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ltsv.rs
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ltsv.rs
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/*!
Library for reading/writing Labeled Tab-Separated Values
# Example
~~~~~~~~~~~~~~~~~~~~~~
extern mod ltsv;
use ltsv::LTSVWriter;
use ltsv::LTSVReader;
fn main() {
let infile = io::file_reader(&Path("path/fo/file.tlsv")).get();
for infile.read_ltsv().each |record| {
for record.each |&(label, value)| {
io::println(fmt!("%s: %s", *label, *value));
}
}
}
~~~~~~~~~~~~~~~~~~~~~~
*/
#[link(name = "ltsv",
vers = "0.2",
uuid = "E0EA0251-E165-4612-919F-38E89ACECBE9",
url = "https://github.com/tychosci/rust-ltsv/")];
#[comment = "Library for reading/writing Labeled Tab-Separated Values"];
#[license = "MIT license"];
#[crate_type = "lib"];
use core::container::Map;
use core::hashmap::linear::LinearMap;
use core::io::WriterUtil;
pub type Record = LinearMap<~str, ~str>;
enum ParseType {
FieldLabel,
FieldValue,
Field,
Record,
Ltsv
}
#[deriving(Eq)]
enum ParseDelimiter {
EOF, TAB, NL, MISC
}
enum ParseResult<T> {
ParseError(~str),
ParseOk(ParseType, ParseDelimiter, T)
}
pub trait LTSVWriter {
fn write_ltsv(&self, ltsv: &[Record]);
fn write_ltsv_record(&self, record: &Record);
}
pub trait LTSVReader {
fn read_ltsv(&self) -> ~[Record];
fn each_ltsv_record(&self, f: &fn(&Record) -> bool);
fn each_ltsv_field(&self, f: &fn(&(~str, ~str)) -> bool);
}
impl<T: io::Writer> LTSVWriter for T {
fn write_ltsv(&self, ltsv: &[Record]) {
for ltsv.each |record| {
self.write_ltsv_record(record);
self.write_char('\n');
}
}
fn write_ltsv_record(&self, record: &Record) {
let mut is_first = true;
for record.each |&(k, v)| {
if !is_first { self.write_char('\t'); }
self.write_str(fmt!("%s:%s", *k, *v));
if is_first { is_first = false; }
}
}
}
impl<T: io::Reader> LTSVReader for T {
fn read_ltsv(&self) -> ~[Record] {
let mut parser = LTSVParser::new(self);
match parser.parse_ltsv() {
ParseError(reason) => fail!(reason),
ParseOk(_, _, records) => records
}
}
fn each_ltsv_record(&self, f: &fn(&Record) -> bool) {
let mut parser = LTSVParser::new(self);
while !parser.eof() {
match parser.parse_record() {
ParseError(reason) => fail!(reason),
ParseOk(_, _, record) => if !f(&record) { break; }
}
}
}
fn each_ltsv_field(&self, f: &fn(&(~str, ~str)) -> bool) {
let mut parser = LTSVParser::new(self);
while !parser.eof() {
match parser.parse_field() {
ParseError(reason) => fail!(reason),
ParseOk(_, _, field) => if !f(&field) { break; }
}
}
}
}
struct LTSVParser<'self, T> {
priv rd: &'self T,
priv cur: @mut int
}
pub impl<'self, T: io::Reader> LTSVParser<'self, T> {
fn new(rd: &'self T) -> LTSVParser<'self, T> {
let cur = @mut rd.read_byte();
LTSVParser { rd: rd, cur: cur }
}
fn eof(&self) -> bool {
*self.cur == -1
}
fn parse_ltsv(&self) -> ParseResult<~[Record]> {
let mut records = ~[];
loop {
match self.parse_record() {
ParseError(reason) => {
return ParseError(reason);
}
ParseOk(_, EOF, record) => {
records.push(record);
break;
}
ParseOk(_, _, record) => {
records.push(record);
}
}
}
ParseOk(Ltsv, EOF, records)
}
fn parse_record(&self) -> ParseResult<Record> {
let mut record = LinearMap::new();
loop {
match self.parse_field() {
ParseError(reason) => {
return ParseError(reason);
}
ParseOk(_, TAB, (label, value)) => {
record.insert(label, value);
}
ParseOk(_, delim, (label, value)) => {
record.insert(label, value);
return ParseOk(Record, delim, record);
}
}
}
}
fn parse_field(&self) -> ParseResult<(~str, ~str)> {
self.skip_whitespaces();
let label = match self.parse_field_label() {
ParseError(reason) => return ParseError(reason),
ParseOk(_, _, label) => { self.bump(); label }
};
match self.parse_field_value() {
ParseError(reason) => {
ParseError(reason)
}
ParseOk(_, delim, value) => {
self.bump();
// avoid skipping whitespaces in the middle of parsing record.
if delim != TAB { self.skip_whitespaces(); }
// re-check EOF
let delim = if self.eof() { EOF } else { delim };
ParseOk(Field, delim, (label, value))
}
}
}
priv fn parse_field_label(&self) -> ParseResult<~str> {
let mut bytes = ~[];
loop {
match *self.cur {
0x30..0x39 | 0x41..0x5a | 0x61..0x7a | 0x5f |
0x2e | 0x2d => bytes.push(*self.cur as u8),
0x3a if bytes.len() == 0 => return ParseError(~"label is empty"),
0x3a => return ParseOk(FieldLabel, MISC, str::from_bytes(bytes)),
-1 => return ParseError(~"EOF while parsing field label"),
_ => return ParseError(~"invalid byte detected")
}
self.bump();
}
}
priv fn parse_field_value(&self) -> ParseResult<~str> {
let mut bytes = ~[];
loop {
match *self.cur {
0x01..0x08 | 0x0b | 0x0c |
0x0e..0xff => bytes.push(*self.cur as u8),
0x0d => return self.consume_forward_LF(str::from_bytes(bytes)),
0x0a => return ParseOk(FieldValue, NL, str::from_bytes(bytes)),
0x09 => return ParseOk(FieldValue, TAB, str::from_bytes(bytes)),
-1 => return ParseOk(FieldValue, EOF, str::from_bytes(bytes)),
_ => return ParseError(~"invalid byte detected")
}
self.bump();
}
}
priv fn consume_forward_LF(&self, rv: ~str) -> ParseResult<~str> {
self.bump();
if *self.cur != 0x0a {
ParseError(~"CR detected, but not provided with LF")
} else {
ParseOk(FieldValue, NL, rv)
}
}
priv fn bump(&self) {
if !self.eof() {
*self.cur = self.rd.read_byte();
}
}
priv fn skip_whitespaces(&self) {
while char::is_whitespace(*self.cur as char) {
self.bump();
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use core::io::WriterUtil;
fn mk_record_string() -> ~str {
do io::with_str_writer |wr| {
// genzairyou
wr.write_str(fmt!("%s:%s\t", "tofu", "豆"));
wr.write_str(fmt!("%s:%s\t", "kamaboko", "魚"));
wr.write_str(fmt!("%s:%s\n", "sukonbu", "海藻"));
// konomi
wr.write_str(fmt!("%s:%s\t", "tofu", "好き"));
wr.write_str(fmt!("%s:%s\t", "kamaboko", "普通"));
wr.write_str(fmt!("%s:%s\n", "sukonbu", "苦手"));
}
}
#[test]
fn test_parse_simple() {
let records = io::with_str_reader(~"a:1\tb:2", |rd| rd.read_ltsv());
assert_eq!(records.len(), 1);
}
#[test]
fn test_parse_full() {
let s = mk_record_string();
let records = io::with_str_reader(s, |rd| rd.read_ltsv());
assert_eq!(records.len(), 2);
}
#[test]
fn test_parse_ltsv_trailing_nl_and_write() {
let s = mk_record_string();
let records_1 = io::with_str_reader(s, |rd| rd.read_ltsv());
let s2 = io::with_str_writer(|wr| wr.write_ltsv(records_1));
let records_2 = io::with_str_reader(s2, |rd| rd.read_ltsv());
assert_eq!(records_1, records_2);
}
#[test]
fn test_each_read_each_record() {
let s = mk_record_string();
let ks = [~"tofu", ~"kamaboko", ~"sukonbu"];
let vs = [~"豆", ~"魚", ~"海藻", ~"好き", ~"普通", ~"苦手"];
do io::with_str_reader(s) |rd| {
for rd.each_ltsv_record |record| {
for record.each |&(k, v)| {
assert!(ks.contains(k));
assert!(vs.contains(v));
}
}
}
}
}