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//! This module contains a list of primitives to help to modify a [`Table`].
//!
//! [`Table`]: crate::Table
use papergrid::{
records::{Records, RecordsMut},
width::CfgWidthFunction,
Entity,
};
use crate::{CellOption, Table};
/// A formatting function of particular cells on a [`Table`].
///
/// [`Table`]: crate::Table
#[derive(Debug)]
pub struct Format<F> {
f: F,
}
impl Format<()> {
/// This function creates a new [`Format`] instance, so
/// it can be used as a grid setting.
///
/// # Example
///
/// ```
/// use tabled::{Table, format::Format, object::Rows, Modify};
///
/// let data = vec![
/// (0, "Grodno", true),
/// (1, "Minsk", true),
/// (2, "Hamburg", false),
/// (3, "Brest", true),
/// ];
///
/// let table = Table::new(&data)
/// .with(Modify::new(Rows::new(1..)).with(Format::new(|s| format!(": {} :", s))))
/// .to_string();
///
/// assert_eq!(table, "+-------+-------------+-----------+\n\
/// | i32 | &str | bool |\n\
/// +-------+-------------+-----------+\n\
/// | : 0 : | : Grodno : | : true : |\n\
/// +-------+-------------+-----------+\n\
/// | : 1 : | : Minsk : | : true : |\n\
/// +-------+-------------+-----------+\n\
/// | : 2 : | : Hamburg : | : false : |\n\
/// +-------+-------------+-----------+\n\
/// | : 3 : | : Brest : | : true : |\n\
/// +-------+-------------+-----------+");
/// ```
///
pub fn new<F>(f: F) -> Format<F>
where
F: FnMut(&str) -> String,
{
Format { f }
}
/// This function creates a new [`FormatWithIndex`], so
/// it can be used as a grid setting.
///
/// It's different from [`Format::new`] as it also provides a row and column index.
///
/// # Example
///
/// ```
/// use tabled::{Table, format::Format, object::Rows, Modify};
///
/// let data = vec![
/// (0, "Grodno", true),
/// (1, "Minsk", true),
/// (2, "Hamburg", false),
/// (3, "Brest", true),
/// ];
///
/// let table = Table::new(&data)
/// .with(Modify::new(Rows::single(0)).with(Format::with_index(|_, (_, column)| column.to_string())))
/// .to_string();
///
/// assert_eq!(table, "+---+---------+-------+\n\
/// | 0 | 1 | 2 |\n\
/// +---+---------+-------+\n\
/// | 0 | Grodno | true |\n\
/// +---+---------+-------+\n\
/// | 1 | Minsk | true |\n\
/// +---+---------+-------+\n\
/// | 2 | Hamburg | false |\n\
/// +---+---------+-------+\n\
/// | 3 | Brest | true |\n\
/// +---+---------+-------+");
/// ```
pub fn with_index<F>(f: F) -> FormatWithIndex<F>
where
F: FnMut(&str, (usize, usize)) -> String,
{
FormatWithIndex::new(f)
}
/// Multiline a helper function for changing multiline content of cell.
/// Using this formatting applied for all rows not to a string as a whole.
///
/// ```rust,no_run
/// use tabled::{Table, format::Format, object::Segment, Modify};
///
/// let data: Vec<&'static str> = Vec::new();
/// let table = Table::new(&data)
/// .with(Modify::new(Segment::all()).with(Format::multiline(|s| format!("{}", s))))
/// .to_string();
/// ```
pub fn multiline<F>(f: F) -> Format<impl Fn(&str) -> String>
where
F: Fn(&str) -> String,
{
let closure = move |s: &str| {
let mut v = Vec::new();
for line in s.lines() {
v.push(f(line));
}
v.join("\n")
};
Format::new(closure)
}
}
impl<F, R> CellOption<R> for Format<F>
where
F: FnMut(&str) -> String,
R: Records + RecordsMut<String>,
{
fn change_cell(&mut self, table: &mut Table<R>, entity: Entity) {
let width_fn = CfgWidthFunction::from_cfg(table.get_config());
let (count_rows, count_cols) = table.shape();
for pos in entity.iter(count_rows, count_cols) {
let records = table.get_records();
let content = records.get_text(pos);
let content = (self.f)(content);
table.get_records_mut().set(pos, content, &width_fn);
}
table.destroy_width_cache();
table.destroy_height_cache();
}
}
/// [`FormatWithIndex`] is like a [`Format`] an abstraction over a function you can use against a cell.
///
/// It differerent from [`Format`] that it provides a row and column index.
#[derive(Debug)]
pub struct FormatWithIndex<F> {
f: F,
}
impl<F> FormatWithIndex<F>
where
F: FnMut(&str, (usize, usize)) -> String,
{
fn new(f: F) -> Self {
Self { f }
}
}
impl<F, R> CellOption<R> for FormatWithIndex<F>
where
F: FnMut(&str, (usize, usize)) -> String,
R: Records + RecordsMut<String>,
{
fn change_cell(&mut self, table: &mut Table<R>, entity: Entity) {
let width_fn = CfgWidthFunction::from_cfg(table.get_config());
let (count_rows, count_cols) = table.shape();
for pos in entity.iter(count_rows, count_cols) {
let records = table.get_records();
let content = records.get_text(pos);
let content = (self.f)(content, pos);
table.get_records_mut().set(pos, content, &width_fn);
}
table.destroy_width_cache();
table.destroy_height_cache();
}
}
impl<F, R> CellOption<R> for F
where
F: FnMut(&str) -> String,
R: Records + RecordsMut<String>,
{
fn change_cell(&mut self, table: &mut Table<R>, entity: Entity) {
Format::new(self).change_cell(table, entity);
}
}
impl<R> CellOption<R> for String
where
R: Records + RecordsMut<String>,
{
fn change_cell(&mut self, table: &mut Table<R>, entity: Entity) {
let width_fn = CfgWidthFunction::from_cfg(table.get_config());
let (count_rows, count_cols) = table.shape();
for pos in entity.iter(count_rows, count_cols) {
let text = self.clone();
table.get_records_mut().set(pos, text, &width_fn);
}
table.destroy_width_cache();
table.destroy_height_cache();
}
}