textgridde_rs/

textgrid.rs

use std::{
    fmt::{self, Debug, Display, Formatter},
    fs::{self, File},
    io::{Read, Result, Write},
    path::PathBuf,
};

use derive_more::Constructor;
use getset::{Getters, MutGetters, Setters};

use crate::{interval::Tier as IntervalTier, parse_textgrid, point::Tier as PointTier};

/// Represents a tier in a `TextGrid`.
#[derive(Clone, Debug)]
pub enum Tier {
    IntervalTier(IntervalTier),
    PointTier(PointTier),
}

#[allow(dead_code)]
impl Tier {
    /// Unwraps a `Tier` into an `IntervalTier`.
    ///
    /// # Returns
    ///
    /// Returns the `IntervalTier` if the `Tier` is an `IntervalTier`, otherwise None.
    const fn get_interval_tier(&self) -> Option<&IntervalTier> {
        match self {
            Self::IntervalTier(interval_tier) => Some(interval_tier),
            Self::PointTier(_) => None,
        }
    }

    /// Unwraps a `Tier` into a `PointTier`.
    ///
    /// # Returns
    ///
    /// Returns the `PointTier` if the `Tier` is a `PointTier`, otherwise None.
    const fn get_point_tier(&self) -> Option<&PointTier> {
        match self {
            Self::PointTier(point_tier) => Some(point_tier),
            Self::IntervalTier(_) => None,
        }
    }
}

impl Default for Tier {
    fn default() -> Self {
        Self::IntervalTier(IntervalTier::default())
    }
}

impl Display for Tier {
    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
        match self {
            Self::IntervalTier(interval_tier) => write!(f, "{interval_tier}"),
            Self::PointTier(point_tier) => write!(f, "{point_tier}"),
        }
    }
}

/// Represents the output format for writing the `TextGrid` to a file.
#[derive(Copy, Clone)]
pub enum OutputFormat {
    Long,
    Short,
}

#[derive(Clone, Constructor, Debug, Default, Getters, MutGetters, Setters)]
/// Represents a `TextGrid`, which is a data structure used in the linguistic research program Praat
/// to annotate speech data. It can support either
pub struct TextGrid {
    #[getset(get = "pub")]
    xmin: f64,
    #[getset(get = "pub")]
    xmax: f64,
    #[getset(get = "pub", get_mut = "pub")]
    tiers: Vec<Tier>,
    #[getset(get = "pub", set = "pub")]
    name: String,
}

impl TextGrid {
    /// Returns the number of tiers in the `TextGrid`.
    #[must_use]
    pub fn get_size(&self) -> usize {
        self.tiers.len()
    }

    /// Sets the xmin time value of the whole `TextGrid` in seconds.
    ///
    /// # Arguments
    ///
    /// * `xmin` - The new xmin value.
    /// * `warn` - If Some(true), displays a warning if any tier has an xmin lesser than `xmin`.
    pub fn set_xmin<W: Into<Option<bool>>>(&mut self, xmin: f64, warn: W) {
        if xmin > self.xmax {
            if warn.into().unwrap_or_default() {
                eprintln!("Warning: xmin cannot be greater than xmax. Setting to xmax.");
            }
            self.xmin = self.xmax;
            return;
        } else if xmin < 0.0 {
            if warn.into().unwrap_or_default() {
                eprintln!("Warning: xmin cannot be less than 0.0. Setting to 0.0.");
            }
            self.xmin = 0.0;
            return;
        }

        if warn.into().unwrap_or_default() {
            for tier in &self.tiers {
                match tier {
                    Tier::IntervalTier(interval_tier) => {
                        if *interval_tier.xmin() < xmin {
                            eprintln!(
                                "Warning: Tier `{}` has a minimum point of {} but the TextGrid has an xmin of {}",
                                interval_tier.name(), interval_tier.xmin(), xmin
                            );
                        }
                    }
                    Tier::PointTier(point_tier) => {
                        if *point_tier.xmin() < xmin {
                            eprintln!(
                                "Warning: Tier `{}` has a minimum point of {} but the TextGrid has an xmin of {}",
                                point_tier.name(), point_tier.xmin(), xmin
                            );
                        }
                    }
                }
            }
        }

        self.xmin = xmin;
    }

    /// Sets the xmax time value of the whole `TextGrid` in seconds.
    ///
    /// # Arguments
    ///
    /// * `xmax` - The new xmax value.
    /// * `warn` - If Some(true), displays a warning if any tier has an xmax greater than `xmax`.
    pub fn set_xmax<W: Into<Option<bool>>>(&mut self, xmax: f64, warn: W) {
        if xmax < self.xmin {
            if warn.into().unwrap_or_default() {
                eprintln!("Warning: xmax cannot be less than xmin. Setting to xmin.");
            }
            self.xmax = self.xmin;
            return;
        } else if xmax < 0.0 {
            if warn.into().unwrap_or_default() {
                eprintln!("Warning: xmax cannot be less than 0.0. Setting to 0.0.");
            }
            self.xmax = 0.0;
            return;
        }

        if warn.into().unwrap_or_default() {
            for tier in &self.tiers {
                match tier {
                    Tier::IntervalTier(interval_tier) => {
                        if *interval_tier.xmax() > xmax {
                            eprintln!(
                                "Warning: Tier `{}` has a maximum point of {} but the TextGrid has an xmax of {}",
                                interval_tier.name(), interval_tier.xmax(), xmax
                            );
                        }
                    }
                    Tier::PointTier(point_tier) => {
                        if *point_tier.xmax() > xmax {
                            eprintln!(
                                "Warning: Tier `{}` has a maximum point of {} but the TextGrid has an xmax of {}",
                                point_tier.name(), point_tier.xmax(), xmax
                            );
                        }
                    }
                }
            }
        }

        self.xmax = xmax;
    }

    /// Pushes a new, user-made tier to the `TextGrid`.
    ///
    /// # Arguments
    ///
    /// * `tier` - The tier to be added.
    /// * `warn` - If Some(true), displays a warning if the tier has a minimum or maximum point
    ///            that is outside the range of the `TextGrid`.
    pub fn push_tier<W: Into<Option<bool>> + Copy>(&mut self, mut tier: Tier, warn: W) {
        let name = match &tier {
            Tier::IntervalTier(interval_tier) => interval_tier.name(),
            Tier::PointTier(point_tier) => point_tier.name(),
        };

        let mut increment = 0;
        let mut new_name = name.to_string();
        while self.get_tier(&new_name).is_some() {
            increment += 1;
            new_name = format!("{name}{increment}");
        }
        if increment > 0 && warn.into().unwrap_or_default() {
            eprintln!("Warning: Tier name `{name}` already exists. Renaming to `{new_name}`");
        }

        if warn.into().unwrap_or_default() {
            match tier {
                Tier::IntervalTier(ref mut interval_tier) => {
                    interval_tier.set_name(new_name);

                    if *interval_tier.xmin() < self.xmin {
                        eprintln!(
                            "Warning: Tier `{}` has a minimum point of {} but the TextGrid has an xmin of {}",
                            interval_tier.name(), interval_tier.xmin(), self.xmin
                        );
                    }
                    if *interval_tier.xmax() > self.xmax {
                        eprintln!(
                            "Warning: Tier `{}` has a maximum point of {} but the TextGrid has an xmax of {}",
                            interval_tier.name(), interval_tier.xmax(), self.xmax
                        );
                    }
                }
                Tier::PointTier(ref mut point_tier) => {
                    point_tier.set_name(new_name);

                    if *point_tier.xmin() < self.xmin {
                        eprintln!(
                            "Warning: Tier `{}` has a minimum point of {} but the TextGrid has an xmin of {}",
                            point_tier.name(), point_tier.xmin(), self.xmin
                        );
                    }
                    if *point_tier.xmax() > self.xmax {
                        eprintln!(
                            "Warning: Tier `{}` has a maximum point of {} but the TextGrid has an xmax of {}",
                            point_tier.name(), point_tier.xmax(), self.xmax
                        );
                    }
                }
            }
        }

        self.tiers.push(tier);
    }

    /// Gets a tier using it's name.
    ///
    /// # Arguments
    ///
    /// * `name` - The name of the tier to get.
    ///
    /// # Returns
    ///
    /// Returns the tier if it exists, otherwise None.
    #[must_use]
    pub fn get_tier(&self, name: &str) -> Option<&Tier> {
        self.tiers.iter().find(|tier| match tier {
            Tier::IntervalTier(interval_tier) => interval_tier.name() == name,
            Tier::PointTier(point_tier) => point_tier.name() == name,
        })
    }

    /// Deletes a tier using it's name.
    ///
    /// # Arguments
    ///
    /// * `name` - The name of the tier to delete.
    /// * `warn` - If true, displays a warning if the tier does not exist.
    pub fn delete_tier<W: Into<Option<bool>> + Copy>(&mut self, name: &str, warn: W) {
        let index = self.tiers.iter().position(|tier| match tier {
            Tier::IntervalTier(interval_tier) => interval_tier.name() == name,
            Tier::PointTier(point_tier) => point_tier.name() == name,
        });

        if let Some(index) = index {
            self.tiers.remove(index);
        } else if warn.into().unwrap_or_default() {
            eprintln!("Warning: Tier `{name}` does not exist therefore cannot be deleted.");
        }
    }

    /// Writes the `TextGrid` to a file or folder in the specified format.
    ///
    /// If given a folder path, the `TextGrid` will be written to a file in the folder with the same name as the `TextGrid`'s name field.
    ///
    /// Long `TextGrid`s are the typical format, while short
    /// `TextGrid`s are readable by Praat and do not include
    /// extraneous data.
    ///
    /// # Arguments
    ///
    /// * `path` - The path to the file.
    /// * `format` - The output format.
    ///
    /// # Errors
    ///
    /// Returns an error if there was a problem creating or writing to the file.
    pub fn write(&self, path: PathBuf, format: OutputFormat) -> Result<()> {
        let mut file = if path.extension().is_none() || path.is_dir() {
            fs::create_dir_all(path.clone())?;

            let mut path = path;
            path.push(format!("{}.TextGrid", self.name));

            File::create(path)?
        } else {
            let mut parent_path = path.clone();

            if parent_path.pop() {
                fs::create_dir_all(parent_path)?;
            };

            File::create(path)?
        };

        let textgrid_data = match format {
            OutputFormat::Long => self.format_as_long(),
            OutputFormat::Short => self.format_as_short(),
        };

        file.write_all(textgrid_data.join("\n").as_bytes())?;

        Ok(())
    }

    /// Outputs a String vector containing the `TextGrid` to a file in the long format.
    ///
    /// # Returns
    ///
    /// A vector of strings containing the `TextGrid` in the long format.
    fn format_as_long(&self) -> Vec<String> {
        let mut out_strings: Vec<String> = vec![
            "File type = \"ooTextFile\"".into(),
            "Object class = \"TextGrid\"".into(),
            String::new(),
            format!("xmin = {}", self.xmin),
            format!("xmax = {}", self.xmax),
            "tiers? <exists>".into(),
            format!("size = {}", self.tiers.len()),
            "item []:".into(),
        ];

        for (tier_index, tier) in self.tiers.iter().enumerate() {
            match tier {
                Tier::IntervalTier(interval_tier) => {
                    out_strings.push(format!("\titem [{}]:", tier_index + 1));
                    out_strings.push("\t\tclass = \"IntervalTier\"".into());
                    out_strings.push(format!("\t\tname = \"{}\"", interval_tier.name()));
                    out_strings.push(format!("\t\txmin = {}", interval_tier.xmin()));
                    out_strings.push(format!("\t\txmax = {}", interval_tier.xmax()));
                    out_strings.push(format!(
                        "\t\tintervals: size = {}",
                        interval_tier.get_size()
                    ));

                    for (interval_index, interval) in interval_tier.intervals().iter().enumerate() {
                        out_strings.push(format!("\t\tintervals [{}]:", interval_index + 1));
                        out_strings.push(format!("\t\t\txmin = {}", interval.xmin()));
                        out_strings.push(format!("\t\t\txmax = {}", interval.xmax()));
                        out_strings.push(format!("\t\t\ttext = \"{}\"", interval.text()));
                    }
                }
                Tier::PointTier(point_tier) => {
                    out_strings.push(format!("\titem [{}]:", tier_index + 1));
                    out_strings.push("\t\tclass = \"TextTier\"".into());
                    out_strings.push(format!("\t\tname = \"{}\"", point_tier.name()));
                    out_strings.push(format!("\t\txmin = {}", point_tier.xmin()));
                    out_strings.push(format!("\t\txmax = {}", point_tier.xmax()));
                    out_strings.push(format!("\t\tpoints: size = {}", point_tier.get_size()));

                    for (point_index, point) in point_tier.points().iter().enumerate() {
                        out_strings.push(format!("\t\tpoints [{}]:", point_index + 1));
                        out_strings.push(format!("\t\t\tnumber = {}", point.number()));
                        out_strings.push(format!("\t\t\tmark = \"{}\"", point.mark()));
                    }
                }
            }
        }

        out_strings
    }

    /// Outputs a String vector containing the `TextGrid` to a file in the short format.
    ///
    /// # Returns
    ///
    /// A vector of strings containing the `TextGrid` in the short format.
    fn format_as_short(&self) -> Vec<String> {
        let mut out_strings: Vec<String> = vec![
            "\"ooTextFile\"".into(),
            "\"TextGrid\"".into(),
            String::new(),
            self.xmin.to_string(),
            self.xmax.to_string(),
            "<exists>".into(),
            self.tiers.len().to_string(),
        ];

        for tier in &self.tiers {
            match tier {
                Tier::IntervalTier(interval_tier) => {
                    out_strings.push("\"IntervalTier\"".into());
                    out_strings.push(format!("\"{}\"", interval_tier.name()));
                    out_strings.push(interval_tier.xmin().to_string());
                    out_strings.push(interval_tier.xmax().to_string());
                    out_strings.push(interval_tier.get_size().to_string());

                    for interval in interval_tier.intervals() {
                        out_strings.push(interval.xmin().to_string());
                        out_strings.push(interval.xmax().to_string());
                        out_strings.push(format!("\"{}\"", interval.text()));
                    }
                }
                Tier::PointTier(point_tier) => {
                    out_strings.push("\"TextTier\"".into());
                    out_strings.push(format!("\"{}\"", point_tier.name()));
                    out_strings.push(point_tier.xmin().to_string());
                    out_strings.push(point_tier.xmax().to_string());
                    out_strings.push(point_tier.get_size().to_string());

                    for point in point_tier.points() {
                        out_strings.push(point.number().to_string());
                        out_strings.push(format!("\"{}\"", point.mark()));
                    }
                }
            }
        }

        out_strings
    }

    /// Checks the `TextGrid` for overlapping intervals or duplicate points.
    ///
    /// # Returns
    ///
    /// Returns Some([`tier_name`, (`index1`, `index2`)]) if an overlapping interval or point is found, otherwise None.
    #[must_use]
    pub fn check_overlaps(&self) -> Option<Vec<(String, (u64, u64))>> {
        let mut overlaps: Vec<(String, (u64, u64))> = Vec::new();

        for tier in &self.tiers {
            match tier {
                Tier::IntervalTier(interval_tier) => {
                    if let Some(interval_overlaps) = interval_tier.check_overlaps() {
                        overlaps.append(
                            &mut interval_overlaps
                                .into_iter()
                                .map(|overlap| (interval_tier.name().into(), overlap))
                                .collect(),
                        );
                    }
                }
                Tier::PointTier(point_tier) => {
                    if let Some(point_overlaps) = point_tier.check_overlaps() {
                        overlaps.append(
                            &mut point_overlaps
                                .into_iter()
                                .map(|overlap| (point_tier.name().into(), overlap))
                                .collect(),
                        );
                    }
                }
            }
        }

        if overlaps.is_empty() {
            None
        } else {
            Some(overlaps)
        }
    }

    /// Calls `fix_overlaps` on all `IntervalTier`s in the `TextGrid`.
    ///
    /// # Arguments
    ///
    /// * `prefer_first` - If true, the first interval's `xmax` will be raised or lowered to the
    ///                     new interval's `xmin` in the case of a gap or overlap. If false, the
    ///                     second interval's `xmin` will be raised or lowered to the first interval's.
    pub fn fix_boundaries<P: Into<Option<bool>> + Copy>(&mut self, prefer_first: P) {
        for tier in &mut self.tiers {
            match tier {
                Tier::IntervalTier(interval_tier) => {
                    interval_tier.fix_boundaries(prefer_first);
                }
                Tier::PointTier(_) => {}
            }
        }
    }

    /// Calls `fill_gaps` on all interval tiers in the `TextGrid`.
    ///
    /// # Arguments
    ///
    /// * `text` - The text to fill the gaps with.
    pub fn fill_gaps(&mut self, text: &str) {
        for tier in &mut self.tiers {
            match tier {
                Tier::IntervalTier(interval_tier) => {
                    interval_tier.fill_gaps(text);
                }
                Tier::PointTier(_) => {}
            }
        }
    }
}

impl Display for TextGrid {
    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
        write!(
            f,
            "TextGrid {}:
                xmin = {}
                xmax = {}
                tier count = {}",
            self.name,
            self.xmin,
            self.xmax,
            self.tiers.len(),
        )
    }
}

/// `TextGrid::try_from` implementation for `PathBuf`.
impl TryFrom<PathBuf> for TextGrid {
    type Error = std::io::Error;

    fn try_from(path: PathBuf) -> Result<Self> {
        parse_textgrid(path, None)
    }
}

/// `TextGrid::try_from` implementation for `&str`.
impl TryFrom<&str> for TextGrid {
    type Error = std::io::Error;

    fn try_from(textgrid: &str) -> Result<Self> {
        parse_textgrid(textgrid, None)
    }
}

/// `TextGrid::try_from` implementation for `String`.
impl TryFrom<String> for TextGrid {
    type Error = std::io::Error;

    fn try_from(textgrid: String) -> Result<Self> {
        parse_textgrid(textgrid, None)
    }
}

impl TryFrom<Vec<String>> for TextGrid {
    type Error = std::io::Error;

    fn try_from(textgrid: Vec<String>) -> Result<Self> {
        parse_textgrid(textgrid, None)
    }
}

impl TryFrom<Box<dyn Read>> for TextGrid {
    type Error = std::io::Error;

    fn try_from(textgrid: Box<dyn Read>) -> Result<Self> {
        parse_textgrid(textgrid, None)
    }
}

impl TryFrom<File> for TextGrid {
    type Error = std::io::Error;

    fn try_from(textgrid: File) -> Result<Self> {
        parse_textgrid(textgrid, None)
    }
}

/// Tests for the `TextGrid` struct.
#[cfg(test)]
#[allow(clippy::float_cmp)]
mod test_textgrid {
    use std::env;

    use crate::get_file_content;
    use crate::input::Source;
    use crate::interval::{Interval, Tier as IntervalTier};
    use crate::point::{Point, Tier as PointTier};
    use crate::textgrid::{TextGrid, Tier};

    mod set_xmin {
        use crate::textgrid::TextGrid;

        #[test]
        fn normal() {
            let mut textgrid = TextGrid::new(0.0, 10.0, Vec::new(), "test".to_string());

            textgrid.set_xmin(1.0, false);

            assert_eq!(*textgrid.xmin(), 1.0);
        }

        #[test]
        fn negative_with_warn() {
            let mut textgrid = TextGrid::new(0.0, 10.0, Vec::new(), "test".to_string());

            textgrid.set_xmin(-1.0, false);

            assert_eq!(*textgrid.xmin(), 0.0);
        }

        #[test]
        fn more_than_xmax() {
            let mut textgrid = TextGrid::new(5.0, 10.0, Vec::new(), "test".to_string());

            textgrid.set_xmin(11.0, false);

            assert_eq!(*textgrid.xmin(), 10.0);
        }
    }

    mod set_xmax {
        use crate::textgrid::TextGrid;

        #[test]
        fn normal() {
            let mut textgrid = TextGrid::new(0.0, 10.0, Vec::new(), "test".to_string());

            textgrid.set_xmax(11.0, false);

            assert_eq!(*textgrid.xmax(), 11.0);
        }

        #[test]
        fn negative() {
            let mut textgrid = TextGrid::new(0.0, 10.0, Vec::new(), "test".to_string());

            textgrid.set_xmax(-1.0, false);

            assert_eq!(*textgrid.xmax(), 0.0);
        }

        #[test]
        fn less_than_xmin() {
            let mut textgrid = TextGrid::new(5.0, 10.0, Vec::new(), "test".to_string());

            textgrid.set_xmax(1.0, false);

            assert_eq!(*textgrid.xmax(), 5.0);
        }
    }

    #[test]
    fn push_tier() {
        let mut textgrid = TextGrid::new(0.0, 10.0, Vec::new(), "test".to_string());
        let interval_tier = IntervalTier::new("test".to_string(), 0.0, 10.0, vec![]);
        let point_tier = PointTier::new("test".to_string(), 0.0, 10.0, vec![]);

        textgrid.push_tier(Tier::IntervalTier(interval_tier), false);
        textgrid.push_tier(Tier::PointTier(point_tier), false);

        assert_eq!(textgrid.get_size(), 2);
    }

    #[test]
    fn from_pathbuf() {
        let cwd = env::current_dir();
        assert!(cwd.is_ok());

        let textgrid = TextGrid::try_from(cwd.unwrap().join("example/long.TextGrid")).unwrap();

        assert_eq!(textgrid.xmax(), &2.3);
    }

    #[test]
    fn format_as_long() {
        let cwd = env::current_dir();
        assert!(cwd.is_ok());

        let long_out = get_file_content(
            Source::String(
                cwd.unwrap()
                    .join("example/long.TextGrid")
                    .to_str()
                    .unwrap()
                    .into(),
            ),
            None,
        )
        .unwrap();

        let mut textgrid = TextGrid::new(0.0, 2.3, Vec::new(), "test".to_string());

        textgrid.push_tier(
            Tier::IntervalTier(IntervalTier::new(
                "John".to_string(),
                0.0,
                2.3,
                vec![Interval::new(0.0, 2.3, "daisy bell".to_string())],
            )),
            false,
        );

        textgrid.push_tier(
            Tier::IntervalTier(IntervalTier::new(
                "Kelly".to_string(),
                0.0,
                2.3,
                vec![Interval::new(0.0, 2.3, String::new())],
            )),
            false,
        );

        textgrid.push_tier(
            Tier::PointTier(PointTier::new(
                "Bell".to_string(),
                0.0,
                2.3,
                vec![Point::new(1.0, "give me your answer do".to_string())],
            )),
            false,
        );

        let format = textgrid.format_as_long();

        for (i, line) in long_out.0.iter().enumerate() {
            assert_eq!(
                line.replace('\r', "").replace(" ! comment test", ""),
                format[i]
            );
        }
    }

    #[test]
    fn format_as_short() {
        let cwd = env::current_dir();
        assert!(cwd.is_ok());

        let short_out = get_file_content(
            Source::String(
                cwd.unwrap()
                    .join("example/short.TextGrid")
                    .to_str()
                    .unwrap()
                    .into(),
            ),
            None,
        )
        .unwrap();

        let mut textgrid = TextGrid::new(0.0, 2.3, Vec::new(), "test".to_string());

        textgrid.push_tier(
            Tier::IntervalTier(IntervalTier::new(
                "John".to_string(),
                0.0,
                2.3,
                vec![Interval::new(0.0, 2.3, "daisy bell".to_string())],
            )),
            false,
        );

        textgrid.push_tier(
            Tier::IntervalTier(IntervalTier::new(
                "Kelly".to_string(),
                0.0,
                2.3,
                vec![Interval::new(0.0, 2.3, String::new())],
            )),
            false,
        );

        textgrid.push_tier(
            Tier::PointTier(PointTier::new(
                "Bell".to_string(),
                0.0,
                2.3,
                vec![Point::new(1.0, "give me your answer do".to_string())],
            )),
            false,
        );

        let format = textgrid.format_as_short();

        for (i, line) in short_out.0.iter().enumerate() {
            assert_eq!(
                line.replace('\r', "").replace(" ! comment test", ""),
                format[i]
            );
        }
    }
}

#[cfg(test)]
mod test_tier {
    use crate::interval::Tier as IntervalTier;
    use crate::point::Tier as PointTier;
    use crate::textgrid::Tier;

    #[test]
    fn get_interval_tier() {
        let interval_tier = IntervalTier::new("test".to_string(), 0.0, 10.0, vec![]);
        let tier = Tier::IntervalTier(interval_tier);

        assert!(tier.get_interval_tier().is_some());
    }

    #[test]
    fn get_point_tier() {
        let point_tier = PointTier::new("test".to_string(), 0.0, 10.0, vec![]);
        let tier = Tier::PointTier(point_tier);

        assert!(tier.get_point_tier().is_some());
    }

    #[test]
    fn default() {
        let tier = Tier::default();

        assert!(matches!(tier, Tier::IntervalTier(_)));
    }

    #[test]
    fn to_string() {
        let interval_tier = IntervalTier::new("test".to_string(), 0.0, 10.0, vec![]);
        let point_tier = PointTier::new("test".to_string(), 0.0, 10.0, vec![]);

        assert_eq!(
            interval_tier.to_string(),
            "IntervalTier test:\n                xmin:  0\n                xmax:  10\n                interval count: 0"
        );
        assert_eq!(
            point_tier.to_string(),
            "PointTier test:\n                xmin:  0\n                xmax:  10\n                point count: 0"
        );
    }
}