parse a TDB2 file

This commit is contained in:
Dustin J. Mitchell 2018-11-09 19:34:55 -05:00
commit d1c09f2561
5 changed files with 874 additions and 0 deletions

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9
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[package]
name = "rask"
version = "0.1.0"
authors = ["Dustin J. Mitchell <dustin@mozilla.com>"]
[dependencies]
clap = "2.32"
console = "0.6.2"
indicatif = "0.9.0"

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src/main.rs Normal file
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mod nibbler;
use std::str;
use std::io::{stdin, BufRead, Result, Error, ErrorKind};
use nibbler::Nibbler;
/// Decode the given byte slice into a string using Taskwarrior JSON's escaping The slice is
/// assumed to be ASCII; unicode escapes within it will be expanded.
// TODO: return Cow
fn json_decode(value: &[u8]) -> String {
let length = value.len();
let mut rv = String::with_capacity(length);
let mut pos = 0;
while pos < length {
let v = value[pos];
if v == b'\\' {
pos += 1;
if pos == length {
rv.push(v as char);
break;
}
let v = value[pos];
match v {
b'"' | b'\\' | b'/' => rv.push(v as char),
b'b' => rv.push(8 as char),
b'f' => rv.push(12 as char),
b'n' => rv.push('\n' as char),
b'r' => rv.push('\r' as char),
b't' => rv.push('\t' as char),
b'u' => panic!("omg please no"),
_ => {
rv.push(b'\\' as char);
rv.push(v as char);
}
}
} else {
rv.push(v as char)
}
pos += 1;
}
rv
}
fn decode(value: String) -> String {
if let Some(_) = value.find('&') {
return value.replace("&open;", "[").replace("&close;", "]");
}
value
}
fn parse_ff4(line: &str) -> Result<()> {
let mut nib = Nibbler::new(line.as_bytes());
println!("{}", line);
if !nib.skip(b'[') {
return Err(Error::new(ErrorKind::Other, "bad line"));
}
if let Some(line) = nib.get_until(b']') {
let mut nib = Nibbler::new(line);
while !nib.depleted() {
if let Some(name) = nib.get_until(b':') {
if !nib.skip(b':') {
return Err(Error::new(ErrorKind::Other, "bad line"));
}
if let Some(value) = nib.get_quoted(b'"') {
let value = json_decode(value);
let value = decode(value);
println!("{}={}", str::from_utf8(name).unwrap(), value);
} else {
return Err(Error::new(ErrorKind::Other, "bad line"));
}
nib.skip(b' ');
} else {
return Err(Error::new(ErrorKind::Other, "bad line"));
}
}
} else {
return Err(Error::new(ErrorKind::Other, "bad line"));
}
if !nib.skip(b']') {
return Err(Error::new(ErrorKind::Other, "bad line"));
}
if !nib.depleted() {
return Err(Error::new(ErrorKind::Other, "bad line"));
}
Ok(())
}
fn parse_tdb2() -> Result<()> {
let input = stdin();
for line in input.lock().lines() {
parse_ff4(&line?)?;
}
Ok(())
}
fn main() {
parse_tdb2().unwrap();
println!("Done");
}

292
src/nibbler.rs Normal file
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pub struct Nibbler<'a> {
input: &'a [u8],
cursor: usize,
}
impl<'a> Nibbler<'a> {
pub fn new(input: &'a [u8]) -> Self {
Nibbler {
input: input,
cursor: 0,
}
}
pub fn get_until(&mut self, c: u8) -> Option<&'a [u8]> {
if self.cursor >= self.input.len() {
return None;
}
let mut i = self.cursor;
while i < self.input.len() {
if self.input[i] == c {
let rv = &self.input[self.cursor..i];
self.cursor = i;
return Some(rv);
}
i += 1;
}
let rv = &self.input[self.cursor..];
self.cursor = self.input.len();
Some(rv)
}
// TODO: get_until_str
// TODO: get_until_one_of
// TODO: get_until_ws
pub fn get_until_eos(&mut self) -> Option<&'a [u8]> {
if self.cursor >= self.input.len() {
return None;
}
let rv = &self.input[self.cursor..];
self.cursor = self.input.len();
return Some(rv);
}
// TODO: get_n
pub fn get_quoted(&mut self, c: u8) -> Option<&'a [u8]> {
let length = self.input.len();
if self.cursor >= length || self.input[self.cursor] != c {
return None;
}
let start = self.cursor + 1;
let mut i = start;
while i < length {
while i < length && self.input[i] != c {
i += 1
}
if i == length {
// unclosed quote
return None;
}
if i == start {
return Some(&self.input[i..i]);
}
if self.input[i - 1] == b'\\' {
// work backward looking for escaped backslashes
let mut j = i - 2;
let mut quote = true;
while j >= start && self.input[j] == b'\\' {
quote = !quote;
j -= 1;
}
if quote {
i += 1;
continue;
}
}
// none of the above matched, so we are at the end
self.cursor = i + 1;
return Some(&self.input[start..i]);
}
unreachable!();
}
// TODO: (missing funcs)
pub fn skip_n(&mut self, n: usize) -> bool {
let length = self.input.len();
if self.cursor < length && self.cursor + n <= length {
self.cursor += n;
return true;
}
return false;
}
pub fn skip(&mut self, c: u8) -> bool {
if self.cursor < self.input.len() && self.input[self.cursor] == c {
self.cursor += 1;
return true;
}
false
}
// TODO: skip_all_one_of
// TODO: skip_ws
pub fn next(&mut self) -> Option<u8> {
if self.cursor >= self.input.len() {
return None;
}
let rv = self.input[self.cursor];
self.cursor += 1;
return Some(rv);
}
// TODO: next_n
// TODO: cursor
// TODO: save
// TODO: restore
pub fn depleted(&self) -> bool {
self.cursor >= self.input.len()
}
}
#[cfg(test)]
mod test {
use super::Nibbler;
#[test]
fn test_get_until() {
let s = b"abc:123";
let mut nib = Nibbler::new(s);
assert_eq!(nib.get_until(b':'), Some(&s[..3]));
}
#[test]
fn test_get_until_empty() {
let s = b"abc:123";
let mut nib = Nibbler::new(s);
assert_eq!(nib.get_until(b'a'), Some(&s[..0]));
}
#[test]
fn test_get_until_not_found() {
let s = b"abc:123";
let mut nib = Nibbler::new(s);
assert_eq!(nib.get_until(b'/'), Some(&s[..]));
}
#[test]
fn test_get_until_eos() {
let s = b"abc:123";
let mut nib = Nibbler::new(s);
assert_eq!(nib.get_until_eos(), Some(&s[..]));
}
#[test]
fn test_get_quoted() {
let s = b"'abcd'efg";
let mut nib = Nibbler::new(s);
assert_eq!(nib.get_quoted(b'\''), Some(&s[1..5]));
assert_eq!(nib.next(), Some(b'e'));
}
#[test]
fn test_get_quoted_unopened() {
let s = b"abcd'efg";
let mut nib = Nibbler::new(s);
assert_eq!(nib.get_quoted(b'\''), None);
assert_eq!(nib.next(), Some(b'a')); // nothing consumed
}
#[test]
fn test_get_quoted_unclosed() {
let s = b"'abcdefg";
let mut nib = Nibbler::new(s);
assert_eq!(nib.get_quoted(b'\''), None);
assert_eq!(nib.next(), Some(b'\'')); // nothing consumed
}
#[test]
fn test_get_quoted_escaped() {
let s = b"'abc\\'de'fg";
let mut nib = Nibbler::new(s);
assert_eq!(nib.get_quoted(b'\''), Some(&s[1..8]));
assert_eq!(nib.next(), Some(b'f'));
}
#[test]
fn test_get_quoted_double_escaped() {
let s = b"'abc\\\\'de'fg";
let mut nib = Nibbler::new(s);
assert_eq!(nib.get_quoted(b'\''), Some(&s[1..6]));
assert_eq!(nib.next(), Some(b'd'));
}
#[test]
fn test_get_quoted_triple_escaped() {
let s = b"'abc\\\\\\'de'fg";
let mut nib = Nibbler::new(s);
assert_eq!(nib.get_quoted(b'\''), Some(&s[1..10]));
assert_eq!(nib.next(), Some(b'f'));
}
#[test]
fn test_get_quoted_all_escapes() {
let s = b"'\\\\\\'\\\\'fg";
let mut nib = Nibbler::new(s);
assert_eq!(nib.get_quoted(b'\''), Some(&s[1..7]));
assert_eq!(nib.next(), Some(b'f'));
}
#[test]
fn test_skip_n() {
let s = b"abc:123";
let mut nib = Nibbler::new(s);
assert!(nib.skip_n(3));
assert_eq!(nib.get_until_eos(), Some(&s[3..]));
}
#[test]
fn test_skip_n_too_long() {
let s = b"abc:123";
let mut nib = Nibbler::new(s);
assert!(!nib.skip_n(33));
// nothing is consumed
assert_eq!(nib.get_until_eos(), Some(&s[..]));
}
#[test]
fn test_skip_n_exact_eos() {
let s = b"abc:123";
let mut nib = Nibbler::new(s);
assert!(nib.skip_n(7));
assert_eq!(nib.get_until_eos(), None);
}
#[test]
fn test_skip_match() {
let s = b"foo";
let mut nib = Nibbler::new(s);
assert!(nib.skip(b'f'));
assert_eq!(nib.get_until_eos(), Some(&s[1..]));
}
#[test]
fn test_skip_no_match() {
let s = b"foo";
let mut nib = Nibbler::new(s);
assert!(!nib.skip(b'x'));
assert_eq!(nib.get_until_eos(), Some(&s[..]));
}
#[test]
fn test_skip_eos() {
let s = b"foo";
let mut nib = Nibbler::new(s);
assert!(nib.skip_n(3));
assert!(!nib.skip(b'x'));
}
#[test]
fn test_next() {
let s = b"foo";
let mut nib = Nibbler::new(s);
assert_eq!(nib.next(), Some(b'f'));
assert_eq!(nib.next(), Some(b'o'));
assert_eq!(nib.next(), Some(b'o'));
assert_eq!(nib.next(), None);
assert_eq!(nib.next(), None);
}
#[test]
fn test_depleted() {
let s = b"xy";
let mut nib = Nibbler::new(s);
assert!(!nib.depleted());
assert_eq!(nib.next(), Some(b'x'));
assert!(!nib.depleted());
assert_eq!(nib.next(), Some(b'y'));
assert!(nib.depleted());
}
}