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use std::io;
use error::Result;
use token::Sentence;
pub trait WriteSentence {
fn write_sentence(&mut self, sentence: &Sentence) -> Result<()>;
}
pub struct Writer<W> {
write: W,
first: bool,
}
impl<W: io::Write> Writer<W> {
pub fn new(write: W) -> Writer<W> {
Writer {
write: write,
first: true,
}
}
pub fn get_ref(&self) -> &W {
&self.write
}
}
impl<W: io::Write> WriteSentence for Writer<W> {
fn write_sentence(&mut self, sentence: &Sentence) -> Result<()> {
if self.first {
self.first = false;
write!(self.write, "{}", sentence)?
} else {
write!(self.write, "\n\n{}", sentence)?
}
Ok(())
}
}
pub struct PartitioningWriter<W>
where
W: WriteSentence,
{
writers: Vec<W>,
fold: usize,
}
impl<W> PartitioningWriter<W>
where
W: WriteSentence,
{
pub fn new(writers: Vec<W>) -> PartitioningWriter<W> {
PartitioningWriter {
writers: writers,
fold: 0,
}
}
}
impl<W> WriteSentence for PartitioningWriter<W>
where
W: WriteSentence,
{
fn write_sentence(&mut self, sentence: &Sentence) -> Result<()> {
if self.fold == self.writers.len() {
self.fold = 0
}
self.writers[self.fold].write_sentence(sentence)?;
self.fold += 1;
Ok(())
}
}
#[cfg(test)]
mod tests {
use std::fs::File;
use std::io;
use std::io::Read;
use std::str;
use super::{WriteSentence, Writer};
use tests::TEST_SENTENCES;
static EMPTY: &str = "testdata/empty.conll";
fn read_file(filename: &str) -> io::Result<String> {
let mut f = File::open(filename)?;
let mut contents = String::new();
f.read_to_string(&mut contents)?;
Ok(contents)
}
#[test]
fn writer() {
let output = Vec::new();
let mut writer = Writer::new(Box::new(output));
for sentence in &*TEST_SENTENCES {
writer.write_sentence(&sentence).unwrap();
}
assert_eq!(
read_file(EMPTY).unwrap(),
str::from_utf8(writer.get_ref()).unwrap()
);
}
}