b"\n")
        }

        fn write_message(&mut self, s: &str) -> io::Result<()> {
            assert!(!s.contains('\n'));

            self.out.write_all(s.as_ref())
        }

        fn write_event(
            &mut self,
            ty: &str,
            name: &str,
            evt: &str,
            exec_time: Option<&time::TestExecTime>,
            stdout: Option<Cow<'_, str>>,
            extra: Option<&str>,
        ) -> io::Result<()> {
            self.write_message(&*format!(
                r#"{{ "type": "{}", "name": "{}", "event": "{}""#,
                ty, name, evt
            ))?;
            if let Some(exec_time) = exec_time {
                self.write_message(&*format!(r#", "exec_time": "{}""#, exec_time))?;
            }
            if let Some(stdout) = stdout {
                self.write_message(&*format!(r#", "stdout": "{}""#, EscapedString(stdout)))?;
            }
            if let Some(extra) = extra {
                self.write_message(&*format!(r#", {}"#, extra))?;
            }
            self.writeln_message(" }")
        }
    }

    impl<T: Write> OutputFormatter for JsonFormatter<T> {
        fn write_run_start(&mut self, test_count: usize) -> io::Result<()> {
            self.writeln_message(&*format!(
                r#"{{ "type": "suite", "event": "started", "test_count": {} }}"#,
                test_count
            ))
        }

        fn write_test_start(&mut self, desc: &TestDesc) -> io::Result<()> {
            self.writeln_message(&*format!(
                r#"{{ "type": "test", "event": "started", "name": "{}" }}"#,
                desc.name
            ))
        }

        fn write_result(
            &mut self,
            desc: &TestDesc,
            result: &TestResult,
            exec_time: Option<&time::TestExecTime>,
            stdout: &[u8],
            state: &ConsoleTestState,
        ) -> io::Result<()> {
            let display_stdout = state.options.display_output || *result != TestResult::TrOk;
            let stdout = if display_stdout && !stdout.is_empty() {
                Some(String::from_utf8_lossy(stdout))
            } else {
                None
            };
            match *result {
                TestResult::TrOk => {
                    self.write_event("test", desc.name.as_slice(), "ok", exec_time, stdout, None)
                }

                TestResult::TrFailed => {
                    self.write_event("test", desc.name.as_slice(), "failed", exec_time, stdout, None)
                }

                TestResult::TrTimedFail => self.write_event(
                    "test",
                    desc.name.as_slice(),
                    "failed",
                    exec_time,
                    stdout,
                    Some(r#""reason": "time limit exceeded""#),
                ),

                TestResult::TrFailedMsg(ref m) => self.write_event(
                    "test",
                    desc.name.as_slice(),
                    "failed",
                    exec_time,
                    stdout,
                    Some(&*format!(r#""message": "{}""#, EscapedString(m))),
                ),

                TestResult::TrIgnored => {
                    self.write_event("test", desc.name.as_slice(), "ignored", exec_time, stdout, None)
                }

                TestResult::TrAllowedFail => self.write_event(
                    "test",
                    desc.name.as_slice(),
                    "allowed_failure",
                    exec_time,
                    stdout,
                    None,
                ),

                TestResult::TrBench(ref bs) => {
                    let median = bs.ns_iter_summ.median as usize;
                    let deviation = (bs.ns_iter_summ.max - bs.ns_iter_summ.min) as usize;

                    let mbps = if bs.mb_s == 0 {
                        String::new()
                    } else {
                        format!(r#", "mib_per_second": {}"#, bs.mb_s)
                    };

                    let line = format!(
                        "{{ \"type\": \"bench\", \
                         \"name\": \"{}\", \
                         \"median\": {}, \
                         \"deviation\": {}{} }}",
                        desc.name, median, deviation, mbps
                    );

                    self.writeln_message(&*line)
                }
            }
        }

        fn write_timeout(&mut self, desc: &TestDesc) -> io::Result<()> {
            self.writeln_message(&*format!(
                r#"{{ "type": "test", "event": "timeout", "name": "{}" }}"#,
                desc.name
            ))
        }

        fn write_run_finish(&mut self, state: &ConsoleTestState) -> io::Result<bool> {
            self.writeln_message(&*format!(
                "{{ \"type\": \"suite\", \
                 \"event\": \"{}\", \
                 \"passed\": {}, \
                 \"failed\": {}, \
                 \"allowed_fail\": {}, \
                 \"ignored\": {}, \
                 \"measured\": {}, \
                 \"filtered_out\": {} }}",
                if state.failed == 0 { "ok" } else { "failed" },
                state.passed,
                state.failed + state.allowed_fail,
                state.allowed_fail,
                state.ignored,
                state.measured,
                state.filtered_out
            ))?;

            Ok(state.failed == 0)
        }
    }

    /// A formatting utility used to print strings with characters in need of escaping.
    /// Base code taken form `libserialize::json::escape_str`
    struct EscapedString<S: AsRef<str>>(S);

    impl<S: AsRef<str>> ::std::fmt::Display for EscapedString<S> {
        fn fmt(&self, f: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
            let mut start = 0;

            for (i, byte) in self.0.as_ref().bytes().enumerate() {
                let escaped = match byte {
                    b'"' => "\\\"",
                    b'\\' => "\\\\",
                    b'\x00' => "\\u0000",
                    b'\x01' => "\\u0001",
                    b'\x02' => "\\u0002",
                    b'\x03' => "\\u0003",
                    b'\x04' => "\\u0004",
                    b'\x05' => "\\u0005",
                    b'\x06' => "\\u0006",
                    b'\x07' => "\\u0007",
                    b'\x08' => "\\b",
                    b'\t' => "\\t",
                    b'\n' => "\\n",
                    b'\x0b' => "\\u000b",
                    b'\x0c' => "\\f",
                    b'\r' => "\\r",
                    b'\x0e' => "\\u000e",
                    b'\x0f' => "\\u000f",
                    b'\x10' => "\\u0010",
                    b'\x11' => "\\u0011",
                    b'\x12' => "\\u0012",
                    b'\x13' => "\\u0013",
                    b'\x14' => "\\u0014",
                    b'\x15' => "\\u0015",
                    b'\x16' => "\\u0016",
                    b'\x17' => "\\u0017",
                    b'\x18' => "\\u0018",
                    b'\x19' => "\\u0019",
                    b'\x1a' => "\\u001a",
                    b'\x1b' => "\\u001b",
                    b'\x1c' => "\\u001c",
                    b'\x1d' => "\\u001d",
                    b'\x1e' => "\\u001e",
                    b'\x1f' => "\\u001f",
                    b'\x7f' => "\\u007f",
                    _ => {
                        continue;
                    }
                };

                if start < i {
                    f.write_str(&self.0.as_ref()[start..i])?;
                }

                f.write_str(escaped)?;

                start = i + 1;
            }

            if start != self.0.as_ref().len() {
                f.write_str(&self.0.as_ref()[start..])?;
            }

            Ok(())
        }
    }