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use std::fmt;
use std::fmt::Write;
use regex::Regex;
use crate::bracket::br;
use crate::chars::{LF, SP, TB, VO};
use crate::enums::Brac;
lazy_static! {
static ref LINEFEED: Regex = Regex::new(r"\n").unwrap();
static ref COMMA: Regex = Regex::new(r",").unwrap();
}
pub trait Concat: IntoIterator {
fn join(self, delim: &str) -> String where Self: Sized,
Self::IntoIter: Iterator<Item=Self::Item>,
Self::Item: fmt::Display
{
let mut iter = self.into_iter();
match iter.next() {
None => String::new(),
Some(first) => {
let (lb, _) = iter.size_hint();
let mut phrase = String::with_capacity(delim.len() * lb);
write!(&mut phrase, "{}", first).unwrap();
iter.for_each(|elt| { write!(&mut phrase, "{}{}", delim, elt).unwrap(); });
phrase
}
}
}
fn concat_lines(self, delim: &str, level: u8) -> String where Self: Sized,
Self::IntoIter: Iterator<Item=Self::Item>,
Self::Item: fmt::Display
{
let ind = if level > 0 { SP.repeat((level as usize) << 1) } else { String::new() };
let de = format!("{}{}{}{}", delim, LF, ind, TB);
let joined = self.into_iter().join(&de);
return format!("{}{}{}{}", ind, TB, joined, delim);
}
fn concat_lines_edged(self, delim: &str, level: u8) -> String where Self: Sized,
Self::IntoIter: Iterator<Item=Self::Item>,
Self::Item: fmt::Display
{
let ind = if level > 0 { SP.repeat((level as usize) << 1) } else { String::new() };
let de = format!("{}{}{}{}", delim, LF, ind, TB);
let joined = self.into_iter().join(&de);
return format!("{}{}{}{}{}{}{}", LF, ind, TB, joined, delim, LF, ind);
}
fn contingent_lines(self, delim: &str, level: u8, brac: &Brac) -> String where Self: Sized,
Self::IntoIter: Iterator<Item=Self::Item>,
Self::Item: fmt::Display
{
let iter = self.into_iter();
let edged = match brac { Brac::Nan => false, _ => true };
let joined: String = if LINEFEED.is_match(delim) {
let de = if COMMA.is_match(delim) { delim.replace(LF, VO) } else { String::new() };
if edged {
iter.concat_lines_edged(&de, level)
} else {
iter.concat_lines(&de, level)
}
} else {
iter.join(delim)
};
return br(&joined, brac);
}
}
impl<I> Concat for I where I: IntoIterator {}
pub fn join<I>(vec: I, delim: &str) -> String where I: IntoIterator,
I: Sized,
I::IntoIter: Iterator<Item=I::Item>,
I::Item: fmt::Display
{ vec.join(delim) }
pub fn concat_lines<I>(vec: I, delim: &str, level: u8) -> String where I: IntoIterator,
I: Sized,
I::IntoIter: Iterator<Item=I::Item>,
I::Item: fmt::Display
{ vec.concat_lines(delim, level) }
pub fn concat_lines_edged<I>(vec: I, delim: &str, level: u8) -> String where I: IntoIterator,
I: Sized,
I::IntoIter: Iterator<Item=I::Item>,
I::Item: fmt::Display
{ vec.concat_lines_edged(delim, level) }
pub fn contingent_lines<I>(vec: I, delim: &str, level: u8, brac: &Brac) -> String where I: IntoIterator,
I: Sized,
I::IntoIter: Iterator<Item=I::Item>,
I::Item: fmt::Display
{ vec.contingent_lines(delim, level, brac) }
#[cfg(test)]
mod tests {
use veho::vector::Mappers;
use crate::concat::{Concat, contingent_lines};
use crate::enums::Brac;
#[test]
fn test_crostab_simplified() {
let years = vec!["2004", "1984", "1964"].mapper(String::from);
println!("years = {}", Concat::join(years.iter(), ", "));
println!("years = [{}]", (&years).concat_lines(", ", 0));
println!("years.len = {}", years.len());
let words = vec!["foo", "bar", "zen"];
println!("words = [{}]", (&words).concat_lines_edged(", ", 0));
println!("words.len = {}", words.len());
}
#[test]
fn test_contingent_lines() {
let years = vec!["2004", "1984", "1964"].mapper(String::from);
println!("contingent_lines = {}", (&years).contingent_lines(",\n", 0, &Brac::Brk));
println!("years.len = {}", years.len());
println!("contingent_lines = {}", (&years).contingent_lines("\n", 0, &Brac::Nan));
println!("years.len = {}", years.len());
println!("contingent_lines = {}", contingent_lines(&years, ", ", 0, &Brac::Brk));
println!("years.len = {}", years.len());
}
#[test]
fn test_regex() {
use regex::Regex;
let linefeed = Regex::new(r"\n").unwrap();
let comma = Regex::new(r",").unwrap();
let candidates = vec!["shakespeare, william", "william shakespeare", "alpha\nbeta", "alpha beta"];
candidates.iterate(|x| {
println!("[{}] contains LINEFEED ({}) contains COMMA ({})", x, linefeed.is_match(x), comma.is_match(x));
});
}
}