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use std::io;
use token::{Sentence, Token, EMPTY_TOKEN};
use error::Error;
pub trait ReadSentence {
fn read_sentence(&mut self) -> Result<Option<Sentence>, Error>;
}
pub struct Reader<R> {
read: R,
}
impl<R: io::BufRead> Reader<R> {
pub fn new(read: R) -> Reader<R> {
Reader { read: read }
}
pub fn sentences(self) -> Sentences<R> {
Sentences { reader: self }
}
}
impl<R: io::BufRead> IntoIterator for Reader<R> {
type Item = Result<Sentence, Error>;
type IntoIter = Sentences<R>;
fn into_iter(self) -> Self::IntoIter {
self.sentences()
}
}
impl<R: io::BufRead> ReadSentence for Reader<R> {
fn read_sentence(&mut self) -> Result<Option<Sentence>, Error> {
let mut line = String::new();
let mut tokens = Vec::new();
loop {
line.clear();
if try!(self.read.read_line(&mut line)) == 0 {
if tokens.is_empty() {
return Ok(None);
}
return Ok(Some(Sentence::new(tokens)));
}
if line.trim().is_empty() {
if tokens.is_empty() {
continue;
}
return Ok(Some(Sentence::new(tokens)));
}
let mut iter = line.trim().split_terminator('\t');
try!(parse_numeric_field(iter.next()));
let mut token = Token::new();
token.set_form(parse_string_field(iter.next()));
token.set_lemma(parse_string_field(iter.next()));
token.set_cpos(parse_string_field(iter.next()));
token.set_pos(parse_string_field(iter.next()));
token.set_features(parse_string_field(iter.next()));
token.set_head(try!(parse_numeric_field(iter.next())));
token.set_head_rel(parse_string_field(iter.next()));
token.set_p_head(try!(parse_numeric_field(iter.next())));
token.set_p_head_rel(parse_string_field(iter.next()));
tokens.push(token);
}
}
}
pub struct Sentences<R> {
reader: Reader<R>,
}
impl<R: io::BufRead> Iterator for Sentences<R> {
type Item = Result<Sentence, Error>;
fn next(&mut self) -> Option<Result<Sentence, Error>> {
match self.reader.read_sentence() {
Ok(None) => None,
Ok(Some(sent)) => Some(Ok(sent)),
Err(e) => Some(Err(e)),
}
}
}
fn parse_string_field(field: Option<&str>) -> Option<String> {
field.and_then(|s| {
if s == EMPTY_TOKEN {
None
} else {
Some(s.to_string())
}
})
}
fn parse_numeric_field(field: Option<&str>) -> Result<Option<usize>, Error> {
match field {
None => Ok(None),
Some(s) => {
if s == EMPTY_TOKEN {
return Ok(None);
} else {
Ok(Some(try!(s.parse())))
}
}
}
}